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            <title xml:lang="en">Nanomechanics of single keratin fibres: A Raman study of the α helix -&gt; β sheet transition and water effect</title>
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                <term xml:lang="en">Raman spectroscopy</term>
                <term xml:lang="en">keratin</term>
                <term xml:lang="en">fibres</term>
                <term xml:lang="en">hair</term>
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              <p>The use of micro-Raman spectroscopy, through chemical bond nano-scale probes, allows the changes in conformations (α helix -&gt; β sheet), chain orientation, disconnection of disulfide bonds (-20%) and the increase of intra and inter-chain distances during the strain to be distinguished. The combination of micro-Raman spectroscopy and a allows a quantitative measure of the extension of chemical bonds in the peptidic chain during loading. The nano-structural transformations of keratin during the strain of human hair in a dry environment (40-60 % relative humidity) and saturated with water have been studied. The water permits the sliding of the chains and decreases the bond energy hair. Spectral analyses and 2D correlation are two coherent and independent methods to follow change the Raman probes which are sensitive to structural . The between nano-mechanical (Raman) and micro-mechanical (strain/stress) analyses confirms the validity of the experimental results, tools and principles used, as well as the agreement with the structural model of keratin fibres described by Chapman &amp; Hearle.</p>
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