Electrically Conductive Diamond Membrane for Electrochemical Separation Processes

Electrically switchable Casimir forces using transparent conductive oxides

Casimir forces between charge-neutral bodies originate from quantum vacuum fluctuations of electromagnetic fields, which exhibit a critical dependence on material's electromagnetic properties. Over the years, in-situ modulation of material's optical properties has been enabled through various means and has been widely exploited in a plethora of applications such as electro-optical modulation, transient color generation, bio- or chemical sensing, etc. Yet Casimir force modulation has been hindered by difficulty in achieving high modulation signals due to the broadband nature of the Casimir inte…

外螺旋磁场作用下导电纳米流体薄层中的磁旋转不稳定性与对流不稳定性

Magnetorotational and convective instabilities in a thin layer of electrically conductive nanofluid under an external helical magnetic field

该综述总结了考虑布朗扩散与热泳的非均匀旋转导电纳米流体层磁化流动稳定性研究进展，分析了不同磁场下的磁旋转不稳定性特性与定常对流临界条件，明确了纳米颗粒效应对磁对流行为的调控作用。

Stumbling Through the Research Wilderness, Standard Methods to Shine Light on Electrically Conductive Nanocomposites for Future Health-Care Monitoring

Electrically conductive nanocomposites are an exciting ever expanding area of research that has yielded many new technologies for wearable health devices. Acting as strain sensing materials, they have paved the way towards real time medical diagnostic tools that may very well lead to a golden age of healthcare. Currently, the goal in research is to create a material that simultaneously has both a large gauge factor G and sensing range. However, a weakness in the area of electromechanical research is the lack of standardisation in the reporting of the figure of merit, i.e. G, and the need for n…

Electrically conductive GNP/epoxy composites for out-of-autoclave thermoset curing through Joule heating

The development of scalable Out of Autoclave (OoA) in situ thermoset curing methods are required to overcome important drawbacks related to the autoclave based processing methods typically used in industry. The incorporation of graphene, an electrothermal carbon nanomaterial with the ability to transform electric energy into heat through Joule heating, emerges as a promising route to replace the conventional processing methods. In this work the electrical behaviour of both uncured and oven cured GNPs/epoxy composites with loadings of up to 10 wt% were evaluated and electrical percolation thres…

Visualization of Ion Channels in Membranes using Electrochemical Strain Microscopy

Polymer composite electrolytes of Nafion and phosphotungstic acid (PWA) are fabricated and analyzed using electrochemical strain microscopy (ESM) and conductive atomic force microscopy (C-AFM) to visualize hydrophilic ion channels near the surface, which are composed of water and sulfonic acid groups. The results indicate that the fibrillar objects in ESM image, without significant changes in topography, are hydrophilic ion channels and additional ion channels formed by interaction between PWA and sulfonic groups in Nafion. In this study, the buried ion channels lying under the surface are pro…

Raman Fingerprints of Graphene Produced by Anodic Electrochemical Exfoliation

Electrochemical exfoliation is one of the most promising methods for scalable production of graphene. However, limited understanding of its Raman spectrum as well as lack of measurement standards for graphene strongly limit its industrial applications. In this work we show a systematic study of the Raman spectrum of electrochemically exfoliated graphene, produced using different electrolytes and different types of solvents in varying amounts. We demonstrate that no information on the thickness can be extracted from the shape of the 2D peak as this type of graphene is defective. Furthermore, th…

基于全内反射几何中可调导电界面电调制的超宽带固态太赫兹移相器

Ultrawideband solid-state terahertz phase shifter electrically modulated by tunable conductive interface in total internal reflection geometry

针对现有太赫兹移相器带宽窄的问题，提出基于全内反射几何中可调导电界面的超宽带固态太赫兹移相机制，通过5 V栅压调控石墨烯实现0.4-1.2 THz频带内约120°连续相移，带宽达中心频率100%，插入损耗低且调制速度达kHz量级。

Graphene-Polyurethane Coatings for Deformable Conductors and Electromagnetic Interference Shielding

Electrically conductive, polymeric materials that maintain their conductivity even when under significant mechanical deformation are needed for actuator electrodes, conformable electromagnetic shielding, stretchable tactile sensors and flexible energy storage. The challenge for these materials is that the percolated, electrically conductive networks tend to separate even at low strains, leading to significant piezoresistance. Herein, deformable conductors were fabricated by spray-coating a nitrile substrate with a graphene-elastomer solution. The coatings showed only slight increase in electri…

一种基于电容棘轮的纳米多孔电化学棘轮用于连续离子分离

A nanoporous capacitive electrochemical ratchet for continuous ion separations

本文提出一种基于电容棘轮机制的离子泵，实现无需氧化还原反应的连续离子分离和脱盐。

Single crystal diamond membranes for nanoelectronics

Single crystal, nanoscale diamond membranes are highly sought after for a variety of applications including nanophotonics, nanoelectronics and quantum information science. However, so far, the availability of conductive diamond membranes remained an unreachable goal. In this work we present a complete nanofabrication methodology for engineering high aspect ratio, electrically active single crystal diamond membranes. The membranes have large lateral directions, exceeding 500x500 um2 and are only several hundreds of nanometers thick. We further realize vertical single crystal p-n junctions, made…

无序中的有序：扫描探针显微镜研究氧空位驱动的LaNiO3-x外延薄膜表面电子相分离

Order in disorder: oxygen vacancy driven electronic phase separation of LaNiO3-x epitaxial thin film surface investigated by scanning probe microscopy

本研究利用扫描探针显微镜探究LaNiO3-x外延薄膜表面，发现氧空位驱动的纳米尺度电子相分离，为镍酸盐表面化学转变起源及电催化应用提供了实空间证据。