pH responsive MWCNT–star terpolymer nanohybrids

Iatridi, Zacharoula; Tsitsilianis, Constantinos

doi:10.1039/c2sm27211c

Cited by 33 publications

(26 citation statements)

References 94 publications

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“…Iatridi and Tsitsilianis reported the use of a heteroarm CCS terpolymer consisting of (polystyrene) 22 (poly(2‐vinylpyridine)‐ b ‐poly(acrylic acid)) 22 (PS 22 (P2VP‐ b ‐PAA) 22 ) to disperse multiwalled carbon nanotubes (MWCNTs) in aqueous media. At pH 2.0, the CCS terpolymer existed in the form of core–shell unimolecular micelles and multicore large‐compound micelles.…”

Section: Applications Of Ccs Polymers As Interfacial Stabilizersmentioning

confidence: 99%

Emerging Synthetic Strategies for Core Cross‐Linked Star (CCS) Polymers and Applications as Interfacial Stabilizers: Bridging Linear Polymers and Nanoparticles

Chen

Cao

et al. 2013

Macromol. Rapid Commun.

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Core cross-linked star (CCS) polymers become increasingly important in polymer science and are evaluated in many value-added applications. However, limitations exist to varied degrees for different synthetic methods. It is clear that improvement in synthetic efficiency is fundamental in driving this field moving even further. Here, the most recent advances are highlighted in synthetic strategies, including cross-linking with cross-linkers of low solubility, polymerization-induced self-assembly in aqueous-based heterogeneous media, and cross-linking via dynamic covalent bonds. The understanding of CCS polymers is also further refined to advocate their role as an intermediate between linear polymers and polymeric nanoparticles, and their use as interfacial stabilizers is rationalized within this context.

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Section: Applications Of Ccs Polymers As Interfacial Stabilizersmentioning

confidence: 99%

Emerging Synthetic Strategies for Core Cross‐Linked Star (CCS) Polymers and Applications as Interfacial Stabilizers: Bridging Linear Polymers and Nanoparticles

Chen

Cao

et al. 2013

Macromol. Rapid Commun.

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“…Secondly, the poor solubility and conjugated nature of PEDOT imparted effective physisorption between the stabilizer and the conjugated structure of the nanotube. Thirdly, thanks to the tentacles of multiarm SQ-based copolymers with rigid arms, the solvation segments would produce more opportunities to generate a great affinity for solvent, which primarily decreased the interfacial tension of nanotubes by minimizing their contacts with water [28], and more hydrophobic segments could provide more opportunities to interact with the nanotube surface. This speculation can be strongly supported by the fact that the SQ-based star copolymer employing multi-PEDOT chains compared to its linear analogs resulted in an improved functional capability to stabilize SWNTs.…”

Section: Visual Sedimentation It Was Well Known That Pristinementioning

confidence: 99%

Silsesquioxane-Polythiophene Hybrid Copolymer as an Efficient Modifier for Single-Walled Carbon Nanotubes

Gao

Zhang

et al. 2020

International Journal of Polymer Science

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One silsesquioxane-polythiophene hybrid copolymer, with combined star-like structure and intramolecular heterogeneity, was synthesized and sufficiently characterized via various methods, including FTIR, NMR, and SEC measurements. According to the exploration and characterization results, it was much more efficient at modifying SWNTs than its linear analogs in aqueous solution. The hydrophobic silsesquioxane core and PEDOT chains could locally anchor to the surface of the nanotubes, while the soluble flexible copolymer chains extended into the solution and rigid conjugated chains provided some π-π stacking effect to enhance adhesive force with the conjugated structure of the carbon nanotube, imparting steric stabilization to nanotube dispersion. The noncovalent interaction with SWNTs and solubility in aqueous solution improved the electrochemical characteristics of the modified-SWNT composite and availed for the preparation of a flexible and transparent electroactive film. Accordingly, this kind of silsesquioxane-polythiophene hybrid copolymer will be forwarded to apply to the assembling of flexible optoelectronic devices.

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“…This principle would exclude selection of the following as ANHs; (i) NMs and NHs with coatings that are not stimuli responsive (e.g., NHs comprised of dihydroxotin(IV) porphyrin-functionalized single-walled carbon nanotubes (SWNTs) [ 7 ], NHs composed of quantum dots (QDs) and cytochrome P450 [ 5 ] and NHs containing carbon nanotubes (CNTs) and CdSe QDs [ 8 ]); (ii) that are not covalently bound (e.g., QDs coated with thermo-responsive [ 55 ] or pH-responsive polymers [ 56 ] by simple ligand exchange methods); and (iii) those that will detach from the NM surfaces upon environmental contact (e.g., NHs of a poly(styrene) (PS) core and a multi-armed pH-responsive weak polyampholytic poly(2-vinylpyridine)- b -poly(acrylic acid) diblock copolymer [ 57 ] or at mesoporous silica nanoparticles (MSNPs) capped with poly(propylene imine) dendrimers through reducible disulfide bonds that enable detachment upon stimulus [ 58 ]). This principle will facilitate the identification of ANHs for nano-EHS evaluation.…”

Section: Principle For Discerning Anhsmentioning

confidence: 99%

Dynamism of Stimuli-Responsive Nanohybrids: Environmental Implications

et al. 2015

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Nanomaterial science and design have shifted from generating single passive nanoparticles to more complex and adaptive multi-component nanohybrids. These adaptive nanohybrids (ANHs) are designed to simultaneously perform multiple functions, while actively responding to the surrounding environment. ANHs are engineered for use as drug delivery carriers, in tissue-engineered templates and scaffolds, adaptive clothing, smart surface coatings, electrical switches and in platforms for diversified functional applications. Such ANHs are composed of carbonaceous, metallic or polymeric materials with stimuli-responsive soft-layer coatings that enable them to perform such switchable functions. Since ANHs are engineered to dynamically transform under different exposure environments, evaluating their environmental behavior will likely require new approaches. Literature on polymer science has established a knowledge core on stimuli-responsive materials. However, translation of such knowledge to environmental health and safety (EHS) of these ANHs has not yet been realized. It is critical to investigate and categorize the potential hazards of ANHs, because exposure in an unintended or shifting environment could present uncertainty in EHS. This article presents a perspective on EHS evaluation of ANHs, proposes a principle to facilitate their identification for environmental evaluation, outlines a stimuli-based classification for ANHs and discusses emerging properties and dynamic aspects for systematic EHS evaluation.

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pH responsive MWCNT–star terpolymer nanohybrids

Cited by 33 publications

References 94 publications

Emerging Synthetic Strategies for Core Cross‐Linked Star (CCS) Polymers and Applications as Interfacial Stabilizers: Bridging Linear Polymers and Nanoparticles

Emerging Synthetic Strategies for Core Cross‐Linked Star (CCS) Polymers and Applications as Interfacial Stabilizers: Bridging Linear Polymers and Nanoparticles

Silsesquioxane-Polythiophene Hybrid Copolymer as an Efficient Modifier for Single-Walled Carbon Nanotubes

Dynamism of Stimuli-Responsive Nanohybrids: Environmental Implications

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