Molecular origin of “kyu-kyu” in detergency: Composition of SDS/DDAO mixed micelles and interfacial layers
In the context of dishwashing, the acoustic emissions derived by the physical contact of the human fingertip across a wet lubricated surface (or dish) are defined by the Japanese term, ‘kyu-kyu’. These ‘kyu-kyu’ or squeaking sounds, indicative of customer satisfaction of a cleaned surface, have their origin in a physical phenomenon known as stick-slip friction. We hypothesize that this stick-slip, facilitated by the presence of a detergent, is caused in part by disruption of the surfactant bilayer absorbed to the contacting surface as rinsing occurs. The friction force may be mediated by the presence of mixed micelles, polymer additives, soils and skin lipids (Fig. 1). Here as the first step of a 4-year PhD project in collaboration with P&G, we propose a combined small-angle neutron scattering (SANS) and neutron reflectivity (NR) study of the self-assembled structures in solution and at interfaces formed by two surfactants. The surfactants, SDS and DDAO (dodecyldimethylamine oxide) are analogues of the surfactants used in the P&G formulation and widely reported to exhibit significant synergy, forming mixed micelles of compositionally dependent structure.
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BRISCOE WUGE H; FEHER Bence; GUO Xueying; GUTFREUND Philipp; Charlotte Kenton; KONOVALOV Oleg; Armando Maestro; MICCIULLA Samantha; RUBIO ANDRES Antonio; SLASTANOVA Anna; STEVENS Michael and WLODEK Magdalena. (2021). Molecular origin of “kyu-kyu” in detergency: Composition of SDS/DDAO mixed micelles and interfacial layers. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1662
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