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Reshaping the imprinting strategy through the thermo-responsive moiety-derived“deep eutectic solvents”effect

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Chinese chemical Letters 2024年第1期35卷 441-445页

作者： Huihuang Xiong yiqun Wan Yong fan Mengjia xu Aiping Yan Yushan Zhang Qifei Jiang Hao Wan state key laboratory of Food Science and technology Nanchang UniversityNanchang 330047China School of chemistry and chemical engineering Nanchang UniversityNanchang 330031China Jiangxi Province key laboratory of Modern Analytical Science Nanchang UniversityNanchang 330031China Department of Computer Science University of California IrvineIrvine 92697United States

As a new concept having emerged in last few years,the“deep eutectic solvents”(DESs)effect integrated into the imprinting technology inevitably exposes design limitations of stimuli-responsive molecularly imprinted polymers(MIPs),as well as inadequate analysis of the adsorption performance of ***,a simple yet defined N-isopropylacrylamide/(3-acrylamidopropyl)trimethylammonium chloride(NIPAM/APTMAC)binary DESs system was proposed to prepare intelligent MIPs with ***,magnetic and thermo-responsive MIPs based on functional monomers-derived DESs(TMDESs-MIPs1)were synthesized,revealing DESs effect-regulated affinity/kinetics for the enhanced adsorption capability,eco-friendly thermo-regulated elution for high release efficiency,and simple magnetic separation,along with superior selectivity to rhein(RH)and good regeneration ***-DESs-MIPs1 were utilized to extract RH from Cassiae semen samples coupled with high performance liquid chromatography(HPLC),yielding satisfactory recoveries(79.47%−110.82%)and low limits of detection(LOD)(16.67μg/L).Another two kinds of MIPs adopting the thermo-responsive moiety-derived DESs effect strategy further demonstrated great applicability of such intelligent MIPs for analyses of complicated samples.

关键词： Deep eutectic solvents Molecularly imprinted polymers Magnetic Thermo-responsive Thermo-regulated elution

Preparation and Characterization of Alumina Membranes on Capillary Supports： Effect of Film-coating on Crack-free Membrane Preparation

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Chinese Journal of chemical engineering 2010年第3期18卷 377-383页

作者：朱瑾范益群徐南平 state key laboratory of materials-oriented chemical engineering College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing 210009 China

Ceramic capillary membrane has received much attention due to its relatively high pack density and favorable mechanical ***,it is difficult to prepare capillary membrane on its thin support by a dip-coating *** this study,alumina microfiltration membranes were prepared on the inner surface of alumina capillary support(outer diameter 4 mm,inner diameter 2.5 mm)by a dip-coating *** electron microscopy(SEM)observation,gas bubble pressure(GBP)method and membrane permeation test were carried out to evaluate membrane *** major effects in preparation of crack-free membrane,capillary filtration and film-coating,upon the thin support were *** as-prepared crack-free membrane presents a narrow pore size distribution,a mean pore size of about 0.6μm and a high pure water flux of 86000 L·m -2 ·h -1 ·*** is proved that the membrane thickness should be sufficiently large to overcome the defects of support surface,but it is only one of the prerequisites for the formation of crack-free ***,it is demonstrated that the capillary filtration effect is greatly restricted for thin capillary support with the dip-coating method and the film-coating effect plays a crucial role in the formation of crack-free membrane.

关键词： capillary film coating dip-coating ceramic membrane

Effects of Sintering Atmosphere on the Microstructure and Surface Properties of Symmetric TiO2 Membranes

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Chinese Journal of chemical engineering 2009年第5期17卷 739-745页

作者：周守勇仲兆祥范益群徐南平贺跃辉 state key laboratory of materials-oriented chemical engineering College of Chemistry and Chemical Engi neering Nanj ing University of Technology Nanjing 210009 China state key laboratory for Powder Metallurgy Central South University Changsha 410083 China

The effects of sintering atmosphere on the properties of symmetric TiO2 membranes are studied with regard to sintering behavior, porosity, mean pore size, surface comPosition. and surface charge properties. The exerimental results show that the symmetric TiO2 membranes display better sintering activity in the air than in argon, and the mean pore diameters and porosities of the membrane sintered in argon are higher than those of the membrane sintered in the air at the same temperature. The surface compositions of the symmetric TiO2 membrane sintered in the air and in argon at different temperatures, as studied by X-ray photoelectron spectroscopy, are discussed in terms of their chemical composition, with particular emphasis on the valence state of the titanium ions. The correlation between the valence state of the titanium ions at the surface and the surface charge properties is *** is found that the presence of Ti^3＋, introduced at the surface of the symmetric TiO2 membranes by sintering in a lower partial pressure of oxygen, is related to a significant decrease in the isoelectric point. TiO2 with Ti^4＋ at the interface has an isoelectric point of 5.1, but the non-stoichiometric TiO2-x with Ti^3＋ at the interface has a lower isoelectric point of 3.6.

关键词： TiO2 membrane sintering atmosphere sintering behavior surface microstructure