MXene-based fibers:Preparation,applications,and prospects

With the vigorous development and huge demand for portable wearable devices,wearable electronics based on functional fibers continue to emerge in a wide range of energy storage,motion monitoring,disease prevention,electromagnetic interference(EMI)shielding,etc.MXene,as an emerging twodimensional inorganic compound,has shown great potential in functional fiber manufacturing and has attracted much research attention due to its own good mechanical properties,high electrical conductivity,excellent electrochemical properties and favorable processability.Herein,this paper reviews recent advances of MXene-based fibers.Speaking to MXene dispersions,the properties of MXene dispersions including dispersion stability,rheological properties and liquid crystalline properties are highlighted.The preparation techniques used to produce MXene-based fibers and application progress regarding MXene-based fibers into supercapacitors,sensors,EMI shielding and Joule heaters are summarized.Challenges and prospects surrounding the development of MXene-based fibers are proposed in future.This review aims to provide processing guidelines for MXene-based fiber manufacturing,thereby achieving more possibilities of MXene-based fibers in advanced applications with a view to injecting more vitality into the field of smart wearables.

Overview of Rubik's Cube and Reflections on Its Application in Mechanism

Rubik’s Cube is a widely popular mechanical puzzle that has attracted attention around the world because of its unique characteristics. As a classic brain-training toy well known to the public, Rubik’s Cube was used for scientific research and technology development by many scholars. This paper provides a basic understanding of the Rubik’s Cube and shows its mechanical art from the aspects of origin and development, characteristics, research status and especially its mechanical engineering design, as well as making a vision for the application in mechanism. First, the invention and origin of Rubik’s Cube are presented, and then the special characteristics of the cube itself are analyzed.After that, the present researches of Rubik’s Cube are reviewed in various disciplines at home and abroad, including the researches of Rubik’s Cube scientific metaphors, reduction algorithms, characteristic applications, and mechanism issues. Finally, the applications and prospects of Rubik’s Cube in the field of mechanism are discussed.

Research Progress in the Extraction and Application of Flavonoids from Ginkgo biloba Leaves

Ginkgo biloba resources in China are enormous. With the demand of the market, the preparation and application of flavonoids have become a current research hotspot. The main active substances in G. biloba leaves, flavonoids, have various functional activities and are widely used in fields such as food, medicine, cosmetics, feed, etc. In this paper, the introduction, functional activity, extraction methods, and application research of flavonoids from G. biloba leaves are reviewed, and the development prospects of flavonoids from G. biloba leaves are expected.

Optical Negasensors and Prospects of Their Applications

The basic types of optical negasensors - sensors based on the application of negative resistance, negative inductance and negative capacitance, R, L, C-negatrons are presented. It is shown, that application of negative inductance and capacitance is not connected with stability decreasing as at application of negative resistance and allows to rise sensitivity of a optical sensor theoretically ad infinitum. The example design of multielement optical negasensor for airborne, underwater or biomedical imagin...