• Title/Summary/Keyword: Organic and inorganic fibers

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Physical Properties of Organic- and Inorganic-Fiber Reinforced Portlandcement (유기 및 무기 섬유로 보강한 포트랜드 시멘트의 물성 연구)

  • Chang Pok-Kie;Kim Yun Ju
    • Journal of the Korean Ceramic Society
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    • v.41 no.9
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    • pp.690-695
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    • 2004
  • In this study, inorganic (steel, asbestos and carbon) and organic (polyacryl and polyamide) fibers were used to investigate their reinforcing effects of the physical properties of Portland cement. From the load-displacement curve of each reinforced specimen, fracture strength, Young's module, fracture energy and fracture toughness were computed and compared with each other. In addition, the experiment of their impact toughness was carried out and compared with the fracture energy. For the improvement of fracture strength the inorganic (asbestos) fiber reinforcement was most effective, while the best reinforcing effect of impact toughness was achieved by organic (polyacryl) fiber. And steel fiber proved to be most adequate for improvement of both fracture strength and impact toughness. Steel fiber also showed the highest fracture energy and fracture toughness among all of the fibers.

Titanium Dioxide Nanofibers Prepared by Using Electrospinning Method

  • Ding, Bin;Kim, Chul Ki;Kim, Hak Yong;Seo, Min Kang;Park, Soo Jin
    • Fibers and Polymers
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    • v.5 no.2
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    • pp.105-109
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    • 2004
  • The synthesis of titanium dioxide nanofibers with 200-300nm diameter was presented. The new inorganic-organic hybrid nanofibers were prepared by sol-gel processing and electrospinning technique using a viscous solution of titanium isopropoxide (TiP)/poly(vinyl acetate) (PVAc). Pure titanium dioxide nanofibers were obtained by high temperature calcination of the inorganic-organic composite fibers. SEM, FT-IR, and WAXD techniques were employed to characterize these nanofibers. The titanium dioxide nanostructured fibers have rougher surface and smaller diameter compare with PVAc/TiP composite nanofibers. The anatase to rutile phase transformation occurred when the calcination temperature was increased from $600^{\circ}C$ to $1000^{\circ}C$.

Rheology Performance of fiber-Reinforced Mortar with Length Combination of Organic and Inorganic Fiber (유·무기 섬유 길이조합변화에 따른 섬유보강 모르타르의 레올로지 특성)

  • Kang, Byeog-Hoe;Park, Yong-Jun;Jo, Man-Ki;Lee, Gun-Cheol;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.130-131
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    • 2014
  • In this study, Analyse about flowability for fiber-reinforud mortar has been focused. Organic and inorganic fibers with different length have been combinatiorly used. The results showed using combination length of the fibers decrease the flowability, comparing with plain, fracture styess has been increased, Results also showed when several kinds of fibers used together showed the highest fracture stress.

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Analysis of the Flowability for Organic·Inorganic Fiber with the Variation of Length (유·무기 섬유 길이조합변화에 따른 섬유 보강 모르타르의 유동성 분석)

  • Park, Yong-Jun;Kang, Byung-Hoi;Lee, Hong-Kyu;Jo, Man-Ki;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2014.05a
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    • pp.128-129
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    • 2014
  • In this study, flowability of the mortar added with length change and combination of steel and inorganic fiber has been tested to evaluate the performance of fiber-reinforced mortar. The following results could be made as the conclusion. Early age flow of the mortar has been decreased when fibers added. Slump also decreased with the adding of fibers. For the air content, comparing with Plain, all the specimens with fibers showed higher air content than Plain., Addition of every kinds fibers showed the similar EIS test results.

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A Study on the Degradation of Isopropyl Alcohol with $TiO_2-Coated$ Plastic Optic Fibers (광촉매 코팅 광섬유의 IPA 분해 특성 연구)

  • Yu Dong-Sik;Joo Hyun-Ku;Ha Jin-Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.6 no.4
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    • pp.337-341
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    • 2005
  • The degradation of IPA according to coating conditions was examined by $TiO_2/P-25-coated$ POF. In the photoactivity of $TiO_2-coated$ POF, ethanol solvent was higher activity than other solvents. Inorganic(KR-400), organic(A-9540) and inorganic$\cdot$organic hybrid(GPTMS, TMOS) resins were used as binder. Organic binder(A-9540) showed the highest activity for degradation of IPA, but organic binder was decomposed by $TiO_2$. Inorganic binder had lower binder ability than others, and lower adhesive than organic binders. In TMOS as inorganic · organic hybrid binder, activity of IPA degradation was decreased by addition of TMOS when the ratio of TMOS and P-25 was changed from 0.05 to 1.

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Changing Fundamental Properties of HPFRCC Depending on Combination and Content of Organic and Inorganic Fibers (유·무기섬유 혼입비 및 혼입율 변화에 따른 HPFRCC의 기초물성 변화)

  • Lee, Jea-Hyeon;Moon, Byeong-Yong;Park, Yong-Jun;Jo, Sung-Jun;Kim, Jong;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.05a
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    • pp.28-29
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    • 2016
  • Recently, the attention on high tensile, and high performance cementitious composite (HPFRCC) which can minimize the damage from explosion of inflammable gas and chemicals has been increased. In spite of outstanding tensile performance, HPFRCC has the drawbacks of fiber ball, undesirable cost, and high autogenous shrinkage. therefore, in this research, to develop the optimum HPFRCC, the fundamental properties and autogenous shrinkage of HPFRCC was analyzed depending on various combination and content of organic and inorganic fibers.

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Production of Functional Colloids and Fibers from Phase Separation During Electrohydrodynamic Process

  • Jeong, Un-Ryong
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2011.10a
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    • pp.1.2-1.2
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    • 2011
  • Electrohydrodynamics is a good approach to produce uniform-sized colloids and fibers in a continuous process. The dimension can be controlled from tens of nanometers to a few micrometers. The structure of the colloids and nanofibers from electrohydrodynamics has been diversified according to the uses. Especially, core-shell structure and hybridization with functional nanomaterials are fascinating due to their possible uses in drug-delivery systems, multifunctional scaffolds, organic/inorganic hybrids with new functions, and highly sensitive gas- or bio-sensors. This talk will present the structural variations in the colloids and fibers by simply employing phase separation during electrohydrodynamic process and demonstrate their possible applications.

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Development of a flexible solar cell fiber by using an organic-inorganic hybrid materials (${\codt}$ 무기 하이브리드 재료를 이용한 플렉서블 태양전지 섬유의 개발)

  • Song, Jun-Hyung;Kim, Joo-Yong;Park, Jung-Hyun;Kim, Gu-Young;Kim, Young-Kwan
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.299-301
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    • 2007
  • An organic-inorganic hybrid solar cell fibers with characteristics such as formability, low-cost and tailorability was developed by deposition of C60 and CuPc on fiber surface. In spite of some variation according to the temperature of ITO deposition, the maximum open circuit voltage of 0.39V was attained at $150^{\circ}C$(1000end). The resulting solar cell showed the performances Isc=0.482, Voc=0.320, FF=0.285 ${\eta}_{e}=0.044$% which are comparable to one of other types of solar cells in literature.

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Binding of Zeolites to Inorganic Fiber using Covalent Linkers (공유결합을 이용한 무기질 섬유와 제올라이트의 결합)

  • Song, Kyeong-Keun;Yoo, Yoon-Jong;Kim, Hong-Soo;Ha, Kwang
    • Korean Chemical Engineering Research
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    • v.44 no.3
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    • pp.254-258
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    • 2006
  • Zeolites with excellent adsorption capacity of volatile organic compounds were attached onto inorganic fibers which were the raw materials of honeycomb-type adsorbers. The amounts of zeolite particles attached onto the fibers considerably increased by treating them with hydrochloric acid, sulfuric acid, or hydrofluoric acid. Various functional groups such as chloropropyl, aminopropyl and epoxy groups of silane compounds, and amine groups of polyethylenimine were employed as covalent linkage materials between the fibers and zeolite particles. The state of the fibers coated with zeolite particles was examined by scanning electron microscopy, and the amounts of zeolite particles bound to the fibers were estimated from their BET surface areas. The largest amount was obtained when polyethylenimine was employed as a linkage material. Polyethylenimine was the most effective for attaching zeolite particles onto the inorganic fibers among various linkers employed.

Consideration of Analysis Method of Asbestos and Existing Condition for Fibrous Materials in Domestic Air (국내 공기 중 섬유상 물질의 존재실태와 석면의 분석방법에 대한 고찰)

  • Hwang, Jinyeon;Oh, Jiho;Lee, Hyomin;Lee, Jinhyun;Son, Byeongseo
    • Journal of the Mineralogical Society of Korea
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    • v.28 no.2
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    • pp.165-171
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    • 2015
  • Dust samples collected from air in metropolitan areas of Busan and Ulsan were analyzed by phase contrast microscopy, phase contrast dispersion microscopy and SEM. Asbestos concentration in dust samples was lower than detection limit. Many fibrous materials were observed in dust samples, but most of them were organic fibers. Inorganic fibers such as rock fiber, ceramic fiber and gypsum were contained in the samples and non-fibrous minerals such as quartz, calcite and feldspar were also occasionally observed. Domestic law requires that asbestos in air dust is mainly analyzed by phase contrast microscopy. From this study, however, precise analysis of asbestos was almost impossible by this method only. As indicated in JIS method of Japan, therefore, count and identification of asbestos were more efficient by dispersion staining method after removing organic materials in samples by low temperature incinerator.