Development of non-destructive discrimination method for single fibers based on the chemical structure of dyes and catalysts for social safety

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04963
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 25010:Social systems engineering-related
• Research Institution: Kochi University
• Principal Investigator: Nishiwaki Yoshinori 高知大学, 教育研究部人文社会科学系教育学部門, 教授 (50632585)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 科学捜査 / 繊維 / 染料 / 触媒 / X線分析

Outline of Final Research Achievements

Single fibers are important evidence samples for clarifying many criminal cases.
In many cases, the conventional method cannot discriminate between different types of fibers. Therefore, a new method of single fiber analysis is required. This study developed a nondestructive discrimination method for single fiber dissimilarity, focusing on elemental information and chemical structures derived from dyes and catalysts. A combination of X-ray fluorescence spectrometry (XRF) and X-ray absorption fine structure technique (XAFS) utilizing synchrotron radiation was used for the analysis method. As a result, elemental information and chemical structures derived from dyes and catalysts can be used as indicators to discriminate silk and polyester single fibers with high accuracy. This method has shown potential for use as a new nondestructive discrimination method for single fibers that can contribute to the safety of society.

Free Research Field

法化学

Academic Significance and Societal Importance of the Research Achievements

単繊維に用いられる染料・触媒は種類が多く、本研究によって開発された手法は高い異同識別力を有する。本研究は科学捜査・放射光科学の観点から、極めて高い学術的価値を有する。本研究の独創的な点は、従来、外観・色・材質によって識別していた単繊維を使用される染料・触媒で行う点である。また、本法の技術は、近年重大な環境問題とされている海洋マイクロプラスチックへの応用が期待できる。