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Hong, Cheon Taek,Lee, Woohwa,Kang, Young Hun,Yoo, Youngjae,Ryu, Juwhan,Cho, Song Yun,Jang, Kwang-Suk The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.23
<▼1><P>Single-walled carbon nanotube (SWCNT)/poly(3-hexylthiophene) (P3HT) hybrid films doped by spin-coating exhibited power factors up to 308 µW m<SUP>−1</SUP> K<SUP>−2</SUP>.</P></▼1><▼2><P>This study investigates a coating method for doping a single-walled carbon nanotube (SWCNT)/poly(3-hexylthiophene) (P3HT) hybrid film. In the hybrid film, P3HT chains were very highly doped by simple spin-coating of a FeCl3/nitromethane solution. Hybrid films doped by spin-coating exhibited power factors of 267 ± 38 µW m<SUP>−1</SUP> K<SUP>−2</SUP>, which is an improvement over that of hybrid films doped by conventional immersion, 103 ± 24 µW m<SUP>−1</SUP> K<SUP>−2</SUP>. The excellent thermoelectric performance is originated from the dramatically increased electrical conductivity by the sufficient doping of P3HT in the hybrid films.</P></▼2>
Hong, Tae Eun,Jung, Jae-Hun,Yeo, Seungmin,Cheon, Taehoon,Bae, So Ik,Kim, Soo-Hyun,Yeo, So Jeong,Kim, Hyo-Suk,Chung, Taek-Mo,Park, Bo Keun,Kim, Chang Gyoun,Lee, Do-Joong American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.3
<P>Ternary and amorphous tungsten silicon nitride (W-Si-N) thin films were grown by atomic layer deposition (ALD) using a sequential supply of a new fluorine-free, silylamide-based W metallorganic precursor, bis(tert-butylimido)bis(bis(trimethylsilylamido))tungsten(VI) [W(NtBu)(2){N(SiMe3)(2)}(2)], and H-2 plasma at a substrate temperature of 300 degrees C. Here, W(NtBu)(2){N(SiMe3)(2)}(2) was prepared through a metathesis reaction of W(NtBu)(2)Cl-2(py)(2) (py = pyridine) with 2 equiv of LiN(SiMe3)2 [Li(btsa)]. The newly proposed ALD system exhibited typical ALD characteristics, such as self-limited film growth and linear dependency of the film growth on the number of ALD cycles, and showed a high growth rate of 0.072 nm/cycle on a thermally grown SiO2 substrate with a nearly zero incubation cycle. Such ideal ALD growth characteristics enabled excellent step coverage of ALD-grown W-Si-N film, similar to 100%, onto nanotrenches with a width of 25 nm and an aspect ratio similar to 4.5. Rutherford backscattering spectrometry and X-ray photoelectron spectroscopy analysis confirmed that the incorporated Si and W were mostly bonded to N, as in Si-N and W-N chemical bonds. The film kept its amorphous nature until annealing at 800 degrees C, and crystallization happened at local areas after annealing at a very high temperature of 900 degrees C. An ultrathin (only similar to 4 nm thick) ALD-grown W-Si-N film effectively prevented diffusion of Cu into Si after annealing at a temperature up to 600 degrees C.</P>
손홍하 ( Hong-ha Son ),곽택종 ( Taek-jong Kwak ),김경섭 ( Kyung-seob Kim ),이상민 ( Sang-min Lee ),이천구 ( Cheon-koo Lee ) 대한화장품학회 2006 대한화장품학회지 Vol.32 No.1
화장품에서 색조 화장품 분야에서 분체의 함유율이 높은 투웨이케익, 팩트, 페이스파우더와 같은 파우더류 제품은 함유되는 분체의 물성이 품질에 큰 영향 인자로 작용하기 때문에 분체의 복합화, 금속비누 처리, 아미노산처리, 실리콘처리, 불소 처리등을 통한 품질 향상을 목적으로 표면처리가 시도되어 왔다. 위와 같은 파우더류 제품중에 투웨이케익은 커버력이 가장 요구되는 제품으로서 부착성이나 퍼짐성과 같은 부가품질의 동시 구현이 다른 파우더류 제품보다 어려우며, 화장을 두껍게 느끼거나 답답하다는 사용자들의 잠재불만도 존재하는 제품군이다. 본 연구는 투웨이케익 제품의 중요품질인 부착성과 퍼짐성을 향상시키고, 친화성을 충분히 고려한 새로운 표면처리 방법으로서 피부성분과 구조를 모사하여, 스킨케어에 주로 사용하는 성분들로 나노베시클을 제조하여 그 구조를 파괴하지 않은 상태로 표면 처리하는 방법에 대한 것이다. 분체를 제조하기 위해 먼저, 레시친, 세라마이드, 초산토코페롤, 부틸렌글리롤을 사용하여 고압·유화로 나노유화물을 제조하였고, 이것을 수상에 분산된 체질안료 분산액에 투입, 2가 금속염 용액을 투입한 후, 여과, 건조과정을 통해 나노베시클이 피복된 새로운 기능의 분체를 얻었다. 피복되는 공정에서는 금속염의 농도에 따라 피복량이 결정됨을 확인하였고, 피복된 파우더의 물성에서는 현재 주로 사용하는 실리콘 처리체질안료에 비해 본 연구를 통해 제조된 파우더의 마찰계수가 낮았으며, 외력에 의한 부착성 평가에서도 파우더의 이탈량이 적은 결과를 나타내었다. 또한 이를 함유한 투웨이케익과 함유하지 않은 투웨이케익의 평가에서도 같은 경향의 결과를 나타내었다. In the field of makeup cosmetics, especially, powder-based foundations such as two-way cake, pact and face powder, the quality of which is known to be strongly influenced by the properties of powder, surface treatment technology is widely used as a method to improve the various characteristics of powder texture, wear properties, dispersion ability and so on. The two-way cake or pressed-powder foundation is one of the familiar makeup products in Asian market for deep covering and finishing purpose. In spite of the relent progress in surface modification method such as composition of powders with different characteristics and application of a diversity of coating ingredient (metal soap, amino acid, silicone and fluorine), this product possess a technical difficulty to enhance both of the adhesion power and spreadability on the skin in addition to potential claim of consumer about heavy or thick feeling. This article is covering the preparation and coating method of nano-vesicle that mimic the double-layered lipid lamellar structure existing between the corneocytes of the stratum corneum in the skin for the purpose of improving both of two important physical characteristic of two-way cake, spreadability and adhering force to skin, and obtining better affinity to skin. Nano-vesicle was prepared using the high-pressure emulsifying process of lecithin, pseudo ceramide, butylene glycol and tocopheryl acetate. This nano-sized emulsion was added to powder-dispersed aqueous phase together with bivalent metal salt solution and then the filtering and drying procedure was followed to yield the nano-vesicle coated powder. The amount of nano-vesicle coated on the powder was able to regulated by the concentration of metal salt and this novel powder showed the lower friction coefficient, more uniform condition of application and higher adhesive powder comparing with the alkyl silane treated powder from the test result of spreadability and wear properties using friction meter and air jet method. Two-wav cake containing newly developed coated powder with nano-vesicle showed the similar advantages in the frictional and adhesive characteristics.
미국 태권도 저단자 수련지속 및 예비사범 교육과정 개발 및 운영
손천택 ( Son Cheon-taek ),장용규 ( Jang Yong-kyu ),박상봉 ( Park Sang-bong ),임태희 ( Lim Tae-hee ),김홍식 ( Kim Hong-sik ) 국기원 2016 국기원태권도연구 Vol.7 No.4
이 연구는 해외 태권도를 견인하고 있는 미국 태권도 도장에서 수련중인 태권도 저단자와 그들을 가르치고 있는 현지 사범들의 교육적 요구와 기대를 파악하여 태권도 저단자의 계속적인 태권도 수련을 유도하고 예비 태권도 지도자로서 자질 향상에 도움이 되는 `저단자 수련지속 및 예비사범 교육과정`을 개발하고, 그것의 효율적인 운영 방법을 제안하는데 있었다. 연구목적을 달성하기 위하여 기본적인 문헌고찰이나 문서 분석 및 미국 태권도 교육 현장의 실제를 파악하기 위해 설문조사, 심층면담, 초점집단 면담, 참여관찰 등을 사용하여 필요한 자료를 수집하였다. 수집한 자료를 분석하고 전문가 의견을 청취하여 품새, 겨루기, 격파, 호신술, 인성, 이론 등 6개의 대영역, 21개의 중 영역, 47개의 소 영역 과목으로 이루어진 태권도 특별 교육과정을 개발하였다. 개발된 특별 교육과정의 효율적인 운영방법은 국기원이 현지 사범을 강사로 교육하여 현지 사범 중심으로 지도가 이루어지도록 하는 것이며, 수업 모듈을 개발하여 공급하는 것도 좋은 대안이 될 수 있는 것으로 파악되었다. The purpose of this study was to examine the educational needs and expectations of on-site Masters and low-dan holders who are training in Taekwondo academies in the United States, a leader in overseas Taekwondo, in order to encourage low-dan holders to continue their training, to develop a “continuing training for low-dan holders and education programs for pre-Masters” and to propose methods to effectively operate such programs. To achieve this research purpose, methods such as a basic literature review and document analyses, as well as surveys, in-depth interviews, focus group interviews, and participant observations were utilized in order to gather the required data. The data was analyzed and, with further expert advice, a special Taekwondo training program was developed, constituting of the six major domains of Poom-sae, Gyeorugi, Gyeokpa, Self-defense, Character, and Theory, 21 medium domains, and 47 minor domains. This research concluded that this program can be effectively operated when Kukkiwon educates local Masters as instructors and ensures that instruction is provided by local Masters; the provision of class modules can also be an effective alternative.
Enhanced Thermoelectric Performance of Bar-Coated SWCNT/P3HT Thin Films
Lee, Woohwa,Hong, Cheon Taek,Kwon, O Hwan,Yoo, Youngjae,Kang, Young Hun,Lee, Jun Young,Cho, Song Yun,Jang, Kwang-Suk American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.12
<P>The influence of processing conditions, such as ink concentration and coating method, on the thermoelectric properties of SWCNT/P3HT nanocomposite films was investigated systematically. Using simple wire-bar-coating, SWCNT/P3HT nanocomposite films with high thermoelectric performance could be obtained without additional P3HT doping. The wire-bar-coated SWCNT/P3HT nanocomposite films exhibited power factors of up to 105 μW m<SUP>–1</SUP> K<SUP>–2</SUP> at room temperature. The SWCNT bundles with diameters in the range of 6–23 nm formed an interconnected network in the wire-bar-coated nanocomposite films. Network formation in these nanocomposite films was expected to be strongly related to the development of electrical pathways due to inter-SWCNT bundle connections. This study suggests that the thermoelectric performance of SWCNT/P3HT nanocomposite films could be optimized by controlling their processing conditions and morphology.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-12/acsami.5b00626/production/images/medium/am-2015-00626r_0011.gif'></P>