TY - JOUR
T1 - Open Problems in Wetting Phenomena
T2 - Pinning Retention Forces
AU - Tadmor, Rafael
N1 - Funding Information:
The manuscript benefitted from excellent discussions with H.-J. Butt, C. H. Choi, D. Vollmer, H. Mishra, and S. Griffiths. This study was supported by NSF grants CMMI-1405109, CBET-1428398, and CBET-0960229 and supported in part at the Technion by a fellowship from the Lady Davis Foundation and by the Israeli Ministry of Energy.
Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/6/1
Y1 - 2021/6/1
N2 - We review existing explanations for drop pinning and the origin of the force required to initiate the sliding of a drop on a solid surface (depinning). Theories that describe these phenomena include de Gennes', Marmur's, Furmidge's, the related Furmidge-Extrand's, and Tadmor's theory. These theories are all well cited but generally do not address each other, and usually papers that cite one of them ignore the others. Here, we discuss the advantages and disadvantages of these theories and their applicability to different experimental systems. Thus, we link different experimental systems to the theories that describe them best. We describe the force laws that can be deduced should these theories be united and the major open problems that remain. We describe a physical meaning that can be extracted from retention force measurements, specifically, the interfacial modulus that describes the tendency of a solid to conform to the liquid. This has implications for various wetting phenomena such as adhesion robustness, drug penetration into biological tissues, and solid robustness/resilience versus solid degradation over time as a result of its contact with a liquid.
AB - We review existing explanations for drop pinning and the origin of the force required to initiate the sliding of a drop on a solid surface (depinning). Theories that describe these phenomena include de Gennes', Marmur's, Furmidge's, the related Furmidge-Extrand's, and Tadmor's theory. These theories are all well cited but generally do not address each other, and usually papers that cite one of them ignore the others. Here, we discuss the advantages and disadvantages of these theories and their applicability to different experimental systems. Thus, we link different experimental systems to the theories that describe them best. We describe the force laws that can be deduced should these theories be united and the major open problems that remain. We describe a physical meaning that can be extracted from retention force measurements, specifically, the interfacial modulus that describes the tendency of a solid to conform to the liquid. This has implications for various wetting phenomena such as adhesion robustness, drug penetration into biological tissues, and solid robustness/resilience versus solid degradation over time as a result of its contact with a liquid.
UR - http://www.scopus.com/inward/record.url?scp=85107391236&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.0c02768
DO - 10.1021/acs.langmuir.0c02768
M3 - Article
C2 - 34008988
AN - SCOPUS:85107391236
SN - 0743-7463
VL - 37
SP - 6357
EP - 6372
JO - Langmuir
JF - Langmuir
IS - 21
ER -