检索结果-南通市图书馆

Journal of Magnesium and Alloys 2023年第1期11卷 287-300页

作者： Honggun Song Zhidong Xu Lahouari Benabou Zheng Yin Hongyu Guan Hong Yan Luo Chao Zhi Hu Xudong Wang Department of Mechanical and Electrical Engineering Nanchang UniversityNanchang330031China UniversitéParis-Saclay UVSQLISV78124Vélizy-VillacoublayFrance Institute for Advanced Study Nanchang UniversityNanchang330031China

The corrosion inhibition behavior of Mg-8Li-3Al alloy in NaCl solution with sodium dodecyl sulfate(SDS)was investigated by hydrogen analysis,scanning electron microscopy(SEM),electrochemical test,scanning Kelvin probe force microscopy(SKPFM)and computational *** showed that the corrosion resistance of Mg-8Li-3Al alloy in NaCl solution was effectively improved with *** SEM and SKPFM results confirmed a dense,200 nm-thick SDS-adsorbed layer had formed on the alloy *** separation energy ΔE_(gap) and adsorption energy E_(ads) of SDS on the Mg surface were calculated by density functional theory and molecular dynamics simulations,*** the corrosion inhibition mechanism was hypothesized and described.

关键词： Mg-Li alloy Corrosion sodium dodecyl sulfate Scanning kelvin probe force microscopy Density functional theory Molecular dynamics

sodium dodecyl sulfate sensitized electrochemical method for subnanomole level determination of ortho-phenylphenol at a novel disposable electrode

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2011年第7期54卷 1116-1122页

作者： LI HongBo LI Jing MENG DongMei PENG JinYun QIAO QiuJu YANG ZhanJun XU Qin HU XiaoYa College of Chemistry and Engineering Fangzhou University Yangzhou 225002 China Chemistry and Biology Engineering School Yancheng Institute of Technology Yancheng 224051 China

The electrochemical behavior of ortho-phenylphenol （OPP） at a disposable electrode （an improved wax-impregnated graphite electrode） in the presence of sodium dodecyl sulfate （SDS） was studied for the first time. The results demonstrated that the electrocatalytic oxidation process of OPP was accompanied with two-charge-two-proton transference. The electronic transmission coefficient （a） and diffusion coefficient （DR） for OPP were calculated to be 0.8126 and 3.61× 10^-2 cm2/s, respectively. The electrochemical signal was apparently improved by SDS at the disposable electrode and the oxidative peaks current was proportional to the concentration of OPP over the range from 1.0 ×10^-9 to 4.0 × 10^-6 mol/L with the detection limit of 8.7× 10^-10 mol/L. This novel and highly sensitive method can be successfully applied to detect OPP in the orange rind sample.

关键词： sodium dodecyl sulfate electrochemical determination ortho-phenylphenol disposable electrode

Enhancing the leaching effect of an ion-absorbed rare earth ore by ameliorating the seepage effect with sodium dodecyl sulfate surfactant

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2021年第6期31卷 995-1002页

作者： Yongbing Zhang Boyuan Zhang Siqi Yang Zhigang Zhong Hepeng Zhou Xianping Luo Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control Ganzhou 341000China Key Laboratory of Ionic Rare Earth Resources Development and Application Ministry of EducationGanzhou 341000China Faculty of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Ameliorating the problem of low leaching efficiency,long leaching period,and high agent consumption should be studied to efficiently exploit ion-absorbed rare earth ore *** this study,the surfactant sodium dodecyl sulfate(SDS) is used to enhance the leaching effect of an ion-absorbed rare earth ore by ameliorating the seepage effect for the first *** effects of surfactant concentration,leaching agent dosage,solution flow velocity,and solution pH on the leaching rate were explored,and the mechanism of SDS was *** the optimum conditions,the addition of a small amount of SDS(mass fraction0.04%) can increase the leaching rate by about 5%,shorten the leaching period,and reduce the consumption of the leaching *** significantly ameliorates the seepage effect of the ore body by reducing the surface tension of the leaching agent and ameliorating the wettability of the mineral *** effect is the main factor that improves the leaching ***(density functional theory) calculation results show that SDS can react with rare earth ions,which reduces the adsorption strength on clay mineral ***,rare earth ions are easily exchanged by ammonium ions,and mass transfer is enhanced.

关键词： Ion-absorbed rare earth ore Surfactant sodium dodecyl sulfate Leaching Seepage effect Adsorption

Molecular dynamics simulations of the effects of sodium dodecyl sulfate on lipid bilayer

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第3期26卷 303-307页

作者：徐斌林文强汪小刚曾松伟周国泉陈均朗 School of Sciences Zhejiang A ＆ F University Lin’an 311300 China School of Information and Industry Zhejiang A ＆ F University Lin ’ an 311300 China

Molecular dynamics simulations have been performed on the fully hydrated lipid bilayer with different concentrations of sodium dodecyl sulfate （SDS）. SDS can readily penetrate into the membrane. The insertion of SDS causes a decrease in the bilayer area and increases in the bilayer thickness and lipid tail order, when the fraction of SDS is less than 28%. Through calculating the binding energy, we confirm that the presence of SDS strengthens the interactions among the DPPC lipids, while SDS molecules act as intermedia. Both the strong hydrophilic interactions between sulfate and phosphocholine groups and the hydrophobic interactions between SDS and DPPC hydrocarbon chains contribute to the tight packing and ordered alignment of the lipids. These results are in good agreement with the experimental observations and provide atomic level information that complements the experiments.

关键词： surfactant sodium dodecyl sulfate lipid bilayer molecular dynamics simulations

Room Temperature Synthesis of Gold Nanokites in Polyvinyl Alcohol-sodium dodecyl sulfate Aggregations Aqueous Solution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2011年第9期29卷 1955-1960页

作者： Ren, Yueping Liu, Jia Feng, Feng Chen, Tingzhong Fang, Yun School of Chemical ＆ Material Engineering Jiangnan University Wuxi Jiangsu 214122 China

Controlled synthesis of asymmetrical gold nanokites was realized by reducing HAuCl4 with polyvinyl alcohol （PVA） in PVA-sodium dodecyl sulfate （SDS） aggregations aqueous solution at room temperature without any addi- tional reducing agents. The crystal structures, optical property and growth process of the gold nanokites were inves- tigated by X-ray diffraction （XRD）, Vis-NIR spectrum and transmission electron microscope （TEM）. HAuCl4 con- centration dramatically influenced the morphologies of the products. When HAuCl4 concentration was increased from 0.5 mmol·L^-1 to 2.2 mmol·L^-1, the products changed from network-like nanostructures to nanokites, nanoleaves and microplates. SDS was indispensable for the formation of gold nanokites and without SDS su- per-branched structures became the dominant products.

关键词： gold nanostructures nanokites polyvinyl alcohol sodium dodecyl sulfate

Effect of β-Cyclodextrin Upon the Sol-gel Transition of Methylcellulose Solutions in the Presence of sodium dodecyl sulfate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2012年第2期25卷 242-248,I0004页

作者： Hua-yu Li Xiang Hao Yong-jun Xie Hai-yang Yang He Liu Jian-hui Luo Department of Polymer Science and Engineering University of Science and Technology of ChinaHefei 230026China Research Institute of Science and Technology China National Petroleum CorporationBeijing 100083China

The sol-gel transition temperature of methylcellulose （MC） solution in the presence of sodium dodecyl sulfate （SDS） as well as the mixtures of SDS and β-cyclodextrin （β-CD） was mea- sured, and the effect of the two competing interactions, the hydrophobic interaction between SDS and MC and the inclusion interaction between SDS and β-CD, upon the sol-gel transition of MC solution was studied. It has been found that the inclusion interaction between SDS and β-CD is much greater than the hydrophobic interaction between SDS and MC. As a result, in the coexistence of SDS and β-CD, the sol-gel transition temperature of MC solution keeps the same value, independent of the concentration of SDS in solution on con- dition that the concentration of SDS is less than β-CD. Our experimental results not only suggest that the effect of SDS upon the sol-gel transition of MC solution can be screened by β-CD completely but also indicate the inclusion ratio of SDS to β-CD can be determined quantitatively by using rheological measurement. The inclusion ratio of SDS to β-CD is 1：1, which is in good agreement with the inclusion ratio of SDS to β-CD in the presence of poly（vincyl pyrrolidone） determined by the viscosity measurement but is critically different from the inclusion ratio of SDS to β-CD in the presence of the oppositely charged polyelec-trolyte by using the rheological measurement, mainly due to the reason that the mechanism of the interaction between SDS and MC is critically different from the mechanism of the interaction between SDS and the oppositely charged polyelectrolyte.

关键词： Methylcellulose sodium dodecyl sulfate β-CD Sol-gel transition Inclusion interaction

The Electrooxidation of Tetracycline at Acetylene Black Electrode in the Presence of sodium dodecyl sulfate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2004年第7期15卷 821-822页

作者： XuePingDANG ChengGuoHU YingLiangWEI ShengShuiHU DepartmentofChemistry WuhanUniversityWuhan430072

The electrooxidation of tetracycline (TC) at acetylene black electrode has been studied in the presence of sodium dodecyl sulfate (SDS). Tetracycline (TC) exhibited very sensitive oxidation peak in this system. The peak current was proportional to TC concentration, and the detection limit was 1.2×10-8 mol/L. The system was used to the determination of TC in Pharmaceuticals.

关键词： Tetracycline surfactant sodium dodecyl sulfate acetylene black electrode.

Intermolecular Interactions in Self-Assembly Process of sodium dodecyl sulfate by Vertically Polarized Raman Spectra

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2017年第4期30卷 365-371,I0001页

作者：王钰熙林珂陈琳周晓国刘世林中国科学技术大学化学物理系合肥微尺度物质科学国家实验室(筹)合肥230026 西安电子科技大学物理与光电工程学院西安710071

Molecular self-assembly is extremely important in many fields, but the characterization of their corresponding intermolecular interactions is still lacking. The C-H stretching Raman band can reflect the hydrophobic interactions during the self-assembly process of sodium dodecyl sulfate （SDS） in aqueous solutions. However, the Raman spectra in this region are seriously overlapped by the OH stretching band of water. In this work, vertically polarized Raman spectra were used to improve the detection sensitivity of spectra of C-H region for the first time. The spectral results showed that the first critical micelle concentration and the second critical micelle concentration of SDS in water were 8.5 and 69 mmol/L, respectively, which were consistent with the results given by surface tension measurements. Because of the high sensitivity of vertically polarized Raman spectra, the critical micelle concentration of SDS in a relatively high concentration of salt solution could be obtained in our experiment. The two critical concentrations of SDS in 100 mmol/L NaCl solution were recorded to be 1.8 and 16.5 mmol/L, respectively. Through comparing the spectra and surface tension of SDS in water and in NaCl solution, the self-assembly process in bulk phase and at interface were discussed. The interactions among salt ions, SDS and water molecules were also analyzed. These results demonstrated the vertically polarized Raman spectra could be employed to study the self-assembly process of SDS in water.

关键词： Vertically polarized Raman spectroscopy sodium dodecyl sulfate Self-assembly Critical micelle concentration Intermolecular interactions

Atomic force microscopy imaging of dialyzed single-walled carbon nanotubes dispersed with sodium dodecyl sulfate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2013年第2期4卷 119-127页

作者： Shigeyuki Hirayama Takuya Hayashida Kazuo Umemura Biophysics Section Department of PhysicsFaculty of ScienceTokyo University of Science1-3 KagurazakaShinjukuTokyo 1628601Japan

The existence of excess sodium dodecyl sulfate(SDS)molecules in a single-walled carbon nanotube(SWNT)solution dispersed by hybridization with SDS leads to unstable atomic force microscopy(AFM)*** this study,we demonstrate sequential dialysis against pure water in order to remove excess SDS molecules from an SDS-SWNT hybrid dispersion.A 1:102 volume ratio of SDS-SWNT dispersion to water in the dialysis was found to be effective in realizing stable AFM observations of the SDS-SWNT hybrids despite imperfect filtering of SDS via *** the other hand,the SDS-SWNT hybrids were stable even when this volume ratio was 1:***,the SDS-SWNT hybrids were present in the solution even when the dialyzed samples were stored for 14 *** results reveal that dialysis under optimal conditions enables improved handling of SDS-SWNT hybrids,particularly for stable AFM observations.

关键词： carbon nanotube atomic force microscopy sodium dodecyl sulfate dialysis

Phase Behavior of sodium dodecyl sulfate-n-Butanol-Kerosene-Water Microemulsion System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2014年第6期22卷 699-705页

作者：刘会娥张孝坤丁传芹陈爽齐选良 State Key Laboratory of Heavy Oil Processing China University of Petroleum

Experiments were carried out to investigate the influences of cation from electrolytes and acidity/alkalinity on the phase behavior of sodium dodecyl sulfate-n-butanol-organics-water （with electrolytes） microemulsion sys-tem. The organics used is commercial kerosene. The volume ratio of water to organics is 1︰1. The results show that the type and valence of electrolyte cations are important factors influencing the microemulsion behavior. Biva-lent Ca2＋is more effective than monovalent K＋and Na＋for the formation of Winsor type III and II microemulsion. For electrolytes with the same monovalent cation Na＋, i.e. NaCl and Na2CO3, anions in the electrolyte have some effect. Bivalent anion 23CO - leads to a lower activity of cation Na＋than monovalent anion Cl-. NaOH （or KOH） behaves similar with NaCl （or KCl）. When HCl is used as electrolyte, its acidity plays an important role. Phase in-version of microemulsion from type III （or II） to type I is observed through precipitation of Ca2＋using Na2CO3, neutralization of HCl by NaOH, and addition of water to the system, which releases the oil from the microemulsion.

关键词： microemulsion sodium dodecyl sulfate kerosene phase inversion