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Article ; Online: Direct Assembly of Graphene Oxide on Flexible Substrates for Highly Transparent Electrodes via the Langmuir-Blodgett Technique.

Han, Tae Hee

Journal of nanoscience and nanotechnology

2015 Volume 15, Issue 2, Page(s) 1191–1194

Abstract: The surface activity of graphene oxide (GO) offers an ideal building block upon which to construct two-dimensional (2D) nanostructures via side-by-side assembly strategies. In this work, we demonstrate the Langmuir-Blodgett assembly of GO into a 2D film ... ...

Abstract	The surface activity of graphene oxide (GO) offers an ideal building block upon which to construct two-dimensional (2D) nanostructures via side-by-side assembly strategies. In this work, we demonstrate the Langmuir-Blodgett assembly of GO into a 2D film with a carbon monolayer thickness on a PET substrate over a large area. After the reduction of the GO films at a low temperature, transparent flexible conducting films were realized. Our straightforward route for preparing graphene-based transparent films provides a controlled strategy to coat graphene monolayers on flexible substrates.
Language	English
Publishing date	2015-08-18
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1533-4899
ISSN (online)	1533-4899
DOI	10.1166/jnn.2015.9318
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Article: Spherulitic assembly of peptide nanowires via spontaneous crystallization.

Han, Tae Hee

Journal of nanoscience and nanotechnology

2015 Volume 14, Issue 11, Page(s) 8800–8803

Abstract: In this work, the hierarchal arrangement of peptide nanowires was achieved via the spontaneous crystallization of peptide molecules. Peptide molecules, which are structural motifs associated with Alzheimer's disease, assembled into one-dimensional ... ...

Abstract	In this work, the hierarchal arrangement of peptide nanowires was achieved via the spontaneous crystallization of peptide molecules. Peptide molecules, which are structural motifs associated with Alzheimer's disease, assembled into one-dimensional nanowires and spontaneously formed two-dimensional peptide spherulites during crystallization of the peptide melt. The assembly behavior of the peptides could be directed by physically confining the soft mold. Furthermore, a hybrid assembly of small functional molecules, such as photoluminescent Alq3, was also achieved. Our approach offers a simple method for achieving spontaneous long-range crystalline order of building blocks approaching macroscopic dimensions and also a facile hybridization strategy to conjugate biomolecules and functional small molecules.
MeSH term(s)	Crystallization/methods ; Nanotechnology/methods ; Nanowires/chemistry ; Peptides/chemistry ; Phenylalanine/analogs & derivatives ; Phenylalanine/chemistry
Chemical Substances	Peptides ; phenylalanylphenylalanine (2577-40-4) ; Phenylalanine (47E5O17Y3R)
Language	English
Publishing date	2015-04-20
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	1533-4880
ISSN	1533-4880
DOI	10.1166/jnn.2014.9978
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Article ; Online: Surface nitrided MXene sheets with outstanding electroconductivity and oxidation stability.

Eom, Wonsik / Shin, Hwansoo / Jeong, Woojae / Ambade, Rohan B / Lee, Hyeonhoo / Han, Tae Hee

Materials horizons

2023 Volume 10, Issue 11, Page(s) 4892–4902

Abstract: Two-dimensional ... ...

Abstract	Two-dimensional Ti
Language	English
Publishing date	2023-10-30
Publishing country	England
Document type	Journal Article
ZDB-ID	2744250-0
ISSN	2051-6355 ; 2051-6347
ISSN (online)	2051-6355
ISSN	2051-6347
DOI	10.1039/d3mh01180a
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Article ; Online: Grafting Behavior of Amine Ligands for Surface Modification of MXene.

Shin, Hwansoo / Lee, Hyeonhoo / Seo, Yeongbhin / Jeong, Woojae / Han, Tae Hee

Langmuir : the ACS journal of surfaces and colloids

2023 Volume 39, Issue 6, Page(s) 2358–2367

Abstract: Surface modification to improve the oxidation stability and dispersibility of MXene in diverse organic media is a facile strategy for broadening its application. Among the various ligands that can be grafted on the MXene surface, oleylamine (OAm), with ... ...

Abstract	Surface modification to improve the oxidation stability and dispersibility of MXene in diverse organic media is a facile strategy for broadening its application. Among the various ligands that can be grafted on the MXene surface, oleylamine (OAm), with amine functionalities, is an advantageous candidate owing to its strong interactions and commercial viability. OAms are grafted onto MXene through covalent bonds induced by nucleophilic reactions and H bonds in liquid interface reactions at room temperature. In addition, this grafting behavior of the ligand was characterized by a reduction in the slope with an increase in the ligand concentration (
Language	English
Publishing date	2023-02-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	2005937-1
ISSN	1520-5827 ; 0743-7463
ISSN (online)	1520-5827
ISSN	0743-7463
DOI	10.1021/acs.langmuir.2c03094
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Article ; Online: Sustainable 3D printing by reversible salting-out effects with aqueous salt solutions.

Ji, Donghwan / Liu, Joseph / Zhao, Jiayu / Li, Minghao / Rho, Yumi / Shin, Hwansoo / Han, Tae Hee / Bae, Jinhye

Nature communications

2024 Volume 15, Issue 1, Page(s) 3925

Abstract: Achieving a simple yet sustainable printing technique with minimal instruments and energy remains challenging. Here, a facile and sustainable 3D printing technique is developed by utilizing a reversible salting-out effect. The salting-out effect induced ... ...

Abstract	Achieving a simple yet sustainable printing technique with minimal instruments and energy remains challenging. Here, a facile and sustainable 3D printing technique is developed by utilizing a reversible salting-out effect. The salting-out effect induced by aqueous salt solutions lowers the phase transition temperature of poly(N-isopropylacrylamide) (PNIPAM) solutions to below 10 °C. It enables the spontaneous and instant formation of physical crosslinks within PNIPAM chains at room temperature, thus allowing the PNIPAM solution to solidify upon contact with a salt solution. The PNIPAM solutions are extrudable through needles and can immediately solidify by salt ions, preserving printed structures, without rheological modifiers, chemical crosslinkers, and additional post-processing steps/equipment. The reversible physical crosslinking and de-crosslinking of the polymer through the salting-out effect demonstrate the recyclability of the polymeric ink. This printing approach extends to various PNIPAM-based composite solutions incorporating functional materials or other polymers, which offers great potential for developing water-soluble disposable electronic circuits, carriers for delivering small materials, and smart actuators.
Language	English
Publishing date	2024-05-09
Publishing country	England
Document type	Journal Article
ZDB-ID	2553671-0
ISSN	2041-1723 ; 2041-1723
ISSN (online)	2041-1723
ISSN	2041-1723
DOI	10.1038/s41467-024-48121-7
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Article ; Online: scRNA-seq data from the larval Drosophila ventral cord provides a resource for studying motor systems function and development.

Nguyen, Tho Huu / Vicidomini, Rosario / Choudhury, Saumitra Dey / Han, Tae Hee / Maric, Dragan / Brody, Thomas / Serpe, Mihaela

Developmental cell

2024 Volume 59, Issue 9, Page(s) 1210–1230.e9

Abstract: The Drosophila larval ventral nerve cord (VNC) shares many similarities with the spinal cord of vertebrates and has emerged as a major model for understanding the development and function of motor systems. Here, we use high-quality scRNA-seq, validated ... ...

Abstract	The Drosophila larval ventral nerve cord (VNC) shares many similarities with the spinal cord of vertebrates and has emerged as a major model for understanding the development and function of motor systems. Here, we use high-quality scRNA-seq, validated by anatomical identification, to create a comprehensive census of larval VNC cell types. We show that the neural lineages that comprise the adult VNC are already defined, but quiescent, at the larval stage. Using fluorescence-activated cell sorting (FACS)-enriched populations, we separate all motor neuron bundles and link individual neuron clusters to morphologically characterized known subtypes. We discovered a glutamate receptor subunit required for basal neurotransmission and homeostasis at the larval neuromuscular junction. We describe larval glia and endorse the general view that glia perform consistent activities throughout development. This census represents an extensive resource and a powerful platform for future discoveries of cellular and molecular mechanisms in repair, regeneration, plasticity, homeostasis, and behavioral coordination.
MeSH term(s)	Animals ; Larva/genetics ; Larva/metabolism ; Motor Neurons/metabolism ; Motor Neurons/cytology ; Drosophila melanogaster/genetics ; Drosophila melanogaster/metabolism ; Neuroglia/metabolism ; Neuroglia/cytology ; Neuromuscular Junction/metabolism ; Drosophila Proteins/metabolism ; Drosophila Proteins/genetics ; RNA-Seq/methods ; Single-Cell Gene Expression Analysis
Chemical Substances	Drosophila Proteins
Language	English
Publishing date	2024-04-02
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
ZDB-ID	2054967-2
ISSN	1878-1551 ; 1534-5807
ISSN (online)	1878-1551
ISSN	1534-5807
DOI	10.1016/j.devcel.2024.03.016
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Zs.A 5742: Show issues			Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular Jg. 1995 - 2021: Lesesall (2.OG) ab Jg. 2022: Lesesaal (EG)
Zs.MG 76: Show issues

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Article: Sub-Second Joule-Heated RuO₂-Decorated Nitrogen- and Sulfur-Doped Graphene Fibers for Flexible Fiber-type Supercapacitors

Noh, Sung Hyun / Lee, Hak Bong / Lee, Kyong Sub / Lee, Hyeonhoo / Han, Tae Hee

ACS applied materials & interfaces. 2022 June 25, v. 14, no. 26

2022

Abstract: Graphene-based fiber-shaped supercapacitors (FSSCs) have received considerable attention as potential wearable energy storage devices owing to their simple operating mechanism, flexibility, and long-term stability. To date, energy storage capacities of ... ...

Abstract	Graphene-based fiber-shaped supercapacitors (FSSCs) have received considerable attention as potential wearable energy storage devices owing to their simple operating mechanism, flexibility, and long-term stability. To date, energy storage capacities of supercapacitors have been significantly improved via strategies such as heteroatom doping and the incorporation of pseudocapacitive metal oxides. Herein, we develop a novel and scalable direct-hybridization method that combines heteroatom doping and metal oxide hybridization for the fabrication of high-performance FSSCs. Using porous and highly conductive nitrogen and sulfur co-doped graphene fibers (NS-GFs) as self-heating units, we successfully convert ruthenium hydroxide anchored to the surface into ruthenium oxide nanoparticles after programmed sub-second electrothermal annealing without structural damage of the fibers. The resulting fibers show an increased gravimetric capacitance of 68.88 F g–¹ compared to that of the pristine NS-GF (8.32 F g–¹), excellent cyclic stability maintaining 96.67% of the initial capacitance after 20 000 continuous charging/discharging cycles, and good mechanical flexibility. The findings of this work advocate a successful Joule heating strategy for preparing high-performance graphene-based metal oxide hybrid FSSCs for use in energy storage applications.
Keywords	capacitance ; electrochemical capacitors ; energy ; graphene ; hybridization ; nitrogen ; oxides ; ruthenium
Language	English
Dates of publication	2022-0625
Size	p. 29867-29877.
Publishing place	American Chemical Society
Document type	Article
ISSN	1944-8252
DOI	10.1021/acsami.2c06691
Database	NAL-Catalogue (AGRICOLA)

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Article: Joule heating-induced faradaic electrode-decorated graphene fibers for flexible fiber-shaped hybrid supercapacitor with high volumetric energy density

Lee, Hak Bong / Veerasubramani, Ganesh Kumar / Lee, Kyong Sub / Lee, Hyeonhoo / Han, Tae Hee

Carbon. 2022 July 18,

2022

Abstract: The rational design of flexible, portable, and wearable fiber-based electrodes via selective hybridization of materials has motivated researchers to focus on the advancement of miniaturized energy-storage systems with excellent efficacy. Here, we ... ...

Abstract	The rational design of flexible, portable, and wearable fiber-based electrodes via selective hybridization of materials has motivated researchers to focus on the advancement of miniaturized energy-storage systems with excellent efficacy. Here, we introduce a novel Joule-heating approach for manufacturing hybridized fibers consisting of bark-like NiO as a faradaic shell decorated over electrically treated graphene fibers (EGFs@NiO) as a capacitive core for high-performance hybrid supercapacitors. Each Joule-heating process was conducted for a very short period (∼100 s) to achieve highly restored graphitic structures with a reduced internal resistance of GFs to expedite the electrochemical kinetics and successful hybridization of EGFs with NiO for promoting redox reactions. Moreover, an all-solid-state hybrid supercapacitor was constructed using EGFs@NiO as a positive electrode and chemically reduced GF (CGF) as a negative electrode; the supercapacitor exhibited a volumetric capacitance of 838.3 F cm⁻³ (volumetric capacity: 139.7 mAh cm⁻³), wide operating window of 1.5 V, and volumetric energy density of 34.49 mWh cm⁻³ at a power density of 374.97 mW cm⁻³. The energy efficiency of the process was evaluated based on the ratio of the volumetric capacitance of the device to the process time, and the proposed supercapacitor outperformed the recently reported asymmetric/hybrid supercapacitors based on the conventional manufacturing process. Thus, this work contributes to the development of fast, scalable, and cost-effective techniques for fabricating wearable electrodes for real-time applications.
Keywords	capacitance ; cost effectiveness ; electrochemical capacitors ; electrochemistry ; electrodes ; energy density ; energy efficiency ; graphene ; hybridization ; nickel oxide ; processing time
Language	English
Dates of publication	2022-0718
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ISSN	0008-6223
DOI	10.1016/j.carbon.2022.07.047
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Rheological Investigation of Relaxation Behavior of Polycarbonate/Acrylonitrile-Butadiene-Styrene Blends.

Seo, Jae Sik / Jeon, Ho Tak / Han, Tae Hee

Polymers

2020 Volume 12, Issue 9

Abstract: The rheological properties of polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends with various blend ratios are investigated at different temperatures to determine the shear dependent chain motions in a heterogeneous blend system. At low ... ...

Abstract	The rheological properties of polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) blends with various blend ratios are investigated at different temperatures to determine the shear dependent chain motions in a heterogeneous blend system. At low frequency levels under 0.1 rad/s, the viscosity of the material with a blend ratio of 3:7 (PC:ABS) is higher than that of pure ABS polymer. As the temperature increases, the viscosities of ABS-rich blends increase rather than decrease, whereas PC-rich blends exhibit decrease in viscosity. Results from the time sweep measurements indicate that ordered structures of PC and the formation and breakdown of internal network structures of ABS polymer occur simultaneously in the blend systems. Newly designed sequence test results show that the internal structures formed between PC and ABS polymers are dominant at low shear conditions for the blend ratio of 3:7 and effects of structural change and the presence of polybutadiene (PBD) become dominant at high shear conditions for pure ABS. The results of yield stress and relaxation time for PC/ABS blends support this phenomenon. The specimen with a blend ratio of 3:7 exhibited the highest value of yield stress at high temperature among others, which implies that the internal structure become stronger at higher temperature. The heterogeneity of ABS-rich blends increases whereas that of PC-rich blends decreases as temperature increases.
Language	English
Publishing date	2020-08-25
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2527146-5
ISSN	2073-4360 ; 2073-4360
ISSN (online)	2073-4360
ISSN	2073-4360
DOI	10.3390/polym12091916
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Article ; Online: Capsaicin inhibits HIF-1α accumulation through suppression of mitochondrial respiration in lung cancer cells.

Han, Tae-Hee / Park, Min Kyung / Nakamura, Hiroyuki / Ban, Hyun Seung

Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie

2021 Volume 146, Page(s) 112500

Abstract: Hypoxia inducible factor (HIF)-1α is an important transcription factor regulating cancer metabolism in hypoxic environment. Capsaicin is known to inhibit hypoxia-induced HIF activity in lung cancer. Hence, in this study we tried to elucidate its ... ...

Abstract	Hypoxia inducible factor (HIF)-1α is an important transcription factor regulating cancer metabolism in hypoxic environment. Capsaicin is known to inhibit hypoxia-induced HIF activity in lung cancer. Hence, in this study we tried to elucidate its inhibitory mechanism of action. In lung cancer cells, including H1299, H23, A549, and H2009 cells, capsaicin inhibited cell growth and HIF activation. Under hypoxic conditions, capsaicin reduced the accumulation of HIF-1α protein and the expression of its target genes, including pyruvate dehydrogenase kinase 1 (PDK1) and glucose transporter 1 (GLUT1), with no effect on overall HIF-1α mRNA levels in the H1299 cells. In addition, capsaicin increased intracellular oxygen levels by suppressing mitochondrial respiration, resulting in a reduction of HIF-1α accumulation. Furthermore, mitochondrial ATP production was reduced by capsaicin through the inhibition of mitochondrial respiration in the H1299, H23, A549, and H2009 cells. These results indicate that capsaicin potentially exhibits anticancer therapeutic effects in lung cancer under hypoxic conditions.
MeSH term(s)	3-Phosphoinositide-Dependent Protein Kinases/drug effects ; Capsaicin/pharmacology ; Cell Hypoxia/physiology ; Cell Line, Tumor ; Glucose Transporter Type 1/drug effects ; Humans ; Hypoxia-Inducible Factor 1, alpha Subunit/antagonists & inhibitors ; Lung Neoplasms/pathology ; Mitochondria/drug effects
Chemical Substances	Glucose Transporter Type 1 ; Hypoxia-Inducible Factor 1, alpha Subunit ; SLC2A1 protein, human ; 3-Phosphoinositide-Dependent Protein Kinases (EC 2.7.11.1) ; PDPK1 protein, human (EC 2.7.11.1) ; Capsaicin (S07O44R1ZM)
Language	English
Publishing date	2021-12-07
Publishing country	France
Document type	Journal Article
ZDB-ID	392415-4
ISSN	1950-6007 ; 0753-3322 ; 0300-0893
ISSN (online)	1950-6007
ISSN	0753-3322 ; 0300-0893
DOI	10.1016/j.biopha.2021.112500
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