Qhov sib txawv tseem ceeb ntawm homogeneous thiab heterogeneous nucleation yog tias homogeneous nucleation tshwm sim nyob deb ntawm qhov system whereas lub heterogeneous nucleation tshwm sim ntawm qhov chaw ntawm lub system.
Nucleation yog thawj kauj ruam ntawm cov txheej txheem ntawm kev tsim cov thermodynamic theem tshiab lossis cov qauv tshiab ntawm tus kheej lub koom haum. Nws muaj ob hom; lawv yog homogeneous nucleation thiab heterogeneous nucleation. Lawv txawv ntawm ib leeg raws li qhov chaw uas cov nucleus tsim. Ib qhov chaw nucleation yog cov kua-vapour interface uas cov ntaub ntawv nucleus. Yog li ntawd, cov khoom ncua kev kawm ntawv, npuas los yog qhov chaw ntawm lub cev tuaj yeem ua raws li qhov chaw nucleation. Lub heterogeneous nucleation tshwm sim ntawm qhov chaw nucleation thaum homogenous nucleation tshwm sim deb ntawm qhov chaw nucleation.
Homogeneous Nucleation yog dab tsi?
Homogeneous nucleation yog txheej txheem ntawm nucleation uas tshwm sim ntawm qhov chaw ntawm qhov system (hauv qhov nucleation tshwm sim). Nws yog cov txheej txheem qeeb dua li heterogeneous hom nucleation. Yog li ntawd, qhov no tsis tshua muaj.
Feem ntau, cov nucleation qeeb exponentially nrog lub zog pub dawb. Tsis tas li ntawd, lub zog tiv thaiv no los ntawm kev nplua lub zog pub dawb ntawm kev tsim ntawm qhov chaw loj hlob ntawm nucleus. Ntxiv mus, nyob rau hauv homogeneous nucleation, txij li cov txheej txheem no tshwm sim deb ntawm qhov chaw, lub nucleus zoo li ib tug kheej kheej uas muaj 4Πr 2thaj chaw. Thiab kev loj hlob ntawm lub nucleus tshwm sim nyob ib ncig ntawm tus kheej.
Yuav ua li cas yog Heterogeneous Nucleation?
Heterogeneous nucleation yog txheej txheem ntawm nucleation uas tshwm sim ntawm qhov chaw ntawm lub cev (hauv qhov nucleation tshwm sim). Nws yog ceev tshaj homogeneous hom nucleation. Tsis tas li ntawd, hom nucleation no tshwm sim ntawm qhov chaw nucleation; ib qho kev sib tshuam ntawm kua thiab vapor. Suspended hais, npuas, saum npoo ntawm lub cev tuaj yeem ua raws li qhov chaw nucleation. Tsis zoo li homogeneous hom nucleation, hom no tshwm sim yooj yim.
Daim duab 01: Qhov sib txawv ntawm thaj chaw ntawm qhov chaw ntawm qhov chaw thiab deb ntawm qhov chaw.
Nyob rau hauv heterogeneous nucleation, txij li thaum nws tshwm sim ntawm qhov chaw, lub zog pub dawb rau nucleation yog tsawg. Nws yog vim hais tias, ntawm qhov chaw (interface), thaj tsam ntawm lub nucleus uas yog nyob rau hauv kev sib cuag nrog ib puag ncig cov kua yog tsawg (tsawg dua qhov chaw ntawm ib tug kheej kheej nyob rau hauv homogeneous nucleation). Li no, qhov no txo qis lub zog tsis pub dawb thiab yog li, cov txheej txheem nucleation nrawm nrawm dua.
Qhov txawv ntawm Homogeneous thiab Heterogeneous Nucleation yog dab tsi?
Homogeneous nucleation yog txheej txheem ntawm nucleation uas tshwm sim ntawm qhov chaw ntawm lub cev. Nws tsis koom nrog ib qho chaw nucleation, thiab nws qeeb thiab. Yog li daim ntawv no tsis tshua muaj. Tsis tas li ntawd, thaj chaw saum npoo uas ua rau kev loj hlob ntawm cov nucleus yog siab nyob rau hauv homogeneous nucleation. Heterogeneous nucleation, ntawm qhov tod tes, yog cov txheej txheem ntawm nucleation uas tshwm sim ntawm qhov chaw ntawm lub cev. Nws koom nrog qhov chaw nucleation, thiab nws nrawm heev. Nws yog li no feem ntau hom nucleation. Tsis tas li ntawd, thaj chaw saum npoo uas ua rau muaj kev loj hlob ntawm cov nucleus yog tsawg hauv heterogeneous nucleation. Cov nram qab no infographic nthuav tawm qhov sib txawv ntawm homogeneous thiab heterogeneous nucleation hauv daim ntawv tabular.
Summary – Homogeneous vs Heterogeneous Nucleation
Homogeneous thiab heterogeneous nucleation yog ob hom loj ntawm nucleation. Qhov sib txawv ntawm homogeneous thiab heterogeneous nucleation yog tias homogeneous nucleation tshwm sim tawm ntawm qhov chaw ntawm qhov system whereas heterogeneous nucleation tshwm sim ntawm qhov chaw ntawm lub system.
