PROBLEM TO BE SOLVED: To provide a technology for nanoparticle colloid of hardly-soluble organic substance with high purity which has excellent dispersion stability and storage stability, and no impurity, a technology for nanoparticle colloid which maintains a structure of original hardly-soluble organic substance and has improved functions, such as activity and reactivity, compared with, for example, a solution of the organic substance, and a technology for nanoparticle colloid in which nanoparticles have high surface modification performance.SOLUTION: In a nano-dispersion method of hardly-soluble organic substance, the hardly-soluble organic substance is irradiated with an ultrashort pulse laser beam in a liquid or solid medium and is subjected to laser ablation, the hardly-soluble organic substance is refined to nanoparticles, and the nanoparticles are dispersed in the liquid or solid medium. Nanoparticle colloid is obtained by the nano-dispersion method of hardly-soluble organic substance.COPYRIGHT: (C)2014,JPO&INPIT【課題】優れた分散安定性及び保存安定性を持ち、かつ、不純物を含まない高純度の難溶性有機物質のナノ粒子コロイドを提供できる技術の構築。元の難溶性有機物質の構造を保持して当該有機物質の溶解液等よりも活性や反応性等の機能が向上したナノ粒子コロイドを提供できる技術の構築。含有ナノ粒子が、高い表面修飾能を有するナノ粒子コロイドを提供できる技術の構築。【解決手段】難溶性有機物質のナノ分散方法であって、液体又は固体の媒体中で前記難溶性有機物質に超短パルスレーザー光を照射してレーザーアブレーションすることにより前記難溶性有機物質をナノ粒子に微細化し、液体又は固体の媒体中に前記ナノ粒子を分散させる、難溶性有機物質のナノ分散方法、及び難溶性有機物質のナノ分散方法によって得られたナノ粒子コロイド。【選択図】図2
