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The present research was carried out to clarify relationships between peer pressure, social networking site (SNS) addiction, and SNS-use motives in Korean adolescents. Adolescent SNS users (N = 300, 52.70% female) completed self-report measures of peer pressure, SNS addiction, and SNS-use motives. Findings indicated that adolescents reporting more peer pressure had higher levels of SNS addiction. Moreover, the relationship between peer pressure and SNS addiction was mediated by coping and social-conformity use motives. Results are discussed in terms of implications for prevention and intervention, for adolescents facing peer pressure.

Soft and elastic fiber‐based electronic devices exhibiting high electromechanical stability are highly desirable for sustainable and continuous utilization in various applications. However, effectively assembling the cathode and anode in a single body without unwanted interconnections and realizing an intimate contact interface between the electrode and substrate remain challenging. Here, an electrical shortage‐free one‐body fiber system with double‐helix buckle electrodes created by torsion‐ and strain‐mismatch between carbon nanotube (CNT) ribbons and a rubber substrate is reported. The as‐used CNT ribbons serve as the strain‐insensitive electrode, while the rubber mandrel‐core fiber acts as the key matrix in the following three aspects: as an elastic substrate that ensures reversible structural changes during mechanical deformations; as a dielectric layer for capacitive strain sensing; and as an electrothermal expansion element for tensile contraction. Moreover, because of the mismatch‐induced torque‐balance structure, the helically wrapped CNT buckle electrodes can effectively absorb the applied stresses without noticeable delamination and electrical conductance loss. Consequently, the double‐helix buckle fiber system can reliably provide multiple functions, viz. detection of various deformations (e.g., stretching, twisting, and pressing), electrochemical energy storage with excellent strain tolerance, and reversible electrothermal tensile actuation. [ABSTRACT FROM AUTHOR]

Wearable ion‐selective potentiometric sensors have received considerable interest in enabling taste sensing in robots and for monitoring abnormal conditions, such as poor water quality, spoiled food (freshness), and microbial contamination. Despite advances in wearable ion‐selective sensors, the production of a stretchable and miniaturized ion‐selective sensor to detect various ions remains a challenge for practical applications. Herein, a stretchable multi‐ply potentiometric sensor is reported based on ion‐selective coiled yarn (ISCY) with Carbon nanotube. Three types of ISCYs show high sensitivity and selectivity toward a specific target ion, such as K+, Na+, and H+. The sensitivity and selectivity are maintained even at 27% strain and under mechanical deformation, such as being bent by 180° or tied into a knot. Furthermore, an attempt is made to miniaturize the sensor into a single fiber by plying three types of ISCYs and a reference electrode together. This multi‐ion potentiometric sensor is successfully woven into fabrics, such as clothes or gloves, and exhibits a functional sensing performance in various water‐based solutions (sea, river, tap, and distilled waters) and fruit juices as practical applications. These results suggest that this potentiometric sensor has a high potential application as a taste sensor and a monitoring sensor in an electronic tongue. [ABSTRACT FROM AUTHOR]

Energy harvesting, as a sustainable power source for implantable medical devices within the human body, is an intriguing area of research. The utilization of biochemical and biomechanical energy derived from the body offers a promising sustainable energy source. However, obtaining high power density in vivo is a challenge. Herein, energy harvesting is demonstrated using hybrid energy harvesters that simultaneously use mechanical energy from stretching and chemical energy from glucose. The hybrid energy harvesters operate as both biofuel cells (BFC) and mechano‐electrochemical energy harvesters (MEEH) within a single electrochemical cell. As a result, the hybrid energy harvesters offer a maximum power density of 17.8 W kg−1 and an average power density of 15.1 W kg−1. These values increase by 14.5% in maximum power density and 16.8% in average power density, compared to the sum of the power density obtained by mechanical stretching and glucose oxidation individually. Based on their improved performance and compact size, owing to the synergistic effect of the two electrochemical harvesting methods, these hybrid harvesters have the potential to be applied to implantable power sources. [ABSTRACT FROM AUTHOR]

Owing to increasing amount of research on energy harvesting, studies on harvesters for practical application and their performance are attracting attention. Therefore, studies on the use of continuous energy as an energy source for energy‐harvesting devices are being conducted, and fluid flows, e.g., wind, river flow, and sea wave, are widely used as input energy sources for continuous energy harvesting. A new energy‐harvesting technology has emerged based on the mechanical stretch and release of coiled carbon nanotube (CNT) yarns, which generate energy based on the change in the electrochemical double‐layer capacitance. First, this CNT yarn–based mechanical energy harvester is demonstrated, which is applicable to various environments where fluid flow exists. This environment‐adaptable harvester uses rotational energy as the mechanical energy source and is tested in river and ocean environments. Moreover, an attachable‐type harvester for the application of the existing rotational system is devised. In the case of a slow rotational environment, a square‐wave strain‐applying harvester has been implemented, which can convert sinusoidal strain motion into square‐wave strain motion for high output voltages. To achieve high performance of practical harvesting applications, a scale‐up method for powering signal‐transmitting devices has been implemented. [ABSTRACT FROM AUTHOR]