题目: Microwave Assisted Hydrothermal Syntheses of Materials
主讲人: Sridhar Komarneni（Prof.）
主持人: Wang Ni （Dr.）
时 间: 2019年4月5日（周五），10点30分
地 点: 沙河校区211楼408
Dr. Sridhar Komarneni is a Distinguished Professor in the Materials Research Institute and Department of Ecosystem Science and Management. He conducts research on nanophase and nanocomposite materials, materials processing by multi-energy assisted hydrothermal methods and sol-gel process. He has published more than 690 refereed papers and received 10 patents. He wrote or edited 11 books and received numerous awards including election as Fellow of 5 scientific societies, namely The Royal Society of Chemistry, The American Ceramic Society, Soil Science Society of America, American Society of Agronomy and The American Association for the Advancement of Science. He was also elected to European Academy of Sciences and World Academy of Ceramics. He is a Distinguished member of the Clay Minerals Society. He was recognized as a “Highly Cited Researcher” in Materials Field by ISI in 2002. His current total citations from all data bases are over 18,000 with a h-index of 69 as per ISI. He serves as the Editor-in-Chief of Journal of Porous Materials and also as Editor-in-Chief of Materials Research Innovations.
Microwave-assisted hydrothermal synthesis is a novel processing technology for the preparation of a variety of ceramic oxide and metal powders under closed system conditions. This closed system technology not only prevents pollution at its source but also saves energy and thus could substantially reduce the cost of producing fine powders of all kinds of materials. The use of microwaves in analytical chemistry to dissolve materials for chemical analysis is a common practice. During the last 35 years, this method has been shown to be applicable to inorganic (1985) and organic syntheses/reactions, organometallic syntheses, synthesis of intercalation compounds and preparation of zeolites and molecular sieves. We, however, showed for the first time starting in 1991 that microwaves under hydrothermal conditions can catalyze the synthesis of anhydrous ceramic oxides, hydroxylated phases, metal powders etc. The term “microwave-hydrothermal” (M-H) synthesis/processing was first coined by us in 1992 for reactions taking place in solutions that are heated above 100oC and in the presence of microwave field. With several examples, I will demonstrate the value of this technique in (a) rapid heating to temperature of treatment (b) increasing the reaction kinetics by one to two orders of magnitude (c) forming novel phases and (d) eliminating metastable phases. The first two features of this processing technology can lead to energy savings.