SiO2为壳层材料的纳米复合材料的研究进展

SiO2具有许多特性，用其作壳层材料来制备核-壳结构的纳米复合材料可以使其具有更多的特殊性质。本文综述了SiO2包裹磁性纳米粒子、量子点以及贵金属纳米粒子的研究进展。     

A novel fabrication of meso-porous silica film by sol-gol of TEOS

A homogeneous crack-free nano- or meso-porous silica films on silicon was fabricated by colloidal silica sol derived by hydrolyzing tetraethyl orthosilicate (TEOS) catalyzing with (C4H9)4N OH- in water medium. The solution with ratio of H2O/TEOS≥15, R4N and glycerol as templates, combining with the hydrolyzed intermediate, controlled the silica aggregating; the templated silica film with heterostructure was developed into homogeneous nano-porous then meso-porous silica films after being annealed from 750 ℃ to 850 ℃; the formation mechanism of the porous silica films was discussed; morphologies of the silica films were characterized. The refractive indexes of the porous silica films were 1.256-1.458, the thermal conductivity < 0.7 W/m/K. The fabricating procedure and the sequence had not been reported before.     

湿法刻蚀熔石英斜坡陡度的研究

用浸没的湿法刻蚀方法，以熔石英为基板刻蚀材料，用优化配方的HF刻蚀液进行刻蚀．研究了HF刻蚀一维光栅台阶的斜坡陡度．分析了台阶斜坡陡度的理论值，并给出了其实验结果值，最后分析了影响刻蚀斜坡陡度的一些因素．     

Durable superamphiphobic silica aerogel surfaces for the culture of 3D cellular spheroids

The 3D multicellular spheroids with intact cell–cell junctions have major roles in biological research by virtue of their unique advantage of mimicking the cellular physiological environments. In this work, a durable superamphiphobic silica aerogel surface (SSAS) has been fabricated for the upward culture of 3D multicellular spheroids. Poly(3,4-ethylenedioxythiophene) (PEDOT) was first electrodeposited on a conductive steel mesh as a first template for porous silica coating. Soot particles were then applied as a second template to construct a cauliflower-like silica aerogel nanostructure. After fluorination, a hierarchical structure with re-entrant curvature was finally fabricated as a durable superamphiphobic surface. This superamphiphobic surface also presented excellent antifouling towards biomacromolecules and cells, which has been demonstrated by the successful upward culture of cell spheroids. The upward culture makes the observation of cellular behavior in situ possible, holding great potential for 3D cellular evaluation in vitro.     

Novel Electro-Optical Modulator Utilizing GeO2-Doped Silica Waveguide

In order to achieve a modulator with broad bandwidth and perfect impedance match,a novel electro-optical modulator based on GeO2-doped silica waveguides on silicon substrate is designed.The finite element model of the whole electro-optical modulator is established by means of ANSYS.With the finite element method analysis,the performance of the novel modulator is predicted.The simulation reveals that the designed modulator operates with a product of 3 dB optical bandwidth and modulating length of 226.59 GHz-cm,and a characteristic impedance of 51.6 Ω at 1 550 nm wavelength.Moreover,the calculated electrical reflected power of coplanar waveguide electrode is below -20 dB in the frequency ranging from 45 MHz to 65 GHz.Therefore,the designed modulator has wide modulation bandwidth and perfect impedance match.     

Novel electro-optical modulator utilizing GeO2-doped silica waveguide

In order to achieve a modulator with broad bandwidth and perfect impedance match, a novel electro-optical modulator based on GeO₂-doped silica waveguides on silicon substrate is designed. The finite element model of the whole electro-optical modulator is established by means of ANSYS. With the finite element method analysis, the performance of the novel modulator is predicted. The simulation reveals that the designed modulator operates with a product of 3 dB optical bandwidth and modulating length of 226.59 GHz·cm, and a characteristic impedance of 51.6 Ω at 1 550 nm wavelength. Moreover, the calculated electrical reflected power of coplanar waveguide electrode is below −20 dB in the frequency ranging from 45 MHz to 65 GHz. Therefore, the designed modulator has wide modulation bandwidth and perfect impedance match. Supported by National Natural Science Foundation of China (No.60577023)and Key Laboratory of Opto-Electronics Information and Technical Science of Ministry of Education, China. LI Jiusheng, born in 1976, male, Dr.     

人血凝块DNA三种提取方法的比较

采用高盐法、硅珠法、改进的经典酚抽提法三种方法提取人血凝块DNA,通过紫外分光光度仪及琼脂糖凝胶电泳测定DNA的纯度和含量.实验结果表明,硅珠法提取时间快,所提取的DNA含量高;经典酚抽提法操作过程简单,但用有机溶剂提取,污染比较严重;高盐法提取要用大量的血凝块,且提取的DNA含量很不稳定.因此,硅珠法是提取人血凝块DNA的一种比较好的方法.     

Production of accurate skeletal models of domestic animals using three‐dimensional scanning and printing technology

Access to adequate anatomical specimens can be an important aspect in learning the anatomy of domestic animals. In this study, the authors utilized a structured light scanner and fused deposition modeling (FDM) printer to produce highly accurate animal skeletal models. First, various components of the bovine skeleton, including the femur, the fifth rib, and the sixth cervical (C6) vertebra were used to produce digital models. These were then used to produce 1:1 scale physical models with the FDM printer. The anatomical features of the digital models and three‐dimensional (3D) printed models were then compared with those of the original skeletal specimens. The results of this study demonstrated that both digital and physical scale models of animal skeletal components could be rapidly produced using 3D printing technology. In terms of accuracy between models and original specimens, the standard deviations of the femur and the fifth rib measurements were 0.0351 and 0.0572, respectively. All of the features except the nutrient foramina on the original bone specimens could be identified in the digital and 3D printed models. Moreover, the 3D printed models could serve as a viable alternative to original bone specimens when used in anatomy education, as determined from student surveys. This study demonstrated an important example of reproducing bone models to be used in anatomy education and veterinary clinical training. Anat Sci Educ 11: 73–80. © 2017 American Association of Anatomists.     

精密铸造硅溶胶粘结剂型壳发泡涂料的研究

在精密铸造涂料中加入发泡剂及稳泡剂,研究各种发泡剂和稳泡剂对发泡效果的影响,寻找最佳的发泡剂和稳泡剂.由发泡涂料制成多孔性型壳在保证其湿强度、高温强度及铸件质量的前提下,可降低残留强度,改善型壳的溃散性,是国内一项新工艺.     

晶体熔解实验失败的根本原因和改进方法

本文通过对理想的晶体熔解曲线的分析得出,晶体熔解实验失败的根本原因是:系统的熔解过程严重偏离了准静态过程;系统从外界吸取的热流量不稳定.要得到比较理想的实验结果,一方面,要使系统的弛予时间尽可能的短,另一方面是热源提供给系统的热流量应是一个恰当的恒量.据此,提出了一种改进方案.