Chiral Asymmetry of Helical Polymer Nanowires

Ogunro, Olayinka O.; Karunwi, Olukayode; Khan, Ishrat M.; Wang, Xiaoqian

doi:10.1021/jz9004027

Cited by 10 publications

(10 citation statements)

References 17 publications

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“…Computational results demonstrate that the semi-rigid aromatic polystyrene backbone has certain flexibility to adjust its conformation during successive helical wrapping. [42][43][44][45] The initial sets of calculations were carried out using pristine SWNTs. The same calculation procedure and the parameters have been employed for three conformations (isotactic, atactic, and syndiotactic) of polystyrene-wrapped carbon nanotubes.…”

Section: Resultsmentioning

confidence: 99%

Effect of polymer stereoregularity on polystyrene/single-walled carbon nanotube interactions

et al. 2015

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We use a combination of computational and experimental studies to elucidate the effect of polymer stereoregularity on the capability of polystyrene interacting with single-walled carbon nanotube (SWNT) surfaces. Calculated binding energies on complexes of lightly oxidized SWNT with isotactic and atactic polystyrene favor the former, which suggests that the isotactic polymer interacts more effectively with the SWNT. The glass transition temperature (T g ) of the isotactic polystyrene/SWNT matrix increases from 90.9 to 100.5 o C as the SWNT content is increased to 0.5%, whereas the glass transition temperature of the atactic polystyrene/SWNT matrix is invariant with increasing SWNT content. Rotating frame 13 C T 1ρ relaxation rates for the isotactic polymer/SWNT matrix increases from 2.15 to 2.43 ms as SWNT is increased from 0.25 to 1.0 %. However, the rotating frame 13 C T 1ρ relaxation rates for the atactic polymer/SWNT matrix decreases from 2.50 to 1.60 ms as SWNT is increased from 0.25 to 1.0 %. Our results demonstrate that the SWNT is better dispersed within the isotactic polystyrene and the better dispersion is associated with more effective interaction of isotactic polymer with the SWNT surface.

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Section: Resultsmentioning

confidence: 99%

Effect of polymer stereoregularity on polystyrene/single-walled carbon nanotube interactions

et al. 2015

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“…8 We believe this has to do with the specific size of the SWCNTs. Finally, 1% SWCNT content in the fibers results in fibers which are sufficiently electroactive for our study.…”

Section: Discussionmentioning

confidence: 99%

Procedure for Fabricating Biofunctional Nanofibers

Doss

Olubi

Sannigrahi

et al. 2012

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Electrospinning is an effective processing method for preparing nanofibers decorated with functional groups. Nanofibers decorated with functional groups may be utilized to study material-biomarker interactions i.e. act as biosensors with potential as single molecule detectors. We have developed an effective approach for preparing functional polymers where the functionality has the capacity of specifically binding with a model protein. In our model system, the functional group is 2,4-dinitrophenyl (DNP) and the protein is anti-DNP IgE H NMR and Gel Permeation Chromatography (GPC). The molecular weight distributions of the polymers were narrow (1.1-1.2) and polymers with molecular weights greater than 50,000 was used in this study. The polymers were yellow powders and soluble in tetrahydrofuran. A water soluble CDNP-PEO-P2MS-PEO-CDNP/ DMEG (dimethoxyethylene glycol) complex binds and achieves steady state binding with solution IgE within a few seconds. Higher molecular weight (water insoluble i.e. around 50,000) CDNP-PEO-P2MS-PEO-CDNP polymers, containing 1% single wall carbon nanotubes (SWCNT) were processed into electroactive nanofibers (100 nm to 500 nm in diameter) on silicon substrate. Fluorescence spectroscopy shows that anti-DNP IgE interacts with the nanofibers by binding with the DNP functional groups decorating the fibers. These observations suggest that appropriately functionalized nanofibers hold promise for developing biomarker detection device. Video LinkThe video component of this article can be found at

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“…The blending of polymer assembly and fullerenes C 60 (ref. 3) and carbon nanotube 4 have been also studied by experimental and theoretical methods and access lots of emergent properties.…”

Section: Introductionmentioning

confidence: 99%