• Title/Summary/Keyword: TTAB

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Relationship between the Micellization of TTAB and the Solubilization of p-Bromophenol in TTAB Solution (TTAB 용액에서 p-브로모페놀의 가용화와 TTAB의 미셀화와의 상관관계에 대한 연구)

  • Lee, Byung-Hwan
    • Journal of the Korean Chemical Society
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    • v.57 no.6
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    • pp.665-671
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    • 2013
  • The solubilization of p-bromophenol by the micellar system of TTAB(tetradecyltrimethylammonium bromide) and the micellization of TTAB were studied by the UV-vis spectrophotometric method simultaneously. And the effects of temperature on these properties have been measured for the thermodynamic study. The results show that the ${\Delta}G_s{^o}$ and ${\Delta}H_s{^o}$ values are negative and the ${\Delta}S_s{^o}$ values are positive for the solubilization of p-bromophenol within the measured range. On the other hand, the ${\Delta}G_m{^o}$ values are negative and the ${\Delta}H_m{^o}$ and ${\Delta}S_m{^o}$ values are positive for the micellization of TTAB. The effects of additives such as n-butanol and NaCl have been studied also for both properties and the relationship between these two properties has been also studied. From the results, we can postulate the solubilization site of p-bromophenol in the micelle.

Study on the Micellization of TTAB/Brij 35 Mixed Systems in Aqueous Solutions of n-Butanol (n-부탄올 수용액에서 TTAB/Brij 35 혼합계면활성제의 미셀화에 대한 연구)

  • Gil, Han-Nae;Lee, Byung-Hwan
    • Applied Chemistry for Engineering
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    • v.18 no.3
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    • pp.267-272
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    • 2007
  • The critical micelle concentration (CMC) and the counterion binding constant (B) in a mixed micellar state of the trimethyltetradecylammonium bromide (TTAB) with the polyoxyethylene (23) lauryl ether (Brij 35) at $25^{\circ}C$ in water and in aqueous solutions of n-butanol (0.1 M, 0.2 M, and 0.3 M) were determined as a function of ${\alpha}_1$ (the overall mole fraction of TTAB) by the use of electric conductivity method and surface tensiometer method. Various thermodynamic parameters ($X_i$, ${\gamma}_i$, $C_i$, ${a_i}^M$, ${\beta}$, and ${\Delta}H_{mix}$) were calculated by means of the equations derived from the nonideal mixed micellar model. The effects of n-butanol on the micellization of TTAB/Brij 35 mixtures have been also studied by analyzing the measured and calculated thermodynamic parameters.

Thermodynamic Study on the Micellar Properties of TTAB/Brij 35 Mixed Surfactant Systems (TTAB/Brij 35 혼합계면활성제의 미셀화에 대한 열역학적 연구)

  • Gil, Han-Nae;Lee, Byung-Hwan
    • Journal of the Korean Chemical Society
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    • v.51 no.2
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    • pp.129-135
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    • 2007
  • The critical micelle concentrations (CMC) and the counter ion binding constants (B) in a micellar state of the mixed surfactant systems of Tetradecyltrimethylammonium bromide (TTAB) with Polyoxyethylene(23) lauryl ether (Brij 35) in water were determined as a function of α1 (the overall mole fraction of TTAB) by the use of electric conductivity method and surface tensiometer method from 15 oC to 35 oC. Values of thermodynamic parameters (ΔGom, ΔHom, and ΔSom) for the micellization of TTAB/Brij 35 mixtures were calculated and analyzed from the temperature dependence of CMC values. The results say that the measured values of ΔGom are all negative at the whole measured condition but the values of ΔSom and ΔHom are positive or negative, depending on the measured temperature and α1.

Effects of Butanol Isomers on the Mixed Micellization of TTAB/Brij 35 Mixed Surfactant Systems (TTAB/Brij 35 혼합계면활성제의 미셀화에 미치는 부탄올 이성질체들의 효과)

  • Gil, Han-Nae;Lee, Byung-Hwan
    • Journal of the Korean Chemical Society
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    • v.52 no.2
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    • pp.111-117
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    • 2008
  • critical micelle concentration (CMC) and the counter ion binding constant (B) in a mixed micellar state of the trimethyltetradecylammonium bromide (TTAB) with the polyoxyethylene (23) lauryl ether (Brij 35) at 25oC in water and in aqueous solutions of butanol isomers were determined as a function of 1 (the overall mole fraction of TTAB) by the use of electric conductivity method and surface tensiometer method. Various thermodynamic parameters (Xi, i, Ci, aiM, and Hmix) were calculated by means of the equations derived from the nonideal mixed micellar model. The results say that the effects of butanol isomers on the micellization of TTAB/Brij 35 mixtures have been in the order of n-butanol>iso-butanol>t-butanol> water.

Thermodynamics on the Micellization of Pure Cationic(DTAB, TTAB, CTAB), Nonionic(Tween-20, Tween-40, Tween-80), and Their Mixed Surfactant Systems (순수 양이온성(DTAB, TTAB, CTAB), 비이온성(Tween-20, Tween-40, Tween-80) 및 이들 혼합 계면활성제의 미셀화에 대한 열역학적 연구)

  • Lee, Nam-Min;Lee, Byung-Hwan
    • Journal of the Korean Applied Science and Technology
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    • v.30 no.4
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    • pp.679-687
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    • 2013
  • The critical micelle concentration (CMC) and counter-ion binding constant (B) of the pure cationic surfactants (DTAB, TTAB, CTAB), nonionic surfactants (Tween-20, Tween-40, Tween-80), and their mixed surfactants (TTAB/Tween-20, TTAB/Tween-40, TTAB/Tween-80) in aqueous solutions of 4-chlorobenzoic acid were determined by using the UV/Vis absorbance method and the conductivity method from 284 K to 312 K. Thermodynamic parameters (${\Delta}G^o{_m}$, ${\Delta}H^o{_m}$, and ${\Delta}S^o{_m}$), associated with the micelle formation of those surfactant systems, have been estimated from the dependence of CMC and B values on the temperature and carbon length of surfactant molecules. The calculated values of ${\Delta}G^o{_m}$ are all negative within the measured range but the values of ${\Delta}H^o{_m}$ and ${\Delta}S^o{_m}$ are positive or negative, depending on the length of the carbon chain and surfactant.

Conductivity and Surface Tension Behavior for Binary Mixtures over a Various Concentration of TTAB

  • Ahn, Beom-Shu
    • Journal of the Korean Applied Science and Technology
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    • v.23 no.2
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    • pp.160-168
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    • 2006
  • The conductances of trimethyltetradecylammonium bromide (TTAB) plus triphenyltetradecyl phosphonium bromide (TTPB) and TTAB plus trimethylhexadecylammonium bromide (HTAB) over the entire mole fraction range of TTAB were measured in water and in cyclodextrin plus water mixtures at fixed 4 and 8 mM of cyclodextrin at $30^{\circ}C$. The conductivity plot for both binary mixtures shows a single break from which the mixed critical micelle concentration and degree of micelle ionization were computed. From the slope of the conductivity curve, the equivalent ionic conductivities of the monomeric, associated, and the micelle states were calculated and discussed with respect to the surfactant-cyclodextrin complexation in the whole mole fraction range of both surfactant binary mixtures. The association constant K between the respective monomeric surfactant and cyclodextrin cavity of fixed 4 mM cyclodextrin was computed by considering 1:1 association from the surface tension measurement. A comparison among the K values for HTAB-cyclodetrin, TTAB-cyclodextrin, and TTPB-cyclodextrin shows that the former complexation is significantly stronger in comparison to the other ones due to the longer hydrophobic tail.

Three Binding Sets Analysis of $\alpha$-Lactalbumin by Interaction of Tetradecy Trimethyl Ammonium Bromude

  • M.R.Housainfokht
    • Bulletin of the Korean Chemical Society
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    • v.22 no.2
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    • pp.145-148
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    • 2001
  • The interaction between tetradecyl trimethyl ammonium bromide (TTAB) with bovine ${\alpha}-lactalbumin$ has been investigated at pH = 9 and at $37^{\circ}C$ by isothermal titration calorimetry, equilibrium dialysis and UV-Vis spectrophotometry methods. The binding data from unusual Scatchard plot have been analyzed in terms of the Hill equation for three sets of binding sites. The calorimetric data show that TTAB interacts endothermically with ${\alpha}-lactalbumin$ and causes protein unfolding below 2 mM concentration of TTAB, which is confirmed by spectrophotometric data. The unfolding of the protein would be mainly due to occupation of the second set of binding sites.

Solubilization of 4-Alkylbenzoic Acid Isomers by the Aqueous Solution of Tetradecyltrimethylammonium Bromide (테트라데실트리메틸암모늄 브로마이드의 수용액에서 4-알킬벤조산 이성질체들의 가용화에 대한 연구)

  • Lee, Nam-Min;Lee, Byung-Hwan
    • Journal of the Korean Chemical Society
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    • v.56 no.2
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    • pp.188-194
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    • 2012
  • The interaction of 4-alkylbenzoic acid isomers with the micellar system of TTAB (tetradecyltrimethylammonium bromide) was studied by the UV/Vis spectrophotometric method. The solubilization constants ($K_s$) of 4-alkylbenzoic acid isomers into the TTAB micellar system and the critical micelle concentration (CMC) of TTAB have been measured with the change of temperature. Various thermodynamic parameters have been calculated and analyzed from those measurements. The results show that the values of ${\Delta}G^o{_s}$ for the solubilization of all the isomers are negative and the values of ${\Delta}H^o{_s}$ and ${\Delta}S^o{_s}$ are all positive within the measured temperature range. The effects of additives (n-butanol and NaCl) on the solubilization of 4-alkylbenzoic acid isomers have been also measured. There was a great change on the values of $K_s$ and CMC simultaneously with these additives. From these changes we can postulate that the solubilization sites of 4-alkylbenzoic acids are the core or deep palisade region of the TTAB micelle.

Mixed Micellar Properties of DPC with Other Cationic Surfactants (DTAB, TTAB, and CDEAB) (DPC와 다른 양이온성 계면활성제(DTAB, TTAB 및 CDEAB)와의 혼합마이셀화에 관한 연구)

  • Lee, Byung Hwan
    • Journal of the Korean Chemical Society
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    • v.42 no.5
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    • pp.519-525
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    • 1998
  • The critical micelle concentration $(CMC^{\ast})$ and the counterion binding constant (B) in a micellar state of the mixed surfactant systems of dodecylpyridinium chloride (DPC) with dodecyltrimethylammonium bromide (DTAB), tetradecyltrimethylammonium bromide (TTAB), and cetyldimethylethylammonium bromide (CDEAB) were determined at $25^{\circ}C$ as a function of ${\alpha}_1$ (the overall molc fraction of DPC) by the use of electric conductivity method. Various thermodynamic parameters $(X_{i},\;{\gamma}_{I},\;C_{i},\;a^{M}_{i}, \beta,\;{\Delta}H_{mix}, \;and\; {\Delta}G^{o}_{m})$ for the micellization of DPC/DTAB, DPC/TTAB, and DPC/CDEAB mixtures were calculated and analyzed for each system by means of the equations derived from the pseudophase separation model. The results show that the DPC/DTAB mixed system has the greatest deviation and the DPC/CDEAB mixed system has the smallest deviation from the ideal mixed micellar model.

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Thermodynamic Study on the Mixed Micellization of Cationic Surfactants DPC and TTAB (양이온 계면활성제인 DPC와 TTAB의 혼합마이셀화에 대한 열역학적 고찰)

  • Lee, Byung Hwan
    • Journal of the Korean Chemical Society
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    • v.43 no.6
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    • pp.614-620
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    • 1999
  • The critical micelle concentration (CMC) and the counterion binding constant (${\beta}$) at the CMC of the mixtures of Dodecylpyridinium chloride (DPC) and Tetradecyltrimethylammonium bromide (TTAB) have been determined from the concentration dependence of electrical conductance at various temperatures from $4^{\circ}C$ to $36^{\circ}C$. Thermodynamic parameters (${\Delta}C_p$, ${\Delta}G^o_m$, ${\Delta}H^o_m$ and ${\Delta}S^o_m$), associated with the micelle formation of DPC/TTAB mixtures, have been estimated from the temperature dependence of CMC and ${\beta}$values. The measured values of ${\Delta}C_p$ and ${\Delta}G^o_m$ are negative but the values of ${\Delta}S^o_m$ are positive in the whole measured temperature region. The values of ${\Delta}H^o_m$ are positive at low temperature region and negative at high temperature region. The results show that all of the thermodynamic parameters are dependent on temperature and mole fraction of DPC(${\alpha}_DPC$).

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