Abstract: There is a viscoelastic strain sensor that includes a sensing layer including a viscoelastic material, the viscoelastic material including a viscoelastic hydrogel and a conductive nanofiller. The viscoelastic material has a fractional resistance change that increases with an increase of an applied tensile strain, and the viscoelastic material has a fractional resistance change that decreases with an applied compressional strain.

Abstract: An electrical power generator includes an M-gel layer that includes MXene and a hydrogel, first and second flexible layers that sandwich the M-gel layer so that the M-gel layer is sealed from an ambient, and a single terminal electrically connected to the M-gel layer. The M-gel layer is configured to transform acoustic energy into electrical energy.

Abstract: There is a viscoelastic strain sensor that includes a sensing layer including a viscoelastic material, the viscoelastic material including a viscoelastic hydrogel and a conductive nanofiller. The viscoelastic material has a fractional resistance change that increases with an increase of an applied tensile strain, and the viscoelastic material has a fractional resistance change that decreases with an applied compressional strain.

Abstract: The present disclosure relates to a technique for manufacturing a humidifying membrane including a hydrophobic thin film-coating layer having a nano-sized crack morphology pattern on the surface of an aromatic hydrocarbon-based polymer ion exchange membrane and applying the membrane to a reverse electrodialysis process. The humidifying membrane including a hydrophobic thin film-coating layer having a nano-sized crack morphology pattern on the surface of an aromatic hydrocarbon-based polymer ion exchange membrane, manufactured according to the present disclosure, embodies a low bulk resistance of the ion exchange membrane and significantly improves ion selectivity, thereby overcoming the trade-off relationship between membrane resistance and ion selectivity, and thus may be commercially available as an anion and cation exchange membrane of a reverse electrodialysis device.

Abstract: There is provided a tactile feedback device comprising: an array of surface charge generation units; and an array of pressure-generation units, wherein the array of the pressure-generation units is spaced apart from the array of the surface charge generation units, wherein the array of the pressure-generation units is movable relative to the array of the surface charge generation units, wherein an attractive or repulsive force is generated between a corresponding surface charge generation unit of the array of surface charge generation units and a corresponding pressure-generation unit of the array of the pressure-generation units, based on a polarity of surface charges induced in the corresponding surface charge generation unit.

Abstract: The present disclosure relates to a technique for manufacturing a self-humidifying membrane including a hydrophobic thin film-coating layer having a nano-sized crack morphology pattern on the surface of an aromatic hydrocarbon-based polymer ion exchange membrane and applying the membrane to a reverse electrodialysis process. The self-humidifying membrane including a hydrophobic thin film-coating layer having a nano-sized crack morphology pattern on the surface of an aromatic hydrocarbon-based polymer ion exchange membrane, manufactured according to the present disclosure, embodies a low bulk resistance of the ion exchange membrane and significantly improves ion selectivity, thereby overcoming the trade-off relationship between membrane resistance and ion selectivity, and thus may be commercially available as an anion and cation exchange membrane of a reverse electrodialysis device.

Abstract: There is provided a tactile feedback device comprising: an array of surface charge generation units; and an array of pressure-generation units, wherein the array of the pressure-generation units is spaced apart from the array of the surface charge generation units, wherein the array of the pressure-generation units is movable relative to the array of the surface charge generation units, wherein an attractive or repulsive force is generated between a corresponding surface charge generation unit of the array of surface charge generation units and a corresponding pressure-generation unit of the array of the pressure-generation units, based on a polarity of surface charges induced in the corresponding surface charge generation unit.

Abstract: There is provided an electrical-energy harvester for a display panel, the harvester comprising: a transparent and flexible lower electrode; a transparent and flexible piezoelectric layer on the lower electrode; reflective particles dispersed in the piezoelectric layer for reflecting light beams incident into the piezoelectric layer; a transparent and flexible upper electrode on the piezoelectric layer, wherein the upper and lower electrodes are opposite to each other; and at least one solar cell disposed on at least one lateral side of the piezoelectric layer, wherein at least one solar cell is configured to receive the light beam reflected from the reflective particles and, thus, to generate electrical energy.

Abstract: There is provided an electrical-energy harvester for a display panel, the harvester comprising: a transparent and flexible lower electrode; a transparent and flexible piezoelectric layer on the lower electrode; reflective particles dispersed in the piezoelectric layer for reflecting light beams incident into the piezoelectric layer; a transparent and flexible upper electrode on the piezoelectric layer, wherein the upper and lower electrodes are opposite to each other; and at least one solar cell disposed on at least one lateral side of the piezoelectric layer, wherein at least one solar cell is configured to receive the light beam reflected from the reflective particles and, thus, to generate electrical energy.

Abstract: A nanogenerator and a method of manufacturing the same are provided. The nanogenerator includes a boron nitride atomic layer, and a first electrode and a second electrode disposed on the boron nitride atomic layer.

Abstract: An insulating sheet has a heterogeneous laminated structure, and includes a graphene sheet and a hexagonal boron nitride sheet on the graphene sheet, the hexagonal boron nitride sheet having a root mean square (RMS) surface roughness of about 0.5 nm or less in a region having an area of about 200 nm×200 nm or less, and one or more of longitudinal and transverse lengths of about 1 mm or more.

Abstract: A microheater and a method of manufacturing the same are disclosed. The microheater includes a substrate, graphene disposed on the substrate and formed in a pattern; and a passivation layer disposed on the graphene. The method of manufacturing a microheater involves transferring graphene to a substrate, forming a first pattern for supplying electric power to the graphene, forming an electrode on the first pattern, forming a second pattern for focusing heating in the graphene, and forming a passivation layer on the graphene having the electrode and the second pattern formed therein.

Abstract: An insulating sheet has a heterogeneous laminated structure, and includes a graphene sheet and a hexagonal boron nitride sheet on the graphene sheet, the hexagonal boron nitride sheet having a root mean square (RMS) surface roughness of about 0.5 nm or less in a region having an area of about 200 nm×200 nm or less, and one or more of longitudinal and transverse lengths of about 1 mm or more.

Abstract: A nanogenerator and a method of manufacturing the same are provided. The nanogenerator includes a boron nitride atomic layer, and a first electrode and a second electrode disposed on the boron nitride atomic layer.