Mixed surfactant system for stable suspension of multiwalled carbon nanotubes

Madni, Imtiaz; Hwang, Chi-Yong; Park, Seong-Dae; Choa, Yong‐Ho; Kim, Hee-Taik

doi:10.1016/j.colsurfa.2010.01.030

Cited by 132 publications

(60 citation statements)

References 24 publications

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“…On the other hand, a SDS concentration of 0.20 mg/mL ( Figure 5(b)) showed the best dispersion results, which is in agreement with the UV-Vis analysis. Different authors have previously reported similar results [30].…”

Section: Dispersion Of Cnts Using Different Surfactantssupporting

confidence: 80%

Surfactant Assisted Stabilization of Carbon Nanotubes Synthesized by a Spray Pyrolysis Method

Mendoza-Cachú

Mercado-Zúñiga²,

Rosas

2017

Advances in Condensed Matter Physics

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Surface modification of carbon nanotubes has been an interesting issue from a composites materials point of view. A nanotubes agglomeration has to be avoided to achieve a homogeneous dispersion in a composite matrix. In this research, we report on the synthesis of carbon nanotubes using a variant of the chemical vapor deposition technique known as spray pyrolysis method. X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) studies showed that the synthesized products had an aligned structure with low purity degree, high content of catalyst particles, and a smaller amount of amorphous carbon. A secondary method was applied, which involves an acidic treatment that dissolves contaminant particles to enhance the purity of the nanotubes. Microstructural analysis, which includes XRD and SEM, indicates an effective reduction of impurities. Dispersion of the nanotubes was assessed using different surfactants, such as sodium dodecyl-sulfate (SDS) and ethylenediaminetetraacetic acid (EDTA). Finally, Raman spectroscopy, UV-Vis, and SEM techniques confirm that better results were obtained with EDTA. For EDTA and SDS surfactants, low concentrations of 0.3 mg/mL and 0.2 mg/mL were most efficient, respectively.

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Section: Dispersion Of Cnts Using Different Surfactantssupporting

confidence: 80%

Surfactant Assisted Stabilization of Carbon Nanotubes Synthesized by a Spray Pyrolysis Method

Mendoza-Cachú

Mercado-Zúñiga²,

Rosas

2017

Advances in Condensed Matter Physics

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“…Owing to these properties, they have been widely used in nanoelectronic devices, actuators, air and water filters, chemical sensors, biosensors, drug delivery, phototherapy, etc. [2][3][4]. They can serve as a promising reinforcement phase incorporated into a polymer matrix to prepare high-performance polymer nanocomposites [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Mechanical methods such as ultrasonication and high-shear mixing as well as chemical methods including non-covalent and covalent functionalization were among the commonly used methods to prevent CNTs aggregation and achieve good dispersion in the polymer matrix. enhances the dispersion ability of CNTs in solvents and composites, but can also improve the compatibility of CNTs with the composite matrix [3,12,13]. Ultrasonic irradiation is widely used to dispersing nanoparticles and colloids, functionalization of CNTs and produce nanocomposites, nanomaterials, and nanoforms of chemical compounds [14].…”

Section: Introductionmentioning

confidence: 99%

Efficient surface modification of MWCNTs with vitamin B1 and production of poly(ester-imide)/MWCNTs nanocomposites containing L-phenylalanine moiety: Thermal and microscopic study

Mallakpour

Soltanian²

2016

Express Polym. Lett.

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Abstract.A simple and efficient method was presented for chemical functionalization of multi-walled carbon nanotubes (MWCNTs) with vitamin B 1 . Poly(ester-imide) (PEI) based nanocomposites were prepared by the incorporation of different amounts of modified MWCNTs (5, 10, 15 wt%) into a chiral and biodegradable PEI by solution blending and ultrasonic dispersion methods. The chiral PEI was produced by a step-growth polymerization of chiral diacid with 4,4!-thiobis(2-tertbutyl-5-methylphenol). Spectroscopic and microscopic techniques were used to examine the chemical structure, morphology and thermal stability of the functionalized MWCNTs and the obtained nanocomposites. The microstructure study revealed the homogeneous dispersion of modified MWCNTs throughout the PEI matrix. Thermogravimetric analysis results confirmed that the heat stability of the prepared composites was improved compared to the pure PEI.

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“…No entanto, funcionalizações químicas agressivas causam um aumento nos defeitos nas paredes laterais, o que pode alterar as propriedades mecânicas e elétricas dos CNTs. [7][8][9][10] Uma ampla variedade de surfactantes (aniônico, catiônico e não iônico) tem sido estudada para dispersões de CNTs, como lauril sulfato de sódio (SDS), 11,12 dodecil benzeno sulfato de sódio (SDBS), 13 brometo de cetiltrimetil amônio (CTAB), 14 geralmente é necessária uma alta concentração de surfactantes para se obter dispersões estáveis de CNTs, que é inconveniente devido ao alto custo dos surfactantes, seus impactos ambientais e por restringir o uso destas suspensões em materiais compósitos. 9 Considerando a relevância dos surfactantes nas dispersões de CNTs, o objetivo do presente estudo foi comparar dois surfactantes, SDS e Tween 80, para dispersão de nanotubos através das técnicas de tensão superficial, condutividade, fluorescência e espectroscopia de UV-vis.…”

Section: Introductionunclassified

Estudo das dispersões aquosas de nanotubos de carbono utilizando diferentes surfactantes

2013

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Recebido em 7/12/11; aceito em 9/8/12; publicado na web em 27/11/12 STUDY OF AQUEOUS DISPERSIONS OF CARBON NANOTUBES USING DIFFERENT SURFACTANTS. The dispersion of carbon nanotubes in water for their utilization in nanoscale devices is a challenging task. Comparative studies on interaction and dispersion of multi-wall carbon nanotubes (MWNT) using two different surfactants (sodium dodecyl sulfate, SDS, and polyoxyethylenesorbitanmonooleate, Tween 80) are presented. The interaction between carbon nanotubes and surfactants was studied by tensiometry, conductivimetry, and fluorimetry. The dispersions of MWNT in surfactants were characterized using a UV-vis spectrophotometer. For effective dispersion, the minimum weight ratio of MWNT to surfactant was 1:41 and 1:3 for SDS and Tween 80, respectively.Keywords: carbon nanotube; surfactant; dispersion. INTRODUÇÃOOs nanotubos de carbono (CNTs) foram observados pela primeira vez por Iijima, 1 em 1991, e desde então têm recebido muita atenção devido às suas propriedades físicas exclusivas.2,3 Os CNTs exibem excelentes propriedades mecânica, elétrica, magnética e térmica, diâmetro de escala nanométrica, bem como razão de aspecto alta (~1000) em comparação com os silicatos lamelares (~200), que os tornam um elemento ideal de reforço para compósitos de polímeros. 3,4 Em diversas das suas importantes aplicações, os CNTs somente apresentam suas propriedades únicas se estiverem em uma dispersão altamente homogênea.5 No entanto, CNTs são pouco solúveis na maioria dos solventes. Devido à forte atração de van der Waals, eles exibem uma tendência a se agregarem e formarem grandes agregados de difícil dispersão. 6 No intuito de obter dispersões homogêneas, duas alternativas diferentes estão atualmente sendo utilizadas para dispersar os nanotubos de carbono, por exemplo, métodos mecânicos (físicos) ou métodos químicos. O uso de métodos mecânicos, como ultrassonicação e agitação com alta taxa de cisalhamento, permite a separação dos nanotubos uns dos outros. Além destes métodos fragmentarem os nanotubos durante o processo, causando a diminuição da razão de aspecto, também são métodos ineficientes e consomem tempo e energia elevados. Os métodos químicos usam surfactantes ou modificações químicas para alterar a energia de superfície dos CNTs, melhorando as características de molhabilidade e adesividade, e aumentam a estabilidade da dispersão no solvente. A funcionalização covalente inclui a ligação de diferentes grupos funcionais nas paredes dos nanotubos de carbono. No entanto, funcionalizações químicas agressivas causam um aumento nos defeitos nas paredes laterais, o que pode alterar as propriedades mecânicas e elétricas dos CNTs. geralmente é necessária uma alta concentração de surfactantes para se obter dispersões estáveis de CNTs, que é inconveniente devido ao alto custo dos surfactantes, seus impactos ambientais e por restringir o uso destas suspensões em materiais compósitos. 9Considerando a relevância dos surfactantes nas dispersões de CNTs, o objetivo do presente estudo foi comp...

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Mixed surfactant system for stable suspension of multiwalled carbon nanotubes

Cited by 132 publications

References 24 publications

Surfactant Assisted Stabilization of Carbon Nanotubes Synthesized by a Spray Pyrolysis Method

Surfactant Assisted Stabilization of Carbon Nanotubes Synthesized by a Spray Pyrolysis Method

Efficient surface modification of MWCNTs with vitamin B1 and production of poly(ester-imide)/MWCNTs nanocomposites containing L-phenylalanine moiety: Thermal and microscopic study

Estudo das dispersões aquosas de nanotubos de carbono utilizando diferentes surfactantes

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