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Polyimide Aerogel Fibers with Controllable Porous Microstructure for Super‑Thermal Insulation Under Extreme Environments

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Advanced Fiber Materials 2022年第5期4卷 1118-1128页

作者： Tiantian Xue Chenyu Zhu xueling feng Qamar Wali Wei Fan Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 North Renmin RoadShanghai 201620People’s Republic of China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122People’s Republic of China School of Applied Sciences and Humanities National University of TechnologyIslamabad 42000Pakistan

Application of aerogel fibers in thermal insulating garments have sparked a substantial interest.However,achieving a high porosity and low thermal conductivity for aerogel fibers remain challenging,despite the innovative designs of porous struc-ture.Herein,we fabricated lightweight and super-thermal insulating polyimide(PI)aerogel fibers via freeze-spinning by using polyvinyl alcohol(PVA)as a pore regulator.The high affinity of PVA with water enables it to accelerate the ice crystal nucleation,adjust pore formation,and construct a controllable porous structure of PI aerogel fiber.The as-fabricated PI aerogel fiber has a considerable reduced pore size,high porosity(95.6%),improved flexibility and mechanical strength,and can be woven into fabrics.The PI aerogel fabric exhibits low thermal conductivity and excellent thermal insulation in a wide range of temperature(from-196 to 300℃).Furthermore,the PI aerogel fabrics can be easily functionalized to expand their applications,such as in intelligent temperature regulation and photothermal conversion.These results demonstrate that the aerogel fibers/fabric are promising materials for next-generation textile materials for personal thermal management.

关键词： Polyimide Aerogel fiber Pore regulation Thermal insulation Thermal management

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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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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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废旧棉制备再生纤维素气凝胶实现盐晶收集及高效海水淡化

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印染 2024年第7期50卷 1-5页

作者：周兆汉冯雪凌钟毅徐红毛志平王碧佳生态纺织教育部重点实验室(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山东泰安271000 国家染整工程技术研究中心上海201620

从回收再利用废旧棉布出发,结合边缘结晶效应,制备了集太阳能蒸发与盐收集于一体的气凝胶蒸发器。以碳纳米管为光热材料,通过对气凝胶的亲疏水区域复合以及形状设计,实现了边缘结晶。研究了蒸发器的水传输行为、区域化温度差异以及不同... 详细信息

从回收再利用废旧棉布出发,结合边缘结晶效应,制备了集太阳能蒸发与盐收集于一体的气凝胶蒸发器。以碳纳米管为光热材料,通过对气凝胶的亲疏水区域复合以及形状设计,实现了边缘结晶。研究了蒸发器的水传输行为、区域化温度差异以及不同浓度的盐溶液对蒸发速率的影响,并在3.5%NaCl溶液中实现了1.93 kg/(m^(2)·h)的蒸发速率、高达91.5%的蒸发效率以及高达99.5%的离子去除率。

关键词：废旧棉再生纤维素气凝胶太阳能蒸发海水淡化集盐

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Self-assembly of insulated molecular wires of a water-soluble cationic PPV and anionic dendrons

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Chinese Science Bulletin 2009年第14期54卷 2451-2456页

作者： feng xueling YAO ZhiYi LI Chun SHI Gao Quan Key Laboratory of Bio-organic Phosphorous Chemistry and Chemical Biology Department of Chemistry Tsinghua University Beijing 100084 China

Insulated molecular wires of poly(phenylenevinylene) (PPV) were prepared by wrapping the conjugated backbones with dendrons through a noncovalent approach. It was found that electrostatic interaction between the quaternary ammonium groups of PPV-1 and the carboxylate moieties in dendrons induced the packing of dendrons along PPV-1 conjugated backbones. Absorption and emission spectroscopic examinations in solution and solid film indicated that the PPV-1 backbones adopted a more planar and isolated conformation in the complexes. Furthermore, interchain interactions in the complexes could be greatly reduced, improving the quantum yield of PPV-1.

关键词：导线绝缘乙烯分子阴离子阳离子水溶性自组装静电相互作用

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Stabilizing semi-transparent perovskite solar cells with a polymer composite hole transport layer

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Nano Research 2024年第3期17卷 1500-1507页

作者： Yongbin Jin Huiping feng Zheng Fang Liu Yang Kaikai Liu Bingru Deng Jingfu Chen xueling Chen Yawen Zhong Jinxin Yang Chengbo Tian Liqiang Xie Zhanhua Wei Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing Institute of Luminescent Materials and Information DisplaysCollege of Materials Science and EngineeringHuaqiao UniversityXiamen 361021China

Semi-transparent perovskite solar cells(ST-PSCs)have broad applications in building integrated photovoltaics.However,the stability of ST-PSCs needs to be improved,especially in n-i-p ST-PSCs since the doped 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene(Spiro-OMeTAD)is unstable at elevated temperatures and high humidity.In this work,aπ-conjugated polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)](PBDB-T)is selected to form a polymer composite hole transport layer(HTL)with Spiro-OMeTAD.The sulfur atom of the thiophene unit and the carbonyl group of the polymer interact with the undercoordinated Pb2+at the perovskite surface,which stabilizes the perovskite/HTL interface and passivates the interfacial defects.The incorporation of the polymer also increases the glass transition temperature and the moisture resistance of Spiro-OMeTAD.As a result,we obtain ST-PSCs with a champion efficiency of 13.71%and an average visible light transmittance of 36.04%.Therefore,a high light utilization efficiency of 4.94%can be obtained.Moreover,the encapsulated device can maintain 84%of the initial efficiency after 751 h under continuous one-sun illumination(at 30%relative humidity)at the open circuit and the unencapsulated device can maintain 80%of the initial efficiency after maximum power tracking for more than 1250 h under continuous one-sun illumination.

关键词： semi-transparent solar cells π-conjugated polymer composite hole transport layer building integrated photovoltaics

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基于变换匹配层融合的双模态生物特征识别方法

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计算机工程 2023年第5期49卷 269-276页

作者：孙妍胡龙冯雪玲上海大学计算机工程与科学学院上海200444

自新冠疫情发生以来,戴口罩预防疾病可能会成为大众的常态化行为。若大部分面部特征被遮挡会影响人脸识别方法的精度,同时距离也会对面部识别造成一定影响。然而,步态作为一种可远距离并且难以伪装的生物特征,容易受身体遮挡、角度等外... 详细信息

自新冠疫情发生以来,戴口罩预防疾病可能会成为大众的常态化行为。若大部分面部特征被遮挡会影响人脸识别方法的精度,同时距离也会对面部识别造成一定影响。然而,步态作为一种可远距离并且难以伪装的生物特征,容易受身体遮挡、角度等外部条件变化的影响。提出一种基于变换匹配层的识别方法,以融合步态和面部特征。通过步态特征提取网络提取人体轮廓图中具有区分度的时空生物特征,以解决单模态人脸识别技术难以在远距离条件下对带口罩目标进行识别的问题,采用面部特征提取网络提取脸部的细粒度特征,以增强网络对于目标主体轮廓被遮挡的鲁棒性。在匹配层将面部特征与步态特征进行归一化后再将信息融合,以达到特征互补的效果。此外,构建相关联的全局-局部时空特征提取模块。通过局部特征提取模块提取细粒度的步态特征,并采用基于互补掩码的多尺度随机带状分割策略增强各个局部特征之间的关联关系。全局特征提取模块提取全局步态信息,与局部细粒度信息形成互补,从而提高步态特征提取网络对于遮挡、视角变化的鲁棒性。实验结果表明,该方法的识别准确率达到99.16%,相较于步态、面部特征提取网络分别提高6.56和0.45个百分点,并且在远距离且戴口罩的真实场景下识别准确率达到94.52%,分别提升1.92和5.98个百分点。

关键词：生物特征双模态特征融合步态识别面部识别

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Rational design of robust and transparent superrepellent surfaces for long-term marine antifouling

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Science China Technological Sciences 2024年第7期67卷 2031-2039页

作者： CHEN Hui WANG Zhi WANG DaHeng XIAO feng FU Guang-En BU xueling ZHAO Lei ZHANG Tao WU DaHeng PU JiBin The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science & Technology Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences

Superhydrophobic surfaces have demonstrated exceptional efficacy in combatting biofouling contaminations of optical devices and equipment in marine applications. However, the fabrication of highly transparent superhydrophobic materials remains a formidable challenge due to the inherent trade-off between surface roughness for superhydrophobicity and optical transparency.Herein, we design a robust and transparent superhydrophobic coating(Si-POSS) embedded silica nanoparticles(200 nm) with fluorinated polyhedral oligomeric silsesquioxanes(F-POSS) and zinc pyrithione(ZPT). The Si-POSS coating exhibits excellent water repellence toward diverse liquids and optical transmittance exceeding 90% in the visible spectrum. Moreover, the Si-POSS coating sustains long-term anti-bacterial(> 99.11%) and anti-algal effects for over 30 days, accompanied by mechanical,chemical, and thermal stability. This research asserts that the Si-POSS coating with outstanding combined characteristics holds significant potential for marine applications, particularly in self-cleaning and antifouling endeavors.

关键词： superhydrophobic surface transparent marine antifouling nanoparticles

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“两融合、三转化”创客训练营课程设计与实践

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实验室研究与探索 2023年第9期42卷 190-195页

作者：吴葛尹仕冯学玲华中科技大学电气与电子工程学院武汉430074

“创客训练营”是面向大学一年级本科生开设的一门创新实践类选修课程(暑期)。该课程将创新创业教育理论及方法的学习与创意项目的构思、设计、实施、运行(CDIO)融为一体;将创新创业教育理论及方法的课内学习和体验与课前创意的提出、... 详细信息

“创客训练营”是面向大学一年级本科生开设的一门创新实践类选修课程(暑期)。该课程将创新创业教育理论及方法的学习与创意项目的构思、设计、实施、运行(CDIO)融为一体;将创新创业教育理论及方法的课内学习和体验与课前创意的提出、课后作品的成果化融为一体,推行课前创意项目化,课中项目作品化,课后作品成果化。实践结果表明,基于“两融合、三转化”的创客训练营课程,培养了学生形成想法并使想法变成现实的能力。

关键词：本科生两融合三转化动手实践

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火电厂中压电缆热稳定最小截面的一种估算方法

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能源与节能 2022年第2期 69-72页

作者：冯学玲刘勇华中科技大学电气与电子工程学院湖北武汉430074 中国电力工程顾问集团中南电力设计院有限公司湖北武汉430071

在火电厂6~10 kV厂用电系统中,电缆热稳定截面需要依据GB 50217—2018《电力工程电缆设计标准》中规定的方法进行反复验算后确定。当系统中回路较多时,计算量较大。给出了一种电缆热稳定截面的简化方法。通过对短路热稳定条件下电缆导... 详细信息

在火电厂6~10 kV厂用电系统中,电缆热稳定截面需要依据GB 50217—2018《电力工程电缆设计标准》中规定的方法进行反复验算后确定。当系统中回路较多时,计算量较大。给出了一种电缆热稳定截面的简化方法。通过对短路热稳定条件下电缆导体所允许最小截面的表达式进行变换,并对该表达式进行简化拟合,在系统电源供给短路电流的周期分量起始有效值已知的情况下,可通过求极小值的方式得到最小截面。通过一些工程实例,利用提出的估算方法进行了热稳定截面计算,并与传统推算方法对比。结果表明,估算方法结果准确,可有效减小计算量,提高设计效率。

关键词：厂用电电缆导体热稳定截面拟合

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