Qhov sib txawv tseem ceeb ntawm airgel thiab xerogel yog aerogels tsim thaum cov kua los ntawm cov gel tau muab rho tawm ntawm lub xeev supercritical, whereas xerogel cov ntaub ntawv thaum cov kua los ntawm cov gel yog evaporated ntawm chav tsev kub.
Gel-based nano adsorbents tuaj yeem faib dav rau hauv aerogel, hydrogel, thiab xerogel. Peb tuaj yeem piav qhia txog aerogels thiab xerogels li cov gels qhuav uas tuaj yeem khaws lawv cov ntxeem tau zoo tom qab ua kom qhuav. Qhov kev khaws cia no tuaj yeem ua tiav lossis ib nrab. Cov gels ntxeem tau no muaj cov khoom zoo nkauj uas tshwm sim los ntawm qhov yooj yim tshaj plaws ntawm kev ua sol-gel. Peb tuaj yeem muab qhov no nrog ntau hom kev ziab kom qhuav, uas tuaj yeem ua rau aerogels lossis xerogels.
Aerogel yog dab tsi?
Aerogel tuaj yeem txhais tau tias yog cov khoom tsim los ntawm cov gel los ntawm ziab ntawm lub xeev supercritical. Cov txheej txheem ziab hauv aerogels tuaj yeem piav qhia tias yog khov-drying, supercritical drying, lossis ambient siab ziab. Airgel yog cov khoom siv hnyav thiab nthuav tawm thaj chaw loj ntawm thaj tsam ntawm 200 - 1000 m 2/ g. Nws muaj ntau yam khoom tseem ceeb xws li:
- Ntau npaum li cas tswj qhov pore loj faib
- A siab conductivity
- Transparency
- A low density
- Kev hloov pauv
- Low dielectric tas li
- High mechanical zog
Daim duab 01: Lub Vial ntawm Aerogel
Cov khoom no ua rau airgel tus neeg sib tw muaj zog rau ntau yam kev siv, xws li adsorption ntawm dej paug. Piv txwv li, hom gel no nthuav tawm thaj chaw loj thiab qhov porosity nrog rau lub qhov pore loj. Muaj ntau hom aerogels, suav nrog graphene-based aerogels, silica-based aerogels, zeolite-based aerogels, thiab lwm yam. Cov no yog cov piv txwv feem ntau ntawm aerogels. Ntxiv mus, cov aerogels no tuaj yeem hloov kho tau yooj yim thiab ua haujlwm txhawm rau txhawm rau txhim kho kev xaiv adsorption ntawm electrostatic cuam tshuam.
Xerogel yog dab tsi?
Xerogel yog ib daim ntawv ntawm cov gel tau los ntawm kev ziab nws nrog qhov tsis muaj shrinkage. Cov txheej txheem ziab ntawm xerogels suav nrog cov kuab tshuaj evaporation raws li cov txheej txheem siv cov txheej txheem pa. Xerogels yog cov khoom mesoporous uas muaj thermal stability. Cov khoom tseem ceeb tshaj plaws ntawm xerogel yog raws li hauv qab no:
- Nontoxic
- Nyob zoo
- YBiocompatible
- cheeb tsam siab
- High porosity
- Yuav hloov tau yooj yim
Cov piv txwv feem ntau ntawm xerogels yog carbon-based xerogels thiab silica-based aerogels. Cov no feem ntau yog kev tshawb fawb txog kev ua dej huv.
Daim duab 02: Porous Xerogel
Thaum xav txog cov txheej txheem ziab, alcogel lossis hydrogel uas tau los ntawm lwm cov txheej txheem raug hloov mus rau hauv xerogel. Nyob rau hauv cov txheej txheem no, lub ntim txo los ntawm ib tug npaum li cas uas yog sib npaug zos rau lub ntim ntawm cov kua uas ploj los ntawm evaporation. Ntxiv mus, lub shrinkage ntawm cov gel tshwm sim vim lub capillary rog uas yog exerted los ntawm lub pore-filling kua rau lub pore phab ntsa. Qhov no yog theem uas qhov kev hloov pauv loj tshaj plaws hauv ntim, qhov hnyav, qhov hnyav, thiab cov qauv tshwm sim. Tom qab ntawd, qhov shrinkage tuaj yeem tso tseg vim tias cov gel qhuav tau mus txog qee qhov kev nruj heev.
Qhov txawv ntawm Airgel thiab Xerogel yog dab tsi?
Qhov sib txawv tseem ceeb ntawm airgel thiab xerogel yog aerogels tsim thaum cov kua los ntawm cov gel tau muab rho tawm ntawm lub xeev supercritical, whereas xerogel cov ntaub ntawv thaum cov kua los ntawm cov gel yog evaporated ntawm chav tsev kub. Ntxiv mus, airgel muaj qhov sib piv ntawm thaj chaw loj dua li xerogel.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm airgel thiab xerogel hauv daim ntawv tabular rau kev sib piv ntawm ib sab.
Summary – Airgel vs Xerogel
Aerogel thiab xerogel yog hom tseem ceeb ntawm cov khoom siv gel. Qhov sib txawv tseem ceeb ntawm airgel thiab xerogel yog tias aerogels tsim thaum cov kua los ntawm cov gel tau muab rho tawm ntawm lub xeev supercritical, whereas xerogel cov ntaub ntawv thaum cov kua los ntawm cov gel yog evaporated ntawm chav tsev kub.
