In this paper, the effects of electrolytes on the corrosion resistance and tribocorrosion performance of micro‐arc oxidation (MAO) coatings on AZ31B magnesium (Mg) alloys in simulated body fluid (SBF) were studied. Scanning electron microscopy (SEM) and X‐ray diffraction (XRD) were utilized to explore the microstructure, surface morphology, and phase components of the MAO coatings. Corrosion and tribocorrosion performance of MAO coated Mg alloys were evaluated by using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and a ball‐on‐disk tribotester. It was found that MAO coating produced in electrolyte containing both Na2SiO3 and Na2B4O7 exhibited superior corrosion resistance and tribocorrosion performance in the SBF.

Surface treatments are always needed to enhance corrosion-resistant performance of aluminum (Al) alloys when they are used in seawater environments. The paper aimed to prepare the composite oxide ceramic coating on Al alloy 7075 by combining micro-arc oxidation (MAO) and magnetron sputtering technology. The Al substrate was precoated with titanium (Ti) layer by using the magnetron sputtering technology and then treated by MAO in the alkaline aluminate electrolyte, resulting in a composite MAO coating, which is composed of Al 2 O 3 and TiO 2 along with the complex oxide (Al 2 TiO 5 ). The potentiodynamic polarization and electrochemical impedance spectroscopy were carried out to evaluate the corrosion performance of the MAO coatings in 3.5 wt% NaCl solution. Better corrosion resistance was observed for composite oxide coating than the reference MAO coating on the bare Al, as evidenced by the higher corrosion potential of −0.664 V versus Ag/AgCl and the lower corrosion current density of 4.41 × 10 -6 A/cm 2 .

The development of invisible patterns via programmable patterning can lead to promising applications in optical encryption. This study reports a facile method for building responsive photonic crystal patterns. Commercially printed patterns were used as a mask to induce invisible patterns revealed by wetting. The masked areas exhibit different swelling kinetics, leading to strong structural colors in the masked area and transparent features in the unmasked area. The contrast could disappear through different wetting behavior, providing a unique and reversible wetting feature. This programmable printing is expected to become an environmentally friendly technique for scalable invisible optical anti-counterfeiting technology.

: Nanoparticles have been widely used in cancer therapy because of its nanoscale, high surface ratio, multifuntions and so on. With specific construction of nanoparticles, such as choosing magnetic nanomaterials or citric acid coated nanoparticle, scientists can kill tumor cells effectively and accurately，importantly， reducing the side effect of conventional chemotherapy. Currently, they have been continually applied in cancer therapeutics research. Scientists not only designed nanoparticles loading with therapeutic drugs, but also equipped with targeted molecules. These works make nanoparticles become a multifuntional nanocarrier. In the construction of multifunctional nanocarriers, nanoparticles play the important work of drug delivery. Normally, enabling drugs delivery to tumor tissues is a difficult task. During the period of internal circulation, it is hard to keep the nanocarriers stability. As well as not attach to normal cells or serum. With the application of stimulus-responsive nanomaterials, scientists develop many nanocarriers with controllable drug release. These controllable drug delivery systems can quickly respond to microenvironmental changes (PH, enzyme, etc.) or external stimuli (photo, heat, magnetic or electric fields). Thus, it is to overcome the side effects by controllable drug delivery systems in vivo. In this article, we summarize the various kinds of stimulus-responsive nanocarriers for cancer therapy and discuss its possibilities and challenges in future application.