Ngiyabonga ngokubhalisela i-Physical World Uma ungathanda ukushintsha imininingwane yakho nganoma yisiphi isikhathi, sicela uvakashele i-akhawunti yami
Uju kanye nolunye uketshezi oluqinile lugeleza ngokushesha kunamanzi kuma-capillary ambozwe ngokukhethekile. Lokhu okumangazayo kwenziwe nguMaja Vuckovac kanye nozakwabo e-Aalto University eFinland, abaphinde babonisa ukuthi lo mphumela ophikisanayo uvela ekucindezelweni kokugeleza kwangaphakathi ngaphakathi kwamaconsi amaningi aqinile. Imiphumela yabo iphikisana ngqo namamodeli amanje enkolelo-mbono yokuthi uketshezi lugeleza kanjani kuma-capillary anamandla kakhulu.
Insimu yama-microfluidics ihilela ukulawula ukugeleza koketshezi ezindaweni ezivalekile ze-capillary—ngokuvamile ukwenziwa kwamadivayisi okusetshenziswa kwezokwelapha. Uketshezi olune-viscosity ephansi lungcono kakhulu kuma-microfluidics ngoba lugeleza ngokushesha nangokulula. Uketshezi olune-viscous oluningi lungasetshenziswa ngokuluqhuba ngengcindezi ephezulu, kodwa lokhu kwandisa ukucindezeleka komshini ezakhiweni ze-capillary ezithambile — okungaholela ekwehlulekeni.
Ngaphandle kwalokho, ukugeleza kungasheshiswa kusetshenziswa i-superhydrophobic coating equkethe izakhiwo ezincane nezincane ezibamba imicamelo yomoya. Lezi micamelo zinciphisa kakhulu indawo yokuxhumana phakathi koketshezi kanye nobuso, okunciphisa ukungqubuzana - okwandisa ukugeleza ngo-65%. Kodwa-ke, ngokusho kombono wamanje, lawa mazinga okugeleza ayaqhubeka nokwehla ngokwanda kwe-viscosity.
Ithimba likaVuckovac lihlole le mbono ngokubheka amaconsi anokuthambekela okuhlukahlukene njengoba amandla adonsela phansi ewadonsa kuma-capillary aqondile anezimbozo zangaphakathi eziyingozi kakhulu. Njengoba ehamba ngesivinini esingaguquki, amaconsi acindezela umoya ongaphansi kwawo, okwenza i-gradient yokucindezela efana naleyo esepiston.
Nakuba amaconsi abonisa ubudlelwano obuphambene obulindelekile phakathi kwe-viscosity kanye nesilinganiso sokugeleza emapayipini avulekile, lapho ingxenye eyodwa noma zombili zivaliwe, imithetho yaguqulwa ngokuphelele. Umphumela wawubonakala kakhulu ngamaconsi e-glycerol—yize ama-oda amathathu ngobukhulu e-viscous kunamanzi, ageleza ngokushesha okuphindwe kayishumi kunamanzi.
Ukuze kwembulwe i-physics ngemuva kwalomphumela, ithimba likaVuckovac lafaka izinhlayiya ze-tracer kumaconsi. Ukunyakaza kwezinhlayiya ngokuhamba kwesikhathi kwembule ukugeleza kwangaphakathi okusheshayo ngaphakathi kweconsi elingaqinile kangako. Lokhu kugeleza kubangela ukuthi uketshezi lungene ezakhiweni ezincane nezincane kakhulu ephepheni. Lokhu kunciphisa ukujiya komcamelo womoya, kuvimbele umoya ocindezelwe ngaphansi kweconsi ukuthi ungacindezeli ukuze ulinganisele i-gradient yokucindezela. Ngokuphambene nalokho, i-glycerin cishe ayinakho ukugeleza kwangaphakathi okubonakalayo, okuvimbela ukungena kwayo ephepheni. Lokhu kuphumela kumcamelo womoya ojiyile, okwenza kube lula ukuthi umoya ongaphansi kweconsi uye ohlangothini olulodwa.
Besebenzisa okubonwe yibo, ithimba lakha imodeli ye-hydrodynamic ebuyekeziwe ebikezela kangcono ukuthi amaconsi ahamba kanjani kuma-capillary anezimbozo ezahlukene ze-superhydrophobic. Ngomsebenzi owengeziwe, okutholakele kwabo kungaholela ezindleleni ezintsha zokudala amadivayisi e-microfluidic akwazi ukuphatha amakhemikhali nezidakamizwa eziyinkimbinkimbi.
I-Physics World imele ingxenye ebalulekile yomsebenzi we-IOP Publishing wokuxhumana ngocwaningo kanye nokusungula izinto ezintsha okusezingeni lomhlaba kubabukeli abaningi ngangokunokwenzeka. Le sayithi iyingxenye yephothifoliyo ye-Physics World, ehlinzeka ngeqoqo lezinsizakalo zolwazi eziku-inthanethi, zedijithali kanye neziphrintiwe emphakathini wesayensi womhlaba wonke.