贵金属纳米颗粒及其催化剂的生物还原制备技术

利用自行筛选的具有强还原能力的菌株制备得到银纳米颗粒,所得颗粒的粒径基本在10 nm以下,主要集中在2~8nm。将生物还原过程进一步引入催化剂制备过程,得到负载型银催化剂和负载型钯催化剂,并将催化剂分别应用于1,2-丙二醇空气氧化合成丙酮醛、CO氧化生产CO2以及蒽醌加氢反应中

利用约束刻蚀剂层技术提高硅的刻蚀分辨率(英文)

高分辨率刻蚀技术对于微机械及微电子器件的加工具有十分重要的意义，而硅是其中极为重要并占统制地位的材料。近年来，扫描电化学显微镜（ＳＥＣＭ）用于表面加工的研究颇受注目。然而，ＳＥＣＭ刻蚀分辨率往往因为刻蚀剂的横向扩散而受到限制。最近，田昭武等提出的一种可进行高分辨率微加工的新方法——约束刻蚀剂层技术（ＣＥＬＴ），可使刻蚀反应具有高度的距离敏感性，刻蚀分辨率得到极大改善。我们利用ＣＥＬＴ技术刻蚀硅表面，以６０μｍ及１００μｍ直径微电极产生刻蚀剂Ｂｒ２，刻蚀溶液中加入亚砷酸作为Ｂｒ２的捕捉剂刻蚀得到的图案与所用微电极尺寸符合，直径分别约为６０μｍ和１００μｍ。与ＳＥＣＭ方法得到的１１０μｍ和１８０μｍ分辨率相比，刻蚀分辨率得到大幅度提高。作者联系地址：厦门大学化学系,哈尔滨工业大

Concentration Protile of Etchant Measured by Microelectrode Technique in the Process of Chemical Micromachining

利用微圆盘电极技术,测定了KBr、L-胱氨酸和硫酸组成的刻蚀溶液体系中Pt电极表面电化学氧化产生的刻蚀剂Br2浓度分布,为约束刻蚀剂层技术(CELT)中刻蚀体系的选择和优化提供更直观的依据.GaAs表面CELT微加工实验证明了用微圆盘电极测得的表面刻蚀剂的浓度分布趋势与微加工实验所得到的结果一致.A carbon-disk microelectrode was used to investigate the surface concentration profile of etchant Br2, which was electrogenerated on the Pt working electrode. The steady state reducing currents of Br2 at different distances away from the Pt electode was measured. The concentration profile was estimated from the current-distance variation curves as a function of different sampling times. Experimentally determined concentration profiles are in good agreement with those estimated from the microetching results. The microelectrode technique has offered a good method to choose suitable etching solution for chemical micromachining.国家高新技术发展规划(863项目)(2002AA404170);; 福建省自然科学基金计划资助项目(E0520001

金属Cu表面三维齿状微图形的复制加工——约束刻蚀剂层技术 (CELT)的应用

主要介绍了一种Cu的CELT加工的化学刻蚀体系和捕捉体系 ,并通过控制刻蚀时间、刻蚀电流、刻蚀剂浓度、捕捉剂浓度等实验参数和优化电化学模板的制作工艺 ,以规整的齿状结构为模板 ,在Cu的表面实现了三维微结构的复制加工 ,得到了与齿状结构模板互补的三维微结构 ,用SEM和AFM对实验结果进行了表征 ,表征结果证明约束刻蚀剂层技术在金属三维加工方面的可行性和潜在优势。金属Cu由于具有优良的导热导电性能以及很好的延展性 ,在微系统 (也称微机电系统 )中应用广泛 ,因此对Cu的刻蚀加工对微系统技术的发展具有重要的意义。约束刻蚀剂层技术 (ConfinedEtch antLayerTechnique简称CELT)作为一种新型的微加工技术[1] ,能够加工复制出复杂三维结构 ,到目前为止 ,该技术已成功应用于Si、GaAs等材料微结构的复制加工[2 ,3]

Concentration protile of etchant measured by microelectrode technique in the process of chemical micromachining

A carbon-disk microelectrode was used to investigate the surface concentration profile of etchant Br-2, which was electrogenerated on the Pt working electrode. The steady state reducing currents of Br-2 at different distances away from the Pt electode was measured. The concentration profile was estimated from the current-distance variation curves as a function of different sampling times. Experimentally determined concentration profiles are in good agreement with those estimated from the microetching results. The microelectrode technique has offered a good method to choose suitable etching solution for chemical micromachining

The NMR experiment based on Labview

介绍了虚拟仪器的基本原理,设计了两种在Labview的支持下进行核磁共振教学实验的虚拟仪器,一种用于实际实验,另一种可用于仿真实验,支持网络远程实验功能。In this paper,the essential principles of the virtual instrument are introduced,and two kinds of the virtual instrument which are used in the NMR experiment are designed.One is used in real experiment, and the other is used in emulation experiment,both can be operated through IE browser.福建省自然科学基金项目(A0310003);; 福建省高等学校第二批网络课程计划(14

Distribution Solar Energy Collection And Central Storage Based On Phase Change Material

Solar energy is a clean and inexhaustible energy. But it is an intermittent energy due to the weather and season. So the efficient use of solar energy is a very important research topic. In this paper we describe a system where the solar collecting system is a distribution system with a central storage part realized by pipeline transportation. For solar collecting system, the distribution structure used can solve the problem of heat collector with oversize for the floor space. It is well known that heat storage is an important part in solar collecting system. In the center heat storage part and heat storage materials are always water and gravel-water etc. , which use sensible heat to store thermal energy. But the sensible heat is limited due to its lack of capacity. Phase change material is a type of thermal energy storage material which has higher heat storage capability than that of sensible heat storage material. Therefore, phase change materials are used for thermal energy storage in the bad weather and related cases.Solar energy is a clean and inexhaustible energy. But it is an intermittent energy due to the weather and season. So the efficient use of solar energy is a very important research topic. In this paper we describe a system where the solar collecting system is a distribution system with a central storage part realized by pipeline transportation. For solar collecting system, the distribution structure used can solve the problem of heat collector with oversize for the floor space. It is well known that heat storage is an important part in solar collecting system. In the center heat storage part and heat storage materials are always water and gravel-water etc. , which use sensible heat to store thermal energy. But the sensible heat is limited due to its lack of capacity. Phase change material is a type of thermal energy storage material which has higher heat storage capability than that of sensible heat storage material. Therefore, phase change materials are used for thermal energy storage in the bad weather and related cases