• Polymer Science and Technology
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• v.15 no.3
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• pp.274-285
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• 2004

콜로이드 결정 (Colloid crystal)이란 용액 상에서 부유 하는 작은 입자들의 자기 조립 (self-assembly)에 의해 형성된 주기적인 2차원 혹은 3차원 구조를 말한다. 이러한 결정 구조는 광학 필터나 스위치, 광 밴드 갭 재료, 바이오 센서 등의 과학 기술적인 응용을 비롯하여 액화 물질의 상 변화 등과 같은 물리적 현상을 규명함에 있어서 중요한 모델을 제시한다. 특히 최근에 콜로이드의 자기 조립체는 자연적으로 갖게 되는 주기적인 유전율 변화 때문에 빛의 진행 방향이나 특성을 조절할 수 있는 광자 결정 (Photonic Crystal) 구조 제작의 경쟁력 있는 접근 방법으로 각광 받고 있다. (중략)

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2005.11a
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• pp.278-281
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• 2005

This paper present a study of size effect on electrostatic colloid micro thruster. According to results about size effect experiments indicates that the proposed mechanism allows at less than 500 volt of operating voltage for the micro thruster.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.893-894
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• 2009

• 대한핵의학회:학술대회논문집
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• 1970.10a
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• pp.90.3-91
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• 1970

• 대한핵의학회:학술대회논문집
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• 1967.11a
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• pp.104.2-104.2
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• 1967

• 대한핵의학회:학술대회논문집
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• 1967.11a
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• pp.104.3-104.3
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• 1967

• Korean Journal of Materials Research
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• v.12 no.4
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• pp.264-268
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• 2002

Magnetic fluid is a very stable colloid that is attracted by magnetic force as wholly. The magnetic fluids is composed with 10 nm magnetic materials such as magnetite, iron etc., which is dispersed homogeneously in solvent by coating surfactant on their surface. Also this colloid is not separated into magnetic particles and solvent even under magnetic field, centrifugal force, gravity. Due to these properties, the magnetic fluids is used in high vacuum seal, exclusion seal, damper, etc. I would like to introduce the specific properties and applications of the magnetic fluids.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.16 no.2
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• pp.76-81
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• 2006

The leaching behavior of heavy metal ions with pH and colloid/interface property was analyzed by ICP and SEM. The heavy metals in EAF dust are 'amphoteric metal' and the heavy metal ions leached a little at pH 10. And the leaching concentrations of heavy metals at pH 12 were higher than the that at pH 8. The leaching concentrations of heavy metal ion were decreased with adding the clay to the EAF dust. Especially, the leaching concentrations of heavy metal ion were effectively decreased at pH 12. The observation of colloid/interface properties shows that the soluble silicon hydroxide from clay at pH 12 was precipitated at the surface of the heavy metal and clay particles. This silicon hydroxide precipitates were named the PSHP. The leaching concentrations of heavy metal ion were effectively decreased by the formation of PSHP when adding the clay to the EAF dust and controlling the pH of the slurry at 12.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.12 no.1
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• pp.55-61
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• 2006

'Bing' sweet cherries (P. avium L.) were coated with four different coating materials at 1% concentration ($Semperfresh^{(R)}$, calcium caseinate, chitosan, or TIC $Pretested^{(R)}$ colloid 911)and stored at $2.0^{\circ}C$ and 88% RH up to 35 days. The influence of different coating materials on the storability of fresh cherries was investigated. $Semperfresh^{(R)}$ coatings significantly improved overall quality of fresh cherries by decreasing weight loss and improving color stability, and chitosan-based coatings were effective in controlling mold incidence. However, colloid 911 and calcium caseinate coatings did not show significant benefit in preventing quality deterioration of fresh cherry during storage, probably due to their hydrophilic nature leads to exacerbated weight loss and shriveling with the possible interactions between coating materials and cherries epidermal layers.

• The Korean Journal of Nuclear Medicine
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• v.16 no.2
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• pp.49-58
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• 1982

Renal transplant uptake of $^{99m}Tc-tin$ colloid was evaluated in 26 patients. Seventy-seven examinations were performed comparing transplant with bone marrow activity, clinical and/or pathological diagnosis. There were 13 instances of acute rejection; 7 of these exhibited slight uptake of radiocolloid in the renal transplant, 1 had marked uptake, and 5 had no evidence of uptake. There were 7 instances of chronic rejection; 5 of which demonstrated marked transplant uptake of radiocolloid, 1 had slight uptake, and 1 had no evidence of uptake. There were 2 instances of acute tubular necrosis and 55 instances of normal transplant function, but none of these exhibited transplant uptake of radiocolloid. From the result, the uptake of $^{99m}Tc-tin$ colloid by renal transplant appears to signal rejection as long. as the vascular supply is not severely compromised. Acute rejection may be represented by slight radiocolloid uptake, and chronic rejection by marked uptake when compared to bone marrow activity.