Nekehanga Brownian: he tirohanga whānui.

I roto i te tīmatanga o te whanaketanga o te ariā o ngā pūnaha colloidal, i whakaaro ai e rāpoi āhuatanga nekeneke ahurei ki rongoā pono. whakaaturia rangahau wā-roa i ai enei āhuatanga e tūturu me rongoā colloidal. Kei te kitea te reira e i waenganui ia ratou i reira he kahore rerekētanga kounga, me i reira e ine anake, e whakawhirinaki te nuinga i runga i te rahi me te āhua o te matūriki colloid (micelles). Na reira, ko te whakatuwheratanga o te nekehanga Brownian i roto i tenei tikanga o te faufaa rahi.

Hoki te wā tuatahi (i roto i te tau 1827), i ako nekehanga Brownian i te huaota English Robert Brown. Mātakitaki i tētahi ultramicroscope mo tipu hae, e iri i roto i te taka o te wai, ka kitea te pūtaiao e matūriki mōkitokito o te hae kōhikohikotia (matapōkeretia) me tonu whakakorikoria. nekehanga Brownian - he nekehanga whakahaere, te huru kōpekapeka ranei o microparticles. Kua whakapumautia rangahau maha e meinga te kaupapa matapōkere o ngā rāpoi ngota e rahi matūriki, te pāmahana, me te pokey o te reo purara. I roto i tenei take, te āhua o te taonga e tata kahore pānga i runga i to ratou kaupapa.

nekehanga Brownian me hou ariā rāpoi-konikoni o wai

fokotu'u Garden e te displacement o tetahi whakatikatika rāpoi ngota tata, ia o nei e whangai ana ki te noho i tona tūranga taketake, i te mea te tino pai i roto i ngā o te pūngao.

Ka rite ki te hua, kaupapa ohorere, me te tonu o te tukanga whaiaro tūringiringi-o ngā rāpoi ngota puta. Rewa i roto i te microparticles wai (manene wāhanga) mahi he kaupapa āhua i te taua rite te muingota whakarewa (manene reo). Nā ki te nekehanga huru tonu neke kaha ratou, a kahore e noho i roto i tetahi wahi.

nekehanga Brownian o nga matūriki me te aukati colloidal puta tika ki nekehanga waiariki o te reo e karapoti ana i te matūriki me ratou patuki huru o tenei rāpoi ngota. Ka rite ki te hua o whakaeke taua microparticles matapōkeretia neke i roto i te wāhi (titaria reo). Enei nekehanga Ko te hua o te mahi te ru mo te tetahi wa o te ako (taea kotahi rua o muingota motuhake mamae ake ki te 1020 nga whiu). Homai te meka e te rahi iti o te rāpoi ngota e rerekē moni o nifó i koki rerekē, kei te neke ratou i roto i ngā tohutohu rerekē. Ki te diameter o neke atu i te rima micrometres o microparticles kore whakaritea e kitea nekehanga Brownian. Te whakanui ake i te rahi me te taimaha rāpoi o ratou ru absorbs. Na reira, matūriki ki te taimaha rāpoi tiketike (ki runga, ki te rima micrometers) mahi wiri takahuri anake.

nekehanga Brownian me te tūringiringi

Ka rite ki te hua o te nekehanga Brownian me waiariki o ngā rāpoi ngota puta tīaroaro kukū puta noa te rōrahi otinga. Ka taea e tūringiringi tango i te wahi i roto i rongoā colloidal me tūturu.

Ko te kaha osmotic meinga e te aroaro o micelles. Nā ki te rahi nui o nga rāpoi me ratou pēhanga iti nohanga rawa iti. O te akoranga, te pēhanga i roto i te wahi o te otinga analyte colloidal nuinga whakawhirinaki i runga i te aroaro o poke o ngā electrolytes. Ko te kupu, rongoā macromolecular - polysaccharides, rapa, te pūmua - i 10-12 ōrau kukū i te kaha osmotic nui. Ngā mihi ki te whakaaro motuhake (osmometry) i takoto kaha osmotic o toto wē, i te mea i runga i toharite e pā ana ki te 25 mm HG. Kei te whakamatauria reira, e te mea tika hautanga ki te kukū o ngā matū rewa i roto i rongoā colloidal pono ranei te pēhanga.