Ua rau adsorption ntawm activated alumina
Qhov laj thawj yog vim li cas nws muaj peev xwm adsorption yog tias nws qhov chaw muaj lub zog ntau dhau - hu ua" lub zog tsis muaj zog" (tseem hu ua" surface free force field lossis deg gravitational field"). Cov khoom ntawm molecules nyob rau hauv txheej txheej ntawm ib yam khoom yog txawv los ntawm cov nyob rau hauv lub sab hauv. Nyob rau hauv daim duab 1, XY yog cov kua-gas interface, a yog ib tug molecule nyob rau hauv cov kua, thiab B yog ib tug molecule nyob rau saum npoo txheej. Nws tuaj yeem pom tau tias ib qho yog nyiam los ntawm cov molecules nyob ib puag ncig, thiab lub zog sib npaug ntawm txhua qhov kev qhia, thiab lub zog tshwm sim yog xoom. Ntawm ib sab tes, nws yog attracted los ntawm cov molecules hauv cov kua; Ntawm qhov tod tes, nws yog attracted los ntawm cov roj molecules sab nraum cov kua. Txij li thaum cov roj ceev npaum li cas me dua cov kua ceev, nws gravitational attraction rau B molecules yuav rho. Yog li, nws tuaj yeem txiav txim siab tias cov molecules hauv txheej txheej tsuas yog nyiam los ntawm cov molecules hauv cov kua, thiab qhov tshwm sim ntawm qhov kev taw qhia quab yuam yog perpendicular rau cov kua nto thiab taw qhia rau sab hauv ntawm cov kua, kom cov kua muaj qhov sib txawv. ntawm kev txo cov cheeb tsam saum npoo av thiab lub zog muaj peev xwm ntau li ntau tau. Yog vim li cas vim li cas qhov no tsis tuaj yeem txuas ntxiv yog tias muaj lub zog ntawm cov kua dej tawm tsam qhov txo qis ntawm nws qhov chaw nto, uas yog" nto nro". Qhov muaj nyob ntawm qhov nro ua rau cov txheej txheej txheej molecules muaj zog ntau dua li cov molecules sab hauv. Lub zog ntau dhau no hu ua" lub zog tsis muaj zog".
Qhov tseeb, vim li cas rau qhov adsorption ntawm activated alumina tsis yog tsuas yog qhov nro ntawm cov kua-gas interface, tab sis kuj yog" interfacial nro" nrog tib lub zog hauv txhua qhov system uas tuaj yeem tsim qhov sib cuam tshuam (xws li cov khoom siv-gas interface thiab khoom-kua interface). Qhov txo qis ntawm qhov nro yog qhov thermodynamic vim li cas rau qhov adsorption.