AVS 51st International Symposium
    Surface Science Monday Sessions
       Session SS-MoP

Paper SS-MoP34
Nanotribological Effects of Hair Care Products and Materials on Wet and Dry Human Hair using AFM/IFM

Monday, November 15, 2004, 5:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: B. Bhushan, The Ohio Sate University
Authors: C. LaTorre, The Ohio State University
B. Bhushan, The Ohio Sate University
Correspondent: Click to Email
Tribological properties such as friction have been well studied for hair and other biological materials on the macroscale. Lower macroscale coefficient of friction values have been reported in literature for hair treated with various conditioning agents, as opposed to untreated virgin hair. The mechanisms behind lower friction with the application of conditioning products are understood on the macroscale level. However, the interactions between hair and hair care products that occur on the micro/nano scale and the tribological effects of these interactions are not as well understood. Major sources of investigation for treated hair includes localization of various conditioning products, mechanisms behind changes in friction and adhesion on the nanoscale due to conditioner agents, and how the products change the microstructure of the cuticle. The paper presents nanotribological studies investigating adhesion and friction using AFM/LFM. Test samples include Caucasian, Asian, and African hair at virgin and treated conditions in both wet and dry environments. Friction and adhesion measurements were taken using a Si@sub 3@N@sub 4@ tip and constant force mode in AFM/LFM. Friction force mapping provides insight into the localized change in friction caused by the application of hair care materials. Force-volume plots to study adhesion on the cuticle surface provide information about localization and change as well. A discussion is presented on these properties of hair as a function of ethnicity, wet and dry environments, and conditioning treatments.