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Journal of Materials Science & Technology 2022年第10期105卷 194-202页

作者： Jing Tian Yi Yang tiantian xue Guojie Chao Wei Fan Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China

The materials with thermal insulating and fre-retardant properties are highly demanded for architectures to improve the energy *** applications of conventional inorganic insulating materials such as silica aerogels are restricted by their mechanical fragility and organic insulating materials are either easily ignitable or exhibit unsatisfactory thermal insulation ***,we report an organic/inorganic composite aerogel with integrated double network structure,in which silica constituent homogeneously distribute in the anisotropic polyimide nanofber aerogel matrix and strong interfacial effect is formed between two *** integrated binary network endows the polyimide/silica composite aerogels with outstanding compressibility and flexibility even with a high inorganic content of 60%,which can withstand 500 cyclic fatigue tests at a compressive strain of 50%in the radial *** resulting composite aerogel exhibits a combination of outstanding insulating performance with a low thermal conductivity(21.2 mW m^(-1)K^(-1))and excellent resistance to a 1200℃flame without *** high-performance polyimide/silica aerogels can decrease the risk brought by the collapse of reinforced concrete structures in a fre,demonstrating great potential as efficient building materials.

关键词： Polyimide Silica Aerogel Thermal insulation Fire-retardancy

Luminescent metal nanoclusters for biomedical applications

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Nano Research 2019年第6期12卷 1251-1265页

作者： Yu Su tiantian xue Yuxin Liu Jinxia Qi Rongchao Jin Zhenkun Lin Center of Scientific Research The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhou 325035China Department of Chemistry Carnegie Mellon UniversityPittsburghPA 15213USA

Luminescent metal nanoclusters (NCs) have recently emerged as a novel class of luminescent nanomaterials and hold significant potential in biomedicine owing to their ultrasmall (<2nm) size,excellent photostability,and good *** recent rapid advances in the synthesis and functionalization of luminescent metal NCs have enabled scientists to develop colorful nanomaterials and nanodevices for a wide range of biomedical *** this review,we summarize the characteristics and advantages of luminescence from metal NCs,and highlight their applications in *** focus on the research in biomedical detection,bio-imaging,drug delivery,and therapy,especially for the advances in the last five *** metal NCs display a series of unique superiorities in biomedical applications,and the recent achievements have brought a lot of benefits to the diagnosis and treatment of clinical diseases,especially for tumors and ***,we put forward the main challenges that currently still hinder the basic science studies and the practical development of luminescent metal NCs in biomedical ***,we expect that luminescent metal NCs will play a much more important role in future biomedicine and clinical applications.

关键词： metal nanoclusters luminescence biomedicine biomedical detection bio-imaging drug delivery therapy

Fluorine-containing polyimide nanofiber membranes for durable and anti-aging daytime radiative cooling

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Journal of Materials Science & Technology 2024年第12期179卷 166-173页

作者： Qiaoran Zhang tiantian xue Yang Lu Lei Ma Dingyi Yu Tianxi Liu Wei Fan Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Personal daytime radiative cooling(PDRC)materials have high sunlight reflection and high selective emis-sivity to outer space in the main atmospheric window,demonstrating huge potential in energy-saving for sustainable ***,polymer-based membranes for radiative cooling have been widely re-ported,due to their easy processing,low cost,and unique optical ***,the desired high sunlight reflectance of PDRC materials is easily dampened by environmental aging,high temperature,and ultraviolet(UV)irradiation,resulting in reduced cooling performance for most polymers,adverse to large-scale practical *** this work,we demonstrate a novel polyimide nanofiber(PINF)membrane with a fluorine-containing structure via typical electrospinning *** resultant PINF membrane exhibits high sunlight reflectance,UV resistance,and excellent thermal stability,rendering anti-aging day-time radiative *** sunlight reflectance of PINF membranes could maintain constant in the aging test for continuous 720 h under outdoor solar irradiation,exhibiting durable and long-term personal day-time radiative cooling performance.

关键词： Polyimide Nanofiber UV resistance Daytime radiative cooling

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 ***,achieving a high porosity and low thermal conductivity for aerogel fibers remain challenging,despite the innovative designs of porous ***,we fabricated lightweight and super-thermal insulating polyimide(PI)aerogel fibers via freeze-spinning by using polyvinyl alcohol(PVA)as a pore *** 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 *** 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 *** 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 *** 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

3D Printed Integrated Gradient-Conductive MXene/CNT/Polyimide Aerogel Frames for Electromagnetic Interference Shielding with Ultra-Low Reflection

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Nano-Micro Letters 2023年第3期15卷 332-345页

作者： tiantian xue Yi Yang Dingyi Yu Qamar Wali Zhenyu Wang xuesong Cao 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 Institute of Environmental Processes and Pollution Control School of Environment and Civil EngineeringJiangnan UniversityWuxi 214122People’s Republic of China NUTECH School of Applied Sciences&Humanities National University of TechnologyIslamabad 44000Pakistan

Construction of advanced electromagnetic interference(EMI)shielding materials with miniaturized,programmable structure and low reflection are promising but ***,an integrated transition-metal carbides/carbon nanotube/polyimide(gradient-conductive MXene/CNT/PI,GCMCP)aerogel frame with hierarchical porous structure and gradient-conductivity has been constructed to achieve EMI shielding with ultra-low *** gradient-conductive structures are obtained by continuous 3D printing of MXene/CNT/poly(amic acid)inks with different CNT contents,where the slightly conductive top layer serves as EM absorption layer and the highly conductive bottom layer as reflection *** addition,the hierarchical porous structure could extend the EM dissipation path and dissipate EM by multiple ***,the GCMCP aerogel frames exhibit an excellent average EMI shielding efficiency(68.2 dB)and low reflection(R=0.23).Furthermore,the GCMCP aerogel frames with miniaturized and programmable structures can be used as EMI shielding gaskets and effectively block wireless power transmission,which shows a prosperous application prospect in defense industry and aerospace.

关键词： 3D printing MXene/CNT/Polyimide aerogel Gradient-conductive Electromagnetic interference shielding

MicroRNA-122-functionalized DNA tetrahedron stimulate hepatic differentiation of human mesenchymal stem cells for acute liver failure therapy

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Bioactive Materials 2023年第10期28卷 50-60页

作者： Hongyan Wei Fenfang Li tiantian xue Haixia Wang Enguo Ju Mingqiang Li Yu Tao Laboratory of Biomaterials and Translational Medicine Center for NanomedicineThe Third Affiliated HospitalSun Yat-sen UniversityGuangzhou510630China Guangdong Provincial Key Laboratory of Liver Disease Research Guangzhou510630China

As the most abundant liver-specific microRNA, microRNA-122 (miR122) played a crucial role in the differentiation of stem cells into hepatocytes. However, highly efficient miR122 delivery still confronts challenges including poor cellular uptake and easy biodegradation. Herein, we for the first time demonstrated that the tetrahedral DNA (TDN) nanoplatform had great potential in inducing the differentiation of human mesenchymal stem cells (hMSCs) into functional hepatocyte-like cells (HLCs) by transferring the liver-specific miR122 to hMSCs efficiently without any extrinsic factors. As compared with miR122, miR122-functionalized TDN (TDN-miR122) could significantly up-regulate the protein expression levels of mature hepatocyte markers and hepatocyte-specific marker genes in hMSCs, indicating that TDN-miR122 could particularly activate the hepatocyte-specific properties of hMSCs for developing cell-based therapies in vitro. The transcriptomic analysis further indicated the potential mechanism that TDN-miR122 assisted hMSCs differentiated into functional HLCs. The TDN-miR122-hMSCs exhibited hepatic cell morphology phenotype, significantly up-regulated specific hepatocyte genes and hepatic biofunctions in comparison with the undifferentiated MSCs. Preclinical in vivo transplantation appeared that TDN-miR122-hMSCs in combination with or without TDN could efficiently rescue acute liver failure injury through hepatocyte function supplement, anti-apoptosis, cellular proliferation promotion, and anti-inflammatory. Collectively, our findings may provide a new and facile approach for hepatic differentiation of hMSCs for acute liver failure therapy. Further large animal model explorations are needed to study their potential in clinical translation in the future.

关键词： Hepatocyte differentiation Tetrahedral framework nucleic acids Cell therapy Transcriptomics Acute liver failure treatment

Framework nucleic Acid-MicroRNA mediated hepatic differentiation and functional hepatic spheroid development for treating acute liver failure

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Bioactive Materials 2024年第11期41卷 611-626页

作者： Hongyan Wei tiantian xue Fenfang Li Enguo Ju Haixia Wang Mingqiang Li Yu Tao Laboratory of Biomaterials and Translational Medicine Center for NanomedicineThe Third Affiliated HospitalSun Yat-sen UniversityGuangzhou510630GuangdongChina Guangdong Provincial Key Laboratory of Liver Disease Research Sun Yat-sen UniversityGuangzhou510630GuangdongChina Department of Obstetrics and Gynecology Women and Children's Hospital of Chongqing Medical UniversityNo.120 Longshan RoadYubei DistrictChongqing401147China Department of Obstetrics and Gynecology Chongqing Health Center for Women and ChildrenNo.120 Longshan RoadYubei DistrictChongqing401147China

The specific induction of hepatic differentiation presents a significant challenge in developing alternative liver cell sources and viable strategies for clinical therapy of acute liver failure (ALF). The past decade has witnessed the blossom of microRNAs in regenerative medicine. Herein, microRNA 122-functionalized tetrahedral framework nucleic acid (FNA-miR-122) has emerged as an unprecedented and potential platform for directing the hepatic differentiation of adipose-derived mesenchymal stem cells (ADMSCs), which offers a straightforward and cost-effective method for generating functional hepatocyte-like cells (FNA-miR-122-iHep). Additionally, we have successfully established a liver organoid synthesis strategy by optimizing the co-culture of FNA-miR-122-iHep with endothelial cells (HUVECs), resulting in functional Hep:HUE-liver spheroids. Transcriptome analysis not only uncovered the potential molecular mechanisms through which miR-122 influences hepatic differentiation in ADMSCs, but also clarified that Hep:HUE-liver spheroids could further facilitate hepatocyte maturation and improved tissue-specific functions, which may provide new hints to be used to develop a hepatic organoid platform. Notably, compared to transplanted ADMSCs and Hep-liver spheroid, respectively, both FNA-miR-122-iHep-based single cell therapy and Hep:HUE-liver spheroid-based therapy showed high efficacy in treating ALF in vivo. Collectively, this research establishes a robust system using microRNA to induce ADMSCs into functional hepatocyte-like cells and to generate hepatic organoids in vitro, promising a highly efficient therapeutic approach for ALF.

关键词： Hepatic differentiation Framework nucleic acid Functional hepatic spheroids Transcriptome sequencing analysis Acute liver failure therapy

3D Printed Polyimide/Silica Composite Aerogels for Customizable Thermal Insulation from-50℃ to 1300℃

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Chinese Journal of Polymer Science 2024年第7期42卷 936-945,I0007页

作者： Dingyi Yu tiantian xue Zhuocheng Ma Zaiyin Hu Lijuan Long Yue-E Miao Wei Fan Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China Guizhou Aerospace Wujiang Electro-Mechanical Equipment Co. Ltd.Zunyi563000China School of Materials and Architectural Engineering Guizhou Normal UniversityGuiyang550025China

Aerogels are widely used as thermal insulation materials because of their high porosity and low bulk ***,the insulation performance of aerogels is limited to a narrow temperature ***,the preparation of aerogel materials with precisely controlled and complex architectures is still ***,we report 3D printed polyimide/silica aerogel particle(PI/SAP)composite aerogels for thermal insulation in a wide range of temperature with customized *** printability and shape fidelity of 3D printed composite aerogels is improved by adding hydrophilic SAP as a rheology *** resulting PI/SAP composite aerogel exhibits excellent flame-retardant properties and thermal insulation from-50℃ to 1300℃.Moreover,the PI/SAP composite aerogel with customized shape can be applied for battery insulation at subzero temperatures,promising to be used as customizable and stable insulating materials in a variety of complex and extreme applications.

关键词： 3D printing Polyimide Aerogel Silica Thermal insulation

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《资本论》的时间批判与数字资本权力的消解

湖北社会科学 2023年第9期 5-13页

作者：薛天天吉林大学马克思主义学院吉林长春130012

时间问题是马克思政治经济学批判的重要主题。在《资本论》中,马克思从人们生命时间蜕化为劳动时间的具体机制中发现了资本权力规训生命的秘密,时间批判由此显现为消解资本权力的现实运作。作为资本权力布展的前提,时间商品化在客观上... 详细信息

时间问题是马克思政治经济学批判的重要主题。在《资本论》中,马克思从人们生命时间蜕化为劳动时间的具体机制中发现了资本权力规训生命的秘密,时间批判由此显现为消解资本权力的现实运作。作为资本权力布展的前提,时间商品化在客观上构筑于价值形式作为中介的普遍物象化的社会,在主观上有赖于劳动力商品化的实现。资本权力制定的“工作日—时间表”兼具规训与惩罚双重机制,它将价值生产转换为时间生产并制定了时间纪律的刚性制度,通过罚金制度制定了时间规范的弹性补偿。在数字资本主义社会,数字资本在数字平台上通过占有和分配数字劳动产生的一般数据最大化地控制数字用户的生命时间。消解数字资本权力的生命时间驯服需要数字无产阶级争夺数字平台领导权,引导互联网的共享性走向。“数字中国”作为中国式方案为人类的数字时代走向打开了广阔的现实通道。

关键词：时间商品化工作日劳动时间生命时间数字资本权力

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Superhydrophobic polyvinylidene fluoride/polyimide nanofiber composite aerogels for thermal insulation under extremely humid and hot environment

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Science China Materials 2021年第5期64卷 1267-1277页

作者： Fan Yang Xingyu Zhao tiantian xue Shijia Yuan Yunpeng Huang Wei Fan Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInnovation Center for Textile Science and TechnologyDonghua UniversityShanghai 201620China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China

Excellent thermal insulating materials are highly demanded in various applications including buildings, aerospace and sport equipment. However, in practical applications,the performance of thermal insulating materials usually deteriorates under diverse temperature and humidity ***, it is highly essential to construct a bulk material that exhibits outstanding thermal insulation performance under extremely humid and hot environment. In this work, we have conceived a green and effective strategy to fabricate a superhydrophobic and compressible polyvinylidene fluoride/polyimide(PVDF/PI) nanofiber composite aerogel via electrospinning and freeze-drying technique. Interestingly, the PVDF nanofibers and PI nanofibers function as the hydrophobic fibrous framework and mechanical support skeleton,respectively, forming a robust three-dimensional framework with good mechanical flexibility. The PVDF/PI aerogel possesses outstanding superhydrophobic feature(water contact angle of 152°) and low thermal conductivity(31.0 m W m^(-1)K^(-1))at room temperature. Significantly, even at 100% relative humidity(80℃), the PVDF/PI aerogel still exhibits a low thermal conductivity of only 48.6 m W m^(-1)K^(-1), which outperforms the majority of commercial thermal insulating materials. Therefore, the novel PVDF/PI aerogel is promising as an excellent thermal insulating material for the applications in high-temperature and humid environment.

关键词： nanofiber aerogel polyimide polyvinylidene fluoride superhydrophobic thermal insulation