Conformations of tethered polymer chains: a fluorescence energy transfer study

Jayachandran, Kizhakkedathu; Maiti, Souvik; Chatterji, P. R.

doi:10.1016/s0032-3861(01)00105-7

Cited by 8 publications

(8 citation statements)

References 54 publications

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“…It has been suggested , that on addition of SDS the Na + counterions of the surfactant bind directly to the oxygen atoms of the PEG, causing the strand to contract and coil in solution. This behavior has recently been observed in tethered PEG strands by Jayachandran et al using fluorescence energy transfer (FRET). The exact structure adopted by the polymer on binding to the surfactant headgroup is still under debate.…”

Section: Discussionmentioning

confidence: 53%

“…Little work has been performed to date on the molecular conformation of PEG upon adsorption, principally due to the lack of suitable techniques that are capable of elucidating surface structural information in situ. With the advent of nonlinear optical spectroscopy and single-molecule fluorescence techniques, this situation is now changing. − …”

Section: Introductionmentioning

confidence: 99%

“…With the advent of nonlinear optical spectroscopy and single-molecule fluorescence techniques, this situation is now changing. [9][10][11] The properties of higher-molecular-weight PEG, often referred to as PEO, in solution and upon adsorption are dominated by the chemistry of the ethylene oxide repeat unit and entropic considerations of long polymer chains in solution. As the PEG molecular weight decreases, the effect of the chain-terminating groups become increasingly important both for behavior in solution and in the adsorption/desorption of PEG.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Sodium Dodecyl Sulfate at the Hydrophobic Solid/Aqueous Solution Interface in the Presence of Poly(ethylene glycol): Dependence upon Polymer Molecular Weight

2006

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The polar orientation and degree of conformational order of sodium dodecyl sulfate (SDS) adsorbed at the hydrophobic octadecanethiol/aqueous solution interface in the presence of poly(ethylene glycol) (PEG) has been investigated as a function of the surfactant concentration and the molecular weight of the polymer. Sum frequency generation (SFG) vibrational spectroscopy was employed to obtain spectra of interfacial surfactant; weak SFG signals from interfacial polymer were also detected for polymer molecular weights of 900 and above. The phase of the SFG spectra indicated that both the surfactant and polymer had a net orientation of their CH2 and/or CH3 groups toward the hydrophobic surface. Spectra of SDS in the presence of mixed polymer/surfactant solutions showed increasing conformational order as the surfactant concentration was raised. At the lowest surfactant concentrations, the spectra of SDS were weaker in the presence of the polymer than in its absence. All PEG molecular weights investigated, with the exception of PEG 400, gave rise to significant inhibition of ordered surfactant adsorption below the critical micelle concentration. The greatest inhibitory effect was noted for PEG 900. Probing interfacial PEG specifically through the use of perdeuterated SDS revealed that the polymer spectral intensity decreased monotonically as the surfactant concentration was increased for all polymer molecular weights where a PEG spectrum was apparent. These findings are interpreted in terms of the displacement of preadsorbed polymer as the surfactant concentration increases. This result is compatible with observations of adsorption from SDS/PEG solutions at solid/solution and solution/air interfaces made using other techniques.

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Section: Discussionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of Sodium Dodecyl Sulfate at the Hydrophobic Solid/Aqueous Solution Interface in the Presence of Poly(ethylene glycol): Dependence upon Polymer Molecular Weight

2006

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“…It is thus urgent to obtain a modified technique for the preparation of MMS with high magnetite contents. Dispersion polymerization has been suggested as an alternative method for obtaining a micrometer-sized particle distribution [23]. It is a complex process starting with a homogeneous solution of monomers, solvents, stabilizer and initiator.…”

Section: Introductionmentioning

confidence: 99%

Preparation of poly(styrene–glucidylmethacrylate)/Fe3O4 composite microspheres with high magnetite contents

Zhang

Chen

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…Contrary to these methods, which are either very complicated or induce broad particle size distribution, dispersion polymerization was suggested as an alternative method to produce micrometer-size particles. [19] Its main advantage is in its simplicity: it is a single-step technique, which under suitable reaction conditions yields monodisperse (monosized) particles. Dispersion polymerization is a complex process which begins as a homogeneous solution of monomers, solvents, stabilizer and initiator.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Characteristics of Ferrimagnetic Microspheres Prepared by Dispersion Polymerization

Horák

Lednický

Petrovský³

et al. 2004

Macro Materials & Eng

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Summary: A magnetite‐based colloid was obtained by chemical co‐precipitation of iron(II) and iron(III) salts in alkaline medium and stabilized with oleic acid. Magnetic micron‐size poly(2‐hydroxyethyl methacrylate) (PHEMA)‐based latex particles of narrow size distribution were prepared by dispersion polymerization in toluene/2‐methylpropan‐1‐ol in the presence of three kinds of ferrimagnetic nanoparticles: chromium dioxide, maghemite, and magnetite. Cellulose acetate butyrate and dibenzoyl peroxide were used as the stabilizer and the initiator, respectively. The magnetic characteristics were examined with respect to behavior in the magnetic field and thermal stability. Our results show that chromium dioxide and derived PHEMA particles are magnetically stable in moderate temperatures up to about 100 °C. Maghemite particles are thermally stable up to 500 °C. Measurements of the hysteresis loops and remanent magnetization showed that embedment of magnetic particles in organic polymer has practically no effect on their magnetic hysteresis. All the samples reached magnetic saturation in fields below 0.3 T (saturation of magnetite). Regarding separation by the magnetic field, ultrafine, superparamagnetic magnetite particles show the best performance because of their magnetic susceptibility, the highest measured here, and the absence of coercive force.

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Conformations of tethered polymer chains: a fluorescence energy transfer study

Cited by 8 publications

References 54 publications

Adsorption of Sodium Dodecyl Sulfate at the Hydrophobic Solid/Aqueous Solution Interface in the Presence of Poly(ethylene glycol): Dependence upon Polymer Molecular Weight

Adsorption of Sodium Dodecyl Sulfate at the Hydrophobic Solid/Aqueous Solution Interface in the Presence of Poly(ethylene glycol): Dependence upon Polymer Molecular Weight

Preparation of poly(styrene–glucidylmethacrylate)/Fe3O4 composite microspheres with high magnetite contents

Magnetic Characteristics of Ferrimagnetic Microspheres Prepared by Dispersion Polymerization

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