Electric Field-Assisted Processing of Anisotropic Polymer Nanocomposites

Banda, Sumanth; Ounaies, Zoubeida

doi:10.1115/imece2007-44017

Cited by 3 publications

(2 citation statements)

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“…This implies that there is at least one conductive path of connected SWNTs in the nanocomposite film through which electric charge can flow [12]. It is possible due to the high aspect ratio, high specific surface area, and conducting properties of CNTs [25][26][27]. In section 3, a comparative study of the three electrical dynamic AFM techniques is performed on films with 1 wt% of SWNTs.…”

Section: Polyimide Nanocomposite Filmsmentioning

confidence: 99%

Sub-surface imaging of carbon nanotube–polymer composites using dynamic AFM methods

et al. 2013

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High-resolution sub-surface imaging of carbon nanotube (CNT) networks within polymer nanocomposites is demonstrated through electrical characterization techniques based on dynamic atomic force microscopy (AFM). We compare three techniques implemented in the single-pass configuration: DC-biased amplitude modulated AFM (AM-AFM), electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM) in terms of the physics of sub-surface image formation and experimental robustness. The methods were applied to study the dispersion of sub-surface networks of single-walled nanotubes (SWNTs) in a polyimide (PI) matrix. We conclude that among these methods, the KPFM channel, which measures the capacitance gradient (∂C/∂d) at the second harmonic of electrical excitation, is the best channel to obtain high-contrast images of the CNT network embedded in the polymer matrix, without the influence of surface conditions. Additionally, we propose an analysis of the ∂C/∂d images as a tool to characterize the dispersion and connectivity of the CNTs. Through the analysis we demonstrate that these AFM-based sub-surface methods probe sufficiently deep within the SWNT composites, to resolve clustered networks that likely play a role in conductivity percolation. This opens up the possibility of dynamic AFM-based characterization of sub-surface dispersion and connectivity in nanostructured composites, two critical parameters for nanocomposite applications in sensors and energy storage devices.

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Section: Polyimide Nanocomposite Filmsmentioning

confidence: 99%

Sub-surface imaging of carbon nanotube–polymer composites using dynamic AFM methods

et al. 2013

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“…Graphene based materials can play an effective role as efficient nanofillers for the intended tasks only through an efficient dispersion [11,12] of them in the composite, and thus it is substantial to prevent them from forming aggregates. Any operational method to reach a homogeneous and regular particle distribution with improved direction dependent properties in nanocomposites must succeed in both arrangement and orientation of the filler particles in the matrix [3,13].…”

Section: Introductionmentioning

confidence: 99%

Electric field induced alignment of graphene oxide nanoplatelets in polyethersulfone matrix

et al. 2020

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In recent years, in order to obtain improved mechanical, thermal, electrical and barrier/transport properties, aligned carbonaceous nanomaterials/polymer nanocomposite films have been receiving growing attention. Correspondingly, the edge oxidized graphene oxide (EOGO) nanoplatelets alignment influence on the structure of the polyethersulfone (PES) membrane films for potential applications in water treatment field has been investigated. Aligned GO/PES nanocomposite membrane films were prepared by non-solvent phase inversion technique after the starting sol phase was preliminarily exposed to high electric fields (50 kV m−1). Either AC (100, 1000 Hz) or DC mode electric fields were alternatively employed, and the results from both vertical and horizontal field configurations were investigated for structural and morphological comparison. Both XRD, FTIR-ATR, EIS, SEM, TEM and tensile strength analyses were applied in order to characterize the films. The microscopic analyses results have demonstrated successful GO/PES nanocomposite formation and alignment of GO nanoplatelets with the field direction in the matrix at low to moderate (0.02–0.1% wt) GO loadings where the flakes were dispersed and exfoliated sufficiently. However, at higher loading levels (1 and 2% wt) the nanoplateles were mostly agglomerated and the big flakes consisting of irregular plates could not orient their axis parallel to the electric field at the employed field strengths. The results suggest a more effective role of higher frequencies (1000 Hz versus 100 Hz) electric field for alignment of GO nanoplatelets. Simple tensile tests have also similarly confirmed GO alignment under the electric fields at both low (0.1% wt) and moderately high (0.5% wt) GO contents. The tensile strength improvement of the horizontal field processed PES/GO nanocomposite up to 24% compared to its vertical field processed counterpart could be accounted as a proof of the successful alignment of the nanoplatelets. However, EIS results unveiled that non-solvent phase inversion casting method, in its general form, may not be a suitable method for producing materials with tailored properties, due to its random and uncontrollable pore forming mechanism.

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Investigation of electric field‐aligned edge‐oxidized graphene oxide nanoplatelets in polyethersulfone matrix in terms of pure water permeation and dye rejection

Besharat

Manteghian

Russo

et al. 2020

Polymers for Advanced Techs

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Herein, we have evaluated the impact of orientated edge‐oxidized graphene oxide nanoplatelets (EOGO) in polyether sulfone (PES) membrane on the pure water permeability (PWP) and organic dye molecule rejection values. Aligned PES/EOGO nanocomposite films were prepared through electric field induction. Morphological, structural, and chemical‐physical characterizations including atomic force microscopy, thermogravimetric analysis (TGA), contact angle, zeta potential, porosity, and PWP measurements were carried out. The results revealed successful aligned/oriented PES/EOGO nanocomposite formation at low‐to‐moderate EOGO loadings. Membrane function tests demonstrated an increase in water permeability at higher EOGO contents, up to 0.5 wt%, followed by a decrease at 1 wt% nanoplatelets due to nanoparticles agglomeration. The horizontal electric field (1000 Hz) processed samples indicated lower PWP in comparison with their vertical‐field (34% decrement) and No‐field (29% increment) counterparts as well as a better dye molecule rejection at 0.1 wt%, referring to nanoplatelets successful alignment at this loading level.

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Electric Field-Assisted Processing of Anisotropic Polymer Nanocomposites

Cited by 3 publications

References 0 publications

Sub-surface imaging of carbon nanotube–polymer composites using dynamic AFM methods

Sub-surface imaging of carbon nanotube–polymer composites using dynamic AFM methods

Electric field induced alignment of graphene oxide nanoplatelets in polyethersulfone matrix

Investigation of electric field‐aligned edge‐oxidized graphene oxide nanoplatelets in polyethersulfone matrix in terms of pure water permeation and dye rejection

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