Solvent effect on the aggregate of fluorinated gemini surfactant at silica surface

Song, Xiaoyan; Li, Peixun; Wang, Yilin; Dong, Chu Chuan; Thomas, Robert K.

doi:10.1016/j.jcis.2006.08.045

Cited by 12 publications

(9 citation statements)

References 34 publications

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“…Increasing of surface contact angles were observed in every condition when compared with the clear blank mica. This agrees with results of Song et al, 38 who reported that contact angles increased with surfactant adsorption due to organic nature of the adsorbed surfactant bilayer.…”

Section: Adsorption Of Pg On Micasupporting

confidence: 93%

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Atomic force microscopy and contact angle studies of polymerizable gemini surfactant admicelles on mica

Asnachinda¹,

O’Haver²,

Sabatini³

et al. 2009

J of Applied Polymer Sci

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Atomic force microscopy (AFM) was used to directly observe and characterize a polymer-modified mica surface prepared using a polymerizable gemini surfactant. Normal tapping mode and contact mode AFM were used to image the treated mica surface morphologies in air and liquid environments, respectively. The root mean square (RMS) roughness of mica surfaces before and after surface modification and polymerization was analyzed from these scans. To determine the effect of styrene adsolubilization on the surfactant-modified mica, AFM measurements of the modified mica were made at various styrene concentrations. Contact angle measurements were also made to further characterize the nature of the surfactant-modified mica surface. The surface morphology and surface hydrophilicity were observed to be different for the modified mica after polymerization. In addition, the polymerized surface maintained its morphology after washing/desorption studies demonstrating the stability of the polymerized surfactant film.

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Section: Adsorption Of Pg On Micasupporting

confidence: 93%

“…As mentioned by Song et al,38 contact angle measurements can provide useful information on the nature of surfactant aggregates on the surface. Contact angle measurements in Table III indicate that the surface hydrophobicity (contact angle) increases with surfactant adsorption on the mica even at the low surfactant concentration.…”

Section: Resultsmentioning

confidence: 99%

Atomic force microscopy and contact angle studies of polymerizable gemini surfactant admicelles on mica

Asnachinda¹,

O’Haver²,

Sabatini³

et al. 2009

J of Applied Polymer Sci

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show abstract

“…The dimeric surfactants have CMC values 10 to 100 times less than those of monomeric surfactants [112]. Most of the adsorption studies are of cationic gemini surfactants on silica [63,[111][112][113][114][115][116][117] and few studies on clay and lime stone [118,119]. Studies on anionic gemini surfactants are also very few [54,119,120].…”

Section: Gemini Surfactant Adsorptionmentioning

confidence: 99%

Surfactant-enhanced remediation of organic contaminated soil and water

Paria

2008

Advances in Colloid and Interface Science

485

237

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“…Therefore, in the field of material science much attention is also paid to these amphiphiles with spacers; that is, some papers on fluorinated gemini surfactants have been reported. [24][25][26][27][28][29] As far as we know, a few papers concerning Langmuir monolayers of gemini amphiphiles have been reported. 30,31 The surface properties of hydrogenated double long-chain salts with a hydrocarbon spacer have been investigated previously.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some gemini amphiphiles have been found to possess high transfection activities by containing DNA molecules in their vesicles. − Moreover, it was reported that gemini amphiphiles forming rod-like micelles can be used as templates for preparation of nanoparticles. , Changes in spacer length or species in a molecule improve and control these unique features. Therefore, in the field of material science much attention is also paid to these amphiphiles with spacers; that is, some papers on fluorinated gemini surfactants have been reported. − As far as we know, a few papers concerning Langmuir monolayers of gemini amphiphiles have been reported. , …”

Section: Introductionmentioning

confidence: 99%

Langmuir Monolayer Properties of Perfluorinated Double Long-Chain Salts with Divalent Counterions of Separate Electric Charge at the Air−Water Interface

et al. 2007

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The novel perfluorinated double long-chain salts with divalent counterions of separate electric charge, 1,1-(1,omega-alkanediyl)-bispyridinium perfluorotetradecane- carboxylate [CnBP(FC14)2 : n = 2, 6, 10, 14], were newly synthesized and their interfacial behavior was investigated by Langmuir monolayer methods. Surface properties [surface pressure (pi)-, surface potential (DeltaV)-, dipole moment (micro perpendicular)-area (A) isotherms] and morphological images of CnBP(FC14)2 monolayers on a subphase of water and on various NaCl concentrations were measured by employing the Wilhelmy method, the ionizing electrode method, fluorescence microscopy (FM), and Brewster angle microscopy (BAM). CnBP(FC14)2 formed a stable monolayer on water at 298.2 K, where these pi-A isotherms shifted to a larger molecular area with increasing charge separation and had no transition point from a disordered phase to an ordered one. On the contrary, the pi-A isotherms on NaCl solutions moved to the smaller areas, showed the transition and higher collapse pressures compared to the pi-A isotherms on water. These results suggested that a sodium chloride subphase induced the condensation of CnBP(FC14)2 molecules upon compression. In addition, it is quite noticeable that a dissociation of CnBP counterion from CnBP(FC14)2 occurs on NaCl solutions, depending on the extent of charge separation. This phenomenon was supported by the changes of the limiting area, transition pressure, collapse pressure, repeated compression-expansion cycle curve, and DeltaV behavior of perfluorotetradecanoic acid (FC14). Furthermore, temperature dependence of these monolayers was investigated, and an apparent molar quantity change on the phase transition was evaluated on 0.15 M NaCl. The morphological behavior of CnBP(FC14)2 and FC14 monolayers was also confirmed by FM and BAM images.

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Solvent effect on the aggregate of fluorinated gemini surfactant at silica surface

Cited by 12 publications

References 34 publications

Atomic force microscopy and contact angle studies of polymerizable gemini surfactant admicelles on mica

Atomic force microscopy and contact angle studies of polymerizable gemini surfactant admicelles on mica

Surfactant-enhanced remediation of organic contaminated soil and water

Langmuir Monolayer Properties of Perfluorinated Double Long-Chain Salts with Divalent Counterions of Separate Electric Charge at the Air−Water Interface

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