Interface synthesis for controllable construction of 2D Zn(Bim)(OAc) nanosheets via oil/water system and their application in oil

Fabrication of 2D Zn(Bim)(OAc) MOFs-structured nanosheets based on the oil/water interface.

Model Dimension Reduction and Nonlinear Analysis of the Sprag Clutch-flexible Rotor System Considering Local Nonlinearity

In order to study the influence of local nonlinear factors such as bearing clearance and Hertzian contact on the nonlinear behavior of the sprag clutch-rotor system during high-speed steady-state engaging, a nonlinear force model of rolling bearing considering radial clearance and Hertzian contact is established. Regarding the inner and outer rotors as substructures, the fixed interface modal synthesis method is used to reduce the dimension of the substructure model, and the nonlinear dimension reduction model of the sprag clutch-flexible rotor system (SC-FRS) is obtained. To improve computational efficiency, the Newmark method combined with the fixed interface synthesis method is presented to calculate the system response. The response results of the reduced model with a different number of dominant modes and the unreduced model are compared, and the number of reserved dominant modes of the inner and outer rotors is selected based on the calculation efficiency and accuracy. The effect of the radial clearance of different bearings on the nonlinear vibration response and the dynamic load of the inter-shaft bearing is discussed. It is found that the sensitivity of different radial clearances to the system's amplitude-frequency response is different, and the amplitude jump and the frequency hysteresis appear at the resonance peak.

Microscale Interface Synthesis of Ni-B Amorphous Nanoparticles from NiSO4 by Sodium Borohydride Reduction in Microreactor

Amorphous nanoparticles have attracted a large amount of interest due to their superior catalytic activity and unique selectivity. The Ni-B amorphous nanoparticles were synthesized from aqueous reduction of NiSO4 by sodium borohydride in microscale interface at room temperature. The size, morphology, elemental compositions, and the chemical composition on the surface of Ni-B amorphous nanoparticles were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). All the results showed that the synthesized particles are Ni-B amorphous nanoparticles with uniform in size distribution and having good dispersion. The mean particle diameter of Ni-B amorphous nanoparticles was around 9 nm. The present work provides an alternative synthesis route for the Ni-B amorphous nanoparticles.