@Article{icces.2023.09838,
AUTHOR = {Pengcheng Nie, Xikai Jiang, Xu Zheng, Dongshi Guan},
TITLE = {Probing Electrified Ionic Liquid-Solid Interface Using Long-Needle AFM},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {25},
YEAR = {2023},
NUMBER = {1},
PAGES = {1--2},
URL = {http://www.techscience.com/icces/v25n1/53812},
ISSN = {1933-2815},
ABSTRACT = {“How	can	we	measure	interface	phenomena	on	the	microscopic	level”	is	a	fundamental	question	that	has	
been	with	us	for	many	years	and	is	also	listed	in	recent	Science	125	question. It	is	even	harder	to	explore	
the	 electrified	 interface.	 	 In	 this	 work,	 we	 report	 atomic-force-microscope	 measurements	 of	 interfacial	
dynamics	of	an	electrified room-temperature	ionic	liquid	(RTIL)-solid	interface. RTILs	are	intriguing fluids	
that	have	drawn	much	attention	in	applications	ranging	from	tribology	and	catalysis	to	energy	storage.	With	
strong	electrostatic	interaction	between	ions,	their	interfacial	behaviors	can	be	modulated	by	controlling	
energetics	of	the	electrified	interface.	Using	a	unique	long-needle AFM	technique [1-4],	we	measure	contact	
angle	hysteresis	(CAH) of	a	circular	contact	line formed	on	a	micron-sized	fiber,	which	is	coated	with	a	thin	
layer	of	conductive	film	and	intersects	a	RTIL-air	interface. The	measured	CAH	shows	a	distinct	transition	
by	increasing	the	voltage applied	on	the	fiber	surface.	Molecular	dynamics	simulations	were	performed	to	
illustrate	variations	of	the	solid-like	layer	in	the	RTIL	adsorbed	at	the	electrified	interface.	The	integrated	
experiments	and	computations	demonstrate	a	new	mechanism	to	manipulate the	CAH	by	rearrangement	of	
interfacial	layers	of	RTILs	induced	by	the	surface	energetics.		},
DOI = {10.32604/icces.2023.09838}
}