• Bulletin of the Korean Chemical Society
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• 제9권5호
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• pp.308-311
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• 1988

The hydrophobic interaction occurring between rhodamine 6G and tetraphenylborate was investigated spectroscopically by varying the medium with the addition of surfactants or ethanol. The ion aggregates formed between the two ions were destroyed by the additives. The dye existed as monomeric species in the presence of a cationic surfactant whereas it was incorporated with anionic and nonionic surfactants. For the complete dissociation more than the critical micelle concentration (cmc) was required with a nonionic surfactant while less than cmc was necessary with the others.

• Bulletin of the Korean Chemical Society
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• 제23권12호
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• pp.1816-1818
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• 2002

• Bulletin of the Korean Chemical Society
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• 제10권4호
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• pp.357-359
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• 1989

The ion aggregates formed between cationic triphenylmethane dyes and tetraphenylborate(TPB) or tetrakis(4-fluorophenyl) borate (TFB) anions have been investigated spectroscopically. The photometric sensitivities of the dyes are found to be increasing in the order pararosaniline < malachite green < methyl violet 2B < crystal violet < ethyl violet. Cetyltrimethylammonium bromide(CTAB) and Triton X-100(TX-100) destroy the ion aggregates. By comparing the concentration of surfactant beyond which dye-borate mixed solutions behave identically with the dye blank, the order of hydrophobicity appears to be parallel with that of photometric sensitivity.

• 한국응용과학기술학회지
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• 제21권3호
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• pp.238-245
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• 2004

The interaction between anion and zwitterionic surfactants was investigated by means of surface tension, NMR spectroscopy, and fluorescence studies. These systems are N-tetradecyloxymethyl-N,N-dimethyl betaine ($C_{14}$, TDB), N-octadecyloxymethyl-N,Ndimethyl betaine ($C_{18}$, ODB), and sodium dodecylethoxy sulfate (SDE). These systems show a composition dependency in micellar properties. When the molar fraction of TDB and ODB was about 0.6, the cmc values of these systems showed minima, whereas the solubilized amount of a water insoluble dye, NMR line width showed maxima. These changes comes from the intramolecular complexes formed in the mixed micelles. The complexes are due to the electrostatic interaction of oppositely charged head groups of betaine and sodium dodecylethoxy sulfate. A comparison of betaine and SDE alkyl methylene group line widths to those of n-methyl group indicates that the interior of the micelle in the restricted region is more immobile than the head group.

• 대한화학회지
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• 제39권3호
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• pp.143-149
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• 1995

낮은 농도에서 유기색소와 계면활성제 계의 흡수거동을 계산하기 위해 간단한 모델을 사용해보았다. 실험에서 얻어진 값에 3개의 파라미터가 포함되어 있는 결과식을 적용함으로써 이온쌍형성$(K_O)$, 회합체에 계면활성제 분자첨가의 경우$(K_S)$, 그리고 색소회합반응$(K_D)$에 대한 평형상수들을 계산하였으며 이값들을 이용하여 자유에너지를 계산하였다. $K_O$와 K_S$의 값들은 소수성에 원인이 있는 정전기적 상호작용에서 기대했던 것들보다 컸었고, $K_D$값들은 정전기적 반발력의 차폐효과로 간주할 수 있는 순수한 수용액에서의 알려진 회합값보다 약 10~20배 정도 높았다.

• Archives of Pharmacal Research
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• 제4권2호
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• pp.75-84
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• 1981

As the cetyltrimenthy ammonium bromide (CTAB) concentration increases to $2{\times}10^{-4}$/M the absorption maximum of ethyl orange (EO) makes a blue shift from 475 mm to 395 mm. At higher concentration of CTAB than $2{\times}10^{-4}$ / M the absorption maximum shifts to higher wavelength than 395 nm. A new peak at 395 nm is shown to result from the mixed micelle due to dye stacking interaction rather than from a change in dye geometry. Because Raman spectra of EO on interaction with varying amount of CTAB are similar to that of EO in water. EO retains trans azo type on interaction with CTAB. There is a change of c.m.c.s. of CTAB for the mixed micelle in the presence of salt. The effect of added salt on C. M. C. of CTAB for the mixed micelle is given that the logarithm of the c. m. c. is a linear function of the logarithm of the sum of the c. m. c. and the concentration of added salt.

• 공업화학
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• 제5권5호
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• pp.779-785
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• 1994

양이온 색소인 thionin(Th)과 음이온 계면활성제인 sodium dodecyl sulfate(SDS) 사이의 상호작용을 흡수 spectra로 고찰하였다. 임계미셀농도(critical micelle concentration, CMC)보다 훨씬 낮은 premicellar 영역(S/D=10, 80 및 160)에서 온도가 증가함에 따라 몰 흡광계수비가 증가하거나 감소함을 볼 수 있으며, S/D=160에서 Th-SDS계의 다분자 회합체가 생성하는 가장 안정한 온도 범위는 $60^{\circ}C$ 이하임을 알 수 있었다. 한편 Th-SDS계에 첨가한 무기염 및 유기용매의 농도가 증가함에 따라 ${\gamma}$-band와 J-band는 감소하나 ${\alpha}$-band는 오히려 증가하는 경향이 나타났다. 이들의 ${\alpha}$-band의 증가 순서는 무기염의 경우 $Cl^-$>$ClO{_4}{^-}$>$SO{_4}{^{2-}}$>$NO{_3}{^-}$로 나타나며, 유기용매인 경우는 2-propanol>ethanol>methanol>ethylene glycol로 나타남을 알 수 있다.