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전기전도성 폴리피롤의 In-Situ 라만 분광학방법에 의한 연구
김홍두 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-
In-situ Raman spectra of polypyrrole were studied as a function of the applied Potentials using copper phthalocyanine tetrasulphate(CuPcTs) and dodecylsulfate(DS) ions as dopants. The 1552 cm^(-1) Raman shift of symmetric C=C stretching band has been changed towards long wavenumber as the polypyrrole film oxidized. The significant resonance Raman effects have been shown when the polypyrrole was reduced below -0.6V and may be due to the complex formation of the partially reduced polypyrrole with CuPcTs and DS ions.
Poly (N-ethyl-2-vinyl-pyridinium) bromide의 탈염수 용액에서의 자기확산
김홍두 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-
The self-diffusion coefficient (D_(s)) of poly[(N-ethyl-2-vinyl-pyridinium) bromide] (P2VP-EtBr) was measured in salt-free aqueous solution with forced Rayleigh scattering technique. At each molecular weight solutions up to 5wt% of P2VP-EtBr showed very little change in D_(s). Above 10wt%, D_(s) for P2VP-EtBr showed stronger concentration dependence than that of neutral polymer. What is most striking about our results is near molecular weight independence of D_(s) in high molecular weight regime. Qualitatively, our results were interpreted using the local ordering of the chain segment by long range coulombic interaction.
김홍두 ( Hung Doo Kim ) 대한임상검사과학회 1988 대한임상검사과학회지(KJCLS) Vol.20 No.1
The term photometric mesurement was originally defined as measurement of light intensity of multiple wavelengths, while spectrophotometric measurements formerly meant mesurement of light intenisty in a much narrower wavelength range. It has recently become common usage to refer to instruments that use filters for isolation of part of the spectrum as photometers or colorimeters, whereas instruments that use gratings and or prisms are called spectrophotometers. The range of light measured is no longer a valid distinction between colorimeters and spectrophotometers. Electromagnetic radiation includes radiant energy from short wavelength gamma rays to wavelength radio waves. Frequently, a white light source for the visible region or a deuterium source for ultraviolet light wil provide the wavelengths used. The wavelength of light is defined as the distance between peaks as the light is envisioned to travel in a wavelike manner.