Document Detail

Investigation of scale effects and directionality dependence on friction and adhesion of human hair using AFM and macroscale friction test apparatus.
MedLine Citation:
PMID:  16675116     Owner:  NLM     Status:  MEDLINE    
Macroscale testing of human hair tribological properties has been widely used to aid in the development of better shampoos and conditioners. Recently, literature has focused on using the atomic force microscope (AFM) to study surface roughness, coefficient of friction, adhesive force, and wear (tribological properties) on the nanoscale in order to increase understanding about how shampoos and conditioners interact with the hair cuticle. Since there are both similarities and differences when comparing the tribological trends at both scales, it is thus recognized that scale effects are an important aspect of studying the tribology of hair. However, no microscale tribological data for hair exists in literature. This is unfortunate because many interactions between hair-skin, hair-comb, and hair-hair contact takes place at microasperities ranging from a few mum to hundreds of mum. Thus, to bridge the gap between the macro- and nanoscale data, as well as to gain a full understanding of the mechanisms behind the trends, it is now worthwhile to look at hair tribology on the microscale. Presented in this paper are coefficient of friction and adhesive force data on various scales for virgin and chemically damaged hair, both with and without conditioner treatment. Macroscale coefficient of friction was determined using a traditional friction test apparatus. Microscale and nanoscale tribological characterization was performed with AFM tips of various radii. The nano-, micro-, and macroscale trends are compared and the mechanisms behind the scale effects are discussed. Since the coefficient of friction changes drastically (on any scale) depending on whether the direction of motion is along or against the cuticle scales, the directionality dependence and responsible mechanisms are discussed.
Carmen LaTorre; Bharat Bhushan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-04-18
Journal Detail:
Title:  Ultramicroscopy     Volume:  106     ISSN:  0304-3991     ISO Abbreviation:  Ultramicroscopy     Publication Date:    2006 Jun-Jul
Date Detail:
Created Date:  2006-07-10     Completed Date:  2006-11-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7513702     Medline TA:  Ultramicroscopy     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  720-34     Citation Subset:  IM    
Nanotribology Laboratory for Information Storage and MEMS/NEMS, NLIM, The Ohio State University, Suite 255, 650 Ackerman Road, Columbus, 43202, USA.
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MeSH Terms
Hair / chemistry*,  ultrastructure
Hair Preparations
Microscopy, Atomic Force
Reg. No./Substance:
0/Hair Preparations

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