Junseong Ahn

Abstract The development of soft electrothermal actuators (ETAs) that can be designed in arbitrary shapes and can easily handle soft objects has recently attracted much attention. However, the existing ETAs cannot be locally designed with a single substrate geometry, which places certain limitations on their applications. In addition, some limited materials (e.g., highly aligned carbon nanotubes) are used as heating layers for improving actuation controllability, which results in a high driving

The growing demand for complex three-dimensional (3D) micro-/nanostructures has inspired the development of the corresponding manufacturing techniques. Among these techniques, 3D fabrication based on mechanically guided assembly offers the advantages of broad material compatibility, high designability, and structural reversibility under strain but is not applicable for nanoscale device printing because of the bottleneck at nanofabrication and design technique. Herein, a configuration-designable

Abstract Fiber supercapacitors (FSs) based on transition metal oxides (TMOs) have garnered considerable attention as energy storage solutions for wearable electronics owing to their exceptional characteristics, including superior comfortability and low weights. These materials are known to exhibit high energy densities, high specific capacitances, and fast redox reactions. However, current fabrication methods for these structures primarily rely on chemical deposition, often resulting in undesira

The growing demand for nanophotonic devices has driven the advancement of nanotransfer printing (nTP) technology. Currently, the scope of nTP is limited to certain materials and substrates owing to the temperature, pressure, and chemical bonding requirements. In this study, we developed a universal nTP technique utilizing covalent bonding-based adhesives to improve the adhesion between the target material and substrate. Additionally, the technique employed plasma-based selective etching to weake

The high demand for micro-/nanohierarchical structures as components of functional substrates, bioinspired devices, energy-related electronics, and chemical/physical transducers has inspired their in-depth studies and active development of the related fabrication techniques. In particular, significant progress has been achieved in hierarchical structures physically engineered on surfaces, which offer the advantages of wide-range material compatibility, design diversity, and mechanical stability,

Nanomaterial-based yarns have been actively developed owing to their advantageous features, namely, high surface-area-to-volume ratios, flexibility, and unusual material characteristics such as anisotropy in electrical/thermal conductivity. The superior properties of the nanomaterials can be directly imparted and scaled-up to macro-sized structures. However, most nanomaterial-based yarns have thus far, been fabricated with only organic materials such as polymers, graphene, and carbon nanotubes.

With the advancement of electronics, there is a growing need to effectively combine rigid, flexible, and stretchable materials to build hybrid electronics. However, the interfacial transition between rigid/flexible and stretchable substrates presents considerable challenges, mainly due to differences in elastic moduli, complicating their integration for practical usage. Here, bioinspired omnidirectional interfacial-engineered flexible islands (BOIEFI) are introduced for a robust transition from

Abstract In the evolving landscape of the Internet of Things (IoT), the deployment of sensors is surging, along with increasing demands for higher performance. However, improving sensor capabilities solely through hardware advancements, such as material and structural design, faces inherent limitations. Common sensing materials, including semiconducting metal oxides, graphene, conductive polymers, elastomers, and noble metals, suffer from issues such as poor selectivity, slow response time, and

In article number 1900997, Jun-Ho Jeong, Inkyu Park and co-workers introduce a novel method of electrothermal actuator (ETA) design, revealing that heterogeneous conductance control of ETA realizes locally shape-morphable actuation. The proposed actuator can be applied to soft robotics for handling various objects in diverse actuation shapes.

Recently, integrated motor propulsors (IMPs) have been under extensive research and development because of the numerous advantages of underwater propulsion for vehicles, such as a simple, quiet, lightweight, and small-size structure [1]. IMPs require minimized torque ripple for smooth and quiet operation when used in undersea vehicles or unmanned submarines. Thus, torque ripple reduction should be considered in the design stage.

In this work, we report a novel stretchable fabric heater based on silver nanowire, carbon nanotube composites. We propose improved spray coating method to develop a stretchable fabric heater with excellent mechanical properties and electrical properties. The combination of the carbon nanotubes (CNTs) with high structural stability and silver nanowires (Ag NWs) with high conductivity could highlight the advantage of each nanomaterials. The proposed fabric heater showed a stable temperature contr

The two major symptoms characterizing Alzheimer's disease are the formation of amyloid-<TEX>${\beta}$</TEX> extracellular deposits in the form of senile plaques and intracellular neurofibrillary tangles (NFTs) that consist of pathological hyperphosphorylated tau protein aggregated into insoluble paired helical filaments (PHFs). Neurons of the central nervous system have appreciable amounts of tau protein, a microtubule-associated protein. To maintain an optimal operation of nerves, the microtubu

Using (S)-decursinol isolated from root of Angelica gigas Nakai (AGN), we semi-synthesized and evaluated a series of both enantiomerically pure decursin derivatives for their antiproliferative activities against A549 human lung cancer cells. All synthesized compounds showed a broad spectrum of inhibitory activities against the growth of A549 cells. Especially, compound (S)-2d with (E)-(furan-3-yl)acryloyl group showed the most potent activity (IC₅₀: 14.03 µM) against A549 cancer cells

If a new drug candidate will be a mixture of enantiomers, both enantiomers should be separately studied for at least latent genotoxicity as early as possible since the thalidomide tragedy. Our group has recently reported that KCP-10043F (OZ-001) as a racemate (±)-3,4-dihydroquinazoline derivative strongly represses the proliferation of human A549 lung cancer cells by caspase-mediated apoptosis via STAT3 inactivation. To investigate the possible teratological effects of the two enantiomers of a r

Hierarchical Structures In article number 2300871, Jun-Ho Jeong, Inkyu Park, and co-workers categorize the basic components of micro/nano hierarchical structures physically engineered on surfaces by their functions/shapes. Their comprehensive review explores the materials and methods used to fabricate various hierarchical structures, along with representative examples and their structural characteristics. Strategies to overcome limitations and achieve superior hierarchical structures are also di