Results 261 to 270 of about 577,267 (335)

Ultrasound‐Powered, Battery‐Free Implants via Triboelectric Energy Harvesting

open access: yesAdvanced Materials Technologies, EarlyView.
Ultrasound‐driven triboelectric nanogenerators (US‐TENGs) present a promising approach to battery‐free implants by combining body‐safe ultrasound with the material and structural versatility of TENGs. This review categorizes current US‐TENG research into long‐term and transient short‐term applications and discusses key challenges in materials, device ...
Youngwook Chung   +5 more
wiley   +1 more source

Rotary 4D Printing of Programmable Metamaterials on Sustainable 4D Mandrel

open access: yesAdvanced Materials Technologies, EarlyView.
The paper introduces open, rotary 4D printing of programmable tubular metamaterials. It presents an open, non‐planar path‐to‐G‐code pipeline and shape‐changing rotary mandrel that enable support‐free fabrication and multi‐stimuli actuation. Experiments and FEA validate the mentioned features and stress redistribution.
Hesam Soleimanzadeh   +4 more
wiley   +1 more source

Fiber Bragg Gratings with Micro‐Engineered Temperature Coefficients

open access: yesAdvanced Optical Materials, Volume 13, Issue 8, March 13, 2025.
Fiber Bragg gratings (FBGs) are intrinsically responsive to temperature and strain simultaneously. In this research, low‐loss FBGs with micro‐engineered temperature coefficients are fabricated, utilizing refractive index liquid‐filled microchannels in the cladding.
Zipei Song   +8 more
wiley   +1 more source

Competitive Bidirectional Response in Bi‐Polymeric Mechanochromic Cantilevers Toward Color Imaging‐Based VOC Discrimination

open access: yesAdvanced Optical Materials, EarlyView.
In bi‐polymeric mechanochromic cantilevers composed of polydimethylsiloxane (PDMS) and off‐stoichiometry thiol‐ene‐epoxy (OSTE+), differential swelling between the two polymers in response to VOC exposure induces a competitive bidirectional bending and corresponding color changes, with three characteristic response modes related to the Hansen ...
Ferran Pujol‐Vila   +2 more
wiley   +1 more source

Record Negative Photoconductivity in N‐Polar AlGaN/GaN Quantum‐Well Heterostructures

open access: yesAdvanced Photonics Research, EarlyView.
The negative photoconductivity (NPC) effect is experimentally observed in the N‐polar AlGaN/GaN quantum‐well heterostructures after introduction of a GaN/AlN superlattice back barrier. The NPC phenomenon appears in the N‐polar AlGaN/GaN quantum‐well heterostructures under infrared light illumination at room temperature.
Maciej Matys   +3 more
wiley   +1 more source

Impact of System‐Model Mismatch in Fourier Ptychographic Microscopy

open access: yesAdvanced Photonics Research, EarlyView.
This study investigates the robustness of Fourier ptychography microscope (FPM) reconstruction algorithms across various scenarios, each representing challenges encountered in practical FPM experiments, and deduces the extent to which FPM can provide diffraction‐limited resolution under the influence of various sources of error.
Tuo Yin   +4 more
wiley   +1 more source

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