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Ionic liquids (ILs) have received attention for a diverse range of applications, but their liquid nature can make them difficult to handle and process and their high viscosities can lead to suboptimal performance. As such, encapsulated ILs are attractive for their ease of handling and high surface area and have potential for improved performance in energy storage, gas uptake, extractions, and so forth. Herein, we report a facile method to encapsulate a variety of ILs using Pickering emulsions as templates, graphene oxide (GO)-based nanosheets as particle surfactants, and interfacial polymerization for stabilization. The capsules contain up to 80% IL in the core, and the capsule shells are composed of polyurea and GO. We illustrate that capsules can be prepared from IL-in-water or IL-in-oil emulsions and explore the impact of monomer and IL identity, thereby accessing different compositions. The spherical, discrete capsules are characterized by optical microscopy, scanning electron microscopy, infrared spectroscopy, Raman spectroscopy, thermogravimetric analysis, and 1H NMR spectroscopy. We illustrate the application of these IL capsules as a column material to remove phenol from oil, demonstrating ≥98% phenol removal after passage of >170 column volumes. This simple method to prepare capsules of IL will find widespread use across diverse applications.

In article number 2000191, Fang‐Zhou Yao, Hong Wang, and co‐workers present a rational structure design strategy by replicating the morphology of raspberries to overcome the challenges associated with the solid inverse correlation between the polarization and dielectric breakdown strength in dielectrics, leading to significantly improved energy storage performance.

inherent drawbacks of transmissive displays. First, all light from a transmissive display is provided by an active light source that consumes energy continuously when the display works. Besides, the display can be quite dim under direct sunlight. Compared to transmissive display, reflective display is illuminated by ambient light. Therefore, it does not consume energy for backlight and is readable under bright sunlight. Then, we invented a "perfect" display by stacking a full-color reflective display on top of a transmissive display ( Figure S1, Supporting Information). This hybrid display can operate in either transmissive or reflective mode. It has not only low power consumption by staying at low-power reflective mode most of the time, but also superior display quality in both low-light and bright sunlight environments. While there are mature transmissive display technologies, reflective display technologies that satisfy hybrid display requirements are still unavailable. One fundamental issue is that the parallel architecture is currently adopted in full-color reflective display technologies [1] (Figure S2, Supporting Information). Even in the ideal case, the optical efficiency of a parallel architecture is limited to a poor value of 33% owing to the filling ratio of each subpixels. Additionally, none of the proposed color reflective displays could be switched into a transparent state, [2] which is critical in a hybrid display.Fortunately, the breakthroughs of nanophotonics [3] and nanofabrication technologies [4] in past decades have vigorously promoted the development of optical metasurfaces, which provide an opportunity to get a "perfect" hybrid display. With the help of precisely designed metasurfaces, incident light can be effectively manipulated. [5] Compared to metallic metasurfaces, all-dielectric metasurfaces have higher optical efficiency and broader bandwidth. [6] However, the difficulty in finding highindex and low-loss dielectrics in near-IR or visible wavelength range limited the application of all-dielectric metasurfaces to longer wavelengths. To solve this problem, we recently pioneered hybrid all-dielectric metasurfaces for efficient ultrabroadband reflector and spectrum splitting. [7] In parallel, we also tailored nanoimprint lithography (NIL) to fabricate largearea metasurfaces in near-IR or visible ranges. [8] Based on these, we proposed a novel application of all-dielectric metasurface High energy consumption and lack of readability under bright sunlight of conventional transmissive display technology greatly limit the user experience of mobile and wearable devices. To solve this issue, a hybrid display by overlaying a full-color reflective display on top of a transmissive display is invented.The key component of this technology is a full-color reflective display based on tandem switchable all-dielectric metasurfaces. The switchable all-dielectric metasurfaces in large size (average area ≈5 cm 2 ) are invented and fabricated by low-cost and high-throughput nanoimprint lithography. Each ...

Ga2O3 is widely applied in power devices and solar-blind ultraviolet photodetectors due to its ultra-wide bandgap, large breakdown field, and favorable stability. However, it is difficult to prepare the ideal...

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