• Proceedings of the Korean Fiber Society Conference
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• 1993.06a
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• pp.53-53
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• 1993

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2000.10a
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• pp.59.1-59
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• 2000

No Abstract.See Full-text

• Bulletin of the Korean Chemical Society
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• v.34 no.11
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• pp.3307-3311
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• 2013

A new fiber optical sensor was developed for the determination of 2,4-dichlorophenol (DCP). The sensor was based on DCP oxidation by oxygen with the catalysis of iron(III) tetrasulfophthalocyanine (Fe(III)PcTs). The optical oxygen sensing film with $Ru(bpy)_3Cl_2$ as the fluorescence indicator was used to determine the consumption of oxygen in solution. A lock-in amplifier was used for detecting the lifetime of the oxygen sensing film by measuring the phase delay change of the sensor head. The different variables affecting the sensor performance were evaluated and optimized. Under the optimal conditions (i.e. pH 6.0, $25^{\circ}C$, Fe(III)PcTs concentration of 0.62 mg/mL), the linear detection range and response time of the sensor are $1.0{\times}10^{-6}-9.0{\times}10^{-6}$ mol/L and 250 s, respectively. The sensor displays high selectivity, good repeatability and stability, and can be used as an effective tool in analyzing DCP concentration in practical samples.

• Proceedings of the Korean Fiber Society Conference
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• 1999.10a
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• pp.33-36
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• 1999

• Proceedings of the Korean Fiber Society Conference
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• 1993.06b
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• pp.655-660
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• 1993

• Proceedings of the Korean Fiber Society Conference
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• 1987.06a
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• pp.31-32
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• 1987

• Proceedings of the Korean Fiber Society Conference
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• 1997.10a
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• pp.97-101
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• 1997

• Proceedings of the Korean Fiber Society Conference
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• 1990.06b
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• pp.51-51
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• 1990

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.268-271
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• 1998

Poly(butylene terephthalate) (이하 PBT)는 두 종류의 결정형태를 가지는 고분자로 널리 알려져 있다. 이 두 가지 결정형태를 각각 $\alpha$상 결정과 $\beta$상 결정이라고 하는데, 이 두 결정형은 방사나 연신 또는 열처리 등의 공정에 의하여 생성되기도 하고 $\alpha$-$\beta$상 간 전이를 일으키기도 한다[1],[2]. (중략)

• Journal of Korea Foundry Society
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• v.14 no.3
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• pp.274-284
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• 1994

SiC fibers were coated with Cu, Ag and Ni metallic thin films by magnetron sputtering in order to improve wetting properties between Al matrix and SiC fiber. The wetting behavior of metal coated SiC fiber by pure Al has been studied at $670^{\circ}C{\sim}900^{\circ}C$ range for $10{\sim}90min$. under vacuum atmosphere. Besides, the effect of coated film thickness on the wettability has been investigated. The wetting behavior and interfacial reaction between Al and SiC fibers were analysed with optical microscope and SEM (scanning electron microscope). The wetting behavior of the as-received SiC fiber with Al melt was not uniform, indicated by the contact angles from less than $90^{\circ} to more Al melt was appeared in the initial stage of reation. It was considered that the metallic thin film played an important role in reducing the interfacial free energy and breaking down the aluminum oxide film by eutectic reaction with Al melt. However the wettability of Ni coated SiC fiber was not improved as much as that of Cu or Ag coated SiC fiber. The improvement of wettability by coating thickness is clearly showed in $1{\mu}m$ coated SiC fiber compared with $0.25{\mu}m$ coated SiC.