Preparation of Layered Nano-Composite by the Reaction of Ca(OH) 2 with Carboxylic Acid as the Molecular Recognition Host
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Preparation of Layered Nano-Composite by the Reaction of Ca(OH)2 with Carboxylic Acid as the Molecular Recognition Host Yusuke Edamatsu, Junichi Kobayashi and Hideyuki Tagaya Graduate School of Science and Engineering, Yamagata University, Yonezawa, Yamagata, Japan
ABSTRACT
Calcium hydroxide was reacted with aliphatic calboxylic acids having the different number of carbons, and the precipitated products were characterized by TG, SEM, TEM and XRD. Layered structure was confirmed by TEM images and XRD patterns. From the results of XRD patterns, the interlayer spacing d increased with an increase of the number of carbons of carboxylic acids from 30 Å to 60 Å , and it was proportional to the carbon number of the materials. Calculated angles of the long chain fatty acids in the crystal structures of the reaction products was about sixty degrees. The adsorption ability of the nanocomposite prepared with stearic acid was carried out by using the mixture of three organic compounds at room temperature. For the adsorption experiment, only one kind of organic matters was selectively adsorbed.
INTRODUCTION Recently, the study on the preparation of organic-inorganic composites organized at nano level has been carried out actively. Organic-inorganic nano-hybrids are characterized by having useful new properties compared to conventional materials, so they can be recognized as functional compounds with high possibilities [1-4]. 2D materials are relatively large in surface area and expected to exhibit excellent adsorption performance. Since layered composites have layer spaces, there is a possibility of having size-selective adsorption abilities [5]. We have already succeeded to construct the organic-inorganic composites with the layered structure at the nano level by selforganizing reaction of metal hydroxides and organic substances and have made their properties clear [6-9]. In this study, the layered structure and the alternative adsorption ability of the compounds were obtained by the reaction of Ca(OH)2 with calboxylic acids for the first time. Calcium doesn’t affect the human body, and it is well known that long chain aliphatic carboxylic acids are playing important roles in the body. Layered hydroxide salts (LHSs) may be possible to interact with even bulkier substances such as very long chain calboxylic acids [10, 11]. Moreover, it was suggested that the control of interlayer spacing is easy by using various length of n-fatty acids. The layered compounds containing calboxylic acids between the layers may distinguish only a substance of a certain size from the mixture. To remove harmful substances from body fluids and adsorption of odorous components in atmosphere can be expected, therefore it Downloaded https://www.cambridge.org/core. Teachers College Library - Columbia University, 21 Janvalue. 2018 at 23:53:01, subject to has afrom great potential as a useful layered composite material with high on added the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2018.8
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