Ki‐Jae Jeong

National Center for Nanoscience and Technology

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Jaebeom Lee

Kyung Hee University

Van Tan Tran

Phenikaa University

Jaebeom Lee

Chungnam National University

Cai‐Feng Wang

Nanjing Tech University

Jeonghyo Kim

VSB - Technical University of Ostrava

Lemma Teshome Tufa

Adama Science and Technology University

Juyong Gwak

Chungnam National University

Zhiyong Tang

National Center for Nanoscience and Technology

Jieun Kang

Vanderbilt Health

Young-Mi Kim

Chungnam National University

Cooperative Institutions

Pusan National University

Chungnam National University

Pohang University of Science and Technology

National Center for Nanoscience and Technology

Pusan National University Hospital

Government of the Republic of Korea

Korea Food Research Institute

Shanghai University

Pusan National University Dental Hospital

Korea Advanced Institute of Science and Technology

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Highly stable functionalized aluminum nanoparticles for magneto-energetic composite fabrication

Combustion and Flame (2017)

Van Tan Tran Ji Hoon Kim Ki‐Jae Jeong Jun‐Young Kwon Soo Hyung Kim

Dispersity

Triethoxysilane

Oxidizing agent

Surface Modification

Silanization

Iron oxide nanoparticles

10.1016/j.combustflame.2017.09.014

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Citations (11)

Whitlockite Granules on Bone Regeneration in Defect of Rat Calvaria

ACS Applied Bio Materials (2020)

Won-Bum Lee Cai‐Feng Wang Jung-Han Lee Ki‐Jae Jeong Yoon-Seo Jang

Whitlockite (WH; Ca18Mg2(HPO4)2(PO4)12) is a calcium phosphate based ceramic that contains magnesium ions. As the second most abundant mineral in living bone, WH occupies 25-35 wt % of the inorganic portion of human bone. Compared to hydroxyapatite (HAp, Ca10(PO4)6(OH)2), WH possesses better mechanical properties, faster resorbability, and promotion behavior on the osteogenesis. In this article, we introduced a fabrication method of interconnected porous WH granules through vacuum filtration, followed by sintering treatment based on the thermal stability of WH synthesized using the tri-solvent system. This study presents a histological, radiological, and immunohistochemical evaluation of the bone healing potential of these WH granules in a 5 mm diameter calvarial bone defect in rats. The histological evaluation shows no inflammation or foreign body reaction in the WH group. The WH group displays newly formed bone at the same thickness as the original bone. On the contrary, bone formation is not observed in the nontreated (NT) group. Besides, immunohistochemistry (IHC) confirmed that WH granules promoted bone regeneration with the significantly higher expression of bone morphogenetic proteins-2 (BMP-2), alkaline phosphatase (ALP), osteopontin (OPN), and osteocalcin (OCN) compared to the NT group without the addition of exogenous cells or growth factors. These results suggest that WH has excellent potential for application in bone tissue regeneration.

Calvaria

Whitlockite

Osteopontin

Bone tissue

10.1021/acsabm.0c00960

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Citations (17)

Plasmonic Enhancement of Chiroptical Property in Enantiomers Using a Helical Array of Magnetoplasmonic Nanoparticles for Ultrasensitive Chiral Recognition

ACS Applied Materials & Interfaces (2021)

Juyong Gwak Se Jeong Park Hwa Young Choi Ji Hoon Lee Ki‐Jae Jeong

Recognition of enantiomeric molecules is essential in pharmaceutical and biomedical applications. In this Article, a novel approach is introduced to monitor chiral molecules via a helical magnetic field (hB), where chiral-inactive magnetoplasmonic nanoparticles (MagPlas NPs, Ag@Fe3O4 core-shell NPs) are assembled into helical nanochain structures to be chiral-active. An in-house generator of hB-induced chiral NP assembly, that is, a plasmonic chirality enhancer (PCE), is newly fabricated to enhance the circular dichroism (CD) signals from chiral plasmonic interaction of the helical nanochain assembly with circularly polarized light, reaching a limit of detection (LOD) of 10-10 M, a 1000-fold enhancement as compared to that of conventional CD spectrometry. These enhancements were successfully observed from enantiomeric molecules, oligomers, polymers, and drugs. Computational simulation studies also proved that total chiroptical properties of helical plasmonic chains could be readily changed by modifying the chiral structure of the analytes. The proposed PCE has the potential to be used as an advanced tool for qualitative and quantitative recognition of chiral materials, enabling further application in pharmaceutical and biomedical sensing and imaging.

Chirality

10.1021/acsami.1c14047

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Citations (14)

Chirality of Fingerprints: Pattern- and Curvature-Induced Emerging Chiroptical Properties of Elastomeric Grating Meta-Skin

ACS Nano (2022)

Ki‐Jae Jeong Juyong Gwak Cai‐Feng Wang Young-Mi Kim Van Tan Tran

Fingerprint-inspired elastomeric grating meta-skin (EGMS) is herein fabricated to investigate the chirality of fingerprints. The EGMS is made by a facile nanoimprinting method with a diffraction grating as a template using polydimethylsiloxane, followed by gold deposition. The chirality of the surface is caused by symmetry breaking, induced by the pattern (P) and curvature (T). Furthermore, the chiroptical properties of EGMS are reconfigurable through the control of the skew angle (θ), which is the angle between P and T. The chiroptical properties of a fingerprint are also shown and interpreted in this perspective. On the basis of the results, we suggest the strategy to impart chirality on the surface, which is reconfigurable by controlling P and T. It will be a useful method to produce chirality in membranes, thin films, metasurfaces, and 2D nanomaterials, as well as advance biometric recognition.

Chirality

Polydimethylsiloxane

10.1021/acsnano.1c11597

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Citations (7)

Rapid Assembly of Magnetoplasmonic Photonic Arrays for Brilliant, Noniridescent, and Stimuli‐Responsive Structural Colors

Small (2022)

Van Tan Tran Jeonghyo Kim Sangjin Oh Ki‐Jae Jeong Jaebeom Lee

Abstract There are usually trade‐offs between maximizing the color saturation and brightness and minimizing the angle‐dependent effect in structural colors. Here, a magnetic field‐induced assembly for the rapid formation of scalable, uniform amorphous photonic arrays (APAs) featuring unique structural colors is demonstrated. The magnetic field plays a fundamental role in photonic film formation, making this assembly technology versatile for developing structural color patterns on arbitrary substrates. The synergistic combination of surface plasmonic resonance of the Ag core and broadband light absorption of high refractive index (RI) Fe 3 O 4 shell in hybrid magnetoplasmonic nanoparticles (MagPlas NPs) enables breaking the trade‐offs to produce brilliant, noniridescent structural colors with high tunability and responsiveness. These features enable the fabrication of various types of highly sensitive and reliable colorimetric sensors for naked‐eye detection without sophisticated instruments. Furthermore, large‐scale structural color patterns are effortlessly achieved, demonstrating the high potential of the present approach for full‐spectrum displays, active coatings, and rewritable papers.

Structural Coloration

Naked eye

10.1002/smll.202200317

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Citations (27)

Helical Magnetic Field-Induced Real-Time Plasmonic Chirality Modulation

ACS Nano (2020)

Ki‐Jae Jeong Dong Kyu Lee Van Tan Tran Cai‐Feng Wang Jiawei Lv

The astrophysical phenomenon of mimetic helical magnetic field (hB)-assisted self-assembly is herein introduced to build helical superstructures that display chiroptical properties. As a building block, magnetoplasmonic (MagPlas) Ag@Fe3O4 core–shell nanoparticles are used to guide plasmonic Ag nanoparticles onto a helical magnetic flux. The chirality of the assembled helical structures and tailored circular dichroism are successfully tuned in real time, and the handedness of the assembled structures is dynamically switched by the hB at the millisecond level, which is at least 6000-fold faster than other template-assisted methods. The peak position of circular dichroism can be reconfigured by altering the plasmonic resonance or coupling by controlling the size of the Ag core and magnetic flux density. The hB-induced chirality modulation represents a method to control the polarization state of light at the nexus of plasmonics, magnetic self-assembly, colloidal science, liquid crystals, and chirality. It presents active and dynamic chiral assemblies of magnetoplasmonic nanomaterials, enabling further practical applications in optical devices.

Chirality

Plasmonic Nanoparticles

10.1021/acsnano.0c02026

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Citations (53)

Electrochemical Investigation of Porosity in Core–Shell Magnetoplasmonic Nanoparticles

The Journal of Physical Chemistry Letters (2022)

Lemma Teshome Tufa Van Tan Tran Ki‐Jae Jeong Birhanu Bayissa Gicha Bedasa Abdisa Gonfa

Porous core-shell nanoparticles (NPs) have emerged as a promising material for broad ranges of applications in catalysts, material chemistry, biology, and optical sensors. Using a typical Ag core-Fe3O4 shell NP, a.k.a., magnetoplasmonic (MagPlas) NP, two porous shell models were prepared: i.e., Ag@Fe3O4 NPs and its SiO2-covered NPs (Ag@Fe3O4@SiO2). We suggested using cyclic voltammetry (CV) to provide unprecedented insight into the porosity of the core-shell NPs caused by the applied potential, resulting in the selective redox activities of the core and porous shell components of Ag@Fe3O4 NPs and Ag@Fe3O4@SiO2 NPs at different cycles of CV. The porous and nonporous core-shell nanostructures were qualitatively and quantitatively determined by the electrochemical method. The ratio of the oxidation current peak (μA) of Ag to Ag+ in the porous shell to that in the SiO2 coated (nonporous) shell was 400:3.2. The suggested approach and theoretical background could be extended to other types of multicomponent NP complexes.

10.1021/acs.jpclett.2c01201

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Citations (2)

Reconfigurable Metasurface of Magnetoplasmonic Microbundle Array for Chiral Signal Enhancing

Advanced Optical Materials (2022)

Juyong Gwak Huu‐Quang Nguyen Ki‐Jae Jeong Young-Mi Kim Se Jeong Park

Abstract Novel design of flexible chiral metasurface has been attractive to control electromagnetic dynamics for fabricating integrated enantiomeric sensing devices. In this article, a reconfigurable metasurface decorated with planar magnetoplasmonic microbundle arrays of Au@Fe 3 O 4 core‐shell nanowires (NWs) on polydimethylsiloxane film is fabricated. Its chiroptical property is willingly manipulated by skew angle (θ), that is, the angle between applied magnetic field vector ( B ) and tangent vector ( T ) of a curved metasurface. Interestingly, the as‐prepared NW metasurface presents many internal skew angles (θ in ) among respective NWs at nanoscale as well as additional external skew angle (θ ex ) among arrays at microscale, extraordinarily enhancing chiroptical signal compared to other nanosphere or single NW arrays where lack of θ in is observed. Computational simulation proves the disruption of the symmetry via distinct θ in and θ ex of the aligned microbundle array. In addition, the optical chirality induced by θ in could be analysed by magnetic circular dichroism (MCD). These results suggest a strategy to implement spectacle lenses with circular polarizer capabilities and the fabricated metafilm specifically modulates the absorption of circularly polarized light and can become a novel universal means to produce flexible devices for further signal enhancing at nanoantennas and biosensors.

Polarizer

Microscale chemistry

Chirality

Nanopillar

SIGNAL (programming language)

10.1002/adom.202202104

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Citations (3)

Homogenization and thermoelastic analysis of heterogenous materials with regular and random microstructures

Composites Part B Engineering (2012)

Jong-Rae Cho Y.J. Kang Ki‐Jae Jeong Yoojeong Noh O. K. Lim

Homogenization