Qhov sib txawv tseem ceeb ntawm fumed silica thiab precipitated silica yog fumed silica feem ntau me me, whereas precipitated silica feem ntau loj loj.
Fumed silica yog ib hom silica uas tsim nyob rau hauv nplaim taws. Nws muaj cov microscopic droplets ntawm amorphous silica fused rau hauv ceg chainlike 3D theem nrab hais tias tuaj yeem tau txais agglomerated rau hauv tertiary hais. Precipitated silica yog ib hom silica uas yog amorphous thiab zoo li cov khoom dawb, hmoov.
Fumed Silica yog dab tsi?
Fumed silica yog ib hom silica uas tsim nyob rau hauv nplaim taws. Nws muaj cov microscopic droplets ntawm amorphous silica fused rau hauv ceg chainlike 3D theem nrab hais tias tuaj yeem tau txais agglomerated rau hauv tertiary hais. Nws tseem hu ua pyrogenic silica.
Daim duab 01: Pom ntawm Fumed Silica
Cov fumed silica hmoov muaj ib qho tsis tshua muaj zog ntom ntom thiab qhov chaw loj. Cov qauv yog 3 qhov loj me, uas tso cai rau kev nce hauv viscosity thiab thixotropic tus cwj pwm thaum siv nws ua cov thickener lossis reinforcing muab tub lim.
Thaum xav txog cov khoom tseem ceeb ntawm fumed silica, nws muaj zog thickening nyhuv. Feem ntau, particle loj yog 5-50 nm. Cov khoom no tsis yog porous, thiab lawv muaj thaj tsam ntawm 50-600 m2 / g.
Daim duab 02: Kev tsim cov Fumed Silica
Txoj kev siv rau fumed silica ntau lawm yog nplaim pyrolysis ntawm silicon tetrachloride los yog quartz xuab zeb uas yog vaporized nyob rau hauv ib tug 3000 degrees hluav taws xob arc. Cov neeg tsim khoom thoob ntiaj teb feem ntau ntawm fumed silica yog Evonik, Cabot Corporation, thiab Wacker Chemie.
Dab tsi yog Precipitated Silica?
Precipitated silica yog ib hom silica uas yog amorphous thiab zoo li cov khoom dawb, hmoov. Cov khoom no yog tsim los ntawm nag lossis daus los ntawm kev daws teeb meem ntawm silicate ntsev. Muaj peb hom loj ntawm amorphous silica li pyrogenic silica, precipitated silica, thiab silica gel. Txawm li cas los xij, precipitated silica muaj qhov tseem ceeb tshaj plaws kev lag luam. Tsis zoo li pyrogenic silica, precipitated silica tsis tseem ceeb microporous.
Feem ntau, precipitated silica ntau lawm pib nrog cov tshuaj tiv thaiv ntawm ib tug nruab nrab silicate tov nrog ib tug mineral acid. Peb yuav tsum ntxiv sulfuric acid thiab sodium silicate daws ib txhij nrog agitation rau dej. Ntxiv mus, peb tuaj yeem ua nag lossis daus hauv acidic. Peb yuav tsum zam kev tsim cov gel los ntawm nplawm nws ntawm qhov kub siab.
Thaum xav txog cov khoom ntawm precipitated silica, lawv yog ntxeem tau, thiab txoj kab uas hla ntawm 5-100 nm. Qhov tshwj xeeb thaj tsam thaj tsam ntawm 5-100 m2 / g. Muaj ntau daim ntawv thov tseem ceeb xws li siv los ua tus muab tub lim, softener, ntxuav, thickening, thiab polishing agents, rau kev ua zaub mov, tshuaj ntau lawm, thiab lwm yam.
Qhov txawv ntawm Fumed Silica thiab Precipitated Silica yog dab tsi?
Fumed silica yog ib hom silica uas tsim nyob rau hauv nplaim taws. Nws muaj cov microscopic droplets ntawm amorphous silica fused rau hauv ceg chainlike 3D theem nrab hais tias tuaj yeem tau txais agglomerated rau hauv tertiary hais. Precipitated silica yog ib hom silica uas yog amorphous thiab zoo li cov khoom dawb, hmoov. Qhov sib txawv tseem ceeb ntawm fumed silica thiab precipitated silica yog tias fumed silica feem ntau me me, whereas precipitated silica feem ntau loj loj.
Cov hauv qab no qhia txog qhov sib txawv ntawm fumed silica thiab precipitated silica hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Fumed Silica vs Precipitated Silica
Silica yog silicone dioxide. Muaj ntau hom silica, xws li fumed silica thiab precipitated silica. Qhov sib txawv tseem ceeb ntawm fumed silica thiab precipitated silica yog tias fumed silica feem ntau yog me me whereas precipitated silica feem ntau loj loj.
