Luminescence properties of the Langmuir-Blodgett film of terbium(III) stearoylanthranilate

Terbium(III) stearoylanthranilate has been prepared as a high property Z-type Langmuir-Blodgett (LB) film on various substrates by a vertical transfer process. The UV-visible absorption spectra and the low angle X-ray diffraction peaks have been collected in order to investigate the molecular arrangement and aggregation in the LB films. The average molecular orientation in multilayer stacking was determined by Attenuated Total Reflection Spectroscopy. The influence of the chemical environment of terbium within the LB films on the luminescence properties has been discussed.     

Bio-based polyurethane films using white dextrins

Several new eco-friendly materials have the potential to replace conventional petroleum-derived materials and monomers. Among them are natural polysaccharides. The use of polysaccharides in polyurethane (PU) synthesis has not yet been studied extensively, even though as multihydroxyl compounds, they can easily serve as crosslinkers in PU synthesis. One naturally occurring (hyper-)branched polymer is amylopectin, a component of starch. In this work, we report the PU synthesis and film-forming capacity using the asymmetric cyclic aliphatic diisocyanate—isophorone diisocyanate (IPDI) with acetylated and pristine partially hydrolyzed amylopectin/white dextrin (AVEDEX W80) as a crosslinker. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47454.     

A New Extension of Cauchy–Born Rule for Monolayer Crystal Films

By combining with the physical concept of inscribed surface, the standard Cauchy–Born rule (CBR) is straightly extended to have a rigorous and accurate atomistic continuum theory for the monolayer crystal films. Resorting to using Tersoff–Brenner potential, the present theory to graphite sheet and single-walled carbon nanotubes (SWCNTs) is applied to evaluate the mechanical properties. The results are validated by the comparison with previously reported studies.     

光亮酸性镀铜的设备配置

电镀设备设施的完善和改进,往往能比单纯从对工艺镀液的调整、处理获得更好的效果。硫酸盐光亮酸性镀铜,由于工艺的某些特殊性,对此要求更高。本文结合不同体系光亮剂的工艺特点,进行了较为详细的讨论。连续过滤、镀液搅拌、液温过低时的恒温电加热、采用低纹波直流电源,是共同需要的;当液温超过工艺上限时,应根据多种因素来选择不同的降温措施。即使对宣称可不除膜的工艺,在工艺布局设计时,也宜设简单的化学除膜工序,以备不时之需。     

Fabrication of thick gel-like films by anodizing iron in a novel electrolyte based on dimethyl sulfoxide and H2SiF6

The thick bi-layered gel-like film has been grown by anodizing iron in a novel electrolyte composition based on dimethyl sulfoxide and silica hexafluoride acid (H₂SiF₆) and examined. The thickness of the anodic film composed of the inner orange-colored nanoporous layer and the outer cherry-colored gel-like layer increased at a constant rate up to 40–50 μm depending on the bath composition and anodizing conditions. Under drying and subsequently annealing, the gel layer shrinks and cracks producing hierarchical morphology of thick films mainly composed of hematite (a-Fe₂O₃). Scanning electron microscopy, Mössbauer, Raman and energy dispersive X-ray spectroscopies, and X-ray diffraction have been applied to reveal the composition and morphology of these novel films before and following various post-treatments.     

有机/无机复合透明耐磨薄膜的制备

以甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)水解聚合产物作为主要成膜物质,引入正硅酸乙酯(TEO S)水解产物硅溶胶作为无机增强物,调节两种混合溶液pH值,利用两者羟基之间的共缩聚反应在聚碳酸酯(PC)板表面制备有机/无机复合透明耐磨薄膜;采用TG/DTA、FT-IR、SEM及UV-V IS对成膜过程、薄膜性能与结构进行表征。结果表明,KH-570和TEO S水解聚合产物通过共缩聚反应在PC板表面形成带有有机基团的无机交联网络,基本骨架由S i-O-S i组成,经120℃热处理后,薄膜均匀致密,提高了PC板的耐磨性,并有一定的增透作用。     

一种新型楔形膜在真空中的制作方法及测试结果

提出了一种新型楔形膜在真空中的制作方法,可以替代白光干涉位移传感器中的关键元件.该方法采用两层复制技术,用有机材料SU8胶作为楔形膜中间的材料.同时,搭建了白光干涉位移传感器系统,对制作的楔形膜进行了测量.实验结果表明,该解调系统具有较好的稳定性及较高的测量精度.     

非晶氮化硼薄膜的场致电子发射研究

利用脉冲激光沉积 (PLD)技术在镀钛的陶瓷衬底上制备出了非晶态氮化硼薄膜 ,借助于X射线衍射(XRD)、扫描电子显微镜 (SEM )及Raman光谱分析了该薄膜的结构 ,并研究了薄膜场致电子发射特性 ,阈值电场为4 6V μm ,当电场为 9V μm时 ,电流密度为 5 0 μA cm2 。