重庆文理学院

Flexible pressure sensors based on conductive composite films exhibit significant potential for applications in electronic skin, medical monitoring, and motion detection due to their pressure-sensitive electrical conductivity. However, simultaneously achieving high sensitivity and a wide detection range remains a formidable challenge. In this study, we propose a novel approach to fabricate a flexible pressure-sensitive film featuring a bioinspired microdome structure reminiscent of rose petals, utilizing solution blending and spin-coating methods. We hypothesize that this unique microstructural design could enable the sensor to achieve both high sensitivity (e.g., up to 1.475 kPa−1) and a broad detection range without compromising its response to various stimuli, including pressure and humidity. Specifically, the microdome architecture is expected to enhance the film’s deformability and hydrophobicity, thereby improving its environmental stability and sensing performance under varying conditions. The structured carbon black (CB) film, incorporating the rose microdome architecture, demonstrates high sensitivity (1.475 kPa−1), enduring up to 2160 repeated cycles, a detection limit of 0.4 kPa, and detection range 0.4–40 kPa, which is equivalent to the weight of a single sheet of paper (6 mg), thereby allowing for accurate monitoring of subtle human movements. Furthermore, this multifunctional integrated thin-film sensor shows considerable potential for real-time strain and temperature detection. The developed flexible pressure sensor, composed of adsorbed carbon black (CB@PDMS), holds promising application prospects in wearable smart sensors.

This paper studies the following fractional Schrödinger equation {[ (- Δ )^s u+λ u+ |u|^q-2u =|u|^p-2u in ℝ^N, N≥ 2,; ∫ _ℝ^N|u|^2dx=a>0, ]. where s∈ (0, 1) and 2< p, q ≤ 2_s^*:=2N/N-2s is the fractional critical Sobolev exponent. By giving different assumptions on 2

Although Pneumatic Artificial Muscles (PAMs) are recognized for their compliance and high power-to-weight ratio in ankle exoskeletons, their severe nonlinearities and hysteresis pose significant challenges for precise control, which limits the effectiveness of existing strategies. This study presents a lightweight ankle exoskeleton that not only leverages the advantages of PAMs but also introduces a novel control strategy to overcome these limitations. The key contribution is the development of a Radial Basis Function (RBF) network-optimized Sliding Mode Controller (SMC), which is specifically designed to adaptively compensate for PAM nonlinearities and time-varying disturbances. A precise dynamic model that correlates joint angle and PAM pressure is established through kinematic analysis and quasi-static testing, facilitating the controller design. Experimental evaluations on human gait demonstrate that the RBF-SMC achieves superior tracking precision compared to the conventional SMC. Specifically, for one volunteer, the average tracking error reduces from 0.71° to 0.38° (a reduction of approximately 46

Solid additives, as an efficient approach of morphology control in organic solar cells (OSCs), remain not fully understand in terms of the influence of their intermolecular interactions with photoactive molecules on morphological evolution and ultimate device performance. Herein, the intermolecular interactions between solid additives and photoactive molecules were precisely tuned through molecular isomerization engineering. Three isomers of iodine-substituted 1,2,4-trichlorobenzene were adopted as the solid additives. The four strongly electronegative halogen atoms readily produce intense interactions with the photoactive materials, thereby enhancing their J-type stacking and broadening the absorption spectrum. Crucially, the iodine substituent position on the solid additives was altered, which improved their miscibility and intermolecular interactions with photoactive materials, forming a bicontinuous interpenetrating network. Consequently, the binary OSCs achieved an impressive fill factor of approximately 84% with an efficiency of nearly 21% (certified as 20.42%), ranking among the top OSC performances to date. Furthermore, the device demonstrated excellent storage stability, with an extrapolated T80 (maintaining 80% of its initial efficiency) exceeding 10 000 h.

Hydrogen storage remains a pivotal challenge for clean energy technologies, necessitating materials with high capacity, stability, and reversibility. In this study, we employed first-principles calculations to investigate the hydrogen storage performance of Li-decorated C18 two-dimensional (2D) monolayers, providing atomic-and electronic-level insights into the adsorption mechanism. Our calculations reveal that Li atoms bind strongly and uniformly to the C18 framework, avoiding clustering and generating optimal adsorption sites. Electronic structure analysis, including projected density of states (PDOS) and charge density difference mapping, indicates significant orbital hybridization between Li 2s orbitals and H2 sigma orbitals, facilitating a synergistic combination of Kubas-type interaction and van der Waals interactions that stabilizes molecular hydrogen without dissociation. Our calculations show that Li atoms are stably bound to C18, exhibiting an adsorption energy of-2.378 eV. Adsorption energy and orbital-resolved analysis demonstrate that the interaction strength is tuned to allow reversible hydrogen uptake, leading to a gravimetric storage capacity that meets U.S. Department of Energy (DOE) target (5.5 wt%). The gravimetric storage capacity of Li-decorated C18 is as high as 9.92 wt%, exceeding the DOE target. Thermodynamic and kinetic assessments further confirm the feasibility of hydrogen adsorption/desorption under practical conditions. This study highlights the critical role of electronic structure modulation in optimizing hydrogen-metal interactions and establishes Li-decorated C18 as a promising platform for next-generation hydrogen storage materials.