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Thermal conductivity of micro/nano-porous polymers: Prediction models and applications

Frontiers of physics 2022年第2期17卷 135-153页

作者： Haiyan Yu Haochun Zhang Jinchuan Zhao Jing Liu Xinlin Xia Xiaohu Wu School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Microcellular Plastics Manufacturing Laboratory(MPML) Department of Mechanical&Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoM5S 3G8OntarioCanada Cellular Polymer Science&Technology Laboratory School of Materials Science&EngineeringShandong UniversityJinan 250061China Shandong Institute of Advanced Technology Jinan 250100China

Micro/nano-porous polymeric material is considered a unique industrial material due to its extremelylow thermal conductivity, low density, and high surface area. Therefore, it is necessary to establishan accurate thermal conductivity prediction model suiting their applicable conditions and provide atheoretical basis for expanding their applications. In this work, the development of the calculationmodel of equivalent thermal conductivity of micro/nano-porous polymeric materials in recent yearsis summarized. Firstly, it reviews the process of establishing the overall equivalent thermal conductivity calculation model for micro/nanoporous polymers. Then, the predicted calculation models ofthermal conductivity are introduced separately according to the conductive and radiative thermalconductivity models. In addition, the thermal conduction part is divided into the gaseous thermalconductivity model, solid thermal conductivity model and gas-solid coupling model. Finally, it isconcluded that, compared with other porous materials, there are few studies on heat transfer of micro/nanoporous polymers, especially on the particular heat transfer mechanisms such as scale effectsat the micro/nanoscale. In particular, the following aspects of porous polymers still need to be furtherstudied: micro scaled thermal radiation, heat transfer characteristics of particular morphologies at thenanoscales, heat transfer mechanism and impact factors of micro/nanoporous polymers. Such studieswould provide a more accurate prediction of thermal conductivity and a broader application in energyconversion and storage systems.

关键词： thermal conductivity micro/nanoscale thermal radiation micro/nanoscale thermal conduction porous polymers heat transfer properties

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Benzimidazole-Linked porous polymers:Synthesis and Gas Sorption Properties

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中国化学:英文版 2015年第1期33卷 131-136页

作者： Yi Cui Yanchao Zhao Tao Wang Baohang Han National Center for Nanoscience and Technology Beijing 100190China

A series of benzimidazole-linked porous polymers are obtained by the condensation reaction between the o-aminobenzol end groups of building blocks(2,3,6,7,10,11-hexaaminotriphenylene,3,3'-diaminobenzidine or 1,2,4,5-benzenetetraamine)and the aldehyde groups of building blocks[terephthalicaldehyde,4,4'-biphenyl-dicarboxaldehyde,1,3,5-tris(4-acetylphenyl)benzene or 1,3,5-tris(4-formylbiphenyl)amine]in one-pot synthesis without employing any catalyst or *** existence of the imidazole ring in the obtained polymers could be identified by Fourier transform infrared and solid-state^(13)C CP/MAS NMR *** sphere-shaped mor-phology of the obtained polymers is observed through scanning electron *** polymers possess Brunauer-Emmett-Teller specific surface area values over 600 m^(2)·g^(-1),showing hydrogen storage(up to 1.6 wt%,at 77 K and 1×10^(5)Pa)and carbon dioxide capture(up to 12.6 wt%,at 273 K and 1×10^(5)Pa)*** poly-mers would possess good performance in the applications of gas storage and separation.

关键词： benzimidazole porous polymers hydrogen storage carbon dioxide capture

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Direct Analysis of Whole Blood by a Disposable Monolithic Column Mass Spectrometry Analysis Kit

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Chinese Journal of Chemistry 2024年第10期42卷 1073-1078页

作者： Wenxin Wang Jin Han Yutong Zheng Haijie Wang Chengbiao Zhu Yongyi Li Yuqi Feng Zhenwei Wei Xiangyu Wang College of Chemistry and Molecular Science Wuhan UniversityWuhanHubei 430072China School of Public Health Wuhan UniversityWuhanHubei 430072China Schoolof Bioengineering and Health Wuhan Textile UniversityWuhanHubei 430200China

A monolithic column-based mass spectrometry(MS)analysis kit was prepared for whole blood analysis with *** kit is disposable and can be used for purification,storage,transportation and direct analysis of whole *** kit mainly consists of a capillary for quantitative microsampling,a cation exchange monolithic column for purification and storage,and a syringe for loading *** kit is very friendly to various users that one can easily siphon the blood in the kit followed by rapid *** established a quantitative method using the kit with a limit detection as low as 0.33 nmol/L,and achieved more than five orders of magnitude enhancement in sensitivity compared to direct nanoelectrospray ionization MS *** column can avoid analyte exposure to environment,which helps the storage of the sample for laboratory *** relative standard deviation of immediate blood analysis and storage blood analysis within 10 d was less than 10%.This method has been successfully applied to the quantitative analysis of procainamide hydrochloride in 2μL rat *** results indicate that this disposable kit does have the potential to achieve highly sensitive quantitative MS analysis in biological samples,which is expected to become a cost-effective and powerful tool for in vitro diagnostics.

关键词： Clinical Ms Whole blood analysis porous polymers Matrix isolation Trace analysis

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Engineering of hollow polymeric nanosphere-supported imidazolium-based ionic liquids with enhanced antimicrobial activities

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Nano Research 2022年第6期15卷 5556-5568页

作者： Yu Zhang Shuwei Li Yixin Xu Xinyun Shi Mingxin Zhang Yingning Huang Ying Liang Yaqiong Chen Wanli Ji Jung Rae Kim Wenliang Song Deng-Guang Yu Il Kim School of Pharmacy Shanghai University of Medicine&Health SciencesShanghai 201318China School of Materials Science&Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Polymer Science and Engineering Pusan National UniversityBusan 46241Republic of Korea School of Chemical and Biomolecular Engineering Pusan National UniversityBusan 46241Republic of Korea

The design of stable,efficient and processable bactericidal materials represents a significant challenge for combating multidrugresistant bacteria in a variety of engineering ***,we report a facile strategy for the preparation of hollow polymeric nanosphere(HPN)-supported imidazolium-based ionic liquids(denoted as HPN-ILs)with superior antimicrobial *** were tailored by moderate Friedel−Crafts polymerization followed by the sequential covalent bonding of imidazole and *** resultant HPN-ILs have uniform hollow spherical morphology,an adequate surface area,and excellent physicochemical ***,they are highly active against both Gram-positive and Gram-negative bacteria and exhibit typical time/dosage-dependent antibacterial *** rational combination of porous HPNs and antibacterial ILs to generate an all-in-one entity may open new avenues for the design and fabrication of efficient bacteriostatic ***,HPN-ILs have good biocompatibility and can also be loaded onto diverse matrices,and thus could extend their practical bactericidal application in the potential biomedical-active field.

关键词： antibacterial materials bioactive materials hollow nanospheres ionic liquids porous polymers

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Hierarchical Assemblies of Bottlebrush/Homopolymer Blends: Tailoring Phase Interfacial Curvature for Tunable Photonics

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中国化学:英文版 2023年第13期41卷 1566-1574页

作者： Han Yi Yuesheng Li Dong-Po Song Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin300350 China

Organized spontaneous emulsification (OSE) produces ordered water-in-oil-in-water (W/O/W) multiple emulsion droplets stabilized by bottlebrush block copolymer (BBCP) surfactants, such as (polynorbornene-g-polystyrene)-b-(polynorbornene-g-polyethylene oxide) (PS-b-PEO), templating ordered porous particles with visible structural colors. Here, homopolymer polystyrenes (hPS) were used to swell the PS domain and thus to effectively increase the W/O interfacial curvature of the internal droplets. By variation of hPS concentration, pore diameter is largely tunable from 34 to over 210 nm, leading to tunable photonic bandgaps in the whole visible spectrum. The ratio (α) of molecular weight of hPS relative to that of the PS side chains of the BBCP can greatly influence their spatial distribution within the PS domain. For α ≤ 1, uniform solubilization of the hPS chains into the side chains of BBCP is achieved leading to a homogeneous porous structure. For α > 1, local solubilization of the hPS chains at interface of the internal droplets is disclosed at relatively low concentrations of hPS (≤ 42 wt%), resulting in a small change in pore diameter. For contrast, a rapid increase of the W/O interfacial curvature was observed upon further increase of the hPS content (> 42 wt%) through an evident influence on the OSE procedure.

关键词： Block copolymer Self-assembly porous polymers Copolymers Microstructures

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Fully Conjugated Covalent Organic Frameworks:Synthesis,Structures and Applications

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Chinese Journal of Chemistry 2023年第23期41卷 3447-3472页

作者： Yueshuai Xu Guanshi Ren Dianqi Zhang Lishui Sun Yingjie Zhao College of Polymer Science and Engineering Qingdao University of Science and TechnologyQingdaoShandong266000 China

This review presents a comprehensive examination of fully conjugated covalent organic frameworks(COFs),which constitute an emerging class of porous materials with immense potential for diverse *** article focuses on diversified fully conjugated COFs,including sp2 carbon-carbon linkages,pyrazine linkages,benzobisoxazole linkages,dioxin linkages,β-aminoalkenone linkages,*** synthesis techniques and structural attributes of these COFs are expounded upon in great detail,along with their potential applications in various *** review thus provides a valuable resource for researchers keen on delving into the synthesis and applications of fully conjugated COFs,thereby highlighting their potential for developing novel functional materials with distinctive properties.

关键词： Covalent organic frameworks Fully-conjugated system Crystallinity Stability Conjugation porous polymers Conjugated polymers

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S-enriched porous polymer derived N-doped porous carbons for electrochemical energy storage and conversion

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 346-357页

作者： Chao Zhang Chenbao Lu Shuai Bi Yang Hou Fan Zhang Ming Cai Yafei He Silvia Paasch Xinliang Feng Eike Brunner Xiaodong Zhuang State Key Laboratory of Metal Matrix Composites & Shanghai Key Lab of Electrical Insulation and Thermal Ageing School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 China Key Laboratory of Biomass Chemical Engineering of Ministry of Education College 0f Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China Center for Advancing Electronics Dresden (cfaed) Technische Universitat Dresden 01062 Dresden. Germany Chair for Molecular Functional Materials Department of Chemistry and Food Chemistry School of Science Technische Universit~t Dresden Mommensenstr. 4 01069 Dresden Germany

porous polymers have been recently recog- nized as one of the most important precursors for fabrication of heteroatom-doped porous carbons due to the intrinsic porous structure, easy available heteroatom- containing monomers and versatile polymerization meth- ods. However, the heteroatom elements in as-produced porous carbons are quite relied on monomers. So far, the manipulating of heteroatom in porous polymer derived porous carbons are still very rare and challenge. In this work, a sulfur-enriched porous polymer, which was prepared from a diacetylene-linked porous polymer, was used as precursor to prepare S-doped and/or N-doped porous carbons under nitrogen and/or ammonia atmo- spheres. Remarkably, S content can sharply decrease from 36.3% to 0.05% after ammonia treatment. The N content and specific surface area of as-fabricated porous carbons can reach up to 1.32% and 1508 m^2·g^-1, respectively. As the electrode materials for electrical double-layer capacitors, as-fabricated porous carbons exhibit high specific capacitance of up to 431.6 F·g^-1 at 5 mW·s^-1 and excellent cycling stability of 99.74% capacitance retention after 3000 cycles at 100 mV·s^-1. Furthermore, as the electro- chemical catalysts for oxygen reduction reaction, as- fabricated porous carbons presented ultralow half-wave- potential of 0.78 V versus RHE. This work not only offers a new strategy for manipulating S and N doping features for the porous carbons derived from S-containing porous polymers, but also paves the way for the structure- performance interrelationship study of heteroatoms co- doped porous carbon for energy applications.

关键词： porous polymers porous carbons sulfur and nitrogen doping supercapacitor

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