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Anomalous entropy-driven kinetics of dislocation nucleation.
Nat Commun
January 2025
Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, USA.
The kinetics of dislocation reactions, such as dislocation multiplication, controls the plastic deformation in crystals beyond their elastic limit, therefore critical mechanisms in a number of applications in materials science. We present a series of large-scale molecular dynamics simulations that shows that one such type of reactions, the nucleation of dislocation at free surfaces, exhibit unconventional kinetics, including unexpectedly large nucleation rates under compression, very strong entropic stabilization under tension, as well as strong non-Arrhenius behavior. These unusual kinetics are quantitatively rationalized using a variational transition state theory approach coupled with an efficient numerical scheme for the estimation of vibrational entropy changes.
View Article and Find Full Text PDFEnhancing compatibility of polylactic acid and lignin through acetylation for improving controlled release of pesticide.
Pest Manag Sci
January 2025
College of Chemistry and Chemical Engineering, Guangxi University, Nanning, China.
Background: Improving the compatibility between polylactic acid (PLA) and lignin is crucial for developing innovative PLA-based controlled release systems for pesticides. This study addresses the challenge of enhancing the compatibility of alkali lignin (AL) with PLA by acetylated lignin (ACL). The main aim is to synthesize and evaluate pesticide-loaded microspheres for controlled release performance using fluazinam (FZ) as the model pesticide.
View Article and Find Full Text PDFFabrication of glipizide loaded polymeric microparticles; in-vitro and in-vivo evaluation.
PLoS One
January 2025
Faculty of Pharmacy, Sardar Bahadur Khan Women University Quetta, Quetta, Pakistan.
Controlled-release microparticles offer a promising avenue for enhancing patient compliance and minimizing dosage frequency. In this study, we aimed to design controlled-release microparticles of Glipizide utilizing Eudragit S100 and Methocel K 100 M polymers as controlling agents. The microparticles were fabricated through a simple solvent evaporation method, employing various drug-to-polymer ratios to formulate different controlled-release batches labeled as F1 to F5.
View Article and Find Full Text PDFInteraction Renormalization and Validity of Kinetic Equations for Turbulent States.
Phys Rev Lett
December 2024
Weizmann Institute of Science, Rehovot 7610001, Israel.
We consider turbulence of waves interacting weakly via four-wave scattering (sea waves, plasma waves, spin waves, etc.). In the first order in the interaction, a closed kinetic equation has stationary solutions describing turbulent cascades.
View Article and Find Full Text PDFTrajectory analysis of anomalous dynamics in optical lattice.
J Chem Phys
January 2025
School of Physics, Shandong University, Jinan 250100, China.
We apply the trajectory formulation to analyze the anomalous dynamics of cold atoms in an optical lattice. The phase space probability density function of cold atoms, their dynamics, and the mechanism of dynamic evolution from an initial Gaussian distribution to a power-law distribution are analyzed. The results of the trajectory formulation are in good agreement with the previously reported experimental results for the exponent of position variance for a long time and the position-momentum correlation.
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