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Encapsulation of Oil Droplets Using Film-Forming Janus Nanoparticles.
Langmuir
January 2025
School of Chemistry, Key Centre for Polymers and Colloids, The University of Sydney, Sydney, New South Wales 2006, Australia.
Polymer Janus nanoparticles with one hard cross-linked polystyrene lobe and one soft film-forming poly(methyl methacrylate--butyl acrylate) lobe were synthesized by reversible addition-fragmentation chain transfer (RAFT)-mediated emulsion polymerization. The Janus nanoparticles adsorbed to oil/water and air/water interfaces, where the soft lobes coalesced, forming films of thickness between 25 and 250 nm; droplets of silicone oil could be stably encapsulated in polymer in this way. When prepared by mechanical mixing without additives, capsules of diameter 5-500 μm could be prepared, and with additives and application of heat, capsules of diameter around 5 μm were achieved, even with highly viscous silicone oil (20,000 cSt).
View Article and Find Full Text PDFLarge Electromechanical Response and Field-Induced Shape Memory Effect in Ferroelectric Ceramics.
Adv Sci (Weinh)
January 2025
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
Electric-field-induced shape memory effect has potential applications in electromechanical actuator. Here, this study proposes the a phase structure design routine in (1-x)(75NaBiTiO-25SrTiO)-xPbTiO ceramics to obtain large electromechanical response and shape memory effect. It is found that the shape memory effect is closely related to the bending deformation induced by asymmetric polarization between positive and negative electrodes, which is resulted from the reductions of Bi and Pb because of electron injection from negative electrode.
View Article and Find Full Text PDFThe influence of physical activity levels on lactate production during squat training using a functional electromechanical dynamometer.
PeerJ
January 2025
Department of Physical Education, Sport and Recreation, Universidad de La Frontera, Temuco, Temuco, Chile.
Objective: This study aimed to determine the association between changes in lactate production and levels of physical activity in a group of healthy young adults in response to two squat training protocols.
Material And Methods: Twenty-nine students majoring in Sports Science willingly participated in this study. Participants visited the lab four times within a two-week period, ensuring at least 48 h between visits.
Curvature Memory in Electrically Stimulated Lipid Membranes.
Langmuir
January 2025
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, United States.
We demonstrate, using non-equilibrium molecular dynamics simulations, that lipid membrane capacitance varies with surface charge accumulation linked to membrane shape and curvature changes. Specifically, we show that lipid membranes exhibit a hysteretic response when exposed to oscillatory electric fields. The electromechanical coupling in these membranes leads to hysteretic buckling, in which the membrane can spontaneously buckle in one of two distinct directions along the electric field, even for the same ionic charge accumulation at the water-membrane interface.
View Article and Find Full Text PDFThe design of a striking dummy and the theoretical foundations of martial arts strikes.
Acta Bioeng Biomech
September 2024
Uzbek State University of Physical Education and Sport, Republic of Uzbekistan.
The aim of the research was to develop the design of a striking dummy and the theoretical foundations of martial arts strikes and to test its effectiveness in a pedagogical experiment. This paper presents the design of a striking dummy and the foundational theories behind martial arts strikes. We used modern microelectronics, including a diverse range of sensors, for executing a multitude of electromechanical measurements.
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