Vol.9 No.3 2017

Research paper : Development of HASClay® as a high-performance adsorption material (M. Suzuki et al.)−162−Synthesiology - English edition Vol.9 No.3 (2017) since we had experience in studying the humidity controlling material using allophane as shown in Subchapter 2.2.The research of the humidity controlling building materials was conducted in a framework where the synthesis company supplied the synthesized HASClay precursor, this HASClay precursor was used at the Experimental Building for Environment-Friendly Building Materials of AIST Chubu, and AIST conducted the performance evaluation.For the adsorption evaluation of carbon dioxide, it was shown that the adsorption volume was higher at atmospheric pressure or higher, compared to the generally used zeolite.[19] For the adsorption of carbon dioxide, we had the experience of conducting subcontracted development of a substance using imogolite that could store carbon dioxide under a high-pressure condition.4.3 Development for expanding the marketAs explained above, we were able to show the adsorption capacity of water vapor and carbon dioxide, and since we had prospect for companies to produce HASClay and to fabricate desiccant rotors, we did a press release to widen the market. For water vapor, we conducted a press release in October 2008 using the data for HASClay GI, and for carbon dioxide, we did one using the data for HASClay GIII in December 2008.The reaction after the press releases was great. There was much interest in vapor adsorption, and we received numerous inquiries. On the other hand, for carbon dioxide, although we had inquiries from companies that had high carbon dioxide emission like iron making and cement, the majority of inquiries were from educational science magazines.Concerning the demands from outside AIST, there were many that were quite unimaginable for us within the institute, and we led patents jointly following joint research. Although it is possible to imagine one application for one material, we felt the importance of collaborating with outside organizations for variation. Figure 13 shows the development of HASClay usage one year after the press release. The elds in which imogolite is used as shown in Fig. 5 and the elds for HASClay shown in Fig. 13 are basically the same. When imogolite and HASClay are compared carefully, in the adsorption of water vapor, imogolite has high adsorption/desorption in the low-humidity range and high-humidity range, while HASClay has high adsorption/desorption in the medium-humidity range, and therefore it is more suitable as a desiccant air conditioning material. On the other hand, the form of imogolite is tubular, while the form of HASClay is granular, and the use as a filler that was considered for imogolite cannot be covered by HASClay.The promotion of photosynthesis in greenhouse cultivation using carbon dioxide was a rather shocking research. In general, the recovery and use of carbon dioxide are mostly conducted for the reduction of carbon dioxide emission to prevent global warming, while the use of carbon dioxide in the agricultural eld is not for preventing global warming, but is purely for improving productivity and quality. Fortunately, we were able to work with the people from the Nara Prefecture Agricultural Research and Development Center who were experts in strawberry species development and cultivation, and we obtained public funds to develop a carbon dioxide recovery and delivery system unseen before.[20] At the time of application to the public funds, we stated that carbon dioxide could be stored using HASClay, but the project was ultimately successful because we made the decision to switch to zeolite in the middle of the R&D due to efciency consideration.The research for the recovery and use of carbon dioxide involved the following framework: AIST worked on the selection of suitable materials for the recovery of carbon dioxide; the Nara Prefecture Agricultural Research and Development Center and Tohoku Agricultural Research Center, National Agriculture and Food Research Organization investigated the effect of carbon dioxide on strawberries, roses, and Eustomas; and the companies fabricated the whole heat exchange system that decreased the temperature of exhaust ・Recovery (reuse)Organic solvent・Recovery (raw material)・Recovery (underground storage)・Agricultural eld (photosynthesis promoter)Carbon dioxide・Desiccant air conditioning・Humidity control building material・Temperature sensor・Condensation preventionWater vaporHASClayFig. 12 Application of interior finishing material that contains HASClay(At AIST Chubu)Fig. 13 Fields in which HASClay is used

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