An Approach for the Dyeing of Horsehair with Herbal Sources

Novel Linear, Piezoresistive, Auxetic Sensors Coated by AAA Battery Active Carbons with Supreme Sensitivity for Human Body Movement Detection

“…However, using the auxetic structure to regulate the performance of strain sensor was reported by several papers in the past few years. [23][24][25]27,28,47,57,58,[61][62][63][64][65][66][67] In this article, the optimization was such that by changing the geometry of the sensor structure, its sensing performance was improved. It means that a connection was established between the mechanical properties and the sensory properties of the sensor, and this type of optimization had not been done in the literature review.…”

“…Piezoresistive strain sensors, [1][2][3][4][5][6][7] which transform mechanical stimulation into readable optical or electrical signals, have a significant effect on the emerging fields of soft robotics, [8][9][10][11][12][13][14][15][16][17][18] healthcare monitoring, [19][20][21][22][23][24][25][26][27][28] electrical skins, [29][30][31][32][33] and wearable devices. [24,[34][35][36][37][38][39][40][41] For example, stretchable piezoresistive sensors on muscles of the neck profit throat cancer, respiratory disturbance, and diagnosis of defective vocal cords, [18] while those on the wrist of humans help with vibration identification in Parkinson's illness and epilepsy.…”

Novel Linear Piezo‐resistive Auxetic Meta‐Sensors with Low Young's Modulus by a Core–Shell Conceptual Design and Electromechanical Modelling

“…[1,2] They exhibit counter-intuitive deformation behaviors under uniaxial loading and become DOI: 10.1002/mame.202300219 transversally thicker (thinner) under tension (compression). [3] Due to their extraordinary specifications, they have extensively been implemented in many fields including the medical industry, [4,5] actuation, [6] sports protection, [7] and sensors. [8] Auxetic materials have widely been used for manufacturing piezo-resistive sensors in recent years and provide extremely well sensing performance.…”

“…Table 1 provides an overview of the research background on piezo-resistive sensors. According to Table 1, the main parameters affecting the sensing performance of the sensor are the substrate material [11][12][13] (e.g., twocomponents room temperature vulcanizing silicone (Silicone RTV2), polydimethylsiloxane (PDMS), Ecoflex, and thermoplastic polyurethane (TPU)), sensory element materials (e.g., graphene, [14][15][16] graphite, [17,18] carbon nanotubes (CNTs), [19][20][21][22][23] nanoparticles and nanowires [24] ), manufacturing method (e.g., 3D printing, [25] mixing, [8,17,26,27] coating [14,28] and layer compositing [3,18] ), and the structure of the sensor (e.g., conventional material, re-entrant auxetic structures, [8,18,29] constant Poisson's ratio (CPR) auxetic structures [17] and planar isotropic auxetic structures [30] ). The fourth case shows the connection between mechanical and electronic properties.…”

“…The idea of constructing a two-phase materials sensor for a re-entrant structure, the core-shell idea, was presented in our previous work. [3] In this paper, the purpose of proposing the core-shell idea is that the sensors made by the coating method, although they have high sensing performance and low elastic modulus, they have low durability due to the separation of graphite particles. On the other hand, the sensors made by the mixing method provide long durability but have lower sensing performance and higher elastic modulus.…”