Dab tsi yogprecipitated silicathiab dawb carbon dub?
Taw qhia rau dawb carbon dub
Dawb carbon dub yog lub npe dav dav ntawm dawb hmoov X-ray amorphous silicic acid thiab silicate khoom, kuj hu ua hydrated silica. Nws lub npe Askiv yog Silica, feem ntau yog xa mus rau precipitated silica, fumed silica, ultrafine silica gel thiab aerogel. Cov tsos ntawm precipitated dawb carbon dub yog micro hlaws, hmoov, blocky thiab ultra-fine, thaum lub fumed dawb carbon dub yog ultra-zoo hmoov.
Cov qauv ntawm dawb carbon dub
Cov qauv ntawm cov xim dawb carbon dub: siv lead ua dawb carbon dub yog peb-dimensional network siv lead ua tsim los ntawm silicon atoms thiab oxygen atoms nrog covalent bonds. Tsis muaj ib qho dawb carbon dub molecule hauv cov siv lead ua. Cov silicon atoms ntawm dawb carbon dub yog nyob rau hauv nruab nrab ntawm lub tetrahedron li niaj zaus, thiab lawv tau ua ke nrog plaub oxygen atoms nyob rau sab saum toj ces kaum ntawm lub tetrahedron li niaj zaus los tsim ib tug li niaj zaus tetrahedron feem nrog covalent ib daim ntawv cog lus. Si-O daim ntawv cog lus rov ua dua hauv qhov chaw, tsim "macromolecule". Hauv cov siv lead ua, muaj 6 silicon atoms thiab 6 oxygen atoms ntawm lub nplhaib me, tag nrho ntawm 12 atoms. Tus lej piv ntawm silicon rau oxygen atoms yog 1: 2, yog li cov qauv yooj yim ntawm kev sib xyaw yog SiO2. Tsis muaj ib qho molecule hauv cov siv lead ua.
Lub cev muaj zog ntawmdawb carbon dub
Dawb carbon dub siv lead ua yog ib qho nyuaj, nkig, tsis-conductive, refractory (melting point 1710 degree) thiab dej-insoluble tsis muaj xim.
Cov khoom siv tshuaj lom neeg ntawm cov pa roj carbon dub
Dawb carbon dub yog anhydride ntawm silicic acid, tab sis nws tsis tuaj yeem hnov mob nrog dej los ua silicic acid. Vim muaj zog silicon oxygen daim ntawv cog lus, cov tshuaj muaj zog ruaj khov heev. Nws yog cov kua qaub oxide nrog qee cov khoom ntawm cov kua qaub oxide. Piv txwv li, nws tuaj yeem cuam tshuam nrog alkaline oxide, alkali, soda tshauv, thiab lwm yam los ua silicate nyob rau hauv qhov kub thiab txias; Dawb carbon dub tsis hnov mob nrog cov kua qaub zoo tib yam, thiab muaj cov kua qaub zoo, tab sis tuaj yeem corroded los ntawm hydrofluoric acid, yog li cov neeg feem ntau siv hydrofluoric acid los ua iav; Nws tuaj yeem raug txo kom coarse silicon los ntawm kev txo tus neeg sawv cev muaj zog (carbon) ntawm qhov kub thiab txias.
Kev siv cov pa roj carbon dub
Tam sim no, kev lag luam tsim cov roj carbon dub feem ntau yog los ntawm txoj kev los nag. Cov pa roj carbon dub uas ua rau muaj ntau pawg polar xws li hydroxyl pawg ntawm nws qhov chaw, uas ua rau muaj teeb meem xws li yooj yim adsorption ntawm cov dej molecules, dispersion tsis zoo, thiab yooj yim thib ob aggregation, yog li cuam tshuam rau kev lag luam cov nyhuv ntawm cov pa roj carbon dub. .
Precipitated silica yog ib qho tseem ceeb ntawm cov khoom siv roj hmab, yas, xim, number case, tshuaj tua kab, tshuaj txhuam hniav thiab lwm yam lag luam. Tshwj xeeb tshaj yog nyob rau hauv kev lag luam roj hmab, precipitated silica tau los ua qhov zoo tshaj plaws dawb reinforcing muab tub lim.