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Thermally conductive poly(lactic acid)/boron nitride composites via regenerated cellulose assisted Pickering emulsion approach

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Journal of Materials Science & Technology 2022年第6期101卷 146-154页

作者： Yating Wang Hong Jin Jiajun Shen Bijia Wang Xueling Feng Zhiping Mao Yumei Zhang xiaofeng sui Key Lab of Science and Technology of Eco-Textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityNo.2999North Renmin RoadSongjiang DistrictShanghai 201620China Innovation Center for Textile Science and Technology of DHU Donghua UniversityNo.2999North Renmin RoadSongjiang DistrictShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityNo.2999North Renmin RoadSongjiang DistrictShanghai 201620China

Polymer-based thermally conductive composites have attracted tremendous interest in thermal management of electronics.However,it remains challenging to achieve high thermal conductivity partly because the difficulty to obtain favorable distribution and orientation of conductive fillers within the polymer matrix.Herein,networked boron nitride(BN)conductive pathway was realized within the poly(lactic acid)(PLA)matrix,via regenerated cellulose(RC)-assisted assembly of BN on Pickering emulsion interface based on the noncovalent interaction,followed by solvent evaporation and hot-compressing.The strong noncovalent interactions between BN and RC were found critical to enhance the wettability and stability of BN in aqueous media with a lowest mass ratio of 1:40 of RC and BN.The obtained PLA/BN composites feature a thermal conductivity of 1.06 W/(m K)at 28.4 wt%BN loading,representing an enhancement of 430%comparing to neat PLA,and the crystallinity of the composites could increase significantly from11.7%(neat PLA)to 43.7%.This simple,environmentally friendly and effective strategy could be easily extended for effective construction of thermally conductive composites.

关键词： Boron nitride Regenerated cellulose Emulsion Noncovalent interaction Thermal conductivity

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Effect of Solvophilic Chain Length in PISA Particles on Pickering Emulsion

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Chinese Journal of Chemistry 2021年第12期39卷 3448-3454页

作者： Min Zeng Shuo Zhou xiaofeng sui Jinying Yuan Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China Key Lab of Science and Technology of Eco-textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China

The morphology of polymeric nanoparticles prepared by polymerization-induced self-assembly(PISA)is depended on the degree of polymerization of the solvophilic and solvophobic blocks.Herein,a series of poly(N,N-dimethylaminoethyl methacrylate)-b-poly(benzyl methacrylate)(PDMA-b-PBzMA)diblock copolymer spherical nanoparticles were synthesized via reversible addition-frag-mentation chain transfer(RAFT)mediated PISA.These diblock copolymer nanoparticles are with nearly the same hydrodynamic size and solvophobic chain length,but with different solvophilic chain length.We used these nanoparticles to stabilize the oil-in-water Pickering emulsion.We find that the stability of Pickering emulsion increases with the length of solvophilic chain of the nanoparticles.Moreover,the droplet size of the Pickering emulsion can be tailored by varying the oil/water ratio and concentration of nanoparticles.

关键词： Pickering emulsion Polymerization-induced self-assembly Polymerization Block copolymer Nanoparticles

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Experimental study of the flow and heat transfer of a gas–water mixture through a packed channel

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Science Bulletin 2016年第5期61卷 406-415页

作者： Xiaolei Zhu xiaofeng sui Yan Zhao Ji'an Meng Zhixin Li School of Aerospace Tsinghua University Beijing Yuanshen Energy Saving Technology Co. Ltd. Thermal Research Institute Tianjin University

Waste heat recovery from the flue gas of gasfired boilers was studied experimentally by measuring the flow and heat transfer of air and water through six kinds of packing with saturated humid air as the simulated flue gas.The experiments measured the effects of inlet air temperature, inlet air velocity and circulating water flow rate on the flow and heat transfer. The results show that higher inlet air temperatures and lower inlet air velocities lower the flow resistance and increase the heat transfer coefficient. The stainless steel packing had better surface wettability and larger thermal conductivity than the plastic packing, which enhanced the heat transfer between the water and the saturated moist air. When both the flow resistance reduction and the heat transfer enhancement were considered, the experimental results gave an optimal packing-specific surface area. A packed heat exchanger tower was designed for waste heat recovery from the flue gas of gas-fired boilers based on the experimental results which had better flow and heat transfer characteristics with lower pump and fan power consumption, more stable system operation and less thermal fluctuations compared with a non-packed heat transfer system with atomized water.

关键词：循环水流量传热实验流动阻力混合物饱和湿空气烟气余热回收塑料包装燃气锅炉

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Polyoxometalate-loaded Nanocellulose Sponge as a Novel Catalyst for the Regioselective Hydroboration of Phenylacetylene

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Paper And Biomaterials 2019年第2期4卷 1-9页

作者： GuoQing Yang CongCong Zhang BiJia Wang ZhiPing Mao Hong Xu Yi Zhong XueLing Feng xiaofeng sui Key Lab of Science and Technology of Eco-textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai201620China Innovation Center for Textile Science and Technology of DHU Donghua UniversityShanghai201620China

In this work,an amino-modified cellulose nanofiber sponge was prepared and used as a support for polyoxometalate(POM)catalysts with a high loading efficiency.Fourier transform infrared spectroscopy,thermogravimetric analysis,and energy-dispersive X-ray spectroscopy revealed that an Anderson-type POM,(NH4)4[CuMo6O18(OH)6]·5H2O was successfully immobilized on the sponge based on electrostatic interactions.Morphological analysis indicated that the POM-loaded sponge retained its porous structure and that the POM was homogeneously distributed on the sponge walls.The POM-loaded sponge exhibited excellent mechanical properties by recovering 79.9%of its original thickness following a 60%compression strain.The POM-loaded sponge was found to effectively catalyze the hydroboration of phenylacetylenes,yielding excellent conversion and regioselectivity of up to 96%and 99%,respectively.Its catalytic activity remained unchanged after five reuse cycles.These findings represent a scalable strategy for immobilizing POMs on porous supports.

关键词： cellulose nanofiber polyoxometalates catalyst immobilization hydroboration heterogeneous catalyst

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基于二维碳化钛材料修饰的功能棉针织物制备及其性能

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纺织学报 2023年第4期44卷 132-138页

作者：葛佳慧毛志平张琳萍钟毅隋晓锋徐红东华大学生态纺织教育部重点实验室上海201620 东华大学化学与化工学院上海201620 山东中康国创先进印染技术研究院有限公司国家先进印染技术创新中心山东泰安271000

为拓展二维碳化钛材料在棉针织物中的应用,制备具有一定耐水洗性能的导电棉针织物,首先利用LiF/HCl混合溶液刻蚀前驱体钛碳化铝获得二维碳化钛导电材料(Ti_(3)C_(2)T_(x)),再对棉针织物进行阳离子化改性,使Ti_(3)C_(2)T_(x)通过静电作... 详细信息

为拓展二维碳化钛材料在棉针织物中的应用,制备具有一定耐水洗性能的导电棉针织物,首先利用LiF/HCl混合溶液刻蚀前驱体钛碳化铝获得二维碳化钛导电材料(Ti_(3)C_(2)T_(x)),再对棉针织物进行阳离子化改性,使Ti_(3)C_(2)T_(x)通过静电作用附着到阳离子化的棉针织物表面,得到导电棉针织物材料。借助X射线衍射仪、X射线光电子能谱仪、扫描电子显微镜、透射电子显微镜等手段对棉针织物在阳离子化改性前后以及负载Ti_(3)C_(2)T_(x)前后进行形貌表征和元素分析。通过RTS-9型四探针测试导电棉针织物的表面电阻,对棉针织物阳离子化改性工艺及Ti_(3)C_(2)T_(x)在阳离子化棉针织物表面的负载条件进行了优化。得到棉针织物阳离子化改性的最佳工艺:阳离子改性剂用量为10%(o.w.f),氢氧化钠质量浓度为10 g/L,获得Ti_(3)C_(2)T_(x)在阳离子化棉针织物表面的最佳负载条件(超声波处理60 min)。在优化条件下,负载Ti_(3)C_(2)T_(x)的阳离子化改性棉针织物表面电阻可低至84.5Ω/□,经20次水洗后,导电棉针织物的表面电阻由84.5Ω/□上升至95.6Ω/□,仍在100Ω/□以下,可满足导电要求。

关键词：二维碳化钛材料阳离子改性导电织物耐水洗性能功能纺织品

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高灵敏度,超宽响应范围,环境耐受性高的多模式离子凝胶基传感器

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Science China Materials 2023年第5期66卷 1899-1910页

作者：铁建飞毛志平张琳萍钟毅隋晓锋徐红 Key Lab of Science and Technology of Eco-textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyInnovation Center for Textile Science and TechnologyDonghua UniversityShanghai 201620China National Manufacturing Innovation Center of Advanced Dyeing and Finishing Technology Taian 271000China

近年来,离子类皮肤传感器因其高性能和良好的兼容性等优点而备受关注.然而,开发一种多功能、稳定、高灵敏度和耐用的离子类皮肤传感器仍面临挑战.本文通过简单的紫外引发聚合制备了具有良好耐用性、环境(抗冻、耐真空)稳定性、离子导电... 详细信息

近年来,离子类皮肤传感器因其高性能和良好的兼容性等优点而备受关注.然而,开发一种多功能、稳定、高灵敏度和耐用的离子类皮肤传感器仍面临挑战.本文通过简单的紫外引发聚合制备了具有良好耐用性、环境(抗冻、耐真空)稳定性、离子导电性、自愈性、高粘附性和拉伸性的复合离子凝胶.该离子凝胶可以组装为应变、压力和温度传感器,用于检测外部环境的变化.无论是作为应变传感器还是压力传感器,离子凝胶基传感器都具有高灵敏度(GF=14.7)、宽响应范围(1%-1600%)、快速响应时同(95.8 ms)、优异的稳定性和可重复性(1000次).因此,它不仅可以追踪关节运动,还可以监测细微的表情变化(皱眉).该离子凝胶还可以组装成敲击传感器和高精度书写板传感器,用于信息传递.此外,该传感器对温度变化具有较高的灵敏度,温度感知范围在0-120℃之间,且检测阈值较低(0.1℃).因此,基于离子凝胶的传感器有望应用于多功能电子和传感设备.

关键词： stretchability environmental tolerance high sensitivity wide range strain/temperature sensor

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A CAD-based Parameterization Method of Finite Element Modeling for Structural Shape Optimization

A CAD-based Parameterization Method of Finite Element Modeli...

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The Fourth World Congress of Structural and Multidisciplinary Optimization

作者： Zhenqun Guan xiaofeng sui Chao Song Yuanxian Gu State Key Laboratory of Structural Analysis for Industrial Equipment Dept. of Engineering Mechanics Dalian University of Technology Dalian 116024 China

＜正＞The CAD-based design model is critically important for the finite element modeling and the shape design optimization with a parameterization method. In this paper, a parameterization method of finite element modeling for the shape design optimization using the AutoCAD/MDT is presented. The proposed method will allow the design engineer to build a parametric model for finite element analysis and shape design optimization. When the design parameters are changed, the mesh generator will be evoked to update original mesh or re-mesh the new design model, meanwhile, the attribute data such as loads, boundary conditions, material properties, and etc. will be recalculated to adapt to the new model. The emphases of this paper are put on the research and implementation of following points, （i） A CAD-based design parameterization technique that ties the finite element modeling system and a dimension-driven CAD tool, （ii） The deep access method to the database of the software package AutoCAD/MDT, such as B-rep date structure, （iii） To integrate the mesh generator with the AutoCAD/MDT;（iv） Parameterization of finite element modeling that supports the updating of structural geometry in AutoCAD/MDT.

关键词： Parameterization Finite Element Modeling Shape Optimization

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纳米甲壳素稳定蜂蜡油凝胶Pickering乳液的性能研究

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日用化学工业 2022年第8期52卷 844-850页

作者：沈嘉骏宦静静王碧佳隋晓锋东华大学化学化工与生物工程学院生态纺织教育部重点实验室上海201620 芬美意香料(中国)有限公司上海201108

用盐酸蒸汽处理甲壳素原料来制备纳米甲壳素,其形貌为棒状结构且平均直径约为50~60 nm、具有较高的长径比。以蜂蜡和玉米油制成的油凝胶作为油相,用纳米甲壳素作为Pickering乳液稳定剂,制得O/W型油凝胶Pickering乳液。用光学显微镜、荧... 详细信息

用盐酸蒸汽处理甲壳素原料来制备纳米甲壳素,其形貌为棒状结构且平均直径约为50~60 nm、具有较高的长径比。以蜂蜡和玉米油制成的油凝胶作为油相,用纳米甲壳素作为Pickering乳液稳定剂,制得O/W型油凝胶Pickering乳液。用光学显微镜、荧光显微镜、动态光散射粒度仪、流变仪对乳液进行表征。偏振光显微镜图片中的双折射现象表明蜂蜡油凝胶被包裹在油滴中。荧光显微镜的结果显示纳米甲壳素在油/水界面的吸附能力很强,在纳米甲壳素质量分数仅为0.2%时,即可乳化含有10%(质量分数)蜂蜡的油相得到稳定的油凝胶Pickering乳液(油/水质量比为1∶9),且干燥除水后能够维持原貌。油凝胶以及其乳液的流变行为表明纳米甲壳素在油/水界面具有较好的机械阻隔作用,且油凝胶可以在剪切作用下被释放。

关键词： Pickering乳液纳米甲壳素盐酸蒸汽蜂蜡油凝胶

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纳米甲壳素的快速制备及其乳化性能研究

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日用化学工业（中英文） 2022年第10期52卷 1081-1087页

作者：宦静静王碧佳毛志平隋晓锋东华大学化学化工与生物工程学院生态纺织教育部重点实验室上海201620

简化磷酸溶解再生制备纳米甲壳素的工艺,避免大量溶剂的使用、缩短制备时间以及提高产率。采用X射线衍射、透射电镜和电感耦合等离子体发射光谱仪对甲壳素及再生纳米甲壳素进行了表征。以辛酸/癸酸甘油三酯(GTCC)作为油相,用纳米甲壳素... 详细信息

简化磷酸溶解再生制备纳米甲壳素的工艺,避免大量溶剂的使用、缩短制备时间以及提高产率。采用X射线衍射、透射电镜和电感耦合等离子体发射光谱仪对甲壳素及再生纳米甲壳素进行了表征。以辛酸/癸酸甘油三酯(GTCC)作为油相,用纳米甲壳素作为Pickering乳液稳定剂,制得水包油(O/W)型Pickering乳液。通过各类表征证明该方法制备的所有纳米甲壳素均可以乳化GTCC得到稳定的Pickering乳液(纳米甲壳素含量为0.2%)。随后其乳液的流变行为表明纳米甲壳素能很好地吸附在油水界面上,并且稳定Pickering乳液。

关键词：纳米甲壳素磷酸高效制备 Pickering乳液

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含湿率对多孔介质热导率测量准确性的影响

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化工学报 2008年第11期59卷 2768-2773页

作者：于明志隋晓凤彭晓峰方肇洪山东建筑大学热能工程学院山东济南250101 清华大学热能工程系北京100084

Thermal conductivity measurement accuracy of sands was experimentally studied with a hot disk thermal constant analyzer and water morphologies,distribution and evolution at pore scale were observed with charge coupled device(CCD)combined with microscope.It was found that thermal conductivities of samples with a low moisture content(<25%)could not be accurately measured.For samples with a low moisture content,the analysis showed that the water in the region adjacent to the analyser sensor mainly existed as isolated liquid bridges between/among sand particles and would evaporate and diffuse to relatively far regions because of being heated by the sensor during measurement.Water evaporation and diffusion caused the sample composition in the region adjacent to the sensor vary throughout the whole measurement process,and accordingly low accuracy of the obtained thermal conductivities.Due to high water connectivity in pores,the rate of water evaporation and diffusion in porous media of high moisture content was relatively slow compared with that in porous media of low moisture content.Meanwhile,water in the relatively far region flowed back to the region adjacent to the sensor by capillary force.Therefore,sample composition of the region adjacent to the sensor maintained constant and thermal conductivities of porous media with a relatively high moisture content could be measured with high accuracy.

关键词：多孔介质含湿率热导率测量

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