{"id":3169,"date":"2023-05-21T13:55:00","date_gmt":"2023-05-21T04:55:00","guid":{"rendered":"http:\/\/tuat-chemphys.net\/?p=3169"},"modified":"2023-05-21T13:55:00","modified_gmt":"2023-05-21T04:55:00","slug":"%e6%b0%b4%e3%81%ae%e8%92%b8%e7%99%ba%e3%81%af%e5%b0%91%e9%87%8f%e3%81%ae%e3%83%9d%e3%83%aa%e3%83%9e%e3%83%bc%e6%b7%bb%e5%8a%a0%e3%81%a7%e9%98%bb%e5%ae%b3%e3%81%95%e3%82%8c%e3%82%8b-adding-a-polymer-si","status":"publish","type":"post","link":"https:\/\/tuat-chemphys.net\/?p=3169","title":{"rendered":"\u6c34\u306e\u84b8\u767a\u306f\u5c11\u91cf\u306e\u30dd\u30ea\u30de\u30fc\u6dfb\u52a0\u3067\u963b\u5bb3\u3055\u308c\u308b Adding a polymer significantly reduces the rate of water evaporation from narrow gaps"},"content":{"rendered":"\n

(From Inasawa Lab) \u6db2\u4f53\u306e\u308a\u3068\u3057\u3066\u3082\u4f7f\u308f\u308c\u3066\u3044\u308b\u9ad8\u5206\u5b50\uff08\u30dd\u30ea\u30de\u30fc\uff09\u3092\u6dfb\u52a0\u3059\u308b\u3068\u3001\u6c34\u304c\u72ed\u3044\u9699\u9593\u304b\u3089\u84b8\u767a\u3059\u308b\u901f\u5ea6\u3092\u8457\u3057\u304f\u4f4e\u4e0b\u3055\u305b\u308b\u3053\u3068\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3057\u305f\u3002\u69d8\u3005\u306a\u3082\u306e\u3065\u304f\u308a\u3067\u7528\u3044\u3089\u308c\u308b\u56fa\u4f53\u7c92\u5b50\u3068\u30dd\u30ea\u30de\u30fc\u3092\u540c\u6642\u306b\u6df7\u305c\u305f\u5206\u6563\u6db2\u306e\u4e7e\u71e5\u3067\u306f\u3001\u7c92\u5b50\u9593\u306e\u72ed\u3044\u7a7a\u9699\u304b\u3089\u6c34\u304c\u84b8\u767a\u3057\u307e\u3059\u3002\u3053\u306e\u6210\u679c\u306f\u4e7e\u71e5\u5de5\u7a0b\u3067\u306e\u7c92\u5b50\u819c\u5f62\u6210\u306e\u5236\u5fa1\u306b\u5f79\u7acb\u3064\u3053\u3068\u304c\u671f\u5f85\u3055\u308c\u307e\u3059\u3002Adding a polymer (high molecular weight) used as a liquid adhesive significantly reduces the rate of water evaporation from narrow gaps. In the drying of a dispersion in which solid particles and polymers used in various manufacturing processes are mixed simultaneously, water evaporates from narrow gaps between particles. This achievement is expected to be useful for controlling particle film formation during drying processes.<\/p>\n\n\n\n

Colloids and Surfaces A: Physicochemical and Engineering Aspects https:\/\/doi.org\/10.1016\/j.colsurfa.2023.131693<\/a><\/em><\/p>\n\n\n\n


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\u3000\u76f4\u5f84110 nm\u306e\u30b7\u30ea\u30ab\uff08SiO2\uff09\u7c92\u5b50\u304c\u5206\u6563\u3057\u305f\u6c34\u6eb6\u6db2\u306b\u5c11\u91cf\uff08\u4f53\u7a4d\u5206\u7387\u30671%\u672a\u6e80\uff09\u306e\u30dd\u30ea\u30de\u30fc\uff08\u30dd\u30ea\u30d3\u30cb\u30eb\u30a2\u30eb\u30b3\u30fc\u30eb\u3092\u6dfb\u52a0\u3057\u4e7e\u71e5\u3055\u305b\u308b\u3068\u3001\u6c34\u306e\u84b8\u767a\u901f\u5ea6\u306f\u6642\u9593\u306e\u7d4c\u904e\u3068\u3068\u3082\u306b\u521d\u671f\u306e1\/10\u7a0b\u5ea6\u307e\u3067\u4e0b\u304c\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u5bfe\u3057\u3001\u30dd\u30ea\u30de\u30fc\u3092\u6dfb\u52a0\u3057\u306a\u3044\u7c92\u5b50\u5206\u6563\u6db2\u3067\u306f\u84b8\u767a\u901f\u5ea6\u306f\u307b\u3068\u3093\u3069\u5909\u308f\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u4e7e\u71e5\u6761\u4ef6\u3092\u5909\u3048\u3066\u3001\u2460\u30dd\u30ea\u30de\u30fc\u6c34\u6eb6\u6db2\uff08\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u306a\u3057)\u3001\u2461\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5206\u6563\u6db2(\u30dd\u30ea\u30de\u30fc\u306a\u3057)\u304a\u3088\u3073\u2462\u30dd\u30ea\u30de\u30fc\u6dfb\u52a0\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5206\u6563\u6db2\u306e\u84b8\u767a\u901f\u5ea6\u3092\u6bd4\u8f03\u3059\u308b\u3068\u3001\u2462\u306e\u307f\u660e\u78ba\u306b\u84b8\u767a\u901f\u5ea6\u304c\u4f4e\u4e0b\u3059\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u3068\u30dd\u30ea\u30de\u30fc\u304c\u5171\u5b58\u3059\u308b\u3053\u3068\u3067\u3001\u6c34\u306e\u84b8\u767a\u304c\u8457\u3057\u304f\u963b\u5bb3\u3055\u308c\u308b\u3053\u3068\u3092\u793a\u3059\u7d50\u679c\u3067\u3059\u3002<\/p>\n\n\n\n

When fine solid particles (colloidal particles) with a diameter of about 100 nm (one ten-thousandth of 1 mm) that are suspended in water without dissolving are filled by water evaporation, etc., gaps of about 10 nm occur between the particles, and water evaporates further from these gaps. In familiar examples, when water is sprinkled on sand or soil, the scattered sand grains or soil clump together. This is similar to the evaporation of water from the small gaps between the clumped sand grains or soil particles. In manufacturing, even smaller particles than sand or soil particles are frequently used. There are several research examples on how water evaporates from these extremely narrow gaps. However, in manufacturing, solutions containing various other components such as polymers are often used in addition to solid particles, and there have been no studies on how substances that dissolve in water affect the evaporation of water from narrow gaps between particles.<\/p>\n\n\n\n

When a small amount (less than 1% by volume) of polymer (polyvinyl alcohol) was added to a water solution in which silica (SiO2) particles with a diameter of 110 nm were dispersed and dried, the rate of water evaporation decreased to about one-tenth of the initial rate over time. In contrast, the rate of evaporation did not change significantly in particle dispersion without polymer added. When comparing the rate of evaporation under different drying conditions for (1) polymer solution (no colloidal particles), (2) colloidal particle dispersion (no polymer), and (3) polymer-added colloidal particle dispersion, it was found that only (3) clearly reduced the rate of evaporation. This result shows that the coexistence of colloidal particles and polymers significantly inhibits water evaporation.<\/p>\n\n\n\n

\"\"
\uff08\u5de6\uff09\u30dd\u30ea\u30de\u30fc\u3092\u6dfb\u52a0\u3057\u305f\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5206\u6563\u6db2\u306e\u84b8\u767a\u901f\u5ea6\u3002\u9752\u3001\u8d64\u3001\u7dd1\u306e\u8272\u306f\u3001\u6dfb\u52a0\u3057\u305f\u30dd\u30ea\u30de\u30fc\u306e\u5206\u5b50\u91cf\u304c\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u3002\u307e\u305f\u3001\u25cb\u3001\u25c7\u3001\u25b3\u306f\u305d\u308c\u305e\u308c\u6dfb\u52a0\u3057\u305f\u30dd\u30ea\u30de\u30fc\u6fc3\u5ea6\u304c\u7570\u306a\u308b\u3053\u3068\u3092\u793a\u3059\u3002\u00d7\u304c\u30dd\u30ea\u30de\u30fc\u6dfb\u52a0\u306a\u3057\u306e\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5206\u6563\u6db2\u306e\u84b8\u767a\u901f\u5ea6\u3002\uff08\u53f3)\u25cb\uff1a\u30dd\u30ea\u30de\u30fc\u6c34\u6eb6\u6db2\uff08\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u306a\u3057)\u3001\u25c7\uff1a\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5206\u6563\u6db2\uff08\u30dd\u30ea\u30de\u30fc\u6dfb\u52a0\u306a\u3057)\u3001\u25b3\uff1a\u30dd\u30ea\u30de\u30fc\u3092\u6dfb\u52a0\u3057\u305f\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5206\u6563\u6db2\u3001\u306e\u84b8\u767a\u901f\u5ea6\u3002\u56f3\u306e\u53f3\u306b\u884c\u304f\u306b\u5f93\u3063\u3066\u3001\u4e7e\u71e5\u304c\u9032\u3093\u3067\u3044\u308b\u3053\u3068\u306b\u5bfe\u5fdc\u3059\u308b\u3002\u5de6\u30b0\u30e9\u30d5\u4e2d\u306e\u753b\u50cf\u306f\u3001\u5b9f\u969b\u306b\u5145\u586b\u3055\u308c\u305f\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u306e\u96fb\u5b50\u9855\u5fae\u93e1\u50cf\u3002\u7c92\u5b50\uff11\u500b\u306e\u76f4\u5f84\u306f110 nm\u3002(Left) Evaporation rate of colloidal particle dispersion with added polymer. The blue, red, and green colors indicate that the molecular weight of the added polymer is different. The circle, diamond, and triangle indicate that the concentration of the added polymer is different. The evaporation rate of the colloidal particle dispersion without polymer added is shown by x. (Right) Evaporation rate of (1) polymer solution (no colloidal particles), (2) colloidal particle dispersion (no polymer), and (3) \u2462 polymer-added colloidal particle dispersion. Going to the right side of the figure corresponds to the progress of drying. The image in the left graph shows an electron microscope image of the actually filled colloidal particles. The diameter of one particle is 110 nm.<\/figcaption><\/figure>\n\n\n\n

\u30142023\u5e746\u67089\u65e5\u30ea\u30ea\u30fc\u30b9\u3015\u72ed\u3044\u9699\u9593\u304b\u3089\u306e\u6c34\u306e\u84b8\u767a\u306f\u3001 \u5c11\u91cf\u306e\u30dd\u30ea\u30de\u30fc\u6dfb\u52a0\u3067\u963b\u5bb3\u3055\u308c\u308b | 2023\u5e74\u5ea6 \u30d7\u30ec\u30b9\u30ea\u30ea\u30fc\u30b9\u4e00\u89a7 | \u30d7\u30ec\u30b9\u30ea\u30ea\u30fc\u30b9 | \u5e83\u5831\u30fb\u793e\u4f1a\u9023\u643a | \u5927\u5b66\u6848\u5185 | \u56fd\u7acb\u5927\u5b66\u6cd5\u4eba \u6771\u4eac\u8fb2\u5de5\u5927\u5b66 (tuat.ac.jp)<\/a><\/p>\n\n\n\n

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There have been no studies on how substances that dissolve in water affect the evaporation of water from narrow gaps between particles. \u6c34\u306b\u6eb6\u3051\u3066\u3044\u308b\u7269\u8cea\u304c\u3001\u7c92\u5b50\u9593\u306e\u72ed\u3044\u9699\u9593\u304b\u3089\u6c34\u304c\u84b8\u767a\u3059\u308b\u969b\u306b\u3069\u306e\u7a0b\u5ea6\u5f71\u97ff\u3059\u308b\u306e\u304b\u306b\u3064\u3044\u3066\u306f\u691c\u8a0e\u4f8b\u304c\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n","protected":false},"author":3,"featured_media":3171,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[9],"tags":[13],"class_list":["post-3169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-eco-friendly-systems"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/tuat-chemphys.net\/wp-content\/uploads\/2023\/06\/3b8b02e1-e37b-41be-a81a-2b0b39bec3a4.png?fit=1024%2C1024&ssl=1","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":7493,"url":"https:\/\/tuat-chemphys.net\/?p=7493","url_meta":{"origin":3169,"position":0},"title":"\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u3092\u542b\u3080\u9ad8\u5206\u5b50\u6eb6\u6db2\u306f\u3001\u4e7e\u71e5\u4e2d\u306b\u3069\u3046\u5909\u5316\u3059\u308b\u306e\u304b\uff1fUnderstanding Drying-Rate Changes in Polymer Solutions with Colloidal Particles","author":"unet","date":"2026-02","format":false,"excerpt":"\u30b3\u30ed\u30a4\u30c9\u7c92\u5b50\u5165\u308a\u9ad8\u5206\u5b50\u6eb6\u6db2\u306f\u3001\u306a\u305c\u4e7e\u71e5\u304c\u65e9\u304f\u9045\u304f\u306a\u308b\uff1f \u305d\u306e\u201c\u81e8\u754c\u91cf\u201d\u3068\u666e\u904d\u7684\u3075\u308b\u307e\u3044\u3092\u89e3\u660e\uff01Why do polymer solutions with colloids dry differently? 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