Indlela yeijeli yokuhlukanisa
Ijeli yokuhlukanisa i-serum yakhiwe ngama-hydrophobic organic compounds kanye ne-silica powder.I-mucus colloid ye-thixotropic.Ukwakheka kwayo kuqukethe inani elikhulu lamabhondi e-hydrogen.Ngenxa yokuhlangana kwamabhondi e-hydrogen, kwakhiwa isakhiwo senethiwekhi.Ngaphansi kwesenzo samandla e-centrifugal, isakhiwo senethiwekhi siyabhujiswa futhi sishintshwe.Ukuze uthole uketshezi olune-viscosity ephansi, lapho amandla e-centrifugal ephela, aphinde enze isakhiwo senethiwekhi, esibizwa ngokuthi i-thixotropy.Okusho ukuthi, ngaphansi kwesimo sokushisa okungaguquki, amandla athile omshini asetshenziswa ku-mucus colloid, engashintsha kusukela ku-high-viscosity gel state kuya ku-low-viscosity sol state, futhi uma amandla omshini enyamalala, azobuyela emuva. isimo sejeli se-high-viscosity sangempela.Ukwenzeka kokuhlangana kwejeli ne-sol okubangelwa isenzo samandla emishini kwaqalwa kwaqanjwa uFreundlich noPetrifi.Kungani ukusebenzisana phakathi kwejeli ne-sol kwenzeka ngenxa yesenzo samandla emishini?Thixotropy kungenxa yokuthi ukwakheka kwejeli ehlukanisayo kuqukethe inani elikhulu lezakhiwo zenethiwekhi ye-hydrogen bond.Ngokuqondile, isibopho se-hydrogen akwenzi nje kuphela isibopho esisodwa se-covalent, kodwa futhi sakha isibopho se-hydrogen esibuthakathaka namanye ama-molecule akhokhiswa kabi ngaphansi kwezimo ezithile.Ezingeni lokushisa lasekamelweni, ibhondi ye-hydrogen kulula ukunqanyulwa ukuze kubangele ukuhlangana kabusha.I-silica surface inamaqembu e-silyl hydroxyl (SiOH) ukuze akhe ama-SiO amangqamuzana amangqamuzana (izinhlayiya eziyinhloko), ezixhunywe ngamabhondi e-hydrogen ukuze akhe izinhlayiya ezifana neketango.Izinhlayiya ze-silica eziwuchungechunge kanye nezinhlayiya ze-hydrophobic organic compound eyakha ijeli ehlukanisayo yenza izibopho ze-hydrogen ukuze zakhe isakhiwo senethiwekhi futhi zenze ama-molecule ejeli ane-thixotropy.
Amandla adonsela phansi athile ejeli ehlukanisayo agcinwa ku-1.05, amandla adonsela phansi e-serum acishe abe ngu-1.02, futhi amandla adonsela phansi athile ehlule legazi acishe abe ngu-1.08.Lapho ijeli ehlukanisayo kanye negazi elihlangene kufakwe i-centrifuged kuthubhu efanayo yokuhlola, isakhiwo senethiwekhi ye-hydrogen chain ku-silica aggregate sibangelwa amandla aphakathi nendawo asetshenziswa kujeli ehlukanisayo.Ngemva kokubhujiswa, iba yisakhiwo esifana neketanga, futhi ijeli ehlukanisayo iba yinto ene-viscosity ephansi.Ihlule legazi elisindayo kunejeli elihlukanisayo liya phansi kweshubhu, bese ijeli ehlukanisayo ihlehla, yenze izingqimba ezintathu zehlule legazi/ijeli ehlukanisayo/serum ngaphansi kweshubhu.Lapho i-centrifuge iyeka ukujikeleza futhi ilahlekelwa amandla e-centrifugal, izinhlayiya zeketango le-silica aggregates kujeli yokuhlukanisa zakha isakhiwo senethiwekhi futhi ngamabhondi e-hydrogen, zibuyisele isimo sejeli se-viscosity ephezulu, futhi zakha ungqimba lokuzihlukanisa phakathi kwamahlule egazi i-serum.
Isikhathi sokuthumela: Mar-11-2022
