Soft Solution-Processing /Concept and realization of fabrication processing of high performance inorganic materials in compatible ways with the metabolism of earth

摘要

Features of materials production in ecological (biological) and industrial systems have been considered in view of environmental impacts based upon mainly energy consumption in both systems. Materials production in industrial systems can be characterized to be just high efficiency, high rate and mass production using processings with unlimited reaction media, raw materials and conditions thus it would bring about high environmental impacts. Materials production in ecological systems is limited in materials and energies included in reactions thus environmentally friendly in comparison with industrial systems. These difference can be interpreted by energy level of materials and reactions. In order to reduce environmental impacts, we must use solution processing in the fabrication processes of inorganic materials in their industrial fabrication.Based upon above consideration, we have proposed "Soft Solution-Processing" where high performance inorganic materials like ceramics and / or compound semiconductors can be fabricated directly on constituent substrates in solutions. Double oxides, perovskites as BaTiO_3, SrTiO_3, Sheelites as BaWO_4, SrMoO_4, LiMO_2 (M=Co, Ni), Hydroxyapatite and some carbon materials could be prepared in film forms on constituent substrates in aqueous solutions at low temperatures of <200 deg C mostly 120-150 deg C. Fabrication of other materials from solution precursors are also discussed.