Emkhakheni we-chemistry, amanye amakhemikhali e-organic, ngenxa yezakhiwo zawo zokungancibiliki noma ukuncibilika kancane emanzini, aletha izinkinga eziningi ekusetshenzisweni okusebenzayo. Kodwa-ke, lapho la makhemikhali e-organic ehlala ndawonye nama-surfactants, ukuncibilika kwawo kuyanda kakhulu, into eyaziwa ngokuthi ukuncibilika. Ama-surfactants asebenza njenge-solubilizers kule nqubo, kuyilapho amakhemikhali e-organic ancibilika abizwa ngokuthi ama-solubilizates. Lesi sihloko sizohlola indlela yokuncibilika kanye nezici zayo ezithonyayo.
Ukuvela kokuncibilika kuhlobene kakhulu nezakhiwo zama-surfactants. Ukuhlolwa kubonise ukuthi lapho ukugcwala kwama-surfactants kuphansi kune-critical micelle concentration (CMC), ukuncibilika kwezinto eziphilayo akushintshi kakhulu; noma kunjalo, lapho ukugcwala kudlula i-CMC, ukuncibilika kuyanda kakhulu. Lokhu kungenxa yokuthi kulokhu kugcwala, ama-surfactants aqala ukwakha ama-micelles, kanti ukuncibilika kuhlobene kakhulu nokwakheka kwama-micelles.
Kuye ngokuthi into encibilikisiwe ikuphi ku-micelle, kunezindlela ezine zokuncibilikisa:
①Ukuncibilika ngaphakathi kwe-micelle: Le ndlela ifaneleka ezintweni ezilula ze-hydrocarbon ezingezona i-polar, njenge-benzene, i-ethylbenzene, kanye ne-n-heptane. Zincibilika kalula ngaphakathi kwe-micelle ngoba ingaphakathi le-micelle lingabhekwa njenge-compound emsulwa ye-hydrocarbon, enezakhiwo ezifanayo nalezi zinto.
②Ukuncibilika kwengqimba ye-micelle palisade: Ezintweni eziphilayo ezi-polar ezifana ne-alcohols nama-acid ane-chain ende, zisatshalaliswa ngokushintshana nangokuhambisana nama-molecule e-surfactant. Izingxenye ezingezona ezi-polar zixhumana namaqembu e-hydrophobic ama-surfactants ngokusebenzisa amandla e-van der Waals, kuyilapho izingxenye ze-polar zixhunywe kumaqembu e-hydrophilic ama-surfactants ngokusebenzisa amandla e-van der Waals kanye nezibopho ze-hydrogen.
③Ukuncibilika ebusweni be-micelle: Izinto ezincane, amadayi, njll., zizomuncwa ebusweni be-micelle futhi ziqiniswe ngamandla e-van der Waals noma amabhondi e-hydrogen, ngaleyo ndlela kwandiswe ukuncibilika kwazo emanzini. Kodwa-ke, inani lokuncibilika ngale ndlela lincane kakhulu.
④Ukuncibilika phakathi kwamaketanga e-polyoxyethylene: Kuma-surfactants ohlobo lwe-polyoxyethylene, ngenxa yochungechunge olude lwama-molecule lwengxenye yawo yeqembu le-hydrophilic, avame ukuba sesimweni sokugoba. Izinto eziphilayo zingasongwa ngaphakathi futhi ziboshwe ngamaketanga e-polyoxyethylene aphilizayo. Le ndlela inenani elikhulu lokuncibilika.
Lezi zindlela ezine zokuncibilikisa zonke zilandela isimiso sokuncibilikisa okufana nokufana, futhi ukuhleleka kwenani lokuncibilikisa kusukela kokukhulu kuya kokuncane yilokhu: ukuncibilikisa phakathi kwamaketanga e-polyoxyethylene > ukuncibilikisa kungqimba lwe-micelle palisade > ukuncibilikisa ngaphakathi kwe-micelle > ukuncibilikisa ebusweni be-micelle.
Kuyaphawuleka ukuthi nakuba ukuncibilika kwezinto eziphilayo emanzini kukhuphuka ngenxa yokuncibilika, izakhiwo zesisombululo azishintshi kakhulu. Lokhu kungenxa yokuthi ama-molecule ezinto eziphilayo angakha izinhlayiya ezinkulu, okuholela ekungakhuphuki okuphawulekayo enanini lezinhlayiya esixazululweni. Lokhu futhi kufakazela ngokungaqondile umphumela wokubopha kanye nokuhlangana kwama-micelles enanini elikhulu lama-molecule ezinto eziphilayo.
2. Izinto ezithinta ukuncibilika
Ukuncibilika akuhlobene nje kuphela nokuba khona kwama-micelles kodwa futhi kuthinteka yizakhiwo ezingokwemvelo zesincibilikisi kanye ne-substance encibilikisiwe. Ngaphezu kwalokho, noma yisiphi isici esingathinta i-CMC yama-surfactants sizothinta nokuncibilika.
Isinyibilikisi (i-surfactant)
Ukuhlushwa: Uma ukuhlushwa kwe-surfactant kuphakeme, kulapho inani lama-micelles akheka khona likhulu futhi izinga lokuhlangana kwama-micelles liphakeme, okwenza akwazi ukusebenzisana nama-solubilizates amaningi.
Isakhiwo sama-molecule: Uma uchungechunge lwe-hydrocarbon oluhlala lude lune-hydrophobic, kulapho umphumela wokuncibilikisa uba namandla khona; kuma-surfactants aneqembu elifanayo le-hydrophilic, kulapho uchungechunge lwe-hydrocarbon oluhlala lude lune-hydrophobic, kulapho i-CMC yawo iba ncane khona futhi umphumela wokuncibilikisa uba namandla khona. Ngaphezu kwalokho, umphumela wokuncibilikisa wama-surfactants angewona ama-ionic uvame ukuba namandla kunowe-ionic surfactants.
Ukuncibilikisa
Ngokuvamile, lapho i-polarity yento encibilikisiwe inkulu, kulapho amandla okuncibilikisa aba maningi khona. Lokhu kungenzeka ngoba izinto ezincibilikisiwe ezindaweni ezibandayo cishe zixhumana namaqembu aphilizayo ebusweni be-micelles ngokusebenzisa izibopho ze-hydrogen kanye namandla e-van der Waals. Ngesikhathi esifanayo, izingxenye zazo ezingezona izindawo ezibandayo nazo zivame ukusebenzisana namaqembu aphilizayo ezindaweni ezibandayo zama-surfactants.
Izinga lokushisa
Kuma-ionic surfactants, ukwanda kwezinga lokushisa kuthuthukisa umphumela wawo wokuncibilika. Lokhu kungenxa yokuthi ukwenyuka kwezinga lokushisa kwandisa i-CMC, okuvumela ama-surfactants amaningi ukuthi ancibilike esixazululweni futhi akhe ama-micelle amaningi.
Kuma-surfactants angewona ama-ionic ohlobo lwe-polyoxyethylene, amandla okuncibilikisa nawo ayanda ngokushisa okwandayo. Kodwa-ke, lapho izinga lokushisa lifika noma lidlula iphuzu lamafu, umphumela wokuncibilikisa uzoba buthaka.
I-Electrolyte
Ukwengeza ama-electrolyte kungathuthukisa amandla okuncibilikisa ama-ionic surfactants kuma-hydrocarbon kodwa kunciphise amandla awo okuncibilikisa izinto ezi-polar. Lokhu kungenxa yokuthi ama-electrolyte anciphisa ingxenye yeshaja kagesi yamaqembu e-hydrophilic, okwenza ukuhlelwa kwamaqembu e-hydrophilic ebusweni be-micelle kube kuncane kakhulu, okuyinto engathandeki ekufakweni kwama-polar solubilizates.
Kuma-surfactants angewona ama-ionic, ukufaka ama-electrolyte kungathuthukisa amandla awo okuncibilikisa. Lokhu kungenxa yomphumela wokukhipha usawoti, okunciphisa ukuvinjelwa kwamanzi kuma-molecule e-surfactant, kwandisa ukuhamba kwawo, futhi kwenza kube lula ukuthi ama-micelles akheke.
Ukuncibilika kuyisici esiyinkimbinkimbi esithinteka yizici ezahlukahlukene. Ngokuthola ukuqonda okujulile ngalezi zici kanye nezindlela zazo zokuxhumana, singasebenzisa kangcono ukuncibilika ukuze senze ngcono izinqubo zamakhemikhali kanye nokusebenza komkhiqizo.
Isikhathi sokuthunyelwe: Mashi-24-2026