{"id":29899,"date":"2018-06-14T09:54:12","date_gmt":"2018-06-14T07:54:12","guid":{"rendered":"https:\/\/objectif-lune.ch\/?page_id=29899"},"modified":"2024-11-16T21:56:29","modified_gmt":"2024-11-16T20:56:29","slug":"nos-astuces","status":"publish","type":"page","link":"https:\/\/conservation-science.ch\/?page_id=29899","title":{"rendered":"Nos astuces"},"content":{"rendered":"

Comment savoir si un traitement de surface forme un film non poreux ou s’il hydrofuge \u00ab\u00a0seulement\u00a0\u00bb les surfaces sans boucher les pores : test \u00e0 la goutte, 2\u00e8me partie<\/strong>
\nParmi les traitements de surface qui rendent les mat\u00e9riaux hydrophobes il peut \u00eatre utile de savoir reconna\u00eetre ceux qui forment un film \u00e9tanche non poreux de ceux qui, sans boucher les pores, forment des couches mol\u00e9culaires tr\u00e8s fines mais hydrophobes sur les particules solides du mat\u00e9riau.
\nEn g\u00e9n\u00e9ral, les substances hydrophobes \u00ab\u00a0aiment\u00a0\u00bb les solvants organiques : pratiquement, si une goutte de solvant organique est d\u00e9pos\u00e9e sur un mat\u00e9riau hydrophobe mais poreux, elle va p\u00e9n\u00e9trer par capillarit\u00e9 dans la porosit\u00e9.
\nPour d\u00e9terminer si une surface hydrophobe est encore poreuse ou non, il suffira donc de compl\u00e9ter le test \u00e0 la goutte d’eau d\u00e9crit dans l’astuce pr\u00e9c\u00e9dente par le test \u00e0 la goutte d’\u00e9thanol d\u00e9crit ci-apr\u00e8s.<\/p>\n

1 – Test \u00e0 la goutte d’eau : v\u00e9rifiez si le mat\u00e9riau est hydrophobe <\/strong>en suivant les \u00e9tapes 1 et 2 de l’astuce pr\u00e9c\u00e9dente (surface hydrofug\u00e9e ?<\/a>)<\/p>\n

 <\/p>\n\n\n\n
\"\"
\nsurface tr\u00e8s hydrophobe<\/td>\n		\"\"
\nsurface l\u00e9g\u00e8rement moins hydrophobe<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2 – Test \u00e0 la goutte d’\u00e9thanol : v\u00e9rifiez si la surface hydrophobe est poreuse ou non<\/strong>
\namenez d\u00e9licatement en contact une petite goutte d’\u00e9thanol avec la surface du mat\u00e9riau \u00e0 tester<\/p>\n\n\n\n
\"\"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3 – Lecture du r\u00e9sultat<\/strong>
\n– la goutte d’\u00e9thanol mouille le mat\u00e9riau tout en \u00e9tant absorb\u00e9e par capillarit\u00e9 si la surface est encore poreuse (a) ;
\n– si la porosit\u00e9 de surface du mat\u00e9riau est bouch\u00e9e, la goutte d’\u00e9thanol mouille la surface et s’y \u00e9tale simplement, sans \u00eatre absorb\u00e9e (b). Elle dispara\u00eet par \u00e9vaporation avec le temps (attention s’il fait tr\u00e8s chaud ou s’il y a beaucoup de vent le s\u00e9chage sera tr\u00e8s rapide).<\/p>\n\n\n\n
\"\"
\n(a) mat\u00e9riau hydrophobe,
\nporeux<\/td>\n		\"\"
\n(b) mat\u00e9riau hydrophobe
\net non poreux<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Test \u00e0 la goutte, suite :<\/span> <\/strong>dans notre prochaine astuce nous expliquerons comment reconna\u00eetre les anciens traitements de surfaces hydrofuges <\/em><\/p>\n

pour nos astuces archiv\u00e9es…<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Comment savoir si un traitement de surface forme un film non poreux ou s’il hydrofuge \u00ab\u00a0seulement\u00a0\u00bb les surfaces sans boucher les pores : test \u00e0 la goutte, 2\u00e8me partie Parmi les traitements de surface qui rendent les mat\u00e9riaux hydrophobes il peut \u00eatre utile de savoir reconna\u00eetre ceux qui forment un film \u00e9tanche non poreux de … Continuer la lecture de Nos astuces<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":28756,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-29899","page","type-page","status-publish","hentry"],"yoast_head":"\nNos astuces - Bl\u00e4uer - Conservation - Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/conservation-science.ch\/?page_id=29899\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nos astuces - 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