Colloidal lithography and current fabrication techniques producing in-plane nanotopography for biological applications

Substrate topography plays a vital role in cell and tissue structure and function in situ, where nanometric features, for example, the detail on single collagen fibrils, influence cell behaviour and resultant tissue formation. In vitro investigations demonstrate that nanotopography can be used to control cell reactions to a material surface, indicating its potential application in tissue engineering and implant fabrication. Developments in the catalyst, optical, medical and electronics industries have resulted in the production of nanopatterned surfaces using a variety of methods. The general protocols for nanomanufacturing require high resolution and low cost for fabricating devices. With respect to biological investigations, nanotopographies should occur across a large surface area (ensuring repeatability of experiments and patterning of implant surfaces), be reproducible (allowing for consistency in experiments), and preferably, accessible (limiting the requirement for specialist equipment). Colloidal lithography techniques fit these criteria, where nanoparticles can be utilized in combination with a functionalized substrate to produce in-plane nanotopographies. Subsequent lithographic processing of colloidal substrates utilizing, for example, reactive ion etching allows the production of modified colloidal-derived nanotopographies. In addition to two-dimensional in-plane nanofabrication, functionalized structures can be dip coated in colloidal sols, imparting nanotopographical cues to cells within a three-dimensional environment.     

固体酒精的制备工艺与性能研究

为了确定固体酒精的制备工艺对制品性能的影响，利用正交试验对固体酒精的制备工艺与制品性能进行了研究.结果表明，以硬脂酸与氢氧化钠反应生成硬脂酸钠作为固化剂的制备固体酒精的优化条件为：硬脂酸2 g，氢氧化钠0.4 g，反应时间30 min，反应温度70 ℃，一次酒精用量40 ml，二次酒精用量50 ml；固体酒精的制备工艺条件与制品的性能有一定关系：影响制品的燃烧残渣量和燃烧时间的主要因素是硬脂酸用量，其次是反应时间和氢氧化钠用量；硬脂酸用量和反应温度对热值稍有影响；硬脂酸和氢氧化钠用量比影响凝固性能.     

塑料模具激光精密修复技术的研究

脉冲Nd:YAG激光熔覆技术是精密修复塑料模具最有效的方法之一，激光器的电压、电流、脉冲宽度、脉冲频率与激光的扫描速度、光斑直径等工艺参数直接影响着熔覆的质量。为了综合考虑各工艺参数的影响和简化工艺调整过程，提出了重叠率的观念，建立了重叠率的计算方程。分别采用预置熔覆法和手动送丝法在低碳钢基体上熔覆Ni基合金，获得了最佳工艺参数：单脉冲能量为6.7 J，重叠率为97.4%。利用扫描电子显微镜观察了手动送丝熔覆层存在的冶金缺陷，对其产生的原因进行了初步探讨。     

石墨烯的制备及其在能源方面的应用研究进展

近年来,石墨烯以其独特的二维结构和许多优异的性能吸引了物理、化学、材料等领域科学家的关注,并得到了多方面研究。至今,石墨烯的制备方法有多种,其研究取得了一定的进展,为石墨烯的理论研究和实践应用奠定了基础。本文综述了石墨烯的制备方法(固相法、液相法和气相法)及其在能源方面的应用研究现状,并比较了各种方法的优缺点。最后,对石墨烯的未来发展作了展望。     

Design and Fabrication of Faceted Mirror Arrays for Light Field Capture

The high resolution of digital cameras has made single‐shot, single‐sensor acquisition of light fields feasible, though considerable design effort is still necessary in order to construct the necessary collection of optical elements for particular acquisition scenarios. This paper explores a pipeline for designing, fabricating and utilizing faceted mirror arrays which simplifies this task. The foundation of the pipeline is an interactive tool that automatically optimizes for mirror designs while exposing to the user a set of intuitive parameters for light field quality and manufacturing constraints. We investigate two manufacturing processes for automatic fabrication of the resulting designs: one is based on CNC milling, polishing, and plating of one solid work piece, while the other involves assembly of CNC‐cut mirror facets. We demonstrate results for refocusing in a macro photography scenario. In addition, we observe that traditional photographic parameters take novel roles in the faceted mirror array setup and discuss their influence.     

CO_2激光器加工晶圆切缝控制工艺研究

晶体硅是当前最重要的半导体材料,主要用于微电子技术。随着微电子技术的发展,对晶圆的切割技术要求越来越高,而在实际切割中,对晶圆的切割十分注重于晶圆的切割宽度,以降低晶圆损耗。研究CO2激光切割机的脉宽、频率以及切割速度对晶圆切割宽度的影响,从而达到高效率、小宽度、高标准的激光切割加工。     

陕西科技信息大厦钢管混凝土施工

介绍陕西科技信息大厦钢管混凝土柱结构特点、施工工艺和质量要求，包括钢管柱制作、安装、底座埋设、补偿收缩混凝土施工、坍落度调整、高位抛落并振捣的方法及钢管混凝土柱质量检查方法。     

High-speed fabrication of 3-dimensional colloidal photonic crystal films by slide coating of polymer microspheres with continuous feeding of colloidal suspension

A simple, yet rapid fabrication method for large area colloidal crystal film is demonstrated. Aqueous colloidal dispersion sandwiched between a hydrophobic top cell and a hydrophilic bottom substrate formed a flat meniscus at the drying front, from which high quality colloidal crystal films were obtained within 20 min due to the strong capillary force exerted by accelerated water evaporation aided by hot air blowing. Continuous supply of the suspension enabled the fabrication of the colloidal crystal over large area (> 4 cm²) without significant loss of colloids.     

Organic LED full-color passive-matrix display

Abstract— A full-color 5.2-inch 1/4-VGA passive-matrix organic LED display has been developed, adopting selective deposition for the different emitting materials. The display features 320 (×3) × 240 pixels with an equivalent pixel size of 0.33 × 0.33 mm, white peak luminance of over 150 cd/m², and power consumption of 6 W.