Mesoporous silica nanospheres with the ability of photo-driven releasing sandela 803 for the application to wallpaper

Mesoporous silica nanospheres loaded with sandela 803 (S803@MS-S) are prepared for application to wallpaper. The nano-fragrance has high encapsulation efficiency and property of photo-driven release.     

酞菁铜与Q-CdS超微粒子界面的光致电荷转移研究

半导体超微粒子与有机分子界面的光致电行转移过程是当前光化学和材料科学研究的一个活跃领域［‘，2］；研究的目的主要有两个方面，一是研究半导体超微粒子表面光致电行转移的特性；二是研究有机分子对超微粒子的光敏化作用．目前，超微粒子的功能化研究日益深入，其独特的光     

Silicon Carbide Supported Palladium‐Iridium Bimetallic Catalysts for Efficient Selective Hydrogenation of Cinnamaldehyde

Selective hydrogenation of α,β‐unsaturated carbonyls into saturated carbonyls is important to obtain remunerative products. However, it is still a challenge to achieve high activity and selectivity under mild conditions. Herein, Pd, Ir and bimetallic Pd‐Ir nanoparticles were uniformly deposited with high dispersity on the surface of SiC by a facile impregnation method, respectively. The as‐prepared Pd/SiC catalysts efficiently hydrogenate cinnamaldehyde to hydrocinnamaldehyde at room temperature and atmospheric pressure, and the activity of Pd/SiC is observed further enhanced by adding Ir component (conversion of 100%). In addition, the dependence of Pd‐Ir catalyst activity on Pd/Ir molar ratio confirms a synergistic effect between Ir and Pd, which originates from the electron transfer between Pd and Ir.     

Zwitterionic comb-like lipid polymers encapsulating linalool for increasing the fragrance retention time

Fragrances are widely used in cosmetics,apparel and detergents.However,the rapid evaporation of the aro ma shortens the useful life of the aromatic product.Therefore,improving the fragrance retention time of aromatic products and prolonging the service life of aromatic products are the key scientific problems that need to be solved in current aromatic products.In this study,zwitterionic comb-like lipid polymers were synthesized to encapsulate the fragrance molecule linalool.The results showed that the zwitterionic comb lipid molecules were capable of encapsulating more linalool than linear lipid molecules.At the same time,the zwitterionic comb-like lipid molecules also limited the slow release rate of the aroma,thereby increasing the fragrance retention time of the nano-fragrance.     

Cationic and temperature-sensitive liposomes loaded with eugenol for the application to silk

Silk has been widely used in the clothing industry due to their soft and smooth features, good biocompatibility, good heat dissipation, warmth and ultraviolet resistance. The application of fragrance to silk can significantly improve the performance of silk. However, there are two key scientific problems that need to be solved: slowing down the release rate of fragrances and increasing the scent lasting time of silk. In this study, cationic and temperature-sensitive liposomes were designed and prepared to encapsulate eugenol. These fragrance-loaded liposomes significantly slowed down the release rate of the fragrance and controlled the release rate of the fragrance in a thermo-sensitive manner. The liposomes adhered to the silk through electrostatic adsorption interaction. The positive charge on the fragrance-loaded liposomes neutralized much negative charge on silk and thereby increasing the adhesion efficiency.     

气相捕获腔对石墨烯低压化学气相沉积形核生长的影响

基于石墨烯低压化学气相沉积技术,通过调控甲烷流量对比研究了传统生长腔和气相捕获腔中石墨烯在铜箔衬底上的形核生长特点.结果 表明,与传统生长腔相比,气相捕获腔能够将石墨烯的形核密度降低3个数量级,并促使石墨烯晶核快速长大.同时,气相捕获腔能够为石墨烯提供一个稳定的生长环境,有利于制备晶格完美的石墨烯晶畴,并为石墨烯晶畴的融合提供更多的有效活性碳原子,加速石墨烯晶畴之间的融合,提高石墨烯薄膜的质量.在此基础上分析了气相捕获腔对石墨烯低压化学气相沉积形核生长的影响机理.     

牛血清白蛋白中氨基酸的高效液相色谱荧光测定及质谱鉴定

利用新型荧光试剂1,2苯-并-3,4二-氢咔唑-9乙-基氯甲酸酯(BCEOC)作为柱前衍生化试剂,在Hypersil BDS C18(4.6 mm×200 mm,5μm)反相色谱柱上,采用梯度洗脱对氨基酸衍生物进行了分离检测。检测的激发和发射波长分别为λex=333 nm,λem=390 nm。采用电喷雾离子源(ESI Source),实现了牛血清白蛋白中氨基酸的定性测定。荧光定量检测的线性回归系数均大于0.999;检出限为6.3~117.6 fmo。l     

具有叶绿素基本碳架的C-3-异噁唑啉基二氢卟吩类衍生物的合成

以脱镁叶绿酸-a甲酯为起始原料,通过3-位乙烯基与氧化苯甲腈和4-取代氧化苯甲腈的1,3-偶极环加成反应,分别得到3-位异噁唑基取代的二氢卟吩衍生物以及其他形式的加成产物,对其脱镁叶绿酸的E-环结构修饰则转换成相应的二氢卟吩-p6衍生物;脱镁叶绿酸-a甲酯经空气氧化和重排反应形成了红紫素-18-内酰胺,再与4-取代氧化苯甲腈进行相同的环加成反应,也以理想的产率生成标题化合物.所得新的二氢卟吩衍生物的化学结构均经UV,IR,1H NMR 及元素分析得以证实,并对相应的反应提出可能的反应机理.     

A Closed-form Solution for Source-term Emission of Xenon Isotopes from Underground Nuclear Explosions

Transport in Porous Media - Isotopic ratios of radioactive xenons sampled in the subsurface and atmosphere can be used to detect underground nuclear explosions (UNEs) and civilian nuclear reactors....     

Dirac类氢原子的超对称方法研究

应用超对称方法研究了Ｄｉｒａｃ类氢原子问题，不需繁琐的数学处理，得到和严格解法完全一致的能量本征值谱及相应的本征函数。