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Determination of the degree of sulfonation in cross-linked and non-cross-linked Poly(ether ether ketone) using different analytical techniques.
Heliyon
January 2025
Division of Polymer Chemistry, Department of Chemistry, Atomic Energy Commission, P.O. Box: 6091, Damascus, Syrian Arab Republic.
The degree of sulfonation (DS) is a key property of sulfonated polymers, as it significantly influences their swelling behaviour, conductivity and mechanical properties. Accurately determining the DS is essential for optimizing these materials for various applications. In this work, the DS of sulfonated poly (ether ether ketone) (SPEEK) was evaluated using a combination of analytical techniques, including titration, back titration, Fourier Transform Infrared (FTIR), Ultra-Violet (UV) and proton nuclear magnetic resonance (H NMR) spectroscopies, Thermogravimetric analysis (TGA), Rutherford backscattering (RBS) and particle induced X-ray emission (PIXE) analysis.
View Article and Find Full Text PDFMorphology-Transport Coupling and Dissipative Structures in PEO-PS+LiTFSI Electrolytes In-Operando Conditions.
ACS Appl Mater Interfaces
January 2025
Institute for Theoretical Physics, Georg-August University of Göttingen, 37077 Göttingen, Germany.
A Single-Chain-in-Mean-Field (SCMF) algorithm was introduced to study block copolymer electrolytes in nonequilibrium conditions. This method self-consistently combines a particle-based description of the polymer with a generalized diffusion equation for the ionic fluxes, thus exploiting the time scale separation between fast ion motion and the slow polymer relaxation and self-assembly. We apply this computational method to study ion fluxes in electrochemical cells containing poly(ethylene oxide)-polystyrene (PEO-PS) block copolymers with added lithium salt.
View Article and Find Full Text PDFThe effect of bone relaxation on the simulated pull-off force of a cementless femoral knee implant.
J Biomech
January 2025
Radboudumc, Orthopaedic Research Lab, PO Box 9101, 6500 HB Nijmegen, the Netherlands.
Aseptic loosening is the primary cause of revision in cementless total knee arthroplasty (TKA), emphasizing the importance of strong initial stability for long-term implant success. Pre-clinical evaluations are crucial for understanding implant fixation mechanics and improving implant designs. Finite element (FE) analysis models often use linear elastic bone material models, which do not accurately reflect bone's mechanical behavior.
View Article and Find Full Text PDFBlind-label subwavelength ultrasound imaging.
Sci Adv
January 2025
Department of Electrical and Computer Engineering, University of Wisconsin-Madison, 3436 Engineering Hall, 1415 Engineering Drive, Madison, WI 53706, USA.
There is a long-existing trade-off between the imaging resolution and penetration depth in acoustic imaging caused by the diffraction limit. Most existing approaches addressing this trade-off require controlled "labels," i.e.
View Article and Find Full Text PDFAnalytical Model for Atomic Relaxation in Twisted Moiré Materials.
Phys Rev Lett
December 2024
National University of Singapore, Department of Materials Science and Engineering, 9 Engineering Drive 1, Singapore 117575.
By virtue of being atomically thin, the electronic properties of heterostructures built from two-dimensional materials are strongly influenced by atomic relaxation. The atomic layers behave as flexible membranes rather than rigid crystals. Here we develop an analytical theory of lattice relaxation in twisted moiré materials.
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