N'chifukwa chiyani kuwonjezeka kwa surfactant ndende kumayambitsa kupanga thovu kwambiri?

Mpweya ukalowa m'madzi, popeza susungunuka m'madzi, umagawanika kukhala thovu zambiri ndi madziwo pansi pa mphamvu yakunja, kupanga dongosolo losasinthika. Mpweya ukalowa mumadzimadzi ndikupanga thovu, malo olumikizana pakati pa gasi ndi madzi amawonjezeka, ndipo mphamvu yaulere yadongosolo imakweranso molingana.

Mfundo yotsika kwambiri imagwirizana ndi zomwe timakonda kuzitcha kuti ma critical micelle concentration (CMC). Choncho, pamene surfactant ndende ukufika CMC, pali okwanira mamolekyu surfactant mu dongosolo kuti kuli agwirizane pa madzi pamwamba, kupanga kusiyana wopanda monomolecular filimu wosanjikiza. Izi zimachepetsa kugwedezeka kwapamtunda kwa dongosolo. Pamene kukangana pamwamba kumachepa, mphamvu yaulere yofunikira pakupanga chithovu m'dongosolo imachepetsanso, kupanga kupanga chithovu kukhala kosavuta.

Pakupanga ndi kugwiritsa ntchito, kuonetsetsa kukhazikika kwa ma emulsion okonzeka panthawi yosungira, ndende ya surfactant nthawi zambiri imasinthidwa pamwamba pa ndende yovuta ya micelle. Ngakhale izi zimawonjezera kukhazikika kwa emulsion, zimakhalanso ndi zovuta zina. Owonjezera surfactants osati kuchepetsa dongosolo padziko mavuto komanso kuphimba mpweya kulowa emulsion, kupanga ndi okhwima madzi filimu, ndi pa madzi pamwamba, bilayer maselo filimu. Izi zimalepheretsa kwambiri kugwa kwa thovu.

Chithovu ndi kusonkhanitsa kwa thovu zambiri, pamene kuwira kumachitika pamene gasi amwaza mu madzi—gasi monga gawo lomwazikana ndi madzi monga gawo lopitirira. Mpweya womwe uli mkati mwa thovuli ukhoza kusuntha kuchoka ku thovu lina kupita ku lina kapena kuthawira mumlengalenga wozungulira, zomwe zimapangitsa kuti kuwirako kuphatikizidwe ndikuzimiririka.

Kwa madzi oyera kapena ma surfactants okha, chifukwa cha mawonekedwe awo ofanana, filimu ya thovu yomwe imatuluka imakhala yopanda kukhazikika, kupangitsa thovu kukhala losakhazikika komanso losavuta kudzichotsa. Chiphunzitso cha Thermodynamic chimasonyeza kuti chithovu chopangidwa muzamadzimadzi choyera ndi chosakhalitsa ndipo chimatha chifukwa cha ngalande za filimu.

Monga tanena kale, mu zokutira zokhala ndi madzi, kuwonjezera pa dispersion sing'anga (madzi), palinso emulsifiers for polima emulsification, pamodzi dispersants, wetting agents, thickeners, ndi zina surfactant-based ❖ kuyanika zowonjezera. Popeza kuti zinthuzi zimakhalira limodzi m'dongosolo lomwelo, kupangika kwa thovu ndikotheka kwambiri, ndipo zigawo zonga ngati surfactant zimathandizira kukhazikika kwa thovu lopangidwa.

Pamene ma ionic surfactants amagwiritsidwa ntchito ngati emulsifiers, filimuyi imakhala ndi magetsi. Chifukwa cha kukanidwa kwakukulu pakati pa milandu, thovu limakana kuphatikizika, kupondereza njira ya tinthu tating'onoting'ono tophatikizana kukhala zazikulu ndikugwa. Chifukwa chake, izi zimalepheretsa kuchotsedwa kwa thovu ndikukhazikika kwa thovu.

Lumikizanani nafe!