Mechanical Properties of cellulose fibers measured by Brillouin spectroscopy
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
Standard
in: Cellulose, Jahrgang 27.2020, Nr. 8, 02.03.2020, S. 4209-4220.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
Harvard
APA
Vancouver
Author
Bibtex - Download
}
RIS (suitable for import to EndNote) - Download
TY - JOUR
T1 - Mechanical Properties of cellulose fibers measured by Brillouin spectroscopy
AU - Elsayad, Kareem
AU - Urstoeger, Georg
AU - Czibula, Caterina
AU - Teichert, Christian
AU - Gumulec, Jaromir
AU - Balvan, Jan
AU - Pohlt, Michael
AU - Hirn, Ulrich
PY - 2020/3/2
Y1 - 2020/3/2
N2 - We investigate the potential of Brillouin Light Scattering (BLS) Microspectroscopy for fast non-invasive all-optical assessment of the mechanical properties of viscose fibers and bleached softwood pulp. Using an optimized Brillouin spectrometer, we demonstrate fast spatial mapping of the complex longitudinal modulus over extended areas (> 100 µm). Our results reveal that while the softwood pulp has a relatively uniform moduli, the viscous fibers have significant spatial heterogeneous in the moduli. Specifically, the viscose fibers exhibited a regular pattern of increasing and decreasing modulus normal to the fiber axis. The potential influence of a locally changing refractive index is investigated by holographic phase microscopy and ruled out. We discuss our results in light of the anisotropic mechanical properties of the fibers and are able to estimate the relative difference between the modulus along the fiber axis and that perpendicular to it. Results are presented alongside reference measurements of the quasi-static mechanical properties transverse to the fiber axes obtained using AFM-nanoindentation which reveal a similar trend, hinting at the potential usefulness of BLS for mechanical characterization applications. However, more detailed investigations are called for to uncover all the factors influencing the measured high-frequency BLS modulus and its significance in relation to physical properties of the fiber that may be of practical interest.
AB - We investigate the potential of Brillouin Light Scattering (BLS) Microspectroscopy for fast non-invasive all-optical assessment of the mechanical properties of viscose fibers and bleached softwood pulp. Using an optimized Brillouin spectrometer, we demonstrate fast spatial mapping of the complex longitudinal modulus over extended areas (> 100 µm). Our results reveal that while the softwood pulp has a relatively uniform moduli, the viscous fibers have significant spatial heterogeneous in the moduli. Specifically, the viscose fibers exhibited a regular pattern of increasing and decreasing modulus normal to the fiber axis. The potential influence of a locally changing refractive index is investigated by holographic phase microscopy and ruled out. We discuss our results in light of the anisotropic mechanical properties of the fibers and are able to estimate the relative difference between the modulus along the fiber axis and that perpendicular to it. Results are presented alongside reference measurements of the quasi-static mechanical properties transverse to the fiber axes obtained using AFM-nanoindentation which reveal a similar trend, hinting at the potential usefulness of BLS for mechanical characterization applications. However, more detailed investigations are called for to uncover all the factors influencing the measured high-frequency BLS modulus and its significance in relation to physical properties of the fiber that may be of practical interest.
KW - Storage modulus
KW - Young's modulus
KW - Loss modulus
KW - Brillouin spectroscopy
KW - Viscoelasticity
KW - Cellulose fiber
KW - Mechanical Properties
KW - cellulose fibers
KW - Brillouin spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85080981988&partnerID=8YFLogxK
U2 - 10.1007/s10570-020-03075-z
DO - 10.1007/s10570-020-03075-z
M3 - Article
VL - 27.2020
SP - 4209
EP - 4220
JO - Cellulose
JF - Cellulose
SN - 0969-0239
IS - 8
ER -