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Recirculatory Solvotaxis of a Nematic Droplet on Water Surface Enabling Miniaturization.
Langmuir
January 2025
Department of Chemical Engineering, Indian Institute of Technology, Guwahati 781039, Assam, India.
Self-organized contact line instabilities (CLI) of a macroscopic liquid crystal (LC) droplet can be an ingenious pathway to generate a large collection of miniaturized LC drops. For example, when a larger drop of volatile solvent (e.g.
View Article and Find Full Text PDFHighly efficient electroplating of (220)-oriented nano-twinned copper in methanesulfonic copper baths.
Mater Horiz
January 2025
Department of Chemical Engineering, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsin-Chu 300044, Taiwan.
The formation of a high-density nanotwinned structure in copper deposits is presently acknowledged as a paramount goal for enhancing the material characteristics of copper. However, the conventional manufacturing processes often involve the incorporation of organic additives, resulting in consequential impurity effects and aging concerns. In this work, we introduce a high-rate approach to fabricate (220)-orientation nanotwinned copper foils in a concentrated methanesulfonate copper solution with mere amount of chloride ions as additives.
View Article and Find Full Text PDFChiral π domain walls composed of twin half-integer surface disclinations in ferroelectric nematic liquid crystals.
Proc Natl Acad Sci U S A
December 2024
Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
Ferroelectric nematic liquid crystals are polar fluids characterized by microscopic orientational ordering and macroscopic spontaneous polarizations. Within these fluids, domain walls that separate regions of different polarizations are ubiquitous. We demonstrate that the π walls in films of the polar fluids consist of twin half-integer surface disclinations spaced horizontally, enclosing a subdomain where the polarization exhibits left- or right-handed π twists across the film.
View Article and Find Full Text PDFElectrodeposition of Cu nanowires with ultrahigh-density twin boundaries: an electrochemical perspective on nanotwinning.
Nanoscale
January 2025
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan.
Many spectacular nanotwinned Cu (nt-Cu) properties depend on the spacing of adjacent twin boundaries (TBs) inside crystal grains. The average TB spacing is typically 10-100 nm in electrodeposited nt-Cu films. This study employed template-assisted electrodeposition to grow nt-Cu nanowires with high-density TBs (average TB spacing <5 nm).
View Article and Find Full Text PDFAerodynamic Analysis of Rotor Spacing and Attitude Transition in Tilt-Powered Coaxial Rotor UAV.
Sensors (Basel)
November 2024
Science and Technology on Electromechanical Dynamic Control Laboratory, Xi'an 710065, China.
Complex aerodynamic characteristics and optimal control during the attitude transition of tilt-powered coaxial twin-rotor unmanned aerial vehicles (UAVs) represent key challenges in flight control design. This study investigates aerodynamic mechanisms and control parameter optimization during the transition of UAVs from vertical to forward flight. By establishing a dynamic model and combining theoretical and numerical analyses, the optimal rotor spacing is determined to be h = 0.
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