A nanodiamond with an embedded nitrogen-vacancy(NV)center is one of the experimental systems that can be coherently manipulated within current technologies.Entanglement between NV center electron spin and mechanical r...A nanodiamond with an embedded nitrogen-vacancy(NV)center is one of the experimental systems that can be coherently manipulated within current technologies.Entanglement between NV center electron spin and mechanical rotation of the nanodiamond plays a fundamental role in building a quantum network connecting these microscopic and mesoscopic degrees of motions.Here we present a protocol to asymptotically prepare a highly entangled state of the total quantum angular momentum and electron spin by adiabatically boosting the external magnetic field.展开更多
Photocatalysis is an environmentally friendly and energy-saving technology, which can effectively remove persistent dangerous pollutants in the water. Pitifully, optical absorption capacity and carrier separation have...Photocatalysis is an environmentally friendly and energy-saving technology, which can effectively remove persistent dangerous pollutants in the water. Pitifully, optical absorption capacity and carrier separation have become major bottlenecks for marvelous photocatalytic performance of photocatalysts.Herein, to address these issue, Nanodiamonds/yolk-shell ZnFe_(2)O_(4) spheres(NDs/ZFO) nanocomposites were successfully constructed via a facile two-step of solvothermal and calcination methods. The synthesized optimal NDs/ZFO-10 nanocomposite exhibits superior photocatalytic degradation activity of antibiotic under visible light, approximately 85% of the total tetracycline(TC) is degraded, and this photocatalyst shows durable cycling stability. This stems from two aspects of refinement: improvement of light absorption capacity and photo-induced charges migration and separation. In addition, the NDs/ZFO composite photocatalyst features excellent magnetic recovery capability, facilitating the recovery of photocatalyst in industry. This study opens a new chapter in the combination of NDs with magnetic materials, and deepens the understanding of the application of NDs modified composite photocatalysts.展开更多
In order to investigate the effect of nanodiamond(ND) on the mechanical properties of dental composite resins,bisphenol-A-glycidyl dimethacrylate(Bis-GMA),triethylene glycol dimethacrylate(TEGDMA),barium glass(BG) pow...In order to investigate the effect of nanodiamond(ND) on the mechanical properties of dental composite resins,bisphenol-A-glycidyl dimethacrylate(Bis-GMA),triethylene glycol dimethacrylate(TEGDMA),barium glass(BG) powder,DL-camphoroquinone(CQ) and dimethylaminoethylmethacrylate(DMAEMA) were mixed as the matrix for the experiments.NDs of three diameters(100 nm,220 nm,500 nm) modified with 3-(trimethoxysilyl)propyl methacrylate(γ-MPS) were added to the mixture separately in 0.2% to get test samples.The flexural strength and elastic modulus of these samples and the mixture without ND(as the reference group,RG) were characterized with standard specification tests.Results reveal that the mechanical properties and elastic modulus of resins containing 220 nm ND(R-220) and 500 nm ND(R-500) were significantly different from those of RG.R-500 had the highest flexural strength and elastic modulus(by average data),and all of its five specimens were found to have mean flexural strength values greater than the minimum value(80MPa) prescribed by ISO 4049:2000.Different sizes of diamonds have different effects on mechanical properties of dental composite resins,and the performances of 220 nm and 500 nm diamonds are better than that of 100 nm diamond.展开更多
Carbon materials have been playing important roles in advancing energyrelated technologies and offering great promise to addressing the rising global energy demands and environmental issues.Nanodiamonds,an exciting cl...Carbon materials have been playing important roles in advancing energyrelated technologies and offering great promise to addressing the rising global energy demands and environmental issues.Nanodiamonds,an exciting class of carbon materials,with excellent mechanical,chemical,electronic,and optical properties,have great potentials in energy-related applications.In this contribution,we summarized some of the recent progress on nanodiamonds for energy storage,conversion,and other related applications in sustainable energy research.We discussed the promising opportunities and outlooks for nanodiamonds in energy-related fields.展开更多
Annealing nanodiamonds(ND) at high temperatures up to 1700 ℃ is a common method to synthesize carbon onions. The transformation from NDs to carbon onions is particularly interesting because of carbon onions' pote...Annealing nanodiamonds(ND) at high temperatures up to 1700 ℃ is a common method to synthesize carbon onions. The transformation from NDs to carbon onions is particularly interesting because of carbon onions' potential in the field of tribology and their application in ultra-charge/discharge devices. In this paper, a novel surface-enhanced Raman scattering technique that involves coating the sample with nanoscopic gold particles is proposed to characterize the NDs after different annealing treatments. Conventional Raman and surfaceenhanced Raman spectra were obtained, and the changes of peak parameters as the function of annealing temperature were evaluated. It was found that the widths of the D and the G peaks decreased with increasing annealing temperature, reflecting an improved order in the sp^2-hybridized carbon during the transformation from NDs to carbon onions. After annealing at 1700 ℃, the sp^2?carbon was highly ordered, indicating desirable electrical conductivity and lubricity. With increasing annealing temperature, the D peak showed a blue shift of almost30 cm^(-1), while the G peak merely shifted by 5 cm^(-1). For annealing temperatures above 1100 ℃, an increase of intensity ratio ID/IGwas observed. Compared to the uncoated area, red shifts of 0.5-2 cm^(-1) and of 5-9 cm^(-1) for the G and D peaks, respectively, were detected for the gold-coated area, which was due to the coupling of the plasmons and the phonons of the samples.展开更多
Nanodiamond is a new material which has the dual properties of diamond and nanomaterial.The dual properties have contributed to its wide applications in many industrial sectors.This paper briefly reviews the developme...Nanodiamond is a new material which has the dual properties of diamond and nanomaterial.The dual properties have contributed to its wide applications in many industrial sectors.This paper briefly reviews the development of nanodiamond,describes its synthesis technology under dynamic high-temperature and high-pressure conditions,and introduces its properties as well as applications.Predictions are made about nanodiamond’ s potentially successful applications in the future.展开更多
Nanodiamonds have outstanding mechanical properties,chemical inertness,and biocompatibility,which give them potential in various applications.Current methods for preparing nanodiamonds often lead to products with impu...Nanodiamonds have outstanding mechanical properties,chemical inertness,and biocompatibility,which give them potential in various applications.Current methods for preparing nanodiamonds often lead to products with impurities and uneven morphologies.We report a two-step high-pressure high-temperature(HPHT) method to synthesize nanodiamonds using naphthalene as the precursor without metal catalysts.The grain size of the diamonds decreases with increasing carbonization time(at constant pressure and temperature of 11.5 GPa and 700℃,respectively).This is discussed in terms of the different crystallinities of the carbon intermediates.The probability of secondary anvil cracking during the HPHT process is also reduced.These results indicate that the two-step method is efficient for synthesizing nanodiamonds,and that it is applicable to other organic precursors.展开更多
Nanodiamonds(NDs)have been widely explored for applications in drug delivery,optical bioimaging,sensors,quantum computing,and others.Room-temperature nanomanufacturing of NDs in open air using confined laser shock det...Nanodiamonds(NDs)have been widely explored for applications in drug delivery,optical bioimaging,sensors,quantum computing,and others.Room-temperature nanomanufacturing of NDs in open air using confined laser shock detonation(CLSD)emerges as a novel manufacturing strategy for ND fabrication.However,the fundamental process mechanism remains unclear.This work investigates the underlying mechanisms responsible for nanomanufacturing of NDs during CLSD with a focus on the laser-matter interaction,the role of the confining effect,and the graphite-to-diamond transition.Specifically,a first-principles model is integrated with a molecular dynamics simulation to describe the laser-induced thermo-hydrodynamic phenomena and the graphite-to-diamond phase transition during CLSD.The simulation results elucidate the confining effect in determining the material’s responses to laser irradiation in terms of the temporal and spatial evolutions of temperature,pressure,electron number density,and particle velocity.The integrated model demonstrates the capability of predicting the laser energy threshold for ND synthesis and the efficiency of ND nucleation under varying processing parameters.This research will provide significant insights into CLSD and advance this nanomanufacturing strategy for the fabrication of NDs and other high-temperature-high-pressure synthesized nanomaterials towards extensive applications.展开更多
Model test-systems for biochemical determination of glucose and cholesterol are designed by covalent coupling of enzymes to the surface of modified nanodiamonds (MND). In both cases after immobilization on MND the enz...Model test-systems for biochemical determination of glucose and cholesterol are designed by covalent coupling of enzymes to the surface of modified nanodiamonds (MND). In both cases after immobilization on MND the enzymes exhibit activity and catalyze the formation of a colored product in the chain of successive enzymatic reactions of oxidative azocoupling (Н2О2—4-aminoantipyrine—phenol). Produced MND-enzymes complexes: function in DI water and various buffers, over a wide range of temperature and pH, provide for the linear product yield over a broad concentration range of analyzed substances, make possible to test cholesterol and glucose in vitro many times, exhibit functional activity after long storage at + 4°C.展开更多
The protective effect of modified nanodiamonds (MND) under the action of cobalt and nickel ions on the skin of Guinea pigs was shown. At the action of chromium ions on the skin of animals, the protective effect of MND...The protective effect of modified nanodiamonds (MND) under the action of cobalt and nickel ions on the skin of Guinea pigs was shown. At the action of chromium ions on the skin of animals, the protective effect of MND was not found. The differences are related to different adsorption properties of MND to the investigated colored metal ions. It is shown in vitro that MND can adsorb ions of cobalt and nickel and don’t bind ions of chromium from aqueous medium. The perspectives using of MND as a new drug for the prevention allergic dermatitis caused by action of bivalent ions of metals are discussed.展开更多
A technology of mechanochemical treatment (MCT) is introduced to modify nanodiamond (ND) surface aiming to obtaining a stable suspension with well-dispersed ND particles in aqueous medium. ND investigated in this pape...A technology of mechanochemical treatment (MCT) is introduced to modify nanodiamond (ND) surface aiming to obtaining a stable suspension with well-dispersed ND particles in aqueous medium. ND investigated in this paper is a purified product of nanometer-sized diamond synthesized by explosive detonation. As obvious aggregation and sediment were observed when the sample was added into deionized water, it is crucial to conduct deaggregation and dispersion investigations. Amid a series of mechanical treatments, I.e. Grinding, stirring, ultrasonic and classification, some reagents are introduced to modify the newly created surface during aggregates comminution. For the co-effects of mechanical forces and surfactants, the mean size of particles was reduced and a stable system containing ND with narrow size distribution was prepared. Mechanism of surface reaction and modification are discussed, while AFM, Zetasizer3000HS, XRD, XPS and FTIR are utilized for the analysis. The functional chemical structure of ND particle surface and surface electrical property changed during the modification processes, and the dispersion character and stability of suspension can consequently be improved.展开更多
The effect of Chemical Mechanical Modification (CMM) and dispersants on the ζ potential of nanodiamond particles in aqueous system and the influence of the ultrasonic or shearing techniques on its size distribution w...The effect of Chemical Mechanical Modification (CMM) and dispersants on the ζ potential of nanodiamond particles in aqueous system and the influence of the ultrasonic or shearing techniques on its size distribution were studied CMM and the addition of dispersants AD 2 and AD 8 improve the stability of its suspension With ultrasonic time prolonged, the mean average size of nanodiamond decreases, while with the prolongation of shearing time, its mean size decreases first, then increases a little In the speed range used, the mean size decreases with the rising speed If the whole ultrasonic time kept constant, it is better to add the dispersants before展开更多
Onion-like carbon (OLC) was fabricated by annealing nanodiamond at 1000 ℃ for 2 hours in low vacuum (1 Pa). The OLC was characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTE...Onion-like carbon (OLC) was fabricated by annealing nanodiamond at 1000 ℃ for 2 hours in low vacuum (1 Pa). The OLC was characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and differential scanning calorimetry (DSC). The experimental results show that the OLC exhibits similarity to the original nanodiamond particles in shape. The size of the OLC is found to be approximately 5 nm. The transformation mechanism of the OLC from nanodiamond was discussed also.展开更多
Several factors affecting the ζ-potential of nanodiamonds were studied. The Chemical Mechanical Modification (CMM) of surface, different surfactants and its dosage, and inorganic ions on the ζ-potential of nanodiamo...Several factors affecting the ζ-potential of nanodiamonds were studied. The Chemical Mechanical Modification (CMM) of surface, different surfactants and its dosage, and inorganic ions on the ζ-potential of nanodiamond sample L were studied using ZETASIZER3000HS and Nexus470. Results show that the ζ-potential changes with its parameters of detonation synthesis and purification. Results also suggest that CMM and subsequent treatments employed can alter apparently the ζ-potential and that some anionic surfactants increase the absolute value of the ζ-potential in the alkaline surrounding.展开更多
The methods of chemical-mechanical treatments (CMT) were utilized for surface modification of nanodiamond in aqueous medium, and a considerably stable suspension system was thus obtained. The size of all the particles...The methods of chemical-mechanical treatments (CMT) were utilized for surface modification of nanodiamond in aqueous medium, and a considerably stable suspension system was thus obtained. The size of all the particles in the provided system was less than 100 nm with a narrow distribution and excellent stability, and no obvious change of particle crystal structure after the treatments was observed. The mechanism of the treatments was also discussed. The results show that, because of mechanical treatment effect, addition of ionic surfactants and inorganic regulators, the ζ-potential of nanodiamond shifts upwards during the treatments, and the composition of surface functional groups changes. Carboxyl and hydroxyl groups are intensified after the surface modification, which may contribute to the improvement of dispersion and stability. Meanwhile, the addition of non-ionic polymer can also benefit the suspension stability.展开更多
Well-dispersed nanodiamond(ND) aqueous suspensions in both acidic and alkaline environments is prepared by mechanochemical treatment. All the ND particles in the suspensions are smaller than 100nm in dimension with a ...Well-dispersed nanodiamond(ND) aqueous suspensions in both acidic and alkaline environments is prepared by mechanochemical treatment. All the ND particles in the suspensions are smaller than 100nm in dimension with a narrow size distribution, and no destabilization phenomena were detected in a duration of more than one year. Stable dispersion of ND in the media may attributed to the strong electrostatic repulsion between particles because of the adsorption of dispersants, while mechanical forces may strengthen this adsorption reaction. Good adaptability and applicability of the suspensions to the change of ND concentration and surrounding temperature are observed, and improved performances of ND diamonds are obtained when used in ultrafine polishing and composite plating.展开更多
The spread of diseases caused by bacterial adhesion and immobilization in public places constitutes a serious threat to public health.Prevention of bacteria spread by the construction of an antibacterial surface takes...The spread of diseases caused by bacterial adhesion and immobilization in public places constitutes a serious threat to public health.Prevention of bacteria spread by the construction of an antibacterial surface takes precedence over post-infection treatment.Herein,we demonstrate an effective antibacterial surface with strong wear resistance by constructing cationic engineered nanodiamonds(C-NDs).The C-NDs with positive surface potentials interact effectively with bacteria through electrostatic interactions,where the C-NDs act on the phospholipid bilayer and lead to bacterial membrane collapse and rupture through hydrogen bonding and residual surface oxygen-containing reactive groups.In this case,bactericidal rate of 99.99%and bacterial biofilm inhibition rate of more than 80%can be achieved with the C-NDs concentration of 1 mg/mL.In addition,the C-NDs show outstanding antibacterial stability,retaining over 87%of the antibacterial effect after stimulation by adverse environments of heat,acid,and external abrasion.Therefore,an antibacterial surface with high wear resistance obtained by integrating C-NDs with commercial plastics has been demonstrated.The antibacterial surface with a mass fraction of 1 wt.%C-NDs improved abrasion resistance by 3981 times,with 99%killing of adherent bacteria.This work provides an effective strategy for highly efficient antibacterial wear-resistant surface,showing great practical applications in public health environments.展开更多
The development of miniature devices has generated a large demand for dielectric polymers with high energy storage density,especially at high temperatures.First,poly(methyl methacrylate)(PMMA)-coated nanodiamond(ND)pa...The development of miniature devices has generated a large demand for dielectric polymers with high energy storage density,especially at high temperatures.First,poly(methyl methacrylate)(PMMA)-coated nanodiamond(ND)particles were incorporated into a polyimide(PI)substrate to fabricate ND-g-PMMA/PI(NPP)composites.We found for the first time that with a very low content(0.4 vol.%)of ND particles,NPP-0.4 composite material gave the dielectric constant of 4.4,which is 37.5%higher than that of the PI film.The maximum energy density of the NPP-0.4 composite film achieves 9.4 J cm^(-3)at room temperature,which is 54%higher than that of the PI film.Furthermore,we found that the NPP-0.2 composite reaches the highest energy density and discharge efficiency of 5.77 J cm^(-3)and 72.3%at 150℃,which are 104%and 51.3%higher than those of the PI film at 150℃.This result shows a much higher energy density than most previously published results for high-temperature polymer capacitors.This phenomenon can be explained by the simulation results using COMSOL in which the interface polarization of ND/PI composites reached their maximum value with ultralow ND contents(0.4 vol.%).This research shows great promise for polymer capacitors with relatively high energy density at high temperatures.展开更多
基金Project supported by the National Key Research and Development Program of China(Grant Nos.2021YFA0718302 and 2021YFA1402104)the National Natural Science Foundation of China(Grant No.12075310)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB28000000).
文摘A nanodiamond with an embedded nitrogen-vacancy(NV)center is one of the experimental systems that can be coherently manipulated within current technologies.Entanglement between NV center electron spin and mechanical rotation of the nanodiamond plays a fundamental role in building a quantum network connecting these microscopic and mesoscopic degrees of motions.Here we present a protocol to asymptotically prepare a highly entangled state of the total quantum angular momentum and electron spin by adiabatically boosting the external magnetic field.
基金the founding support from the National Natural Science Foundation of China(21906072 and 22006057)the Natural Science Foundation of Jiangsu Province(BK20190982)+2 种基金Henan Postdoctoral Foundation(202003013)“Doctor of Mass entrepreneurship and innovation” Project in Jiangsu ProvinceOpen Fund for Hebei Province Key Laboratory of Sustained Utilization & Development of Water Recourse(HSZYL2021003)。
文摘Photocatalysis is an environmentally friendly and energy-saving technology, which can effectively remove persistent dangerous pollutants in the water. Pitifully, optical absorption capacity and carrier separation have become major bottlenecks for marvelous photocatalytic performance of photocatalysts.Herein, to address these issue, Nanodiamonds/yolk-shell ZnFe_(2)O_(4) spheres(NDs/ZFO) nanocomposites were successfully constructed via a facile two-step of solvothermal and calcination methods. The synthesized optimal NDs/ZFO-10 nanocomposite exhibits superior photocatalytic degradation activity of antibiotic under visible light, approximately 85% of the total tetracycline(TC) is degraded, and this photocatalyst shows durable cycling stability. This stems from two aspects of refinement: improvement of light absorption capacity and photo-induced charges migration and separation. In addition, the NDs/ZFO composite photocatalyst features excellent magnetic recovery capability, facilitating the recovery of photocatalyst in industry. This study opens a new chapter in the combination of NDs with magnetic materials, and deepens the understanding of the application of NDs modified composite photocatalysts.
文摘In order to investigate the effect of nanodiamond(ND) on the mechanical properties of dental composite resins,bisphenol-A-glycidyl dimethacrylate(Bis-GMA),triethylene glycol dimethacrylate(TEGDMA),barium glass(BG) powder,DL-camphoroquinone(CQ) and dimethylaminoethylmethacrylate(DMAEMA) were mixed as the matrix for the experiments.NDs of three diameters(100 nm,220 nm,500 nm) modified with 3-(trimethoxysilyl)propyl methacrylate(γ-MPS) were added to the mixture separately in 0.2% to get test samples.The flexural strength and elastic modulus of these samples and the mixture without ND(as the reference group,RG) were characterized with standard specification tests.Results reveal that the mechanical properties and elastic modulus of resins containing 220 nm ND(R-220) and 500 nm ND(R-500) were significantly different from those of RG.R-500 had the highest flexural strength and elastic modulus(by average data),and all of its five specimens were found to have mean flexural strength values greater than the minimum value(80MPa) prescribed by ISO 4049:2000.Different sizes of diamonds have different effects on mechanical properties of dental composite resins,and the performances of 220 nm and 500 nm diamonds are better than that of 100 nm diamond.
基金We acknowledge the support from the Department of Energy,Office of Basic Energy Sciences,Division of Materials Sciences and Engineering,under contract DE‐AC02-76SF00515.
文摘Carbon materials have been playing important roles in advancing energyrelated technologies and offering great promise to addressing the rising global energy demands and environmental issues.Nanodiamonds,an exciting class of carbon materials,with excellent mechanical,chemical,electronic,and optical properties,have great potentials in energy-related applications.In this contribution,we summarized some of the recent progress on nanodiamonds for energy storage,conversion,and other related applications in sustainable energy research.We discussed the promising opportunities and outlooks for nanodiamonds in energy-related fields.
基金supported by National Natural Science Foundation of China (No. 51575389, 51761135106, 51511130074)National Key Research and Development Program of China (2016YFB1102203)State key laboratory of precision measuring technology and instruments (Pilt1705)
文摘Annealing nanodiamonds(ND) at high temperatures up to 1700 ℃ is a common method to synthesize carbon onions. The transformation from NDs to carbon onions is particularly interesting because of carbon onions' potential in the field of tribology and their application in ultra-charge/discharge devices. In this paper, a novel surface-enhanced Raman scattering technique that involves coating the sample with nanoscopic gold particles is proposed to characterize the NDs after different annealing treatments. Conventional Raman and surfaceenhanced Raman spectra were obtained, and the changes of peak parameters as the function of annealing temperature were evaluated. It was found that the widths of the D and the G peaks decreased with increasing annealing temperature, reflecting an improved order in the sp^2-hybridized carbon during the transformation from NDs to carbon onions. After annealing at 1700 ℃, the sp^2?carbon was highly ordered, indicating desirable electrical conductivity and lubricity. With increasing annealing temperature, the D peak showed a blue shift of almost30 cm^(-1), while the G peak merely shifted by 5 cm^(-1). For annealing temperatures above 1100 ℃, an increase of intensity ratio ID/IGwas observed. Compared to the uncoated area, red shifts of 0.5-2 cm^(-1) and of 5-9 cm^(-1) for the G and D peaks, respectively, were detected for the gold-coated area, which was due to the coupling of the plasmons and the phonons of the samples.
文摘Nanodiamond is a new material which has the dual properties of diamond and nanomaterial.The dual properties have contributed to its wide applications in many industrial sectors.This paper briefly reviews the development of nanodiamond,describes its synthesis technology under dynamic high-temperature and high-pressure conditions,and introduces its properties as well as applications.Predictions are made about nanodiamond’ s potentially successful applications in the future.
基金Project supported by the National Key R&D Program of China(Grant No.2018YFB0406500)the National Natural Science Foundation of China(Grant Nos.U1804155,U1604263,and 11804307)the China Postdoctoral Science Foundation(Grant Nos.2018M630830 and 2019T120631).
文摘Nanodiamonds have outstanding mechanical properties,chemical inertness,and biocompatibility,which give them potential in various applications.Current methods for preparing nanodiamonds often lead to products with impurities and uneven morphologies.We report a two-step high-pressure high-temperature(HPHT) method to synthesize nanodiamonds using naphthalene as the precursor without metal catalysts.The grain size of the diamonds decreases with increasing carbonization time(at constant pressure and temperature of 11.5 GPa and 700℃,respectively).This is discussed in terms of the different crystallinities of the carbon intermediates.The probability of secondary anvil cracking during the HPHT process is also reduced.These results indicate that the two-step method is efficient for synthesizing nanodiamonds,and that it is applicable to other organic precursors.
基金National Science Foundation(NSF)under award numbers CMMI-1826439 and CMMI-1825739。
文摘Nanodiamonds(NDs)have been widely explored for applications in drug delivery,optical bioimaging,sensors,quantum computing,and others.Room-temperature nanomanufacturing of NDs in open air using confined laser shock detonation(CLSD)emerges as a novel manufacturing strategy for ND fabrication.However,the fundamental process mechanism remains unclear.This work investigates the underlying mechanisms responsible for nanomanufacturing of NDs during CLSD with a focus on the laser-matter interaction,the role of the confining effect,and the graphite-to-diamond transition.Specifically,a first-principles model is integrated with a molecular dynamics simulation to describe the laser-induced thermo-hydrodynamic phenomena and the graphite-to-diamond phase transition during CLSD.The simulation results elucidate the confining effect in determining the material’s responses to laser irradiation in terms of the temporal and spatial evolutions of temperature,pressure,electron number density,and particle velocity.The integrated model demonstrates the capability of predicting the laser energy threshold for ND synthesis and the efficiency of ND nucleation under varying processing parameters.This research will provide significant insights into CLSD and advance this nanomanufacturing strategy for the fabrication of NDs and other high-temperature-high-pressure synthesized nanomaterials towards extensive applications.
文摘Model test-systems for biochemical determination of glucose and cholesterol are designed by covalent coupling of enzymes to the surface of modified nanodiamonds (MND). In both cases after immobilization on MND the enzymes exhibit activity and catalyze the formation of a colored product in the chain of successive enzymatic reactions of oxidative azocoupling (Н2О2—4-aminoantipyrine—phenol). Produced MND-enzymes complexes: function in DI water and various buffers, over a wide range of temperature and pH, provide for the linear product yield over a broad concentration range of analyzed substances, make possible to test cholesterol and glucose in vitro many times, exhibit functional activity after long storage at + 4°C.
文摘The protective effect of modified nanodiamonds (MND) under the action of cobalt and nickel ions on the skin of Guinea pigs was shown. At the action of chromium ions on the skin of animals, the protective effect of MND was not found. The differences are related to different adsorption properties of MND to the investigated colored metal ions. It is shown in vitro that MND can adsorb ions of cobalt and nickel and don’t bind ions of chromium from aqueous medium. The perspectives using of MND as a new drug for the prevention allergic dermatitis caused by action of bivalent ions of metals are discussed.
文摘A technology of mechanochemical treatment (MCT) is introduced to modify nanodiamond (ND) surface aiming to obtaining a stable suspension with well-dispersed ND particles in aqueous medium. ND investigated in this paper is a purified product of nanometer-sized diamond synthesized by explosive detonation. As obvious aggregation and sediment were observed when the sample was added into deionized water, it is crucial to conduct deaggregation and dispersion investigations. Amid a series of mechanical treatments, I.e. Grinding, stirring, ultrasonic and classification, some reagents are introduced to modify the newly created surface during aggregates comminution. For the co-effects of mechanical forces and surfactants, the mean size of particles was reduced and a stable system containing ND with narrow size distribution was prepared. Mechanism of surface reaction and modification are discussed, while AFM, Zetasizer3000HS, XRD, XPS and FTIR are utilized for the analysis. The functional chemical structure of ND particle surface and surface electrical property changed during the modification processes, and the dispersion character and stability of suspension can consequently be improved.
文摘The effect of Chemical Mechanical Modification (CMM) and dispersants on the ζ potential of nanodiamond particles in aqueous system and the influence of the ultrasonic or shearing techniques on its size distribution were studied CMM and the addition of dispersants AD 2 and AD 8 improve the stability of its suspension With ultrasonic time prolonged, the mean average size of nanodiamond decreases, while with the prolongation of shearing time, its mean size decreases first, then increases a little In the speed range used, the mean size decreases with the rising speed If the whole ultrasonic time kept constant, it is better to add the dispersants before
文摘Onion-like carbon (OLC) was fabricated by annealing nanodiamond at 1000 ℃ for 2 hours in low vacuum (1 Pa). The OLC was characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and differential scanning calorimetry (DSC). The experimental results show that the OLC exhibits similarity to the original nanodiamond particles in shape. The size of the OLC is found to be approximately 5 nm. The transformation mechanism of the OLC from nanodiamond was discussed also.
文摘Several factors affecting the ζ-potential of nanodiamonds were studied. The Chemical Mechanical Modification (CMM) of surface, different surfactants and its dosage, and inorganic ions on the ζ-potential of nanodiamond sample L were studied using ZETASIZER3000HS and Nexus470. Results show that the ζ-potential changes with its parameters of detonation synthesis and purification. Results also suggest that CMM and subsequent treatments employed can alter apparently the ζ-potential and that some anionic surfactants increase the absolute value of the ζ-potential in the alkaline surrounding.
文摘The methods of chemical-mechanical treatments (CMT) were utilized for surface modification of nanodiamond in aqueous medium, and a considerably stable suspension system was thus obtained. The size of all the particles in the provided system was less than 100 nm with a narrow distribution and excellent stability, and no obvious change of particle crystal structure after the treatments was observed. The mechanism of the treatments was also discussed. The results show that, because of mechanical treatment effect, addition of ionic surfactants and inorganic regulators, the ζ-potential of nanodiamond shifts upwards during the treatments, and the composition of surface functional groups changes. Carboxyl and hydroxyl groups are intensified after the surface modification, which may contribute to the improvement of dispersion and stability. Meanwhile, the addition of non-ionic polymer can also benefit the suspension stability.
基金the financial support of Jiangsu Provincial Natural Science Foundation of China （No. BK2006191） Jiangsu Provincial Foundation of Summit Talents in Six Trades （No. 06-D- 024）.
文摘Well-dispersed nanodiamond(ND) aqueous suspensions in both acidic and alkaline environments is prepared by mechanochemical treatment. All the ND particles in the suspensions are smaller than 100nm in dimension with a narrow size distribution, and no destabilization phenomena were detected in a duration of more than one year. Stable dispersion of ND in the media may attributed to the strong electrostatic repulsion between particles because of the adsorption of dispersants, while mechanical forces may strengthen this adsorption reaction. Good adaptability and applicability of the suspensions to the change of ND concentration and surrounding temperature are observed, and improved performances of ND diamonds are obtained when used in ultrafine polishing and composite plating.
基金The authors acknowledge the National Natural Science Foundation of China(Nos.12274378,62075198 and U21A2070)Outstanding Youth Foundation of Henan(No.222300420087)for financial support of this work.
文摘The spread of diseases caused by bacterial adhesion and immobilization in public places constitutes a serious threat to public health.Prevention of bacteria spread by the construction of an antibacterial surface takes precedence over post-infection treatment.Herein,we demonstrate an effective antibacterial surface with strong wear resistance by constructing cationic engineered nanodiamonds(C-NDs).The C-NDs with positive surface potentials interact effectively with bacteria through electrostatic interactions,where the C-NDs act on the phospholipid bilayer and lead to bacterial membrane collapse and rupture through hydrogen bonding and residual surface oxygen-containing reactive groups.In this case,bactericidal rate of 99.99%and bacterial biofilm inhibition rate of more than 80%can be achieved with the C-NDs concentration of 1 mg/mL.In addition,the C-NDs show outstanding antibacterial stability,retaining over 87%of the antibacterial effect after stimulation by adverse environments of heat,acid,and external abrasion.Therefore,an antibacterial surface with high wear resistance obtained by integrating C-NDs with commercial plastics has been demonstrated.The antibacterial surface with a mass fraction of 1 wt.%C-NDs improved abrasion resistance by 3981 times,with 99%killing of adherent bacteria.This work provides an effective strategy for highly efficient antibacterial wear-resistant surface,showing great practical applications in public health environments.
基金supported by the National Key Research&Development Project of China(Grant No.2021YFB3200303)the National Natural Science Foundation of China(Grant No.52172082)。
文摘The development of miniature devices has generated a large demand for dielectric polymers with high energy storage density,especially at high temperatures.First,poly(methyl methacrylate)(PMMA)-coated nanodiamond(ND)particles were incorporated into a polyimide(PI)substrate to fabricate ND-g-PMMA/PI(NPP)composites.We found for the first time that with a very low content(0.4 vol.%)of ND particles,NPP-0.4 composite material gave the dielectric constant of 4.4,which is 37.5%higher than that of the PI film.The maximum energy density of the NPP-0.4 composite film achieves 9.4 J cm^(-3)at room temperature,which is 54%higher than that of the PI film.Furthermore,we found that the NPP-0.2 composite reaches the highest energy density and discharge efficiency of 5.77 J cm^(-3)and 72.3%at 150℃,which are 104%and 51.3%higher than those of the PI film at 150℃.This result shows a much higher energy density than most previously published results for high-temperature polymer capacitors.This phenomenon can be explained by the simulation results using COMSOL in which the interface polarization of ND/PI composites reached their maximum value with ultralow ND contents(0.4 vol.%).This research shows great promise for polymer capacitors with relatively high energy density at high temperatures.
