聚硅氧烷超分子BPEAS/MAn-BPEAS的构筑及应用性能

以嵌段聚醚氨基硅(BPEAS)、马来酸酐为原料合成了羧基改性的嵌段聚醚氨基硅(MAn-BPEAS),用红外光谱(IR)对产物结构进行表征。用非离子表面活性剂异构醇聚氧乙烯醚(XL)将BPEAS与MAn-BPEAS乳化,制得外观半透明乳液。在自组装理论的指导下,将制得的乳液等质量混合进行静电自组装,得到超分子乳液。利用纳米粒度表面电位分析仪测定了自组装前后的乳液中胶束的粒径。将制得的超分子乳液应用于织物整理,并通过扫描电镜观察织物表面的膜形貌。考察了BPEAS、MAn-BPEAS及其超分子乳液在棉织物上的应用性能。     

羧酸甜菜碱甲基丙烯酸酯与DNA组装体系的耗散粒子动力学模拟

采用耗散粒子动力学模拟方法(DPD)研究了聚羧酸甜菜碱甲基丙烯酸酯(PCBMA)在不同浓度及pH下在水中的自组装与解组装情况,以及PCBMA与DNA的组装情况。模拟结果显示,不同浓度下,聚合物在水中依次形成球状、柱状、层状纳米粒子。pH下降时,DNA能被释放出来。     

石墨烯/二氧化锰复合材料的制备与电化学性能

通过改性二氧化锰和氧化石墨烯片之间的静电自组装制备了层状的rGO/MnO2复合纳米材料。通过XRD分析材料的晶体结构,用扫描电镜观察材料的微观表面形貌。这种材料用来研究其电化学电容性能,结果表明这种纳米复合材料显示出很好的电容性能(在0.2 A/g的电流密度下可达246 F/g)。此外,在2 A/g的电流密度下循环1000次后容量保持率为91%。材料的性能提升是因为复合材料中二氧化锰纳米棒和石墨烯片层很好的贴合,而石墨烯片的加入也大大提高了材料的导电性。     

Liquid Crystalline Assembly of Coil-Rod-Coil Molecules with Lateral Methyl Groups into 3-D Hexagonal and Tetragonal Assemblies

In this paper, we report the synthesis and self-assembly behavior of coil-rod-coil molecules, consisting of three biphenyls linked through a vinylene unit as a conjugated rod segment and poly(ethylene oxide) (PEO) with a degree of polymerization (DP) of 7, 12 and 17, incorporating lateral methyl groups between the rod and coil segments as the coil segment. Self-organized investigation of these molecules by means of differential scanning calorimetry (DSC), thermal polarized optical microscopy (POM) and X-ray diffraction (XRD) reveals that the lateral methyl groups attached to the surface of rod and coil segments, dramatically influence the self-assembling behavior in the liquid-crystalline mesophase. Molecule 1 with a relatively short PEO coil length (DP = 7) self-assembles into rectangular and oblique 2-dimensional columnar assemblies, whereas molecules 2 and 3 with DP of 12 and 17 respectively, spontaneously self-organize into unusual 3-dimensional hexagonal close-packed or body-centered tetragonal assemblies.     

新型超分子化合物的合成自组装及应用研究的新进展

简要介绍了超分子化学的定义、概念、产生及应用,详细介绍了:①新型超分子化合物合成及自组装;②新型超分子化合物的合成及选择性识别作用;③超分子冠醚金属配合物的合成及应用。     

Fiber-Based Composite Tissue Engineering Scaffolds for Drug Delivery

Drug delivery through tissue-engineered scaffolds provides a composite approach to address the regenerative limitations of simple material implantation, providing expanded avenues for therapeutic tissue-repair strategies in the clinic. Both nano- and microfibrous scaffolds generated by a variety of techniques have been investigated for their potential in drug-delivery applications. While nanofibers mimic the structure and organization of natural extracellular matrix, microfibers provide more sustained release of drugs, larger pores to facilitate cell infiltration, and improved mechanical support. Various methods exist to embed drugs within the fiber matrix to modulate the release kinetics specific to the tissue-engineering application. The current article reviews the established and emerging fabrication methods for drug-loaded fiber-based scaffolds and addresses how further combination into composite scaffolds can enhance drug delivery and tissue regeneration.     

Complex Adaptable Systems based on Self-Assembling Dendrimers and Dendrons: Toward Dynamic Materials

Self-assembling dendrons are biologically inspired complex systems that can form self-organized periodic arrays in the bulk state. Here we adopt the point of view of Constitutional Dynamic Chemistry (CDC) to discuss the design and properties of self-assembling dendrimers and dendronized structures. Among other objectives, CDC seeks to generate chemical diversity through constitutional dynamics, and to improve the design of dynamic materials using adaptive systems. Can we address these issues with dendrimer chemistry? We will show that generational and co-assembly approaches in the synthesis of self-assembling dendritic systems lead to a remarkable collection of periodic lattices and quasi-periodic arrays. Moreover, in some cases the morphological properties of the resulting supramolecular structures can be tuned by external signals. These dendron-based adaptive systems find applications in various fields such as nano-machines and switches or porous protein mimics.     

Fiber Optic Humidity Sensor Based on Self-Assembled Polyelectrolyte Multilayers

Polyelectrolyte multilayers were self-assembled onto planar glass substrates and midtimode optic fibers . The multilayer thin films deposited on glass substrates were characterized by using UV-vis spectroscopy and X- ray photoelectron spectroscopy. The multilayer thin films containing hydrophilic side-groups possessed are affinity for water molecules. The adsorption and desorption of free water vapor gave rise to the changes in the refractive index and in the reflectance of the thin films. A multilayer thin film based fiber optic humidity sensor with an LED light source of 0.85 μm was designed. Under certain conditions, the reflected light intensity of the thin film sensor was a function of the humidity of air. About 30 bilayers was optimal for the multilayer thin film sensor working at wavelength of 0.85μm. This sensor can work over almost the whole relative humidity range with very good sensitivity.     

大孔氧化铝载体上制备MCM-48膜的研究

在大孔氧化铝载体上原位制备具有三维孔道的MCM-48中孔膜,并研究了合成溶胶pH值的变化和膜的形成过程.采用XRD,SEM,气体渗透测试等手段对膜材料的表面形貌,结构和气体渗透性能进行表征,并初步探讨了在大孔载体上成膜的机理.结果表明:载体的大孔、膜的合成次数等因素对形成较为完整的中孔膜影响较大.由于载体孔径较大,担载膜层内部应力随着合成次数的增加也逐渐累积.三次合成的膜有较好的形貌结构和渗透性能,而多于三次的合成膜体开始出现裂纹,致使不能更深的提高膜渗透性能;同时在碱性合成溶胶的影响下,在膜组装的界面处,除了存在无机前躯体与模板剂的自组装过程,同时也存在原膜层的部分解聚,因而,虽然膜的致密性随合成次数的增加而增大,而膜厚度却增加很少.