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mRNA transcriptome profiling of human hepatocellular carcinoma cells HepG2 treated with Catharanthus roseus-silver nanoparticles
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作者 Nur Asna Azhar Siti Aishah Abu Bakar +1 位作者 Marimuthu Citartan Nor Hazwani Ahmad 《World Journal of Hepatology》 2023年第3期393-409,共17页
BACKGROUND The demand for the development of cancer nanomedicine has increased due to its great therapeutic value that can overcome the limitations of conventional cancer therapy.However,the presence of various bioact... BACKGROUND The demand for the development of cancer nanomedicine has increased due to its great therapeutic value that can overcome the limitations of conventional cancer therapy.However,the presence of various bioactive compounds in crude plant extracts used for the synthesis of silver nanoparticles(AgNPs)makes its precise mechanisms of action unclear.AIM To assessed the mRNA transcriptome profiling of human HepG2 cells exposed to Catharanthus roseus G.Don(C.roseus)-AgNPs.METHODS The proliferative activity of hepatocellular carcinoma(HepG2)and normal human liver(THLE3)cells treated with C.roseusAgNPs were measured using MTT assay.The RNA samples were extracted and sequenced using BGIseq500 platform.This is followed by data filtering,mapping,gene expression analysis,differentially expression genes analysis,Gene Ontology analysis,and pathway analysis.RESULTS The mean IC 50 values of C.roseusAgNPs on HepG2 was 4.38±1.59μg/mL while on THLE3 cells was 800±1.55μg/mL.Transcriptome profiling revealed an alteration of 296 genes.C.roseusAgNPs induced the expression of stress-associated genes such as MT,HSP and HMOX-1.Cellular signalling pathways were potentially activated through MAPK,TNF and TGF pathways that are responsible for apoptosis and cell cycle arrest.The alteration of ARF6,EHD2,FGFR3,RhoA,EEA1,VPS28,VPS25,and TSG101 indicated the uptake of C.roseus-AgNPs via both clathrin-dependent and clathrinindependent endocytosis.CONCLUSION This study provides new insights into gene expression study of biosynthesised AgNPs on cancer cells.The cytotoxicity effect is mediated by the aberrant gene alteration,and more interestingly the unique selective antiproliferative properties indicate the C.roseusAgNPs as an ideal anticancer candidate. 展开更多
关键词 Catharanthus roseus HEPG2 silver nanoparticles TRANSCRIPTOME oxidative stress Apoptosis Cell cycle
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TiO_2 nanoparticles prepared by hydrochloric acid leaching of mechanically activated and carbothermic reduced ilmenite 被引量:4
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作者 陶涛 陈启元 +2 位作者 胡慧萍 尹周澜 陈英 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1232-1238,共7页
A new combination method consisting of ball milling, carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite. The ball milling was emp... A new combination method consisting of ball milling, carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite. The ball milling was employed to grind ilmenite into small particles. The carbothermic reduction was carried out to yield a high titanium slag, which would be easily purified by subsequent leaching procedure. Factors affecting the hydrochloric acid process, namely the leaching time, temperature, and acid concentration, were studied. After leaching and calcining the milled and annealed mixture of FeTiO3/C under the optimal conditions, the TiO2 nanoparticles with size of 10-200 nm and purity〉98.0% were obtained. 展开更多
关键词 tio2 ILMENITE ball milling carbothermic reduction LEACHING nanoparticles
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Silver Nanoparticles Supported on TiO_(2) and Their Antibacterial Properties:Effect of Surface Confinement and Nonexistence of Plasmon Resonance
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作者 Zoe Vineth Quinones-Jurado Miguel ángel Waldo-Mendoza +3 位作者 Hugo Marcelo Aguilera-Bandin Edgar Giovanny Villabona-Leal Elsa Cervantes-González Elías Pérez 《Materials Sciences and Applications》 2014年第12期895-903,共9页
Ag/TiO2 nanocomposites are usually regarded as an effective synergy for high antimicrobial performance under ultraviolet-visible light conditions. This study confirmed that the surface plasmon resonance of Ag NPs play... Ag/TiO2 nanocomposites are usually regarded as an effective synergy for high antimicrobial performance under ultraviolet-visible light conditions. This study confirmed that the surface plasmon resonance of Ag NPs plays an important role in relation to the NPs size and consequently with the antibacterial effect of the nanocomposite. We observed that under visible light the reactivity of TiO2 cannot be amplified when it is supporting Ag NPs that have an inactive photocatalytically surface. The results confirmed that the antimicrobial effectiveness of nanocomposite based on Ag NPs supported-TiO2 is closely associated to the contact surface area and to the electronic performance of the noble metal. 展开更多
关键词 Ag-tio_(2) ANTIBACTERIAL silver nanoparticles Surface Confinement
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Preparation and photocatalytic performance of Cu-doped TiO_2 nanoparticles 被引量:6
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作者 杨希佳 王姝 +2 位作者 孙海明 王晓兵 连建设 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第2期504-509,共6页
Cu-doped TiO2 nanoparticles with different doping contents from 0 to 2.0% (mole fraction) were synthesized through sol-gel method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and field emissi... Cu-doped TiO2 nanoparticles with different doping contents from 0 to 2.0% (mole fraction) were synthesized through sol-gel method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscope (FE-SEM) were used to characterize the crystalline structure, chemical valence states and morphology of TiO2 nanoparticles. UV-Vis absorption spectrum was used to measure the optical absorption property of the samples. The photocatalytic performance of the samples was characterized by degrading 20 mg/L methyl orange under UV-Vis irradiation. The results show that the Cu-doped TiO2 nanoparticles exhibit a significant increase in photocatalytic performance over the pure TiO2 nanoparticles, and the TiO2 nanoparticles doped with 1.0% Cu show the best photocatalytic performance. The improvement in photocatalytic performance is attributed to the enhanced light adsorption in UV-Vis range and the decrease of the recombination rate of photoinduced electron-hole oair of the Cu-doped TiO2 nanoparticles. 展开更多
关键词 tio2 Cu nanoparticles PHOTOCATALYSIS DOPING sol-gel method
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Performance of Rhodamine-Sensitized Solar Cells Fabricated with Silver Nanoparticles
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作者 Bandana Ranamagar Isaac Abiye +2 位作者 Himsheela Karki Yucheng Lan Fasil Abebe 《Advances in Nanoparticles》 CAS 2023年第2期68-79,共12页
A plasmonic effect of silver nanoparticles (AgNPs) in dye-sensitized solar cells (DSSCs) is studied. In this investigation, the efficiency of dye-sensitized solar cells has been remarkably increased by infusion of syn... A plasmonic effect of silver nanoparticles (AgNPs) in dye-sensitized solar cells (DSSCs) is studied. In this investigation, the efficiency of dye-sensitized solar cells has been remarkably increased by infusion of synthesized silver nanoparticles into the TiO<sub>2</sub> photoanode. Rhodaminederivative RdS1 was synthesized by microwave-assisted condensation of hydrazide and 3-for-mylchromone. The synthesized silver nanoparticles were characterized with UV/Vis absorption spectroscopy and transmission electron microscopy. The interfacial charge transport phenomena of the dye-sensitized solar cell (DSSCs) are determined by electrochemical impedance spectroscopy and the corresponding efficiencies are calculated using current-voltage (I-V) curve. The solar cell photoanode with silver nanoparticles infused with RdS1 in titanium dioxide had the highest solar-to-electric power efficiency at 0.17%. 展开更多
关键词 tio2 silver nanoparticles RHODAMINE Optical Dye-Sensitized Solar Cell
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Effect of sub-acute exposure to TiO_2 nanoparticles on oxidative stress and histopathological changes in Juvenile Carp (Cyprinus carpio) 被引量:21
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作者 HAO Linhua WANG Zhenyu XING Baoshan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第10期1459-1466,共8页
Increasing application of nanotechnology highlights the need to clarify and understand nanotoxicity. Mammalian and in vitro studies have raised concerns about the toxicity of titanium dioxide nanoparticles (TiO2-NPs... Increasing application of nanotechnology highlights the need to clarify and understand nanotoxicity. Mammalian and in vitro studies have raised concerns about the toxicity of titanium dioxide nanoparticles (TiO2-NPs), but there are limited data on ecotoxicity to aquatic organisms. In this work, the sub-acute toxicity of TiO2-NPs to carp (Cyprinus carpio) was assessed. Superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) activities and lipid peroxidation (LPO) levels in liver, gill and brain tissues of carps varied with concentration of TiO2-NPs suspensions and exposure time (up to 8 d). As a result, 100 and 200 mg/L TiO2-NPs caused statistically significant decrease in SOD, CAT and POD activities and significant increase in LPO levels in tissues (P 〈 0.05), suggesting that the fish exposed to these two concentrations of TiO2-NPs suffered from the oxidative stress. The extent of depletion of antioxidant enzymes activities and the elevation of LPO in the liver was the greatest, indicating that the liver might be the most susceptible organ to TiO2-NPs exposure. In addition, carps had gill pathologies including edema and thickening of gill lamellae as well as gill filaments, and liver pathologies including necrotic and apoptosis hepatocytes after exposed to 100 and 200 mg/L TiO2-NPs for 20 d. These results indicated a potential risk from TiO2-NPs released into the aqueous environment. 展开更多
关键词 tio2 nanoparticles CARP sub-acute toxicity oxidative stress HISTOPATHOLOGY
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Luminescence intensification of lanthanide complexes by silver nanoparticles incorporated in sol-gel matrix 被引量:3
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作者 Renata Reisfeld Marek Pietraszkiewicz +1 位作者 Tsiala Saraidarov Viktoria Levchenko 《Journal of Rare Earths》 SCIE EI CAS CSCD 2009年第4期544-549,共6页
We present how the luminescence of europium RR-2-P-oxides complexes can be increased by interaction of electronic levels of the complex with the radiation field of silver nanoparticles (NPs). The procedure by which ... We present how the luminescence of europium RR-2-P-oxides complexes can be increased by interaction of electronic levels of the complex with the radiation field of silver nanoparticles (NPs). The procedure by which silver NPs are formed in a sol-gel polyurethane matrix precursor was elaborated. The formed Ag NPs were combined with Eu complex incorporated in ormocer matrix. The emission spectra of the complexes without silver NPs were compared with spectra of the same complexes with addition of silver NPs. As the result of the interaction of the electronic levels of lanthaaide ligands with silver plasmons, dramatic increase of luminescence was observed. 展开更多
关键词 luminescence intensification Eu RR-2-P-oxides complexes silver nanoparticles silica-polyurethane zirconia-glymo particles size distribution rare earths
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Effects of TiO2 nanoparticles on thermal conductivity of heat transfer oil 被引量:8
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作者 YIN Xiang KOU Guang-xiao +2 位作者 XU Ai-xiang FU Tao ZHU Jie 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第8期2129-2135,共7页
There is a lack of thermophysical data of heat transfer oil and nano-oil in the high temperature range of 50-300 ℃ for designing and developing heat transfer oil furnace and its heating systems. In the present study,... There is a lack of thermophysical data of heat transfer oil and nano-oil in the high temperature range of 50-300 ℃ for designing and developing heat transfer oil furnace and its heating systems. In the present study, the thermal conductivity values of heat transfer oil and TiO2 nano-oil in the above high temperature range were measured by a newly developed high-temperature thermal conductivity meter. Based on the principle of least square method, the thermal conductivity values obtained from experiments were fitted separately, and the correlation between thermal conductivity and temperature of heat transfer oil and TiO2 nano-oil was obtained. The results show that the thermal conductivity and the increased percentage of thermal conductivity of TiO2 nano-oil are proportional to the increase of particle size and mass fraction of nanoparticles, but thermal conductivity is in reverse proportion to the increase of temperature and the increased percentage of thermal conductivity is less affected by temperature. 展开更多
关键词 tio2 nano-oil thermal conductivity nanoparticlE
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STM and STS investigations of Ce-doped TiO_2 nanoparticles 被引量:4
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作者 HOU Tinghong MAO Jian ZHU Xiaodong TU Mingjing 《Rare Metals》 SCIE EI CAS CSCD 2006年第4期331-336,共6页
Ce-doped titanium oxide nanoparticles were investigated in the paper. The surface structures of undoped and Ce-doped TiO2 nanoparticles were observed by scanning tunneling microscopy (STM). The experimental results ... Ce-doped titanium oxide nanoparticles were investigated in the paper. The surface structures of undoped and Ce-doped TiO2 nanoparticles were observed by scanning tunneling microscopy (STM). The experimental results of scanning tunneling spectroscopy (STS) show that the surface electronic structures of TiO2 nanoparticles are modified by introducing new electronic states in the surface band gap through cerium ion doping. The results are discussed in terms of the influence of doping concentration on the surface band gap of TiO2. 展开更多
关键词 semiconductor materials tio2 nanoparticle STM/STS Ce-doping
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Fabrication of ultrafine Pd nanoparticles on 3D ordered macroporous TiO_2 for enhanced catalytic activity during diesel soot combustion 被引量:4
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作者 Yuechang Wei Qiangqiang Wu +2 位作者 Jing Xiong Jian Liu Zhen Zhao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第4期606-612,共7页
Nanocatalysts consisting of three‐dimensionally ordered macroporous(3DOM)TiO2‐supported ultrafine Pd nanoparticles(Pd/3DOM‐TiO2‐GBMR)were readily fabricated by gas bubbling‐assisted membrane reduction(GBMR)method... Nanocatalysts consisting of three‐dimensionally ordered macroporous(3DOM)TiO2‐supported ultrafine Pd nanoparticles(Pd/3DOM‐TiO2‐GBMR)were readily fabricated by gas bubbling‐assisted membrane reduction(GBMR)method.These catalysts had a well‐defined and highly ordered macroporous nanostructure with an average pore size of 280 nm.In addition,ultrafine hemispherical Pd nanoparticles(NPs)with a mean particle size of 1.1 nm were found to be well dispersed over the surface of the 3DOM‐TiO2 support and deposited on the inner walls of the material.The nanostructure of the 3DOM‐TiO2 support ensured efficient contact between soot particles and the catalyst.The large interface area between the ultrafine Pd NPs and the TiO2 also increased the density of sites for O2 activation as a result of the strong metal(Pd)‐support(TiO2)interaction(SMSI).A Pd/3DOM‐TiO2‐GBMR catalyst with ultrafine Pd NPs(1.1 nm)exhibited higher catalytic activity during diesel soot combustion compared with that obtained from a specimen having relatively large Pd NPs(5.0 nm).The T10,T50 and T90 values obtained from the former were 295,370 and 415°C.Both the activity and nanostructure of the Pd/3DOM‐TiO2‐GBMR catalyst were stable over five replicate soot oxidation trials.These results suggest that nanocatalysts having a 3DOM structure together with ultrafine Pd NPs can decrease the amount of Pd required,and that this approach has potential practical applications in the catalytic combustion of diesel soot particles. 展开更多
关键词 Ordered macroporous material Pd tio2 Diesel soot combustion Ultrafine nanoparticle Heterogeneous catalysis
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Enhanced Photocatalytic Efficiency of TiO2 by Combining the Modification of Ag Nanoparticles with the Application of Anodic Bias 被引量:3
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作者 ChunHE YaXIONG +1 位作者 DongSHU XiHaiZHU 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第5期539-542,共4页
Ag-TiO2/ITO film electrode was used as photoanode to investigate the feasibility of a hybrid technology of Ag nanoparticles combined with the application of anodic bias. The results showed that the deposited Ag and a... Ag-TiO2/ITO film electrode was used as photoanode to investigate the feasibility of a hybrid technology of Ag nanoparticles combined with the application of anodic bias. The results showed that the deposited Ag and applied anodic bias have an apparent additive effect. 展开更多
关键词 PHOTOELECTROCHEMISTRY PHOTOCATALYSIS Ag nanoparticles tio2 formic acid.
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TiO_2 composite nanotubes embedded with CdS and upconversion nanoparticles for near infrared light driven photocatalysis 被引量:6
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作者 Wanni Wang Fu Zhang +4 位作者 Chuanling Zhang Yang Wang Wei Tao Sheng Cheng Haisheng Qian 《Chinese Journal of Catalysis》 CSCD 北大核心 2017年第11期1851-1859,共9页
We report a colloidal process to coat a layer of TiO2onto SiO2composite nanofibers containing embedded CdS and upconversion nanoparticles(UCNPs).The SiO2composite nanofibers were fabricated by electrospinning.To impro... We report a colloidal process to coat a layer of TiO2onto SiO2composite nanofibers containing embedded CdS and upconversion nanoparticles(UCNPs).The SiO2composite nanofibers were fabricated by electrospinning.To improve the energy transfer efficiency,UCNPs and CdS nanoparticles were bound in close proximity to each other within the SiO2matrix.β‐NaYF4:Yb(30%),Tm(0.5%)@NaYF4:Yb(20%),Er(2%)core–shell nanoparticles were used as nanotransducers for near infrared light.These nanoparticles exhibited enhanced upconversion fluorescence compared withβ‐NaYF4:Yb(30%),Tm(0.5%)orβ–NaYF4:Yb(30%),Tm(0.5%)@NaYF4nanoparticles.The morphologies,size and chemical compositions have been extensively investigated using field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),X‐ray diffraction(XRD)and X‐ray photoelectron spectra(XPS),respectively.The TEM images showed that the TiO2composite nanotubes were embedded with a large amount of UCNPs and CdS nanoparticles.The composite TiO2nanotubes degraded more than90%of rhodamine B(RhB)dye during20min of irradiation by simulated solar light.In particular,more than50%of RhB was decomposed in70min,under irradiation of near infrared light(NIR).This high degradation was attributed to the full spectrum absorption of solar light,and the enhanced transfer efficiency for near infrared light.The as‐prepared nanostructures can harness solar energy,and provide an alternative to overcome energy shortages and environmental protection. 展开更多
关键词 tio2 nanotubes Upconversion nanoparticles Energy transfer PHOTOCATALYSIS Nanotransducer
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Electrochemical determination of vitamin C in the presence of uric acid by a novel TiO_2 nanoparticles modified carbon paste electrode 被引量:3
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作者 Mohammad Mazloum-Ardakani Mohammad Ali Sheikh-Mohseni +2 位作者 Hadi Beitollahi Ali Benvidi Hossein Naeimi 《Chinese Chemical Letters》 SCIE CAS CSCD 2010年第12期1471-1474,共4页
The electrochemical behavior of vitamin C(ascorbic acid or AA) is investigated on the surface of a carbon-paste electrode modified with TiO2 nanoparticles and 2,2'-(1,2 butanediylbis(nitriloethylidyne))-bis-hyd... The electrochemical behavior of vitamin C(ascorbic acid or AA) is investigated on the surface of a carbon-paste electrode modified with TiO2 nanoparticles and 2,2'-(1,2 butanediylbis(nitriloethylidyne))-bis-hydroquinone(BBNBH).The prepared modified electrode showed an efficient catalytic role in the electrochemical oxidation of AA,leading to remarkable decrease in oxidation overpotential and enhancement of the kinetics of the electrode reaction.This modified electrode exhibits well-separated oxidation peaks for AA and uric acid(UA).The modified electrode is successfully applied for the accurate determination of AA in pharmaceutical preparations. 展开更多
关键词 Ascorbic acid Uric acid tio2 nanoparticles ELECTROCATALYSIS Modified carbon paste electrode
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Fabrication, annealing, and electrocatalytic properties of platinum nanoparticles supported on self-organized TiO_2 nanotubes 被引量:2
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作者 LEI Bin XUE Jianjun JIN Danping NIShougao SUN Haibo 《Rare Metals》 SCIE EI CAS CSCD 2008年第5期445-450,共6页
The platinum nanoparticles supported on self-organized TiO2 nanotubes (Pt-TiO2/Ti) were prepared using electrochemical anodic oxidation followed by cathodic reduction. The structure and chemical nature of the Pt-TiO... The platinum nanoparticles supported on self-organized TiO2 nanotubes (Pt-TiO2/Ti) were prepared using electrochemical anodic oxidation followed by cathodic reduction. The structure and chemical nature of the Pt-TiO2/Ti electrocatalyst were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Both XRD and SEM results indicate the presence of platinum on nanotubular TiO2. The stability of the Pt deposits was also investigated in 0.5 mol/L H2SO4 solution by cyclic voltammetry. The electrocatalytic activity of the Pt-TiO2/Ti catalyst exhibits enhancement effect during electro-oxidation of methanol when annealed to anatase. Successive cyclic voltam- mograms of methanol oxidation on the Pt-TiO2/Ti electrocatalyst shows unique electrocatalytic characteristics when compared to methanol oxidation on the bulk Pt catalyst. This is because of further quick oxidation of adsorbed CO by Pt (111) facets of Pt particles on self-organized TiO2 nanotubes when the formation of an electroactive film onto the working catalyst surface occurs. 展开更多
关键词 platinum nanoparticles tio2 nanotubes cyclic voltammetry methanol oxidation electrocatalytic properties
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Effect of TiO_2 Nanoparticles on Photochromism of WO_3 Colloids 被引量:2
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作者 FEI Xiao-fang SHAN Gui-ye +3 位作者 KONG Xiang-gui WANG Xin ZENG Qing-hui ZHANG You-lin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2006年第1期85-89,共5页
WO2 and TiO2 colMds were synthesized by the hydrolysis technique and part of the TiO2 colloid was treated by means of the hydrothermal method. The photochromic performances of the resulting materials obtained via comb... WO2 and TiO2 colMds were synthesized by the hydrolysis technique and part of the TiO2 colloid was treated by means of the hydrothermal method. The photochromic performances of the resulting materials obtained via combining the WO3 colloid with the treated TiO2 colloid and the non-treated TiO2 colloid, respectively, are very different. The TiO2 colloid without hydrothermal treatment can effectively improve the photochromic performance of the WO3colloid. The TiO2 nanoparticles were investigated in detail by XRD, TEM, surface photovohage spectra(SPS) and field-induced surface photovoltage spectrometry(FISPS). The photochromism mechanism of WO3 colloid is discussed. 展开更多
关键词 tio2 nanoparticle WO3 colloid PHOTOCHROMISM
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Surface Texturing of TiO_2 Film by Mist Deposition of TiO_2 Nanoparticles 被引量:1
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作者 Gang Qin Akira Watanabe 《Nano-Micro Letters》 SCIE EI CAS 2013年第2期129-134,共6页
Unique and various microstructures of titanium oxide(TiO_2 ) film including macroporous structure, chromatic veins and rings, have been easily fabricated by mist deposition method on silicon substrate with mild prepar... Unique and various microstructures of titanium oxide(TiO_2 ) film including macroporous structure, chromatic veins and rings, have been easily fabricated by mist deposition method on silicon substrate with mild preparation conditions. Rutile phase TiO_2 nanoparticles were directly used as starting material to prepare film and led to a simple preparation process. It was found that several different microstructures existed in the sample and changed with the varied positions from the center to the edge of the film when the concentration of the TiO_2 suspension is 0.06 mol/l, the deposition time is 30 min, the flow rate is 1 l/min and the temperature is150. The surface texturing shows apparent distinction as the concentration of the TiO_2 suspension decreased to 0.03 mol/l and 0.01 mol/l. 展开更多
关键词 Mist deposition tio2 film tio2 nanoparticle Surface texturing Microstructure
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Surface Modified TiO2 Nanoparticles-an Effective Anti-wear and Anti-friction Additive for Lubricating Grease 被引量:1
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作者 Li Yi Liu Xinyang +1 位作者 Liu Dajun Sun Hongwei 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2017年第2期74-79,共6页
The surface modified TiO_2 nanoparticles were prepared by using 12-hydroxystearic acid chemically modified on the TiO_2 surface. The average size of the TiO_2 particles is about 30 nm. The optimum ratio of tetrabutyl ... The surface modified TiO_2 nanoparticles were prepared by using 12-hydroxystearic acid chemically modified on the TiO_2 surface. The average size of the TiO_2 particles is about 30 nm. The optimum ratio of tetrabutyl titanate to 12-hydroxystearic acid was 1/0.5. The bonding form between 12-hydroxystearic acid and TiO_2 nucleus was investigated by FTIR, DSC, TGA and XRD techniques. The lubricating grease containing the surface modified TiO_2 nanoparticles possesses excellent anti-wear and anti-friction properties. Compared with the grease without TiO_2, the PB value can be increased by 52% as the best performance of the grease containing surface modified TiO_2 nanoparticles, while the friction coefficient can be reduced by 33% with the addition of a small amount of TiO_2 nanoparticles, and meanwhile the wear scar diameter decreases by 25%. 展开更多
关键词 tio2 nanoparticles lubricating GREASE ANTI-WEAR anti-friction
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Transient competition between photocatalysis and carrier recombination in TiO_2 nanotube film loaded with Au nanoparticles 被引量:1
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作者 邵珠峰 杨延强 +1 位作者 刘树田 王强 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第9期298-305,共8页
Highly ordered TiO2 nanotube array (TNA) films are fabricated by using an anodic oxidation method. Au nanoparticles (NPs) films are decorated onto the top of TNA films with the aid of ion-sputtering and thermal an... Highly ordered TiO2 nanotube array (TNA) films are fabricated by using an anodic oxidation method. Au nanoparticles (NPs) films are decorated onto the top of TNA films with the aid of ion-sputtering and thermal annealing. An enhanced photocatalytic activity under ultraviolet C (UVC, 266 nm) light irradiation is obtained compared with that of the pristine TNA, which is shown by the steady-state photoluminescence (PL) spectra. Furthermore, a distinct blue shift in the nanosecond time-resolved transient photoluminescence (NTRT-PL) spectra is observed. Such a phenomenon could be well explained by considering the competition between the surface photocatalytic process and the recombination of the photo-generated carriers. The enhanced UV photocatalytic activities of the Au-TNA composite are evaluated through photo-degradation of methyl orange (MO) in an aqueous solution with ultraviolet-visible absorption spectrometry. Our current work may provide a simple strategy to synthesize defect-related composite photocatalytic devices. 展开更多
关键词 tio2 nanotube array film Au nanoparticles oxygen vacancies photocatalytic activity
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Ag-Cu Nanoparticles Supported on N-Doped TiO2 Nanowire Arrays for Efficient Photocatalytic CO2 Reduction 被引量:1
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作者 Xiao-nong Wang Jun Ma +2 位作者 Yang-guang Hu Ran Long Yu-jie Xiong 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2018年第5期695-700,736,共7页
Photocatalytic reduction of CO2 into various types of fuels has attracted great interest,and serves as a potential solution to addressing current global warming and energy challenges.In this work,Ag-Cu nanoparticles a... Photocatalytic reduction of CO2 into various types of fuels has attracted great interest,and serves as a potential solution to addressing current global warming and energy challenges.In this work,Ag-Cu nanoparticles are densely supported on N-doped TiO2 nanowire through a straightforward nanofabrication approach.The range of light absorption by N-doped TiO2 can be tuned to match the plasmonic band of Ag nanoparticles,which allows synergizing a resonant energy transfer process with the Schottky junction.Meanwhile,Cu nanoparticles can provide active sites for the reduction of CO2 molecules.Remarkably,the performance of photocatalytic CO2 reduction is improved to produce CH4 at a rate of 720μmol·g-1·h-1 under full-spectrum irradiation. 展开更多
关键词 Photocatalytic CO2 reduction Schottky junction Energy transfer tio2 nanoparticles
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Functionalization of Nylon Fabrics with Dopamine Deposition and TiO2 Nanoparticles Immobilization 被引量:1
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作者 范佳娜 张梅 +4 位作者 伍静娇 邱夷平 沈丽 刘万双 蒋秋冉 《Journal of Donghua University(English Edition)》 EI CAS 2017年第1期82-85,共4页
Ultraviolet(UV)radiation can cause degradation or aging of many polymers and shorten the working-life of their products.Thus,UV protective covers are required in various occasions.Textiles with the UV-shielding functi... Ultraviolet(UV)radiation can cause degradation or aging of many polymers and shorten the working-life of their products.Thus,UV protective covers are required in various occasions.Textiles with the UV-shielding function possess unique properties compared with those covers in board or film shapes.TiO_2 nanoparticles(NPs),which were reported to have superior UV blocking function,can be used to produce UV protective covers in combination with fabric.However,efficient and environmentally friendly immobilization of TiO_2 Nps onto the fabrics is challenging.Polydopamine(PDA),a biomimetic synthetic polymer,has attracted great attentions recently due to its superior affinity to various materials and facile application procedure.Hence,in this research,the surface of nylon fabrics was modified by PDA to immobilizeTiO_2 NPs.Themodificationconditionswere systematically optimized.The immobilization of the NPs was confirmed by Fourier transform infrared spectrometer(FTIR)and scanning electron microscope(SEM).The functionalized nylon fabrics were proved to exhibit improved UV protection properties even after washing.This work provides a new and versatile surface modification technique for textiles. 展开更多
关键词 polydopamine(PDA) nylon fabric tio2 nanoparticles(NPs) UV protection FUNCtioNALIZAtioN
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