{"id":1321,"date":"2025-04-11T13:51:09","date_gmt":"2025-04-11T04:51:09","guid":{"rendered":"https:\/\/www.sawada.phys.waseda.ac.jp\/?page_id=1321"},"modified":"2026-05-12T16:17:59","modified_gmt":"2026-05-12T07:17:59","slug":"%e3%83%a1%e3%83%b3%e3%83%90%e3%83%bc%ef%bd%9c%e6%b9%af%e6%be%a4%e5%ba%83%e8%bc%9d","status":"publish","type":"page","link":"https:\/\/www.sawada.phys.waseda.ac.jp\/?page_id=1321","title":{"rendered":"\u30e1\u30f3\u30d0\u30fc\uff5c\u6e6f\u6fa4\u5e83\u8f1d"},"content":{"rendered":"\n<p>\u8fd1\u5e74\uff0c\u96fb\u6c17\u3092\u7528\u3044\u305a\u306b\u99c6\u52d5\u3059\u308b\u52d5\u529b\u6e90\u3068\u3057\u3066\u81ea\u8d70\u6db2\u6ef4\u304c\u6ce8\u76ee\u3055\u308c\u3066\u304a\u308a\uff0c\u30c9\u30e9\u30c3\u30b0\u30c7\u30ea\u30d0\u30ea\u30fc\u30b7\u30b9\u30c6\u30e0\u7b49\u3078\u306e\u5fdc\u7528\u304c\u671f\u5f85\u3055\u308c\u3066\u3044\u308b\uff0e\u3057\u304b\u3057\uff0c\u5b9f\u7528\u5316\u306e\u305f\u3081\u306b\u306f\u81ea\u8d70\u73fe\u8c61\u306e\u7cbe\u5bc6\u306a\u5236\u5fa1\u304c\u4e0d\u53ef\u6b20\u3067\u3042\u308b\u4e00\u65b9\uff0c\u73fe\u72b6\u3067\u306f\u6cb9\u6ef4\u306e\u81ea\u8d70\u65b9\u5411\u304c\u30e9\u30f3\u30c0\u30e0\u3067\u3042\u308a\u5fdc\u7528\u5c55\u958b\u306f\u56f0\u96e3\u3067\u3042\u308b\uff0e \u3000\u305d\u3053\u3067\u672c\u7814\u7a76\u3067\u306f\uff0c\u672a\u3060\u5b9f\u73fe\u3055\u308c\u3066\u3044\u306a\u3044\u81ea\u8d70\u6db2\u6ef4\u306e\u8907\u96d1\u306a\u8ecc\u9053\u5236\u5fa1\u3092\u76ee\u7684\u3068\u3059\u308b\uff0e\u6c34\u306b\u901f\u3084\u304b\u306b\u6eb6\u89e3\u3059\u308b\u5c3f\u7d20\u3092\u7528\u3044\u305f\u5916\u9aa8\u683c\u3092\u4f5c\u88fd\u3057\uff0c\u5c3f\u7d20\u6eb6\u89e3\u304c\u6db2\u6ef4\u5185\u90e8\u5bfe\u6d41\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u304c\u5c0f\u3055\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3068\u3068\u3082\u306b\uff0c\u5916\u9aa8\u683c\u5f62\u72b6\u306e\u6642\u9593\u5909\u5316\u306b\u3088\u308b\u81ea\u8d70\u8ecc\u9053\u306e\u591a\u6bb5\u968e\u5909\u66f4\u3092\u5b9f\u73fe\u3059\u308b\uff0e<\/p>\n\n\n\n<p>In recent years, self-propelled droplets have attracted attention as power sources that operate without electricity, and their application to drug delivery systems and related technologies is expected. However, precise control of the self-propulsion phenomenon is indispensable for practical applications, while the propulsion direction of oil droplets is currently random, making practical implementation difficult.<br>Therefore, this study aims to achieve complex trajectory control of self-propelled droplets, which has not yet been realized. An exoskeleton composed of urea, which rapidly dissolves in water, is fabricated, and it is confirmed that the dissolution of urea has only a small effect on the internal convection of the droplet. Furthermore, multistage switching of the self-propelled trajectory is achieved through time-dependent changes in the geometry of the exoskeleton.<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/www.sawada.phys.waseda.ac.jp\/wp-content\/uploads\/Movie-S1.mp4\"><\/video><\/figure>\n\n\n\n<figure class=\"wp-block-video\"><\/figure>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/www.sawada.phys.waseda.ac.jp\/wp-content\/uploads\/FMgPe2fQjEhz3krWwEYRbYh7S1f_Q5HKE_vezYEqSIM.mov\"><\/video><\/figure>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/www.sawada.phys.waseda.ac.jp\/wp-content\/uploads\/KI9wId5jd9WN-SBjrE8SDSj26iiLH6EdOZXF7akedJU.mov\"><\/video><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd1\u5e74\uff0c\u96fb\u6c17\u3092\u7528\u3044\u305a\u306b\u99c6\u52d5\u3059\u308b\u52d5\u529b\u6e90\u3068\u3057\u3066\u81ea\u8d70\u6db2\u6ef4\u304c\u6ce8\u76ee\u3055\u308c\u3066\u304a\u308a\uff0c\u30c9\u30e9\u30c3\u30b0\u30c7\u30ea\u30d0&#8230; <a class=\"more-link\" href=\"https:\/\/www.sawada.phys.waseda.ac.jp\/?page_id=1321\">Continue Reading &rarr;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=\/wp\/v2\/pages\/1321"}],"collection":[{"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1321"}],"version-history":[{"count":4,"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=\/wp\/v2\/pages\/1321\/revisions"}],"predecessor-version":[{"id":1477,"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=\/wp\/v2\/pages\/1321\/revisions\/1477"}],"wp:attachment":[{"href":"https:\/\/www.sawada.phys.waseda.ac.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}