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Aerosol jet printing of surface acoustic wave microfluidic devices

Microsystems & Nanoengineering 2024年第1期10卷 231-242页

作者： Joseph Rich Brian Cole Teng Li Brandon Lu Hanyu Fu Brittany N.Smith Jianping Xia Shujie Yang Ruoyu Zhong James L.Doherty Kanji Kaneko Hiroaki Suzuki zhenhua tian Aaron D.Franklin Tony Jun Huang Department of Biomedical Engineering Duke UniversityDurhamNC 27708USA Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA Department of Mechanical Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24061USA Thomas Lord Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA Deptartment of Precision Mechanics Faculty of Science and EngineeringChuo UniversityTokyo 112-8551Japan Department of Chemistry Duke UniversityDurhamNC 27708USA

The addition of surface acoustic wave(SAW)technologies to microfluidics has greatly advanced lab-on-a-chip applications due to their unique and powerful attributes,including high-precision manipulation,versatility,integrability,biocompatibility,contactless nature,and rapid ***,the development of SAW microfluidic devices is limited by complex and time-consuming micro/nanofabrication techniques and access to cleanroom facilities for multistep photolithography and vacuum-based *** simplify the fabrication of SAW microfluidic devices with customizable dimensions and functions,we utilized the additive manufacturing technique of aerosol jet *** successfully fabricated customized SAW microfluidic devices of varying materials,including silver nanowires,graphene,and poly(3,4-ethylenedioxythiophene)polystyrene sulfonate(PEDOT:PSS).To characterize and compare the acoustic actuation performance of these aerosol jet printed SAW microfluidic devices with their cleanroom-fabricated counterparts,the wave displacements and resonant frequencies of the different fabricated devices were directly measured through scanning laser Doppler ***,to exhibit the capability of the aerosol jet printed devices for lab-on-a-chip applications,we successfully conducted acoustic streaming and particle concentration ***,we demonstrated a novel solution-based,direct-write,single-step,cleanroom-free additive manufacturing technique to rapidly develop SAW microfluidic devices that shows viability for applications in the fields of biology,chemistry,engineering,and medicine.

关键词： printing wave fluid

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基于含铬革屑制备吸附-降解型胶原/ZnO复合材料

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高等学校化学学报 2024年第3期45卷 125-135页

作者：田振华高盼盼于若泓赵文杰陕西科技大学轻工科学与工程学院西安710021 陕西科技大学轻化工程国家级实验教学示范中心西安710021 兴业皮革科技股份有限公司泉州362000

危险废弃物含铬革屑的资源化利用是制革行业面临的一大难题.含铬革屑的主要成分胶原可作为吸附材料,但存在稳定性差、需解吸等问题,限制了其在水处理领域的应用.本文通过酸法从含铬革屑中提取胶原纤维并原位负载纳米氧化锌(ZnO)制备了吸... 详细信息

危险废弃物含铬革屑的资源化利用是制革行业面临的一大难题.含铬革屑的主要成分胶原可作为吸附材料,但存在稳定性差、需解吸等问题,限制了其在水处理领域的应用.本文通过酸法从含铬革屑中提取胶原纤维并原位负载纳米氧化锌(ZnO)制备了吸附-降解型胶原/ZnO复合材料.红外光谱及X射线衍射谱图显示,ZnO成功负载且呈片状,具有六角纤锌矿晶型,负载到胶原纤维上后并不会影响其自身的光响应范围,禁带宽度为3.20eV.当锌前驱体溶液浓度为0.12mol/L、胶原纤维分散液pH值为8、胶原海绵质量为60mg时,复合材料光催化性能最佳;在160min内对10mg/L亚甲基蓝(MB)的降解率达95.2%;循环5次后,降解率依然可达到87.5%.动力学模型拟合结果显示,复合材料对MB的吸附更符合拟二级吸附动力学模型,受化学吸附控制;MB的光催化降解过程符合一级降解动力学方程,降解速率最高为0.0172min^(-1).此外,ZnO的引入提高了复合材料的抗菌性和热稳定性.

关键词：胶原氧化锌亚甲基蓝吸附性能光催化降解

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创伤叙事、意识流与精神反思——论毕飞宇《欢迎来到人间》的当下知识分子书写

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中国现代文学论丛 2024年第1期19卷 152-162页

作者：田振华江苏师范大学文学院

毕飞宇的长篇小说新作《欢迎来到人间》,第一次真正意义上做到了对当下时代现实的正面强攻。作品塑造了一系列在全球化时代颇具“现代性”的当下知识分子人物形象。作者对主人公自救和救他的书写中,通过意识流等现代手法的使用,将主人... 详细信息

毕飞宇的长篇小说新作《欢迎来到人间》,第一次真正意义上做到了对当下时代现实的正面强攻。作品塑造了一系列在全球化时代颇具“现代性”的当下知识分子人物形象。作者对主人公自救和救他的书写中,通过意识流等现代手法的使用,将主人公的心灵和精神创伤——揭示出来。作者让我们看到大时代中现代人复杂精神世界的同时,也透过知识分子个体的爱与痛的书写,展现对当下时代的隐忧和人性的反思。

关键词：《欢迎来到人间》创伤叙事意识流精神反思知识分子书写

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DHDAS软件在研究生模态识别教学中的应用

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实验室研究与探索 2024年第6期43卷 147-152页

作者：汪敏蒋伟杨朝山田镇华陆军勤务学院地下建筑工程重点实验室重庆401311

模态识别是结构健康监测教学中的重要环节。依托某地下建筑工程实验室多年健康监测研究成果及设备环境条件,在传统理论教学模式上,将DHDAS软件及其所涉及的分析方法与应用工具引入研究生模态识别课程。以“混凝土简支桥梁模态识别方案... 详细信息

模态识别是结构健康监测教学中的重要环节。依托某地下建筑工程实验室多年健康监测研究成果及设备环境条件,在传统理论教学模式上,将DHDAS软件及其所涉及的分析方法与应用工具引入研究生模态识别课程。以“混凝土简支桥梁模态识别方案设计”为主题,构建了课堂讲解-现场演示-模拟操作-数据处理的多元化教学模式,并通过现场试验进一步论证了该模式的实用性。结果表明,学生通过课程学习掌握了DHDAS软件在模态识别中的相关分析方法与应用技能,达到了设计实践与理论支撑相结合的目的。

关键词：试验教学研究生模态识别 DHDAS软件健康监测

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Fe基拉瓦锡骨架材料(MILs)的制备与应用进展

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精细化工 2024年第1期41卷 38-48,90页

作者：田振华何静瑄侯晨陕西科技大学轻工科学与工程学院陕西西安710021 轻化工程国家级实验教学示范中心陕西西安710021 兴业皮革科技股份有限公司福建泉州362000

金属-有机骨架化合物(MOFs)是由无机金属离子或离子簇与有机配体配位而成的一类具有周期性网状结构的新型多孔晶体材料。在众多MOFs材料中,Fe基拉瓦锡骨架材料(MILs)因具有良好的生物相容性、独特的骨架柔性、突出的比表面积及高度稳定... 详细信息

金属-有机骨架化合物(MOFs)是由无机金属离子或离子簇与有机配体配位而成的一类具有周期性网状结构的新型多孔晶体材料。在众多MOFs材料中,Fe基拉瓦锡骨架材料(MILs)因具有良好的生物相容性、独特的骨架柔性、突出的比表面积及高度稳定性,在医学、传感、催化等领域具有广泛的应用前景。研究者们通过合成方法创新、结构修饰以及与其他材料复合等方式对Fe基MILs的结构与性能进行优化,进一步提升了Fe基MILs及相关材料的实际应用效果、扩展了应用范围。该文从Fe基MILs的种类及其结构特征入手,重点综述了其常见的合成方法、调控因素及改性方法,总结了Fe基MILs在药物载体、传感、吸附和催化方面的应用进展,在此基础上讨论了Fe基MILs在上述领域中的应用优势及局限性,并对其发展趋势进行了展望。

关键词： Fe基MILs 合成方法改性方法药物载体传感吸附催化

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Recent Advance in Electrocatalytic Water Splitting for Hydrogen Production by Layered Double Hydroxides

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Chemical Research in Chinese Universities 2024年第4期40卷 577-589页

作者： XIA tian REN Qinghui YANG Jiangrong LI zhenhua SHAO Mingfei DUAN Xue State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing100029P.R.China Quzhou Institute for Innovation in Resource Chemical Engineering Quzhou324000P.R.China

Collecting green hydrogen(H2)from water splitting driven by renewable energy is a new competition to implement the construction of H2 energy industry and promote new economic growth for global *** common strategy to enhance the efficiency of H2 production is to reduce the potential of electrolytic cell that is the mainstream way to prepare efficient *** double hydroxides(LDHs)are one of the most active electrocatalysts with adjustable active sites in contemporary *** this review,we discuss the recent advanced progress of LDHs for hydrogen evolution reaction(HER)on cathode and oxygen evolution reaction(OER)or organic oxidation on anode and emphasize the influence of LDHs structure regulation in water electrolysis process(HER/OER)as well as the current development status of organic oxidation catalyzed by active oxygen species on ***,we propose the current challenges of LDHs in electrocatalysis and prospect their developing tendency and further application.

关键词： Layered double hydroxide Hydrogen production Hydrogen evolution reaction(HER) Oxygen evolution reaction(OER) Electrocatalytic organic oxidation

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Study on the Preparation and Antileukemic Activity of New Lipophilic 1-β-D-arabinofuranosylcytosine Derivatives

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Journal of Ocean University of China 2018年第2期17卷 385-391页

作者： CHU Yanyan tian zhenhua HOU Yingwei LI Wenbao School of Medicine and Pharmacy Ocean University of ChinaQingdao 266003China Innovation Center for Marine Drug Screening and Evaluation Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Marine Biomedical Research Institute of Qingdao Qingdao 266003China

Cytarabine(1-β-D-arabinofuranosylcytosine, Ara-C), isolated from a Caribbean sponge species Tethyacrypta, is the first antitumor drug from a marine resource. In 1980, the US Food and Drug Administration approved this drug for the treatment of different types of leukemia. This drug has a short plasma half-life, low stability, limited bioavailability, and severe side effects. To improve stability and bioavailability, we synthesized nine novel derivatives by blocking the cytarabine metabolic sites and improving lipophilicity. The c Log P values of the newly synthesized compounds were calculated. All the synthesized compounds were more lipophilic than cytarabine, resulting in membrane permeability and bioavailability improvement. The antitumor activities against leukemia cell line HL-60 were evaluated by using the MTT assay. The bioassay results revealed that the IC_(50) values of compounds 5, 8 and 9 were 0.080, 0.090 and 0.057 μmol L^(-1), respectively, which was similar with that of cytarabine(0.056 μmol L^(-1),). In comparison, compound 4 with a phosphate group at O5' was inactive. Because phosphoester bonds are easily hydrolyzed by alkaline phosphatase and are commonly used in producing prodrug strategies, compound 4 might also be metabolized in vivo and generate compound 3 or even cytarabine through a multi-step reaction. Thus, compound 4 might be a promising compound to be developed as a prodrug.

关键词： cytarabine leukemia marine drug prodrug antitumor drug

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Mechanical robust and self-healing flexible perovskite solar cells with efficiency exceeding 23%

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Science China Chemistry 2024年第8期67卷 2670-2678页

作者： Yaohua Wang Ruikun Cao Yuanyuan Meng Bin Han Ruijia tian Xiaoyi Lu zhenhua Song Shuncheng Yang Congda Lu Chang Liu Ziyi Ge College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials TechnologyEngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049China

Flexible perovskite solar cells(f-PSCs) have experienced rapid advancements due to the light-weight, flexibility, and solution processability of the perovskite materials, which prompted the power conversion efficiency(PCE) to 24.08%. However, f-PSCs still face challenges in terms of mechanical and environmental stability. This is primarily due to their inherent brittleness, the presence of residual tensile strain, and the high density of defects along the boundaries of perovskite grains. To this end, we carefully developed a cross-linkable elastomers 3-[(3-acrylamidopropyl)dimethylammonium] propanoate(ADP) with electrostatic dynamic bond, which could be in-situ cross-linked and coordinate with [Pb I6]4-to regulate the crystallization process of perovskite. The cross-linked elastomers attached to the perovskite grain boundaries could release the remaining tensile strains and mechanical stresses, leading to enhanced stability and flexibility of the f-PSCs. More importantly, the electrostatic interaction between positive and negative groups of cross-linked elastomers and hydrogen bond formation between N–H and C=O accelerate the cross-linking of ADP, endowing the flexible perovskite films with self-healing ability under mild treating conditions(60 °C for 30 min). As a result, the device achieves a remarkable PCE of 23.53%(certified 23.16%). Additionally, the device exhibits impressive mechanical sustainability and durability, retaining over 90% of initial PCE even after undergoing8,000 bending cycles.

关键词： Mechanical robust and self-healing flexible perovskite solar cells with efficiency exceeding 23

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MXene Sediment-Based Poly(vinyl alcohol)/Sodium Alginate Aerogel Evaporator with Vertically Aligned Channels for Highly Efficient Solar Steam Generation

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Nano-Micro Letters 2024年第10期16卷 638-654页

作者： tian Wang Meng Li Hongxing Xu Xiao Wang Mingshu Jia Xianguang Hou Shuai Gao Qingman Liu Qihang Yang Mingwei tian Lijun Qu zhenhua Song Xiaohu Wu Lili Wang Xiansheng Zhang Shandong Key Laboratory of Medical and Health Textile Materials College of Textiles and ClothingState Key Laboratory of Bio-Fibers and Eco-TextilesResearch Center for Intelligent and Wearable TechnologyQingdao UniversityQingdao 266071People's Republic of China Department of Pharmacology Qingdao University School of PharmacyQingdao UniversityQingdao 266071People's Republic of China Shandong Institute of Advanced Technology Jinan 250100People's Republic of China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266061People's Republic of China

Solar-driven interfacial evaporation from seawater is considered an effective way to alleviate the emerging freshwater crisis because of its green and environmentally friendly ***,developing an evaporator with high efficiency,stability,and salt resistance remains a key ***,with an internal photothermal conversion efficiency of 100%,has received tremendous research interest as a photothermal ***,the process to prepare the MXene with monolayer is inefficient and generates a large amount of“waste”MXene sediments(MS).Here,MXene sediments is selected as the photothermal material,and a three-dimensional MXene sediments/poly(vinyl alcohol)/sodium alginate aerogel evaporator with vertically aligned pores by directional freezing method is innovatively *** vertical porous structure enables the evaporator to improve water transport,light capture,and high evaporation *** swabs and polypropylene are used as the water channel and support,respectively,thus fabricating a self-floating *** evaporator exhibits an evaporation rate of 3.6 kg m_(-2)h^(-1)under one-sun illumination,and 18.37 kg m^(-2)of freshwater is collected in the condensation collection device after 7 h of outdoor sun *** evaporator also displays excellent oil and salt *** research fully utilizes“waste”MS,enabling a self-floating evaporation device for freshwater collection.

关键词： MXene sediments Porous structure Desalination Self-floating

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Fibroblast growth factor 21 inhibits ferroptosis following spinal cord injury by regulating heme oxygenase-1

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Neural Regeneration Research 2024年第7期19卷 1568-1574页

作者： Qi Gu Weiping Sha Qun Huang Jin Wang Yi Zhu tianli Xu zhenhua Xu Qiancheng Zhu Jianfei Ge Shoujin tian Xiaolong Lin Department of Orthopaedic Surgery Zhangjiagang Hospital Affiliated to Soochow UniversitySuzhouJiangsu ProvinceChina Orthopedics Laboratory The First People’s Hospital of Zhangjiagang CitySuzhouJiangsu ProvinceChina Department of Anesthesiology Zhangjiagang Hospital Affiliated to Soochow UniversitySuzhouJiangsu ProvinceChina

Interfering with the ferroptosis pathway is a new strategy for the treatment of spinal cord *** growth factor 21 can inhibit ferro ptosis and promote neurofunctional recovery,while heme oxygenase-1 is a regulator of iron and reactive oxygen species *** relationship between heme oxygenase-1and ferroptosis remains controve *** this study,we used a spinal co rd injury rat model to show that the levels of fibroblast growth factor 21 in spinal co rd tissue decreased after spinal cord *** addition,there was a significant aggravation of ferroptosis and a rapid increase in heme oxygenase-1 expression after spinal cord *** r,heme oxygenase-1 aggravated fe rroptosis after spinal cord injury,while fibroblast growth factor 21 inhibited fe rroptosis by downregulating heme ***,the activation of fibroblast growth factor 21 may provide a potential treatment for spinal co rd *** findings could provide a new potential mechanistic explanation for fibroblast growth factor 21 in the treatment of spinal cord injury.

关键词： ferroptosis fibroblast growth factor 21 functional recovery heme oxygenase-1 lipid peroxidation neuron reactive oxygen species spinal cord injury

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