• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.865-867
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• 2009

In this paper, we describe the fabrication of nano-scale ink particles with narrow size distribution to offer high optical density in electrophoretic display applications. Charged white ($TiO_2$ and polyester) and black (carbon black and polyester) nano size ink particles in size range of 200 ~ 700nm were made successively using modified non-aqueous base emulsion process. The EPD showed white reflectance of 58% and saturation voltage of ${\pm}10V$.

• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2003년도 추계총회 및 연구발표회 초록집
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• pp.80.1-80
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• 2003

• 한국응용과학기술학회지
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• 제29권2호
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• pp.238-247
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• 2012

식품산업에서의 나노기술은 많은 연구와 가능성 있는 제품으로 새롭게 각광받는 분야이다. 나노와 마이크로 크기의 고체 입자는 유화된 오일 또는 물 입자를 함유하는 분산계의 처방에 적용 가능성이 매우 높은 것으로 인식되고 있다. 본 논문은 식용의 지방 결정, 실리카 나노 입자 및 생체 유래의 나노 결정체에 기반을 둔 식품 에멀젼의 성질과 개발에 관한 리뷰논문으로 다양한 피커링 안정화 분야에 관하여 검토하였다. 특히, 단백질로 안정화된 일반적인 에멀젼과 비교하여 Pickering 안정화 입자에 대해 초점을 맞추고자한다. 또한, 식품 산업에서 이들의 응용 예를 다루고자한다.

• 공업화학
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• 제32권1호
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• pp.110-116
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• 2021

In this work, the surface of hydrophilic cellulose nanofibrils (CNFs) was modified precisely by varying amounts of cetyltrimethylammonium bromide (CTAB) to produce CNF-based particle surfactants. We found that a critical CTAB density was required to generate amphiphilic CTAB-grafted CNF (CNF-CTAB). Compared to pristine CNF, CNF-CTAB was highly efficient at stabilizing oil-in-water Pickering emulsions. To evaluate their effectiveness as particle surfactants, the surface coverage of oil-in-water emulsion droplets was determined by changing the CNF-CTAB concentration in the aqueous phase. Furthermore, styrene-in-water stabilized by CNF-CTAB surfactants was thermally polymerized to produce CNF-stabilized polystyrene (PS) particles, offering a great potential for various applications including pharmaceuticals, cosmetics, and petrochemicals.

• 폴리머
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• 제37권1호
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• pp.28-33
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• 2013

잘토프로펜은 프로피온산 유도체인 비스테로이드성 소염진통제로서 카라기난, 나이스타틴에서 유발된 급성염증에 큰 억제 효과를 가지고 있을 뿐만 아니라 급성 및 만성 염증에도 효과를 가지고 있다. 초기 방출 및 지속적인 방출을 위해서 잘토프로펜이 함유된 폴리옥살레이트(POX)와 PLGA 미립구를 각각 O/W 용매증발법으로 제조 후 각각의 미립구의 혼합비율을 달리하였다. 주사현미경, X선 회절 분석법, 시차 주사 열량계, 그리고 적외선 분광 분석기를 이용하여 잘토프로펜이 함유된 미립구의 물리화학적 성질 및 표면형태를 조사하였다. POX 미립구의 혼합비율이 증가할수록 초기 약물방출이 증가하며, PLGA 미립구의 혼합비율이 증가할수록 느린 약물방출을 보인다. 본 연구에서 초기 약물방출량이 높은 POX 미립구를 PLGA 미립구와 혼합비율을 조절함으로써 약물이 함유된 미립구의 초기방출 계수를 제어할 수 있을 것으로 사료된다.

• 한국세라믹학회지
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• 제54권2호
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• pp.102-107
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• 2017

The dependence of the IR optical properties of PMMA/$Al_2O_3$ nanocomposite on the alumina content was investigated in the wavelength range of $3500-2800cm^{-1}$. The samples were prepared via emulsion polymerization technique using oleic acid as a coupling agent. Grafting density calculations were carried out by means of elemental analysis CHN to yield the best coupling agent content. FTIR analysis confirmed the existence of a chemical bond between aluminum oxide and oleic acid. The outcomes of XRD analyses showed the presence of cubic gamma aluminum oxide in the nanocomposite, in contrast to the amorphous nature of PMMA. TEM images showed the core-shell morphology of the particles other than pristine PMMA. Optical constants of the nanocomposite were calculated based on FTIR spectra and the Kramers-Kronig equations. The presence of nano alumina modified some of the optical indexes in IR region.

• 한국재료학회지
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• 제22권6호
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• pp.298-302
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• 2012

Fe/$SiO_2$ core-shell type composite nanoparticles have been synthesized using a reverse micelle process combined with metal alkoxide hydrolysis and condensation. Nano-sized $SiO_2$ composite particles with a core-shell structure were prepared by arrested precipitation of Fe clusters in reverse micelles, followed by hydrolysis and condensation of organometallic precursors in micro-emulsion matrices. Microstructural and chemical analyses of Fe/$SiO_2$ core-shell type composite nanoparticles were carried out by TEM and EDS. The size of the particles and the thickness of the coating could be controlled by manipulating the relative rates of the hydrolysis and condensation reaction of TEOS within the micro-emulsion. The water/surfactant molar ratio influenced the Fe particle distribution of the core-shell composite particles, and the distribution of Fe particles was broadened as R increased. The particle size of Fe increased linearly with increasing $FeNO_3$ solution concentration. The average size of the cluster was found to depend on the micelle size, the nature of the solvent, and the concentration of the reagent. The average size of synthesized Fe/$SiO_2$ core-shell type composite nanoparticles was in a range of 10-30 nm and Fe particles were 1.5-7 nm in size. The effects of synthesis parameters, such as the molar ratio of water to TEOS and the molar ratio of water to surfactant, are discussed.

• 대한화장품학회지
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• 제38권3호
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• pp.201-207
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• 2012

Oil-in-ethanol (O/E) 마이크로에멀젼을 물에 희석하여 얻은 O/W 나노에멀젼의 성질에 대하여 다른 희석 과정의 영향을 연구하였다. 물/에탄올/비이온성계면활성제/실리콘 오일 계를 모델 계로 선택하였다. 희석과정은 물(또는 마이크로에멀젼)을 마이크로에멀젼(또는 물)에 단계별로 첨가하는 방법으로 구성되었다. O/E 마이크로에멀젼을 물에 첨가하여 혼합하면 30 nm 정도의 입경을 가진 나노에멀젼을 얻을 수 있었다. 반면에 물을 O/E 마이크로에멀젼에 첨가하면 400 nm의 입경을 가진 에멀젼을 얻을 수 있다. 희석 방법이 얻어지는 에멀젼의 성질에 중요한 역할을 하였다. 시간에 따른 나노에멀젼의 입자 변화는 관찰되지 않았으나 입자가 큰 에멀젼은 시간에 따라 입경이 증가하였으며 불안정화 기작은 오스트왈드 라이퍼닝으로 추정되었다.

• 한국세라믹학회지
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• 제47권2호
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• pp.113-116
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• 2010

The silica coated $Fe_3O_4$ nanoparticles have been synthesized using a micro-emulsion method. The $Fe_3O_4$ nanoparticles with the sizes 6 nm in diameter were synthesized by thermal decomposition method. Hydrophobic $Fe_3O_4$ nanoparticles were coated silica using surfactant and tetraethyl orthosilicated (TEOS) as a $SiO_2$ precursor. Shell thickness of silica coated $Fe_3O_4$ can be controlled (11~20 nm) through our synthetic conditions. The $Fe_3O_4$ and silica coated $Fe_3O_4$ nano powders were characterized by transmission electron microscopy (TEM), x-ray diffraction (XRD) and vortex magnetic separation (VMS).

• 한국유가공학회:학술대회논문집
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• 한국유가공기술과학회 2004년도 제59회 추계유가공심포지움 - 유가공 산업의 신기술 동향 및 발전 방향
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• pp.17-29
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• 2004

Nanofood can be simply defined as natural polymer particles containing functional food materials in nanoscale that are synthesized by polymerization or emulisification process. They have very uniform diameters in the range of 1 to 100 nm and extensive surface areas due to the small particle size in spite of their non-porosity. Although the technique to produce nanofood has not Bong developing history, many works have been achieved in various fields. Nanofood has a lot of special advantages, such as functionality, diversity, applicability, etc. In case of the domestic food industries, however, the accumulation of related technique is insufficient against developed countries except used food materials. Also, it is difficult to acquire technical know-how from the developed countries that possess those technologies. We have been studied on preparing functional nanofood and developing new production processes since 1999. Last 5 years we have laid the foundation on the preparation of nanofood and now are focusing on developing new processes of nanofood and expending the field of its applications.