Interactions and film formation in polyethylenimine–cetyltrimethylammonium bromide aqueous mixtures at low surfactant concentration

Soft Matter ◽  
2007 ◽  
Vol 3 (6) ◽  
pp. 747-753 ◽  
Author(s):  
Hansel Comas-Rojas ◽  
Eduardo Aluicio-Sarduy ◽  
Simón Rodríguez-Calvo ◽  
Aurora Pérez-Gramatges ◽  
Stephen J. Roser ◽  
...  
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Surfactant Concentration ◽  
Film Formation ◽  
Aqueous Mixtures

The Adsorption and Condensed Film Formation of Cetyltrimethylammonium Bromide at the Mercury/Electrolyte Interface

2002 ◽  
Vol 248 (2) ◽  
pp. 347-354 ◽  
Author(s):  
Antonis Avranas ◽  
Utz Retter ◽  
Efi Malasidou
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Film Formation ◽  
Condensed Film ◽  
Electrolyte Interface

scholarly journals Two-step synthesis of high aspect ratio gold nanorods

2006 ◽  
Vol 4 (1) ◽  
pp. 160-165 ◽  
Author(s):  
Tom Mortier ◽  
André Persoons ◽  
Thierry Verbiest
Keyword(s):  
Aspect Ratio ◽  
Gold Nanorods ◽  
High Aspect Ratio ◽  
Cetyltrimethylammonium Bromide ◽  
Surfactant Concentration ◽  
Synthetic Method ◽  
Aspect Ratios ◽  
Seed Mediated

AbstractWe describe a very simple, two-step synthetic method to prepare gold nanorods with extremely high aspect ratios (> 20) and average lengths of more than 1000 nm. The method is based on a seed-mediated growth in presence of the surfactant cetyltrimethylammonium bromide. The length and aspect ratios of the nanorods can be manipulated by varying the surfactant concentration.

Phase Behavior of Aqueous Mixtures of 2-Phenylbenzimidazole-5-sulfonic Acid and Cetyltrimethylammonium Bromide:  Hydrogels, Vesicles, Tubules, and Ribbons

2008 ◽  
Vol 112 (10) ◽  
pp. 2901-2908 ◽  
Author(s):  
D. Gräbner ◽  
L. Zhai ◽  
Y. Talmon ◽  
J. Schmidt ◽  
N. Freiberger ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Sulfonic Acid ◽  
Cetyltrimethylammonium Bromide ◽  
Aqueous Mixtures

Direct Evidence for β-Cyclodextrin-Induced Aggregation of Ionic Surfactant below Critical Micelle Concentration

1994 ◽  
Vol 48 (11) ◽  
pp. 1428-1431 ◽  
Author(s):  
Yun-Bao Jiang ◽  
Xiu-Juan Wang
Keyword(s):  
Critical Micelle Concentration ◽  
Cetyltrimethylammonium Bromide ◽  
Surfactant Concentration ◽  
Direct Evidence ◽  
Sodium Dodecylsulfate ◽  
Fluorescence Emission ◽  
Peak Height ◽  
Ionic Surfactant ◽  
Fixed Amount ◽  
Induced Aggregation

The fluorescence emission of p-dimethylaminochalcone (DMAC) has been monitored in β-cyclodextrin (β-CD) and cetyltrimethylammonium bromide (CTMAB) or sodium dodecylsulfate (SDS) mixture. In the presence of a fixed amount of β-CD, a peak-shaped variation is observed in the curve of DMAC fluorescence intensity vs. surfactant concentration below critical micelle concentration (cmc). The peak height is dependent on β-CD concentration, and no peak is noted in the absence of β-CD. Such a peak-shaped variation in DMAC fluorescence emission is shown to be direct evidence for β-CD-induced aggregation of the surfactant below cmc in aqueous solution. The 1:1 surfactant/β-CD inclusion complex is the hydrophobic source inducing the aggregation.

Phase behavior and microstructure evolution in aqueous mixtures of cetyltrimethylammonium bromide and sodium dodecyl tri-oxyethylene sulfate

2009 ◽  
Vol 12 (1-2) ◽  
pp. 18-29 ◽  
Author(s):  
P.A. Hassan ◽  
Travis K. Hodgdon ◽  
Masanobu Sagasaki ◽  
Gerhard Fritz-Popovski ◽  
Eric W. Kaler
Keyword(s):  
Phase Behavior ◽  
Microstructure Evolution ◽  
Cetyltrimethylammonium Bromide ◽  
Sodium Dodecyl ◽  
Aqueous Mixtures

scholarly journals Volumetric studies of alcohols in water and aqueous micelle solutions of cetyltrimethylammonium bromide

1970 ◽  
Vol 24 (2) ◽  
pp. 143-157 ◽  
Author(s):  
T Parvin ◽  
M Alauddin ◽  
M Rokonuzzaman
Keyword(s):  
Molar Volume ◽  
Apparent Molar Volume ◽  
Cetyltrimethylammonium Bromide ◽  
Surfactant Concentration ◽  
Partial Molar Volumes ◽  
Chemical Society ◽  
Volume Data ◽  
Palisade Layer ◽  
Molar Volumes ◽  
Partial Molar Expansibilities

The volumetric properties of 1-propanol, cyclohexanol and butoxyethanol in water and CTAB water mixtures have been studied. The apparent molar volumes of 1-propanol, cyclohexanol and butoxyethanol in water and in aqueous solutions of CTAB were determined from density data. The partial molar volumes of the alcohols in water and aqueous micelle solutions at infinite dilution, V20(mic) were obtained from apparent molar volume data and compared with the corresponding values. The standard partial molar expansibilities, E20(mic) of the solubilizates were evaluated from V20(mic) data at various temperatures. The volumetric studies of alcohols in CTAB micelles indicate that alcohols on the average are preferentially solubilized in the palisade layer of the micelle and increasing amount of each is transferred more deep into the palisade layer of the micelle with increasing surfactant concentration and temperature. The results of standard partial molar volume, V20 and standard partial molar expansibilities, E20 are reported and discussed. DOI: http://dx.doi.org/10.3329/jbcs.v24i2.9703 Journal of Bangladesh Chemical Society, Vol. 24(2), 143-157, 2011

Influence of Ionic Strength and Surfactant Concentration on Electrostatic Surfacial Assembly of Cetyltrimethylammonium Bromide-Capped Gold Nanorods on Fully Immersed Glass

Langmuir ◽  
2010 ◽  
Vol 26 (14) ◽  
pp. 12433-12442 ◽  
Author(s):  
Abdul Rahim Ferhan ◽  
Longhua Guo ◽  
Dong-Hwan Kim
Keyword(s):  
Ionic Strength ◽  
Gold Nanorods ◽  
Cetyltrimethylammonium Bromide ◽  
Surfactant Concentration

Interaction of Porphyrins with Cetyltrimethylammonium Bromide Micelles in Methylene Chloride

1998 ◽  
Vol 02 (04) ◽  
pp. 345-351 ◽  
Author(s):  
NILKAMAL BAG ◽  
ARUNA DHATHATHREYAN ◽  
ASIT BARAN MANDAL ◽  
TIRUMALACHARI RAMASAMI
Keyword(s):  
Free Energy ◽  
Cetyltrimethylammonium Bromide ◽  
Methylene Chloride ◽  
Aggregation Number ◽  
Film Formation ◽  
Cetylpyridinium Chloride ◽  
Standard Free Energy ◽  
Micelle Formation ◽  
Standard Free Energy Change ◽  
Biphasic Model

The formation of micelles of cetyltrimethylammonium bromide (CTAB) in CH 2 Cl 2 solution has been reported for the first time. The critical micelle concentrations (cmc) of CTAB in CH 2 Cl 2 solution were determined using conductivity and fluorescence techniques in both the absence and presence of 1,3,5,7-tetramethyl-2,4,6,8-tetra(2,4,6-triisopropylphenyl)porphyrin (TMTIP). The cmc values obtained by conductivity and fluorescence methods were found to be 75 and 78 mM, respectively. The aggregation numbers (N) of CTAB and porphyrin–CTAB in CH 2 Cl 2 solution were determined using pyrene and N-cetylpyridinium chloride (CPC) as the fluoroprobe and quencher, respectively. The N of CTAB in CH 2 Cl 2 solution was also determined using the porphyrin (in lieu of pyrene) as the fluoroprobe and CPC as the quencher. The N of CTAB obtained by these probes was found to be 134 ± 3 and 140 ± 5, respectively. This suggests that the porphyrin could be used as an excellent fluoroprobe for determination of the aggregation number of CTAB micelles. The results of both cmc and aggregation number suggest that the micelle formation of CTAB in CH 2 Cl 2 solution is favored in the presence of the porphyrin. The standard free energy change for micelle formation of CTAB in CH 2 Cl 2 solution was calculated using a biphasic model. The standard free energy transfer [Formula: see text] of CTAB micelles from CH 2 Cl 2 to porphyrin environment has been found to be −1.0 kJ mol−1 at 25 °C, suggesting that the above transfer is difficult. However, the reverse situation, i.e. binding of the porphyrin to CTAB micelles, is more probable. The Langmuir–Blodgett (LB) film formation of the porphyrin and metalloporphyrins ( Fe , Co , Cu , Zn ) has also been studied and the UV-vis spectra of these films have been analyzed.

Multiple thin film formation from dilute mixtures of polyethyleneimine (PEI) and cetyltrimethylammonium bromide (CTAB)

2009 ◽  
Vol 339 (2) ◽  
pp. 495-501 ◽  
Author(s):  
H. Comas-Rojas ◽  
G. Fernández-Catá ◽  
K.J. Edler ◽  
S.J. Roser ◽  
A. Pérez-Gramatges
Keyword(s):  
Thin Film ◽  
Cetyltrimethylammonium Bromide ◽  
Film Formation ◽  
Thin Film Formation
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