Qhov sib txawv tseem ceeb ntawm microemulsion thiab nanoemulsion yog tias microemulsions yog thermodynamically ruaj khov, whereas nanoemulsions yog thermodynamically tsis ruaj khov.
Microemulsion thiab nanoemulsion yog ob hom emulsion sib txawv. Ib qho emulsion yog ib qho zoo dispersion ntawm feeb ntawm ib cov kua hauv lwm qhov uas nws tsis soluble lossis miscible. Peb tuaj yeem piav qhia txog ib qho emulsion raws li kev sib xyaw ntawm ob cov kua dej uas tsis sib haum nrog ib leeg. Ib qho emulsion yog ib hom colloid. Peb feem ntau nyiam siv ob lo lus emulsion thiab colloid sib hloov, tab sis lub sij hawm emulsion tshwj xeeb piav qhia txog kev sib xyaw ntawm ob cov kua uas tsim cov colloid.
YMicroemulsion yog dab tsi?
Microemulsion yog cov kua ntshiab, ruaj khov isotropic uas muaj cov roj sib xyaw ua ke, dej, thiab surfactant. Nws yog ib qho thermodynamically ruaj khov kua feem ntau muaj cov cosurfactant. Cov theem aqueous ntawm no microemulsion muaj ntsev thiab lwm yam khoom xyaw, whereas roj theem ntawm no microemulsion muaj ib tug complex sib tov ntawm ntau yam hydrocarbon tebchaw. Hauv kev sib piv rau cov emulsions zoo tib yam, cov microemulsions yog tsim los ntawm kev sib xyaw yooj yim ntawm cov khoom. Nyob rau hauv lwm yam lus, nws tsis xav tau siab shear tej yam kev mob uas feem ntau pab tau nyob rau hauv lub tsim ntawm emulsions zoo tib yam. Muaj peb hom microemulsions: ncaj microemulsion, thim rov qab microemulsion, thiab biocontinuous microemulsion.
Daim duab 01: Emulsion
Tsis tas li ntawd, nyob rau hauv lub xub ntiag ntawm aqueous thiab roj theem ntawm microemulsion, cov surfactant molecules nyob rau hauv microemulsion zoo li yuav tsim ib tug monolayer ntawm lub interface ntawm cov roj theem thiab dej theem. Lub surfactant molecule muaj hydrophobic tails uas yog yaj nyob rau hauv cov roj theem. Nws kuj tseem muaj cov pab pawg neeg lub taub hau hydrophilic yaj nyob rau theem aqueous.
Muaj ntau cov ntawv thov tseem ceeb ntawm microemulsions, uas suav nrog cov txheej txheem ntxuav qhuav, txheej txheem polishing hauv pem teb, ua cov tshuaj ntxuav, ua cov khoom xyaw hauv cov khoom tu tus kheej, hauv cov tshuaj tua kab, txiav cov roj, thiab cov khoom hauv qee yam tshuaj.
Nanoemulsion yog dab tsi?
Nanoemulsion tseem hu ua miniemulsion thiab yog qhov tshwj xeeb ntawm emulsion. Hom emulsion no yog tsim thaum shearing ib tug sib tov ntawm ob immiscible kua theem nrog rau ib los yog ntau tshaj surfactants thiab kuj yog ib tug cosurfactant.
Thaum npaj nanoemulsion, peb tuaj yeem siv ob txoj hauv kev: kev siv hluav taws xob siab thiab txoj kev siv hluav taws xob tsawg. Cov txheej txheem siab-zog siv cov txheej txheem ntawm kev raug rau lub zog siab ultrasound ntawm qhov sib tov. Los yog lwm yam, peb tuaj yeem siv lub siab homogenizer. Thaum xav txog qhov tsawg-zog miniemulsion ntau lawm, peb tuaj yeem ua ntej ua dej-roj emulsion uas yog tom qab ntawd hloov mus rau hauv cov roj-hauv-dej miniemulsion los ntawm kev hloov ntawm ob qho tib si ntawm qhov sib xyaw lossis qhov kub ntawm qhov sib tov.
Hauv qhov sib piv rau microemulsions, nanoemulsions yog thermodynamically tsis ruaj khov. Txawm li cas los xij, lawv yog kinetically ruaj khov. Thermodynamical instability tshwm sim vim qhov tseeb tias cov roj thiab dej tsis sib haum xeeb; Yog li ntawd, qhov kev sib tshuam ntawm ob theem no tsis nyiam. Txawm li cas los xij, lub xub ntiag ntawm surfactant thiab cosurfactant tuaj yeem cuam tshuam qhov tseeb. Ntxiv rau qhov ntawd, peb tuaj yeem tau txais cov tee dej ruaj khov uas muaj qhov ntev ntawm 50 txog 500 nm vim muaj cov surfactants.
Qhov txawv ntawm Microemulsion thiab Nanoemulsion yog dab tsi?
Microemulsion yog cov kua ntshiab, ruaj khov isotropic uas muaj cov roj sib xyaw ua ke, dej, thiab surfactant. Nws yog ib qho thermodynamically ruaj khov kua feem ntau muaj cov cosurfactant. Nanoemulsion tseem hu ua miniemulsion thiab yog ib qho tshwj xeeb ntawm emulsion. Qhov sib txawv tseem ceeb ntawm microemulsion thiab nanoemulsion yog tias microemulsions yog thermodynamically ruaj khov, whereas nanoemulsions yog thermodynamically tsis ruaj khov.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm microemulsion thiab nanoemulsion hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Microemulsion vs Nanoemulsion
Microemulsion thiab nanoemulsion yog ob hom emulsion sib txawv. Qhov sib txawv tseem ceeb ntawm microemulsion thiab nanoemulsion yog tias microemulsions yog thermodynamically ruaj khov, whereas nanoemulsions yog thermodynamically tsis ruaj khov.
