Qhov Tseem Ceeb - Sodium Fluoride vs Calcium Fluoride
Sodium Fluoride thiab Calcium Fluoride yog ob lub fluoride minerals ntawm cov ntsiab lus hauv pawg I thiab pawg II ntawm lub sijhawm. Thaum lawv ib txwm muaj nyob rau hauv daim ntawv ntxhia, lawv kuj tau ua lag luam ua lag luam rau kev lag luam. Tab sis, tej yam ntuj tso daim ntawv ntawm sodium fluoride yog comparatively tsawg, thiab calcium fluoride muaj ntau heev. Qhov no tuaj yeem suav tias yog qhov sib txawv tseem ceeb ntawm Sodium Fluoride thiab Calcium Fluoride. Txawm hais tias, lawv yog ob qho tib si fluorides uas muaj cov khoom siv crystalline, lawv cov ntawv thov kev lag luam sib txawv; lawv siv rau ntau lub hom phiaj.
Sodium Fluoride yog dab tsi?
Sodium fluoride yog cov xim tsis muaj xim, tsis muaj ntxhiab, ionic tshuaj lom neeg nrog cov mis molecular NaF. Zoo li sodium chloride, nws yaj hauv dej muab Na+ thiab F– cais.
NaF (s) → Na+ (aq) + F– (aq)
Sodium fluoride ib txwm muaj nyob hauv cov pob zeb hu ua 'villiaumite,' uas yog qhov tsis tshua muaj thiab nws tuaj yeem pom hauv plutonic nepheline syenite pob zeb.
Sodium chloride yog ib qho ntawm cov khoom siv tshuaj fluoride ion ntau tshaj plaws hauv ntau daim ntawv thov kev lag luam vim nws tsis tshua kim thiab tsawg dua hygroscopic compound dua li potassium fluoride (KF).
Villiamumite
Calcium Fluoride yog dab tsi?
Calcium fluoride yog dawb, dej-insoluble, inorganic, ionic tshuaj lom neeg nrog cov mis molecular CaF 2 Nws tseem yog lub npe hu ua fluorspar, thiab nws ib txwm muaj nyob ua ib qho mineral fluorite thiab muaj ib tug sib sib zog nqus xim vim nws impurities. Cov fluorite ntxhia tuaj yeem pom nyob hauv ntau qhov chaw, thiab nws yog siv los ua tus thawj coj rau HF. Tab sis, qee cov txheej txheem kev lag luam xav tau cov calcium floride ntshiab, tsis muaj impurities. Yog li, siab purity CaF2 yog tsim los ntawm kev siv calcium carbonate thiab hydrogen fluoride.
CaCO3 + 2 HF → CaF2 + CO2 + H 2O
calcium fluoride
Qhov txawv ntawm Sodium Fluoride thiab Calcium Fluoride yog dab tsi?
Cov Qauv Tshuaj ntawm Sodium Fluoride thiab Calcium Fluoride
Sodium Fluoride:
Sodium fluoride yog ib qho siv lead ua ionic uas crystallizes hauv lub cubic motif. Hauv nws cov qauv, ob qho tib si Na+ thiab F- muaj qhov chaw sib koom ua ke octahedral, thiab nws qhov sib nrug ntawm lub lattice yog kwv yees li 462 teev tsaus ntuj. Qhov ntev no me me dua li ntawm sodium chloride.
Calcium Fluoride:
Calcium fluoride ib txwm muaj nyob hauv daim ntawv fluorite thiab nws crystallizes lub cubic motif. Ca2+ ua haujlwm yim lub chaw sib koom tes thiab nyob hauv ib lub thawv rau yim F– chaw. Txhua F– chaw yog koom tes rau plaub Ca2+ chaw. Feem ntau, cov pob zeb zoo kawg nkaus tsis muaj xim, tab sis cov pob zeb muaj xim sib sib zog nqus vim F-centers.
Tus qauv ntawm ib chav cell ntawm CaF2 (fluorite) yog qhia hauv qab no.
Kev Siv Sodium Fluoride thiab Calcium Fluoride
Sodium Fluoride:
Sodium fluoride yog siv dav hauv ntau hom kev lag luam suav nrog kev kho mob thiab tshuaj lom neeg kev lag luam. Hauv kev siv tshuaj kho mob, nws yog siv rau hauv kev kho mob cov duab thiab hauv kev kho mob osteoporosis. Hauv kev lag luam tshuaj, nws yog siv rau hauv cov txheej txheem synthesis thiab extraction txheej txheem hauv metallurgy, ua tus neeg saib xyuas thiab ua rau lub plab lom rau cov nroj tsuag noj kab.
Nws kuj yog siv hauv kev kho dej. Nws yog ntxiv rau cov dej haus hauv dej-fluoridation kom nce qib fluoride hauv dej. Hauv qee lub tebchaws, nws tau ntxiv rau qee yam khoom noj.
Calcium Fluoride:
Ob leeg, ib txwm tshwm sim thiab ua lag luam tsim CaF 2 yog qhov tseem ceeb sib npaug hauv ntau daim ntawv thov kev lag luam. Nws yog ib txwm muaj nyob rau hauv fluorite ntxhia, thiab nws yog lub hauv paus ntawm hydrogen fluoride manufacturing txheej txheem. Cov tshuaj tiv thaiv ntawm fluorite ntxhia thiab cov concentrated sulfuric acid tsim hydrogen fluoride.
CaF2 + Conc H2SO4 → CaSO 4 (khoom) + 2 HF
Ntxiv rau, nws yog siv los tsim cov khoom siv kho qhov muag vim nws cov khoom tshwj xeeb. Nws yog pob tshab nyob rau hauv ib tug ntau yam ntawm frequencies; los ntawm ultraviolet (UV) mus rau infrared (IR), qis refractive index thiab insolubility hauv dej. Nws yog siv los tsim qhov rais thiab lo ntsiab muag siv hauv thermal imaging systems, spectroscopy, thiab excimer lasers.
Image Courtesy: "Villiamumite hauv nepheline syenite Sodium fluoride…" los ntawm Dave Dyet - shutterstone.com, dyet.com - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia "Calcium Floride" (Public Domain) ntawm Commons Wikimedia " Sodium Floride” Los ntawm Benjah-bmm27 - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia “Crystal structure of fluorite” los ntawm Materialscientist ntawm English Wikipedia (CC BY-SA 3.0) ntawm Commons Wikimedia
