ISIS Neutron and Muon Source Data Journal

Molecular Origin of ?kyu-kyu? in Detergency: Interaction of Surfactants with Model Stratum Corneum Liposomes

Abstract: 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. Here, continuing on previous work in collaboration with Procter & Gamble, we propose a small angle neutron scattering (SANS) study of model stratum corneum (SC) liposomes and their interactions with common surfactants, SDS and DDAO (dodecyldimethylamine oxide), which are analogues of the surfactants used in P&G formulation. The SC lipid system comprises equimolar mixtures of ceramide N-lignoceroyl-D-erythro-sphingosine (Cer24NS)/free fatty acid (FFA)/cholesterol (Chol). The results will complement our direct measurement of friction between skin-mimics and a contacting surface, mediated by mixed surfactant systems.

Experimenter: Dr Magdalena Wlodek
Experimenter: Miss Charlotte Kenton
Experimenter: Professor Wuge Briscoe
Experimenter: Mr Oliver McDowell
Experimenter: Miss Xueying Guo
Experimenter: Mr Matteo Fois
Local Contact: Dr Leide Cavalcanti
Experimenter: Mr Tao Ma

DOI: 10.5286/ISIS.E.RB2310502

ISIS Experiment Number: RB2310502

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Dr Magdalena Wlodek et al; (2023): Molecular Origin of ?kyu-kyu? in Detergency: Interaction of Surfactants with Model Stratum Corneum Liposomes, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2310502

Data is released under the CC-BY-4.0 license.