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Determination of physical properties for the mixtures of [BMIM]Cl with different organic solvents

Chinese Journal of Chemical Engineering 2015年第5期23卷 804-811页

作者： hina saba Xinjun Zhu Ye Chen Yumei Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University Department of Material and Engineering Luoyang Institute of Science and Technology

Physical properties including refractive index, density, viscosity and conductivity for binary mixtures of 1-butyl-3-methyl imidazolium chloride([BMIM]Cl) and different organic solvents at 298.15 K have been investigated. Excess molar volumes have been calculated and obtained data has been fitted by the Redlich–Kister equation. The density and refractive index were found to increase with increasing concentration of [BMIM]Cl, however, exceptions do exist as in the case of dimethyl sulfoxide(DMSO)/[BMIM]Cl. For DMSO/[BMIM]Cl, the density decreases with increasing concentration. The addition of different organic solvents was able to disrupt the interactions within mixtures, leading to free mobility of ions. The free mobility of ions has been found to enhance conductivity and decrease viscosity to varying extents in all mixtures studied. It has been observed that solubility parameters,dielectric constants and composition of the solvents used play a vital role in determining the resultant *** data obtained will play an important role in understanding the effect of the addition of organic solvents in ILs to enhance their applicability.

关键词：二元混合物有机溶剂 Cl 物理性能测定 DMSO 浓度增加自由离子

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Voltammetric Behavior of 1,4-Dimethoxypillar[m]arene[n]quinones

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Chinese Journal of Chemistry 2016年第9期34卷 861-865页

作者： hina saba Jianggen An Yong Yang Min Xue Yongsong Liu School of Science Zhejiang Sci-Tech University Hangzhou Zhejiang 310018 China

The electrochemical properties of a series of 1,4-dimethoxypillar[m]arene[n]quinones （DMP[m]A[n]Qs） and the interactions between individual quinone units have been investigated on glassy carbon electrode in acetonitrile. All the quinone units showed relative electron uptake behavior except 1,4-dimethoxypillar[5]quinones （DMP[5]Q）. The results have shown that the electrochemical behavior of the DMP[m]A[n]Qs is comparatively different from that of their related linear quinone analogues. The resultant properties were attributed to the close proximity of redox-active sites as well as the delocalization of electrons on the aromatic rings. Another aspect to be considered responsible for their electronic properties was suggested to be the electrostatic repulsions between adjacent quinone units in these complex structures. Current studies provide a better understanding on the voltammetric behavior of pillararene derivatives with different numbers of quinone units as well as their future scope in certain future electrochemical applications.

关键词： pillararenes pillarquinones cyclic voltammetry

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Physical Properties of [AMIM] Cl with Different Organic Solvents to Account for Underlying Interactions

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Journal of Donghua University(English Edition) 2015年第3期32卷 406-410页

作者： saba hina 张玉梅王华平 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University

In order to understand the interactions of the mixtures of ionic liquids with different organic solvents,density,conductivity and refractive index have been investigated for binary mixtures of 1-allyl-3-methyl-imidazolium chloride( [AMIM]Cl) with acetonitrile,ethanol,and dimethyl sulfoxide( DMSO) at 298. 15 K. Density and refractive index were found to increase with increasing [AMIM]Cl concentration. Conductivity was found to increase initially by the addition of [AMIM]Cl. However,as the amount of [AMIM]Cl increases,a gradual decrease in conductivity of the mixtures has been observed. The resultant properties were caused by subsequent ion-ion and / or ion-solvent interactions depending on the extent of polarity,dielectric constants and miscibility of organic solvents being used.

关键词： ionic liquid mixtures density refractive index conductivity interactions

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Antibacterial Behavior of Laser-Ablated Copper Nanoparticles

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Acta Metallurgica Sinica(English Letters) 2016年第8期29卷 748-754页

作者： hina khalid shamaila shamaila nosheen zafar rehana sharif jawad nazir mohammad rafique sheeba ghani hussain saba Department of Physics University of Engineering and Technology Department of Microbiology University of Veterinary and Animal Sciences

Copper nanoparticles（Cu NPs） have been synthesized by using laser ablation method,using deionized water as main *** formation of Cu NPs is confirmed by UV-visible spectrophotometer（UV-Vis）,atomic force microscopy（AFM） and X-ray diffraction（XRD）.Cu NPs fabricated by laser ablation have diameter in the range from 14 to 55 *** analysis revealed the face-centered cubic（fcc） crystal structure of Cu *** antibacterial activity of Cu NPs has been evaluated in vitro against strains of Escherichia coli（***） and Staphylococcus aureus（***）.The fabricated Cu NPs show considerable antibacterial activity against both bacterial *** bacterial activity of Cu NPs was found to depend on the microbial species.

关键词： Laser-ablated nanoparticles UV-visible spectrophotometer Atomic force microscopy(AFM) Escherichia coli Staphylococcus aureus

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