http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Magnetic field-assisted self-assembly of magnetoplasmonic nanoparticles and chiroptical properties
정기재,이동규,이재범 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The origin of chirality is coming from the structural asymmetry. Chiral structures such as helix have no any symmetric point, line, and plane. So it cannot be overlapped with its symmetric images. This figures can give different interactions with right- and left-handed circular polarized light. Here, we fabricated nature-inspired helix-mimetic optical activity modulator with self-assembled magnetoplasmonic nanochains. In the polymer gel and solution, we can assemble magnetic nanochain by external magnetic field. In addition, we can control its structures by physical force and magnetic field arrangement. As a results, circular dichroism signal intensities and sign can be changed.
정기재,이재범 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Chitosan is one of promising polymers for applications in various fields. However, despite diverse research studies conducted on its biocompatibility, its uses are still limited. The main factor that can affect its physical, chemical and biological properties is the degree of deacetylation (DOD), which represents the proportion of deacetylated units in the polymer. In this article, the in vivo biocompatibility of chitosan-hydroxyapatite composite films composed of chitosan with different DOD values was. The chitosan with the higher DOD induced a higher incidence of inflammation. This basic study on the relationship between the DOD and inflammation is valuable for the development of further chitosan-based researches.
정기재,이재범 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Chitosan is one of promising polymers for applications in various fields. However, despite diverse research studies conducted on its biocompatibility, its uses are still limited. The main factor that can affect its physical, chemical and biological properties is the degree of deacetylation (DOD), which represents the proportion of deacetylated units in the polymer. In this article, the in vivo biocompatibility of chitosan-hydroxyapatite composite with different DOD values of chitosan was investigated. The chitosan with the higher DOD induced a higher incidence of inflammation in skin cells. This basic study on the relationship between the DOD and inflammation is valuable for the development of further chitosan-based researches.
Synthesis of viral-magnetic Janus nanoparticles at the soft-hard interfaces
정기재,황다정,이재범 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Janus nanoparticles (JNPs) are unique building blocks which have asymmetric structures. Typical silver nanoparticles which are spherical shapes, for example, are composed of silver themselves and surface is homogeneous. However, JNPs are formed by heterogeneous surface; half of side is different from another side. They have been attracted and studied because of their different chemical or physical properties. For instance, their asymmetry give chiral properties. When we synthesis JNPs using magnetic nanoparticles (MNPs), they are able to be arrayed in magnetic field. Asymmetry and magnetic properties offer efficient and distinctive methods to target complex self-assembled materials. Here, we made Janus magnetic nanoparticles with Fe3O4. We coated half of surface with gold through sputtering followed by coordination of M13 bacteriophages and made them be arrayed by magnetic field. JNPs we made seem shuttlecock shapes.
Synthesis of whitlockite nanocrystals as bone regenerative materials
정기재,이재범 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Diversification of materials and its shape is important in materials science and can be a strong tool for various applications. Especially in orthopedic and dental research area, materials have been confined in hydroxyapatite and β-tricalcium phosphate (β-TCP, Ca3(PO4)2) as inorganic ceramic materials for bone replacement or regeneration. whitlockite is a kind of calcium phosphate existing in natural bone tissue and contains Mg. Mechanism and the important roles as well as the applications of WH have not been fully investigated due to the difficulty in synthesizing single-phase WH nanostructured materials. Here we report easy and simple method to synthesis whitlockite by using hydrothermal method and synthetic conditions for morphology control.
지문의 키랄성: 탄성 격자 메타 스킨의 패턴 및 곡률로 인한 새로운 키랄광학 특성
곽주용,이재범,정기재 한국과학수사학회 2022 과학수사학회지 Vol.16 No.4
지문에서 영감을 얻은 2차원(2D) 메타표면은 그동안 연구되지 않았던 재구성 가능한 키랄메타 표면의 한계를 극복할 수 있었다. 지문은 독특한 패턴(P)과 곡률(T)을 가지고 있는데 이를 조합하여 대칭성을 파괴하고 키랄성을 나타낼 수 있었다. 뿐만 아니라, 이를 활용해 손쉬운 나노임프린팅 방법으로 지문모방 탄성격자 메타스킨(Elastomeric grating meta-skin, EGMS)을 제작할 수 있었다. 일정한 나노 단위의 P를가지는 그레이팅으로 손쉽게 PDMS에 전사 할 수 있었으며, Au를 얇게 도포하여 빛과의 상호작용을 유도해 표면 플라즈몬 공명 현상을 발생시켰다. 그리고 특정 각도로 곡률을 가하여 패턴과 곡률이 형성하는 스큐 각도(skew angle, θ)를 조작함으로써 원편광 이색성을 통해 광학 키랄성이 조절될 수 있음을 확인하였다. 이러한 현상은 지문에서도 확인할 수 있는데, 본 연구에서는 지문에서도 가질 수 있는 독특한 패턴과곡률이 형성하는 스큐각도는 키랄성을 가지며 이는 사람마다 다르게 분포한다는 것을 원편광 이색성과 시뮬레이션을 통하여 최초로 증명하는데 성공하였다.
Simulational study for plasmonic spinner in laser system with tunable wavenumber
이동규,이재범,정기재,( Tran Van Tan ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Nanomachines are synthetic assemblies that switch between defined molecular conformations upon stimulation by external triggers. It is well known that assembled nanoparticles made new localized surface plasmonic modes and this can be observed as light absorbance on specific wavelength and chirality of the assembled structure can be detected by circular dichroism. The concept suggested in this presentation shows one type of 4D self-assembly which means controlling the dynamicity of the arrays of nanoparticles. Not only taking snapshots of moving nanostructures, movement of nanostructure can be remote controlled. Between two layers of 1D structured nanoarray with an angle, rotational mode of the particles between the layers can be reversibly controlled by tuning the wavenumber in that area. This work is considerable to use in tunable plasmonic devices, which can be used as nanomachines, chemical sensors and telecom applications.
Optical Anisotropicity of Core-Shell or Yolk-Shell-typed Ag@Fe3O4 Nanochains
TRANVANTAN,김정효,김종혁,이동규,정기재,이재범 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.11
Optical anisotropicity of 1-dimensional nanochains of yolk-shell (YOSH) and core-shell (COSH) Ag@Fe3O4 nanoparticles (NPs) is attractive to comprehend electromagnetic relation in different materials in nanoscale regime. To investigate its unique properties, a YOSH Ag@Fe3O4 nanoscale superstructure is prepared through a successive process using COSH-NPs via a selective etching approach. The Ag-core can be etched when exposed to a mixture of polyvinylpyrrolidone (PVP) and hydrogen peroxide (H2O2) solution at 25°C. It is investigated that the etching degree of Ag-core in the COSH-NPs is linearly correlated with the average molecular weight and amount of PVP and H2O2. In the optical investigation, one-dimensional YOSH and COSH nanochains are compared to show the dependence of anisotropic plasmonic response on tuning polarized light angle. The YOSH nanochain shows an insensitive plasmonic shift in respect of varying refractive index of solvent, which is probably related with the void of Ag-yolk and Fe3O4 shell. It is probable that the unique properties of the COSH and YOSH nanochain can be applied to be a potential photonic device and their ultralow quantity sensing and imaging.