Self-Alignment of Shortened Multiwall Carbon Nanotubes on Polyelectrolyte Layers

Kim, Bumsu; Sigmund, Wolfgang M.

doi:10.1021/la026679x

Cited by 46 publications

(27 citation statements)

References 21 publications

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“…Stage iii: Attachment of the dispersed CNTs on the pre-treated surface Attachment of CNTs on the different surfaces by various methodologies was demonstrated in the literature [45,47,[67][68][69][70][71][72][73][74][75][76][77]. To bond CNTs to rock surface, CNTs are required to be functionalised by carboxylic groups to simplify the procedures.…”

Section: Stage Ii: Dispersion Of Cntsmentioning

confidence: 99%

See 1 more Smart Citation

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Ghorbani¹,

Wilson²,

Kapur³

et al. 2014

SPE International Oilfield Scale Conference and Exhibition

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A new potential application of nanotechnology for mineral scale prevention in the oil and gas industry is presented. In current squeeze treatments, in which scale inhibitors are squeezed into wells to adsorb or precipitate onto rock surfaces for later release, a large proportion of the injected inhibitor does not adsorb and is therefore returned very quickly from the reservoir upon well re-start. Here it is demonstrated that nano-particles have the potential to enhance squeeze lifetime by greatly increasing the adsorption of inhibitors within the formation. An extensive literature review is presented, exploring the potential for using nano-scale materials in squeeze treatments. One of the observations from scale inhibitor squeezes into sandstone reservoirs is the apparent lack of suitable surfaces available for adsorption. The main constituent of sandstones, quartz, has a very low ability to adsorb inhibitor (1 mg/I). Given this, research using nanotechnology was targeted towards enhancing the available sites for scale inhibitor adsorption within the near wellbore. Specifically, research was undertaken to examine the potential benefits of using carbon nanotubes in a process called Nanotechnology Assisted Squeeze Treatment (NAST). The process involves carbon nanotubes adsorbing and permanently modifying the near wellbore with scale inhibitors subsequently adsorbing onto the nanotubes. This process was observed to be significantly higher than a non-modified near wellbore surface, with a maximum adsorption of more than 85 and 160mg/g onto the nanotubes in solution of distilled water (DW) and CaC12 in DW; respectively, compared to 1 mg/g directly onto the rock. Coreflood tests comparing the NAST procedure with a simplified standard coreflood show the potential for improvement of the squeeze lifetime. IntroductionInorganic scale precipitation, including formation of CaCO 3 , MgCO 3 , FeCO 3 , BaSO 4 , CaSO 4 , SrSO 4 , etc. occurs when two incompatible brines are mixed or where the conditions (i.e. temperature and pressure) in a system are changed and there is a resulting change in the solubility of certain salts. This can cause blockage of the oil path and damage to the production system. A chemical squeeze treatment is used to pump scale inhibitor (SI) downhole to adsorb or precipitate onto the formation rock. The aim is to establish a downhole reserve of SI from which subsequent desorption or release maintains a concentration of SI within the reservoir sufficient to prevent scale formation. The lifetime of the squeeze treatment is defined as the time when the return Scale Inhibitor (SI) concentration falls below the Minimum Inhibitor Concentration (MIC), which is typically 1-20 ppm depending on the reservoir conditions and SI properties. At this point the well needs to be re-squeezed. Regardless of whether the SI adsorbs or precipitates, the squeeze treatment process is expensive due to the squeeze implementation, chemical inhibitor costs and most importantly because of production losses/deferred during th...

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Section: Stage Ii: Dispersion Of Cntsmentioning

confidence: 99%

“…To bond CNTs to rock surface, CNTs are required to be functionalised by carboxylic groups to simplify the procedures. COOH-CNTs are produced by acidifying the CNTs in the solution of sulphuric and nitric acids [69][70][71][72][73]. Carboxylic groups of CNTs react with amine groups of organosilane treated on the surface.…”

Section: Stage Ii: Dispersion Of Cntsmentioning

confidence: 99%

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Ghorbani¹,

Wilson²,

Kapur³

et al. 2014

SPE International Oilfield Scale Conference and Exhibition

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“…Liu et al developed a self-assembled SWNT alignment method under room temperature, which was much easier to implement compared with Dai and Wang's approaches requiring high temperature (Liu 2000). Derivative CNT alignment approaches have been reported (Chattopadhyay et al, 2001;Kim & Sigmund 2003).…”

Section: Immobilization Of Aligned Cntsmentioning

confidence: 99%

Surface Modification Approaches for Electrochemical Biosensors

Shi¹,

Porterfield²

2011

Biosensors - Emerging Materials and Applications

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“…Poly (diallyldimethylammonium chloride) (PDDA), a water soluble cationic polyelectrolyte, can improve the dispersibility of MWCNTs in water and form the thin films of MWCNTs for various applications [36][37][38][39][40]. Additionally, PDDA has excellent binding capability with graphene, could maintain the electronic structure of graphene and increase the solubility of graphene [41,42].…”

Section: Introductionmentioning

confidence: 99%

Acetylcholinesterase Biosensor Based on Poly (diallyldimethylammonium chloride)-multi-walled Carbon Nanotubes-graphene Hybrid Film

et al. 2013

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Abstract:In this paper, an amperometric acetylcholinesterase (AChE) biosensor for quantitative determination of carbaryl was developed. Firstly, the poly (diallyldimethy-lammonium chloride) -multi-walled carbon nanotubes-graphene hybrid film was modified onto the glassy carbon electrode (GCE) surface, then AChE was immobilized onto the modified GCE to fabricate the AChE biosensor. The morphologies and electrochemistry properties of the prepared AChE biosensor were investigated by using scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. All variables involved in the preparation process and analytical performance of the biosensor were optimized. Based on the inhibition of pesticides on the AChE activity, using carbaryl as model compounds, the biosensor exhibited low detection limit, good reproducibility and high stability in a wide range. Moreover, the biosensor can also be used for direct analysis of practical samples, which would provide a new promising tool for pesticide residues analysis.

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Self-Alignment of Shortened Multiwall Carbon Nanotubes on Polyelectrolyte Layers

Cited by 46 publications

References 21 publications

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Surface Modification Approaches for Electrochemical Biosensors

Acetylcholinesterase Biosensor Based on Poly (diallyldimethylammonium chloride)-multi-walled Carbon Nanotubes-graphene Hybrid Film

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