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Preparation of PVA/GO/h-BN Janus Film with High Thermal Conductivity and Excellent Flexibility via a Density Deposition Self-assembly Method

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Chinese Journal of Polymer Science 2024年第8期42卷 1217-1226页

作者： fang-Hua luo Zhi-Tao Dong Guo-Hua Chen Chen Ma Huai-Yuan Wang College of Chemistry and Chemical Engineering Northeast Petroleum UniversityDaqing 163318China College of Materials Science and Engineering Huaqiao UniversityXiamen 361000China School of Chemical Engineering and Technology and State Key Laboratory for Chemical Engineering Tianjin UniversityTianjin 300350China

Janus films with asymmetric physical/chemical properties have attracted con siderable attention due to their promising applications in personal thermal management,electronic skin s,sensors,actuators,***,traditional methods for fabricating Janus films conventionally need the assistance of an interface or auxiliary equipment,which are usually complex and ***,flexible poly(vinyl alcohol)(PVA)/graphene oxide(GO)/h-BN(recorded as PVA/GO/h-BN)Janus films with thermally,optically,and electrically anisotropic properties are fabricated by a simple density deposition self-assem bly method,which just utilizes the density difference between GO and h-BN during water *** results show that the two sides of the acquired Janus films have obvious asymmetric *** the original state of the PVA/GO/h-BN Janus films,the thermal conductivity of the GO side(10.06 W·m^(-1)·K^(-1))is generally lower than that of the h-BN side(10.48W·m^(-1)·K^(-1)).But after GO is reduced,the thermal conductivity of the rGO side reaches 12.17 W·m^(-1)·K^(-1),surpassing that of the h-BN *** addition,the relative reflectance of the h-BN side of Janus film is also significantly higher than that of the rGO side,and the su rface resistance difference between the two sides is about 4 orders of *** prepared PVA/GO/h-BN Janus films show great application potential in human thermal management,light conversion switches,and electronic *** study provides a simple and versatile strategy for fabricating Janus films with multifunctional(such as thermal,optical,and electrical)anisotropies.

关键词： Janus films PVA/GO/h-BN Density deposition self-assembly method

Electrically-driven ultrafast out-of-equilibrium light emission from hot electrons in suspended graphene/hBN heterostructures

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International Journal of Extreme Manufacturing 2024年第1期6卷 328-338页

作者： Qiang Liu Wei Xu Xiaoxi Li Tongyao Zhang Chengbing Qin fang luo Zhihong Zhu Shiqiao Qin Mengjian Zhu Kostya S Novoselov College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano-optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaHunan 410073People’s Republic of China Nanhu Laser Laboratory National University of Defense TechnologyChangshaHunan 410073People’s Republic of China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006People’s Republic of China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China Institute for Functional Intelligent Materials National University of SingaporeSingapore 117544Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

Nanoscale light sources with high speed of electrical modulation and low energy consumption are key components for nanophotonics and *** record-high carrier mobility and ultrafast carrier dynamics of graphene make it promising as an atomically thin light emitter which can be further integrated into arbitrary platforms by van der Waals ***,due to the zero bandgap,graphene is difficult to emit light through the interband recombination of carriers like conventional ***,we demonstrate ultrafast thermal light emitters based on suspended graphene/hexagonal boron nitride(Gr/hBN)*** in biased graphene are significantly heated up to 2800 K at modest electric fields,emitting bright photons from the near-infrared to the visible spectral *** eliminating the heat dissipation channel of the substrate,the radiation efficiency of the suspended Gr/hBN device is about two orders of magnitude greater than that of graphene devices supported on SiO2or *** demonstrate that hot electrons and low-energy acoustic phonons in graphene are weakly coupled to each other and are not in full thermal *** cooling ofhigh-temperature hot electrons to low-temperature acoustic phonons is enabled by the significant near-field heat transfer at the highly localized Gr/hBN interface,resulting in ultrafast thermal emission with up to 1 GHz bandwidth under electrical *** is found thatsuspending the Gr/hBN heterostructures on the SiO2trenches significantly modifies the light emission due to the formation of the optical cavity and showed a~440%enhancement inintensity at the peak wavelength of 940 nm compared to the black-body thermal *** demonstration of electrically driven ultrafast light emission from suspended Gr/hBNheterostructures sheds the light on applications of graphene heterostructures in photonicintegrated circuits,such as broadband light sources and ultrafast thermo-optic phase modulat

关键词： suspended graphene ultrafast light emitter van der Waals heterostructures thermal radiation electron–phonon interaction

Application of artificial synapse based on all-inorganic perovskite memristor in neuromorphic computing

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Nano Materials Science 2024年第1期6卷 68-76页

作者： fang luo Wen-Min Zhong Xin-Gui Tang Jia-Ying Chen Yan-Ping Jiang Qiu-Xiang Liu School of Physics&Optoelectric Engineering Guangdong University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou510006China

Artificial synapse inspired by the biological brain has great potential in the field of neuromorphic computing and artificial *** memristor is an ideal artificial synaptic device with fast operation and good ***,we have prepared a memristor device with Au/CsPbBr_(3)/ITO *** memristor device exhibits resistance switching behavior,the high and low resistance states no obvious decline after 400 switching *** memristor device is stimulated by voltage pulses to simulate biological synaptic plasticity,such as long-term potentiation,long-term depression,pair-pulse facilitation,short-term depression,and short-term *** transformation from short-term memory to long-term memory is achieved by changing the stimulation *** addition,a convolutional neural network was constructed to train/recognize MNIST handwritten data sets;a distinguished recognition accuracy of~96.7%on the digital image was obtained in 100 epochs,which is more accurate than other memristor-based neural *** results show that the memristor device based on CsPbBr3 has immense potential in the neuromorphic computing system.

关键词： Memristor CsPbBr_(3) Resistive switching Artificial synapse Neuromorphic computing

Rheum palmatum L. and Salvia miltiorrhiza Bge. Alleviates Acute Pancreatitis by Regulating Th17 Cell Differentiation: An Integrated Network Pharmacology Analysis, Molecular Dynamics Simulation and Experimental Validation

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Chinese Journal of Integrative Medicine 2024年第5期30卷 408-420页

作者： FENG Min-chao luo fang HUANG Liang-jiang LI Kai CHEN Zu-min LI Hui YAO Chun QIN Bai-jun CHEN Guo-zhong The First Clinical Medical College Guangxi University of Traditional Chinese MedicineNanning 530000China Guangxi Key Laboratory of Molecular Biology of Traditional Chinese Medicine and Preventive Medicine Nanning 530000China Graduate School Guangxi University of Traditional Chinese MedicineNanning 530000China Department of Gastroenterology the First Affiliated Hospital of Guangxi University of Traditional Chinese MedicineNanning 530023China

Objective: To identify the core targets of Rheum palmatum L. and Salvia miltiorrhiza Bge.,(Dahuang-Danshen, DH-DS) and the mechanism underlying its therapeutic efficacy in acute pancreatitis(AP)using a network pharmacology approach and validate the findings in animal experiments. Methods: Network pharmacology analysis was used to elucidate the mechanisms underlying the therapeutic effects of DH-DS in AP. The reliability of the results was verified by molecular docking simulation and molecular dynamics ***, the results of network pharmacology enrichment analysis were verified by immunohistochemistry,Western blot analysis and real-time quantitative PCR, respectively. Results: Sixty-seven common targets of DH-DS in AP were identified and mitogen-activated protein kinase 3(MAPK3), Janus kinase 2(JAK2), signal transducer and activator of transcription 3(STAT3), protein c-Fos(FOS) were identified as core targets in the protein interaction(PPI) network analysis. Gene ontology analysis showed that cellular response to organic substance was the main functions of DH-DS in AP, and Kyoto Encyclopedia of Genes and Genomes analysis showed that the main pathway included Th17 cell differentiation. Molecular docking simulation confirmed that DH-DS binds with strong affinity to MAPK3, STAT3 and FOS. Molecular dynamics simulation revealed that FOS-isotanshinone Ⅱ and STAT3-dan-shexinkum d had good binding capacity. Animal experiments indicated that compared with the AP model group, DH-DS treatment effectively alleviated AP by inhibiting the expression of interleukin-1β, interleukin-6 and tumor necrosis factor-α, and blocking the activation of Th17 cell differentiation(P<0.01). Conclusion: DH-DS could inhibit the expression of inflammatory factors and protect pancreatic tissues,which would be functioned by regulating Th17 cell differentiation-related m RNA and protein expressions.

关键词： Rheum palmatum L. Salvia miltiorrhiza Bge. molecular docking simulation network pharmacology acute pancreatitis Th17 cell differentiation

基于原子力显微镜的红外光谱在聚合物领域的应用进展

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合成树脂及塑料 2024年第3期41卷 50-55,69页

作者：罗放中石化(北京)化工研究院有限公司北京100013

综述了近年来基于原子力显微镜的红外光谱(AFM-IR)在高分子科学、材料科学等领域的应用进展,着重突出了AFM-IR在表征不同试样时的优势。AFM-IR克服了传统表征手段的诸多缺点,可以在纳米尺度上获得试样的化学组成信息,且表征精确性高,检... 详细信息

综述了近年来基于原子力显微镜的红外光谱(AFM-IR)在高分子科学、材料科学等领域的应用进展,着重突出了AFM-IR在表征不同试样时的优势。AFM-IR克服了传统表征手段的诸多缺点,可以在纳米尺度上获得试样的化学组成信息,且表征精确性高,检测过程对试样无损,因而在聚合物、复合材料以及薄膜材料等领域获得了长足的发展,为研究聚合物构效关系、改善多种材料性能提供了重要助力。

关键词：原子力显微镜-红外光谱高分子聚合物

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地下芽植物芽库密度响应环境干扰的Meta分析

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Journal of Plant Ecology 2024年第3期17卷 28-38页

作者： Tao fang Duo Ye Ju-Juan Gao fang-Li luo Yao-Jun Zhu Fei-Hai Yu School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China College of Life Sciences Zhejiang Normal UniversityJinhua 321000China Fujian MinJiang River Estuary Wetland National Nature Reserve Administrative Offce Fuzhou 350200China The Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration Beijing 100083China Institute of Ecological Conservation and Restoration Chinese Academy of ForestryBejing 100083China National Positioning Observatory for Mangrove Wetland Ecosystems Zhanjiang 524448China Institute of Wetland Ecology&Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation Taizhou UniversityTaizhou 318000China

地下芽库是地下芽植物地下储存器官产生的无性繁殖体的集合,是地下芽植物繁殖的主要方式。地下芽库密度反映了地下芽植物群落的潜在更新能力。然而,不同的扰动和生境类型对地下芽库密度的影响尚缺乏全面的了解;此外,不同类型地下芽库对... 详细信息

地下芽库是地下芽植物地下储存器官产生的无性繁殖体的集合,是地下芽植物繁殖的主要方式。地下芽库密度反映了地下芽植物群落的潜在更新能力。然而,不同的扰动和生境类型对地下芽库密度的影响尚缺乏全面的了解;此外,不同类型地下芽库对不同扰动类型的响应是否存在差异也不明确。本研究通过Meta分析系统收集了环境扰动对地下芽库密度影响的相关文献,计算了不同扰动和生境类型对各地下芽库类型密度影响的累计效应值。结果发现,由于地下芽库对扰动的响应存在相反或波动的特征,整体上环境扰动对地下芽库密度的影响较小,而干旱对芽库密度具有负效应。总体而言,环境扰动降低了根状茎芽的密度,但增加了分蘖芽的密度。环境扰动降低了湿地中的地下芽库密度,但在其它生境类型中并未发现显著影响。因此,地下芽植物的芽库对扰动有着很强的抗性和弹性,地下芽库的密度变化取决于扰动的类型、分布的生境和受扰动的芽库类型。

关键词：无性繁殖体地下芽植物生境类型扰动类型地下发芽器官

基于AFM-IR的高分子聚合物添加剂定量检测新方法

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合成树脂及塑料 2024年第2期41卷 30-33页

作者：罗放中石化(北京)化工研究院有限公司北京100013

基于原子力-红外检测平台开发了一种定量检测聚合物中少量添加剂的方法。通过表征不同抗氧剂168含量的聚丙烯试样,统计不同试样特征红外吸收峰处的红外图像高亮点占比和平均信号强度变化,成功绘制了抗氧剂含量标准曲线,拟合度高达0.9967... 详细信息

基于原子力-红外检测平台开发了一种定量检测聚合物中少量添加剂的方法。通过表征不同抗氧剂168含量的聚丙烯试样,统计不同试样特征红外吸收峰处的红外图像高亮点占比和平均信号强度变化,成功绘制了抗氧剂含量标准曲线,拟合度高达0.9967,这一方法可用于未知试样中不同添加剂含量的检测。

关键词：原子力-红外技术抗氧剂聚丙烯定量检测

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固体碳源用于污水深度脱氮的研究进展

中国给水排水 2024年第8期40卷 34-39页

作者：罗方周齐鲁中国人民大学环境学院低碳水环境技术研究中心北京100872

为控制严重的水体富营养化问题,满足日趋严格的污水排放标准,污水厂在利用生物反硝化技术进行深度脱氮时大多需要投加外碳源。常见的外碳源可分为液体碳源与固体碳源两类,其中固体碳源近年来引起了国内外的广泛关注。系统总结了固体碳... 详细信息

为控制严重的水体富营养化问题,满足日趋严格的污水排放标准,污水厂在利用生物反硝化技术进行深度脱氮时大多需要投加外碳源。常见的外碳源可分为液体碳源与固体碳源两类,其中固体碳源近年来引起了国内外的广泛关注。系统总结了固体碳源的物质类型,阐述了固相反硝化系统释碳与脱氮的相关原理,综述了近年来固体碳源在污水深度处理中的应用研究进展,并基于上述内容提出了对固体碳源未来研究的展望。相较于液体碳源,固体碳源既是反硝化过程持续的电子供体,又可作为生物膜生长的载体,相关工艺简单易于控制,脱氮效果稳定,为未来污水深度处理技术的发展提供了一条新思路。

关键词：固体碳源固相反硝化生物脱氮污水深度处理

托法替布通过JAK/STAT通路抑制系统性硬化症小鼠皮肤纤维化

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免疫学杂志 2024年第3期40卷 259-264页

作者：罗芳叶俏嘉兴市第二医院风湿免疫科 314000

目的研究托法替布对博莱霉素诱导的系统性硬化病小鼠皮肤纤维化的抑制作用及机制。方法24只Balb/c小鼠分为4组:为空白组、模型组、早期干预组、晚期干预组,其中模型组、2组干预组博来霉素皮下注射制造系统性硬化症小鼠模型,空白组小鼠... 详细信息

目的研究托法替布对博莱霉素诱导的系统性硬化病小鼠皮肤纤维化的抑制作用及机制。方法24只Balb/c小鼠分为4组:为空白组、模型组、早期干预组、晚期干预组,其中模型组、2组干预组博来霉素皮下注射制造系统性硬化症小鼠模型,空白组小鼠皮下注射等量生理盐水,早期干预组自造模开始给予托法替布灌胃处理,晚期干预组自造模第8天给予托法替布灌胃处理。HE染色和Masson染色观察组织病理改变;ELISA方法检测血清IL-6水平;水解法检测皮损组织羟脯氨酸含量;RT-PCR方法测p-JAK1、p-JAK2、p-JAK3、p-STAT3 mRNA的表达;Western blot检测皮损组织中p-JAK1、p-JAK2、p-JAK3、p-STAT3、I型胶原纤维及α-平滑肌蛋白的表达量。结果模型组小鼠相较空白组真皮层增厚,胶原纤维增多,托法替布干预后真皮层变薄,胶原纤维相对减少,早期干预组较晚期干预组真皮层相较对更薄(P<0.05);晚期干预较模型组IL-6水平显著下降(P<0.05);早期干预组较模型组p-JAK2、p-JAK3 mRNA表达量均减少(P<0.05),早期干预组较模型组p-JAK1、p-JAK3、p-STAT3蛋白表达量均减少(P<0.05),早期干预组p-JAK1蛋白表达量较晚期干预组减少(P<0.05)。结论托法替布可通过抑制JAK/STAT信号通路,改善系统性硬化症小鼠皮肤纤维化,且托法替布早期干预起到的抗纤维化作用更明显。

关键词：系统性硬化症托法替布纤维化 JAK/STAT通路