Bayyanar rashin kwanciyar hankali na emulsions (flocculation, coalescence, stratification da demulsification)

Akwai hanyoyi da dama na nunaRashin daidaiton emulsion: flocculation, coalescence, stratification (ko sedimentation), demulsification, juyewar lokaci da kuma ripening na Ostwald.

1. Tarin ruwa

Digon da aka watsa a cikin tarin emulsion don samar da tarin digo-digo masu girma uku, waɗanda aka bayyana su a matsayin flocs, kuma wannan tsari ana kiransa flocculation. A cikin yanayi na al'ada, babu manyan canje-canje a cikin girma da rarraba digo-digo a cikin flocs, kuma haɗuwar digo-digo ba ta faruwa, tare da digo-digo yana riƙe da halayensu na asali. Ana haifar da flocculation ta hanyar ƙarfin jan hankali tsakanin digo-digo. Irin waɗannan ƙarfin galibi suna da rauni, suna sa tsarin flocculation ya canza (wanda aka sani da rauni flocculation), kuma tashin hankali na iya raba flocs.

2.Haɗakarwa

Idan digo-digo na flocculates suka haɗu, ruwan da ke cikin ƙananan digo-digo a cikin ya fashe ya samar da manyan beads na ruwa. Wannan tsari ana bayyana shi a matsayin coalescence. Coalescence tsari ne da ba za a iya juyawa ba, wanda ke haifar da raguwar adadin digo-digo da kuma rugujewar emulsions gaba ɗaya, wato rabuwar mai da ruwan. Flocculation yana aiki a matsayin farkon coalescence, yayin da coalescence shine sanadin lalacewar emulsion.

3.Rarrabawa

Saboda bambancin yawan mai da kuma yanayin ruwa, digo-digo za su yi iyo ko su nutse a ƙarƙashin tasirin nauyi, wanda hakan zai samar da daidaiton yawan digo-digo a cikin emulsion. Wannan tsari ana kiransa da creaming ko sedimentation. Duk da cewa creaming yana lalata daidaiton emulsion, emulsion ɗin da kansa ba a lalata shi da gaske ba.

4.Rushewar ƙasa

Emulsion tsari ne mai rashin kwanciyar hankali wanda yanayin daidaiton sa shine rabuwar mai da ruwa (kamar Layer na ruwa da Layer na mai), kuma rushewar abu shine sakamakon da ba makawa. A wasu fannoni na masana'antu, maimakon haka ana buƙatar rushewar abu. Misali, rushewar mai (W/O) don cimma rabuwar mai da ruwa.

5. Bambance-bambance

Emulsion na iya canzawa daga nau'in W/O zuwa nau'in O/W, ko kuma akasin haka, saboda canje-canje a cikin yanayin emulsification, kuma wannan tsari ana kiransa da juyawar lokaci.

6. Ripen na Ostwald

Emulsions masu digo-digo masu girma dabam-dabam (polydisperse emulsions) na iya kasancewa da karko kuma suna tsayayya da flocculation ko coacence. Duk da haka, bayan lokaci, rarrabawar girman digo-digo yana canzawa zuwa manyan digo-digo, lanƙwasa rarrabawar girman digo-digo yana ƙara tarawa, kuma girman digo-digo yakan zama iri ɗaya. Wannan lamari, wanda yayi kama da tsarin nuna lu'ulu'u, ana kiransa Ostwald ripening.