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Autocorrelation and Multifractal Detrended Fluctuation Analyses Reveal Superdiffusive Mass Transport in Solvent-Filled Nanoporous Media.
Anal Chem
January 2025
Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, Texas 76019, United States.
Fluorescence fluctuation spectroscopy experiments were conducted to better understand the complex mass transport dynamics of organic molecules in liquid-filled nanoporous media. Anodic aluminum oxide (AAO) membranes incorporating 10 and 20 nm diameter cylindrical pores were employed as model materials. Nile red (NR) dye was used as a fluorescent tracer.
View Article and Find Full Text PDFRole of homeostatic plasticity in critical brain dynamics following focal stroke lesions.
Sci Rep
December 2024
Department of Neuroscience and Padova Neuroscience Center, Università di Padova, Padova, Italy.
Can focal brain lesions, such as those caused by stroke, disrupt critical brain dynamics? What biological mechanisms drive its recovery? In a recent study, we showed that focal lesions generate a sub-critical state that recovers over time in parallel with behavior (Rocha et al., Nat. Commun.
View Article and Find Full Text PDFNon-Hermitian Theory of Valley Excitons in Two-Dimensional Semiconductors.
Phys Rev Lett
December 2024
School of Physics and Electronics, Hunan University, Changsha 410082, China.
Electron-hole exchange interaction in two-dimensional transition metal dichalcogenides is extremely strong due to the dimension reduction, which promises valley-superposed excitonic states with linearly polarized optical emissions. However, strong circular polarization reflecting valley-polarized excitonic states is commonly observed in helicity-resolved optical experiments. Here, we present a non-Hermitian theory of valley excitons by incorporating optical pumping and intrinsic decay, which unveils an anomalous valley-polarized excitonic state with elliptically polarized optical emission.
View Article and Find Full Text PDFDynamics of nanoparticle tracers in supercooled nanoparticle matrices.
Soft Matter
December 2024
William A. Brookshire Department of Chemical and Biomolecular Engineering, University of Houston, 4226 Martin Luther King Boulevard, Houston, Texas, 77204-4004, USA.
We investigate the dynamics of tracer nanoparticles in bulk supercooled nanoparticle matrices using confocal microscopy. We mix fluorescent (tracer) and undyed (matrix) charged-stabilized polystyrene nanoparticles with tracer-to-matrix particle size ratios = 0.34, 0.
View Article and Find Full Text PDFCoarsening dynamics of aster defects in model polar active matter.
Soft Matter
December 2024
Centre for Condensed Matter Theory, Indian Institute of Science, Bangalore, Karnataka, India.
Article Synopsis
- - The study focuses on how topological defects in 2D polar active matter interact with a conserved density field, revealing unusual behavior in their distribution and movement patterns.
- - Defects initially pair-annihilate rapidly but then become stuck in a slower coarsening process, leading to a steady state defined by a power-law rate of change, unlike the typical exponential decay seen in equilibrium systems.
- - The unique defect coarsening creates specific patterns in the density field that resemble those found in biological systems, such as the actin cytoskeleton, potentially influencing cell signaling and biological functions.
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