再生双胶纸品质的提升措施

再生双胶纸因低能耗、轻污染,市场占有率和认可度逐步提升。但其存在强度低、尘埃度高、印刷适性差等方面的不足,需要从设备、工艺等各方面进行解决,逐步提升再生双胶纸的品质。     

影响纸张透明度的几种因素

简单介绍了透明纸和半透明纸的应用现状和纸张透明机理,从浆料、填料、造纸助剂以及其他少量成分、浸渍物、造纸工艺几方面探讨了影响纸张透明度的因素。     

Application of transparent casting moulds prepared by additive manufacturing technology in hydraulic simulation

Hydraulic simulation is one of the critical methods to research the filling mechanism of molten metal in the casting process. However, it only performs on test pieces with relatively simple structures due to the limitation of the preparation method. In this study, the method of photocuring additive manufacturing was used to prepare the complex casting mould from transparent photosensitive resin. The pouring test was carried out under different centrifugal conditions, and the filling process of the gating system, support bars and other positions in the vertical direction was recorded and analyzed. The experimental results show that the internal liquid level and the filling process of the test piece prepared by this method can be observed clearly. The angle between the liquid surface and the horizontal plane in the test piece gradually increases as the centrifugal rotational speed increases, which means the filling process is carried out from outside to inside at high rotational speed. The velocity of the fluid entering the runner increases with the increase of rotational speed, but the filling speeds is less affected by the centrifugal speed at other positions. The liquid flow is continuous and stable during the forward filling process, without splashing or interruption of liquid droplets.

     

原位聚合沉积透明导电聚苯胺薄膜的研究进展

苯胺在化学氧化聚合过程中,可自发地聚合沉积在不同基体表面,形成透明导电聚苯胺薄膜。重点介绍近年来国内外在玻璃、聚合物、纤维织物和二氧化硅基体表面原位聚合沉积透明导电聚苯胺薄膜的研究进展,并探讨了反应机理。展望了透明导电聚苯胺薄膜在光电器件和微电子器件领域的应用前景。     

Assessment of conversion efficiency of Cr4+ ions by aliovalent cation additives in Cr:YAG ceramic for edge cladding

0.25at.% Cr:YAG ceramics were successfully fabricated as the edge cladding of Yb:YAG transparent ceramic slabs through vacuum sintering of co‐precipitated powders, using oxide additives to introduce different cations. The effects of various cation additives (Si⁴⁺, Ca²⁺, and Si⁴⁺ + Ca²⁺) on the conversion efficiency of Cr⁴⁺ ions and optical characteristics of the Cr:YAG edge cladding were investigated. Measurements of the absorption spectra of the Cr:YAG ceramics without any additives revealed 2 absorption bands centered at 430 nm and 600 nm, which imparted the sample with a green color. The introduction of only Si⁴⁺‐bearing additive did not promote the transition of Cr ions from the 3+ to 4+ state. Theoretical analysis and experimentation revealed that the addition of CaO not only enhanced the microstructure and improved the transmittance of the Cr:YAG ceramic, but also introduced vacancies that assisted in the formation of Cr⁴⁺ ions. It was determined that CaO has the same effect on the conversion efficiency of Cr⁴⁺ ions whether it is added as a single additive or in combination with SiO₂. The underlying mechanisms by which these aliovalent cation additives influence the formation of Cr⁴⁺ ions and affect optical properties are discussed in detail. High quality composite ceramics with Yb:YAG transparent ceramic slabs and dark brown‐colored Cr⁴⁺: YAG ceramic edge cladding were achieved through the addition of 0.05 wt.% CaO to the edge cladding, with no interfacial effects between the 2 regions being observed.     

汽车铝轮毂用电镀效果粉末涂料的应用研究

介绍了电镀银特效粉末涂料在铝轮毂上的应用,分析了配方中羧基聚酯树脂、环氧树脂、流平剂、银粉特效排列助剂等对涂层性能的影响,通过表面罩丙烯酸透明粉对轮毂进行力学性能检测和涂膜性能测试,并解决相应的问题,进一步探讨底面合一电镀效果粉末涂料代替汽车银漆在施工上的可能性。     

透明聚氨酯材料的研究进展及其应用

透明聚氨酯材料由于具有良好的光学性能、耐热性、耐磨性和机械性能可调控性,引起了科研工作者的极大兴趣。文章就国内外关于透明聚氨酯材料的合成过程及应用进行分类总结,分析了透明聚氨酯材料合成方法,指出各种合成方法的优缺点,并提出了透明聚氨酯材料发展的方向。     

直流磁控溅射法在PET基板上制备AZO薄膜

室温下用直流磁控溅射法在PET塑料基板上制备氧化锌薄膜及掺铝氧化锌AZO(ZnO∶Al)薄膜.通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、四点探针仪、霍尔效应仪及光谱仪等装置,考察了氧分率、溅射功率及铝掺杂量等工艺参数对薄膜微观结构和光电性能的影响.结果表明:AZO薄膜晶体结构为纯ZnO的六角纤锌矿结构.随着Al掺杂量增多,AZO薄膜导电性增加,透光率下降.在氧分率为8.2％,ZnO(40 nm)/Al(6 nm)三层膜条件下,得到电阻率为5.66×10-2Ω·cm,可见光范围内透光率约为80％的AZO薄膜.     

Pulse broadening factor as a criterion to assess nonlinear penalty of 40-Gbit/s RZ-DQPSK signals in dynamic transparent optical networks

The real-time scheduling and routing in dynamic transparent optical networks requires fast and accurate evaluation of transmission penalty caused by nonlinear kerr effects with different dispersion maps. However, the conventional method using nonlinear phase shift can only be applied to assess the nonlinear penalty with optimized dispersion maps. In this paper, we introduce pulse broadening factor into the approach and propose a novel method to accurately evaluate nonlinear penalty and numerically investigate the feasibility of our novel method in 40-Gb/s Return-to-Zero Differential Quadrature Phase-Shift Keying (RZ-DQPSK) systems. Simulation results show that our approach can achieve good evaluation performance even with non-optimized dispersion maps.     

Electronic Granularity and the Work Function of Transparent Conducting ZnO:Al Thin Films

Controlling the efficiency of electron transport across oxide interfaces is essential for numerous emerging technologies including advanced photovoltaics and light emitting devices. This work illuminates the connections between granular structure, defect chemistry, and the work function of a technologically important transparent conductor, ZnO:Al. Visual evidence is provided for a model of grain boundary oxidation in the form of nanometer‐scale heterogeneity in the contact potential between grains and grain boundaries, a phenomenon referred to as electronic granularity. By correlating scanning probe data with photoemission spectroscopy we relate electronic granularity to defect chemistry and, importantly, account for the overall trends in work function. The resulting physical picture connects heterogeneity at the nanoscale to macroscopic properties, informs the design of transparent electrodes, and may be broadly relevant to granular oxide conductors.