Qhov sib txawv tseem ceeb ntawm micelles thiab colloidal hais yog tias micelles tsim ntawm ib qho concentration whereas colloidal particles tsim sai li sai tau raws li cov kuab tshuaj ntxiv rau cov kuab tshuaj.
Cov ntsiab lus micelles thiab colloidal hais los hauv kev tshuaj ntsuam chemistry qhov twg colloids tau tham. Micelles kuj yog ib hom colloidal hais.
Micelles yog dab tsi?
Micelles yog colloidal particles uas tsim los ua ib pawg ntawm surfactant molecules. Cov no tau tawg mus rau hauv cov kua nruab nrab thiab tshwm sim raws li cov kua colloids. Surfactant molecules muaj lub taub hau hydrophilic thiab hydrophobic tails. Nyob rau hauv ib qho nruab nrab aqueous, hydrophobic ib tus Tsov tus tw qauv zoo li tua cov dej molecules thaum lub taub hau hydrophilic nyiam nyiam cov dej molecules. Raws li qhov tshwm sim, cov ntaub ntawv sib sau ua ke hauv txoj hauv kev uas lub taub hau hydrophilic nyob rau hauv kev sib cuag nrog cov kuab tshuaj, nyob ib puag ncig cov tails hydrophobic hauv micelle.
Daim duab 01: Cov qauv ntawm ib hom Micele
Micelles yog spherical nyob rau hauv lawv cov duab. Tsis tas li ntawd, qee cov duab xws li ellipsoids, cylindrical structures, thiab bilayers kuj ua tau. Cov duab ntawm micelle yog txiav txim siab los ntawm qee yam xws li cov duab molecular geometry ntawm surfactant molecule, surfactant concentration nyob rau hauv cov tshuaj, kub, pH, thiab lub zog ionic. Cov txheej txheem ntawm kev tsim micelle hu ua micellisation.
Ntxiv mus, micelles tsim thaum cov concentration ntawm cov surfactant ntau dua qhov tseem ceeb micelle concentration ntawm cov tshuaj. Tsis tas li ntawd, qhov kub ntawm qhov system yuav tsum siab tshaj qhov tseem ceeb micelle kub. Feem ntau, micelles tsim spontaneously vim qhov sib npaug ntawm entropy thiab enthalpy ntawm surfactant-solvent sib tov.
Dab tsi yog Colloidal Particles?
Colloidal particles yog cov khoom uas tau tawg mus rau hauv kev ncua. Hom suspension no hu ua colloidal suspension. Cov khoom uas raug tshem tawm tuaj yeem yog soluble lossis insoluble hais. Ib qho colloid muaj ob theem sib txawv ntawm cov teeb meem: kua theem hnyav thiab cov khoom theem hais. Cov theem ua kua yog hu ua ntu txuas ntxiv, thiab cov theem khoom yog hu ua dispersed theem, uas yog dispersed thoob plaws hauv cov kuab tshuaj. Feem ntau, cov khoom colloidal tsis khom lossis siv sijhawm ntev heev los khom.
Daim duab 02: Hauv mis nyuj, Colloidal Particles yog Butterfat Globules
Colloidal hais tau yooj yim pom los ntawm lub tshuab ntsuas qhov muag. Qee cov colloids yog opaque, tab sis qee qhov yog translucent. Translucent xwm yog vim Tyndall nyhuv ntawm lub teeb tawg. Muaj ntau ntau hom colloids, nyob ntawm seb hom kua theem thiab dispersed theem. Cov hauv qab no yog qee qhov piv txwv.
- Yog tias cov kuab tshuaj yog kua thiab tawg theem yog roj, peb hu ua cov npuas dej colloid. Cov colloidal hais yog gaseous aggregates. E.g. whipped cream.
- Yog tias cov kuab tshuaj yog cov khoom tawg thiab tawg yog cov roj, ces peb hu nws ua npuas ncauj. Ntawm no kuj, cov colloidal hais yog gaseous aggregates. E.g. aerogel.
- Yog tias cov theem hnyav yog roj thiab cov theem dispersed yog kua, peb hu ua kua aerosol. Cov colloidal hais yog kua aggregates. E.g. tshuaj tsuag.
- Yog tias cov theem hnyav yog kua thiab cov theem tawg kuj yog kua, peb hu nws ua emulsion. E.g. tej.
- Yog tias cov theem hnyav yog cov khoom thiab cov theem dispersed yog kua, peb hu ua gel. Cov colloidal hais ntawm no yog kua aggregates. E.g. agar.
- Yog tias cov theem hnyav yog roj thiab cov theem tawg yog cov khoom, peb hu nws cov khoom aerosol. E.g. haus luam yeeb.
- Yog tias cov theem hnyav yog kua thiab cov theem tawg yog cov khoom, peb hu nws ua "sol". Cov colloidal hais ntawm no yog cov khoom sib sau ua ke. E.g. ntshav.
- Yog hais tias cov kuab tshuaj theem yog khoom thiab dispersed nruab nrab kuj yog khoom, peb hu nws cov khoom sol. Cov colloidal hais ntawm no yog cov khoom sib sau ua ke. E.g. cranberry iav.
Qhov txawv ntawm Micelles thiab Colloidal Particles yog dab tsi?
Micelles kuj yog hom colloidal hais. Qhov sib txawv tseem ceeb ntawm micelles thiab colloidal hais yog tias micelles tsim ntawm ib qho kev concentration thaum colloidal particles tsim sai li sai tau thaum cov tshuaj ntxiv rau cov kuab tshuaj. Tsis tas li ntawd, micelles tsim los ntawm hydrophilic thiab hydrophobic teebmeem thaum colloidal particles tsim vim insolubility los yog saturation ntawm cov tshuaj.
Ntxiv mus, qhov loj ntawm micelles tuaj yeem sib txawv ntawm 2 txog 20 nanometers thaum qhov loj ntawm colloidal hais tuaj yeem sib txawv ntawm 1 txog 1000 nanometers.
Cov ntawv qhia hauv qab no qhia ntau qhov sib piv ntsig txog qhov sib txawv ntawm micelles thiab colloidal hais.
Summary – Micelles vs Colloidal Particles
Cov ntsiab lus micelles thiab colloidal hais los hauv kev tshuaj ntsuam chemistry qhov twg colloids tau tham. Micelles kuj yog ib hom colloidal hais. Qhov sib txawv tseem ceeb ntawm micelles thiab colloidal hais yog tias micelles tsim ntawm ib qho kev concentration thaum colloidal particles tsim sai li sai tau thaum cov tshuaj ntxiv rau cov kuab tshuaj.
