Experimental Study on Multi-Jets Electrospinning via Screw Electrode

电纺纳米纤维在过滤材料、传感器、生物医疗、能量存储等领域都有着极其广阔的应用前景，而批量制备纳米纤维是其从实验室走向市场的关键。本文中提出一种基于螺杆电极的多射流静电纺丝装置，研究了多射流喷射调控规律，开发了带自清洁功能的储液滑块以实现纺丝溶液的持续、均匀供给，实现了纳米纤维的批量化稳定喷射。 通过ANSYS仿真分析了螺杆电极表面电场分布，完成带螺杆电极多射流静电纺丝平台机械结构与电气控制系统的设计开发；利用螺杆带动储液滑块往复运动，实现纺丝溶液的均匀涂布与持续供液；螺杆上螺牙增强了局部电场促进了射流的稳定喷射，保证多射流的持续电纺，提高纳米纤维产量；20min内螺杆电极静电纺丝纳米纤维最高...Electrospinning nanofibers have shown great potential in the fields of filter materials, textiles, bio-technology, tissue engineering, energy conversion etc. The massive production of nanofibers is the key to taking nanofibers from lab to industrialization. This paper proposes a multi-jets electrospinning method by using a screw as an electrode. An electrospinning system with self-cleaning functio...学位：工学硕士院系专业：航空航天学院_机械制造及其自动化学号：1992013115288

Electrohydrodynamic Direct-Write Mirco/Nano Three Dimensional Structure Based on Electrical Field Focusing

作为一种新颖的微纳制造技术，电纺直写技术已在信息、生物医疗、航空等应用领域显现出强大的潜力。增强射流稳定性、提高喷印沉积精度、诱导纤维叠加沉积，实现微纳三维成型是促进电纺直写技术应用发展的关键。本文引入辅助针尖构建聚焦电场增强对射流的引导与约束作用，以克服射流螺旋鞭动、提高喷射稳定性，实现了电纺直写高精度图案化喷印与微纳三维结构叠加沉积。 仿真分析了系统结构和工艺参数对聚焦电场的作用机制，优化电场聚焦电纺直写实验系统，进一步增强聚焦电场对射流的约束能力。实验研究了射流喷射沉积与流变行为的控制规律，研究发现通过减小施加电压、喷嘴至收集板距离、喷嘴内径有利于提高射流的稳定性，为高精度电纺直写提供...Electrohydrodynamic Direct Writing (EDW), which is a novel micro/nano-manufacturing technology, has shown great potential in the fields of information, biomedical and aerospace. Enhancing the stability and improving the deposition precision of charged jet to realize the micro/nano 3D molding, have been the key to expand the application of EDW. The focusing electrical field built up by the assistan...学位：工程硕士院系专业：航空航天学院_工程硕士(机械工程)学号：1992013115293

UVA Assisted 4-Thiothymidine for Cancer Treatment

This article reviews the developments of 4-thiothymidine analogues, assisted with UVA light, as a novel cancer therapy. First, the key points on synthetic chemistry, photochemistry and cellular toxicity of 4-thiothymidine are summarized. As the chemical structure of 4-thiothymidine is very similar to that of its parent thymidine, thus 4-thiothymidine can be readily incorporated into cellular DNA, and with the help of thymidine kinase, much more preferably into cancerous DNA. Unlike thymidine, 4-thiothymdine can absorb strongly in UVA (longer wavelengths of UV) light. Thus UVA-assisted 4-thiothymidine offers an effective cancer treatment. Some underlying mechanisms of action by 4-thiothymidine/UVA and compares this cancer approach with the commonly used photodynamic therapy are discussed. The various interactions between 4-thiothymidine with human serum albumin are introduced. Finally, a short conclusion on the past efforts and a brief prospect for future work in this exciting research field are given

Growth and Characterization of β-Ga2O3 Nanomaterials

β-Ga2O3是一种超宽禁带半导体材料（禁带宽度为4.9eV），具有很好的电学性质和光学性质，其击穿电场强度和巴利加优值比GaN和SiC更大，对可见光高度透明，在场效应晶体管、紫外透明电极、高温气体传感器和日盲光电探测器等方面应用广泛。 本文采用气-液-固（VLS）机制和气-固（VS）机制，通过热退火镀有金催化剂的GaN衬底制备出不同结构的β-Ga2O3纳米材料，并用扫描电子显微镜（SEM）、X射线能量色散谱（EDS）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）、X射线衍射（XRD）、拉曼光谱（Raman）、阴极荧光（CL）对样品的形貌、成分、微观结构和发光特性进行分析。讨论了实验...Monoclinic gallium oxide (β-Ga2O3) has a bandgap of 4.9 eV and expected dielectric strength and Baliga's figure of merit larger than those of GaN and SiC and promises high-performance power device applications. β-Ga2O3 materials with excellent electrical and optical properties have been extensively applied in ultraviolet transparent electrodes, high-temperature gas sensors, and solar-blind photode...学位：工学硕士院系专业：物理科学与技术学院_微电子学与固体电子学学号：1982014115297

银负载量对网状TiO柔性薄膜电极储锂性能的影响

采用水热法结合银镜反应制备出一系列不同Ag负载量（2.2%、4.0%、6.4%,w/w）改性的3D纳米网状结构Ag@Ti O2薄膜电极。利用电感耦合等离子体技术（ICP）、X射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）和X射线能谱（EDX）等表征手段测试所合成材料的形貌及成分,实验结果表明Ag纳米颗粒可以成功沉积在Ti O2纳米线表面。电化学测试数据则表明,4.0%（w/w）负载量的Ag@Ti O2相比于未改性和其他负载量的Ti O2纳米线具有更好的倍率性能和更稳定的可逆容量。在50,100,200,400,800和1 200 m A·g的电流密度条件下,该改性电极的放电容量可分别达到261.4,253.7,239.5,216.5,193.1和185.1 m Ah·g,在200 m A·g下循环80次后容量保持率仍能达到99.8%。国家自然科学基金(No.51604132)资助项目