Dispersion of denatured carbon nanotubes by using a dimethylformamide solution

Nguyen, Thi Thuy; Nguyen, Sy Uan; Phuong, Dinh Tam; Nguyen, Duc Chien; Tuan, Anh

doi:10.1088/2043-6262/2/3/035015

Cited by 44 publications

(36 citation statements)

References 22 publications

(24 reference statements)

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“…12 shows UV-vis spectrum of colloidal MWCNTs indicating a maximum absorption at 260 nm; i.e. a good dispersion of MWCNTs in DMF [15]. The absorption peak at 650 nm is assigned to the first Van Hove metallic transition of MWCNTs.…”

Section: Resultsmentioning

confidence: 96%

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Effect of multiwalled carbon nanotubes incorporation on the performance of porous silicon photodetector

Ismail

Kadhim

Abdulridha

2016

Optik

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Section: Resultsmentioning

confidence: 96%

“…In addition, they indicate the occurrence of carbon nanotubes denaturation; i.e. a modification in the surface atoms as well as in the nature of the functional groups [15].…”

Section: Resultsmentioning

confidence: 99%

Effect of multiwalled carbon nanotubes incorporation on the performance of porous silicon photodetector

Ismail

Kadhim

Abdulridha

2016

Optik

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“…CNTs are disaggregated by a) mechanical -ball milling and high shear mixing; and b) chemical methods -altering the surface energy physically (non-covalent treatment) and chemically (covalent treatment) [57]. The behaviour of CNTs in different dispersants has been demonstrated in the literature [56][57][58][59]. The dispersion process is simple and can be accomplished by adding CNTs in dispersants and sonicating the solution for a desired time.…”

Section: Stage Ii: Dispersion Of Cntsmentioning

confidence: 99%

“…DMF and SDS were chosen for dispersion of CNTs in this work, since previously work is available. Although dispersing CNTs by using various surfactants and dispersants has been extensively investigated in the literature [56][57][58][59][60][61][62][63][64][65][66], the applications of previous work require extensive care to ensure that sufficient dispersal of CNTs is achieved.…”

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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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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“…These augmented stable polymeric dispersions have applications in pigments of ink-jet printers [18,19]. Generally, the surfactants used for preparing stable dispersions of carbon powder particles are poly-dimethylsiloxane [20], Orotan® -a polyacrylate [21], sodium dodecylbenzenesulfonate, DMF 2 [22], sodium dodecyl sulphate [23][24][25]. Generally, CB as well as Graphite easily agglomerate in hydrophilic solvents and liquid media not having right range of cohesive energies, due to their inherent hydrophobic nature.…”

Section: Introductionmentioning

confidence: 99%