Qhov sib txawv tseem ceeb ntawm tus neeg sawv cev ncua thiab tus neeg sawv cev emulsifying yog tias cov neeg ua haujlwm tshem tawm yog qhov muaj txiaj ntsig zoo rau kev ruaj ntseg ntawm kev ncua, qhov emulsifying cov neeg ua haujlwm muaj txiaj ntsig zoo hauv stabilizing emulsions.
Kev ncua thiab emulsions yog ob yam khoom sib txawv. Ib qho emulsion feem ntau yog sib xyaw ntawm ob lub kua, thaum lub sijhawm ncua sij hawm tuaj yeem yog qhov sib xyaw ntawm ob yam khoom los ntawm txhua theem (gas, kua lossis khoom). Txawm li cas los xij, ob qho tib si yog qhov sib xyaw ntawm ob lub ntsiab lus.
Tus Neeg Saib Xyuas Kev Ncua Dab Tsi yog dab tsi?
Cov tshuaj tua kab mob yog cov tshuaj lom neeg muaj txiaj ntsig hauv kev ua kom muaj kev ncua. Cov no tseem hu ua thickening agents. Cov no feem ntau yog hydrophilic colloids uas spontaneously tsim colloidal dispersions nrog dej. Qhov no tshwm sim vim muaj kev sib raug zoo ntawm cov khoom tawg thiab cov nruab nrab dispersion. Cov tshuaj no muaj txiaj ntsig zoo hauv kev txo qis cov sedimentation ntawm cov khoom hauv kev ncua.
Feem ntau, cov sedimentation yog qeeb los ntawm kev ncua cov neeg sawv cev los ntawm kev ua kom cov viscosity ntawm lub tsheb ua kua thiab los ntawm kev ua kom qeeb qeeb (raws li txoj cai Stokes). Ntxiv mus, tshem tawm cov neeg ua hauj lwm yuav tiv thaiv caking ntawm lub hauv paus ntawm kev ncua, thiab peb muaj peev xwm resuspend nws los ntawm agitation.
Daim duab 01: Kev daws, Kev ncua, Supernatant, thiab Precipitate
Muaj peb yam loj ntawm cov tshuaj ncua, suav nrog polysaccharides, inorganic ntsev thiab cov khoom siv hluavtaws. Feem ntau cov polysaccharides peb tuaj yeem siv los ua cov tshuaj tshem tawm xws li ntuj polysaccharides xws li acacia, hmoov txhuv nplej siab, alginates, thiab lwm yam. Qee cov piv txwv ntawm cov ntsev inorganic uas peb tuaj yeem siv ua cov tshuaj tshem tawm xws li av nplaum, bentonite, thiab txhuas hydroxide. Synthetic compounds kuj tau ua los ntawm cov neeg ua haujlwm ncua kev txiav txim kom kov yeej ntau yam teeb meem tshwm sim los ntawm cov khoom ntuj tsim. e.g. Carbomers thiab colloidal silicon dioxide.
Tus neeg sawv cev Emulsifying yog dab tsi?
Tus neeg sawv cev emulsifying yog cov tshuaj lom neeg uas tso cai rau peb kom ruaj khov ntawm emulsion. Hauv lwm lo lus, nws tuaj yeem tiv thaiv kev sib cais ntawm cov kua dej uas feem ntau tsis sib xyaw ua ke. Ntxiv mus, emulsifying agents ua li ntawd los ntawm kev ua kom lub kinetic stability ntawm qhov sib tov. Peb tuaj yeem hu rau lawv emulsifiers ib yam nkaus, thiab ib qho piv txwv zoo yog surfactants. Muaj ob hom emulsifiers li lipophilic emulsifiers thiab hydrophilic emulsifiers.
Daim duab 02: Tsim cov emulsion
Lipophilic emulsifiers yog cov emulsifying cov neeg ua haujlwm uas ua haujlwm nrog cov roj emulsions. Cov tshuaj reagents no yog ib qho tseem ceeb hauv kev tshem tawm ib qho penetrant thaum muaj teeb meem vim kev ntxuav ntau dhau ntawm emulsion yog ib qho kev txhawj xeeb. Lipophilic emulsifiers tuaj yeem ua rau cov neeg nkag siab ntau dua tshem tau nrog kev ntxuav siv dej. Feem ntau, lipophilic emulsifiers yog cov khoom siv roj raws li cov khoom siv roj, thiab cov reagents no yog tsim los ua cov neeg ua haujlwm npaj siv los ntawm cov chaw tsim khoom.
Hydrophilic emulsifiers yog emulsifying cov neeg ua haujlwm nrog dej-raws li emulsions. Zoo ib yam li lipophilic emulsifiers, cov tshuaj reagents no kuj tseem ceeb heev rau kev tshem tawm qhov tsis xws luag thaum ntxuav ntau dhau ntawm emulsion yog ib qho kev txhawj xeeb. Ntawm no, lipophilic emulsifiers tuaj yeem ua rau cov neeg nkag siab ntau dua tshem tau nrog kev ntxuav siv dej. Feem ntau, hydrophilic emulsifiers yog cov khoom siv dej thiab yog tsim los ntawm cov chaw tsim khoom. Yog li ntawd, peb yuav tsum tau dilute qhov concentration ntawm hydrophilic emulsifier siv dej mus rau ib tug nyiam concentration ua ntej siv.
Qhov txawv ntawm Tus Neeg Saib Xyuas Kev Ncua Sijhawm thiab emulsifying Agent yog dab tsi?
Kev ncua thiab emulsions yog ob qhov sib txawv. Yog li ntawd, cov tshuaj tshem tawm thiab cov emulsifying agents kuj txawv ntawm ib leeg. Qhov sib txawv tseem ceeb ntawm kev tshem tawm tus neeg sawv cev thiab tus neeg sawv cev emulsifying yog tias cov neeg ua haujlwm tshem tawm muaj txiaj ntsig zoo rau kev ruaj ntseg ntawm kev ncua, qhov emulsifying cov neeg ua haujlwm muaj txiaj ntsig zoo hauv stabilizing emulsions.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm tus neeg sawv cev tshem tawm thiab tus neeg sawv cev emulsifying hauv daim ntawv tabular.
Summary – Suspending Agent vs Emulsifying Agent
Ob qho kev ncua thiab emulsions yog cov khoom sib xyaw ntawm ob yam, tab sis emulsions tseem ceeb yog ua los ntawm ob lub kua, thaum raug tshem tawm tuaj yeem tsim los ntawm cov khoom hauv txhua theem. Yog li ntawd, cov tshuaj stabilizing uas peb yuav tsum siv rau lawv kuj txawv. Qhov sib txawv tseem ceeb ntawm kev tshem tawm tus neeg sawv cev thiab tus neeg sawv cev emulsifying yog tias cov neeg ua haujlwm tshem tawm muaj txiaj ntsig zoo rau kev ruaj ntseg ntawm kev ncua, qhov emulsifying cov neeg ua haujlwm muaj txiaj ntsig zoo hauv stabilizing emulsions.
