The application of amino acid-based surfactant in dishwasher detergent was studied in this paper. The foam and oil-removing performance of amino acid surfactants in alkaline condition were test to discuss feasibility ...The application of amino acid-based surfactant in dishwasher detergent was studied in this paper. The foam and oil-removing performance of amino acid surfactants in alkaline condition were test to discuss feasibility of amino acid-based surfactant from natural origin as the alternative to traditional nonionic surfactants from petroleum origin in dishwasher detergent. Comparative study was conducted through using various amino acid-based surfactants and nonionic surfactants respectively, together with enzymes and peroxide to formulate dishwasher detergents, and their application properties such as foam performance and detergency were also evaluated when washing different tableware in automatic dishwasher. The results showed that among all tested amino acid surfactants, glutamate surfactants showed low foaming and high oil-removing ability in alkaline condition, and excellent decontamination ability in dishwashing tests.展开更多
Surfactant flooding is an important technique used to improve oil recovery from mature oil reservoirs due to minimizing the interfacial tension(IFT)between oil and water and/or altering the rock wettability toward wat...Surfactant flooding is an important technique used to improve oil recovery from mature oil reservoirs due to minimizing the interfacial tension(IFT)between oil and water and/or altering the rock wettability toward water-wet using various surfactant agents including cationic,anionic,non-ionic,and amphoteric varieties.In this study,two amino-acid based surfactants,named lauroyl arginine(L-Arg)and lauroyl cysteine(L-Cys),were synthesized and used to reduce the IFT of oil–water systems and alter the wettability of carbonate rocks,thus improving oil recovery from oil-wet carbonate reservoirs.The synthesized surfactants were characterized using Fourier transform infrared spectroscopy and nuclear magnetic resonance analyses,and the critical micelle concentration(CMC)of surfactant solutions was determined using conductivity,pH,and turbidity techniques.Experimental results showed that the CMCs of L-Arg and L-Cys solutions were 2000 and 4500 ppm,respectively.It was found that using L-Arg and L-Cys solutions at their CMCs,the IFT and contact angle were reduced from 34.5 to 18.0 and15.4 mN/m,and from 144°to 78°and 75°,respectively.Thus,the L-Arg and L-Cys solutions enabled approximately 11.9%and 8.9%additional recovery of OOIP(original oil in place).It was identified that both amino-acid surfactants can be used to improve oil recovery due to their desirable effects on the EOR mechanisms at their CMC ranges.展开更多
This study investigates the effect of counterions on the chiral recognition of 1,1'-Binaphthyl-2,2'-diamine (BNA) and 1,1'-Binaphthyl-2,2'-diyl hydrogenphosphate (BNP) enantiomers when using an amino a...This study investigates the effect of counterions on the chiral recognition of 1,1'-Binaphthyl-2,2'-diamine (BNA) and 1,1'-Binaphthyl-2,2'-diyl hydrogenphosphate (BNP) enantiomers when using an amino acid-based surfactant undecanoyl L-leucine (und-Leu) as the chiral pseudostationary phase in capillary electrophoresis. The effects of using two different counterions (sodium and lysine) on the chiral recognition of binaphthyl derivatives were compared at varying pH conditions. The enantiomeric separation of BNA and BNP enantiomers via capillary electrophoresis, using und-Leu as the chiral recognition medium, significantly improved the enantiomeric resolution in capillary electrophoresis at pH 7 when using Lysine counterions as compared to using sodium as the counterion. More specifically, at a surfactant concentration of 45 mM, at pH 7, a significant increase in chiral selectivity was observed when lysine was used as the counterion compared to sodium. The enantiomeric resolution of BNA and BNP increased by 6-fold and 1.1-fold, respectively, in capillary electrophoresis experiments when lysine was utilized as the counterion compared to using sodium. Furthermore, the retention factor of BNA and BNP enantiomers also increased approximately 3.5-fold and 4-fold, respectively, in the presence of lysine counterions as compared to using sodium counterions. When running buffer in capillary electrophoresis was increased to pH 11, the resolution and retention factors were nearly identical when comparing the effects of the sodium and lysine counterions. This signifies the important role of lysine’s positive net charge on chiral recognition. This study provides insight into the potential advantages of using cationic, pH-dependent counterions such as lysine to significantly improve the chiral recognition of binaphthyl derivatives when using chiral anionic surfactants as the pseudostationary phase in capillary electrophoresis.展开更多
The liquid membrane oscillation of a novel water（aqueous tetradecyl trimethyl ammoniumbromide,TTAB and alcohol solution）/oil（picric acid in chloroform solution）/water（aqueous glucose solution） system was investi...The liquid membrane oscillation of a novel water（aqueous tetradecyl trimethyl ammoniumbromide,TTAB and alcohol solution）/oil（picric acid in chloroform solution）/water（aqueous glucose solution） system was investigated by means of a homemade device.The results show that the water（aqueous 7 mmol/L TTAB and 0.5 mol/L n-propanol solution）/oil（0.5 mmol/L icric acid in chloroform solution）/water（0.1 mol/L glucose solution） system performed sustained and stable oscillation at 30℃.The oscillation curve under optimized conditions is considered to be referent.Several oscillation curves were accumulated with the addition of different amino acids.The results showed that the novel system can recognize the added amino acids such as L-tryptophan,L-tyrosine,and D,L-tyrosine.And there is corresponding relationship between the change of curve shape and the quantity of amino acid added.展开更多
Ab initio calculations were performed using the Gaussian 03 software package to obtain the optimized structure, interaction energy and infrared spectrum of ionic liquids （ILs） containing a tetraalkylphosphonium cati...Ab initio calculations were performed using the Gaussian 03 software package to obtain the optimized structure, interaction energy and infrared spectrum of ionic liquids （ILs） containing a tetraalkylphosphonium cation and an amino acid anion. In order to investigate the effect of the presence of nitrogen in the cation, the tetraalkylphosphonium cation was replaced by a tetraalkylammonium cation, while amino acids were retained as anions in the ionic liquid. The amino acids studied here included glycine, alanine, serine, lysine, and glutamine. Optimized structures of several ILs in the gas phase were determined at the levels of Hartree-Fock （HF/6-3＋G（d）） and 1density functional theory （B3LYP/6-3 1＋＋G（d,p））. At high-level estimations, MP2/6-31＋G（d） and MP2/6-31＋＋G（d,p）, the interaction energies between the cations and anions of the ILs were determined. In order to investigate the effect of alkyl-chain length on interaction energy, the alkyl groups were varied from methyl to ethyl and propyl in the tetraalkylphosphonium functional groups. This procedure revealed that there is a considerably stronger interaction between the alkylphosphonium cations and amino acids than between alkylammonium cations and amino acids. Vibrational spectroscopy of ILs shows that a significant -OH vibration peak occurs at 4124 cmt in serine-containing ILs, and a prominent C=O vending peak occurs at 1626 cm^-1 in amino acids.展开更多
文摘The application of amino acid-based surfactant in dishwasher detergent was studied in this paper. The foam and oil-removing performance of amino acid surfactants in alkaline condition were test to discuss feasibility of amino acid-based surfactant from natural origin as the alternative to traditional nonionic surfactants from petroleum origin in dishwasher detergent. Comparative study was conducted through using various amino acid-based surfactants and nonionic surfactants respectively, together with enzymes and peroxide to formulate dishwasher detergents, and their application properties such as foam performance and detergency were also evaluated when washing different tableware in automatic dishwasher. The results showed that among all tested amino acid surfactants, glutamate surfactants showed low foaming and high oil-removing ability in alkaline condition, and excellent decontamination ability in dishwashing tests.
文摘Surfactant flooding is an important technique used to improve oil recovery from mature oil reservoirs due to minimizing the interfacial tension(IFT)between oil and water and/or altering the rock wettability toward water-wet using various surfactant agents including cationic,anionic,non-ionic,and amphoteric varieties.In this study,two amino-acid based surfactants,named lauroyl arginine(L-Arg)and lauroyl cysteine(L-Cys),were synthesized and used to reduce the IFT of oil–water systems and alter the wettability of carbonate rocks,thus improving oil recovery from oil-wet carbonate reservoirs.The synthesized surfactants were characterized using Fourier transform infrared spectroscopy and nuclear magnetic resonance analyses,and the critical micelle concentration(CMC)of surfactant solutions was determined using conductivity,pH,and turbidity techniques.Experimental results showed that the CMCs of L-Arg and L-Cys solutions were 2000 and 4500 ppm,respectively.It was found that using L-Arg and L-Cys solutions at their CMCs,the IFT and contact angle were reduced from 34.5 to 18.0 and15.4 mN/m,and from 144°to 78°and 75°,respectively.Thus,the L-Arg and L-Cys solutions enabled approximately 11.9%and 8.9%additional recovery of OOIP(original oil in place).It was identified that both amino-acid surfactants can be used to improve oil recovery due to their desirable effects on the EOR mechanisms at their CMC ranges.
文摘This study investigates the effect of counterions on the chiral recognition of 1,1'-Binaphthyl-2,2'-diamine (BNA) and 1,1'-Binaphthyl-2,2'-diyl hydrogenphosphate (BNP) enantiomers when using an amino acid-based surfactant undecanoyl L-leucine (und-Leu) as the chiral pseudostationary phase in capillary electrophoresis. The effects of using two different counterions (sodium and lysine) on the chiral recognition of binaphthyl derivatives were compared at varying pH conditions. The enantiomeric separation of BNA and BNP enantiomers via capillary electrophoresis, using und-Leu as the chiral recognition medium, significantly improved the enantiomeric resolution in capillary electrophoresis at pH 7 when using Lysine counterions as compared to using sodium as the counterion. More specifically, at a surfactant concentration of 45 mM, at pH 7, a significant increase in chiral selectivity was observed when lysine was used as the counterion compared to sodium. The enantiomeric resolution of BNA and BNP increased by 6-fold and 1.1-fold, respectively, in capillary electrophoresis experiments when lysine was utilized as the counterion compared to using sodium. Furthermore, the retention factor of BNA and BNP enantiomers also increased approximately 3.5-fold and 4-fold, respectively, in the presence of lysine counterions as compared to using sodium counterions. When running buffer in capillary electrophoresis was increased to pH 11, the resolution and retention factors were nearly identical when comparing the effects of the sodium and lysine counterions. This signifies the important role of lysine’s positive net charge on chiral recognition. This study provides insight into the potential advantages of using cationic, pH-dependent counterions such as lysine to significantly improve the chiral recognition of binaphthyl derivatives when using chiral anionic surfactants as the pseudostationary phase in capillary electrophoresis.
基金Supported by the Open Research Fund of Shenzhen Key Laboratory of Functional Polymer,China
文摘The liquid membrane oscillation of a novel water（aqueous tetradecyl trimethyl ammoniumbromide,TTAB and alcohol solution）/oil（picric acid in chloroform solution）/water（aqueous glucose solution） system was investigated by means of a homemade device.The results show that the water（aqueous 7 mmol/L TTAB and 0.5 mol/L n-propanol solution）/oil（0.5 mmol/L icric acid in chloroform solution）/water（0.1 mol/L glucose solution） system performed sustained and stable oscillation at 30℃.The oscillation curve under optimized conditions is considered to be referent.Several oscillation curves were accumulated with the addition of different amino acids.The results showed that the novel system can recognize the added amino acids such as L-tryptophan,L-tyrosine,and D,L-tyrosine.And there is corresponding relationship between the change of curve shape and the quantity of amino acid added.
文摘Ab initio calculations were performed using the Gaussian 03 software package to obtain the optimized structure, interaction energy and infrared spectrum of ionic liquids （ILs） containing a tetraalkylphosphonium cation and an amino acid anion. In order to investigate the effect of the presence of nitrogen in the cation, the tetraalkylphosphonium cation was replaced by a tetraalkylammonium cation, while amino acids were retained as anions in the ionic liquid. The amino acids studied here included glycine, alanine, serine, lysine, and glutamine. Optimized structures of several ILs in the gas phase were determined at the levels of Hartree-Fock （HF/6-3＋G（d）） and 1density functional theory （B3LYP/6-3 1＋＋G（d,p））. At high-level estimations, MP2/6-31＋G（d） and MP2/6-31＋＋G（d,p）, the interaction energies between the cations and anions of the ILs were determined. In order to investigate the effect of alkyl-chain length on interaction energy, the alkyl groups were varied from methyl to ethyl and propyl in the tetraalkylphosphonium functional groups. This procedure revealed that there is a considerably stronger interaction between the alkylphosphonium cations and amino acids than between alkylammonium cations and amino acids. Vibrational spectroscopy of ILs shows that a significant -OH vibration peak occurs at 4124 cmt in serine-containing ILs, and a prominent C=O vending peak occurs at 1626 cm^-1 in amino acids.
