?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Molecular+Dynamics+Investigation+of+Wettability+Transition+of+Copper+and+Design+of+a+Durable+Superwetting+Structure&rft.creator=Huang%2C+Z&rft.creator=Long%2C+J&rft.creator=Luo%2C+K&rft.description=Superwettability+of+clean+metal+surfaces+cannot+endure+for+extended+periods+in+natural+atmospheric+conditions.+Among+the+various+factors+that+may+contribute+to+the+wettability+transition+of+metals%2C+we+believe+that+the+adsorption+of+organics+plays+a+significant+role.+In+this+study%2C+we+investigate+the+impact+and+extent+of+adsorbed+organics+on+the+wettability+of+copper+through+Molecular+Dynamics+simulations+of+carboxyl+acids+adsorbing+on+its+surface.+We+examine+the+change+in+surface+energy+with+increasing+coverage+ratio+of+organics.+The+result+reveals+that+a+clean+metal+surface+exhibits+high+surface+energy%2C+corresponding+to+a+superwettability+nature.+However%2C+as+the+coverage+ratio+of+organics+increases%2C+the+wettability+decreases+and+changes+to+hydrophobic+at+a+coverage+ratio+of+about+0.5-0.6.+The+simulations+indicate+that+this+wettability+transition+is+primarily+caused+by+the+water-repelling+effect+originating+from+the+carbon+backbone+of+the+organic+molecules.+Shorter+molecules+exhibit+lower+water-repelling+strength+and+form+weaker+adsorption+structures%2C+leading+to+a+less+pronounced+wettability+transition.+To+achieve+durable+superwetting%2C+we+propose+a+porous+structure+composed+of+sufficiently+small+voids+that+allow+water+molecules+to+enter+while+preventing+the+penetration+of+organic+molecules.+Experimental+results+demonstrate+that+this+structure+enables+superwetting+to+persist+for+several+months+in+urban+atmospheric+conditions.+These+superwetting+surfaces+hold+significant+potential+for+various+applications+across+different+domains.&rft.publisher=American+Society+of+Mechanical+Engineers&rft.date=2024-01-01&rft.type=Proceedings+paper&rft.language=eng&rft.source=+++++In%3A++Proceedings+of+ASME+2024+7th+International+Conference+on+Micro%2FNanoscale+Heat+and+Mass+Transfer%2C+MNHMT+2024.++++American+Society+of+Mechanical+Engineers+(2024)+++++&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10199818%2F