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Monitoring the spontaneous wetting process of hydrophobic microporous membrane assisted by alternating current impedance spectroscopy

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Chinese Journal of Chemical Engineering 2021年第11期34卷 96-102页

作者： Juntian Xiao Qian Sun liying liu Zhongwei Ding Beijing Key Laboratory of Membrane Science and Technology College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijing 100029China

In the process of membrane absorption,spontaneous wetting of hydrophobic microporous membrane causes membrane modification and increases membrane phase mass transfer resistance,which have attracted wide ***,due to the limitations of previous testing methods,the study of the spontaneous membrane wetting process is ***,we present a method for monitoring spontaneous membrane wetting by measuring its alternating current(AC)*** impedance tests of the PVDF flat membranes and hollow fiber membranes were conducted in a two-electrode *** results of equivalent circuit fitting indicate that the impedance value of the unwetted membrane is about 1.02×10^(10)Ω,which is close to the theoretical value of 1.4×10^(10)Ω,and this method can quantify the electrochemical impedance value of membranes with different degrees of spontaneous *** addition,a method of impedance test for real-time monitoring of spontaneous wetting was *** the experiment,the timeliness and continuity of this method are confirmed with exact judgment under different *** future work,the impedance data will be used to build model to predict the percentage of membrane wetting degree.

关键词： Alternating current impedance Spontaneous membrane wetting Hydrophobic membrane Dynamic monitoring

The electromagnetically induced transparency in the Y-type four-level atom system at low light levels

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Science China(Physics,Mechanics & Astronomy) 2005年第5期48卷 593-599页

作者： ZHANG liying liu Zhengdong CHEN Jun Institute of Modern Physics Nanchang University Nanchang 330047 China Institute of Modern Physics Nanchang University Nanchang 330047 China Institute of Modern Physics Nanchang University Nanchang 330047 China

In this paper a Y-type four-level atom interacting with external fields system is investigated. It is shown that increasing the control field can reduce the probe absorption, the electromagnetically induced transparency (EIT) and gain can be obtained if the parameters are taken appropriately. An interesting phenomenon is found that the system appears to be probe gain in a large region if the external fields Rabi phases are taken appropriately, too.

关键词： quantum optics, the nonlinear effect at low light levels, EIT, spontaneous emission, quantum interference.

Enzymatic hydrolysis of cellulose materials treated with ionic liquid [BMIM] Cl

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Chinese Science Bulletin 2006年第20期51卷 2432-2436页

作者： liu liying CHEN Hongzhang State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China

A new cellulose solvent ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) was used to treat wheat straw and steam-exploded wheat straw (SEWS) in order to improve the enzymatic hy- drolysis rates, while the water was used as the con- trol. The enzymatic hydrolysis results showed that the hydrolysis rates of materials treated with [BMIM]Cl were improved. The hydrolysis rate of treated wheat straw could reach 70.37% and the SEWS could be completely hydrolyzed, while hydrolysis rates of the wheat straw and SEWS treated with water were 42.78% and 68.78% under the same conditions, re- spectively. The FTIR analysis and polymerization degree measurement indicated that the hydrolysis rates improvement was attributed to the decrease of the polymerization degrees of cellulose and hemi- cellulose, the absolute crystallinity degree of cellu- lose and the increase of its reaction accessibility.

关键词：纤维素材料离子性液体丁基氯化物酶水解 FTIR 生化工程

Preparation of SiO_2 microspheres with sodium ions and self-assembly of photonic crystals

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Chinese Science Bulletin 2010年第8期55卷 766-770页

作者： liu liying WANG XiuFeng ZHANG ChunXiang CHENG Bing School of Materials Science and Engineering Shaanxi University of Science and Technology Xi' an 710021 China

SiO2 microspheres were prepared via a novel co-precipitation *** Na + ions were introduced by adding sodium chloride and metal sodium in solution systems for improving surface charge of the SiO2 *** then SiO2 photonic crystals were fabricated by the vertical deposition *** electrical properties,micromorphology and optical properties were characterized by zeta potential instrument,scanning electron microscope (SEM) with energy dispersive X-ray spectroscopy and Uv-Vis-Nir *** potential of the SiO2 microspheres modified by sodium chloride and metal sodium were averagely heightened 11.39 mV and 13.52 mV respectively in ethanol *** spectra showed that there was Na element in the SiO2 *** images showed that the average size of the SiO2 microspheres modified by sodium chloride and metal sodium were 380 nm and 354 nm respectively,larger than that of the unmodified ones,and their distribution standard deviation was less than 5%,and the sample of SiO2 photonic crystals was face-centered cubic structure with their (111) planes parallel to the *** addition,absorption spectra showed that photonic band gap of the SiO2 photonic crystals was modified by sodium chloride and metal sodium located in 856 nm and 798 nm ***,their absorption peaks became narrower and higher and exhibited a red-shift phenomenon.

关键词：二氧化硅微球光子晶体钠离子自我组装制备扫描电子显微镜红外分光光度计 X射线光谱

THE CONVERGENCE OF A NEW MODIFIED BFGS METHOD WITHOUT LINE SEARCHES FOR UNCONSTRAINED OPTIMIZATION OR COMPLEXITY SYSTEMS

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Journal of Systems Science & Complexity 2010年第4期23卷 861-872页

作者： liying liu Zengxin WEI Xiaoping WU College of Mathematics Science Liaocheng University Liaocheng 252059 China College of Mathematics and Information Science Guangxi University Nanning 530004 China School of Management Xi'an Jiaotong University Xi'an 710049 China

In this paper,a new modified BFGS method without line searches is *** traditionalBFGS method,this modified BFGS method is proposed based on the so-called fixed steplengthstrategy introduced by Sun and *** some suitable assumptions,the global convergence andthe superlinear convergence of the new algorithm are established,*** some preliminarynumerical experiments,which shows that the new Algorithm is feasible,is also reported.

关键词： BFGS method complexity systems global convergence superlinear convergence unconstrained optimization.

Three-dimensional hierarchical Ca_(3)Co_(4)O_(9) hollow fiber network as high performance anode material for lithium-ion battery

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Science China(Technological Sciences) 2021年第3期64卷 673-679页

作者： GUAN ShouJie FAN QingLu liu liying LUO JunCai ZHONG YiCheng ZHAO WeiMin HUANG ZhenCai SHI ZhiCong Smart Energy Research Centre School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Guangdong Engineering Technology Research Center for New Energy Materials and Devices Guangzhou 510006China College of Chemical Engineering and Safety Binzhou UniversityBinzhou 256503China Hangzhou LIAO Technology Co. Ltd.Hangzhou 310000China

Transition metal oxides have high specific capacity as anode materials for lithium-ion *** aggregation of particles and volume expansion during lithiation/delithiation restrict their *** this work,a three-dimensional hierarchical Ca_(3)Co_(4)O_(9)hollow fiber network assembled by nanosheets is prepared by an electrospinning combined with heat treatment method to overcome these issues and to boost its lithium storage ***-synthesized sample possesses excellent cyclic stability(578.6 m A h g^(-1)at 200 m A g^(-1)after 500 cycles)and rate performance(293.5 m A h g^(-1)at 5000 m A g^(-1)),much better than those of commercial Co_(3)***,the fast kinetics of the three-dimensional Ca_(3)Co_(4)O_(9)hollow fiber network is also confirmed by the variable scan rates CV tests and the EIS measurements,which is dedicated to the specific hierarchical hollow fiber network structure that provides shorter ion transport distances and higher electrical *** work supplies a universal approach to improve the electrochemical performance of transition metal oxides for lithium ion batteries.

关键词： lithium ion battery anode material cobalt oxides electrospinning hierarchical structure

The critical role of inorganic nanofillers in solid polymer composite electrolyte for Li+transportation

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Carbon Energy 2021年第3期3卷 482-508页

作者： Zhichuan Shen Yifeng Cheng Shuhui Sun Xi Ke liying liu Zhicong Shi School of Materials and Energy Guangdong University of TechnologyGuangzhouChina Guangdong Engineering Technology Research Center for New Energy Materials and Devices GuangzhouChina Energie Materiaux et Telecommunications Center Inst itut National de la Recherche Scientifique(INRS)QuebecCanada

Compared with commercial lithium batteries with liquid electrolytes,all-solidstate lithium batteries(ASSLBs)possess the advantages of higher safety,better electrochemical stability,higher energy density,and longer cycle life;therefore,ASSLBs have been identified as promising candidates for next-generation safe and stable high-energy-storage *** design and fabrication of solid-state electrolytes(SSEs)are vital for the future commercialization of *** various SSEs,solid polymer composite electrolytes(SPCEs)consisting of inorganic nanofillers and polymer matrix have shown great application prospects in the practice of *** incorporation of inorganic nanofillers into the polymer matrix has been considered as a crucial method to achieve high ionic conductivity for *** this review,the mechanisms of Li+transport variation caused by incorporating inorganic nanofillers into the polymer matrix are discussed in *** the basis of the recent progress,the respective contributions of polymer chains,passive ceramic nanofillers,and active ceramic nanofillers in affecting the Li+transport process of SPCE are reviewed *** inherent relationship between the morphological characteristics of inorganic nanofillers and the ionic conductivity of the resultant SPCE is ***,the challenges and future perspectives for developing high-performance SPCE are put *** review aims to provide possible strategies for the further improvement of ionic conductivity in inorganic nanoscale filler-reinforced SPCE and highlight their inspiration for future research directions.

关键词： all-solid-state lithium batteries inorganic nanofillers Li+transportation solid polymer composite electrolyte

Sensitivity enhancement of guided mode resonance sensors under oblique incidence

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Photonics Research 2024年第11期12卷 2667-2675页

作者： LIANG GUO LEI XU liying liu Key Laboratory for Micro and Nanophotonic Structures (Ministry of Education) Department of Optical Science and EngineeringSchool of Information Science and Engineering Fudan University

The sensitivity of guided mode resonance (GMR) sensors is significantly enhanced under oblique incidence. Here in this work, we developed a simplified theoretical model to provide analytical solutions and reveal the mechanism of sensitivity enhancement. We found that the sensitivity under oblique incidence consists of two contributions, the grating sensitivity and waveguide sensitivity, while under normal incidence, only waveguide sensitivity exists. When the two contributions are constructively superposed, as in the case of positive first order diffraction of the grating, the total sensitivity is enhanced. On the other hand, when the two parts are destructively superposed, as in the case of negative first order diffraction, the total sensitivity decreases. The findings are further supported by FDTD numerical calculations and proof-of-concept experiments.?2024 Chinese Laser Press

关键词： Diffraction gratings Effective refractive index Holographic gratings Total internal reflection Waveguide gratings Waveguide modes

Autophagy as new emerging cellular effect of nanomaterials

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Chinese Science Bulletin 2013年第33期58卷 4031-4038页

作者： ZHONG WenYing Lü Min liu liying SUN JinLi ZHONG ZengTao ZHAO Yun SONG HaiYun School of Life Science Sichuan University Institute for Nutritional Sciences Shanghai Institutes for Biological Sciences College of Life Sciences Nanjing Agricultural University

The biosafety issue of nanoscale materials is getting more and more attention with their increasing manufacture and *** the research of cellular effects and underlying mechanisms related to toxicity of nanomaterials,most emphasis were placed on processes such as apoptosis,metabolic inhibition and oxidative *** evidence suggests that autophagy is part of the biological effects by nanomaterials and various kinds of nanomaterials are capable of disturbing the autophagic *** review will highlight the importance of autophagy as an emerging mechanism of nanomaterial toxicity and the implication in the therapy of autophagy-related *** summarize current research status of interaction between nanomaterials and autophagic *** is of note that nanomaterials can either induce or block autophagy,which result in similar phenotype but completely different biological *** is therefore important to perform comprehensive analysis of the whole autophagic flux in the future research.

关键词：纳米材料自噬作用细胞效应生物效应安全问题细胞凋亡氧化应激疾病治疗