Cov yam ntxwv cuam tshuam rau kev npog thiab dawb ntawm Titanium Dioxide
Hom thiab cov ntsiab lus ntawm cov teeb meem impurities nyob rau hauv titanium dioxide, txawm tias cov ntsiab lus me me, yuav muaj kev cuam tshuam loj heev rau whiteness, xws li hlau, chromium, cobalt, hniav, tooj liab, manganese, vanadium, lead, thiab lwm yam. Cov teebmeem ntawm impurities, tsis tsuas yog vim cov xim rendering nyhuv ntawm cov impurities sib xyaw lawv tus kheej, tab sis kuj yog vim muaj impurity ions, tshwj xeeb tshaj yog cov hlau hnyav ions, kom cov titanium dioxide lattice nkhaus twisted mus rau hauv ib tug deformation ntawm symmetry poob thiab cov nyhuv. Rutile titanium dioxide yog rhiab heev rau qhov cuam tshuam ntawm impurities, xws li hlau oxide nyob rau hauv rutile titanium dioxide cov ntsiab lus ntau dua {{0}}}.003 feem pua, nws yuav qhia xim, thiab nyob rau hauv anatase titanium dioxide cov ntsiab lus yuav ntau dua. tshaj 0.009 feem pua ua ntej cov tshuaj tiv thaiv xim.
Cov duab, qhov loj me thiab qhov loj me me ntawm cov khoom siv titanium dioxide yuav muaj kev cuam tshuam rau cov xim dawb. Cov duab ntawm cov titanium dioxide hais yuav tsum tau ib tug du contour, tsis muaj cov ces kaum, vim hais tias lub angular nto yuav tsis muaj zog lub reflection ntawm lub teeb. Particle loj yuav tsum tswj ntawm {{0}}.2 ~ 0.4μm. Ntawd yog, nws yog sib npaug rau ib nrab ntawm lub wavelength ntau yam ntawm lub teeb pom kev (0.4 ~ 0.7μm), thiaj li kom tau txais lub teeb pom kev zoo siab thiab ua kom nws cov xim zoo nkauj. Thaum nws cov particle loj tsawg dua {{10}}.1μm, cov khoom siv lead ua pob tshab; Thaum cov khoom loj dhau lawm, txawm tias cov khoom muaj me me (0.1 feem pua ~ 2 feem pua) ntawm cov khoom loj uas muaj qhov loj me me ntawm 0.5μm lossis ntau dua, nws yuav txo qhov muaj peev xwm tawg ntawm cov khoom rau lub teeb, thiab nws tej zaum yuav muaj kev phom sij heev rau cov xim ua haujlwm. Rau qhov particle loj tis, nws yuav tsum tau ua ib yam nkaus thiab lub faib band yuav tsum nqaim.
Lub refractive index ntawm titanium dioxide yog qhov siab tshaj plaws ntawm cov xim dawb. Yog li ntawd, theoretically, nws lub hwj chim npog kuj yog qhov siab tshaj plaws. Tab sis titanium dioxide particle loj, particle qauv thiab dispersion degree cuam tshuam nws lub hwj chim npog. Qhov loj dua qhov me me thiab qhov loj dua qhov tawg, qhov ntau dua lub zog zais hauv qhov ntau dua qhov pom ib nrab-yoj wavelength. Tab sis nws muaj ib qho kev txwv. Thaum qhov nruab nrab particle loj yog 0.2μm, lub hwj chim npog yog qhov siab tshaj plaws, thiab thaum nws tsawg tshaj li ib nrab ntawm qhov pom wavelength, lub npog lub hwj chim yuav txo qis vim lub pob tshab ntawm cov siv lead ua rau lub teeb. Yog li ntawd, nws tsis yog qhov zoo kom muaj qhov loj dhau los yog qhov me me dhau.
