Results 201 to 210 of about 37,826 (288)

Surface Locomotion of Cell‐Sized Microrobots Subject to Adhesive Heterogeneity

open access: yesSmall, EarlyView.
Chemically powered, cell‐sized microrobots exhibit translational, circular, or spiral motion through a balance among self‐phoretic propulsion, drag, gravity, and heterogeneous surface interactions. Experiments show that microrobot design and substrate conditions regulate both mobility and trajectory type.
Byung Ha Kang   +3 more
wiley   +1 more source

Morphological Stabilization of CsPbBr3 Quantum Dot Films Enabled by PVC‐g‐PMMA Graft Copolymer Encapsulation for Water‐Robust Color Conversion

open access: yesSmall, EarlyView.
Poly(vinyl chloride)‐graft‐poly(methyl methacrylate) encapsulation enabled formation of water‐stable CsPbBr3‐quantum‐dot fims with enhanced photoluminescence (PL) retention upon exposure to water, UV radiation, and ethanol. Time‐dependent ex situ transmission electron microscopy with quantitative particle segmentation identified the coefficient of ...
Seung Ryeol Song   +6 more
wiley   +1 more source

Unraveling the Proton‐Induced Degradation Mechanism in Quantum‐Dots Light‐Emitting Diode for Space Applications

open access: yesSmall, EarlyView.
Low‐energy proton irradiation induces ligand detachment at the QD/ZnO interface in quantum‐dot light‐emitting diodes (QLEDs). The exposed ZnS surface interacts with ZnO defects, generating a high density of interfacial trap states that promote electron trapping, suppress charge injection, and accelerate non‐radiative recombination, ultimately leading ...
Chanwoo Lim   +13 more
wiley   +1 more source

A 4D‐STEM Tomographic Framework Assisted by Object Tracking for Nanoparticle Structure Determination

open access: yesSmall Methods, EarlyView.
4D‐STEM tomography is used as a new methodology for 3D ED data acquisition to solve structures. Object tracking and segmentation methods are applied for the extraction of 3D ED datasets from regions of interest in a 4D‐STEM tomogram. Owing to its nanometric resolution, 4D‐STEM tomography can tackle challenging samples being too small for 3D ED, have ...
Saleh Gholam   +8 more
wiley   +1 more source

Understanding STEM Coursetaking Among English Learner Subgroups: Longitudinal Evidence From Four State Policy Contexts

open access: yesTESOL Quarterly, EarlyView.
Abstract Although a substantial body of research documents the problem of course tracking for students classified as English learners (ELs), very little work has addressed the notably different challenges that subgroups of ELs face across different state policy contexts.
Kristin E. Black   +7 more
wiley   +1 more source

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