In-situ investigations of coadsorbed cationic surfactants on charged surfaces: a SERS microprobe study

“…We used the interpretation of infrared spectra of deuterated methylammonium cations given by Ebsworth and Sheppard [8] and the results of ab initio LCAO-MO-SCF and DFT calculations [7] to identify the spectroscopic signatures of the tetramethylammonium cation. The alkyl tail has some well-established IR-bands [9].…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C₁₄TAB Nanoparticles: Structure and Stability

Borodko

Jones²,

Lee³

et al. 2009

Langmuir

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“…The new silver clusters absorb both surfactant molecules and halide ions strongly from the solution. The surfactant molecules probably act as capping agents and are chemically absorbed onto the surface of silver nanoparticles to form compact and uniform double layers in tail-tail mode [24][25][26]. On the other hand, the coadsorbed Br − ions (form Ag 10 Br − cluster) act as a bridge for the adsorption of surfactants (CTA + ) [26].…”

Section: Resultsmentioning

confidence: 99%

“…The surfactant molecules probably act as capping agents and are chemically absorbed onto the surface of silver nanoparticles to form compact and uniform double layers in tail-tail mode [24][25][26]. On the other hand, the coadsorbed Br − ions (form Ag 10 Br − cluster) act as a bridge for the adsorption of surfactants (CTA + ) [26]. In the mixed cationic-anionic (catanionic) surfactant solutions, the strong interaction between headgroups (-SO − 4 and R 4 N + ) mediated by tail-tail interactions leads to a strong synergism [27], which favors the formation of worm-like micelles and directs the growth of one-dimensional nanostructure [28,29].…”

Section: Resultsmentioning

confidence: 99%

Controlling synthesis of silver nanowires and dendrites in mixed surfactant solutions

Zheng¹,

Zhu²,

Yan³

et al. 2003

Journal of Colloid and Interface Science

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“…Seemingly, discrepancies between the kinetics of 3 H-TX-100 adsorption and the values of relative adsorption of TX-100 from mixed solutions with afore- mentioned cationic surfactants on negatively charged glass surface (solution pH 6.5) are determined by the different orientation of hydrocarbon chains of cetylpyridinium and cetyltrimethylammonium cations in mixed adsorption layers [30], sterical constraints upon the coordination of ethylene oxide chains of TX-100 near cations [31], and by the different degrees of their interaction with TX-100 molecules [32]. Autoradiography data demonstrated that TX-100 is retained in mixed CTAB/TX-100 adsorption layer and is almost completely removed from the CPC/TX-100 layer after rinsing with water (table).…”

mentioning

confidence: 99%

Autoradiography studies of the processes of wetting and spreading

et al. 2005

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Wetting and spreading of liquids over solid surfaces are the important stages of many natural and technological processes. Systematic studies in this branch of research covering the diversity of systems with various types of interaction between the liquid and the solid are performed, using direct methods based either on measuring the contact angles or the observation of the movement of wetting perimeter [1][2][3][4]. In modern units, computer-aided processing of the images of droplet or liquid front is performed [5]. Indirect methods such as the rupture of liquid "bridges" [6,7] and capillary rise method [1,8] are used, along with direct methods. In the case of well-wetting liquids, small contact angles on solid surface are measured by studying the light interference in thin menisci near the three-phase contact line (TPCL) [9][10][11].In general, these methods are sufficient to study the regularities of wetting and spreading, if the processes of interaction between the liquid and the solid are of no significance. However, in many cases, the diffusion, the mutual dissolution of liquid and substrate, and chemical reactions greatly affect the statics and dynamics of wetting [1,2]. To analyze the propagation of liquid front limited by physicochemical processes, one needs information on the distribution of substance within the bounds of wetted area, for example, between the grain body and grain boundaries, as well as on the TPLC structure.When discussing the wetting of various solids by surfactant solutions, it is also important to know the surfactant distribution on the solid surface, in particular, near the TPLC.Considerable opportunities to solve such tasks are provided by the tracer technique in combination with autoradiography. The aim of this work is to report results of studying the wetting and spreading processes by autoradiography.The autoradiography is a photographic method of the detection of ionizing radiation of radionuclide preliminarily added to the studied substance [12].Convenient for analysis photographic image (autoradiogram) is formed when a certain radiation dose hits the unit surface area of a photodetector.Autoradiograms are taken upon the direct contact between the studied surface and the detector. Then, they are analyzed visually, photometric measurements are performed, and the electron scanning of negative image or photograph is made. Photometric curves presenting the dependences of the degree of autoradiogram blackening on the labelled substance concentration make it possible to quantitatively estimate the substance distribution over the spreading area of liquid phase. The amount of the substance is proportional to the intensity of autoradiogram blackening. At present, there is a software package that allows one to digitally analyze the autoradiograms [13], thus broadening the method's possibilities. One can determine not only the distribution of liquid phase over the solid surface but also the adsorption of surfactants or impurities on this surface, study the kinetics of formation and the s...

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In-situ investigations of coadsorbed cationic surfactants on charged surfaces: a SERS microprobe study

Cited by 44 publications

References 11 publications

Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C₁₄TAB Nanoparticles: Structure and Stability

Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C₁₄TAB Nanoparticles: Structure and Stability

Controlling synthesis of silver nanowires and dendrites in mixed surfactant solutions

Autoradiography studies of the processes of wetting and spreading

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In-situ investigations of coadsorbed cationic surfactants on charged surfaces: a SERS microprobe study

Cited by 44 publications

References 11 publications

Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C14TAB Nanoparticles: Structure and Stability

Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C14TAB Nanoparticles: Structure and Stability

Controlling synthesis of silver nanowires and dendrites in mixed surfactant solutions

Autoradiography studies of the processes of wetting and spreading

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Product

Resources

About

Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C₁₄TAB Nanoparticles: Structure and Stability

Spectroscopic Study of Tetradecyltrimethylammonium Bromide Pt−C₁₄TAB Nanoparticles: Structure and Stability