Thaum huab cua nkag mus rau hauv cov kua, vim nws yog insoluble nyob rau hauv dej, nws tau muab faib ua ntau npuas los ntawm cov kua nyob rau hauv sab nraud quab yuam, tsim ib tug heterogeneous system. Thaum huab cua nkag mus rau hauv cov kua thiab ua npuas dej, qhov chaw sib cuag ntawm cov pa roj thiab cov kua dej nce, thiab lub zog dawb ntawm lub cev kuj nce raws li.
Cov ntsiab lus qis tshaj plaws sib xws rau qhov peb feem ntau xa mus rau qhov tseem ceeb micelle concentration (CMC). Yog li ntawd, thaum lub surfactant concentration mus txog CMC, muaj ib tug txaus tus naj npawb ntawm surfactant molecules nyob rau hauv lub system kom densely ua raws li cov kua nto, tsim ib tug gap-dawb monomolecular zaj duab xis txheej. Qhov no minimizes qhov system qhov nro. Thaum qhov nro ntawm qhov chaw txo qis, lub zog pub dawb uas yuav tsum tau ua rau kev tsim ua npuas dej hauv qhov system kuj txo, ua npuas tsim tau yooj yim dua.
Nyob rau hauv kev tsim thiab kev siv, los xyuas kom meej lub stability ntawm npaj emulsions thaum lub sij hawm cia, lub surfactant concentration yog feem ntau hloov dua siab tshiab rau qhov tseem ceeb micelle concentration. Thaum qhov no txhim kho emulsion stability, nws kuj muaj qee qhov tsis zoo. Cov surfactants ntau dhau tsis tsuas yog txo qis lub zog ntawm qhov nro tab sis kuj ntim cov huab cua nkag mus rau hauv emulsion, tsim cov yeeb yaj kiab ua kua, thiab ntawm cov kua dej, cov yeeb yaj kiab bilayer molecular. Qhov no ho inhibits npuas vau.
Ua npuas ncauj yog ib qho kev sib sau ua ke ntawm ntau cov npuas, thaum lub npuas yog tsim thaum cov pa tawm mus rau hauv cov kua - roj raws li cov theem dispersed thiab kua raws li cov theem tas mus li. Cov pa hauv npuas tuaj yeem txav los ntawm ib lub npuas mus rau lwm qhov lossis khiav mus rau qhov chaw nyob ib puag ncig, ua rau npuas coalescence thiab ploj mus.
Rau cov dej ntshiab los yog surfactants ib leeg, vim lawv cov khoom sib xws, cov yeeb yaj kiab ua npuas dej tsis muaj elasticity, ua rau cov npuas dej tsis ruaj khov thiab ua rau nws tus kheej tshem tawm. Thermodynamic txoj kev xav qhia tias ua npuas ncauj tsim nyob rau hauv cov kua ntshiab yog ib ntus thiab dissipates vim zaj duab xis ntws.
Raws li tau hais ua ntej, hauv cov txheej txheem dej, dhau li qhov nruab nrab dispersion (dej), kuj tseem muaj emulsifiers rau polymer emulsification, nrog rau cov dispersants, wetting agents, thickeners, thiab lwm yam surfactant-based coating additives. Txij li thaum cov tshuaj no coexist nyob rau hauv tib lub cev, ua npuas ncauj tsim yog heev muaj peev xwm, thiab cov surfactant zoo li Cheebtsam ntxiv stabilize lub generated npuas.
Thaum ionic surfactants tau siv los ua emulsifiers, cov yeeb yaj kiab npuas tau txais hluav taws xob. Vim muaj zog repulsion ntawm tsub nqi, npuas tiv thaiv aggregation, suppressing cov txheej txheem ntawm cov npuas me me merging rau hauv loj dua thiab tom qab ntawd tawg. Yog li ntawd, qhov no inhibits npuas tshem tawm thiab stabilizes npuas.
Post lub sij hawm: Nov-06-2025