Functional Nanoparticles for Lighting Materials and Antibacterial Coatings

用于照明材料和抗菌涂料的功能纳米颗粒

• 批准号: 253312863
• 负责人: Professorin Dr. Claudia Wickleder
• 金额: --
• 依托单位: Arbeitskreis Anorganische Chemie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/253312863?language=en
• 关键词: Functional; Nanoparticles; Lighting; Materials; Antibacterial

In this project we aim for three main objectives: firstly Eu2+ containing nanoparticles which are very important for lighting functional materials can be produced with ionic liquids as starting materials with a much better quality and a smaller size as our preliminary works show. Compared to the melting method which is currently used for the production of these materials our new method save a lot of raw materials, energy and time. Furthermore, new nanosized luminescence materials can be prepared by this method which is not known yet. Another approach is the development of functional materials for antibacterial coatings. A third goal of this project is the investigation of extremely small Eu2+ doped particles which are suitable to answer the question if the luminescence properties of these ions can be changed with the particle size. This would in fact lead to a new strategy for the development of functional materials for many purposes. Ideal candidates for these studies are fluorides, oxides and sulfides, undoped or doped with divalent lanthanide (Ln2+) ions, due to their expanded bandgap, antiseptic or semiconductor character. Nevertheless, the currently available synthesis methods are not appropriated for the preparation of these lattices in a small nanoscale. Especially for Ln2+-doped crystals, the oxidative nature of water and other conventional solvents consist a major obstacle. The ultimate solution of this impasse is offered by ionic liquid (IL)-assisted synthesis methods. Because of the high polar and coordinative environment, ILs are able to easily solve reactants and stabilize the particle surface, avoiding undesired crystal growth. In contrast with water, ILs are able to stabilize lanthanide ions in the divalent state, enabling the direct precipitation of Ln2+ particles and avoiding post-synthetic reducing annealing steps at T > 1000°C and artificial atmosphere.

在这个项目中，我们的目标是三个主要目标：首先，与熔化相比，用离子液体作为起始材料可以生产出对照明功能材料非常重要的含Eu2+纳米颗粒，其质量要好得多，尺寸要小得多。目前用于生产这些材料的方法我们的新方法节省了大量的原材料、能源和时间此外，通过这种方法可以制备新的纳米尺寸发光材料，这是目前未知的另一种方法。材料该项目的第三个目标是研究极小的Eu2+掺杂颗粒，这些颗粒适合回答这些离子的发光特性是否可以随颗粒尺寸变化的问题。这实际上将带来一种新的策略。这些研究的理想候选材料是未掺杂或掺杂二价镧系元素 (Ln2+) 离子的氟化物、氧化物和硫化物，因为它们具有膨胀性。然而，目前可用的合成方法并不适合制备这些小纳米级晶格，特别是对于 Ln2+ 掺杂晶体，水和其他常规溶剂的氧化性质是主要的最终障碍。离子液体（IL）辅助合成方法可以解决这一僵局，由于离子液体具有高极性和配位环境，因此能够轻松溶解反应物并稳定颗粒表面，从而避免了这一问题。与水相比，离子液体能够稳定二价态的镧系离子，从而能够直接沉淀 Ln2+ 颗粒，并避免在 T > 1000°C 和人造气氛下进行合成后还原退火步骤。