Dab tsi yog titanium dioxide?
Titanium dioxide (TiO₂) ua lub luag haujlwm tseem ceeb hauv ntau cov ntawv thov kev lag luam thiab lub neej txhua hnub vim nws qhov tshwj xeeb physicochemical zog. Qhov no dawb, khoom lossis hmoov amphoteric oxide tsis tsuas yog muaj cov khoom ruaj khov nrog lub siab melting point (1830-1850 degree) thiab kub kub taw tes (2500-3000 degree), tab sis kuj boasts zoo heev zais hwj chim, tinting zog, thiab photochemical kev ua, ua rau nws yog ib qho ntawm feem ntau siv dawb pigments thoob ntiaj teb, feem ntau hu ua MSG.
Titanium dioxide ib txwm muaj nyob rau hauv peb lub ntsiab siv lead ua: rutile, anatase, thiab brookite. Ntawm cov no, daim ntawv rutile, nrog nws cov qauv siv lead ua zoo tshaj plaws, yog qhov zoo tshaj plaws thermodynamically ruaj khov thiab feem ntau tau txais los ntawm calcining daim ntawv anatase. Qhov kev sib txawv ntawm cov qauv no ncaj qha cuam tshuam rau nws lub cev lub cev- qhov ntsuas qhov ntsuas ntawm daim ntawv rutile (2.76) siab dua li ntawm daim ntawv anatase (2.55), txhais tau tias nws muaj peev xwm cuam tshuam thiab tawg ultraviolet lub teeb, thaum nws lub peev xwm nqus tau qis dua. Cov yam ntxwv no ua rau nws muaj cov khoom tseem ceeb hauv cov tshuaj pleev thaiv hnub tshuaj pleev ib ce, tiv thaiv ob qho tib si UVA thiab UVB rays thaum tswj kom pom tseeb thiab zam qhov "dawb cam khwb cia" cov nyhuv ntawm cov tshuaj pleev thaiv hnub ib txwm muaj. Nano-loj titanium dioxide, nrog nws qhov loj me me (10-50 nanometers), tuaj yeem sib cais nyob rau hauv nruab nrab, ntxiv dag zog rau nws txoj kev tiv thaiv tshav ntuj. Nws kuj muaj tshuaj lom neeg ruaj khov, tsis muaj tshuaj lom, thiab cov khoom siv tshuaj tua kab mob, ua rau nws yog qhov zoo tshaj plaws rau cov tshuaj pleev thaiv hnub organic.
Hauv kev lag luam, "dawb lub zog" ntawm titanium dioxide yog qhov tseem ceeb sib npaug. Raws li cov xim xim, nws suav txog ntau dua 90% ntawm kev siv cov xim dawb thoob ntiaj teb thiab tau siv dav hauv cov txheej txheem, yas, ntawv ua, thiab inks. Hauv cov txheej txheem, titanium dioxide tsis tsuas yog muab cov xim zoo nkauj thiab matte tiav rau cov txheej txheem, tab sis kuj txo cov txheej tuab thiab cov nqi vim nws lub zog zais siab. Hauv plastics, nws txhim kho cov cua sov ua haujlwm, lightfastness, thiab mechanical zog ntawm cov khoom, ncua lawv lifespan. Nyob rau hauv papermaking, anatase titanium dioxide, raws li ib tug muab tub lim, ho txhim kho daim ntawv dawb, gloss, thiab printability thaum txo nqi ntau lawm. Tsis tas li ntawd, titanium dioxide's dielectric tas li (6.6) thiab cov khoom semiconductor ua rau nws yog cov khoom siv tseem ceeb rau kev tsim cov khoom siv hluav taws xob xws li ceramic capacitors thiab piezoelectric ceramics, tsav tsheb kev lag luam hluav taws xob mus rau qhov siab dua thiab kev ntseeg tau.
Daim ntawv thov "cross-kev lag luam" ntawm titanium dioxide yog qhov zoo sib xws. Hauv thaj chaw ntawm photocatalysis, anatase titanium dioxide, vim nws cov kev ua haujlwm photochemical muaj zog, yog siv los decompose organic pollutants, purify huab cua thiab dej, thiab txawm ua tiav nws tus kheej - ntxuav qhov chaw. Nyob rau hauv lub zog sector, nws ua hauj lwm raws li cov khoom siv photoanode rau dye-sensitized solar cells thiab electron thauj txheej rau perovskite solar cells, muab cov tswv yim tshiab rau kev txhim kho lub zog tauj dua tshiab. Hauv kev lag luam khoom noj khoom haus thiab tshuaj, zaub mov- qib titanium dioxide (E171), raws li kev nyab xeeb thiab tsis yog- tshuaj dawb huv, yog siv dav hauv cov khoom qab zib, tshuaj, thiab tshuaj pleev ib ce rau ntxuav hniav dawb thiab npog ntsej muag, thaum nws cov khoom siv tshuaj tua kab mob photocatalytic qhib txoj hauv kev tshiab rau kev siv tshuaj tua kab mob thiab qog. kev kho mob.
Los ntawm cov tshuaj pleev thaiv hnub rau lub hnub ci, los ntawm cov khoom yas mus rau qib siab - cov txheej txheem kawg, titanium dioxide tso tawm "lub zog loj" nrog nws "me me." Nws cov qauv siv lead ua tshwj xeeb, cov khoom siv physicochemical, thiab ntau yam kev siv tsis tau tsuas yog tsim nws txoj haujlwm tseem ceeb hauv kev lag luam tab sis kuj tseem tau tsav kev tsim kho tshiab hauv cov ntaub ntawv science, ib puag ncig engineering, thiab cov thev naus laus zis tshiab. Nrog rau kev nce qib ntawm nanotechnology thiab kev hloov kho saum npoo av, kev ua haujlwm ntawm titanium dioxide yuav ua kom zoo dua qub, thiab nws cov ntawv thov scenarios yuav dhau los ua ntau haiv neeg, pab txhawb ntau "kev txawj ntse dawb" rau kev txhim kho ntawm tib neeg lub neej.
