Hauv kev kawm txog chemistry, qee cov organic compounds, vim lawv cov khoom tsis yaj lossis yaj me ntsis hauv dej, coj ntau yam kev tsis yooj yim rau kev siv. Txawm li cas los xij, thaum cov organic compounds no nyob ua ke nrog surfactants, lawv cov solubility nce ntxiv, ib qho xwm txheej hu ua solubilization. Surfactants ua haujlwm ua solubilizers hauv cov txheej txheem no, thaum cov organic compounds uas raug solubilized hu ua solubilizates. Tsab xov xwm no yuav nkag mus rau hauv lub mechanism ntawm solubilization thiab nws cov yam ntxwv cuam tshuam.
1. Mechanism ntawm solubilization
Qhov tshwm sim ntawm kev yaj yog ze rau cov khoom ntawm surfactants. Cov kev sim tau qhia tias thaum qhov concentration ntawm surfactants qis dua qhov tseem ceeb micelle concentration (CMC), qhov solubility ntawm cov organic substances tsis hloov pauv ntau; txawm li cas los xij, thaum qhov concentration ntau dua CMC, qhov solubility nce ntxiv sai heev. Qhov no yog vim tias ntawm qhov concentration no, surfactants pib tsim micelles, thiab solubilization yog ze rau kev tsim micelles.
Nyob ntawm seb qhov chaw ntawm cov tshuaj yaj hauv cov micelle, muaj plaub txoj hauv kev ntawm kev yaj:
① Kev yaj hauv cov micelle: Txoj kev no haum rau cov khoom siv hydrocarbon yooj yim uas tsis yog polar, xws li benzene, ethylbenzene, thiab n-heptane. Lawv yooj yim yaj hauv cov micelle vim tias sab hauv ntawm cov micelle tuaj yeem suav tias yog cov khoom siv hydrocarbon ntshiab, uas muaj cov khoom zoo sib xws rau cov khoom no.
②Kev yaj hauv cov txheej micelle palisade: Rau cov khoom siv polar organic xws li cov cawv ntev thiab cov kua qaub, lawv tau faib ua lwm yam thiab sib luag nrog cov surfactant molecules. Cov khoom tsis yog polar cuam tshuam nrog cov pab pawg hydrophobic ntawm surfactants los ntawm van der Waals rog, thaum cov khoom polar txuas nrog cov pab pawg hydrophilic ntawm surfactants los ntawm van der Waals rog thiab hydrogen bonds.
③Kev yaj ntawm qhov chaw micelle: Cov tshuaj macromolecular, cov xim, thiab lwm yam, yuav raug nqus rau ntawm qhov chaw micelle thiab kho los ntawm cov zog intermolecular van der Waals lossis cov hydrogen bonds, yog li ua rau lawv cov solubility hauv dej ntau ntxiv. Txawm li cas los xij, qhov solubilization ntawm txoj kev no yog me me.
④Kev yaj ntawm cov saw hlau polyoxyethylene: Rau cov surfactants polyoxyethylene-hom, vim yog cov saw hlau molecular ntev ntawm lawv cov hydrophilic pawg, lawv feem ntau nyob rau hauv lub xeev curled. Cov khoom organic tuaj yeem qhwv sab hauv thiab entangled los ntawm cov saw hlau hydrophilic polyoxyethylene. Txoj kev no muaj qhov ntau ntawm solubilization.
Plaub txoj kev daws teeb meem no ua raws li lub hauv paus ntsiab lus ntawm kev yaj zoo li, thiab qhov kev txiav txim ntawm qhov ntau ntawm kev daws teeb meem los ntawm loj mus rau me yog: kev daws teeb meem ntawm cov saw hlau polyoxyethylene > kev daws teeb meem hauv txheej micelle palisade > kev daws teeb meem sab hauv micelle > kev daws teeb meem ntawm qhov chaw micelle.
Nws yog ib qho tsim nyog sau tseg tias txawm hais tias qhov solubility ntawm cov organic hauv dej nce ntxiv vim yog solubilization, cov yam ntxwv ntawm cov tshuaj tsis hloov pauv ntau. Qhov no yog vim tias cov organic molecules yuav tsim cov khoom loj, ua rau tsis muaj kev nce ntxiv ntawm cov khoom me me hauv cov tshuaj. Qhov no kuj ua pov thawj tsis ncaj qha rau qhov kev sib txuas thiab kev sib koom ua ke ntawm micelles rau ntau cov organic molecules.
2. Cov yam ntxwv uas cuam tshuam rau kev yaj
Kev yaj tsis yog tsuas yog muaj feem cuam tshuam nrog qhov muaj micelles xwb tab sis kuj cuam tshuam los ntawm cov khoom muaj nyob hauv ntawm cov tshuaj yaj thiab cov tshuaj yaj. Tsis tas li ntawd, txhua yam uas tuaj yeem cuam tshuam rau CMC ntawm surfactants kuj tseem yuav cuam tshuam rau kev yaj.
Cov tshuaj yaj (surfactant)
Kev Ntsuas: Qhov siab dua qhov kev ntsuas ntawm cov surfactant, qhov ntau dua ntawm cov micelles tsim thiab qhov siab dua ntawm kev sib koom ua ke ntawm cov micelles, ua rau lawv cuam tshuam nrog ntau cov solubilizates.
Cov qauv molecular: Qhov ntev ntawm cov hydrophobic hydrocarbon saw, qhov muaj zog dua qhov solubilizing effect; rau surfactants nrog tib pawg hydrophilic, qhov ntev ntawm cov hydrophobic hydrocarbon saw, qhov me dua lawv CMC thiab qhov muaj zog dua qhov solubilizing effect. Tsis tas li ntawd, qhov solubilizing effect ntawm cov non-ionic surfactants feem ntau muaj zog dua li ntawm ionic surfactants.
Solubilize
Feem ntau, qhov polarity ntau dua ntawm cov tshuaj yaj, qhov muaj peev xwm yaj ntau dua. Qhov no yuav yog vim tias cov tshuaj yaj polar feem ntau yuav cuam tshuam nrog cov pab pawg hydrophilic ntawm qhov chaw ntawm micelles los ntawm hydrogen bonds thiab van der Waals forces. Tib lub sijhawm, lawv cov khoom tsis yog polar kuj feem ntau cuam tshuam nrog cov pab pawg hydrophobic ntawm surfactants.
Kub
Rau cov ionic surfactants, qhov nce ntawm qhov kub thiab txias ua rau lawv cov solubilization effect nce ntxiv. Qhov no yog vim tias qhov nce ntawm qhov kub thiab txias ua rau CMC nce ntxiv, ua rau ntau cov surfactants yaj hauv cov tshuaj thiab tsim ntau cov micelles.
Rau cov polyoxyethylene-hom nonionic surfactants, lub peev xwm solubilization kuj nce ntxiv nrog rau qhov kub nce ntxiv. Txawm li cas los xij, thaum qhov kub nce mus txog lossis tshaj qhov huab, qhov cuam tshuam solubilization yuav qaug zog.
Cov electrolyte
Ntxiv cov electrolytes tuaj yeem txhim kho lub peev xwm solubilizing ntawm ionic surfactants rau hydrocarbons tab sis txo lawv lub peev xwm solubilizing rau polar substances. Qhov no yog vim electrolytes neutralize ib feem ntawm cov nqi hluav taws xob ntawm cov hydrophilic pawg, ua rau qhov kev npaj ntawm hydrophilic pawg ntawm micelle nto compact dua, uas yog tsis zoo rau kev ntxig ntawm polar solubilizates.
Rau cov surfactants uas tsis yog ionic, kev ntxiv electrolytes tuaj yeem ua rau lawv lub peev xwm yaj tau zoo dua. Qhov no yog vim muaj cov nyhuv salting-out, uas txo qhov kev txwv ntawm dej rau ntawm cov surfactant molecules, ua rau lawv txav mus los tau zoo dua, thiab ua rau nws yooj yim dua rau micelles los tsim.
Kev yaj yog ib qho teeb meem nyuaj uas cuam tshuam los ntawm ntau yam. Los ntawm kev nkag siab tob txog cov yam no thiab lawv cov txheej txheem sib cuam tshuam, peb tuaj yeem siv kev yaj zoo dua los ua kom zoo dua cov txheej txheem tshuaj lom neeg thiab kev ua haujlwm ntawm cov khoom.
Lub sijhawm tshaj tawm: Lub Peb Hlis-24-2026