Precursor reaction kinetics control compositional grading and size of CdSe<sub>1−x</sub>S<sub>x</sub> nanocrystal heterostructures
作者:Leslie S. Hamachi、Haoran Yang、Ilan Jen-La Plante、Natalie Saenz、Kevin Qian、Michael P. Campos、Gregory T. Cleveland、Iva Rreza、Aisha Oza、Willem Walravens、Emory M. Chan、Zeger Hens、Andrew C. Crowther、Jonathan S. Owen
DOI:10.1039/c9sc00989b
日期:——
We report a method to control the composition and microstructure of CdSe1-x S x nanocrystals by the simultaneous injection of sulfide and selenide precursors into a solution of cadmium oleate and oleic acid at 240 °C. Pairs of substituted thio- and selenoureas were selected from a library of compounds with conversion reaction reactivity exponents (k E) spanning 1.3 × 10-5 s-1 to 2.0 × 10-1 s-1. Depending
我们报告了一种通过在 240 °C 下将硫化物和硒化物前体同时注入油酸镉和油酸溶液中来控制 CdSe1-x S x 纳米晶体的组成和微观结构的方法。一对取代的硫代和硒脲选自化合物库,其转化反应反应指数 (k E) 跨越 1.3 × 10-5 s-1 至 2.0 × 10-1 s-1。根据相对反应性 (k Se/k S),获得核/壳和合金结构。使用注射泵方法生长厚 CdS 外壳可在单个反应容器中提供克数量的明亮光致发光量子点 (PLQY = 67 至 90%)。动力学模拟预测,小于 10 的相对前体反应率会导致合金成分,而较大的反应性差异会导致突然的界面。CdSe1-x S x 合金 (k Se/k S = 2.4) 显示出两种纵向光学声子模式,具有合金微观结构的成分相关频率特征。当一种前体比另一种更具反应性时,其转化反应性和摩尔分数控制核数、完全转化时的最终纳米晶体尺寸和元素组成。讨论了控制反应性在调整合金微观结构中的作用。
5,6-dihydropyrone derivatives as protease inhibitors and antiviral agents
申请人:Warner-Lambert Company
公开号:US05789440A1
公开(公告)日:1998-08-04
The present invention relates to novel 5,6-dihydropyrone derivatives and related structures which potently inhibit the HIV aspartyl protease blocking HIV infectivity. The 5,6-dihydropyrone derivatives are useful in the development of therapies for the treatment of bacterial and viral infections and diseases, including AIDS. The present invention is also directed to methods of synthesis of multifunctionalized 5,6-dihydropyrones and of related structures.
Polymers include a monomer with a polyurethane, a supramolecular moiety, an elastomer moiety and a functional group that includes a —C═N— link. The polymers can be prepared and incorporated into a composition. The polymers can be double dynamic polymers, which present adhesive and self-healing properties. The polymers can also be recyclable.