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Chinese Journal of Polymer Science 2023年第1期41卷 143-152页

作者： Bo-Wen Wang Hao Liu Jin Ying Chun-Tai Liu chang-yu shen Ya-Ming Wang Key Laboratory of Materials Processing&Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450002China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Poly(lactic acid) (PLA) is a promising bio-based environmentally-friendly plastic. Nevertheless, the physical aging-induced brittleness of PLA limits its widespread applications. Blending with immiscible ductile polymer is an effective way to toughen PLA. However, the underlying details of the toughening mechanism and, in particular, the effect of physical aging are not well understood. Herein, atomic force microscopy (AFM) based nanomechanical mapping technology was utilized to visualize the differences in the deformation mechanisms between unaged and aged PLA/poly(ε-caprolactone) (PCL) blend upon uniaxial drawing. Results show that physical aging has a significant effect on the microscopic Young’s modulus and its distribution of PLA matrix, resulting in a highly heterogeneous response of the PLA/PCL blend to external stress and affecting the mechanical properties of the PLA phase under different extensions. This work provides a new experimental basis for understanding the effect of physical aging on the mechanical properties of PLA-based materials.

关键词： Poly(lactic acid) Blends Toughening Physical aging Nanomechanical mapping

Self-nucleation of Patterned Polymer Thin Films Defined by Soft Lithography

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Chinese Journal of Polymer Science 2022年第6期40卷 651-657页

作者： Ze-Qian Wang Yi-Meng Wang Xing-yu Wang Bing-Hua Wang Jing-Bo Chen chang-yu shen Bin Zhang School of Materials Science&Engineering Zhengzhou UniversityZhengzhou 450002China

The nucleation of crystals is often a determining step in the phase transition of materials,but it remains a challenge to control the density and specific location of nuclei *** we fabricated the isolated single crystals of uniform size with controlled number density and spatial distribution by self-nucleation of patterned dendritic *** lithography creates the periodic void space on the surface of poly(ethylene oxide)-b-poly(2-vinyl pyridine)(PEO-b-P2VP)block copolymer thin films and provides spatial redistribution of polymers,leading to the preferential nucleation and subsequent oriented growth of dendrites in the periodic arrays of imprinted *** morphology and thermal stability of the patterned crystals can be adjusted by tuning embossing conditions(e.g.,temperature and pressure).Furthermore,in the self-nucleation technique,the annealing temperature and heating rate are used as the feedback parameters to map the number density and spatial distribution of regrown single *** PEO-b-P2VP crystalline pattern can be used as a versatile template for large-area manufacturing of selective metal patterns for electronic devices and other applications.

关键词： Self-nucleation Imprint lithography Atomic force microscopy Crystallization pattern Selective metal pattern

Garnet-type solid-state electrolytes:crystal structure,interfacial challenges and controlling strategies

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Rare Metals 2023年第10期42卷 3177-3200页

作者： Ting-Ting Wu Sijie Guo Bing Li chang-yu shen Xian-Hu Liu An-Min Cao National Engineering Research Center for Advanced Polymer Processing Technology Key Laboratory of Advanced Material Processing&Mold(Ministry of Education)Zhengzhou UniversityZhengzhou450002China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology and Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing100190China University of Chinese Academy of Sciences Beijing100049China

All-solid-state batteries(ASSBs) hold great promise for next-generation energy storage technologies owing to their advantage in different aspects such as energy density,safety,and wide temperature ***,the use of solid-state electrolytes(SSEs) instead of liquid ones meanwhile brings serious concerns related to the point-to-point contact between SSEs and electrodes,which is known to result in high interface resistance and inhomogeneous distribution of charges during the Li^(+)plating/stripping process,eventually leading to a premature failure of *** review focuses on the garnet-type SSEs in the formula of Li_(7)La_(3)Zr_(2)O_(12)(LLZO),and discusses the structure-performance relationship of this ceramic electrolyte in detail to achieve a clear understanding of its Li^(+)transmission ***,the challenges of cubic phase LLZO(c-LLZO) for their application in solidstate batteries(SSBs) are demonstrated by the Li/LLZO interface,which features the importance of Li metal wettability and dendrite suppression for sustainable ***,this review summarizes the recent research strategies to combat these contact issues at the Li/LLZO interface,highlighting the essential role played by surface modification of LLZO *** the obtained insights,perspectives for future research on LLZO to accelerate its potential development of SSBs in commercialized applications are also provided.

关键词： Solid-state electrolytes(SSEs) Garnet-type electrolytes Li^(+)ion conductivity Interface engineering Lithium dendrites

Enhanced Crystallization of Poly(butylene adipate-co-terephthalate)by a Self-assembly Nucleating Agent

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Chinese Journal of Polymer Science 2024年第5期42卷 663-674,I0010页

作者： Cheng Zhou Kun Chen Zi-Heng Zhang Meng-Fan Jing Chun-Tai Liu chang-yu shen Ya-Ming Wang State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450002China

Poly(butylene adipate-co-terephthalate)(PBAT)is a promising biodegradable flexible polymer but suffers from slow crystallization rate,making it less attractive for some applications like the injection-molded products in comparison with low-density polyethylene(LDPE).This work aimed to accelerate the crystallization of PBAT by adding a self-assembly nucleating agent octamethylenedicarboxylic dibenzoylhydrazide(OMBH).PBAT/OMBH composites with various OMBH contents(0 wt%,0.5 wt%,0.7 wt%,1 wt%,2 wt%,3 wt%and 5 wt%)were prepared through *** effect of OMBH on the crystallization behavior,morphologies and mechanical properties of PBAT was *** highest nucleation efficiency value of 59.6%was achieved for PBAT with 0.7 wt%OMBH,much higher than that of 22.7%for PBAT with 0.7 wt%*** force microscopy results showed that OMBH formed fine fibers and induced the formation of transcrystalline layers of *** transform infrared spectroscopy(FTIR)combined with two-dimensional correlation spectra suggested that the intermolecular dipole-dipole N—H…O=C interactions but not hydrogen bond between OMBH and PBAT promoted the crystallization of PBAT in the initial period of *** presence of OMBH did not change the crystal form of PBAT but had positive contribution in enhancing its crystallinity and mechanical *** work is essential for preparing PBAT with high crystallization rate,enhancing its potential applications in injection-molded products.

关键词： Poly(butylene adipate-co-terephthalate) Biodegradable Self-assembly nucleating agent Crystallization

One-step and Continuous Fabrication of Coaxial Piezoelectric Fiber for Sensing Application

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Chinese Journal of Polymer Science 2023年第11期41卷 1778-1785,I0009页

作者： Shuai-Shuai Gui Bing-Xu Da Fei Peng Guo-Qiang Zheng Kun Dai Chun-Tai Liu chang-yu shen College of Materials Science and Engineering Key Laboratory of Material Processing and Mold(Ministry of Education)Henan Key Laboratory of Advanced Nylon Materials and ApplicationZhengzhou UniversityZhengzhou 450001China

Although there has been rapid advancement in piezoelectric sensors,challenges still remain in developing wearable piezoelectric sensors by a one-step,continuous and environmentally friendly *** this work,a 1D flexible coaxial piezoelectric fiber was directly fabricated by melt extrusion molding,whose core and sheath layer are respectively slender steel wire(i.e.,electrode)and PVDF(i.e.,piezoelectric layer).Moreover,such 1D flexible coaxial piezoelectric fiber possesses short response time and high sensitivity,which can be used as a selfpowered sensor for bending and vibration *** interestingly,such 1D flexible coaxial piezoelectric fiber(1D-PFs)can be further endowed with 3D helical ***,a wearable and washable motion monitoring system can be constructed via braiding such 3D helical piezoelectric fiber(3D-PF)into commercial *** work paves a new way for developing 1D and 3D piezoelectric fibers through a one-step,continuous and environmentally friendly method,showing potential applications in the field of sensing and wearable electronics.

关键词： Coaxial piezoelectric fiber Melt extrusion molding Bending and vibration sensing Motion monitoring system

An Ultrasensitive, Durable and Stretchable Strain Sensor with Crack-wrinkle Structure for Human Motion Monitoring

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Chinese Journal of Polymer Science 2021年第3期39卷 316-326,I0005页

作者： Ze-yu Li Wei Zhai yun-Fei yu Guo-Jie Li Peng-Fei Zhan Jian-Wei Xu Guo-Qiang Zheng Kun Dai Chun-Tai Liu chang-yu shen shen Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationSchool of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

Flexible strain sensor has promising features in successful application of health monitoring, electronic skins and smart robotics, ***, we report an ultrasensitive strain sensor with a novel crack-wrinkle structure(CWS) based on graphite nanoplates(GNPs)/thermoplastic urethane(TPU)/polydimethylsiloxane(PDMS) nanocomposite. The CWS is constructed by pressing and dragging GNP layer on TPU substrate,followed by encapsulating with PDMS as a protective layer. On the basis of the area statistics, the ratio of the crack and wrinkle structures accounts for 31.8% and 9.5%, respectively. When the sensor is stretched, the cracks fracture, the wrinkles could reduce the unrecoverable destruction of cracks, resulting in an excellent recoverability and stability. Based on introduction of the designed CWS in the sensor, the hysteresis effect is limited effectively. The CWS sensor possesses a satisfactory sensitivity(GF=750 under 24% strain), an ultralow detectable limit(strain=0.1%) and a short respond time of 90 ms. For the sensing service behaviors, the CWS sensor exhibits an ultrahigh durability(high stability>2×10^(4) stretching-releasing cycles). The excellent practicality of CWS sensor is demonstrated through various human motion tests,including vigorous exercises of various joint bending, and subtle motions of phonation, facial movements and wrist pulse. The present CWS sensor shows great developing potential in the field of cost-effective, portable and high-performance electronic skins.

关键词： Polymer nanocomposites Microstructure Flexible strain sensor Human motion monitoring

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人工智能在脑卒中管理中的研究进展

中国现代神经疾病杂志 2021年第1期21卷 14-20页

作者：于长申巫嘉陵天津市环湖医院神经康复科天津市脑血管与神经变性重点实验室300350

人工智能作为一种新兴技术,已应用于脑卒中预防、诊治和康复等多领域,并突显出巨大的潜力。人工智能与大数据相结合,可用于脑卒中高危人群的精准识别、自动化病因分型、辅助脑卒中急性期和二级预防策略的制定,从而提高脑卒中患者康复治... 详细信息

人工智能作为一种新兴技术,已应用于脑卒中预防、诊治和康复等多领域,并突显出巨大的潜力。人工智能与大数据相结合,可用于脑卒中高危人群的精准识别、自动化病因分型、辅助脑卒中急性期和二级预防策略的制定,从而提高脑卒中患者康复治疗效果。本文综述人工智能在脑卒中预防、诊治和康复中的研究进展。

关键词：卒中人工智能一级预防二级预防神经康复综述

148例呼吸机相关性肺炎细菌分布特点及抗生素耐药性调查

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中国综合临床 2008年第10期24卷 1033-1036页

作者：吴迪于长申天津市环湖医院十二病区ICU 300060

目的了解2007年1～12月我院ICU病房呼吸机相关性肺炎（VAP）病原菌分布特点和抗生素耐药的情况，为临床抗感染药物的正确应用提供参考资料：方法对148例VAP患者痰培养病原学及药敏结果进行回顾性分析。结果2007年1～12月VAP发生率为70... 详细信息

目的了解2007年1～12月我院ICU病房呼吸机相关性肺炎（VAP）病原菌分布特点和抗生素耐药的情况，为临床抗感染药物的正确应用提供参考资料：方法对148例VAP患者痰培养病原学及药敏结果进行回顾性分析。结果2007年1～12月VAP发生率为70．81％，革兰阴性杆菌占62．31％，其中肺炎克雷伯菌、铜绿假单胞菌、大肠埃希菌和鲍曼不动杆菌为主要致病菌；革兰阳性球菌占30．94％，其中耐甲氧西林的金黄色葡萄球菌（MRSA）为主要致病菌：肺炎克雷伯菌和铜绿假单胞菌的耐药率很高，对该菌的常用抗生素敏感率均不理想。真菌感染的比例为6．76％。结论金黄色葡萄球菌、肺炎克雷伯菌、铜绿假单胞菌为ICU中VAP的主要致病菌并且耐药率高，G-杆菌仍然是VAP的主要致病菌，且表现出较高的耐药性。

关键词：呼吸机相关性肺炎细菌耐药性

水环境中溶解态腐殖酸对锌抗甲状腺激素干扰效应的影响

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环境科学 2017年第1期38卷 195-200页

作者：艾扬孔东东于畅沈扬李剑北京师范大学水科学研究院地下水污染控制与修复教育部工程研究中心北京100875

本文以重金属锌为研究对象,应用重组人甲状腺激素受体(h TR)基因酵母快速测试方法,检测溶解态腐殖酸对锌抗甲状腺激素干扰效应的影响,利用阳极溶出伏安法(ASV)检测溶解态腐殖酸与锌作用后,生物有效态锌含量的变化,同时利用三维荧光光谱... 详细信息

本文以重金属锌为研究对象,应用重组人甲状腺激素受体(h TR)基因酵母快速测试方法,检测溶解态腐殖酸对锌抗甲状腺激素干扰效应的影响,利用阳极溶出伏安法(ASV)检测溶解态腐殖酸与锌作用后,生物有效态锌含量的变化,同时利用三维荧光光谱中的激发-发射矩阵(3DEEM)技术初步考察腐殖酸与锌的作用机制.结果表明,氯化锌具有显著的抗甲状腺激素干扰效应,其RIC20(抑制率为20%时氯化锌的浓度)值为1.70×10-5mol·L^(-1),当腐殖酸与氯化锌作用后,其抗甲状腺激素干扰效应降低了30%~50%,ASV测试结果表明当腐殖酸和氯化锌溶液混合后,生物有效态锌含量明显降低,与生物测试结果相似;紫外照射腐殖酸与氯化锌的混合体系后,其抗甲状腺激素干扰效应上升,但仍低于未加腐殖酸氯化锌溶液的抗甲状腺激素干扰效应值;3DEEM的测试结果表明氯化锌能够降低腐殖酸荧光峰的荧光强度,能够直观地表征腐殖酸与氯化锌相互作用.上述结果可为研究环境水体中锌的生物毒性及锌水质基准的制定提供基础数据和理论支持.

关键词：溶解态腐殖酸锌甲状腺激素干扰效应阳极溶出伏安法三维荧光光谱

Transient extreme insulin resistance in a critically ill patient:A case report

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World Journal of Clinical Cases 2025年第8期13卷 35-40页

作者： Xiu-yu Wei Hsiu-Nien shen Department of Internal Medicine Taichung Veterans General HospitalTaichung 407TaiwanChina Department of Intensive Care Medicine Chi Mei Medical CenterTainan 710TaiwanChina

BACKGROUND Acute hyperglycemia due to insulin resistance is common in critically ill patients,typically managed with insulin ***,the occurrence of transient extreme insulin resistance(EIR)requiring exceptional high-dose insulin is *** SUMMARY We present the case of a 68-year-old woman with pneumonia who suffered an out-of-hospital cardiac arrest,subsequently developing transient EIR following a new episode of ***,insulin resistance rapidly reversed when the insulin infusion rate peaked at 960 units/hour(a total of 18224 units on that day),and it was promptly titrated down to zero upon achieving the target glucose *** Exceptional high-dose insulin infusion may be required in critically ill patients with stress-related EIR,which is typically *** should be aware of the phenomenon and cautious to avoid hypoglycemia and fluid overload during the steep titration of high-dose insulin infusion.

关键词： Hyperglycemia Insulin Insulin resistance Sepsis Critical illness Case report