The formation of carbon nanotube dispersions by high pressure homogenization and their rapid characterization by analytical centrifuge

Azoubel, Suzanna; Magdassi, Shlomo

doi:10.1016/j.carbon.2010.05.024

Cited by 56 publications

(39 citation statements)

References 35 publications

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“…Stirring represents a simple dispersion technique with poor disentangling and wetting. Ultrasonic treatment and high‐pressure homogenization enhance the deagglomeration substantially but come along with a considerable length degradation. Scalable calendering by three‐roll milling provides sufficient shear forces to break nanotube aggregates and disperse them in epoxy .…”

Section: Introductionmentioning

confidence: 99%

The role of multi-walled carbon nanotubes in epoxy nanocomposites and resin transfer molded glass fiber hybrid composites: Dispersion, local distribution, thermal, and fracture/mechanical properties

et al. 2015

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Hybrid composites containing endless glass fiber reinforcement and surface-functionalized carbon nanotubes (CNTs) dispersed in the matrix phase were produced by resin transfer molding (RTM). An efficient surface modification of the nanotubes enhances the compatibility with the matrix system and the dispersion quality, enabling the impregnation process via liquid composite molding. We assessed the quality of the RTM process by newly developed methodologies for the quantification of the filtering of CNTs. First, we established a method to analyze the CNT length distribution before and after injection for thermosetting composites to characterize length-dependent withholding respectively the size distribution of nanotubes in the hybrid composites. Second, the resulting test laminates were locally examined by Raman spectroscopy and compared to reference (nanocomposite) samples of known CNT content to non-destructively quantify the local CNT concentration along the resin flow path. Moreover, the thermal and mechanical properties of the modified composites were investigated.

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Section: Introductionmentioning

confidence: 99%

The role of multi-walled carbon nanotubes in epoxy nanocomposites and resin transfer molded glass fiber hybrid composites: Dispersion, local distribution, thermal, and fracture/mechanical properties

et al. 2015

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“…8. The absorbance measurements were performed at 500 nm [22,49]. According to our data, at 1 and 1. and 1.5 mM) are just above the critical micelle concentration of the three ionic liquids (CMC is equal to ca.…”

Section: Resultsmentioning

confidence: 99%

Influence of the hydrocarbon chain length of imidazolium-based ionic liquid on the dispersion and stabilization of double-walled carbon nanotubes in water

Raiah

Djalab

Hadj-Ziane-Zafour

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Accelerated quality testing by analytical centrifugation is a promising procedure, as was shown for different types of multiwalled carbon nanotubes (MWCNT) by different research groups. [26,27] Processing and additives were evaluated and optimized based on the transmission pattern and=or the velocity of the clarification=sedimentation during centrifugation. Both fingerprints of the course of the transmission profiles as well as a slower separation velocity indicating a less polydisperse suspension classify a better dispersed material.…”

Section: Mechanical Approachesmentioning

confidence: 99%

Direct and Accelerated Characterization of Formulation Stability

Lerche¹,

Sobisch²

2011

Journal of Dispersion Science and Technology

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Formulation of products as well as process and quality control is in need of fast and efficient measurement techniques of the state of dispersion products. We review the basics of experimental techniques of stability assessment of suspensions and emulsions, procedures of accelerated stability testing, and discuss the relationship between results of ''accelerated'' tests and the outcome under normal conditions of storage and usage (shelf life). Experimental results of the accelerated formulation testing are given with the focus on optical methods measuring stability based on space and time resolved changes of the volume concentration within the entire sample (STEP-Technology). In particular, acceleration of stability assessment acceleration by inclination and analytical centrifugation is demonstrated for diverse types of formulations. If the rate limiting step of destabilization is not sedimentation or creaming a combination with other established aging tests (temperature storage, freeze-thaw-cycles, physicochemical conditions, etc.) is suggested to reduce evaluation time.

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The formation of carbon nanotube dispersions by high pressure homogenization and their rapid characterization by analytical centrifuge

Cited by 56 publications

References 35 publications

The role of multi-walled carbon nanotubes in epoxy nanocomposites and resin transfer molded glass fiber hybrid composites: Dispersion, local distribution, thermal, and fracture/mechanical properties

The role of multi-walled carbon nanotubes in epoxy nanocomposites and resin transfer molded glass fiber hybrid composites: Dispersion, local distribution, thermal, and fracture/mechanical properties

Influence of the hydrocarbon chain length of imidazolium-based ionic liquid on the dispersion and stabilization of double-walled carbon nanotubes in water

Direct and Accelerated Characterization of Formulation Stability

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