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Highly Efficient, Electro-thermal Heater Based on Marangoni-Driven, Oriented Reduced Graphene Oxide/Poly(ether imide) Nanolaminates.
ACS Appl Mater Interfaces
January 2025
Institute of Chemical Engineering Sciences, Foundation of Research and Technology- Hellas (FORTH/ICE-HT), Stadiou Street, Platani, Patras 26504, Greece.
Due to their outstanding electrical and thermal properties, graphene and related materials have been proposed as ideal candidates for the development of lightweight systems for thermoelectric applications. Recently, the nanolaminate architecture that entails alternation of continuous graphene monolayers and ultrathin polymer films has been proposed as an efficient route for the development of composites with impressive physicochemical properties. In this work, we present a novel layer-by-layer approach for the fabrication of highly ordered, flexible, heat-resistant, and electrically conductive freestanding graphene/polymer nanolaminates through alternating Marangoni-driven self-assembly of reduced graphene oxide (rGO) and poly(ether imide) (PEI) films.
View Article and Find Full Text PDFFamily Medicine Practice as Learning Environment: A Medical Student Evaluation in Switzerland.
Adv Med Educ Pract
December 2024
Institute of Primary Care, University of Zurich and University Hospital of Zurich, Zurich, Switzerland.
Introduction: Improving the quality of teaching placements in family medicine practice (FMP) could help to address the shortage of primary care physicians. This study aims to investigate students' evaluations of first-exposure FMP placements, to identify clusters of FMPs that might need to improve their placement quality, and to analyze students' perceptions of the FMP as a learning environment.
Methods: The design was a cross-sectional survey study, including all fourth-year undergraduate medical students at the University of Zurich, Switzerland, who completed a mandatory placement in FMP during 2019-2022.
High-performance infrared light sources have significantly influenced the fields of photonics and optoelectronics. However, achieving infrared light emission with low energy consumption, high brightness, and rapid response remains a huge challenge. Single-walled carbon nanotubes (SWCNTs) could be an important candidate for infrared light emitters because of their superior electron mobility and phonon transport efficiency.
View Article and Find Full Text PDFOligoadenine Strand Functionalized Polyacrylamide Hydrogel Film Exhibiting pH-Triggered High-Degree Inverse Shape Deformations.
Chembiochem
December 2024
Nankai University, Analytical Sciences, No. 94, Weijin Road, 300071, Tianjin, CHINA.
Smart shape-memory DNA hydrogels, which can respond to various types of external stimuli and undergo macroscopic shape deformations, have shown great potential in various applications. By constructing free-standing films, the deformation and response properties of these hydrogels can be further enhanced, and visualized deformation can be achieved. However, DNA hydrogels that can exhibit rapid and high-degree shape deformations, such as the inverse shape deformations, are still lacking.
View Article and Find Full Text PDFCarbon Nanostructures Derived from In Situ Grown ZIF Nanocages within Bacterial Cellulose for AC-Filtering Electrochemical Capacitors.
Small
December 2024
School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ, 85281, USA.
Article Synopsis
- Electrochemical capacitors (ECs) provide better energy storage performance than traditional capacitors, but struggle with AC filtering due to balancing response speed and capacitance.
- A new freestanding carbon electrode made from bacterial cellulose and embedded with zeolitic imidazolate framework (ZIF-8) shows low resistance and high capacitance, even at high frequencies.
- Stacking the electrodes improves capacitance further and maintains good performance up to 50 kHz, while connecting units in series increases their voltage range, making them ideal candidates for advanced electronic uses.
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