Stability of multi-walled carbon nanotube+laponite hybrid particles in aqueous suspensions

Manilo, Maryna; Lebovka, Nikolaï; Bárány, Sándor

doi:10.1016/j.colsurfa.2015.04.052

Cited by 15 publications

(9 citation statements)

References 34 publications

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“…This effect is most notably observed when suspended CNTs flocculate and separate from the solvent within minutes to hours of mixing. With continuous efforts on this topic, − there are three main strategies to disperse a CNT in a liquid medium, including (1) dispersing a pristine CNT in neat solvents, (2) utilizing dispersing agents, and (3) modification of CNTs by covalent surface functionalization. − …”

Section: Preparation Of Transparent Cnt Filmsmentioning

confidence: 99%

Recent Development of Carbon Nanotube Transparent Conductive Films

2016

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Transparent conducting films (TCFs) are a critical component in many personal electronic devices. Transparent and conductive doped metal oxides are widely used in industry due to their excellent optoelectronic properties as well as the mature understanding of their production and handling. However, they are not compatible with future flexible electronics developments where large-scale production will likely involve roll-to-roll manufacturing. Recent studies have shown that carbon nanotubes provide unique chemical, physical, and optoelectronic properties, making them an important alternative to doped metal oxides. This Review provides a comprehensive analysis of carbon nanotube transparent conductive films covering detailed fabrication methods including patterning of the films, chemical doping effects, and hybridization with other materials. There is a focus on optoelectronic properties of the films and potential in applications such as photovoltaics, touch panels, liquid crystal displays, and organic light-emitting diodes in conjunction with a critical analysis of both the merits and shortcomings of carbon nanotube transparent conductive films.

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Section: Preparation Of Transparent Cnt Filmsmentioning

confidence: 99%

Recent Development of Carbon Nanotube Transparent Conductive Films

2016

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“…When laponite is added to a solution it reacts with the soluble components in the formulation to develop its viscosity [23]. Laponite products are able to disperse in water [24,25], beside addition of laponite into aqueous solutions considerably prevents aggregation of solid particles and enhances their dispersibility into the solution [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Development of a Homogenous Cement Slurry Using Synthetic Modified Phyllosilicate while Cementing HPHT Wells

Elkatatny

2019

Sustainability

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Cement slurry segregation has a detrimental impact on the cement matrix efficiency in term of zonal isolation. In this study, synthetic modified phyllosilicate (SMP) dispersant, which is known as laponite RD is suggested to reduce the slurry segregation and enhance the vertical homogeneity of the cement matrix in term of density distribution. Seven cement slurries were prepared with different SMP concentrations using molds with different dimensions based on the targeted test, then cured for 24 h at 140 °C and 3000 psi using a high-pressure and high-temperature curing chamber. After that, the samples’ density distribution was evaluated using a direct density measurement and computer tomography (CT) scan imaging technique, and the effect of SMP on the cement rheological parameters, permeability, and compressive strength and were also evaluated. The performance of SMP was then compared with a commercial dispersant. As a result, 0.3% by weight of cement (BWOC) of SMP is found to considerably reduce the vertical density variation along the cement column to 0.46% compared with a density variation of 4.78% for the slurry with the commercial dispersant. The CT scan images confirmed the vertical homogeneity of the slurry with 0.3% BWOC of SMP. Addition of 0.3% BWOC of SMP increased the yield point of the cement slurry to 60.6 MPa compared with 20.5 MPa for the slurry with 0.25% of the commercial dispersant. Adding 0.3% BWOC of SMP into the cement formulation decreased the permeability by 37.1% compared with the commercial dispersant. The sample with 0.3% BWOC of SMP has a compressive strength of 43.9 MPa.

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“…Recently, a new type of hybrid based on MWCNTs covered by platelets of Laponite RD® (Lap) was described [16] [38]). Adhesion of charged Lap nanoparticles on the surface of nanotubes improved their dispersion [10,29,[39][40][41][42][43][44]. Addition of Lap resulted in efficient dispersion of MWCNT aggregates and separation of individual nanotubes (Fig.…”

Section: Fig 6 Adsorption Mechanisms Of Ctab On the Surface Of Carbmentioning

confidence: 99%

“…Stabilization of nanotubes by Lap nanoparticles was explained by formation of the hydrophilic charged shells on the nanotube surface. The presence of Lap shells around the MWCNT surface was recently visualized using high resolution TEM technique [43]. Fig.…”

Section: Fig 6 Adsorption Mechanisms Of Ctab On the Surface Of Carbmentioning

confidence: 99%

A short review on regulation of stability of aqueous suspensions of carbon nanotubes

Manilo¹,

Lebovka²,

Bárány³

2020

Him. Fiz. Tehnol. Poverhni

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This review analyses the authors' recent and related works on electrokinetic properties and colloidal stability of aqueous suspension of multi-walled carbon nanotubes (CNTs) in the presence of surfactants and nanoparticles. Selected adsorptive properties of carbon nanotubes are also considered.The applicability of classical theories of electrophoresis for description of electrophoretic mobility of carbon nanotubes is discussed. Examples on the ζ-potential of CNTs in aqueous suspensions as a function of pH and concentration of electrolytes (KCl, CaCl 2 and AlCl 3 ) are given. Additions of cetyltrimethylammonium bromide (CTAB) cationic surfactant below the critical micelle formation concentration (CMC) values give a reduction and then an overcharging the CNT surface because of accumulation of the surfactant ions in the Stern layer. At concentrations above CMC the substantial drop in ζ-potential is observed. It is due to the shift of the shear plane toward solution as a result of formation of hemi-micelles on the surface. An increase in the mass ratio of artificial mineral Laponite (Lap) in suspension (X) from 0 to 0.4 results in a monotonic decrease of the ζ-potential of CNT + Lap hybrids with reaching its plateau value ≈ -32 mV at X ≥ 0.4 that corresponds to the ζ-potential of "pure" Lap platelets. This evidences the high surface coverage of nanotubes surface with Lap at X ≥ 0.4.The major methods to improve the dispersibility of carbon nanotubes, their colloidal stability and adsorptive properties are briefly discussed, namely: stabilization in mixtures of water and organic solvents; functionalization by chemical treatment; stabilization by additives of surfactants or polymers and hybridization by addition of supplementary stabilizing nanoparticles. CNTs can be significantly debundled in "good" solvents, such as 1cyclohexyl-2-pyrrolidone, N,N-dimethylformamide, or N-methyl-2-pyrrolidone. It is demonstrated that the dispersibility of CNTs is a complex function of the type of surfactant, its concentration and the surfactant/CNTs ratio. The optimum concentration of CTAB to achieve homogeneous aqueous dispersion of carbon nanotubes was identified to be near the CMC. Additions of CTAB significantly modify the size distribution of CNTs and a sharp transition from small primary aggregates to large secondary aggregates at concentrations above CMC is observed. At optimal concentration of Lap the nanotube particles get well stabilized, and a stepwise increase of sedimentation stability is observed.We have shown also that CNT + Lap hybrids can be effectively used for removal of methylene blue dye from aqueous systems. The kinetics and mechanisms of adsorption are elucidated.

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Stability of multi-walled carbon nanotube+laponite hybrid particles in aqueous suspensions

Cited by 15 publications

References 34 publications

Recent Development of Carbon Nanotube Transparent Conductive Films

Recent Development of Carbon Nanotube Transparent Conductive Films

Development of a Homogenous Cement Slurry Using Synthetic Modified Phyllosilicate while Cementing HPHT Wells

A short review on regulation of stability of aqueous suspensions of carbon nanotubes

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