In this Article, superhydrophobic CuO surfaces with different topographies have been fabricated by combining both a simple solution-immersion process and self-assembly of fluoroalkylsilane. We regulate the solution-immersion process by changing the immersion time, the growing temperature, and the solution compositions to control different topographies of CuO surfaces. The as-prepared superhydrophobic surfaces possess tunable water adhesion that ranges from extremely low to very high, on which the sliding angle is 3 ( 1, 12 ( 1, 28 ( 2, 39 ( 2, and 90°(the water droplet is firmly pinned on the superhydrophobic surface without any movement at any tilted angles), respectively. Our work provides a facile and promising strategy to fabricate superhydrophobic surfaces with tunable adhesion.

Anatase (TiO 2 ) nanoparticles with an average diameter of 10 nm were synthesized by solvothermal method followed by surface modification with stearic acid (SA). As-prepared, the nanoparticles (SA-TiO 2 ) were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetry (TGA) and differential scanning calorimetry (DSC). The tribological properties of SA-TiO 2 as an additive of liquid paraffin (LP) were evaluated by a fourball tester. The results show that LP with SA-TiO 2 exhibited good anti-wear and friction-reduction properties under the all applied loads. Comparing LP with LP-containing SA, LP-containing TiO 2 , and LP-containing SA-TiO 2 , the LP-containing SA-TiO 2 had the best load-carrying capacity. It was deduced that the boundary lubricating film was mainly composed of TiO 2 deposits and an adsorbing film of SA which contribute to the excellent lubricating effect of SA-TiO 2 in LP.

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Layered magnetic/piezoelectric heterostructures have drawn a great amount of interest for their potential use in ultra-sensitive magnetoelectric (ME) sensors, ME antennas, voltage tunable inductors, magnetic tunable resonators, etc. It is critically important to characterize the saturation magnetostriction, piezomagnetic coefficient, ΔE effect, and magnetomechanical coupling factor of magnetic thin films, which determine the performance of these ME devices. In this work, a sensitive system has been developed to measure these magnetomechanical properties, on which several different magnetostrictive thin films on the silicon substrate cantilever were characterized. A 0.015 ppm limit of detection of the magnetostriction tester and a frequency resolution of 0.01 Hz of the ΔE tester have been achieved. After magnetic anneal treatment, a record high piezomagnetic coefficient of 12 ppm/Oe, a giant magnetic field induced Young's modulus change of 153 GPa, and a high effective magnetomechanical coupling factor of 0.84 have been measured in FeGaB thin films.

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