共查询到18条相似文献,搜索用时 46 毫秒
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化学响应性光子晶体 总被引:1,自引:0,他引:1
光子晶体是一种具有光子带隙结构的周期性电介质材料,如果将响应性材料组装到光子晶体结构中,所形成的光子晶体的带隙结构则对外界环境的变化具有响应性,而被称为响应性光子晶体。响应性光子晶体作为光子晶体的一个新领域,由于其在传感器,生物医学,临床检测等方面的潜在应用,近几年受到广泛关注。根据外界环境的不同,响应性光子晶体可简单分为化学响应性光子晶体、物理响应性光子晶体和生物响应性光子晶体等。本文将对化学响应性光子晶体的国内外研究动态做一简要介绍,重点介绍以下五种化学响应性光子晶体:金属离子响应光子晶体、pH响应光子晶体、氧化还原响应光子晶体、葡萄糖响应光子晶体和光化学响应光子晶体。 相似文献
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响应性光子晶体以其亮丽的结构色彩及光学信号对外场刺激的响应性变化,在化学传感、智能显示等领域具有重要的应用前景.本文综述了快速响应聚合物光子晶体的研究进展.首先从原理上阐述了影响溶胀型光子晶体响应速率的因素,系统总结了针对不同因素提高其响应速率的研究工作,着重探讨了溶胀型光子晶体水凝胶的尺寸、聚合物链段的物理化学性能(包括多孔结构和亲疏水性)、凝胶网络的交联度等因素对响应速率的影响.同时也简要介绍了影响非溶胀型响应性光子晶体,如光、电、磁、机械力等外场诱导体系折光指数变化的响应性光子晶体的响应速率的因素.最后展望了响应性光子晶体的热点研究方向.这些工作对于提高光子晶体的响应速率,发展其在实时分析、在线检测等领域的应用具有重要意义. 相似文献
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具有刺激响应性的智能驱动材料已成为材料科学领域的研究热点之一。液晶的超分子自组装结构与其刺激响应特性使其在新型智能功能材料的开发应用上具有天然优势。蓝相液晶由于其独特的三维超分子自组装结构、软物质特性以及可见光波段的选择性光反射,被认为是最具潜力的智能光子晶体材料之一。在温度、光照、电场、湿度等外场刺激作用下,蓝相超分子自组装结构的晶体学参数或相态非常容易发生变化,造成光子带隙的改变进而呈现出反射颜色的变化。因此,蓝相的外场响应性能及在智能材料上的应用引起了研究者的广泛关注。本文综述了智能响应蓝相液晶光子晶体外场响应性能方面的前沿动态,对蓝相液晶光子晶体的光、磁、电、力、湿度响应等方面取得的系列重要的研究成果进行了总结,并对该领域目前存在的挑战以及未来发展趋势做出展望。 相似文献
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以改进的对流自组装方法制备层数可控的胶体光子晶体, 并通过各向同性氧等离子体(O2 Plasma)刻蚀构造出梯度结构, 进一步通过金(Au)及无定形硅(Si)的可控沉积调节梯度结构胶体光子晶体的光子禁带, 并将该梯度结构用于罗丹明B的荧光发射增强. 相似文献
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首先采用Stber方法制备了一系列亚微米级单分散二氧化硅小球,而后通过垂直沉降自组装方法制备了颜色鲜艳的二氧化硅三维有序结构胶体晶体模板,最后再采用模板聚合法在220 nm二氧化硅小球自组装的阵列间隙中共聚甲基丙烯酸和乙二醇二甲基丙烯酸酯,经氢氟酸刻蚀二氧化硅模板后得到多孔有序的反蛋白石光子晶体.当pH值从5升至8时,反蛋白石凝胶光子晶体的反射峰波长从514 nm移动至590 nm,颜色变化显著,从蓝绿色变成红色,突变点为pH=6.5,而且pH响应在100 s左右即可达到平衡.对交联剂用量的研究结果表明,随着交联剂乙二醇二甲基丙烯酸酯用量从4%增加到16%,光子晶体响应pH时的红移量减小. 相似文献
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光子晶体是一种介电常数周期变化的功能材料,其基本特征是具有光子带隙。光子晶体理论诞生已三十年,基于理论及实验的研究取得了许多成绩。当所制备的光子带隙与光波的波长相当时,光子晶体材料抑制光子在一定频段内的传播。由于在光学、电学、热学、磁学等方面均有优良特性和潜在应用,光子晶体作为一种新型材料也越来越受到科研人员的青睐。不论在可加工性方面还是在传播特性方面,二维光子晶体的优势正逐渐体现出来。本文重点阐述二维光子晶体的研究进展,分别介绍了二维光子晶体的结构与性能特点以及近年来发展出的新型制备方法,如自组装法、刻蚀法、多光束干涉法等,并着重列举其在传感器、波导、光纤、太赫兹技术等领域的发展现状,表明二维光子晶体作为超材料具有巨大的发展空间和潜力。最后,本文对二维光子晶体今后的研究方向和发展前景作了展望。 相似文献
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Dr. Michael Giese Dr. Lina K. Blusch Dr. Mostofa K. Khan Dr. Wadood Y. Hamad Prof. Mark J. MacLachlan 《Angewandte Chemie (International ed. in English)》2014,53(34):8880-8884
Cellulose‐based materials have been and continue to be exceptionally important for humankind. Considering the bioavailability and societal relevance of cellulose, turning this renewable resource into an active material is a vital step towards sustainability. Herein we report a new form of cellulose‐derived material that combines tunable photonic properties with a unique mesoporous structure resulting from a new supramolecular cotemplating method. A composite of cellulose nanocrystals and a urea–formaldehyde resin organizes into a chiral nematic assembly, which yields a chiral nematic mesoporous continuum of desulfated cellulose nanocrystals after alkaline treatment. The mesoporous photonic cellulose (MPC) films undergo rapid and reversible changes in color upon swelling, and can be used for pressure sensing. These new active mesoporous cellulosic materials have potential applications in biosensing, optics, functional membranes, chiral separation, and tissue engineering. 相似文献
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Biting Zhu Qianqian Fu Ke Chen Prof. Jianping Ge 《Angewandte Chemie (International ed. in English)》2018,57(1):252-256
Nitrogen adsorption–desorption for mesopore characterization requires the using of expensive instrumentation, time‐consuming processes, and the consumption of liquid nitrogen. Herein, a new method is developed to measure the pore parameters through mixing a mesoporous substance with a supersaturated SiO2 colloidal solution at different temperatures, and subsequent rapid measurement of reflection changes of the precipitated liquid photonic crystals. The pore volumes and diameters of mesoporous silica were measured according to the positive correlation between unit mass reflection change (Δλ/m) and pore volume (V), and the negative correlation between average absorption temperature (T) and pore diameter (D). This new approach may provide an alternative method for fast, convenient and economical characterization of mesoporous materials. 相似文献
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This Review summarizes recent developments in the field of responsive photonic crystal structures, including principles for design and fabrication and many strategies for applications, for example as optical switches or chemical and biological sensors. A number of fabrication methods are now available to realize responsive photonic structures, the majority of which rely on self-assembly processes to achieve ordering. Compared with microfabrication techniques, self-assembly approaches have lower processing costs and higher production efficiency, however, major efforts are still needed to further develop such approaches. In fact, some emerging techniques such as spin coating, magnetic assembly, and flow-induced self-assembly have already shown great promise in overcoming current challenges. When designing new systems with improved performance, it is always helpful to bear in mind the lessons learnt from natural photonic structures. 相似文献
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M. Sc. Christoph Fenzl Dr. Thomas Hirsch Prof. Otto S. Wolfbeis 《Angewandte Chemie (International ed. in English)》2014,53(13):3318-3335
This Review covers photonic crystals (PhCs) and their use for sensing mainly chemical and biochemical parameters, with a particular focus on the materials applied. Specific sections are devoted to a) a lead‐in into natural and synthetic photonic nanoarchitectures, b) the various kinds of structures of PhCs, c) reflection and diffraction in PhCs, d) aspects of sensing based on mechanical, thermal, optical, electrical, magnetic, and purely chemical stimuli, e) aspects of biosensing based on biomolecules incorporated into PhCs, and f) current trends and limitations of such sensors. 相似文献
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Ing. Jean‐Philippe Couturier Dr. Martin Sütterlin Prof. Dr. André Laschewsky Dr. Cornelia Hettrich Dr. Erik Wischerhoff 《Angewandte Chemie (International ed. in English)》2015,54(22):6641-6644
Dual responsive inverse opal hydrogels were designed as autonomous sensor systems for (bio)macromolecules, exploiting the analyte‐induced modulation of the opal’s structural color. The systems that are based on oligo(ethylene glycol) macromonomers additionally incorporate comonomers with various recognition units. They combine a coil‐to‐globule collapse transition of the LCST type with sensitivity of the transition temperature toward molecular recognition processes. This enables the specific detection of macromolecular analytes, such as glycopolymers and proteins, by simple optical methods. While the inverse opal structure assists the effective diffusion even of large analytes into the photonic crystal, the stimulus responsiveness gives rise to strong shifts of the optical Bragg peak of more than 100 nm upon analyte binding at a given temperature. The systems’ design provides a versatile platform for the development of easy‐to‐use, fast, and low‐cost sensors for pathogens. 相似文献
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Dr. Jue Hou Prof. Dr. Mingzhu Li Prof. Dr. Yanlin Song 《Angewandte Chemie (International ed. in English)》2018,57(10):2544-2553
Colloidal photonic crystals (PCs) have been well developed because they are easy to prepare, cost‐effective, and versatile with regards to modification and functionalization. Patterned colloidal PCs contribute a novel approach to constructing high‐performance PC devices with unique structures and specific functions. In this review, an overview of the strategies for fabricating patterned colloidal PCs, including patterned substrate‐induced assembly, inkjet printing, and selective immobilization and modification, is presented. The advantages of patterned PC devices are also discussed in detail, for example, improved detection sensitivity and response speed of the sensors, control over the flow direction and wicking rate of microfluidic channels, recognition of cross‐reactive molecules through an array‐patterned microchip, fabrication of display devices with tunable patterns, well‐arranged RGB units, and wide viewing‐angles, and the ability to construct anti‐counterfeiting devices with different security strategies. Finally, the perspective of future developments and challenges is presented. 相似文献