Reversible Assembly and Disassembly of Micelles by a Polymer That Switches between Hydrophilic and Hydrophobic Wettings

Dutta, Kingshuk; Mahale, Rajashree Y.; Arulkashmir, Arulraj; Krishnamoorthy, Kothandam

doi:10.1021/la301760a

Cited by 42 publications

(26 citation statements)

References 60 publications

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“…The surfactants influence the physical properties (morphology, solubility) of the resultant polymer [32]. It has been reported that nanotubes of hydrophobic interiors were prepared by disassembling anionic micelles in the inner walls of positive charge bearing conjugated polymer [33]. It was also studied that supramolecular complexes involving nanoscopic amphiphilic assemblies (AAs) and polyelectrolytes have been used to prepare a variety of materials, wherein the dynamic AAs retain the structural features [34].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Perfluorooctanoic Acid Anionic Surfactant Doped Nanosize Polyaniline

Mahalakshmi¹,

Vedhi²

2014

OJSTA

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Surfactant doped polyaniline was synthesized in the aqueous solution of aniline and anionic surfactant of perfluorooctanoic acid (PFO) by chemical synthesis using potassium peroxy disulphate as an oxidant by varying the aniline to surfactant ratio. The solubility of the chemically prepared surfactant doped polyaniline (PANI) was ascertained and it showed good solubility in dimethyl sulfoxide (DMSO), dimethylformamide (DMF), acetone, acetonitrile, ethanol, aceticacid, trichloroethylene, dichloromethane, tetrahydrofuran, ethylacetate, diethylether, toluene, chloroform and sparingly soluble in n-hexane and water. The prepared polymers were characterized by fourier transform infrared spectroscopy (FTIR), UV-visible, X-ray diffraction (XRD), cyclic voltammetric (CV), EIS and scanning electron microscopy (SEM). The analysis of UV-visible and FTIR showed that aniline has been polymerized to PANI in its conducting emeraldine form. FTIR spectra showed that the peaks at 1670, 3315 and 1400 cm −1 corresponded to PFO. FTIR spectra showed that amine peak observed at 1593 cm −1 was shifted to lower wave number due to the interaction between PANI and the surfactant. SEM analysis showed that the variation in morphology of doped PANI was predominantly dependent on the concentration of the surfactant. Elemental analysis was done by energy dispersive spectroscopic (EDAX) which shows the presence of C, N, O, S and F. XRD pattern showed that the formation of nanosized (18 nm) and crystalline polymer. CV studies of the synthesized polymer exhibited good adherent behavior on electrode surface. It exhibited three oxidation peaks at approximately 0.283 V, 0.541 V and 0.989 V and two reduction peaks at 0.1421 and 0.3854 V. Electrical conductivity of PFO doped PANI was studied by impedance spectroscopic method.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Perfluorooctanoic Acid Anionic Surfactant Doped Nanosize Polyaniline

Mahalakshmi¹,

Vedhi²

2014

OJSTA

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“…TEM images of a) PAni NFs and b) PAni NWs , . Reproduced by permission of The American Chemical Society and The Royal Society of Chemistry, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Polymerization of aniline was performed at the interface of an aqueous layer containing hydrochloric acid (HCl, reagent grade, LobaChemie) and the oxidant ammonium peroxodisulfate (APS, Sigma Aldrich), and an organic layer containing aniline monomer (Sigma Aldrich) [27][28][29]. The ratio of the reagent used was aniline:APS:HCl = 1:1:2.…”

Section: Synthesis Of Pani Nfs and Nwsmentioning

confidence: 99%

Nanostructured Polyaniline: An Efficient Support Matrix for Platinum‐Ruthenium Anode Catalyst in Direct Methanol Fuel Cell

et al. 2018

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The quest for an efficient catalyst support material for improved deposition of electrocatalyst nanaoparticles towards application in methanol oxidation reaction has been an active field of research for last few decades. The use of highly expensive, although efficient, platinum‐ruthenium (Pt‐Ru) catalyst demands its minimum loading requirement and maximum utilization. We, herein, propose the potentiality of polyaniline (PAni) nanostructures‐based catalyst support materials towards this utilization aspect. It was realized that the PAni nanowhiskers (NWs) support exhibited better dispersion and higher utilization of the deposited Pt‐Ru nanoparticles, as compared to the PAni nanofibers (NFs) and the commercial Vulcan carbon (C) supports. This led to the exhibition of higher electrocatalytic activity, suppressed catalyst poisoning and better stability by the Pt‐Ru/PAni NWs catalyst system. The charge transfer rates of the catalyst systems were found to be in the order Pt‐Ru/PAni NWs > Pt‐Ru/PAni NFs > Pt‐Ru/C. Moreover, the Pt‐Ru/PAni NWs catalyst system demonstrated the lowest solution resistance and the best performance in a direct methanol fuel cell (DMFC).

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“…The unremitting research endeavor on the architecture of polymeric micellar assemblies exhibit potentials for enhanced stability . However, the undesirable release caused by dilution or interaction with the biological components largely restricted the biomedical application …”

Section: Introductionmentioning

confidence: 99%

Reversible Deactivation of Enzymes by Redox‐Responsive Nanogel Carriers

Peng

Rübsam

Jakob

et al. 2016

Macromol. Rapid Commun.

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Novel redox-responsive polymeric nanogels that allow highly efficient enzyme encapsulation and reversible modulation of enzyme activity are developed. The nanogel synthesis and encapsulation of enzyme are performed simultaneously via in situ crosslinking of pyridyldisulfide-functionalized water-soluble reactive copolymers, which are synthesized via reversible addition-fragmentation chain transfer copolymerization. Obtained nanogels with loaded cellulase demonstrate very good colloidal stability in aqueous solutions. The enzymatic activity of cellulase is greatly reduced when encapsulated in the nanogels and rapidly recovered in 10 × 10 m dithiothreitol solution. Fluorescence resonance energy transfer (FRET)-based experiments indicate that the recovered enzymatic activity is mainly ascribed to the release of the enzyme due to the degradation of the disulfide crosslinking network after addition of dithiothreitol (DTT), instead of the enhanced substrate transport rate. The developed enzyme immobilization method opens new possibilities for reversible activation/deactivation of enzymes and opens up new directions for targeted protein therapy and biotechnology applications.

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Reversible Assembly and Disassembly of Micelles by a Polymer That Switches between Hydrophilic and Hydrophobic Wettings

Cited by 42 publications

References 60 publications

Synthesis and Characterization of Perfluorooctanoic Acid Anionic Surfactant Doped Nanosize Polyaniline

Synthesis and Characterization of Perfluorooctanoic Acid Anionic Surfactant Doped Nanosize Polyaniline

Nanostructured Polyaniline: An Efficient Support Matrix for Platinum‐Ruthenium Anode Catalyst in Direct Methanol Fuel Cell

Reversible Deactivation of Enzymes by Redox‐Responsive Nanogel Carriers

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