Cov txheej txheem ntawm kev sib cais gel rau cais cov ntshav thiab cov ntshav txhaws

Lub mechanism ntawmsib cais gel

Cov kua dej sib cais gel yog tsim los ntawm hydrophobic organic compounds thiab silica hmoov.Nws yog thixotropic mucus colloid.Nws cov qauv muaj ntau ntawm hydrogen bonds.Vim yog kev sib koom ua ke ntawm hydrogen bonds, lub network qauv tsim.Nyob rau hauv qhov kev txiav txim ntawm lub zog centrifugal, lub network qauv raug rhuav tshem thiab hloov pauv.Rau cov kua dej uas tsis tshua muaj viscosity, thaum lub zog centrifugal ploj mus, nws rov tsim cov qauv network, uas yog hu ua thixotropy.Ntawd yog, nyob rau hauv qhov xwm txheej ntawm qhov kub thiab txias, qee qhov kev siv dag zog yog siv rau cov mucus colloid, uas tuaj yeem hloov pauv los ntawm lub xeev siab-viscosity gel mus rau lub xeev qis viscosity, thiab yog tias lub zog mechanical ploj mus, nws yuav rov qab mus tus thawj high-viscosity gel xeev.Qhov tshwm sim ntawm gel thiab sol interconversion uas tshwm sim los ntawm kev ua ntawm cov neeg kho tshuab rog yog thawj lub npe hu ua Freundlich thiab Petrifi.Vim li cas qhov kev sib cuam tshuam ntawm gel thiab sol tshwm sim vim qhov kev txiav txim ntawm txhua yam quab yuam?Thixotropy yog vim tias cov qauv ntawm cov gel sib cais muaj ntau ntawm hydrogen bond network qauv.Tshwj xeeb, daim ntawv cog lus hydrogen tsis yog tsuas yog tsim ib daim ntawv cog lus nkaus xwb, tab sis kuj tsim cov ntawv cog lus tsis muaj zog hydrogen nrog rau lwm cov khoom tsis zoo uas raug nqi raws li qee yam kev mob.Nyob rau hauv chav tsev kub, lub hydrogen daim ntawv cog lus yog ib qho yooj yim mus txiav tawm kom recombination.Lub silica nto muaj silyl hydroxyl pawg (SiOH) los tsim SiO molecular aggregates (particles), uas yog txuas los ntawm hydrogen bonds los tsim cov saw zoo li cov khoom.Cov saw silica hais thiab cov khoom ntawm cov hydrophobic organic compound tsim cov gel sib cais ntxiv rau hydrogen bonds los tsim cov qauv network thiab tsim cov gel molecules nrog thixotropy.

Lub ntiajteb txawj nqus tshwj xeeb ntawm cov gel sib cais yog khaws cia ntawm 1.05, qhov tshwj xeeb lub ntiajteb txawj nqus ntawm cov ntshav yog li 1.02, thiab qhov tshwj xeeb ntawm cov ntshav txhaws yog li 1.08.Thaum cov gel sib cais thiab cov ntshav coagulated yog centrifuged nyob rau hauv tib lub raj, hydrogen saw network qauv nyob rau hauv lub silica aggregate yog tshwm sim los ntawm lub centrifugal quab yuam siv rau lub cais gel.Tom qab raug rhuav tshem, nws dhau los ua cov qauv zoo li cov saw hlau, thiab cov gel sib cais ua ib yam khoom uas muaj viscosity tsawg.Cov ntshav txhaws hnyav dua li cov gel sib cais txav mus rau hauv qab ntawm lub raj, thiab cov gel cais tawm rov qab, ua peb txheej ntawm cov ntshav txhaws / cais gel / ntshav hauv qab ntawm lub raj.Thaum lub centrifuge nres rotating thiab poob lub centrifugal quab yuam, cov saw particles ntawm silica aggregates nyob rau hauv lub sib cais gel tsim ib tug network qauv dua los ntawm hydrogen bonds, rov pib lub siab viscosity gel lub xeev, thiab tsim ib tug cais txheej ntawm cov ntshav txhaws nyob rau hauv lub cev. ntshav qab zib.