Preparation and chiro‐optical characterization of polyaniline doped with (+) or (−)‐2‐pyrrolidone‐5‐carboxylic acid (PCA)

Dubey, Rama; Dutta, Dhiraj; Shami, T. C.; Rao, K.U. Bhasker

doi:10.1002/chir.20919

Cited by 7 publications

(5 citation statements)

References 50 publications

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“…Polyaniline (PANI)-coated HPMs were prepared by using a process similar to the already reported process for polyaniline coating on an HPM surface. , PMMA microspheres obtained above were suspended in the polymerizing mixture used for polyaniline synthesis for coating. The Schematic diagram for preparation of (a) PMMA and (b) PANI-coated PMMA microspheresis shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

Smart pH-Responsive Polyaniline-Coated Hollow Polymethylmethacrylate Microspheres: A Potential pH Neutralizer for Water Purification Systems

2021

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Smart materials with potential pH controllability are gaining widespread concern due to their versatile applicability in water purification systems. A study presented here demonstrates a successful synthesis of smart pH-responsive polyaniline (PANI)-coated hollow polymethylmethacrylate microspheres (PHPMs) using a combination of solvent evaporation and in situ coating techniques. The material was characterized by using conventional techniques. Images recorded by an optical microscope displayed clear evidence in support of the coating, which was further supported by the SEM images. Surface roughness due to the coating was distinct in the SEM images. The PANI coating has enabled the microsphere to effectively neutralize the pH of water in water purification systems, which is very important in tackling the excessive acidic or basic problem of water resources. This study introduces a simple, facile, and cost-effective synthetic route to develop polyaniline-coated hollow polymethylmethacrylate microspheres with high performance as a pH-responsive material for water purification. The low density of the material and relatively large surface area compared to conventionally used chemicals further enhance the application prospect of the material.

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Section: Methodsmentioning

confidence: 99%

Smart pH-Responsive Polyaniline-Coated Hollow Polymethylmethacrylate Microspheres: A Potential pH Neutralizer for Water Purification Systems

2021

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“…Unsubstituted poly(aniline) (PANI) and derivatives are the most studied materials in this field. 58,[62][63][64][65][66][67][68][69][70][71][72][73]59,[74][75][76][77][78][79][80][81][82][83][84][85][86][87][88] Their emeraldine base (dark green) is typically doped with the chiral (S)-or (R)-75 camphor sulfonic acid ((S)-or (R)-12) to the corresponding optically active emeraldine salt (blue) (). 58,63,65,66,68,69,72,73,59,[74][75][76][77][78][79][80][81][82][83][84][85][86]…”

Section: Chirality By Chiral Interaction With the Main Chainmentioning

confidence: 99%

“…to synthesize chiral nanotubes of PANI. 70,71,80 Since the doping/dedoping of PANI is simple acid/base 75 chemistry, dopants are easily removed with a base. When the chiral, doped PANI-films are dedoped with NH 4 OH, the chirality remains despite the chiral counter ions are removed.…”

Section: Chirality By Chiral Interaction With the Main Chainmentioning

confidence: 99%

Chirality in conjugated polymers: when two components meet

Verswyvel¹,

Koeckelberghs²

2012

Polym. Chem.

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Chirality is a well-studied feature in the auspicious class of conjugated polymers. Proper use allows to study and to control the behavior of the polymers which make them very valuable in many applications. Mostly chiral homopolymers are considered, but what happens when the chirality originates from the interplay between multiple components? This review summarizes different approaches for multicomponent chirality in conjugated polymers and properties of them. 55 Interestingly, chirality can also be incorporated in multicomponent systems, in which one or more components are chiral. The presence of different component(s) can influence the macro-and supramolecular structure, giving rise to unprecedented chiral behavior. In this review chiral conjugated 60 polymers in 'multicomponent systems' will be discussed. More in particular, we will deal with conjugated random copolymers, conjugated block copolymers and (achiral) conjugated polymers in the presence of chiral additive or media. Michiel Verswyvel Michiel Verswyvel is a 3 rd year PhDstudent, fellow of FWO-Vlaanderen, affiliated with the Laboratory of Polymer Synthesis at the University of Leuven in Belgium. At the same university, he received his Bachelor (2007) and Master (2009) degree. His research interests include the synthesis and characterization of conjugated block polymers. Guy Koeckelberghs Guy Koeckelberghs is assistant professor at the KU Leuven. He received his PhD in 2002 at KU Leuven on the synthesis of chiral polymers for nonlinear optical applications in the group of Prof. C. Samyn. His research interests are the synthesis and chiroptical properties of allconjugated block copolymers and the magnetic and nonlinear optical properties of conjugated polymers.

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“…It is obvious that this approach can be enhanced when using biologically active substances with acidic functionalities as dopants. However, typically, these substances are weak acids and, at quite high concentrations of >0.5 M (e.g., tartaric acids) or even ≥5 M (e.g., pyroglutamic acid), are unable to completely dope the dedoped PANI dissolved in N -methylpyrrolidone (NMP), DMF, or DMSO. Moreover, the optically active aminosulfonic acid containing simultaneously acidic and amino functional groups appeared to be unable to dope emeraldine base (EB) dissolved in NMP or DMF that was presumably explained by formation of the zwitterion .…”

Section: Introductionmentioning

confidence: 99%

Polyaniline Doping by α,α-Difluoro-β-amino Acids

et al. 2019

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Currently, polyaniline (PANI) is considered as a promising polymer that can be used in biosensors, drug delivery systems, bioelectronics, etc. Its biocompatibility can be strongly improved by using dopants with biofunctionality. This study reveals the protonation/doping of PANI by fluorinated analogs of natural amino acids, namely, α,α-difluoro-β-amino acids (DFAAs) with alkyl and aromatic tails in N -methylpyrrolidone solutions. We find that these acids can dope PANI due to both the weakened basicity of their amino groups because of two fluorine atoms in α,α-positions and specific intermolecular interactions (π–π stacking, alkyl−π, F−π) of their tails with units of PANI chains. These interactions did not give the doped PANI salts with high conductivity but led to formation of stable PANI-DFAA complexes, which were confirmed both by clear changes in the UV–Vis and Fourier transform infrared spectra of the protonated/doped PANI and by their conductivity of ∼10 –6 S/cm. Our results suggest an applicability of such PANI complexes as carriers of DFAA for their biomedical applications.

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Preparation and chiro‐optical characterization of polyaniline doped with (+) or (−)‐2‐pyrrolidone‐5‐carboxylic acid (PCA)

Cited by 7 publications

References 50 publications

Smart pH-Responsive Polyaniline-Coated Hollow Polymethylmethacrylate Microspheres: A Potential pH Neutralizer for Water Purification Systems

Smart pH-Responsive Polyaniline-Coated Hollow Polymethylmethacrylate Microspheres: A Potential pH Neutralizer for Water Purification Systems

Chirality in conjugated polymers: when two components meet

Polyaniline Doping by α,α-Difluoro-β-amino Acids

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