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Remarkable enhancement of gas selectivity on organosilica hybrid membranes using urea-modulated metal-organic framework nanoparticles

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Frontiers of Chemical Science and Engineering 2024年第2期18卷 83-92页

作者： Yayun Zhao Dechuan Zhao Chunlong kong Yichao Lin Xuezhen Wang liang Chen Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China Collaboration Innovation Center for Tissue Repair Material Engineering Technology China West Normal UniversityNanchong 637009China

Metal-organic framework/organosilica hybrid membranes on tubular ceramic substrates have shown great potential for the implementation of membrane technology in practical gas separation projects due to their higher permeance compared to commercial ***,the selectivities of the reported membranes are ***,we have incorporated urea-modulated metal-organic frameworks into organosilica membranes to greatly enhance its separation *** urea-modulated metal-organic frameworks exhibit less-defined edges of crystallographic facets and high defect *** can be well-dispersed in the organosilica layer,which substantially suppresses the interfacial defects between metal-organic frameworks and organosilica,which is beneficial for improving the selectivity of membranes for gas *** results have shown that the enhanced ideal selectivity of H_(2)/CH_(4) was 165 and that of CO_(2)/CH_(4) was 43,with H_(2) permeance of about 1.25×10^(−6) mol·m^(−2)·s^(−1)·Pa^(−1) and CO_(2) permeance of 3.27×10^(−7) mol·m^(−2)·s^(−1)·Pa^(−1) at 0.2 MPa and 25℃.In conclusion,the high level of hybrid membranes can be used to separate H_(2)(or CO_(2))from the binary gas mixture H_(2)/CH_(4)(or CO_(2)/CH_(4)),which is important for gas separation in practical ***,the simple and feasible modulation of metal-organic framework is a promising strategy to tune different metal-organic frameworks for membranes according to the actual demands.

关键词： ZIF-8 nanocrystals urea organosilica hybrid membrane enhanced separation performance

Facile synthesis of defected TiO_(2-x)(B) nanosheet/graphene oxide hybrids with high photocatalytic H_(2) activity

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Journal of Materials Science & Technology 2021年第21期80卷 171-178页

作者： xiangchen kong Huiming Huang Zhaoyang Li Yanqin liang Zhenguo Li Shengli Zhu School of Materials Science and Engineering Tianjin UniversityTianjin300350China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin300300China School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou730070China

TiO_(2)(B) nanosheets/GO(graphene oxide) hybrids are considered to be outstanding performance photocatalysts for high efficiency of H_(2) evolution. However, they still suffer severe challenges during the synthetic processes, such as a large amount of the capping agents adhering on the surface and easy occurrence of aggregation. To figure out these obstacles, Ar plasma treatment as a modified method in this study not only enable the TiO_(2)(B) nanosheets distributed uniformly on the GO sheets but also engineer defects within TiO_(2)(B) nanosheets to significantly improve the photocatalytic activity for the water splitting. The hydrogen evolution rate of the TiO_(2)-x(B)/GO sheets is 1.4 times higher compared with that of original TiO_(2)(B)/GO sheets without Ar plasma treatment. The improved photocatalytic properties were owing to the synergetic effects of oxygen vacancies and the heterojunction between GO and TiO_(2)(B), which can promote the visible light utilization and accelerate separation and transportation of photogenerated electron-holes. This study can provide a facile pathway to prepare the two-dimensional hybrid photocatalysts with high photocatalytic H_(2) activity.

关键词： TiO_(2)(B)nanosheets Plasma etching Structure defect Heterojunction Photocatalytic H_(2)evolution

Potassium sulphate induces resistance of rice against the rootknot nematode Meloidogyne graminicola

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Journal of Integrative Agriculture 2022年第11期21卷 3263-3277页

作者： LIU Mao-Yan PENG De-liang SU Wen xiang Chao JIAN Jin-zhuo ZHAO Jie PENG Huan LIU Shi-ming kong Ling-an DAI liang-ying HUANG Wen-kun LIU Jing Key Laboratory for Biology and Control of Plant Diseases and Insect Pests College of Plant ProtectionHunan Agricultural UniversityChangsha 410128P.R.China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China School of Agricultural Science Xichang UniversityXichang 615013P.R.China

Potassium(K),an important nutrient element,can improve the stress resistance/tolerance of *** application of K in resisting plant-parasitic nematodes shows that the K treatment can reduce the occurrence of nematode diseases and increase crop ***,data on K_(2)SO_(4)induced rice resistance against the root-knot nematode Meloidogyne graminicola are still *** this work,K_(2)SO_(4)treatment reduced galls and nematodes in rice plants and delayed the development of *** than affecting the attractiveness of roots to nematodes and the morphological phenotype of giant cells at feeding sites,such an effect is achieved by rapidly priming hydrogen peroxide(H_(2)O_(2))accumulation and increasing callose ***,galls and nematodes in rice roots were more in the potassium channel OsAKT11 and transporter OsHAK5 gene-deficient plants than in wild-type,while the K_(2)SO_(4)-induced resistance showed weaker in the defective *** addition,during the process of nematode infection,the expression of jasmonic acid(JA)/ethylene(ET)/brassinolide(BR)signaling pathway-related genes and pathogenesis-related(PR)genes OsPR1 a/OsPR1 b was up-regulated in rice after K_(2)SO_(4)*** conclusion,K_(2)SO_(4)induced rice resistance against *** mechanism of inducing resistance was to prime the basal defense and required the participation of the K^(+)channel and transporter in *** laid a foundation for further study on the mechanism of rice defense against nematodes and the rational use of potassium fertilizer on improving rice resistance against nematodes in the field.

关键词： rice Meloidogyne graminicola potassium sulphate induced resistance H_(2)O_(2) callose potassium channel and transporter

Dielectric Spectroscopy Study on Vesicles of CTAB/SDBS System

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Chinese Chemical Letters 2001年第1期12卷 91-94页

作者： Su xiang WEI Ying LI kong Shuang ZHAO Department of Chemistry South China Normal UniversityGuangzhou 510631

Amphiphilic molecules can form into different structures, such as micelle, microemulsion, vesicle, liposome, liquid crystals, and so on by self-associating. The Dielectric Spectroscopy (DS) method has been applied to the systems of micelle and microemulsion successfully. For the first time the author put the method to the system of vesicle of CTAB/SDBS. The experiments show clear dielectric relaxation and the results were discussed primarily.

关键词： Dielectric spectroscopy vesicle macroscopic relaxation time

Predictive factors for lymph node metastasis and defining a subgroup treatable for laparoscopic lymph node dissection after endoscopic submucosal dissection in poorly differentiated early gastric cancer

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World Journal of Gastrointestinal Oncology 2018年第10期10卷 360-366页

作者： Hua Li Zhi-Bin Huo Fan-Ting kong Qing-Qiang He Yun-He Gao Wen-Quan liang Deng-xiang Liu De-partment of Surgical Oncology Xing Tai People Hospital Department of General Surgery Chinese People’s Liberation Army General Hospital Institute of Cancer Control Xing Tai People Hospital

AIM To investigate the predictive factors of lymph node metastasis(LNM)in poorly differentiated early gastric cancer(EGC);to guide the individual application of a combination of endoscopic submucosal dissection(ESD)and laparoscopic lymph node dissection(LLND)in a suitable subgroup of patients with poorly differentiated *** We retrospectively analyzed 138 patients with poorly differentiated EGC who underwent gastrectomy with lymphadenectomy between January 1990 and December *** association between the clinicopathological factors and the presence of LNM was retrospectively analyzed by univariate and multivariate logistic regression *** ratios(OR)with 95%confidence interval(95%CI)were *** further examined the relationship between the positive number of the significant predictive factors and the LNM *** The tumor diameter(OR=13.438,95%CI:1.773-25.673,P=0.029),lymphatic vessel involvement(LVI)(OR=38.521,95%CI:1.975-68.212,P=0.015)and depth of invasion(OR=14.981,95%CI:1.617-52.844,P=0.024)were found to be independent risk factors for LNM by multivariate *** the 138 patients diagnosed with poorly differentiated EGC,21(15.2%)had *** patients with one,two and three of the risk factors,the LNM rates were 7.7%,47.6%and 64.3%,*** was not found in 77 patients that did not have one or more of the three risk *** ESD might be sufficient treatment for intramucosal poorly differentiated EGC if the tumor is less than or equal to2 cm in size and when LVI is absent upon postoperative histological *** with LLND may lead to the elimination of unnecessary gastrectomy in poorly differentiated EGC.

关键词： Poorly differentiated cancer Laparoscopic lymph node dissection Lymph node metastasis Early gastric cancer Endoscopic submucosal dissection

On Improved Delay-dependent Robust Stability Criteria for Uncertain Systems with Interval Time-varying Delay

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International Journal of Automation and computing 2015年第1期12卷 102-108页

作者： Jun-Jun Hui He-Xin Zhang xiang-Yu kong Xin Zhou The Xi'an Research Institute of High Technology The Baoji Research Institute of High Technology

This paper considers the problem of delay-dependent robust stability for uncertain systems with interval time-varying delays. By using the direct Lyapunov method, a new Lyapunov-Krasovskii(L-K) functional is introduced based on decomposition approach, when dealing with the time derivative of L-K functional, a new tight integral inequality is adopted for bounding the cross terms. Then, a new less conservative delay-dependent stability criterion is formulated in terms of linear matrix inequalities(LMIs),which can be easily solved by optimization algorithms. Numerical examples are given to show the effectiveness and the benefits of the proposed method.

关键词： Lyapunov-Krasovskii(L-K) functional delay decomposition approach linear matrix inequality(LMI) interval timevarying delay robust stability

Effect of initiation manners on the scattering characteristics of semi-preformed fragment warhead

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Defence Technology（防务技术） 2018年第5期14卷 578-584页

作者： Xu-yang Wang xiang-shao kong Cheng Zheng Wei-guo Wu Key Laboratory of High Performance Ship Technology (Wuhan University of Technology) Ministry of Education Departments of Naval Architecture Ocean and Structural Engineering School of Transportation Wuhan University of Technology

The lethality of a semi-preformed fragment warhead is closely related to the expand velocity and spatial distribution of the fragments from ruptured metal casing. The topic of how to improve the utilization of charge of have been drawing great attention from researchers and designer in this filed. In present paper,in order to investigate the influence of charge initiation manners on the scattering characteristics of semi-preformed fragment warhead, the numerical simulations and experimental test are ***, the influence of grid density on numerical results is investigated, and a proper numerical model with relatively high accuracy and effectiveness is determined. Then. numerical simulations of three kinds of different initiation position of a semi-preformed fragment warhead are carried out. An experimental test of the explosion of a semi-preformed fragment warhead is carried out. By comparing and analyzing the numerical results and experimental data, it is found that the initiation manners have great influence on scattering characteristics of semi-preformed fragment warhead. The researcher work of this paper would provide an effective alternative method to optimize the design of warhead.

关键词： Initiation manners Semi-preformed fragment warhead Deformation pattern

Equicontinuity of Maps on a Dendrite with Finite Branch Points

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Acta Mathematica Sinica,English Series 2017年第8期33卷 1125-1130页

作者： Tai xiang SUN Guang Wang SU Hong Jian XI Xin kong College of Information and Statistics Guangxi University of Finance and Economics College of Mathematics and Information Science Guangxi University

Let （T, d） be a dendrite with finite branch points and f be a continuous map from T to T. Denote by w（x, f） and P（f） the w-limit set of x under f and the set of periodic points of f, respectively. Write Ω（x, f） = {yl there exist a sequence of points xk ∈ T and a sequence of positive integers n1 〈 n2 〈 … such that lim k→∞ Xk = X and lim k→∞ f nk （xk） = y}. In this paper, we show that the following statements are equivalent：（1） f is equicontinuous. （2） w（x, f） = Ω（x, f） for any x ∈ T. （3） ∩ ∞ n=1 f n（T） = P（f）, and w（x, f） is a periodic orbit for every x ∈ T and map h： x → w（x, f）（x ∈ T） is continuous. （4） Ω（x, f） is a periodic orbit for any x ∈ T.

关键词： Dendrite map equicontinuity periodic point ε-limit set

Chinese ink-facilitated fabrication of paper-based composites as electrodes for supercapacitors

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International Journal of Smart and Nano Materials 2021年第3期12卷 351-374页

作者： Weili Yan Zhuohao Xiao Xiuying Li xiang Wu Ling Bing kong School of Materials Science and Engineering Nanyang Technological UniversitySingapore School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhenJiangxiChina School of Materials Science and Engineering Shenyang University of TechnologyShenyangLiaoningChina College of New Materials and New Energies Shenzhen Technology UniversityShenzhenGuangdongChina

Commercial Chinese ink was employed to disperse pristine vapor-grown carbon nanofibers(VGCNFs)in aqueous suspensions via horizontal ball *** obtained suspension was used to fabricate conductive paper-based composites through filtration-deposition onto filter *** was found that the carbon black particles from the Chinese ink helped separate VGCNFs and acted as connection points between the VGCNFs,while the glue reinforced the conduction ***,the VGCNF-ink/paper ternary composite showed sufficiently low sheet *** merely 2.5 mg·cm^(−2)VGCNFs,the sheet resistance could be reduced to 4.5Ω·sq^(−1).As a proof of concept,these paper-based composites were directly used as electrodes of solid-state symmetric electronic double-layer capacitors(EDLCs)and the substrate for the electrodeposition of MnO_(2)to achieve higher electrochemical *** EDLCs fabricated with 2.5 mg·cm^(−2)VGCNFs showed a specific capacitance of 224 mF·cm^(−2)at a current density of 1 mA·cm^(−2),which was retained by 86.4%after 10,000 charge-discharge ***,thanks to the high electrical conductivity and the porous structure,the MnO_(2)decorated paper-based composites exhibited dramatically enhanced specific *** is believed that our finding offers an idea to directly utilize commercial Chinese ink for the fabrication of electrode materials.

关键词： Chinese ink carbon nanofibers paper-based electrodeposition supercapacitors