Tak Dong Jeong

Physical and electrochemical features of nanoporous electrodes arising from their morphology are presented in this perspective. Although nanoporous electrodes have been used to enhance electrocatalysis for several decades, the origin of their capability was understood on the basis of enlarged surface area or crystalline facet. However, considerable attention should be paid to the fact that nano-confined space of nanoporous electrodes can significantly affect electrochemical efficiency. Molecular

A simple method that uses graphene to fabricate nanotopographic substrata was reported for stem cell engineering. Graphene-incorporated chitosan substrata promoted adhesion and differentiation of human mesenchymal stem cells (hMSCs). In addition, we proposed that nanotopographic cues of the substrata could enhance cell-cell and cell-material interactions for promoting functions of hMSCs.

This article provides an overview of recent research achievements in miniaturized flow cytometry. The review focuses on chip-based microfluidic flow cytometers, classified by cell transport method, detection technology, and biomedical application. By harnessing numerous ideas and cutting-edge microfabrication technologies, microfluidic flow cytometry benefits from ever-increasing functionalities and the performance levels achieved make it an attractive biomedical research and clinical tool. In t

Analytical applications and the underlying principles of unique electrochemistry in nanoporous structures are reviewed and discussed. In addition to the conventional concept of enlarged surface area, the structural effects of nanoporous materials can play significant roles such as discriminative electrokinetics, the nano-confinement effect, electrical double layer overlapping, ion-selective impedance, etc. The applications described in this review article include solid-state pH sensors, miniatur

We have devised a unique method for sensitive and selective detection of Hg(2+) ions using DNA-modified gold microshells which can be individually manipulated using a micropipette and act as a micro SERS probe for analysis in small sample volumes.

The highly selective electrochemical reduction of carbon dioxide (CO 2 ) is reported to formate (HCOO ‐ ) at a compactly integrated bioelectrode. The enzymatic biocatalytic cathode is fabricated by single‐step electropolymerization of a multifunctional polydopamine film in which enzyme/cofactor couples are uniquely embedded. Interestingly, this thin biohybrid system of nanoscale thickness assures unprecedentedly prolonged catalytic enzyme stability for about two weeks. Mimicking the natural phot

Color generation based on strategically designed plasmonic nanostructures is a promising approach for display applications with unprecedented high-resolution. However, it is disadvantageous in that the optical response is fixed once the structure is determined. Therefore, obtaining high modulation depth with reversible optical properties while maintaining its fixed nanostructure is a great challenge in nanophotonics. In this work, dynamic color tuning and switching using tungsten trioxide (WO<su

Geometric factors affecting the enhanced electrocatalysis on nanoporous Pt (L 2 -ePt) were examined by electrochemical methods and computer simulations. The experimental results revealed that the electrochemical enhancement of O 2 and H 2 O 2 does not come only from expansion of the active surface area (so-called roughness factor, f R ) of L 2 -ePt. The presence of extra contribution was verified by the fact that significant enhancement in electrocatalytic reactions remained even after the effec

A microfluidic electroporator operating under a continuous low dc voltage (7 to approximately 15 V) is reported. The proposed electroporation microchip exploits the ionic conductivity of polyelectrolytic gel electrodes to precisely control the electric field that is applied to cells without bubble generation in the microchannel. In this study, pDADMAC (poly diallyldimethylammonium chloride) was used to efficiently apply the electric potential difference to the cells in the microchannels. Impedan