Kwicandelo lekhemistri, ezinye iikhompawundi zendalo, ngenxa yeempawu zazo zokunganyibiliki okanye ukunyibilika kancinci emanzini, zizisa iingxaki ezininzi kwizicelo ezisebenzayo. Nangona kunjalo, xa ezi khompawundi zendalo zihlala kunye nee-surfactants, ukunyibilika kwazo kuyanda kakhulu, into eyaziwa ngokuba yi-solubilization. Ii-surfactants zisebenza njengezinyibilikisi kule nkqubo, ngelixa iikhompawundi zendalo ezinyibilikayo zibizwa ngokuba zii-solubilizates. Eli nqaku liza kujonga indlela yokunyibilika kunye nezinto ezichaphazelayo.
Ukwenzeka kokunyibilika kunxulumene kakhulu neempawu ze-surfactants. Uvavanyo lubonise ukuba xa uxinzelelo lwe-surfactants luphantsi kune-critical micelle concentration (CMC), ukunyibilika kwezinto eziphilayo akutshintshi kakhulu; nangona kunjalo, xa uxinzelelo ludlula i-CMC, ukunyibilika kuyanda kakhulu. Oku kungenxa yokuba kolu xinzelelo, ii-surfactants ziqala ukwenza ii-micelles, kwaye ukunyibilika kunxulumene kakhulu nokwakheka kwee-micelles.
Ngokuxhomekeke kwindawo yento enyibilikisiweyo kwi-micelle, kukho iindlela ezine zokunyibilikisa:
①Ukunyibilika ngaphakathi kwi-micelle: Le ndlela ifanelekile kwizinto ezilula ze-hydrocarbon ezingezizo i-polar, ezifana ne-benzene, i-ethylbenzene, kunye ne-n-heptane. Zinyibilika lula ngaphakathi kwi-micelle kuba ingaphakathi le-micelle linokuthathwa njenge-compound ye-hydrocarbon ecocekileyo, eneempawu ezifanayo nezi zinto.
②Ukunyibilika kumaleko we-micelle palisade: Kwizinto eziphilayo ze-polar ezifana nee-alcohols kunye nee-asidi ezinde, zisasazwa ngokwahlukana nangokuhambelana neemolekyuli ze-surfactant. Iindawo ezingezizo ze-polar zisebenzisana namaqela e-hydrophobic e-surfactants ngokusebenzisa amandla e-van der Waals, ngelixa iindawo ze-polar ziqhagamshelwe kumaqela e-hydrophilic e-surfactants ngokusebenzisa amandla e-van der Waals kunye neebhondi ze-hydrogen.
③Ukunyibilika kumphezulu we-micelle: Izinto ze-macromolecular, iidayi, njl.njl., ziya kutsalwa kumphezulu we-micelle kwaye zilungiswe ngamandla e-intermolecular van der Waals okanye iibhondi ze-hydrogen, ngaloo ndlela zonyusa ukunyibilika kwazo emanzini. Nangona kunjalo, ubungakanani bokunyibilika ngale ndlela buncinci kakhulu.
④Ukunyibilika phakathi kweemixokelelwane ze-polyoxyethylene: Kwi-surfactants zohlobo lwe-polyoxyethylene, ngenxa yemixokelelwane ende yeemolekyuli zeqela labo elihlala limanzi, zihlala zikwimeko yokugoba. Izinto eziphilayo zinokusongwa ngaphakathi kwaye zibanjwe ziimixokelelwane ze-polyoxyethylene ezihlala zimanzi. Le ndlela inomlinganiselo omkhulu wokunyibilika.
Ezi ndlela zine zokunyibilikisa zonke zilandela umgaqo we-like dissolves like, kwaye ulandelelwano lwe-solubilization ubungakanani ukusuka kwi-large ukuya kwi-small yi: ukunyibilikisa phakathi kwe-polyoxyethylene chains > ukunyibilikisa kwi-micelle palisade layer > ukunyibilikisa ngaphakathi kwe-micelle > ukunyibilikisa kumphezulu we-micelle.
Kubalulekile ukuqaphela ukuba nangona ukunyibilika kwezinto eziphilayo emanzini kusanda ngenxa yokunyibilika, iimpawu zesisombululo azitshintshi kakhulu. Oku kungenxa yokuba iimolekyuli eziphilayo zinokwenza amasuntswana amakhulu, nto leyo engabangela ukuba kungabikho ukwanda okukhulu kwenani lamasuntswana kwisisombululo. Oku kukwangqina ngokungangqalanga isiphumo sokubopha kunye nokudibana kwee-micelles kwinani elikhulu leemolekyuli eziphilayo.
2. Izinto ezichaphazela ukunyibilika
Ukunyibilika akupheleli nje ekunxulumaneni nobukho bee-micelles kodwa kukwachaphazeleka ziimpawu zendalo ze-solubilizer kunye ne-substance enyibilikisiweyo. Ukongeza, nayiphi na into enokuchaphazela i-CMC yee-surfactants nayo iya kuchaphazela ukunyibilika.
Isinyibilikisi (i-surfactant)
Uxinaniso: Okukhona uxinaniso lwe-surfactant luphezulu, kokukhona ubungakanani be-micelles bukhula kwaye inqanaba lokudibana kwe-micelles liphezulu, nto leyo ebenza bakwazi ukusebenzisana nezinye izinto ezinyibilikayo.
Ulwakhiwo lweMolekyuli: Okukhona ityathanga lehydrocarbon elihlala lide, kokukhona isiphumo sokunyibilikisa siqina; kwii-surfactants ezineqela elifanayo le-hydrophilic, kokukhona ityathanga lehydrocarbon elihlala lide, kokukhona i-CMC yazo incinci kwaye isiphumo sokunyibilikisa siqina. Ukongeza, isiphumo sokunyibilikisa se-surfactants ezingezizo i-ionic sihlala sinamandla kunese-ionic surfactants.
Ukunyibilika
Ngokubanzi, xa izinto ezinyibilikayo zisiba nkulu, kokukhona amandla azo okunyibilikisa abe maninzi. Oku kungenxa yokuba izinto ezinyibilikayo zinokuba nokwenzeka ukuba zisebenzisane namaqela athanda amanzi kumphezulu wee-micelles ngokusebenzisa iibhondi ze-hydrogen kunye namandla e-van der Waals. Kwangaxeshanye, iindawo zazo ezingezizo ezo zi-polar nazo zidla ngokusebenzisana namaqela athanda amanzi e-surfactants.
Ubushushu
Kwi-ionic surfactants, ukunyuka kobushushu kuyawuphucula umphumo wazo wokunyibilika. Oku kungenxa yokuba ukunyuka kobushushu kuyawunyusa i-CMC, okuvumela ii-surfactants ezininzi ukuba zinyibilike kwisisombululo kwaye zenze ii-micelles ezingaphezulu.
Kwizinto ezingasebenziyo ze-polyoxyethylene-type nonionic surfactants, amandla okunyibilikisa ayanda ngokwanda kobushushu. Nangona kunjalo, xa ubushushu bufikelela okanye budlula i-cloud point, isiphumo sokunyibilikisa siya kuba buthathaka.
I-Electrolyte
Ukongeza ii-electrolytes kunokuphucula amandla okunyibilikisa ii-ionic surfactants kwii-hydrocarbons kodwa kunciphisa amandla azo okunyibilikisa izinto ezikwi-polar. Oku kungenxa yokuba ii-electrolytes zinciphisa inxalenye yetshaja yombane yamaqela e-hydrophilic, okwenza ulungiselelo lwamaqela e-hydrophilic kumphezulu we-micelle lube mncinci ngakumbi, nto leyo engalunganga ekufakweni kwee-polar solubilizates.
Kwizinto ezingengo-ionic surfactants, ukongeza ii-electrolytes kunokuphucula amandla azo okunyibilikisa. Oku kungenxa yesiphumo setyuwa, esinciphisa ukuthintelwa kwamanzi kwiimolekyuli ze-surfactant, sonyusa ukuhamba kwazo, kwaye senza kube lula ukuba ii-micelles zakheke.
Ukunyibilika yinto enzima echaphazeleka zizinto ezahlukeneyo. Ngokufumana ukuqonda okunzulu kwezi zinto kunye neendlela zokusebenzisana kwazo, singayisebenzisa ngcono ukunyibilika ukuze siphucule iinkqubo zeekhemikhali kunye nokusebenza kwemveliso.
Ixesha leposi: Matshi-24-2026