Nanomechanical Properties of Silica-Coated Multiwall Carbon NanotubesPoly(methyl methacrylate) Composites

Olek, M.; Kempa, Krzysztof; Jurga, Stefan; Giersig, Michael

doi:10.1021/la0470784

Cited by 107 publications

(63 citation statements)

References 37 publications

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“…[11][12][13][14][15] The composite modulus along the CNT axis (stiff axis) of well-aligned CNT-polymer composites has not been studied to date. In the most relevant related work, Fang et al [16] used…”

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confidence: 99%

Fabrication and Nanocompression Testing of Aligned Carbon‐Nanotube–Polymer Nanocomposites

et al. 2007

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The exceptional electronic, thermal, and mechanical properties of carbon nanotubes (CNTs) have motivated extensive research on their manufacturing and applications. At bulk scales, there is particular interest in property enhancements by adding CNTs to polymers to make composite materials. Most work on CNT-based composites presented in the literature to date has focused on dispersion of single-or multiwalled CNTs (SWNTs or MWNTs) in the matrix; however, bulk CNTs embedded in a polymeric matrix tend to form aggregates that are not only poorly adhered to the matrix but also concentrate stresses, compromising the effect of the CNTs as reinforcement.[1] On the other hand, establishing order and alignment among CNTs within a composite matrix offers significant further potential to harness the properties of individual CNTs at bulk scales by realizing the anisotropic properties of CNTs in desired directions, and by enabling packing and dispersion of CNTs at much higher volume fractions than in tangled configurations. In this work, CNT-polymer composites are manufactured by wetting as-grown arrays of vertically aligned CNTs rapidly and effectively (lack of voids) using off-the-shelf polymers. The wetting process not only preserves the alignment of the CNTs, but also allows the controlled manufacturing of nanocomposite test structures. Direct characterization of the mechanical properties of the nanocomposite structures is also presented in this work. The mechanical-reinforcement results support the feasibility of using these CNT arrays in large-scale hybrid advanced composite architectures reinforced with aligned CNTs. Such composites will also benefit from multifunctional property (e.g., electrical conductivity) enhancements owing to the aligned CNTs.The mechanical properties (e.g., Young's modulus, hardness) of thin films containing randomly oriented CNTs inside a polymer matrix have been assessed using various techniques, that is, analytical models, [2][3][4][5] standard tension and compression tests, [6][7][8][9][10] and nanoindentation techniques. [11][12][13][14][15] The composite modulus along the CNT axis (stiff axis) of well-aligned CNT-polymer composites has not been studied to date. In the most relevant related work, Fang et al. [16] usedBerkovich nanoindentation to determine the hardness of chemical vapor deposition (CVD)-grown aligned MWNTparylene nanocomposites, but did not report their modulus. Parylene is a gas-phase deposited polymer typically used for electrical isolation. Modulus characterization in the transverse direction (i.e., CNTs aligned perpendicular to the direction of modulus measurement) indirectly inferred from structural tests was reported, with a significant increase (by a factor of 20-30) over the assumed modulus of parylene. Modulus characterization using direct measurement methods, not dependent on structural models, is preferred when available. The present work is the first to characterize the mechanical properties of well-aligned CNT-epoxy nanocomposites along the CNT axis using direct...

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confidence: 99%

Fabrication and Nanocompression Testing of Aligned Carbon‐Nanotube–Polymer Nanocomposites

et al. 2007

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“…Hardness varies from 0.15 to 1.19 GPa and from 0.5 to 2.12 GPa, respectively. Probably, the broad ranges come from a network of rods that are very rigid in tension but flexible in bending, [131] and are probed at the same length scale as the network features.…”

Section: Mechanical Strengthmentioning

confidence: 99%

Carbon Nanotube-Based Thin Films: Synthesis and Properties

Wang¹,

Moriyama²

2011

Carbon Nanotubes - Synthesis, Characterization, Applications

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“…[27][28][29][30] The modi¯cation of MWCNTs with a layer of mesoporous silica shell will not only eliminate undesirable attractive interactions between the nanotubes, but also improve interfacial bonding ability. 31 In addition, compared with traditional mesoporous silica, mesoporous silica modi¯ed MWCNTs would possess advantages including quicker mass transfer and more amounts of functionalized groups introduced into the mesoporous structure due to the mesoporous layer. 32 Generally, particle size of commercial SPE¯ller is in the micrometer.…”

Section: Introductionmentioning

confidence: 99%

Solid-Phase Extraction of Phthalate Esters From Aqueous Samples Using Mesoporous Silica-Coated Multiwalled Carbon Nanotubes and Their Determination by HPLC

Deng

Chen

Jiang

2014

NANO

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We report a novel solid-phase extraction adsorbent for the preconcentration of three phthalate esters (PAEs) from aqueous samples. The material was obtained by modifying multiwalled carbon nanotubes (MWCNTs) with mesoporous silica. The structural characterization of the adsorbent was conducted by Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and N 2 adsorption-desorption measurement, which con¯rmed the successful coating of mesoporous silica on MWCNTs and the adsorbent possessing large surface and porous structure. The e®ects of adsorbent amount, type and volume of eluent and sample pH on extraction e±ciency were optimized. Following extraction, the PAEs were quanti¯ed by high performance liquid chromatography (HPLC). Under optimal conditions, the recoveries ranged from 89.8% to 96.3%. The calibration plot was linear in the 3-1000 ngÁmL À1 concentration range, with correlation coe±cients ranging from 0.9993 to 0.9995. The repeatability of the method, expressed as relative standard deviation (RSD), ranged from 3.8% to 7.7% (for n ¼ 5). Limits of detection (LODs) were between 0.28 ng mL À1 and 0.53 ngÁmL À1 . The relative recoveries (RR) for spiked river water, pond water and tap water samples were in the ranges of 80.9-98.0%, 82.7-96.1% and 88.3-95.5%, respectively. The results showed that the method obviously had a large potential for preconcentration and determination of PAEs in environmental samples.

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Nanomechanical Properties of Silica-Coated Multiwall Carbon NanotubesPoly(methyl methacrylate) Composites

Cited by 107 publications

References 37 publications

Fabrication and Nanocompression Testing of Aligned Carbon‐Nanotube–Polymer Nanocomposites

Fabrication and Nanocompression Testing of Aligned Carbon‐Nanotube–Polymer Nanocomposites

Carbon Nanotube-Based Thin Films: Synthesis and Properties

Solid-Phase Extraction of Phthalate Esters From Aqueous Samples Using Mesoporous Silica-Coated Multiwalled Carbon Nanotubes and Their Determination by HPLC

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