用于湿度控制应用的化学稳定的基于碳素的共价有机框架
Leisan Gilmanova1, Volodymyr Bon1, Leonid Shupletsov1
1Chair of Inorganic Chemistry I, Technische Universität Dresden, Bergstraße 66, 01069 Dresden, Germany.
新的共价有机框架 (COF) 具有卓越的稳定性和多孔性,可有效控制室内湿度. 这些材料具有可逆的pH依赖性质,并具有先进的湿度管理应用的潜力.
科学领域:
- 材料科学
- 化学学
背景情况:
- 共价有机框架 (COF) 是具有可调的晶体多孔聚合物.
- 开发具有高表面积的稳定COF对于各种应用至关重要.
研究的目的:
- 合成和表征新型异构,化学稳定,二维的 imine COFs (DUT-175和DUT-176).
- 研究这些COF的结构,纹理和pH依赖性质.
- 评估它们在室内控制湿度的潜力.
主要方法:
- 通过 4,4'-bis(9H-carbazol-9-yl) biphenyl tetraaldehyde 与胺和胺的凝结反应合成COF.
- 使用粉末X射线衍射和高分辨率传输电子显微镜进行结构测定.
- 通过气体和蒸汽吸附进行孔径评估.
- 使用紫外线对光谱的pH依赖性质的研究.
主要成果:
- DUT-175和DUT-176成功合成了AA堆叠层结构和扭曲的六角通道孔.
- 实现了高的布鲁纳uer-Emmett-Teller (BET) 表面积 (DUT-175为1071平方米,DUT-176为1062平方米).
- 由于合的π系统和碳素单位,观察到可逆的pH依赖的质子和电荷转移.
- 优良的稳定性和水蒸气吸附/脱附等温度表明适用于湿度控制.
结论:
- 合成的COF (DUT-175和DUT-176) 是高度多孔,化学稳定,并表现出独特的pH反应行为.
- 它们显著的吸水性能和稳定性使它们成为先进的室内湿度管理解决方案的有希望的候选者.
更多相关视频
08:42Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
Published on: July 10, 2017
12:05Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
Published on: October 10, 2013
相关概念视频
Basicity of Heterocyclic Aromatic Amines
Aldehydes and Ketones with Amines: Imine Formation Mechanism
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview
Acid Halides to Carboxylic Acids: Hydrolysis
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
Acid Halides to Amides: Aminolysis
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
Multiple Halogenation of Methyl Ketones: Haloform Reaction
