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单晶铜 1

原子力显微镜 1

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Self-assembly of metal-cholesterol oxidase hybrid nanostructures and application in bioconversion of

Yu Xin, Qiuyue Gao, Yu Gu, Mengyao Hao, Guangming Fan, Liang Zhang

《化学科学与工程前沿（英文）》 2021年第15卷第3期页码 615-629 doi: 10.1007/s11705-020-1989-7

摘要： A cholesterol oxidase (COD) was hybridized with Ca , Zn , Al , Fe and Mn . After precipitation with PO at 4 °C for 72 h, the resulting pellets were freeze-dried. In scanning electron microscopy assays, the metal-COD complexes revealed flower-like or granular structures after hybridization. Fourier transform infrared spectroscopy assay revealed the characteristic peaks of both the enzyme and metal materials. X-ray diffraction analysis indicated that COD was encapsulated in CaHPO ·2H O-, Zn (PO ) ·4H O-, AlPO -, FeP - and Mn (PO ) ·3H O-based nanostructures, respectively. Differential scanning calorimetry assay indicated significant increases in thermo-denaturation temperatures from 60.5 °C to 167.02 °C, 167.02 °C, 137.70 °C, 172.85 °C and 160.99 °C, respectively. Using steroid derivatives as substrates, this enzyme could convert cholesterol, pregnenolone, dehydroepiandrosterone, ergosterol, -sitosterol and stigmasterol to related single products. Hybridization in metal-based nanostructures could significantly enhance the initial conversion ratio and reaction stability of the enzyme. In addition, substrate selectivity could be affected by various metal materials. Briefly, using Ca , Zn , Al , Fe and Mn as hybrid raw materials could help to encapsulate COD in related metal-enzyme nanostructures, and could help to promote the stability and tolerant properties of the enzyme, while also enhancing its catalytic characteristics.

关键词： cholesterol oxidase metal-enzyme hybridization nanostructures sterol derivatives bioconversion

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Spectral emittance measurements of micro/nanostructures in energy conversion: a review

Shiquan SHAN, Chuyang CHEN, Peter G. LOUTZENHISER, Devesh RANJAN, Zhijun ZHOU, Zhuomin M. ZHANG

《能源前沿（英文）》 2020年第14卷第3期页码 482-509 doi: 10.1007/s11708-020-0693-0

摘要： Micro/nanostructures play a key role in tuning the radiative properties of materials and have been applied to high-temperature energy conversion systems for improved performance. Among the various radiative properties, spectral emittance is of integral importance for the design and analysis of materials that function as radiative absorbers or emitters. This paper presents an overview of the spectral emittance measurement techniques using both the direct and indirect methods. Besides, several micro/nanostructures are also introduced, and a special emphasis is placed on the emissometers developed for characterizing engineered micro/nanostructures in high-temperature applications (e.g., solar energy conversion and thermophotovoltaic devices). In addition, both experimental facilities and measured results for different materials are summarized. Furthermore, future prospects in developing instrumentation and micro/nanostructured surfaces for practical applications are also outlined. This paper provides a comprehensive source of information for the application of micro/nanostructures in high-temperature energy conversion engineering.

关键词： concentrating solar power (CSP) emittance measurements high temperature micro/nanostructure selective absorber selective emitter thermophotovoltaics (TPV)

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Applications of hollow nanomaterials in environmental remediation and monitoring: A review

Yuankai ZHANG,Zhijiang HE,Hongchen WANG,Lu QI,Guohua LIU,Xiaojun ZHANG

《环境科学与工程前沿（英文）》 2015年第9卷第5期页码 770-783 doi: 10.1007/s11783-015-0811-0

摘要： Hollow nanomaterials have attracted significant attention because of their high chemical and thermal stability, high specific surface area, high porosity, low density, and good biocompatibility. These state-of-the-art nanomaterials have been shown to efficiently adsorb heavy metals, and volatile hazardous substances, photodegrade persistent organic pollutants, and other compounds, and inactivate bacteria. Such properties have enabled the use of these materials for environmental remediation, such as in water/wastewater treatment, soil remediation, air purification, and substance monitoring, etc. Hollow nanomaterials showed higher photocatalytic activity than those without hollow structure owing to their high active surface area, reduced diffusion resistance, and improved accessibility. And, the Doping method could improve the photocatalytic performance of hollow nanomaterials further under visible light. Moreover, the synthetic mechanisms and methods of these materials are important because their size and morphology help to determine their precise properties. This article reviews the environmental applications and potential risks of these materials, in addition to their syntheses. Finally, an outlook into the development of these materials is provided.

关键词： hollow nanomaterials environmental remediation nanotechnology nanostructures morphology

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基于AFM探针的纳米加工技术制备周期性纳米结构——沟槽和材料堆积形貌相结合 Article

耿延泉, 闫永达, 王继强, Emmanuel Brousseau, 孙彦文, 孙雅洲

《工程（英文）》 2018年第4卷第6期页码 787-795 doi: 10.1016/j.eng.2018.09.010

摘要：

本文提出了一种基于原子力显微镜（AFM）探针的加工技术制备周期性纳米结构的方法，该方法通过将加工得到的沟槽形貌和沟槽边缘的材料堆积形貌相结合得到周期性纳米结构。研究发现控制相邻沟槽的间距是保证周期性纳米结构质量的重要因素。实验结果表明，当相邻刻划轨迹间的进给量值等于单个沟槽两侧材料堆积峰值间的宽度时，可以通过本方法加工得到较高质量的周期性结构。加工得到的纳米结构周期性可以通过一维和二维快速傅里叶变换（FFT）算法进行评价。在检测得到周期结构的AFM 图像中，取其截面进行FFT并将幅频特性曲线归一化，在幅频特性曲线中用峰值部分面积与总体面积的比值来定量分析纳米结构的周期性。最后，对加工得到的周期性纳米结构产生的颜色化效应进行了研究，证明了其在防伪以及金属传感等领域有潜在的应用价值。

关键词：原子力显微镜纳米加工周期性纳米结构单晶铜