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Cover and Content of Chemical Journal of Chinese Universities Vol.44 No.6(2023) Chem. J. Chinese Universities    2023, 44 (6): 1-6.   Abstract （156）      PDF（pc） （53746KB）（1856）       Knowledge map    Save Related Articles | Metrics

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Simultaneous Capillary Electrophoretic Analysis of Flavonoids and Phenolic Acids in Plants Kyoung Rae Kim, Saanglim Ryu, Sookie La, Jung Han Kim, Sangjun Lee Chem. J. Chinese Universities    1999, 20 (S1): 224-224.   Abstract （329）      PDF（pc） （39KB）（1866）       Knowledge map    Save An efficient capillary electrophoretic method is described for the simultaneous determination of hydroxylated and methoxylated flavonoids and phenolic acids present in plant extracts. The separation of samples injected in pressure injection mode was carried out using fused silica capillary in boric acid buffer (alkaline pH) containing SDS as pseudostationary phase and methanol as organic modifier with direct UV detection at 220nm. Related Articles | Metrics

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Cover and Content of Chemical Journal of Chinese Universities Vol.42 No.6(2021) Chem. J. Chinese Universities    2021, 42 (6): 1-12.   Abstract （203）      PDF（pc） （15590KB）（1674）       Knowledge map    Save Related Articles | Metrics

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Synthesis and Characterization of Full Concentration-gradient LiNi0.643Co0.055Mn0.302O2 Cathode Material for Lithium-ion Batteries LUO Man, JIANG Wenquan, HAN Xue, GUO Ronggui, LI Tao, YU Limin Chem. J. Chinese Universities    2018, 39 (1): 148-156.   DOI: 10.7503/cjcu20170198 Abstract （1043）   HTML （12）    PDF（pc） （4580KB）（1563）       Knowledge map    Save The “two-step” method was adopted to realize the continuous gradient change of feed concentration and the gradient design of final material was derived from mathematical calculus formula. The full concentration-gradient precursor was prepared via co-precipitation method and technique of “Tubular synthesis”. The final lithiated cathode material was obtained by calcination of the mixture of as-obtained full concentration-gradient precursor and 6.5% excess LiOH·H2O in oxygen, whose average chemical compositions was LiNi0.643Co0.055Mn0.302O2 analyzed by inductively coupled plasma-atomic emission spectrometry(ICP-AES). The LiNi0.643Co0.055Mn0.302O2 particle was nearly spherical and had the size of 5 μm in diameter with narrow particle size distribution and its tap-density was approximately 2.029 g/cm3. A well-ordered α-NaFeO2 layer-structured LiNi0.643Co0.055Mn0.302O2 was confirmed by Rietveld refinement of X-ray diffraction(XRD), in which the lattice parameters were a=0.2877(5) nm, c=1.4242(24) nm, V=0.102088(31) nm3, respectively. Energy dispersive spectrometory(EDS) and element mapping results verified that the concentration of Ni, Co and Mn changed gradually inside out of the particle. LiNi0.643Co0.055Mn0.302O2 delivered an initial discharge capacity of 187.68 mA·h ·g-1 and coloumbic efficiency of 84.76%. After cycling at 1C rate for 200 cycles, the discharge capacity and capacity retention of LiNi0.643Co0.055Mn0.302O2 were 146.45 mA·h ·g-1 and 86.90%, respectively. Table and Figures | Reference | Related Articles | Metrics

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Two-dimensional Materials for Osmotic Energy Conversion XIN Weiwen, WEN Liping Chem. J. Chinese Universities    2021, 42 (2): 445-455.   DOI: 10.7503/cjcu20200605 Abstract （843）   HTML （37）    PDF（pc） （14158KB）（1545）       Knowledge map    Save Osmotic energy conversion， the extraction of power from the salt difference between river water and seawater， is a crucial way to solve the energy crisis in future. Osmotic energy attracts extensive attention and research due to its huge reserves， easy accessibility， and sustainability. Ion-exchange membrane is a key component in reverse electrodialysis（RED） technology for osmotic energy conversion， which immensely impacts the performance of osmotic energy conversion. Two-dimensional（2D） materials such as graphene， graphene oxide， molybdenum disulfide， various frame materials and their functionalized composites have become prospective materials for harvesting osmotic energy on account of their excellent ion selective transport， nanoscale pores or channels， abundant functional groups， and modifiability. In this review， we summarize the types of 2D materials as ion transport channels and their corresponding transport mechanisms. Furthermore， we also discuss the current state of the art in designs and show the applications of 2D materials and their composites in osmotic energy conversion. Finally， we overview the challenges of 2D materials in osmotic energy conversion and propose future directions of research. Table and Figures | Reference | Related Articles | Metrics

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Advanced Progress of Green Textile with Special Wettability LI Shuhui, HUANG Jianying, LAI Yuekun Chem. J. Chinese Universities    2021, 42 (4): 1043-1060.   DOI: 10.7503/cjcu20200646 Abstract （878）   HTML （42）    PDF（pc） （37440KB）（1529）       Knowledge map    Save We introduced the preparation mechanism of biomimetic superhydrophobic surfaces and the development of hydrophobic finishing chemicals. The research process of multi-functional green textile with special wettability in the last 10 years was systematically reviewed. The preparation technologies and applications in double-superhydrophobic， asymmetric superhydrophobic/superhydrophilic janus surface， patterned/ stimulated responsive surface were discussed. The prospective works were emphasised in this review， including self-cleaning， oil/water separation， durable mechanical surfaces， patterning， self-healing， one-way transportation， especially in some emerging fields such as smart response， wearable electronics， energy- harvesting. The summary and outlook of superhydrophobic and multi-funtional textile were also demonstrated at last. Table and Figures | Reference | Related Articles | Metrics

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Recent Advances in Metal-organic Framework Derived Hollow Superstructures： Synthesis and Applications ZOU Yingying, ZHANG Chaoqi, YUAN Ling, LIU Chao, YU Chengzhong Chem. J. Chinese Universities    2023, 44 (1): 20220613-.   DOI: 10.7503/cjcu20220613 Abstract （381）   HTML （29）    PDF（pc） （27446KB）（970）       Knowledge map    Save Rational design of metal-organic framework（MOF） derived functional materials with elaborate structures is of great significance for diverse applications. Assembly of simple MOF derivatives as building blocks into hollow superstructures（HSSs） represents a promising strategy for creating higher-order structures with improved performance. Even many excellent reviews on MOF derivatives have been reported， a dedicated review from the angle of synthesis and applications of HSSs is still lacking. Here we provide a timely and systematic review on the recent advances of MOF derived HSSs. Firstly， five types of MOF derived HSSs are classified according to their architectural features. Then， the synthesis strategies for creating HSSs from MOF derivatives are summarized， with an emphasis on how to design MOF precursors and select conversion conditions. Afterwards， the promising applications of MOF derived HSSs in energy and catalysis related fields are highlighted. Finally， our perspectives on challenges and future opportunities in MOF-derived HSSs are presented， aiming to provide guidance for the design of advanced MOF derivatives with intricate structures and enhanced properties. Table and Figures | Reference | Related Articles | Metrics

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Colloidal Lithography——Construction and Application of Nanostructured Surfaces ZHANG Gang*, ZHAO Zhi-Yuan, WANG Da-Yang Chem. J. Chinese Universities    2010, 31 (5): 839-854.   Abstract （4093）      PDF（pc） （11337KB）（11719）       Knowledge map    Save Combining “top-down” patterning with “bottom-up” self-assembly as template colloidal lithography provides a unique patterning strategy. Spontaneous formation of well-ordered colloidal arrays provides lithographic masks or scaffolds for creating useful patterns. Based on self-assembly of colloidal spheres as template, the controlled “positive” deposition of nanoparticles and “negative” etching processes could be used for the fabrication of nanostructured materials, ranging from several tens of nanometers to micrometer scales for 2D and 3D ordered architectures. The feature size can easily shrink below 100 nm by reducing the diameter of the microspheres used according to the simple correlation between the interstice size and the sphere diameter. The feature shape can be easily diversified by the crystalline structure of a colloidal crystal mask, the time of anisotropic etching of the mask, the incidence angle of the vapor beam and the mask registry. Colloidal lithography provides a complementary tool for conventional and fully “top-down” lithographic techniques, and thus holds immense promise in surface patterning. They show versatility applications such as biosensors or chemosensors using for detection tool. Colloidal lithography is also suitable for modifying surface properties which is useful for emerging applications in biotechnology and chemically and structurally designed interactive sites for the attachment. Reference | Related Articles | Metrics

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Hydrogel-based Bioinspired Ion Channels： Fabrication and Controllable Ion Transport CHEN Weipeng, KONG Xiangyu, WEN Liping Chem. J. Chinese Universities    2023, 44 (6): 20220772-.   DOI: 10.7503/cjcu20220772 Abstract （580）   HTML （39）    PDF（pc） （14959KB）（775）       Knowledge map    Save The controllable ion transport is the basis of most physiological activities， such as the transmission of neural signals， the perception of external stimuli， etc. The key to realize the controllable ion transport is the various protein ion channels in life system. Inspiring researchers endeavor to develop artificial ion channels to subtly tune the ion transportation. Among the developed ion channels， hydrogel-based system exhibits the advantages of high ion selectivity and high ion conductance due to its three-dimensional（3D） charged networks induced space charges and 3D interconnection channels. As hydrogel-based ion channels hold the biocompatibility， deformability， and stable ion storage properties， it has been the focus in intelligence ion transport field and shows great potential in ion electronic circuits， medical health， energy conversion and storage， resources， and environment. To summarize the latest development of the hydrogel-based ion channels， we firstly overview on the construction methods of hydrogel-based intelligent ion channels. Thereafter， the ion transport mechanisms in the hydrogel-based ion channels are summarized， and the applications of such ion channels are categorized. At last， we discuss the existed issues and give the perspective on future development of hydrogel-based ion channels. Table and Figures | Reference | Related Articles | Metrics

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Synthesis and Electrochromic Performance of Phosphazene-viologen Polymer † SUN Mengying,Lü Jingchun,XU Hong,ZHANG Linping,ZHONG Yi,CHEN Zhize,SUI Xiaofeng,MAO Zhiping Chem. J. Chinese Universities    2020, 41 (6): 1399-1406.   DOI: 10.7503/cjcu20190541 Abstract （1150）   HTML （26）    PDF（pc） （4617KB）（983）       Knowledge map    Save Electrochromic materials have attracted considerable attention due to their versatile applications in academic and industrial areas. In this work, a novel organic-inorganic hybrid electrochromic material(denoted as PHV 2+) was synthesized, which contains six viologen moieties and a hexachlorocyclotriphosphazene core. The structure of the polymer was characterized by Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) and nuclear magnetic resonance. The water solubility makes it possible to construct an electrochromic hydrogel with polyvinyl alcohol by a simple method, which has the advantages of low cost and no toxicity. The electrochromic device made of this polymer exhibits good electrochromic properties with good cyclic stability. The device undergoes a noticeably yellowish-purple color change at a voltage of 2.1 V. The optical contrast of the device is 62.19% at 526 nm. This electrochromic polymer shows its potential in electrochromic application. Table and Figures | Reference | Related Articles | Metrics

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Cover and Content of Chemical Journal of Chinese Universities Vol.44 No.9(2023) Chem. J. Chinese Universities    2023, 44 (9): 1-6.   Abstract （2）      PDF（pc） （18959KB）（704）       Knowledge map    Save Related Articles | Metrics

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Research Progress of Polyoxometalates-Cyclodextrin Supramolecular System WEI Zheyu, WU Zhikang, RU Shi, NI Lubin, WEI Yongge Chem. J. Chinese Universities    2022, 43 (1): 20210665-.   DOI: 10.7503/cjcu20210665 Abstract （882）   HTML （36）    PDF（pc） （6367KB）（935）       Knowledge map    Save This paper reviewed representative work on cyclodextrin-based polyoxometalates supramolecular systems in recent years. Based on the structural types of different polyoxometalates in the polyoxometalates/cyclodextrin supramolecular complex， the corresponding induction and overview were carried out. It is hoped that this paper can arouse readers’ interest in the research of polyoxometalate/cyclodextrin supramolecular system， and provide some new ideas and inspiration for researchers. Table and Figures | Reference | Related Articles | Metrics

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有机太阳能电池专刊 李永舫, 陈红征, 朱晓张, 何凤 Chem. J. Chinese Universities    2023, 44 (9): 1-4.   Abstract （256）      PDF（pc） （1427KB）（697）       Knowledge map    Save Related Articles | Metrics

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Preparation and Applications of Stretchable and Tough Hydrogels † SHENG Hui, XUE Bin, QIN Meng, WANG Wei, CAO Yi Chem. J. Chinese Universities    2020, 41 (6): 1194-1207.   DOI: 10.7503/cjcu20190656 Abstract （2572）   HTML （201）    PDF（pc） （5703KB）（2122）       Knowledge map    Save In this review, we focus on the design principle of stretchable and tough hydrogels as well as the applications in the fields of tissue engineering and flexible electronic devices. Through connecting hydrogel network structures, toughening mechanisms and chemical structures with macroscopic mechanical properties, we mainly discussed the research progress of single network hydrogel, double network hydrogel, nanocomposite hydrogel and so on. The summary and outlook of the new ideas and directions of stretchable and tough hydrogels were also demonstrated at last. Table and Figures | Reference | Related Articles | Metrics

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Research Progress of Photo-driven C1 Conversion to Value-added Chemicals † LI Zhenhua, SHI Run, ZHAO Jiaqi, ZHANG Tierui Chem. J. Chinese Universities    2020, 41 (4): 604-615.   DOI: 10.7503/cjcu20190641 Abstract （1124）   HTML （57）    PDF（pc） （5941KB）（1141）       Knowledge map    Save We summarized recent progresses of photo-driven C1 chemistry. Latest researches on photo-driven Fischer-Tropsch synthesis, Water-Gas shift, carbon dioxide hydrogenation, methane reforming, and methanol reforming for hydrogen production were systematically reviewed. In addition, the existing problems as well as prospects were also proposed in the research field. Table and Figures | Reference | Related Articles | Metrics

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Small Molecule Adsorption and Separation on Zeolites LIU Shanshan, CHAI Yuchao, GUAN Naijia, LI Landong Chem. J. Chinese Universities    2021, 42 (1): 268-288.   DOI: 10.7503/cjcu20200458 Abstract （1773）   HTML （68）    PDF（pc） （14584KB）（1829）       Knowledge map    Save Adsorptive separation， the process of separating and purifying a gas mixture via the selective adsorption of one or more components on a porous solid adsorbent， is of great significance in industry. Zeolites， metal-organic framework materials and activated carbon are known as common solid adsorbents. Zeolites show significant advantages such as high specific surface area， high stability and low production cost to satisfy the requirements of highly efficient， energy-saving and environmentally friendly adsorptive separation processes. Therefore， zeolites have been established as most promising adsorbents for the separation of small molecules. In this review article， the existing materials， the fundamental mechanisms and the evaluation methods in adsorptive separation are firstly outlined. The applications of zeolites in air separation， hydrocarbon separation， carbon dioxide capture， aromatic sulfide removal， carbon monoxide adsorption， nitrogen oxides adsorption， hydrogen storage and hydrogen isotope separation are then summarized. Finally， the current status of small molecule separation based on zeolite membranes are briefly discussed. The relationship between the adsorption performance and the topology， framework composition， and modification methods of zeolites are focused， and the future research prospects are discussed on the basis of current achievements. Table and Figures | Reference | Related Articles | Metrics

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Cover and Content of Chemical Journal of Chinese Universities Vol.44 No.10(2023) Chem. J. Chinese Universities    2023, 44 (10): 1-6.   Abstract （207）      PDF（pc） （23330KB）（549）       Knowledge map    Save Related Articles | Metrics

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Photocatalytic Application of Covalent Organic Frameworks LI Li, LI Pengfei, WANG Bo Chem. J. Chinese Universities    2020, 41 (9): 1917-1932.   DOI: 10.7503/cjcu20200409 Abstract （3041）   HTML （214）    PDF（pc） （12359KB）（1983）       Knowledge map    Save Covalent organic frameworks(COFs) are crystalline porous organic materials, which are built from organic building blocks through covalent bonds. COFs have the characteristics of well-defined pore structure and high specific surface area. COFs have been widely used in gas storage and separation, catalysis, sensing, energy storage, photoelectric conversion and many other fields. Introducing organic building blocks with adjustable light absorption into COFs provide COF with a great potential in photocatalysis. In recent years, COFs have developed rapidly in the field of photocatalysis. This paper summarizes the recent progress of COFs in the fields of photocatalytic hydrogen production, photocatalytic carbon dioxide reduction, photocatalytic organic reactions, and photocatalytic degradation of pollutants, and looks forward to its further prospects in the field of photocatalysis. Table and Figures | Reference | Related Articles | Metrics

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Molecular Probe for the Determination of Hydroxyl Radicals in Heterogeneous Systems: Coumarin† HAN Ruixia,LÜ Jitao,ZHANG Shuzhen Chem. J. Chinese Universities    2018, 39 (12): 2658-2664.   DOI: 10.7503/cjcu20180364 Abstract （3687）   HTML （71）    PDF（pc） （2894KB）（1210）       Knowledge map    Save Three common molecular probes—disodium terephthalate(TPA), sodium benzoate(BA) and coumarin(COU), with the corresponding transformation products of which are 2-hydroxyterephthalic acid(hTPA), salicylic acid(SA) and 7-hydroxycoumarin(7-hCOU) were assessed, respectively. The results showed that transformation products of TPA and BA were adsorbed seriously on ferrihydrite(the maximum adsorption capacity were 2.49 and 2.09 mg/g, respectively), which made them unsuitable to be used in heterogeneous systems. Moreover, COU was much better than TPA and BA in terms of sensitivity, linearity and concentration range responded to ·OH. And 7-hCOU had lower limit of detection than hTPA and SA(0.005, 0.046 and 0.072 μmol/L, respectively). COU was further demonstrated to be capable of quantifying ·OH produced in microbe-mineral systems and soil and sediment systems during redox cycle, where it showed great stability and reproducibility. It proved to be a reasonable molecular probe to apply to other ·OH production processes in heterogeneous systems and natural environment. Notably, it should be in the same pH buffer when comparing ·OH concentration between different systems since the pH has a great influence on the ·OH production. Table and Figures | Reference | Related Articles | Metrics

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Visible Light-driven Carboxylation with CO2 ZHANG Zhen, DENG Yu, ZHANG Qinfang, YU Dagang Chem. J. Chinese Universities    2022, 43 (7): 20220255-.   DOI: 10.7503/cjcu20220255 Abstract （1422）   HTML （79）    PDF（pc） （11197KB）（980）       Knowledge map    Save Carbon dioxide（CO2） is not only a well-known greenhouse gas but also one important C1 resource. It is very important to realize organic transformations with CO2 to generate high value-added compounds. Given the importance of carboxylic acid and derivatives which are widely found in natural products， medicines， daily chemicals and industrial raw materials， the synthesis of carboxylic acids with CO2 has become an important research direction. On the other hand， high temperature and other harsh conditions are always required in this field due to the low reactivity of CO2. To solve such problems， visible light is used as an clean energy source to drive the effective transformations of CO2， which has been developed significantly in last few years. This review mainly introduced and summarized the visible light-driven carboxylation with CO2 in recent years， and classified them according to types of important chemical raw materials， such as alkenes， alkynes， aldehydes and ketones， imines organo（pseudo）halides and others. The characteristics and mechanisms of each reaction were discussed. In addition， this review also provided perspective to this emerging field. Reference | Related Articles | Metrics