前驱物结晶体升华成膜法制备TiO2薄膜及其光催化性研究

采用“前驱物结晶体升华成膜法”工艺，使含钛前驱物结晶体草酸氧钛酸以升华的方式，均匀地在玻璃表面形成前驱物薄膜；经过热处理，制备出外观平整透明的玻璃基TiO2薄膜，其薄膜厚度为80-100nm，粒度≤50nm。初步研究了制备条件、薄膜性能和本工艺制备的玻璃基TiO2纳米薄膜对甲基对硫磷的光催化降解性能。     

石墨烯在装备技术相关领域的应用研究(一)

从自上而下、自下而上两方面综述了石墨烯的制备方法,介绍了石墨烯基复合材料在气敏传感器、电化学传感器、光学与应力传感器等传感器领域的研究热点与进展,并比较了不同应用中的物理机制与理论解释,为石墨烯在装备技术领域的应用提供参考。最后提出了如何实现高质量石墨烯的量产,提高单层/单晶石墨烯的质量,如何实现石墨烯与其他材料的更好复合,以及石墨烯基材料性能提高的机制等将是今后石墨烯应用领域研究中重点。     

Study of high-tech process furnace using inherently safer design strategies (I) temperature distribution model and process effect

High-tech industries, such as those producing semiconductor and TFT-LCD (Thin Film Transistor Liquid Crystal Display), have recently become the most important economic activities in Taiwan. Each of these industries has a complete chain of supply from raw material production, production pre-processing, product manufacturing, to waste handling. Any company in the chain is a critical component, since any accidents of fire, explosion, gas leakage, or power outage would cut off the supply chain, causing inability of continuous operation. In industries of semiconductor and TFT-LCD, great amounts of special gases and chemicals with many machinery equipments are used in the production processes. In cases of accidents or improper installation, this chain of supply, from raw material production, preproduction, product manufacturing, to waste handling materials and equipments may cause severe damages or incidents.This study used the existing model of the horizontal furnace to develop a simulation program. The simulation results were consistent with the existing model, and produced even slightly better results on temperature distribution and temperature sensitivity. The simulation model applied on a vertical furnace could provide data on furnace temperature control for industrial use. Meanwhile, this study also deduced actual temperature control and an ISD strategy, which are consistent with design strategy principles.The validation results on the proposed temperature distribution model suggested that the model can be applied in temperature distribution and sensitivity analysis to obtain adjustment and control models for various heating zones. In the case of a single tool, when processing reduction is 60 pieces, switching off the two heating zones can reduce 44% of power output, for a capacity utilization rate of 93.7% for the entire plant. The application of the proposed temperature control model can reduce power consumption by 121.4 kWh. In addition, with the same number of tools, facilities layouts in two cases have an area difference of 41.4775 m², thus shortening the evacuation time for operators. The experimental results proved that the proposed model has realized the ISD principles of intensification, attenuation, and limitation of effects.     

仿生SiC陶瓷材料的制备和性能

仿生SiC陶瓷材料是一种新兴的环境友好材料,因其具有密度低、强度高、耐腐蚀、耐磨损、抗氧化和生物相容性好等优点,在机械、化工、催化、生物医学等领域都有着广阔的应用前景。就仿生SiC陶瓷材料的多种制备工艺和其机械性能、热性能、电性能、生物相容性等进行了综述,并对其存在的问题进行了分析,对其发展趋势进行了展望。     

多层陶瓷电容器应用与可靠性研究

多层陶瓷电容器(MLCC)在使用过程中电参数会发生不同程度的退化甚至超差失效,降低了其可靠性。引起失效的原因可分为损耗性失效、过应力失效、内部缺陷失效以及外部缺陷失效四类。基于日常失效分析工作中遇到的多层陶瓷电容器失效问题,结合国内外文献调研资料,首先对多层陶瓷电容器制造工艺进行了分析,然后对烧结裂纹、分层及空洞三种内在缺陷以及使用过程中外部应力引起的装配裂纹、热应力裂纹、弯曲裂纹、银迁移等失效模式及其相应的微观失效机理展开了深入讨论,最后对上述失效提出了相应建议和预防措施。     

Hydrothermal fabrication and visible-light-driven photocatalytic properties of bismuth vanadate with multiple morphologies and/or porous structures for Methyl Orange degradation

Monoclinic BiVO₄ with multiple morphologies and/or porous structures were fabricated using the hydrothermal strategy. The materials were characterized by means of the XRD, Raman, TGA/DSC, SEM, XPS, and UV-Vis techniques. The photocatalytic activities of the BiVO₄ materials were evaluated for the degradation of Methyl Orange under visible-light irradiation. It is observed that pH value and surfactant exerted a great effect on the morphology and pore structure of the BiVO₄ product. Spherical BiVO₄ with porous structures, flower-cluster-like BiVO₄, and flower-bundle-like BiVO₄ were generated hydrothermally at 100℃ with poly(vinyl pyrrolidone) (PVP) and urea (pH = 2) and at 160℃ with NaHCO₃ (pH = 7 and 8), respectively. The PVP-derived BiVO₄ showed much higher surface areas (5.0-8.4 m²/g) and narrower bandgap energies (2.45-2.49 eV). The best photocatalytic performance of the spherical BiVO₄ material with a surface area of 8.4 m²/g was associated with its higher surface area, narrower bandgap energy, higher surface oxygen vacancy density, and unique porous architecture.     

基于LCA方法评价多晶硅片生产的环境影响

多晶硅片制造是光伏产品生命周期过程中能耗及环境影响较大的环节之一.以四川某硅片企业一期(国内普遍水平)和二期(国内较先进水平)的实际生产数据为例,运用生命周期评价方法的分类、特征化、量化处理方法,定量计算单位多晶硅片生产的环境影响,计算结果显示:国内较先进水平比普遍水平提高了资源、能源的利用率,减少了污染物的环境排放,尤其表现在粉尘排放量、酸化潜值、全球变暖值和臭氧消耗潜值方面;并提出国内多晶硅片企业节能减排方法技术方法为利用清洁能源,提高循环水利用率,改进铸锭工艺,增大晶锭中晶粒的尺寸,改用环境污染物排放较少的硅片清洗原料.     

Hybrid hierarchical fabrication of three-dimensional scaffolds

Three-dimensional (3D) porous structures facilitating cell attachment, growth, and proliferation is critical to tissue engineering applications. Traditional solid freeform fabrication (SFF) methods have limited capabilities in the fabrication of high resolution micro-scale features to implement advanced biomedical functions. In this work, we present a hybrid scaffold fabrication approach by integrating electrohydrodynamic (EHD) printing technology with extrusion deposition together to fabricate hierarchical 3D scaffolds with well controlled structures at both macro and micro scale. We developed a hybrid fabrication platform and a robust fabrication process to achieve 3D hierarchical structures. The melting extrusion by pneumatic pressure was used to fabricate 3D scaffolds with filaments dimension of hundreds of microns using thermoplastic biopolymer polycaprolactone (PCL). An electrohydrodynamic (EHD) melt jet plotting process was developed to fabricate micro-scale features on the scaffolds with sub-10 μm resolution, which has great potential in advanced biomedical applications, such as cell alignment and cell guidance.     

化学机械研磨废水处理及回用技术的研究进展

化学机械研磨废水产生量大但总体污染物浓度不高,回用潜力巨大,其处理及回用技术是芯片制造企业的研究重点。文章介绍了化学机械研磨废水来源、水质特征,概述并对比分析了常用的化学机械研磨废水处理和回用技术及其应用现状和发展趋势,并指出以膜滤或电化学处理为主的处理及回用技术具有良好的运用前景。     

仿生超疏水金属表面应用研究进展

叙述了浸润性理论基础,较全面地介绍了超疏水金属表面在许多基础研究和工业应用领域所具有的重要理论意义和广阔的应用前景,包括自清洁、流体减阻、水上微型运输器、抗凝露、防冰覆、腐蚀与防护、液体传输、油水分离、生物污损及防除、海洋污损及防除等,并且提出超疏水金属表面的耐蚀机理,为拓展仿生超疏水金属材料在工业领域及民用部门的工程应用背景提供可以借鉴的依据。