Nano

The posture monitoring of basketball is very important for daily training and skill improvement, and the research and development of related sensor technology is extremely urgent. Here, we design a box-shaped triboelectric nanogenerator (BS-TENG) to harvest mechanical energy and serve as the smart sport sensor. The BS-TENG can realize two working modes, leading to harvest both active and passive mechanical energy. This unique box structure enables to be integrated on the floor, which can play the role of smart sport floor. Furthermore, under different basketball posture (such as walk with the ball, dribble and shoot), the BS-TENG can generate different voltage signal, which make BS-TENG can serve as the self-powered sport sensor. We think this design will promote the development of intelligent sports devices.

Efficient microchannel cooling is the key to the development of microelectronics. The key to solving this problem is the geometry of the microchannel heat sink and the thermophysical properties of the fluid. We combined the cantor fractal principle with the microchannel heat sink to design a new type of three-dimensional microchannel structure. Thermal resistance is treated as a single objective function, and the simulated annealing process is utilized to minimize it and achieve satisfying results. When the Reynolds number (Re)$=$100, the aspect ratio of the microchannel entrance ($B/h$), the aspect ratio of the Cantor fractal baffle ($a/b)$ and the ratio of the width of the entrance of the microchannel to the length of the mixing unit ($B/\lambda )$ are optimized. The important factors that affect the thermal resistance of the microchannel are the size and spacing of the baffle. Then the pressure drop and heat transfer under different Res were analyzed. The study found that the structure of the groove and baffle based on the cantor fractal principle will cause chaotic flow and greatly enhance the heat transfer performance. Compared with the reference microchannel, the comprehensive heat transfer coefficient PEC is greater than 1, the thermal resistance is reduced by 19.82%.

In this research work the electrochemical oxidation of ortho-aminophenol (oAP) is studied using modified reduced graphene oxide/indium tin oxide (rGO/ITO) glass electrode in acetonitrile medium, tetrabutyl ammonium perchlorate (TBAP) supporting electrolyte. Cyclic voltammetry (CV) and linear-sweep voltammetry (LSV) techniques were used to study the redox behavior of oAP. The graphene oxide-initiated auto-oxidized 2-aminophenoxazine-3-one is irreversibly reduced by modified rGO/ITO glass electrode at −0.048V (versus Ag–AgCl electrode). LSV response shows that the cathodic peak current increases notably compared to that of bare rGO/ITO glass electrode and with the increasing concentration of oAP. The oxidized product of oAP was characterized by UV–Visible and FT-IR spectroscopy. The redox behavior of oAP of modified rGO/ITO glass electrode was compared with the electrochemical behavior of oAP at bare glassy carbon electrode.

To repair the damage to the epoxy/carbon fiber laminate, a single-lap test was performed between sulfuric acid anodized aluminum plate and carbon fiber laminate to study the effect of the anodized layer on the interlaminar shear strength. Then, carbon fiber laminates were prepared by wet-laying method to simulate the damage caused by penetrating cracks, and double-sided adhesive sheets were made from 0.5mm thick 2024-T3 aluminum alloy and carbon fiber laminates to match the thickness and material of the simulated damage plate. The adhesive matrix used was E51 bisphenol-A epoxy resin with 1.5wt.% nanorubber added for modification and toughening. After double-sided patching, tensile tests were performed to investigate the effect of different materials on the tensile strength of double-sided adhesive patches. We observed SEM images of the fracture surface of the patch after tensile failure and analyzed the strengthening mechanisms of different material patches. The results show that the shear strength between the single-layer sulfuric acid anodized aluminum plate and the carbon fiber laminate is 9.792 MPa, which is 61.5% higher than the shear strength of the nonanodized aluminum plate. The tensile strength of the 2024-T3 aluminum patch specimen is 271.83 MPa, which is 48.43% and 23.97% higher than the perforated specimen without patch and the specimen with carbon fiber laminate patch, respectively, and reaches 72.56% of the undamaged carbon fiber laminate. The specimens with aluminum plate patches showed a maximum bending strength of 616.47 MPa, which increased by 70.83% compared to the 360.875 MPa of the perforated specimens. The maximum bending strength of the aluminum plate patch specimen reached 74.76% of that of the undamaged specimen. However, the maximum bending strength of the composite patch specimen is as high as 1101.9 MPa, far exceeding that of other samples. Due to the poor toughness of the sample, it cannot withstand large strains. The addition of 1.5wt.% nanorubber results in shear yield bands and induces silver grains to absorb a large amount of energy during stress deformation.

Searching for a stable and efficient photocatalyst still presents a variety of challenges, when photocatalytic technology is widely used today. In this paper, oxygen-vacancy BiOCl with different masses was loaded on Bi₄O₅Br₂ nanosheets by a simple two-step method. The UV–Dis spectrum showed that the absorption range of the complex to visible light was larger than that of the two pure substances. In addition, the PL, $i$–$t$ and EIS characterization prove that the formation of heterogeneous interface between the two materials accelerated the charge transfer in the semiconductor, eventually making photocatalytic efficiency significantly increased. The results showed that the 1 wt.% Ov-BOC@BOB has the best degradation performance, which was seven and four times than that of Ov-BOC and BOB within 120 min, respectively. Free radical capture experiment further confirmed that the charge transfer between oxygen-vacancy BiOCl and Bi₄O₅Br₂ conforms to the Z-type transfer mechanism, such a charge-transfer mechanism would leave behind strongly reducing electrons and strongly oxidizing holes, respectively. The degradation rate of ciprofloxacin (CIP) was not significantly reduced after five cycles of experiments, indicating that the compound had good stability. This study provides a feasible idea for exploring stable and efficient photocatalysts.

We present theoretical modeling of the local surface plasmon resonance (LSPR) induced by hollow nanoshell spheres assisted with a graphene shell, aiming to examine their potential for use as efficient narrowband absorbers in the infrared wavelength region. We investigate two designs of hollow nanoparticles; namely, a hollow graphene nanosphere with a single graphene shell, and a hollow nanosphere with double shells comprising a graphene shell wrapped around a silver shell. The electric field in each region of the nanoshell is determined by solving the Laplace equation of the potential within the electrostatic approximation (the nanoshell radius $<$50nm). Using the calculated polarizability of nanoshells, we derive analytical expressions for the absorption and scattering cross-sections. We show that in both proposed nanocomposite models, the graphene shell affords an ultra-narrow LSPR with an absorption efficiency significantly higher than the scattering efficiency. In addition, the graphene-assisted LSPR can be tuned through the visible and infrared regions by changing the Fermi energy and thickness of the graphene layer. Another exciting finding is that the use of a silver shell in the hollow bi-shell nanoparticles provides another LSPR peak besides that induced by the graphene shell. Both LSPRs of graphene and silver shells can be overlapped by changing the optical properties of graphene and/or the geometrical parameters of the silver shell. The resulting LSPR is characterized by a dominant absorption cross-section and a significant narrowband. In both proposed nanoshell designs, the properties of LSPRs are promising for use in various optical imaging and phototherapy applications.

This study demonstrates the development of an innovative $n$-bit less power ripple carry incrementer (RCI) and decrementer (RCD) circuit, respectively, devised using quantum dot cellular automata (QCA). In order to increment or decrement two numbers, RCI and RCD are essential. With a revised configuration of the AND gate, half adder, and XOR gate circuit, the suggested ripple carry incrementer and decrementer circuits are realized. Modern designs for the XOR and half adder are contrasted with these freshly created ones. Circuits are designed using QCA designer 2.0.3. The 4-bit RCI, 8-bit RCI, and 16-bit RCI as well as 4-bit RCD, 8-bit RCD, and 16-bit RCD simulation results are compared to the theoretical findings.

A two-step low-temperature hydrothermal method was used to construct an aluminum-nickel compound network structure on the substrate surface, followed by a secondary hydrothermal synthesis of ZnO nanorod array. After low surface energy material modification, a superhydrophobic and superoleophobic surface was obtained. The aluminum-nickel compound network structure plays a key guiding role in the growth of ZnO nanorod arrays. The uniformly shaped and densely arranged ZnO nanorod arrays have high roughness and exhibit excellent hydrophobic properties after modification. The surface of the ZnO nanorod array is improved in terms of UV resistance due to the size effect. The effects of hydrothermal reaction temperature, hydrothermal reaction time, hydrothermal reaction pH value, and Zn${}^{2+}$ concentration on the surface structure, morphology, and properties of the ZnO nanorod array were also studied.

An efficient approach to synthetize the sandwich-like graphene-supported manganese oxides nanosheets (G-MnO${}_2)$ had been developed for catalytic combustion of toluene by employing sandwich-like graphene-silica nanosheets (G-silica) as intermediates. The as-prepared G-MnO₂ not only inherited the two-dimensional structure of reduced graphene, high specific surface areas, the unique mesoporous structure, good dispersion, but also possessed numerous nanoparticles of crystalline MnO₂ with the size of about 5nm on each nanosheet. Such unique features had enhanced significantly the catalytic performance and catalytic stability of MnO₂ for toluene oxidation. As a consequence, with the help of sandwich-like G-silica intermediates, the T${}_{50}$ and T${}_{90}$ of G-MnO₂ for toluene was 240${}^{\circ }$C (3.92$\mu$mol $\cdot$g${}^{-1}$h${}^{-1})$ and 262${}^{\circ }$C (7.06$\mu \mathrm{\text{mol}}\cdot {\mathrm{\text{g}}}^{-1}$h${}^{-1}),$ respectively, and even after 30h at 288${}^{\circ }$C, the conversion of toluene could still be maintained at 99.7% (GHSV$=$60000mL$\cdot$g${}^{-1}$h${}^{-1})$.

Novel Cu-based binary composite phases were synthesized with an octadecylamine (ODA) synthetic system. HR-TEM was used to characterize the binary composite phase indicating that the Cu-based binary composite phase was a mixed phase of two oxides. ZnO gas sensing films decorated with Cu-based binary composite phase were parallel fabricated. The gas sensing performance to nitric oxides (NO, N₂O, NO${}_2)$ was studied. Cu–Mo–O binary composite phase-modified ZnO was screened out with high sensitivity and selectivity to NO. The gas sensing response to 0.5 ppm NO was 128.1. The detection limit of Cu–Mo–O binary composite phase-modified ZnO to NO was less than 10 ppb. Cu–Mo–O binary composite phase-modified ZnO also shows good selectivity to NO even using NO₂ as interference gas. It is of great importance for the detection of NO.