• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.280-280
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• 2006

Na-bentonite (local clay mineral) and Na-montmorillonite were treated with quaternary alkylammonium cations. The effect of the molecular structure and functional groups of the surfactants on the organoclays was investigated by X-ray diffraction (XRD). For the preparation of nanocomposites, organoclays were melt-blended with polypropylene in a twin screw extruder and $Surlyn^{(R)$. ionomer was used as a reactive compatibilizer. The clay dispersions in the composites were investigated by X-ray diffraction (XRD). XRD spectra showed no peak at low angle indicated that the silicate clay layer has a nearly exfoliated dispersion in the polymer matrix. Thermal and mechanical properties of nanocomposites were higher than those of PP.

• Asian-Australasian Journal of Animal Sciences
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• 제28권2호
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• pp.290-302
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• 2015

Growing demand for sustainable production, increasing competition and consideration of health concerns have led the meat industries on a path to innovation. Meat industries across the world are focusing on the development of novel meat products and processes to meet consumer demand. Hence, a process innovation, like nanotechnology, can have a significant impact on the meat processing industry through the development of not only novel functional meat products, but also novel packaging for the products. The potential benefits of utilizing nanomaterials in food are improved bioavailability, antimicrobial effects, enhanced sensory acceptance and targeted delivery of bioactive compounds. However, challenges exist in the application of nanomaterials due to knowledge gaps in the production of ingredients such as nanopowders, stability of delivery systems in meat products and health risks caused by the same properties which also offer the benefits. For the success of nanotechnology in meat products, challenges in public acceptance, economics and the regulation of food processed with nanomaterials which may have the potential to persist, accumulate and lead to toxicity need to be addressed. So far, the most promising area for nanotechnology application seems to be in meat packaging, but the long term effects on human health and environment due to migration of the nanomaterials from the packaging needs to be studied further. The future of nanotechnology in meat products depends on the roles played by governments, regulatory agencies and manufacturers in addressing the challenges related to the application of nanomaterials in food.

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.309-309
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• 2006

Latest developments on hybrid nanostructured materials fabricated by applying self-assembly strategies on organic/inorganic nanotemplates are discussed. Within this frame, numerous functional nanomaterials including arrays of composite metal/semiconductor nanoparticles, planar waveguides and functional multilayer thin films are generated using self-assembled polymers as templates or building blocks. In particular, surface plasmon resonance based optical sensing is employed to investigate nanofabrication processes occurring in nanoscale dimention. We also suggest unprecedented pathways to hybrid supramolecular multilayer nanoarchitectures in 1D or 2D geometry via layer-by-layer self-assembly.

• 한국고분자학회지:고분자과학과기술
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• 제17권3호
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• pp.303-311
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• 2006

• 멤브레인
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• 제33권6호
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• pp.315-324
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• 2023

이온교환막은 전기막 공정의 성능을 결정하는 핵심 구성 요소이다. 본 총설에서는 다양한 전기막 공정에 적용되는 이온교환막의 성능을 탄소계 및 금속계 나노물질을 이용한 개질을 통해 향상시킨 최신 연구 동향을 살펴보았다. 나노물질들은 다양한 방법을 통해 이온교환막에 도입될 수 있다. 특히 탄소계 나노물질은 화학적 개질을 통해 추가적인 기능기를 도입함으로써 고분자 사슬과의 상호작용을 강화할 수 있다. 이를 통해 이온교환막의 이온전도도를 개선시킬 수 있을 뿐만 아니라 적층 구조를 통한 체거름 현상으로 이온 선택 투과성을 향상시킬 수 있다. 한편, 금속계 나노물질은 적층 구조 혹은 다공성 구조를 갖는 특성을 이용하여 이온교환막 내에서 목적 이온과 배제 이온 간의 수화 반경 차이를 이용한 체거름 특성을 통해 이온 선택 투과성을 향상시킬 수 있다. 또한, 사용한 바인더의 특성에 따라서는 나노물질-바인더 간의 상호작용을 통해 이온전도도도 향상시킬 수 있다. 본 총설로부터 탄소계 및 금속계 나노물질을 이용하여 이온교환막의 특성을 효과적으로 조절할 수 있으며, 따라서 이에 관한 연구가 전기막 공정의 성능을 크게 향상시키기 위해 중요함을 확인할 수 있다.

• Bulletin of the Korean Chemical Society
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• 제29권2호
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• pp.413-416
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• 2008

A synthesis route to ordered mesoporous carbons with controllable nitrogen content has been developed for high-performance EDLC electrodes. Nitrogen-doped ordered mesoporous carbons (denoted as NMC) were prepared by carbonizing a mixture of two different carbon sources within the mesoporous silica designated by KIT-6. Furfuryl alcohol was used as a primary carbon precursor, and melamine as a nitrogen dopant. This synthesis procedure gave cubic Ia3d mesoporous carbons containing nitrogen as much as 13%. The carbon exhibited a narrow pore size distribution centered at 3-4 nm with large pore volume (0.6-1 cm3 g-1) and high specific BET surface area (700-1000 m2 g-1). Electrochemical behaviors of the NMC samples with various N-contents were investigated by a two-electrode measurement system at aqueous solutions. At low current density, the NMC exhibited markedly increasing capacitance due to the increase in the nitrogen content. This result could be attributed to the enhanced surface affinity between carbon electrode and electrolyte ions due to the hydrophilic nitrogen functional groups. At high current density conditions, the NMC samples exhibited decreasing specific capacitance against the increase in the nitrogen content. The loss of the capacitance with the N-content may be explained by high electric resistance which causes a significant IR drop at high current densities. The present results indicate that the optimal nitrogen content is required for achieving high power and high energy density simultaneously.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2007년도 학술발표회 논문집
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• pp.493-494
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• 2007

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• Macromolecular Research
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• 제16권4호
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• pp.267-292
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• 2008

Block copolymers that two or more polymer chains are covalently linked have drawn much attention due to self-assembly into nanometer-sized morphology such as lamellae, cylinders, spheres, and gyroids. In this article, we first summarize the phase behavior of block copolymers in bulk and thin films and some applications for new functional nanomaterials. Then, future perspectives on block copolymers are described.

• Toxicological Research
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• 제21권4호
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• pp.303-307
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• 2005

Nanomaterials, which ranges in size from 1 to 100 nm, have been used to create uqnique devices at the nanoscale level possessing novel physical and chemical functional properties. However, the toxicities of nanomaterials have not been fully tested and the risk of nanomaterials is emerging issues in these days. In this study, the cytotoxicity of copper nanoparticles was tested in cultured human bronchial epithelial cells. As a results, copper nanoparticles showed cytotoxicity similar with cupric ion and the apoptotic mechanisms of DNA fragmentation and caspase-3 activation were involved. Induction of heme oxygenase-1 and thioredoxin reductase by copper nanoparticles indicated that cytotoxicity of copper nanoparticles is likely to be mediated through oxidative stress.

• 한국고분자학회지:고분자과학과기술
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• 제21권3호
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• pp.241-246
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• 2010