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Iimpawu zePhysicochemical of Alkyl Polyglycosides-Phase yokuziphatha

Iinkqubo zokubini

Umzobo wesigaba se-C12-14 alkyl polyglycoside (C12-14 APG) / inkqubo yamanzi ihluke kwi-short-chain APG. (Umfanekiso 3). Kumaqondo obushushu asezantsi, ummandla oqinileyo/olulwelo ngaphantsi kwendawo yaseKrafft iye yenziwa, phezu koluhlu olubanzi loxinaniso. Ngokunyuka kweqondo lokushisa, inkqubo iyatshintsha ibe yi-isotropic liquid phase. Ngenxa yokuba i-crystallization ihlehliswa ngokwe-kinetically kumlinganiselo omkhulu, lo mda wesigaba utshintsha indawo kunye nexesha lokugcina. Kwiindawo ezisezantsi, isigaba solwelo se-isotropic sitshintsha ngaphezulu kwe-35 ℃ ukuya kwindawo enezigaba ezibini zezigaba zolwelo ezibini, njengoko kuqhelekile ukubonwa nge-nonionic surfactants. Kugxininiso olungaphezulu kwe-60% ngobunzima, ukulandelelana kwesigaba sekristale yolwelo kwenziwa kuwo onke amaqondo obushushu. Kuyafaneleka ukukhankanya ukuba kwingingqi yesigaba esisodwa se-isotropic, ukuhamba kwe-birefringence ebonakalayo kunokubonwa xa ugxininiso lungaphantsi nje kwesigaba esinyibilikisiweyo, kwaye emva koko inyamalale ngokukhawuleza emva kokuba inkqubo yokucheba igqityiwe. Nangona kunjalo, akukho mmandla we-polyphase wafunyanwa ukuba wahlulwe kwisigaba se-L1. Kwinqanaba le-L1, omnye ummandla one-birefringence engenamandla equkuqelayo ibekwe kufutshane nexabiso eliphantsi lolwelo/i-gap yokuxutywa kolwelo.Umzobo 3. Umzobo wesigaba seC12-14
Uphando lwe-Phenomenological kwisakhiwo sezigaba ze-crystalline zamanzi zenziwe nguPlatz et al. Ukusebenzisa iindlela ezifana ne-polarization microscopy. Ukulandela olu phando, imimandla emithathu eyahlukeneyo ye-lamellar iqwalaselwa kwizisombululo ze-C12-14 APG ezigxininisiweyo: Lαl ,Laalhkunye noLah. Kukho iindlela ezintathu ezahlukeneyo zokuthungwa ngokwepolarization microscopy.
Emva kokugcinwa ixesha elide, isigaba esiqhelekileyo se-lamellar liquid crystalline siphuhlisa imimandla emnyama ye-pseudoisotropic phantsi kokukhanya kwe-polarized. Le mimandla yahlulwe ngokucacileyo kwiindawo ezinombhobho we-birefringent. Isigaba se-Lαh, esenzeka kuluhlu oluphakathi loxinaniso lwengingqi yesigaba sekristale yolwelo, kumaqondo obushushu aphezulu, sibonisa ukwakheka okunjalo. I-Schlieren textures ayikaze ibonwe, nangona i-oyile i-oyile idla ngokubakho. Ukuba isampuli equlethe isigaba se-Lαh ipholile ukumisela indawo ye-Krafft, ukuthungwa kuyatshintsha ngaphantsi kweqondo lokushisa. Imimandla ye-pseudoisotropic kunye ne-oil streaks echazwe ngokucacileyo iyanyamalala. Ekuqaleni, akukho C12-14 APG crystallizes, endaweni yoko, isigaba esitsha se-lyotropic esibonisa kuphela i-birefringence ebuthathaka yenziwa. Kwiindawo eziphakamileyo kakhulu, esi sigaba siyanda ukuya kumaqondo obushushu aphezulu. Kwimeko ye-alkyl glycosides, kuvela imeko eyahlukileyo.Yonke i-electrolytes, ngaphandle kwe-sodium hydroxide, ibangele ukunciphisa okukhulu kumanqaku efu.Uluhlu lwe-electrolyte yoxinaniso lumalunga nomyalelo wobukhulu obuphantsi kune-alkyl polyethylene glycol ethers. .Okumangalisayo kukuba, kukho umahluko omncinci kakhulu phakathi kwe-electrolyte nganye.Ukongezwa kwe-alkali kunciphise kakhulu ukufu. Ukucacisa ukungafani kokuziphatha phakathi kwe-alkyl polyglycol ethers kunye ne-alkyl polyglycol ethers, kucingelwa ukuba iqela le-OH eliqokelelwe kwiyunithi ye-glucose liye lafumana iintlobo ezahlukeneyo ze-hydration kunye neqela le-ethylene oxide. Impembelelo enkulu kakhulu ye-electrolytes kwi-Alkyl polyglycol ethers ibonisa ukuba kukho intlawulo kumphezulu we-alkyl polyglycoside micelles, ngelixa i-alkyl polyethylene glycol ethers ithatha akukho ntlawulo.
Ngoko ke, i-alkyl polyglycosides iziphatha njengemixube ye-alkyl polyglycol ethers kunye ne-anionic surfactants. Uphononongo lwentsebenziswano phakathi kwe-alkyl glycosides kunye ne-anionic okanye i-cationic surfactants kunye nokumiselwa kwezinto ezinokubakho kwi-emulsion ibonisa ukuba i-alkyl glycosides micelles ine-pH yentlawulo engaphezulu. Uluhlu lwe-3 ~ 9.Ngokwahlukileyo, ukuhlawulwa kwe-alkyl polyethylene glycol ether micelles ibuthathaka kakuhle okanye isondele kwi-zero. Isizathu sokuba i-alkyl glycoside micelles ihlawuliswe kakubi asikacaciswanga ngokupheleleyo.


Ixesha lokuposa: Oct-22-2020