Microstructural changes during the decomposition of YBa2Cu4O8 superconductors

Park, Y. K.; Lee, K. W.; Hur, Nam Hwi; Oh, Won-Jae; Ha, Dong-Woo; Park, K.; Park, J. C.

doi:10.1007/bf00735690

Cited by 18 publications

(24 citation statements)

References 9 publications

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“…Among the various methods, chemical treatment is known to be a very efficient method for improving the interfacial adhesion of organic fiber-reinforced composites (7)(8)(9). And many researches have reported that this improved interfacial adhesion can increase several mechanical properties of the composites (10,11).…”

Section: Introductionmentioning

confidence: 99%

Effect of Chemical Treatment of Kevlar Fibers on Mechanical Interfacial Properties of Composites

Park

Seo

et al. 2002

Journal of Colloid and Interface Science

179

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Section: Introductionmentioning

confidence: 99%

Effect of Chemical Treatment of Kevlar Fibers on Mechanical Interfacial Properties of Composites

Park

Seo

et al. 2002

Journal of Colloid and Interface Science

179

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“…27 The γS L values are usually assumed to be fairly independent of the method of surface modification of the carbon materials. 28 It is assumed that the specific component (γS SP ) reflects the essential surface characteristics of carbon or the partial graphitized carbon framework of the particles. In contrast, we observe a distinct dependence of the values of the fluorine content on the CB surfaces.…”

Section: Resultsmentioning

confidence: 99%

Effect of Fluorination on Electrical Behaviors of Carbon Blacks-filled HDPE Polymeric Switch

Seo¹,

Park

2009

Bulletin of the Korean Chemical Society

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Electrical properties of a fluorinated carbon black (CB)-filled high-density polyethylene (HDPE) polymeric switch were investigated as a function of fluorination pressure at 0.1 ~ 0.4 MPa. From the FT-IR results, the absorption spectra of the fluorinated CB show an absorption band at 1400 ~ 1000 cm -1 for νC-F and the peak intensity increased with increasing fluorination pressure. Also, the analysis of XPS spectra of the fluorinated CB indicated that fluorine content increased with increasing fluorination pressure. Meanwhile, the surface free energy of the fluorinated CB decreased with increasing fluorination pressure. Consequently, the increase of fluorine contents of CB made a disappearance of negative temperature coefficient (NTC) behavior of the polymeric switch, which was probably due to the reduction of CB reaggregation after melting point of the HDPE, resulted from the decreasing of London dispersive component of the surface free energy for CB particles.

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“…On the other hand, the conventional chemical modification approaches [21][22][23][24][25][26][27] mainly contain: (1) Etching on the fiber surface via the nitration reaction or the sulfonation reaction on Phenyl ring; and (2) introducing the active functional groups into the fiber surface molecule structure via the graft reaction in the active hydrogen atoms of Imide groups. But it is very hard for the former to control the surface treatment depth and degree, and then it is inevitable to decrease the fiber intrinsic strength because of the corrosive and destructive effects of the strong oxidative acids on the fiber surface.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of Aramid fibers with new chemical method for improving interfacial bonding strength with epoxy resin

Liu

Zheng

2010

J of Applied Polymer Sci

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Friedel-Crafts reaction was elected as the specific chemical approach to modify Aramid fiber surface in this article. After the surface treatment, the interfacial shear strength value of Aramid fiber/Epoxy composites was enhanced by about 50%. The surface elements of Aramid fibers were determined by X-ray photoelectron spectroscopy, whose results showed that the ratio of Oxygen/ Carbon was increased. The crystalline state of Aramid fibers was determined by X-ray diffraction instrument, and the surface morphological of Aramid fibers was analyzed by Scanning electron microscope. The results indicated that this novel surface treatment approach, which is a suitable way of the batch-process for Industrialization, not only can improve the interfacial bonding strength of Aramid fibers reinforced Epoxy resin matrix composites remarkably, but also hardly has any negative influence on the intrinsic tensile strength of Aramid fibers. The wettability degree of the fiber surface was enhanced by this new approach too.

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Microstructural changes during the decomposition of YBa2Cu4O8 superconductors

Cited by 18 publications

References 9 publications

Effect of Chemical Treatment of Kevlar Fibers on Mechanical Interfacial Properties of Composites

Effect of Chemical Treatment of Kevlar Fibers on Mechanical Interfacial Properties of Composites

Effect of Fluorination on Electrical Behaviors of Carbon Blacks-filled HDPE Polymeric Switch

Surface modification of Aramid fibers with new chemical method for improving interfacial bonding strength with epoxy resin

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