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Kim, Nahae,Li, Xinlin,Kim, Se Hyun,Kim, Juyoung THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.68 No.-
<P><B>Abstract</B></P> <P>Colloidally stable organic–inorganic (O–I) hybrid nanoparticles could be prepared using an alkoxysilane-functionalized amphiphilic polymer (AFAP) precursor. O–I hybrid sols could maintain colloidal stability for six months even at 45% solid content and be coated onto glass as well as PET film to form transparent O–I hybrid films. The formation of O–I hybrid nanoparticles dispersed in cured coating films could be confirmed using scanning electron microscopy. The cured coating film showed 3H and 5H pencil hardness on PET and glass, respectively. Nanoindentation measurements also showed that their modulus and hardness was varied with the type of AFAP used in its preparation</P>
실란 기능화 양친성 고분자 전구체를 이용한 소수성 항균물질 담지 나노 입자 제조 및 항균 특성
김나혜 ( Nahae Kim ),김주영 ( Juyoung Kim ) 한국접착및계면학회 2017 접착 및 계면 Vol.18 No.1
본 연구에서는 50 wt%의 매우 높은 담지량과 70%의 높은 고형분을 가지면서도 물속이나 다양한 제품에 나노 입자 형태로 분산이 가능한 새로운 형태의 소수성 항균 물질 담지 나노 입자를 제조하였다. 실란 기능화 양친성 고분자 전구체(Alkoxysilane-functionalized Amphiphilic Polymer Precursor; 이하 AAPP)와 다양한 실란 화합물을 이용하여 전형적인 Hydrolytic Sol-Gel 공정으로 제조된 수분산 유-무기 하이브리드 나노 입자들을 제조하고, 이를 이용하여서 나노 침전법을 사용하여서 소수성 항균물질을 고함량으로 담지할 수 있는 새로운 공정으로 소수성 항균물질인 Eugenol이 담지된 유-무기 하이브리드 형태의 나노입자 제조하였다. 나노 입자 제조시 제조 조건의 변화에 따른 나노 입자들의 크기, 담지량, 항균 활성 및 방출거동 등에 영향을 미치는 인자들을 조사하였다. 나노 입자의 종류에 관계없이 Minimal Inhibitory Concentration (MIC)는 50 mg/ml로 동일하였고, 모든 균주에서 99 %에 해당하는 우수한 항균력과 Pseudomonas aeruginosa (PSE)를 제외하고는 2주 이상의 항균 지속력을 나타내었다. 특히, Tetraethoxysilane (TEOS)를 첨가한 경우에는 견고한 무기물 도메인으로 인해 가장 높은 담지량 (50 wt.%)과 서방출 (Sustained release)을 나타내었고, Hexanediol (HD)을 첨가한 경우에는 HD 자체의 항균력과 용매로서의 역할도 하였기 때문에 가장 높은 항균력과 70%의 고형분을 나타내었다. In this study, nanoparticles which encapsulated hydrophobic antimicrobial compounds with 50wt% of payload and 70%of solid content were prepared. These nanoparticles could be dispersed at water as well as various medium. Water dispersible organic-inorganic (O-I) hybrid nanoparticles were first prepared using alkoxysilane-functionalized amphiphilic polymer precursors through a conventional sol-gel process. Hydrophobic antimicrobial compound, Eugenol encapsulated nanoparticles were prepared using these O-I hybrid nanoparticles through a new nanoprecipitation process. The effect of various preparation on the size of nanoparticles, amount of payload, antimicrobial activity, and release rate of encapsulated compounds was investigated. All eugenol-encapsulated O-I nanoparticles regardless of preparation condition showed the same minimal inhibitory concentration (MIC) (50mg/ml) and 99% of antimicrobial activity for every strain. Their antimicrobial activity could maintain longer than two weeks. Especially, eugenol-encapsulated O-I nanoparticles prepared using tetraethoxysilane (TEOS) exhibited the highest payload (50wt%) and the lowest release rate which was owing to higher inorganic content in the O-I nanoparticles. And these O-I nanoparticles dispersed in hexanediol (HD) showed the highest antimicrobial activity and solid content (70wt%) because HD acted as a solvent as well as a antimicrobial agent.
코아 가교 양친성 고분자 나노입자를 이용한 고함량 유용 약물 담지 고분자 나노입자 제조
김나혜 ( Nahae Kim ),김주영 ( Juyoung Kim ) 한국공업화학회 2016 공업화학 Vol.27 No.1
In this study, core-crosslinked amphiphilic polymer (CCAP) nanoparticles prepared using a reactive amphiphilic polymer precursor (RARP) were used for preparing some valuable compounds encapsulated polymer nanoparticles with high payload through nanoprecipitation process. Various solvents (acetone, ethanol, and THF) having different polarity and CCAP nanoparticles prepared using different amphiphilicity were used for the preparation of α-tocopherol encapsulated polymer nanoparticles to investigate their effects on the encapsulation efficiency, payload, nanoparticle size, and stability. CCAP dissolved in hydrophobic solvent, THF, could formα-tocopherol encapsulated polymer nanoparticles dispersed in water with the high payload of α-tocopherol and encapsulation efficiency. Because of their physically and chemically robust nano-structure originated from crosslinking of the hydrophobic core, CCAP nanoparticles could encapsulate α-tocopherol with the high payload (33 wt%) and encapsulation efficiency (97%), and form 70 nm-sized stable nanoparticles in water.
김태구(Taegu Kim),윤나혜(Nahae Yun),김연주(YeonJoo Kim),박인철(Inchul Park),심동혁(Donghyouk Shim) 한국산업경영시스템학회 2022 한국산업경영시스템학회지 Vol.45 No.1
Development of a long-range artillery intercept system to counter the threat of enemy long-range artillery is in progress. This intercept system is a complex combination of several components. In addition, the ability to engage simultaneously is emphasized due to the characteristic of having to respond to numerous enemy bullets. In this study, the performance according to the arrangement of the detection asset and missile launchers, which are key components of the system, is analyzed. A simulation experiment was performed assuming the enemy attack at various azimuth and launch angles. As a result of the analysis, the radar seems to provide sufficient detection capability in any situation, but in the case of the launcher, the effect of the enemy s launch angle can be critical. It is recommended to place both radar and launchers behind the protection target.
Baek, Yonghwa,Li, Xinlin,Kim, Nahae,Park, Chan Eon,An, Tae Kyu,Kim, Juyoung,Kim, Se Hyun The Royal Society of Chemistry 2019 Journal of materials chemistry. C, Materials for o Vol.7 No.37
<P>The sol-gel method is a low-temperature, highly controllable and cost-effective method for producing homogeneous and high-quality ultrafine nanostructured thin films. Despite these advantages, sol-gel derived gate dielectrics have received little attention. Here, we synthesized a sol-gel derived organic-inorganic (O-I) hybrid gate dielectric (AGPTi) and demonstrated the stability and flexibility of organic thin-film transistors (OTFTs) made with it. The AGPTi film was simply fabricated from three conventional precursors, namely (3-glycidyloxypropyl)trimethoxysilane (GPTMS), propyltrimethoxysilane (PTMS), and titanium(iv) isopropoxide (TTiP), and a newly synthesized alkoxysilane-functionalized amphiphilic polymer (AFAP) under mild conditions (120 °C for 60 min). This research revealed several important benefits of including such an amphiphilic polymer in sol-gel derived O-I hybrid gate dielectrics: a considerable enhancement of sol stability; an ability to achieve a high-quality thin film with elaborate structures of small nanoclusters; and a dramatic improvement of adhesion, leakage current density of gate dielectrics, electrical stability and flexibility of devices. We expect this study to open up new applications for O-I hybrid materials in flexible electronics.</P>
Jang, Jin Hyuk,Kim, Nahae,Li, Xinlin,An, Tae Kyu,Kim, Juyoung,Kim, Se Hyun Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.475 No.-
<P><B>Abstract</B></P> <P>In this work, we reported excellent plasma-enhanced atomic layer deposition (PEALD)-based Al<SUB>2</SUB>O<SUB>3</SUB>/organic-inorganic (O-I) nanohybrid gas barrier film which exhibits ultralow water vapor transmission rate (WVTR), high activation energy for permeation, high optical transmission in visible light and sufficient flexibility. The values of WVTR and activation energy for permeation of our PEALD-based Al<SUB>2</SUB>O<SUB>3</SUB>/O-I nanohybrid 4 pair gas barrier film are obtained to be 7.83 × 10<SUP>−5</SUP> g/m<SUP>2</SUP>/day (60 °C, 90% RH) and 103.10 kJ/mol via the electrical calcium test. Optical transmission in visible light is 96.14% and critical bending radius 7 mm–9 mm. Introduction of O-I nanohybrid layers between PEALD-based Al<SUB>2</SUB>O<SUB>3</SUB> layers improved the properties of gas barrier films on anticorrosion, adhesion, and flexibility.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We demonstrated excellent Al<SUB>2</SUB>O<SUB>3</SUB>/organic-inorganic (O-I) nanohybrid gas barrier film. </LI> <LI> This barrier film provides good adhesion between O-I nanohybrid and Al<SUB>2</SUB>O<SUB>3</SUB> layers. </LI> <LI> This flexible and transparent film exhibits ultralow WVTR (7.83 × 10<SUP>−5</SUP> g/m<SUP>2</SUP>/day). </LI> </UL> </P>