Polymerizable Molecular Silsesquioxane Cage Armored Hybrid Microcapsules with In Situ Shell Functionalization

We prepared core–shell polymer–silsesquioxane hybrid microcapsules from cage‐like methacryloxypropyl silsesquioxanes (CMSQs) and styrene (St). The presence of CMSQ can moderately reduce the interfacial tension between St and water and help to emulsify the monomer prior to polymerization. Dynamic light scattering (DLS) and TEM analysis demonstrated that uniform core–shell latex particles were achieved. The polymer latex particles were subsequently transformed into well‐defined hollow nanospheres by removing the polystyrene (PS) core with 1:1 ethanol/cyclohexane. High‐resolution TEM and nitrogen adsorption–desorption analysis showed that the final nanospheres possessed hollow cavities and had porous shells; the pore size was approximately 2–3 nm. The nanospheres exhibited large surface areas (up to 486 m² g^?1) and preferential adsorption, and they demonstrated the highest reported methylene blue adsorption capacity (95.1 mg g^?1). Moreover, the uniform distribution of the methacryloyl moiety on the hollow nanospheres endowed them with more potential properties. These results could provide a new benchmark for preparing hollow microspheres by a facile one‐step template‐free method for various applications.     

Self‐assembly synthesis and structure of mono‐ and di‐nuclear uranyl complex

Mixing the malonate (mal), 4,4′‐bipyridine, UO₂(CH₃COO)₂ · 2H₂O in different solvent condition gets two compounds (bpy)₂(H₂bpy)[UO₂(mal)₂(μ‐H₂O)] · 8H₂O (1) and (H₂bpy)[UO₂(mal)₂] · 2H₂O (2) . Both complexes contain seven‐coordinated pentagonal bipyramidal uranium center. Crystal 1 is mononuclear structure and crystal 2 contains dinuclear [(UO₂)₂(mal)₂(μ₂‐mal)₂]^4‐ subunit. Particularly, Crystal 2 forms the twodimensional supramolecular topology by hydrogen bonds. The sheet constructs from two sorts of chamber, of which the larger one has two water molecular guests. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

电磁带隙结构在天线雷达散射截面减缩中的应用

 提出了一种使用电磁带隙结构来减小微带印刷对称阵子天线雷达散射截面的方法。该方法利用电磁带隙结构的带阻特性,使其能作为天线的地板,在带外(非谐振)时,电磁带隙结构对入射电磁波起滤波作用。仿真和实验的结果表明,电磁带隙结构能保证天线在带内辐射不受影响的同时,还大幅度地降低了天线带外的雷达散射截面。     

考虑互耦的半波振子线阵辐射和散射方向图综合

对于半波振子阵列天线,可用感应电动势法算得其阻抗矩阵,依据等效电路原理计入单元间的互耦计算辐射场.将其推广至考虑互耦的散射场计算,基于此辐射场和散射场的计算公式,提出一种考虑互耦同时综合半波振子阵列天线辐射和散射方向图的新方法.运用粒子群优化算法,通过优化振子的间距,同时综合指定辐射和散射方向图.运用该方法,通过对中心工作频率处的辐射和散射特性以及在威胁角度给定频带内的散射特性优化,有效降低半波振子阵在中心工作频率处的辐射和散射方向图的副瓣电平,并减小其在威胁角度给定频带内的雷达散射截面.计算结果与FEKO仿真结果吻合良好,验证方法的正确性.     

Synthesis and Crystal Structure of a New Copper–PMIDA Compound (H4PMIDA=H2O3PCH2N(CH2CO2H)2)

A new Cu(II)PMIDA compound [Cu(H₂PMIDA)(phen)] 3H₂O (1) (H₄PMIDA = H₂O₃PCH₂N (CH₂CO₂H)₂,phen = 1,10-phenanthroline) has been successfully synthesized and structurally characterized. In complex 1, Cu (II) is six coordinated by chelation in a tetradentate fashion by a PMIDA ligand and by two N atoms of a phen ligand. Every phen–Cu(II)–PMIDA group connects with each other via a hydrogen bond and the edge-to-face -stacking interaction. Complex 1 crystallized in triclinic P-1 with cell dimensions of a = 7.5817(6) Å, b = 10.6980(8) Å, c = 13.1852(10) Å, =82.350(2)°, = 84.151(2)°, =78.4250(2), V= 1035.25(14) ų, Z = 2, Dc = 1.677 Mg/m³.     

Solvothermal Synthesis and Structure of Two 2D Tin–Selenides with Long Alkyldiamine NH2(CH2) n NH2 (n = 8, 10)

Reactions of NH₂(CH₂) _n NH₂ (n = 8,10) with elemental Sn and Se in a H₂O/CH₃OH mixture at 150°C afford two compounds (NH₃(CH₂)₈NH₃)Sn₃Se₇ (1) and (NH₃(CH₂)₈NH₃)Sn₃Se₇ (2). The crystal structures were determined by single crystal X-ray diffraction at room temperature. Both compounds exhibit the same anionic structure—a 6³ netted plane composed of [Sn₃Se₇]^2– subunits. The distance between the centers of crystal 1 layers is 7.5 Å, somewhat shorter than the distance (8.5 Å) in crystal 2.     

复广义权的细连续性

本文引入细复广义权和Ｃｈｏｑｕｅｔ型复广义权的概念．讨论了某些与复广义权相关的函数的拟连续性与细拟处处连续的关系．     

零理想边界的素端上某类椭圆型方程的非负解

考虑具有零理想边界的非紧镶边Ｒｉｅｍａｎｎ曲面Ω＝Ω∪　Ω及其上的Ｄｉｒｉｃｈｌｅｔ积分有限的非负局部Ｈｏｌｄｅｒ连续的二重共变量Ｐ．用Ｆ表示方程上Δｕ＝Ｐｕ在 Ω取极限值０的非负连续解全体．本文讨论拟Ｐｉｃａｒｄ原理成立的充要条件并证明：若Ω的每一理想边界点都有端邻域满足广义Ｈｅｉｎｓ条件,则Ｍａｒｔｉｎ函数全体所成之集是Ｆ中的极小正解全体所支撑的子半线性空间Ｐ的一个Ｈａｍｅｌ基,而且Ｆ可表示为与Ｐ相关的直和形式．     

复广义权与拟连续性

本文引入复广义权的外权的概念，讨论了某些与复广义权相关的函数的拟连续性。     

山嵛酸Langmuir膜结合氨气扩散控制生长碱式硝酸锌的分形结构

以山嵛酸(BA) Langmuir膜为仿生矿化模板, 结合氨气动态扩散控制方法, 在气-液界面上制备了取向单一的Zn5(OH)8(NO3)2•2H2O分形结构材料. 利用扫描电子显微镜(SEM)和X射线衍射(XRD)分别对样品形貌及其晶型进行了表征. 结合π-A曲线研究了分形结构生长的驱动力, 并详细分析了分形生长的过程和机理. 认为Langmuir膜的存在导致了材料单一的晶面取向, 而氨气在气-液界面的动态扩散提供了分形结构形成的驱动力. 这有可能为控制合成一系列具有特殊结构的无机晶体材料提供一种可行的方法.