二氧化硅蛋白石光子晶体中粒子重构对光学性质的影响

使用自组装法制备了蛋白石结构二氧化硅纳米球三维光子晶体,并对样品在150,300,450℃温度下进行了热处理.随热处理温度的升高,光子晶体禁带中心波长出现22.5 nm的蓝移,且禁带宽度变窄.对于在450℃热处理的样品,其测量的禁带中心波长为572.5 nm,与理论计算结果有较大差异.引起样品光学特性变化的原因是热处理...     

羧基功能化石墨烯及其壳聚糖复合膜的制备与性能

采用Hummers法制备氧化石墨,化学分散法制备羧基功能化石墨烯。采用FT-IR、XRD对产物进行表征;用静电自组装法将其与壳聚糖（CS）复合制备复合膜,对复合膜的荧光性能及其修饰玻碳电极对葡萄糖的电催化氧化还原性能进行了研究。结果表明：制备的功能化石墨烯含有羧基;壳聚糖-石墨烯复合膜具有光致发光性能;复合膜修饰玻碳电...     

Zn(II)-containing metallo-supramolecular polymers: synthesis,photophysical and electrochemical properties

Abstract

Two novel building blocks M1, M2 with different electronic structures, were synthesized based on 2,2′:6′,2″-terpyridine modified with cyano-p-phenylenevinylene (CN-PV) and carbazole moieties through Knoevenagel condensation and Suzuki coupling, respectively. Directed by transition metal ion Zn²⁺, the metallo-homopolymers P1, P2 and metallo-copolymer P3 were obtained via self-assembly polymerization. The structures of the monomers and metallo-supramolecular polymers were fully characterized by MS, ¹H-NMR and ¹³C-NMR. Meanwhile, the UV–vis absorption, photoluminescence (PL) and electrochemical properties of these compounds were systematically investigated. With respect to that of the monomers, both the UV–vis absorption and PL spectra of the polymers are significantly red-shifted. The resulting metallo-supramolecular polymers show similar double absorption peaks (342, 418?nm for P1, 339, 410?nm for P2, and 332, 412?nm for P3), which is caused by the π–π* transition and intramolecular charge transfer (ICT). Further, all the polymers display red-orange emission in toluene and narrow electrochemical energy gaps of 1.46, 1.65 and 1.48?eV for P1, P2, and P3, respectively.     

Tunable Pentapeptide Self‐Assembled β‐Sheet Hydrogels

Oligopeptide‐based supramolecular hydrogels hold promise in a range of applications. The gelation of these systems is hard to control, with minor alterations in the peptide sequence significantly influencing the self‐assembly process. We explored three pentapeptide sequences with different charge distributions and discovered that they formed robust, pH‐responsive hydrogels. By altering the concentration and charge distribution of the peptide sequence, the stiffness of the hydrogels could be tuned across two orders of magnitude (2–200 kPa). Also, through reassembly of the β‐sheet interactions the hydrogels could self‐heal and they demonstrated shear‐thin behavior. Using spectroscopic and cryo‐imaging techniques, we investigated the relationship between peptide sequence and molecular structure, and how these influence the mechanical properties of the hydrogel. These pentapeptide hydrogels with tunable morphology and mechanical properties have promise in tissue engineering, injectable delivery vectors, and 3D printing applications.     

结晶性的多孔高分子-金属配合物的最新研究进展——合成、表征和性质

由于高分子具有尺寸长短不一、柔性等特点,很难通过普通方法合成具有结晶性和多孔性的高分子材料。而高分子金属配合物材料不仅继承了高分子材料的传统性质,同时也可以获得配合物的优点,比如高结晶性和多孔性。本文系统总结了合成结晶性的多孔高分子配合物材料的方法,包括光诱导聚合法、配位自主装法、分步合成法以及后修饰法。同时介绍了它们的表征方法以及潜在应用领域,并讨论了该领域研究中存在的各种机遇与挑战。     

基于静电吸附甲苯胺蓝和纳米金固定过氧化物酶生物传感器的研究

以玻碳电极为基底,电聚合邻氨基苯甲酸(ABA),使其形成带负电的界面,通过分子间静电作用力,自组装一层带正电荷的电子媒介体甲苯胺蓝(TB),再通过媒介体的氨基吸附纳米金,最后静电吸附固定辣根过氧化物酶制备出H2O2传感器。探讨了膜聚合时间、媒介体组装时间、pH、温度、工作电位对电极响应的影响。在优化的实验条件下,该传感器对H2O2电流响应与其浓度为1.5×10-5~1.3×10-3mol/L范围内呈线性关系;检出限为5.6×10-6mol/L。此外,该传感器具有较低的工作电位,能有效地消除抗坏血酸等的干扰。     

Soluble Flavanthrone Derivatives: Synthesis,Characterization, and Application to Organic Light‐Emitting Diodes

Simple modification of benzo[h]benz[5,6]acridino[2,1,9,8‐klmna]acridine‐8,16‐dione, an old and almost‐forgotten vat dye, by reduction of its carbonyl groups and subsequent O‐alkylation, yields solution‐processable, electroactive, conjugated compounds of the periazaacene type, suitable for the use in organic electronics. Their electrochemically determined ionization potential and electron affinity of about 5.2 and ?3.2 eV, respectively, are essentially independent of the length of the alkoxyl substituent and in good agreement with DFT calculations. The crystal structure of 8,16‐dioctyloxybenzo[h]benz[5,6]acridino[2,1,9,8‐klmna]acridine ( FC‐8 ), the most promising compound, was solved. It crystallizes in space group P and forms π‐stacked columns held together in the 3D structure by dispersion forces, mainly between interdigitated alkyl chains. Molecules of FC‐8 have a strong tendency to self‐organize in monolayers deposited on a highly oriented pyrolytic graphite surface, as observed by STM. 8,16‐Dialkoxybenzo[h]benz[5,6]acridino[2,1,9,8‐klmna]acridines are highly luminescent, and all have photoluminescence quantum yields of about 80 %. They show efficient electroluminescence, and can be used as guest molecules with a 4,4′‐bis(N‐carbazolyl)‐1,1′‐biphenyl host in guest/host‐type organic light‐emitting diodes. The best fabricated diodes showed a luminance of about 1900 cd m^?12, a luminance efficiency of about 3 cd A^?1, and external quantum efficiencies exceeding 0.9 %.     

全亲水性嵌段共聚物及其超分子自组装

本文介绍了全亲水性嵌段共聚物(DHBCs)的定义与特点.根据不同的环境敏感自组装机理,分类详述了不同DHBCs的结构及其超分子自组装行为,并探讨了相应的应用现状与前景.