Increased molecular mobility in humid silk fibers under tensile stress
Seydel, Tilo ; Knoll, Wiebke ; Greving, Imke ; Dicko, Cedric LU
; Koza, Michael M
; Krasnov, Igor
and Müller, Martin
(2011)
In Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
83(1 Pt 2).
p.016104-016104
- Abstract
Silk fibers are semicrystalline nanocomposite protein fibers with an extraordinary mechanical toughness that changes with humidity. Diffusive or overdamped motion on a molecular level is absent in dry silkworm silk, but present in humid silk at ambient temperature. This microscopic diffusion distinctly depends on the externally applied macroscopic tensile force. Quasielastic and inelastic neutron-scattering data as a function of humidity and of tensile strain on humid silk fibers support the model that both the adsorbed water and parts of the amorphous polymers participate in diffusive motion and are affected by the tensile force. It is notable that the quasielastic linewidth of humid silk at 100% relative humidity increases... (More)
Silk fibers are semicrystalline nanocomposite protein fibers with an extraordinary mechanical toughness that changes with humidity. Diffusive or overdamped motion on a molecular level is absent in dry silkworm silk, but present in humid silk at ambient temperature. This microscopic diffusion distinctly depends on the externally applied macroscopic tensile force. Quasielastic and inelastic neutron-scattering data as a function of humidity and of tensile strain on humid silk fibers support the model that both the adsorbed water and parts of the amorphous polymers participate in diffusive motion and are affected by the tensile force. It is notable that the quasielastic linewidth of humid silk at 100% relative humidity increases significantly with the applied force. The effect of the tensile force is discussed in terms of an increasing alignment of the polymer chains in the amorphous fraction with increasing tensile stress which changes the geometrical restrictions of the diffusive motions.
(Less)
- author
- Seydel, Tilo
; Knoll, Wiebke
; Greving, Imke
; Dicko, Cedric
LU
; Koza, Michael M
; Krasnov, Igor
and Müller, Martin
- publishing date
- 2011-01
- type
- Contribution to journal
- publication status
- published
- in
- Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
- volume
- 83
- issue
- 1 Pt 2
- pages
- 016104 - 016104
- publisher
- American Physical Society
- external identifiers
-
- scopus:78751528850
- pmid:21405741
- ISSN
- 1539-3755
- DOI
- 10.1103/PhysRevE.83.016104
- language
- English
- LU publication?
- no
- id
- c46dbbd9-cdff-4c17-a093-9de37951c270
- date added to LUP
- 2019-06-28 00:27:44
- date last changed
- 2024-03-19 15:42:24
@article{c46dbbd9-cdff-4c17-a093-9de37951c270,
abstract = {{<p>Silk fibers are semicrystalline nanocomposite protein fibers with an extraordinary mechanical toughness that changes with humidity. Diffusive or overdamped motion on a molecular level is absent in dry silkworm silk, but present in humid silk at ambient temperature. This microscopic diffusion distinctly depends on the externally applied macroscopic tensile force. Quasielastic and inelastic neutron-scattering data as a function of humidity and of tensile strain on humid silk fibers support the model that both the adsorbed water and parts of the amorphous polymers participate in diffusive motion and are affected by the tensile force. It is notable that the quasielastic linewidth of humid silk at 100% relative humidity increases significantly with the applied force. The effect of the tensile force is discussed in terms of an increasing alignment of the polymer chains in the amorphous fraction with increasing tensile stress which changes the geometrical restrictions of the diffusive motions.</p>}},
author = {{Seydel, Tilo and Knoll, Wiebke and Greving, Imke and Dicko, Cedric and Koza, Michael M and Krasnov, Igor and Müller, Martin}},
issn = {{1539-3755}},
language = {{eng}},
number = {{1 Pt 2}},
pages = {{016104--016104}},
publisher = {{American Physical Society}},
series = {{Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}},
title = {{Increased molecular mobility in humid silk fibers under tensile stress}},
url = {{http://dx.doi.org/10.1103/PhysRevE.83.016104}},
doi = {{10.1103/PhysRevE.83.016104}},
volume = {{83}},
year = {{2011}},
}