Emulsion vs Suspension
Kev sib xyaw muaj ob lossis ntau yam tshuaj, uas tsis yog tshuaj sib xyaw ua ke thiab tsuas yog muaj kev cuam tshuam ntawm lub cev. Txij li thaum lawv tsis muaj kev cuam tshuam tshuaj lom neeg, cov khoom siv tshuaj lom neeg ntawm tus kheej cov khoom khaws cia yam tsis muaj kev hloov pauv hauv kev sib xyaw, tab sis lub cev muaj zog xws li melting point, boiling point yuav txawv nyob rau hauv ib tug sib tov piv rau nws tus kheej cov khoom. Yog li ntawd, cov khoom sib xyaw ua ke tuaj yeem sib cais siv cov khoom siv lub cev. Piv txwv li, hexane tuaj yeem sib cais los ntawm kev sib xyaw ntawm hexane thiab dej, vim tias hexane boils thiab evaporates ua ntej dej. Tus nqi ntawm cov tshuaj nyob rau hauv ib tug sib tov yuav txawv, thiab cov nyiaj no tsis muaj ib tug taag ratio. Yog li ntawd, txawm tias ob qho kev sib xyaw uas muaj cov tshuaj zoo sib xws tuaj yeem sib txawv, vim qhov sib txawv ntawm lawv qhov sib xyaw ua ke. Kev daws, alloys, colloids, suspensions yog hom kev sib tov. Kev sib xyaw ua ke tuaj yeem muab faib ua ob qho, xws li homogenous sib xyaw thiab sib xyaw ua ke. Ib homogeneous sib tov yog uniform; Yog li ntawd, cov khoom ntawm tus kheej tsis tuaj yeem raug cais tawm, tab sis qhov sib xyaw ua ke muaj ob lossis ntau theem thiab cov khoom tuaj yeem txheeb xyuas tus kheej.
Nyob zoo Emulsion
Colloidal tov yog pom raws li homogeneous sib tov, tab sis nws tuaj yeem ua heterogeneous zoo li (xws li mis nyuj, roj hauv dej). Emulsion yog ib feem ntawm colloid; Yog li ntawd, nws muaj feem ntau ntawm cov yam ntxwv ntawm ib tug colloid. Cov khoom hauv emulsion yog qhov nruab nrab me me (loj dua li cov molecules) piv rau cov khoom hauv kev daws teeb meem thiab kev ncua. Cov me me los yog cov tee dej no tsis muaj zog hauv qhov xwm txheej. Yog li ntawd, piv rau lwm cov colloids, emulsion txawv vim hais tias cov khoom thiab cov nruab nrab yog ob qho tib si kua. Cov khoom nyob rau hauv ib qho emulsion yog hu ua dispersed khoom, thiab cov dispersing nruab nrab (nruam theem) yog analogous rau cov kuab tshuaj nyob rau hauv ib tug tov. Yog tias ob lub kua sib xyaw ua ke, lub colloid hu ua emulsion tuaj yeem ua rau (xws li mis nyuj). Rau qhov no, ob txoj kev daws teeb meem yuav tsum yog immiscible. Emulsions yog translucent los yog opaque. Lawv cov khoom yog nyob ntawm ntau yam xws li qhov kub thiab txias, qhov loj me, cov xaim xaim, cov khoom tawg, thiab lwm yam. Emulsions tsis tsim ib txwm vim lawv tsis khov. Lawv tsim thaum co, nplawm, lossis sib tov los ntawm txhua txoj kev. Cov tee dej hauv ib qho emulsion tuaj yeem sib sau ua ke thiab tsim cov tee loj dua thaum sib tov zoo li no. Ib qho emulsifier tuaj yeem muab ntxiv rau qhov no txhawm rau txhim kho kev ruaj ntseg. Surfactants tuaj yeem ua raws li emulsifiers yog li, ua kom cov kinetic stability ntawm emulsion.
Txhob Cia Siab
Ncua tseg yog qhov sib xyaw ua ke ntawm cov tshuaj (E.g. dej nyab). Muaj ob yam khoom nyob rau hauv lub ncua kev kawm ntawv, cov khoom dispersed thiab cov dispersion nruab nrab. Muaj cov khoom loj dua (cov khoom siv dispersed) muab faib rau hauv qhov nruab nrab dispersion. Qhov nruab nrab tuaj yeem yog kua, roj lossis khoom. Yog tias qhov kev ncua raug tso cai kom sawv ntsug rau qee lub sijhawm, cov khoom tuaj yeem raug txiav mus rau hauv qab. Los ntawm kev sib xyaw nws, kev ncua tuaj yeem tsim dua. Cov khoom hauv qhov raug ncua yog pom ntawm qhov muag liab qab, thiab los ntawm kev pom, lawv tuaj yeem sib cais. Vim tias cov khoom loj dua, cov kev ncua yuav ua rau tsis pom tseeb thiab tsis pob tshab.
Qhov txawv ntawm Emulsion thiab Suspension yog dab tsi?
• Emulsion yog ib qho ua ke ntawm ob lub kua dej tsis sib haum hos, nyob rau hauv kev ncua, ob yam khoom tuaj yeem ua tau ntawm txhua theem.
• Kev ruaj ntseg ntawm emulsions tuaj yeem nce ntxiv los ntawm kev ntxiv emulsifiers.
• Cov khoom hauv qhov raug tshem tawm tuaj yeem sib cais los ntawm kev lim, tab sis cov khoom / cov dej hauv cov emulsion tsis tuaj yeem sib cais los ntawm kev lim.
