Deposition and meniscus alignment of DNA–CNT on a substrate

Khripin, Constantine Y.; Zheng, Ming; Jagota, Anand

doi:10.1016/j.jcis.2008.10.073

Cited by 16 publications

(23 citation statements)

References 39 publications

(98 reference statements)

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“…DNA [18,25], in a process referred as molecular combing. Systematic reorientation of SWNTs by mobile liquid interfaces has been previously reported [19], and more recently, for SWNT-DNA complexes [26]. In these cases, the interface applied in the process was however that of the receding, particle-containing solution, which is in contrast to our case, where the advancing contact line of pure water is utilized.…”

Section: The Surface Tension Force At the Contact Linementioning

confidence: 71%

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

et al. 2016

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Section: The Surface Tension Force At the Contact Linementioning

confidence: 71%

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

et al. 2016

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“…they should be fully hydrophobic and have few ionizable defect sites. Typically, experiments with CNTs at water surfaces have been made on highly defective CVD-grown tubes, and/or include processing steps that renders the tubes defective [8][9][10]. Moreover, the CNTs are commonly made soluble via functionalization of the outer layer, which ensures that those CNTs are very different from ours with respect to surface properties.…”

Section: Discussionmentioning

confidence: 99%

“…Examples are particle separation in mining industries [3], particle transport and trapping in environmental sciences [1], and in the cleaning processes of the microelectronics industry [4][5][6]. These conventional areas of technology are being complemented by the emerging field of nanotechnology, which brings forward new nanoscale particles whose interaction with capillary forces are an important topic as well [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Carbon nanotubes (CNT) offer in principle a magnificent test bed for experimental studies in this field, as they can be inert or functionalized, long or short, flexible or rigid. A few experimental works have been reported that involve in some way CNTs interacting with a liquid contact line [8][9][10], but in all of these the main goal has been something else than research on the issue of CNT interaction with the liquid interface.…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies on the detachment of multi-walled carbon nanotubes by a mobile liquid interface

Hokkanen

Lautala

Flahaut

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. A B S T R A C TRetention and detachment of colloidal particles from surfaces is often considered only in terms of spontaneous chemical dispersion when the surface is already fully submerged. Nevertheless, interfacial processes, where the particles are caught on a mobile liquid contact line by capillary effects are ubiquitous. Theoretical description of such interfacial processes exist for spherical microcolloids, while for anisotropic shapes the literature is limited. Arc-discharge synthesized multiwalled carbon nanotube (MWNT) material contains besides the very anisotropic tubes also irregular amorphous carbon particles (ACP) that both are strongly hydrophobic. As a water-air-solid contact line is swept over a deposition of MWNT material on a hydrophilic substrate, it causes selective detachment of the spherical ACPs over the one dimensional MWNTs. In this work we investigate the detachment process and the balance between the surface tension force and adhesive forces. Our results show that on hydrophilic substrates the surface tension force of the liquid interface dominates over adhesion, sweeping away most of the material. However, clean MWNTs oriented perpendicular to the contact line are able to resist detachment. On the other hand, on hydrophobic surfaces adhesive forces dominate, possibly via the hydrophobic interaction. We discuss these results with conventional models of capillarity and adhesion, including the van der Waals force and the electrostatic double layer interaction. However, a fully satisfactory analysis will require e.g. computational modelling of the problem.

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“…Their AFM results demonstrated that high density arrays of aligned DNA-CNT complexes, produced by long genomic ss-DNA, could be formed at the edges of air-drying droplets on aminopropyltrietoxysilane (APTES)-terminated silicon substrates. Alternatively, deposition and meniscus alignment of DNA-CNT complexes was performed on a silicon wafer coated with an alkyl-silane monolayer, and the effects of pH, ionic strength and time on the density of the deposited DNA-CNTs were studied (Khripin et al, 2009a). Electrochemical oxidative polymerization of ethylenedioxythiophene (EDOT) was used by Bae and coworkers to deposit complexes of ds-DNA-CNTs on indium tin oxide (ITO)…”

Section: Assembly On Solid Substratesmentioning

confidence: 99%

DNA-Wrapped Carbon Nanotubes: From Synthesis to Applications

Sánchez-Pomales¹,

Pagan-Miranda²,

Santiago-Rodríguez³

et al. 2010

Carbon Nanotubes

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Carbon nanotubes (CNTs) have been the focal point of many studies since their discovery two decades ago (Iijima, 1991). They are allotropes of carbon with cylindrical shape and sp 2 hybridization, which are formed by benzene-type hexagonal rings of carbon atoms. CNTs can be classified as either single-walled (SWNTs) or multi-walled carbon nanotubes (MWNTs) depending on their structure. They possess a very high aspect ratio (i.e. length/diameter), with diameters in the range of nanometers and lengths that can reach microns. Additionally, CNTs can be divided according to their conductivity, into metallic or semiconducting tubes. Nanotubes possess outstanding structural, mechanical and electronic properties due to the unique combination of their dimension, structure and topology. For example, CNTs are extremely strong, can be highly conducting, and exhibit high thermal and chemical stability (Mintmire et al., 1993; Mintmire & White, 1998). Also, they are elastic and have many times the tensile strength of steel (Service, 1998). Due to these unique properties, CNTs have been proposed for many applications, ranging from scanning probes (Dai et al., 1996) and hydrogen storage (Dillon et al., 1997), to biosensors (Nguyen et al., 2002). Several methods have been commonly used to synthesize CNTs, including arc discharge, chemical vapor deposition and laser ablation, among others (Ando et al., 2004). After the growth process, CNTs contain impurities such as metal catalyst nanoparticles, amorphous carbon, carbon nanoparticles, and fullerenes, which must be removed. Typical CNTs purification techniques include ultrasonication (Shelimov, et al., 1998), microfiltration (Bandow et al., 1997), chromatographic techniques (Nigoyi et al., 2001), microwave heating (Harutyunyan et al., 2002), gas-phase oxidation (Ebbesen et al., 1994), and acid oxidation (Rinzler et al., 1998). Nevertheless, their purification is not a trivial task, and either improvement on the existing techniques or development of new purification methodologies are required in order to facilitate the use of CNTs and their integration into nanodevices and composite materials. Another main challenge to overcome is the need for the development of new functionalization chemistries that can increase the solubility of CNTs without altering their 35 www.intechopen.com

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Deposition and meniscus alignment of DNA–CNT on a substrate

Cited by 16 publications

References 39 publications

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

On-chip purification via liquid immersion of arc-discharge synthesized multiwalled carbon nanotubes

Experimental studies on the detachment of multi-walled carbon nanotubes by a mobile liquid interface

DNA-Wrapped Carbon Nanotubes: From Synthesis to Applications

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