Adsorption of styryl pyridinium dyes on polyethylene-glycol-treated silica

Parida, Sudam K; Mishra, Bijay K.

doi:10.1016/s0927-7757(97)00114-3

Cited by 38 publications

(24 citation statements)

References 9 publications

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“…and the oxygen atom of the ethoxy chains Table 1 Parameters obtained from the classical model for the interaction of BG ? of TX-100 molecules which is similar to the interaction of silanol groups of silica gel with TX-100 [17,18]. This interaction along with further hydrophobic interaction of BG ?…”

Section: Resultsmentioning

confidence: 65%

Kinetics of brilliant green fading in the presence of TX-100, DTAB and SDS

Samiey

Dargahi

2010

Reac Kinet Mech Cat

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The rate constant of alkaline fading of brilliant green (BG ? ) was measured in the presence of non ionic (TX-100), cationic (DTAB) and anionic (SDS) surfactants. This reaction was studied under pseudo first-order conditions at 283-303 K. The rate of reaction showed remarkable dependence on the electrical charge of the used surfactants. It was observed that the reaction rate constant increases in the presence of TX-100 and DTAB (catalytic effect) and decreases in the presence of SDS (inhibitory effect). Binding constants and the related thermodynamic parameters were obtained by the classical model. The results show that binding of BG ? to TX-100 is exothermic and binding of BG ? to DTAB and SDS is endothermic in the used concentration range of surfactants.

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Section: Resultsmentioning

confidence: 65%

Kinetics of brilliant green fading in the presence of TX-100, DTAB and SDS

Samiey

Dargahi

2010

Reac Kinet Mech Cat

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“…The surface of silica gel is hydrophilic and adsorption of TX-100 in the first layer merely requires replacement of a silanolwater hydrogen bond by a silanol-ethoxy hydrogen bond [25]. Like polyethylene glycol, the ether oxygens act as hydrogen bond acceptors [45,50]. As surface coverage increases, strong lateral interactions between neighboring hydrophobes probably lead to enhanced adsorption and the observed upturn in the adsorption isotherm [45].…”

Section: Adsorption Of Tx-100mentioning

confidence: 99%

Adsorption of triton X-100 on silica gel: effects of temperature and alcohols

Samiey

Golestan

2010

Open Chemistry

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Adsorption of Triton X-100 (TX-100) on silica gel has been studied as a function of temperature (308-328 K) and composition for mixtures of water with ethanol or t-butanol. The adsorption capacity of silica gel for TX-100 decreases with increase in alcohol content. Adsorption isotherms of TX-100 on silica gel are four-region and were analyzed using the ARIAN (adsorption isotherm regional analysis) model. Data in regions 2, 3 and 4 were fitted to the Temkin, bilayer and reverse desorption isotherms, respectively. The results show that adsorption of TX-100 on silica gel in water and alcohol-water binary mixtures occurs mainly through formation of monolayer surface aggregates or low bilayer coverage. © Versita Sp. z o.o.

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“…The adsorption of surfactants on solid surfaces results in significant modification of the solid-liquid interfacial properties (1)(2)(3)(4)(5)(6). Industrial processes that depend mainly on the nature of the interface, such as flotation, flocculation, and ceramic processing, can be controlled by manipulating surface characteristics.…”

mentioning

confidence: 99%

“…Selective flocculation of minerals has been observed using hydrophobic polymers when the minerals are pretreated with xanthate surfactants (11). Parida et al (1)(2)(3) reported that the preadsorption of polyethylene glycol or cetyltrimethyl ammonium bromide on a silica surface or treatment of a silica surface with alkali leads to different adsorption characteristics of a series of monochromophoric and bischromophoric styryl pyridinium dyes from naked silica.…”

mentioning

confidence: 99%

Organization of amphiphiles VI. A comparative study of the orientation of polyoxyethylated alkyl phenols at the air‐water and the silica‐water interface

Misra

Somasundaran

2004

J Surfact & Detergents

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The adsorption behavior on silica of a series of polyoxyethylated alkyl phenols of varying hydrophobicities and hydrophilicities was studied by determining the adsorption isotherm along with the zeta potential of silica. An increase in the concentration of each of the surfactants caused the zeta potential to become less negative and ultimately to reach a plateau; similarly, the adsorption isotherm also plateaued. These results were attributed to the flat orientation of the surfactants caused by hydrogen bonding of the oxygen atom of the oxyethylene group with the silanol group of the silica, which led to the formation of a thin oxyethylene layer at the silica-water interface. This layer masked a constant fraction of the silica surface. A model for the orientation of the surfactants at the silica-water interface was proposed, based on a "molecular parking area" (i.e., space occupied by the molecule during adsorption at the silica-water interface) of the surfactants on the silica surface.

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Adsorption of styryl pyridinium dyes on polyethylene-glycol-treated silica

Cited by 38 publications

References 9 publications

Kinetics of brilliant green fading in the presence of TX-100, DTAB and SDS

Kinetics of brilliant green fading in the presence of TX-100, DTAB and SDS

Adsorption of triton X-100 on silica gel: effects of temperature and alcohols

Organization of amphiphiles VI. A comparative study of the orientation of polyoxyethylated alkyl phenols at the air‐water and the silica‐water interface

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