Puas yog ua kom Alumina coj tau?

Qhib Aluminayog qhov tsis tseem ceeb adsorbent thiab catalyst kev txhawb nqa hauv cov tshuaj, ib puag ncig, thiab kev lag luam ib puag ncig. Qhov no feem ntau tsa cov lus nug: Puas yog cov tshuab txais hluav taws xob ua kom zoo? Lo lus teb tsis yooj yim "yog" lossis "tsis tau," tab sis theej nyob ntawm nws lub xeev thiab ib puag ncig.

Cov lus teb ncaj qha yog: ntshiab, qhuav ua kom tiav alumina nws tus kheej yog ib qho insulator hluavtaws hluav taws xob thiab tsis coj hluav taws xob.

ICov. Vim li cas thiaj ua kom tau Alumina inherently tsis yog-}?

Ua kom Alumina yog ib qho ntxig ntxeem tau, cov khoom siv tau tawg heev, ib daim ntawv ntawm txhuas oxide. Raws li kev tshawb nrhiav band, alumina muaj qhov sib txawv heev sib txawv, siab li ~ 8-7. Qhov no txhais tau tias nyob rau hauv chav tsev kub, tshuab hluav taws xob hauv nws txoj kev nrhiav qhab-nees tau tawm tsam kom tsis txhob hloov tsheb, tiv thaiv kev tsim cov khoom thauj dawb hauv xov tooj (hluav taws xob lossis qhov). Yog li, nws intrinsic conduction yog tsawg heev, ua nws ib tug insulator.

'Cov. Nyob rau hauv dab tsi tshwm sim ua kom Alumina ua yeeb yam coj ua?

Txawm hais tias cov tshuaj ntsuab ua kom zoo nkauj Alumina tsis yog - next}}}}}}} kev tshaj tawm hauv qab cov khoom siv lossis siv tau hauv cov khoom siv sib xyaw ua ke. Qhov no feem ntau yog vim cov hauv qab no:

1. Adsorbed cov tshuaj (thawj qhov laj thawj)

Cov khoom tseem ceeb ntawm cov alumina ua tau yog nws qhov chaw loj thiab muaj peev xwm ua tiav muaj peev xwm. Nws tuaj yeem adsorb dej molecules thiab ntau yam tshuaj noj los ntawm ib puag ncig.

Adsorbed dej (h₂o): Thaum adsorbed, dej lwg ua ib zaj duab xis dej nyias nyias ntawm cov alumina nto. Cov yeeb yaj kiab dej no muaj cov nyiaj ntawm H⁺ thiab Oh⁻ Eexus (vim dej pib). Thaum qhib alumina yog nthuav tawm cov dej noo, qhov ionic dej zaj duab xis muab txoj hauv kev rau ionic conduction, nce nws cov npoo zoo. Muaj ib zaug qhuav, nws insulating cov khoom rov qab.

Adsorbed Lwm cov elecolytes: yog ua kom alumina adsorbs electrolytes elects thiab lwm yam, cov khoom no yuav ionize thiab tso tawm ions, ntxiv txhim kho nws cov ionic conductivity.

2. Impurity doping

Yog hais tias qee cov hlau ion impurities (xws li na thiab fe⁺) tau ua tiav, txo nws txoj kev tsis taus, tab sis feem ntau tseem nyob deb ntawm theem ntawm tus neeg xyuas kev coj.

3. Raws li ib qho sib xyaw ua ke hauv cov khoom siv sib xyaw

Qhov no yog qhov kev thov feem ntau ntawm kev ua kom zoo li Alumina muaj feem xyuam rau "Conductivity." Txawm hais tias nws tsis muaj inherently conductive, nws tuaj yeem siv ua:

Kev txhawb nqa catalyst: cov hlau catalyticically nquag (xws li PT thiab PD) lossis hlau oxides tau thauj mus rau thaj chaw alumina loj. Cov nquag siv feem ntau yog feem ntau coj los yog semiconducting, ua kom tag nrho cov catalalt particle coj ntawm macroscopic nplai.

Lithium roj teeb cais txheej: hauv qhov siab {{0} ion roj teeb alumina lossis lwm yam khoom siv sib xyaw ua ke rau tus separator. Lub alumina txheej no tseem yog insulating; Nws lub hom phiaj yog txhawm rau txhim kho tus separator lub tshav kub tsis kam, tshuab zog, thiab cov hluav taws xob hluav taws xob ntawm cov hluav taws xob zoo thiab tsis zoo rau kev ua hluav taws xob. Nws tso cai lithium ions kom dhau los ntawm ionic conduction, tab sis nws tseem muab rwb thaiv tsev hauv hluav taws xob.

III. Lub ntsiab

Hauv cov ntsiab lus xaus,Qhib Aluminayog ib qho insulator nyob rau hauv nws. Peb feem ntau xav tias nws tsis yog -. Ib qho kev coj cwj pwm nws cov khoom pov thawj yog vim muaj kev kos duab saum npoo av lossis ua ib feem ntawm cov khoom siv sib xyaw.