A5047142523- Advanced Electron Microscopy Techniques and Applications
- Quantum Dots Synthesis And Properties
- Machine Learning in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- Catalytic Processes in Materials Science
- Force Microscopy Techniques and Applications
- Nanocluster Synthesis and Applications
- Temporomandibular Joint Disorders
- Ion-surface interactions and analysis
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Materials Characterization Techniques
- Copper-based nanomaterials and applications
- Near-Field Optical Microscopy
- Pharmacological Effects of Natural Compounds
- Laser Applications in Dentistry and Medicine
- Bioactive Compounds and Antitumor Agents
- scientometrics and bibliometrics research
- Alcohol Consumption and Health Effects
- Heme Oxygenase-1 and Carbon Monoxide
- Dental Anxiety and Anesthesia Techniques
- Cannabis and Cannabinoid Research
- Hemoglobin structure and function
- Electronic and Structural Properties of Oxides
- Delphi Technique in Research
- Bone and Dental Protein Studies
Seoul National University
2017-2025
Institute for Basic Science
2017-2025
Kwangwoon University
2024
Pusan National University Dental Hospital
2016
Government Communications Headquarters
2014
National Research Foundation of Korea
2014
Kyungpook National University
2009
Seeing subtle nanoparticle differences A challenge in the fabrication of nanoparticles is that even for particles uniform size, there will still be a distribution atomic arrangements and surface capping ligands from one particle to next. Using liquid-cell transmission electron microscopy, Kim et al. reconstructed structure individual nanocrystals synthesized batch while they were solution. comparison multiple showed structural heterogeneity between interior outer shell nanoparticles, as well...
Active sites and catalytic activity of heterogeneous catalysts is determined by their surface atomic structures. However, probing the structure at an resolution difficult, especially for solution ensembles nanocrystals, which consist particles with irregular shapes surfaces. Here, we constructed 3D maps coordination number (CN) generalized CN (CN_) individual atoms sub-3 nm Pt nanocrystals. Our results reveal that synthesized nanocrystals are enclosed islands nonuniform lead to complex...
Abstract In situ structures of Platinum (Pt) nanoparticles (NPs) can be determined with graphene liquid cell transmission electron microscopy. Atomic-scale three-dimensional structural information about their physiochemical properties in solution is critical for understanding chemical function. We here analyze eight atomic-resolution maps small (<3 nm) colloidal Pt NPs. Their are composed an ordered crystalline core surrounded by surface atoms comparatively high mobility. 3D...
Colloidal nanocrystals inherently undergo structural changes during chemical reactions. The robust structure-property relationships, originating from their nanoscale dimensions, underscore the significance of comprehending dynamic behavior in reactive media. Moreover, complexity and heterogeneity inherent atomic structures require tracking transitions individual at three-dimensional (3D) resolution. In this study, we introduce method time-resolved Brownian tomography to investigate temporal...
Algorithms for atomic-resolution 3D reconstruction of nanocrystals imaged in solution with electron microscopy are introduced.
The 3D atomic arrangements of materials determine the free energy landscape, thus governing physical and catalytic properties those materials. structures nanoparticles can deviate from periodic arrangement their bulk counterparts due to dominance surface dangling bonds, defects, dislocations. One approach understand structure resulting unique involves precise probing positions all constituent atoms individual nanoparticles. electron tomography Brownian one particle reconstruction allow...
Journal Article Network analysis to evaluate cross-disciplinary research collaborations: The Human Sensing Research Center, Korea Get access Chang Hoon Yang, Yang * 1 Department of Public Administration, Kwandong University, 522 Naegok-dong, Gangneung, Gangwon-do, 201-701, South *Corresponding author. Email: cy8064@gmail.com . Search for other works by this author on: Oxford Academic Google Scholar Jungeun Heo 2 Division National R&D Programs Planning, Foundation Korea, 165 Gajeong-ro,...
Abstract Determining the 3D atomic structures of multi-element nanoparticles in their native liquid environment is crucial to understanding physicochemical properties. Graphene cell (GLC) TEM offers a platform directly investigate solution phase. Moreover, exploiting high-resolution images single rotating GLCs, are reconstructed by method called “Brownian one-particle reconstruction”. We here introduce structure determination for nanoparticle systems. The method, which based on low-pass...
Drying a nanoparticle dispersion is versatile way to create self-assembled structures of nanoparticles, but the mechanism this process not fully understood. We have traced trajectories individual nanoparticles using liquid-cell transmission electron microscopy (TEM) investigate assembly process. Herein, we present protocols used for TEM studies self-assembly mechanism. First, introduce detailed synthetic produce uniformly sized platinum and lead selenide nanoparticles. Next, microfabrication...
Drying a nanoparticle dispersion is versatile way to create self-assembled structures of nanoparticles, but the mechanism this process not fully understood. We have traced trajectories individual nanoparticles using liquid-cell transmission electron microscopy (TEM) investigate assembly process. Herein, we present protocols used for TEM studies self-assembly mechanism. First, introduce detailed synthetic produce uniformly sized platinum and lead selenide nanoparticles. Next, microfabrication...
ABSTRACT Objective：The aim of this study was to determine whether methanol extract Do-Ki-Tang (DKT) inhibit free radical generation and production nitrite an index NO, PG E 2 , iNOS, COX-2 pro-inflammatory cytokines such as TNF-α, IL-1β, IL-6 MCP-1 in lipopolysacch aride (LPS)-stimulated RAW 264.7 macrophages.Methods：Cytotoxic activity on cells measured using 5-(3-caroboxymeth -oxyphenyl)-2H-tetra-zolium inner salt (MTS) assay. The express ion level inflammatory response-related proteins...
Purpose: The purpose of this study was to investigate occupational distribution temporomandibular disorders (TMD) patients and their diagnosis according occupations evaluate the relationship between TMD occupations. Work-related factors which might aggravate symptoms were also evaluated. Methods: We investigated 316 patients, aged from 13 65 years old, who had visited Department Oral Medicine in Pusan National University Dental Hospital. subjects have a job assessed using analysis...
2012년 7월부터 9월까지 부산대학교치과병원 구강내과에 내원하여 측두하악장애로 진단받은 후 행동치료, 약물치료, 물리치료, 교합안정장치 등 보존적 치료를 시행한 환자 137명을 대상으로 초진 시와 치료 3개월 후의 증상 및 임상소견을 비교, 평가하여 다음과 같은 결과를 얻었다. 1. 측두하악장애는 등의 치료에 의해 통증, 관절잡음, 개구제한 최대편이개구량이 현저히 개선되었다. 2. 따른 결과는 성별 급, 만성별로 유의한 차이 없이 3. 측두하악장애의 치료에서 물리치료와 약물치료만 경우보다 교합안정장치를 병행한 경우에서 임상 증상들의 개선이 현저하였다. 4. 근육장애군은 통증과 개구제한이 유의하게 개선되었고, 관절원판변위군은 관절잡음이 골관절염군에서는 모두 In order to evaluate the effect of conservative treatment for Temporomandibular Disorders(TMD), 137 patients were subjected...
Osteogenesis imperfecta is a systemic heritable disorder of connective tissues with the predominant manifestation spontaneous bone fractures.It features an abnormal biosynthesis collagen formation pathologic, immature collagen, resulting in triad brittle bones, blue sclera and hearing impairment.A 39-year-old woman osteogenesis began noticing loss as teenager.At time her presentation, she was aided by aid, which had been using for 25 years but not benefited from.Her temporal CT shows severe...
Abstract Properties of nanomaterials such as optical, electrical, and chemical properties are strongly correlated with lattice symmetry, making characterization symmetry essential. We introduce a analysis method using 3D atomic coordinates obtained by Brownian one‐particle reconstruction. The allows direct quantitative symmetrical delivers local structural characteristics individual platinum (Pt) nanoparticles in unit‐cell level. Local deformations the Pt distortion internal breakage...
High-throughput analysis of ligand adsorption on metal nanoparticles revealed that dispersion interactions largely affect the optimal energy and configuration.
의원성의 외상 혹은 감염은 신경 손상의 중요한 원인 중 하나이며, 이는 의사-환자 관계에 매우 큰 영향을 주는 일로 여겨진다. 관련 치과 술식의 예로는 임플란트 시술시 직접적인 열에 의한 손상, 근관치료시의 약제 유출, 발치시의 외력, 전달국소마취시 바늘에 외상, 악골 수술로 인한 등이 있다. 이러한 신경손상이 발생하지 않도록 위험군 예측 및 시술 시 주의가 필요하며, 손상 조기 발견을 통해 제대로 대처하지 않으면 만성적 신경병증으로 발전할 수 있는 가능성이 높아질 있으므로 그 징후를 신속히 파악하고 적절히 관리하는 것이 중요하다.
Journal Article The Structures of Small (< 3 nm), Solubilized Platinum Nanocrystals are Composed an Ordered Core Surrounded by Mobile Surface Atoms Get access Henry Wietfeldt, Wietfeldt Center for Structural Biology, Cancer Research, National Institute, Frederick, MD, USA Search other works this author on: Oxford Academic Google Scholar Chiara Machello, Machello Department Biochemistry and Molecular Biomedicine Discovery Monash University, Melbourne, Victoria, Australia Cong T S Van, Van...
Abstract To acquire a crystal-clear structure-performance relation for heterogeneous nanocatalysts, precise tracking of the structural evolution from precursor to final product in real time and space domain is important but also extremely challenging. In archetype preparation, thermal treatment crucial step activation. Especially, colloidally synthesized nanoparticles, ligand detachment process expose surfaces completed with treatment. Here, we track three-dimensional atomic change...
Nanoparticle surfaces are passivated by surface-bound ligands, and their adsorption on synthesized nanoparticles is complicated because of intricate low-symmetry surface structures. Thus, it challenging to precisely investigate ligand nanoparticles. Here, we applied a machine-learning-accelerated ab-initio calculation into experimentally resolved 3D atomic structures Pt analyze the complex behavior polyvinylpyrrolidone (PVP) ligands Different angular configurations large-sized thoroughly...
Abstract Determining the 3D atomic structures of multi-element nanoparticles in their native liquid environment is crucial to understanding physicochemical properties. We here introduce a structure determination method for nanoparticle systems. The method, which based on low-pass filtration and initial model generation customized different types systems, enables reconstruction high-resolution Coulomb density maps ordered disordered systems classification heteroatom type. Using image datasets...