van der Waals–London dispersion interactions for optically anisotropic cylinders: Metallic and semiconducting single-wall carbon nanotubes

Rajter, Rick F.; Podgornik, Rudolf; Parsegian, V. Adrian; French, Roger H.; Ching, W. Y.

doi:10.1103/physrevb.76.045417

Cited by 65 publications

(116 citation statements)

References 26 publications

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“…49,50 The Hamaker coefficients we compute here, A 0 = 194 zJ for semi-semi and A 0 = 157 zJ for metal-metal (300 K), are more than a factor of 2 larger than the near-field results computed in Ref. [27] for the (6,5) semiconducting and (9, 3) metallic nanotubes. The major difference is the use of water as the intervening medium in Ref.…”

Section: Results and Discussion A Hamaker Coefficients And Pairmentioning

confidence: 67%

“…in the limit that the substrate is optically isotropic or non-birefringent. 27 The relevant expression for the potential is…”

Section: Methodsmentioning

confidence: 99%

“…The scope of the work presented in Ref. [27] is ambitious, in that it employs a first-principles ab initio scheme to compute the band structure of distinct chiral species. There are, however, some subtle but important issues that are not fully resolved by a purely theoretical approach.…”

Section: Introductionmentioning

confidence: 99%

“…26 The Lifshitz framework of vdW interactions has recently been cast in a form that can be readily applied to SWCNTs. 27 Building on the extensive work of French 28 and Parsegian, 29 Rajter et. al., 27 have developed a formalism that offers considerable insight into the nature of vdW interactions in nanotubes.…”

Section: Introductionmentioning

confidence: 99%

“…27 Building on the extensive work of French 28 and Parsegian, 29 Rajter et. al., 27 have developed a formalism that offers considerable insight into the nature of vdW interactions in nanotubes. The scope of the work presented in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Empirical evaluation of attractive van der Waals potentials for type-purified single-walled carbon nanotubes

et al. 2012

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Van der Waals forces play a critical role in the structure and stability of single-wall carbon nanotube (SWCNT) materials. Thin films assembled from SWCNTs purified by electronic type show particular promise for flexible electronics applications, but mechanical durability remains an unresolved issue. Using transition resonances determined from spectroscopic measurements of typepurified SWCNTs deposited on quartz, coupled with analogous spectroscopic characterization of polydimethylsiloxane (PDMS) substrates, we use the Lifshitz theory of van der Waals dispersion interactions developed by Rajter and co-workers [R. F. Rajter et. al., Phys. Rev. B 76, 045417 (2007)] to examine the influence of electronic type on van der Waals contact potentials in polymer supported nanotube networks. Our results suggest a significantly stronger nanotube-nanotube and nanotube-polymer attraction for the semiconducting SWCNT fractions, consistent with recent measurements of the electronic durability of flexible transparent SWCNT coatings.PACS numbers: 61.48. De, 78.67.Ch, 82.35.Np, 78.20.Bh 2 I. INTRODUCTIONVan der Waals (vdW) forces play a significant role in the structural stability of matter across a broad range of chemistry, physics, and biology. 1-6 They also play a particularly important role in nanotechnology, where they dominate the short-range attraction between nanoparticles and can hinder their dispersion and manipulation. [7][8][9][10][11] For particles lacking a permanent dipole moment, vdW dispersion forces arise solely from small fluctuations in the electromagnetic field -or more precisely, the dielectric permittivity -across the space between the particles, 12,13 which is dominated by the zero-point energy of quantum vacuum fluctuations. The quantum-field nature of such a mundane, ubiquitous and sometimes macroscopic force is quite remarkable, if on occasion not fully appreciated.Single-wall carbon nanotubes (SWCNTs) are nanometer thick tubes of graphene 100 nm to 100 µm in length. They can be either metallic or semiconducting, depending on the chiral vector (n, m) that characterizes the symmetry of rolling a 2D graphene sheet into a hollow tube. 14 They are one of the most studied materials within the realm of modern nanotechnology, with exceptional physical properties that herald the possibility of significant technological potential. 15 The importance of vdW forces in SWCNT materials cannot be overstated. The high aspect ratio and strong anisotropy create potential wells thousands of k B T in depth, but SWCNTs have yet to realize their full potential as mechanical reinforcing agents. This is primarily due to the mechanical failure of interfacial contacts, which are largely governed by vdW forces. Although chemical crosslinking can help mitigate such effects, this often occurs at the expense of the intrinsic SWCNT properties of interest, 16 which can limit the potential impact of applications.Raw nanotube materials typically contain a broad distribution of lengths and a mixture of the two distinct electronic species...

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Section: Results and Discussion A Hamaker Coefficients And Pairmentioning

confidence: 67%

“…in the limit that the substrate is optically isotropic or non-birefringent. 27 The relevant expression for the potential is…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Empirical evaluation of attractive van der Waals potentials for type-purified single-walled carbon nanotubes

et al. 2012

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Microtribology of Aqueous Carbon Nanotube Dispersions

Kristiansen

Zeng

Wang

et al. 2011

Adv Funct Materials

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The tribological behavior of carbon nanotubes (CNTs) in aqueous humic acid (HA) solutions was studied using a surface forces apparatus (SFA) and shows promising lubricant additive properties. Adding CNTs to the solution changes the friction forces between two mica surfaces from “adhesion controlled” to “load controlled” friction. The coefficient of friction with either single‐walled (SW) or multi‐walled (MW) CNT dispersions is in the range 0.30–0.55 and is independent of the load and sliding velocity. More importantly, lateral sliding promotes a redistribution or accumulation, rather than squeezing out, of nanotubes between the surfaces. This accumulation reduced the adhesion between the surfaces (which generally causes wear/damage of the surfaces), and no wear or damage was observed during continuous shearing experiments that lasted several hours even under high loads (pressures ∼10 MPa). The frictional properties can be understood in terms of the Cobblestone Model where the friction force is related to the fraction of the adhesion energy dissipated during impacts of the nanoparticles. We also develop a simple generic model based on the van der Waals interactions between particles and surfaces to determine the relation between the dimensions of nanoparticles and their tribological properties when used as additives in oil‐ or water‐based lubricants.

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Directed and On‐Demand Alignment of Carbon Nanotube: A Review toward 3D Printing of Electronics

Goh

Agarwala

Yeong

2019

Adv Materials Inter

123

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Carbon nanotubes (CNTs) are 1D nanostructured materials with unique mechanical, optical, and electrical properties which can be potentially exploited for fabricating wide variety of devices. In addition, the biocompatibility of CNTs makes it attractive for wearable and implantable technology applications. Well‐aligned CNT structures show enhanced properties such as superior electron mobility, strain sensitivity, better mechanical property, and enhanced performance and reproducibility that are absent in their disordered counterparts, thus allowing more promising applications in various fields. With aligned CNTs, devices can be optimized to exhibit better performance with lesser materials and more miniature designs. This review summarizes the landscape of CNTs alignment, either during the growth or post‐growth processing. This paper delineates various CNTs alignment mechanism, process parameters, and challenges of each technique. A comparative discussion on the advantages, disadvantages, and degree of alignment of each technique is presented. A detailed discussion on the various applications that utilize properties of aligned CNTs devices is presented. The advent of 3D printing techniques for printing CNTs for novel and futuristic applications is also discussed.

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van der Waals–London dispersion interactions for optically anisotropic cylinders: Metallic and semiconducting single-wall carbon nanotubes

Cited by 65 publications

References 26 publications

Empirical evaluation of attractive van der Waals potentials for type-purified single-walled carbon nanotubes

Empirical evaluation of attractive van der Waals potentials for type-purified single-walled carbon nanotubes

Microtribology of Aqueous Carbon Nanotube Dispersions

Directed and On‐Demand Alignment of Carbon Nanotube: A Review toward 3D Printing of Electronics

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