Unique observation and analysis of the surfaces of substances and materials can be performed using lasers.
Nanotechnology (Saitama University Research Seed Collection 2025-25 p.106)
Keywords: surface, interface, laser, spectroscopy, nonlinear optics, sum-frequency generation
Various analytical methods can be applied to liquids, but these methods analyze the bulk of the liquid. "Bulk" refers to all molecules excluding those on the surface. For example, in a water droplet with a radius of 1 millimeter, 99.9997% are bulk water molecules. Since the majority is bulk, measuring it "normally" will automatically mean that the bulk has been measured. To analyze the surface of the liquid, that is, to perform spectroscopic analysis, a "non-standard" measurement method is required to sensitively capture the very few surface molecules. The surface of the liquid has unique properties that differ from the bulk and serves as a special reaction field where atmospheric chemical reactions that influence the Earth's environment and important biochemical reactions in medicine and pharmaceuticals occur. Since 2004, I have been working on developing methods for spectroscopic analysis of liquid surfaces with the aim of enabling such analysis to have high reliability similar to that of bulk ultraviolet-visible absorption and infrared absorption.
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Professor Shoichi Yamaguchi Graduate School of Science and Engineering, Department of Materials Science, Fundamental Materials Area 【Recent Research Themes】 ● Structure of water surfaces ● Structure of ice surfaces ● Structure of high-pressure phases of water
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【Appeal Points to the Industry】 ● Unique spectroscopic analysis of liquid and solid surfaces/interfaces ● Independently developed the best method in the world for heterodyne detection and frequency generation spectroscopy 【Examples of Practical Applications and Utilization】 ● Establishment of microscopic imaging of surfactant aqueous solutions ● Research on the origins of the functions of plasma-treated surfaces
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Future wristwatch-type spectroscopic analysis device
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.