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Literaturni pregled pristopov stabilizacije in vrednotenja emulzij, stabiliziranih s trdnimi delci = Literature overview of characteristics and stabilisation approaches of emulsions stabilised with solid particles : univerzitetni študijski program KozmetologijaRednak, SaraPickering emulzije so emulzije, stabilizirane s trdnimi delci, razporejenimi na medfazi olje-voda. Odkrite so bile pred stoletjem, v zadnjih desetletjih pa so postale raziskovalno izredno zanimive. V ... primerjavi s klasičnimi emulzijami so Pickering emulzije stabilnejše, nizko toksične in biološko bolj ugodne, saj so tako površinsko aktivne snovi odsotne ali prisotne v manjših deležih. Znanje o umeščanju delcev na medfazo se vse bolj dopolnjuje, raziskovalci pa iščejo predvsem povezavo med površinskimi značilnostmi delcev in tipom ter stabilnostjo nastale emulzije - stabilizacija emulzije tipa olje v vodi je uspešnejša s hidrofilnejšimi delci, stabilizacija emulzij tipa vode v olju pa s hidrofobnejšimi delci. Trdni delci se ireverzibilno adsorbirajo na medfazo, kar je mogoče zaradi delnega močenja delcev, ki je opredeljeno s stičnim kotom. Na stabilnost vplivajo tudi drugi dejavniki: koncentracija, velikost, oblike in površinske lastnosti delcev, vrsta oljne faze in razmerje med oljno in vodno fazo, medfazna napetost itd. Vsi ti parametri so med seboj povezani in pogosto sprememba enega parametra povzroči spremembe drugih. Pickering emulzije večinoma pripravljajo z visoko strižnimi tehnikami (rotor-stator homogenizator, visokotlačna homogenizacija in ultrazvočno razbijanje) in tehnikami nizkega striga (membransko emulgiranje in mikrofluidna tehnologija). V kozmetični industriji so emulzije eden najpogosteje uporabljenih medijev. Prednosti formulacij, stabiliziranih z delci so: večja stabilnost, boljša permeacija skozi kožo, boljši senzorični učinki, nadzorovano in počasno sproščanje aktivnih učinkovin, boljši reološki profil in trajnost. Stabilnost je mogoče doseči z uporabo različnih snovi, kot so silicijev dioksid, hitosan, celuloza in škrob. Njihove površinske lastnosti je mogoče spremeniti in izboljšati stabilnost, topnost, absorpcijo, reološke lastnosti ter senzorični občutek.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [S. Rednak], 2021Language - slovenianCOBISS.SI-ID - 75958019
Author
Rednak, Sara
Other authors
Planinšek, Odon
Topics
Kozmetična industrija |
Emulzije |
Pickering emulzije |
trdni delci |
stabilizacija |
kozmetika |
stabilnost emulzij |
reološke lastnosti
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Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Pharmacy, Ljubljana | Ljubljana | FFALJ |
reading room 1 cop.
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Rednak, Sara | ![]() |
Planinšek, Odon | 14935 |
Source: Personal bibliographies
and: SICRIS
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