Physicochemical Properties of Alkyl Polyglycosides-Phase cwj pwm

Binary systems

Daim duab theem ntawm C12-14 alkyl polyglycoside (C12-14 APG) / dej sib txawv ntawm cov saw luv APG.(Daim duab 3).Ntawm qhov kub thiab txias, ib cheeb tsam ntawm cov khoom / kua hauv qab ntawm Kafft point yog tsim, nws dhau ntau qhov concentration ntau.Nrog rau qhov kub thiab txias, lub kaw lus hloov mus rau theem isotropic kua.Vim hais tias cov crystallization yog kinetically retarded mus rau ib tug ntau npaum li cas, qhov no theem ciam teb hloov txoj hauj lwm nrog lub sij hawm cia.Ntawm qhov tsis tshua muaj siab, isotropic kua theem hloov siab tshaj 35 ℃ rau hauv cheeb tsam ob-theem ntawm ob theem ua kua, raws li ib txwm pom nrog cov nonionic surfactants.Ntawm qhov siab tshaj 60% los ntawm qhov hnyav, ib theem ntawm cov kua crystalline theem yog tsim nyob rau hauv tag nrho cov kub.Nws yog ib qho tsim nyog hais tias nyob rau hauv ib cheeb tsam isotropic ib theem, qhov pom tseeb ntws birefringence tuaj yeem pom thaum cov concentration tsuas yog qis dua li cov theem yaj, thiab tom qab ntawd ploj mus sai sai tom qab cov txheej txheem shear tiav.Txawm li cas los xij, tsis pom thaj tsam polyphase raug cais tawm ntawm theem L1.Nyob rau theem L1, lwm thaj av uas tsis muaj zog txaus birefringence nyob ze rau qhov tsawg kawg nkaus tus nqi ntawm cov kua / kua miscibility sib txawv.
Kev tshawb nrhiav phenomenological rau hauv cov qauv ntawm cov kua crystalline theem tau ua los ntawm Platz li al.Siv cov txheej txheem xws li polarization microscopy.Ua raws li cov kev tshawb fawb no, peb thaj chaw sib txawv lamellar raug txiav txim siab hauv cov ntsiab lus C12-14 APG: Lα_{l ,}Lα_lhthiab Lαh.Muaj peb qhov sib txawv textures raws li polarization microscopy.
Tom qab khaws cia rau lub sijhawm ntev, ib txwm lamellar kua crystalline theem tsim tsaus pseudoisotropic cheeb tsam nyob rau hauv lub teeb polarized.Cov cheeb tsam no tau pom meej meej cais los ntawm cov cheeb tsam sib txawv heev.Lub Lαh theem, uas tshwm sim nyob rau hauv nruab nrab concentration ntau ntawm cov kua crystalline theem cheeb tsam, nyob rau hauv kuj kub kub, qhia tau hais tias xws li textures.Schlieren textures yeej tsis tau pom, txawm hais tias muaj zog birefringent oily streaks feem ntau tam sim no.Yog tias ib qho piv txwv uas muaj Lαh theem yog txias los txiav txim qhov Kafft point, qhov kev ntxhib los mos hloov qis dua tus yam ntxwv kub.Cov cheeb tsam pseudoisotropic thiab cov lus qhia meej oily streaks ploj mus.Thaum pib, tsis muaj C12-14 APG crystallizes, es tsis txhob, ib theem tshiab lyotropic uas qhia tsuas yog tsis muaj zog birefringence yog tsim.Ntawm cov concentrations siab, theem no nthuav mus txog qhov kub thiab txias.Nyob rau hauv cov ntaub ntawv ntawm alkyl glycosides, ib tug txawv qhov teeb meem tshwm sim.Txhua electrolytes, nrog rau cov kev zam ntawm sodium hydroxide, ua rau ib tug tseem ceeb txo nyob rau hauv cov ntsiab lus huab.The concentration ntau ntawm electrolytes yog hais txog ib tug txiav txim ntawm qhov loj me me ntawm alkyl polyethylene glycol ethers. Kuj ceeb tias, tsuas muaj qhov sib txawv me ntsis ntawm ib tus neeg electrolytes.Qhov sib ntxiv ntawm alkali txo qhov cloudiness.Txhawm rau piav qhia qhov sib txawv ntawm tus cwj pwm ntawm alkyl polyglycol ethers thiab alkyl polyglycol ethers, nws tau xav tias OH pawg hauv cov piam thaj tau dhau los ua ntau hom dej nrog pawg ethylene oxide.Qhov cuam tshuam loj dua ntawm electrolytes ntawm Alkyl polyglycol ethers qhia tias muaj nqi ntawm cov alkyl polyglycoside micelles, thaum alkyl polyethylene glycol ethers xav tias tsis muaj nqi.
Yog li, alkyl polyglycosides coj zoo li kev sib xyaw ntawm alkyl polyglycol ethers thiab anionic surfactants.Kev tshawb fawb ntawm kev sib cuam tshuam ntawm alkyl glycosides thiab anionic lossis cationic surfactants thiab kev txiav txim siab ntawm lub peev xwm hauv emulsion qhia tias alkyl glycosides micelles muaj qhov tsis zoo ntawm pH. qhov sib txawv ntawm 3 ~ 9.In sib piv, tus nqi ntawm alkyl polyethylene glycol ether micelles tsis muaj zog lossis ze rau xoom.Yog vim li cas vim li cas alkyl glycoside micelles raug nqi tsis zoo tsis tau piav qhia tag nrho.