Qhov sib txawv tseem ceeb ntawm nucleation thiab particle loj hlob yog qhov nucleation yog tsim cov qauv tshiab whereas particle loj hlob yog txheej txheem ntawm kev loj hlob ntawm ib tug pre-existed qauv.
Particle loj hlob muaj peb theem: nucleation, coalescent coagulation, thiab agglomeration. Nucleation yog thawj kauj ruam ntawm kev loj hlob particle. Peb feem ntau xa mus rau particle loj hlob li "crystal growth". Li no, nucleation yog thawj kauj ruam ntawm kev tsim siv lead ua.
Nucleation yog dab tsi?
Nucleation yog thawj txheej txheem ntawm kev tsim cov siv lead ua. Cov crystals tuaj yeem tsim los ntawm cov kua, kua lossis los ntawm vapor. Ntawm no, ib tug me me ntawm ions, atoms, thiab molecules tau teem nyob rau hauv cov qauv sib txawv, tsim ib qhov chaw uas ntxiv ions thiab molecules tuaj yeem txuas nrog txhawm rau ua kom cov siv lead ua loj dua. Piv txwv li, nucleation tshwm sim thaum qab zib yog supersaturated hauv dej, cia cov piam thaj molecules los ua ke thiab tsim cov qauv siv lead ua loj.
Daim duab 1: Nucleation
Muaj ob hom txheej txheem nucleation: homogeneous txheej txheem thiab txheej txheem heterogeneous. Cov txheej txheem heterogeneous yog ntau dua li cov txheej txheem homogeneous. Txawm li cas los xij, cov txheej txheem homogeneous yuav zoo dua thaum nws los txog rau supersaturation lossis supercooling.
Particle loj hlob yog dab tsi?
Particle loj hlob los yog siv lead ua kev loj hlob yog txheej txheem ntawm kev nce qhov loj ntawm cov qauv siv lead ua ua ntej. Nws muaj peb theem: nucleation, coalescent coagulation, thiab agglomeration. Ntawm no, nucleation pib txheej txheem, thiab tom qab ntawd ntxiv ions thiab molecules khi nrog cov qauv siv lead ua tshiab kom nws loj dua. Ntxiv mus, crystal kev loj hlob tshwm sim nyob rau hauv tag nrho peb qhov ntev.
Daim duab 2: Kev Loj Hlob Crystal hauv Peb Theem
Tsis tas li ntawd, yog tias cov molecules lossis ions poob rau hauv ntau txoj haujlwm es tsis yog txoj haujlwm tiag tiag hauv cov qauv rov ua dua ntawm cov siv lead ua loj hlob, cov khoom siv lead ua tuaj yeem tsim. Feem ntau, cov molecules lossis ions ntxiab hauv cov siv lead ua nyob rau hauv ib qho chaw ruaj khov; Yog li, crystal kev loj hlob yog irreversible.
Qhov txawv ntawm Nucleation thiab Particle loj hlob yog dab tsi?
Nucleation yog thawj txheej txheem ntawm kev tsim cov siv lead ua thaum lub sij hawm loj hlob los yog siv lead ua loj hlob yog cov txheej txheem ntawm kev nce qhov loj ntawm cov qauv siv lead ua ua ntej. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm nucleation thiab particle loj hlob. Ntxiv mus, thaum nucleation yog txheej txheem pib, particle loj hlob yog kev nthuav tawm ntawm cov txheej txheem pib no.
Piv txwv rau nucleation thiab particle loj hlob muaj xws li homogeneous nucleation ntawm pob zeb diamond nyob rau hauv cov roj theem thiab tsim cov suab thaj crystals thaum qab zib yog supersaturated hauv dej, feem.
Hauv qab infographic qhia txog qhov sib txawv ntawm nucleation thiab particle loj hlob.
Summary – Nucleation vs Particle Growth
Hauv luv luv, nucleation yog thawj kauj ruam ntawm kev loj hlob particle. Qhov sib txawv tseem ceeb ntawm nucleation thiab particle loj hlob yog qhov nucleation yog tsim los ntawm cov qauv tshiab whereas particle loj hlob yog cov txheej txheem ntawm cov qauv uas twb muaj lawm ua ntej loj.
