One of the current challenges in nanozyme-based nanotechnology is the utilization of multifunctionalities in one material. In this regard, Au@Pt nanoparticles (NPs) with excellent enzyme-mimicking activities due to the Pt shell and unique surface plasmon resonance features from the Au core have attracted enormous research interest. However, the unique surface plasmon resonance features from the Au core have not been widely utilized. The practical problem of the optical-damping nature of Pt hinders the research into the combination of Au@Pt NPs' enzyme-mimicking properties with their surface-enhanced Raman scattering (SERS) activities. Herein, we rationally tuned the Pt amount to achieve Au@Pt NPs with simultaneous plasmonic and enzyme-mimicking activities. The results showed that Au@Pt NPs with 2.5% Pt produced the highest Raman signal in 2 min, which benefited from the remarkably accelerated catalytic oxidation of 3,3',5,5'-tetramethylbenzidine with the decorated Pt and strong electric field retained from the Au core for SERS. This study not only demonstrates the great promise of combining bimetallic nanomaterials' multiple functionalities but also provides rational guidelines to design high-performance nanozymes for potential biomedical applications.

The double T‐junction microchannel is a classical microstructured chemical device used to generate gas/liquid/liquid three‐phase microflows. An experimental study that focused on the three‐phase flow phenomena and bubble/droplet generation rules in a double T‐junction microchannel was introduced. Based on the published knowledge of gas/liquid and liquid/liquid two‐phase microflows, new flow patterns were carefully defined: bubble cutting flow, spontaneous break‐up and bubble cutting coupling flow, and bubble/droplet alternate break‐up flow. According to the classical correlations of bubble and droplet volumes and their generation frequency ratio, the operating criteria for creating different three‐phase flow patterns were established and a model for the dimensionless average bubble and droplet volumes in the three‐phase microflows was developed. These various three‐phase microflows have great application potential in material science and flow chemistry synthesis. © 2015 American Institute of Chemical Engineers AIChE J, 61: 1722–1734, 2015

A black phosphorus (BP)‐nanosheet‐based drug‐delivery system containing a therapeutic drug (Fluoxetine, Flu) is synthesized. According to subsequent behavioral, biochemical, and electrophysiological analysis, BP‐Flu, after irradiated with near‐infrared light (808 nm), can significantly reduce the therapy time of depression. Meanwhile, the inherent biotoxicity of Flu is also alleviated.

Graphene oxide (GO), a derivative of graphene, has attracted widespread attention due to its easy functionalization and excellent water solubility. Therefore, a method for efficiently producing GO shoule be developed. Although the traditional chemical oxidation method is broadly employed for GO synthesis, it entails problems, such as long time-consuming, explosive danger and easy to pollute the environmental. Recent research on using electrochemical methods for GO synthesis has achieved a breakthrough, that is, the realization of pollution-free, safe and efficient large-scale preparation of high-quality GO within a few hours. This article introduces the principle of electrochemical GO synthesis and summarizes the progress of research on GO preparation via two-electrode, three-electrode and electrolyte exfoliation with focalize on product quality and quantity. The challenges in high-quality electrochemical GO production and future research directions are also presented.

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The generation of gas‐liquid‐liquid three‐phase microflows in a cross‐junction microchannel device is experimentally analyzed. Three gas‐phase and eight water‐phase flow manners at the cross junction are described with oil phase as continuous phase. Comparing with the gas‐liquid and liquid‐liquid two‐phase microflows, similar flow behaviors of dispersed phases exist in the three‐phase processes but new capillary numbers as well as the phase ratio of dispersed phases need to be introduced in the flow maps to distinguish the complicated three‐phase flow modes. Although the three‐phase flows are mercurial at the channel junction, only six flow patterns are observed in the downstream microchannel. According to the experimental results, the effects of bubble/droplet generation manners on their size distributions are indicated. The generation mechanisms of bubbles and droplets are analyzed and correlated equations are established for their average volumes.

A gas–liquid–liquid double emulsion with ultra-thin liquid film is proposed for the mass transfer enhancement of an extreme phase ratio system.

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