Video: Yuav ua li cas kom tsis txhob kuv emulsion ntawm cream?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Rau cov roj-hauv-dej raug emulsion , pleev tuaj yeem tshwm sim tsuas yog tias cov roj me me me dua ~ 1 micron (ntawm qhov taw tes brownian cov lus tsa suab yuav dhau). Yog li ntawd, ib txoj hauv kev rau tiv thaiv cream yog ntxiv cov surfactants uas khaws cov tee dej los ntawm kev sib txuas thiab yog li ntawd me me txaus kom nyob twj ywm tawg.
Kuj nug, yuav ua li cas koj thiaj li tsis txhob cream hauv emulsions?
Rau ib txwm roj-hauv-dej emulsion , creaming tsuas tuaj yeem tshwm sim yog tias cov roj tee me dua li ~ 1 micron (ntawm qhov taw tes brownian motion yuav dhau mus). Yog li ntawd, ib txoj kev mus tiv thaiv cream yog ntxiv cov surfactants uas khaws cov tee dej los ntawm kev sib txuas thiab yog li ntawd me me txaus kom nyob twj ywm tawg.
Ntxiv mus, dab tsi yog cream emulsion? Creaming , hauv kev sim siab, yog kev tsiv teb tsaws chaw ntawm qhov kev faib tawm ntawm ib qho emulsion , nyob rau hauv kev cuam tshuam ntawm ntab. Nyob ntawm seb qhov sib faib sib faib tau tsawg dua lossis ntom ntau dua li cov ntu txuas mus, lawv tuaj yeem txav mus rau saum cov qauv, lossis mus rau hauv qab.
Hais txog qhov no, dab tsi ua rau pleev hauv emulsions?
Creaming feem ntau yog vim qhov sib txawv ntawm qhov sib txawv ntawm ob theem, thiab ntau emulsion qab zib nyob ntev. The disperse phase (feem ntau yog oily) tsawg dua ntais thiab nce mus rau sab saum toj kom tsim ib txheej ntawm ntau qhov kev mloog zoo emulsion . Flocculation yuav tshwm sim ntxiv rau pleev.
Vim li cas kev sib cais theem tshwm sim hauv emulsion?
Lub hauv paus tseem ceeb uas ua rau theem sib cais ntawm emulsions yog droplet coalescence, qhov twg tee merge ua ke kom txo tau tag nrho cov interfacial cheeb tsam tam sim no. Hauv emulsions ruaj khov los ntawm nanoparticles (Pickering emulsions ), droplet coalescence yog tiv thaiv los ntawm nanoparticles daig ntawm cov kua interfaces.
Pom zoo:
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