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| http://dx.doi.org/10.1097/GOX.0000000000001917 | DOI Listing |
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The 2-layer elasto-visco-plastic rheological model for the material parameter identification of bone tissue extended by a damage law.
J Mech Behav Biomed Mater
February 2024
Department of Anatomy and Biomechanics, Karl Landsteiner University of Health Sciences, Austria; Institute of Lightweight Design and Structural Biomechanics, Vienna University of Technology, Austria.
The response of bone tissue to mechanical load is complex and includes plastic hardening, viscosity and damage. The quantification of these effects plays a mayor role in bone research and in biomechanical clinical trials as to better understand related diseases. In this study, the damage growth in individual wet human trabeculae subjected to cyclic overloading is quantified by inverse rheological modeling.
View Article and Find Full Text PDFRevealing the interlayer van der Waals coupling of bi-layer and tri-layer MoS using terahertz coherent phonon spectroscopy.
Photoacoustics
December 2022
Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan.
In this research, we applied THz coherent phonon spectroscopy to optically probe the vibrational modes of the epitaxially-grown bi-layer and tri-layer MoS on sapphire substrate. The layers' THz vibration is displacively stimulated and temporally retrieved by near-UV femtosecond laser pulses, revealing Raman-active and Raman-inactive modes in one measurement. With the complete breathing modes revealed, here we extend the linear chain model by considering the elastic contact with the substrate and vdWs coupling of the next nearest MoS layer to analyze the effective spring constants.
View Article and Find Full Text PDFThermodynamically Driven Formation of Intercalated Cu Carpets from Supported Cu Pyramids on MoS.
J Phys Chem Lett
July 2022
Ames National Laboratory, Ames, Iowa 50011, United States.
Thermodynamic and kinetic analyses based on our first-principles density functional theory calculations are used to interpret the experimentally observed formation of Cu carpets intercalated under the top layer of a 2-MoS substrate. Spontaneous Cu transport from Cu pyramids on top of the MoS substrate through surface point defects to the growing Cu carpet is shown to be driven by a slightly lower chemical potential for the Cu carpet. We demonstrate that the competition between a preference for a thicker Cu carpet and the cost of elastic stretching of the top MoS layer results in a selected Cu carpet thickness.
View Article and Find Full Text PDFAntibacterial Activity Studies of 3D-Printing Polyetheretherketone Substrates with Surface Growth of 2D TiO/ZnO Rodlike Arrays.
ACS Omega
March 2022
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
Heterogeneous metal implants have been applied in clinical treatments of skeletal wounds, but their low antibacterial properties and the possibility of a release of metal ions may have harmful influences on the human body. Therefore, a polymer implant with low cost, high safety, an elastic modulus similar to that of human bone, and a good antibacterial property must be produced for orthopedic treatments. In this study, the surface of a 3D-printed polyetheretherketone (PEEK) disk was grown with ZnO/TiO rodlike arrays using a chemical bath deposition.
View Article and Find Full Text PDFA parameter reduced adaptive quasi-linear viscoelastic model for soft biological tissue in uniaxial tension.
J Mech Behav Biomed Mater
February 2022
TU Wien, Institute of Lightweight Design and Structural Biomechanics, Gumpendorfer Straße 7, 1060, Vienna, Austria; Karl Landsteiner University of Health Sciences, Department of Anatomy and Biomechanics, Division Biomechanics, Dr. Karl-Dorrek-Straße 30, 3500, Krems, Austria. Electronic address:
Mechanical characterisation of soft viscous materials is essential for many applications including aerospace industries, material models for surgical simulation, and tissue mimicking materials for anatomical models. Constitutive material models are, therefore, necessary to describe soft biological tissues in physiologically relevant strain ranges. Hereby, the adaptive quasi-linear viscoelastic (AQLV) model enables accurate modelling of the strain-dependent non-linear viscoelastic behaviour of soft tissues with a high flexibility.
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