Scalable production of high-quality carbon nanotube dispersion in aqueous solution using cellulose as dispersant by a freezing/thawing process

Qiao, Liangzhi; Du, Kaifeng

doi:10.1016/j.jcis.2022.05.041

Cited by 10 publications

(3 citation statements)

References 52 publications

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“…17 In order to solve the problem, various CNT dispersion approaches have been proposed and tested, including mechanical method, covalent and non-covalent functionalizations. 9,[18][19][20] Unfortunately, the mechanical method may lead to the breakup of CNT under the extremely high shear stress. 21 Chemical modifications, such as acid oxidation and free radical reaction, partially destroy the π-electronic conjugation structure of CNT.…”

Section: Introductionmentioning

confidence: 99%

“…However, CNT generally forms bundled structures and causes a phase separation in polymer matrix because of the strong van der Waals interactions, 14–16 which is likely to deteriorate the properties of CNT‐based composites 17 . In order to solve the problem, various CNT dispersion approaches have been proposed and tested, including mechanical method, covalent and non‐covalent functionalizations 9,18–20 . Unfortunately, the mechanical method may lead to the breakup of CNT under the extremely high shear stress 21 .…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of polyetherimide fibers based on the synergistic effect of carbon nanotubes and ionic liquids

Ke,

Yang,

Zhang

et al. 2023

Polymer Composites

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Polyetherimide (PEI) has been widely applied in the form of plastics, films, and foam materials. But PEI fiber is confronted with some challenges, such as high melt viscosity and high spinning temperature during the spinning process, poor mechanical properties because of its amorphous structure. In this study, ionic liquids (ILs) and carbon nanotubes (CNTs) were used to prepare PEI composite fibers (PEI/CNT‐IL) successfully, which were further characterized by scanning electron microscope (SEM), Raman spectra, differential scanning calorimetry, dynamic mechanical analysis, thermalgravimetric analysis, mechanical property, and conductivity measurements. IL showed a plasticizing effect to reduce the processing temperature of PEI and SEM images showed that CNTs were uniformly dispersed in the PEI matrix by the assistance of IL. The synergistic effect of CNT and IL thus improved the tensile strength and antistatic properties of PEI fibers. When the contents of CNT and IL were 0.5 and 1.0 wt%, respectively, the optimal properties were obtained. PEI/CNT‐IL fibers exhibited a maximum tensile strength of 2.0 cN/dtex with the elongation at break being 90%, and the enhanced electrical conductivity of 10−5 S·cm−1, which was increased by 13 orders of magnitude compared to that of pristine PEI fiber.Highlights PEI composite fibers were prepared via melt spinning with the assistance of IL and CNT. IL can effectively disperse CNT and plasticize PEI to reduce the processing temperature. The synergistic effect of CNT and IL has improved the tensile strength and antistatic properties of PEI fibers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and properties of polyetherimide fibers based on the synergistic effect of carbon nanotubes and ionic liquids

Ke,

Yang,

Zhang

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…Ultrasonication disperses agglomerated GNPs with bubbles generated by strong local shear force, and the GNPs aggregations are scattered by bubble forming and rupturing [ 13 ]. However, GNPs will tend to re-agglomerate over time due to the gain in entropy after the treatment of high-speed shear or ultrasonication [ 25 , 26 ]. Therefore, a surfactant has been frequently used to prevent such re-agglomeration since it can adsorb on the surface of GNPs particles to cause steric hindrance among them [ 23 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Graphene Nanoplatelets Dispersion and Its Performance in Cement Mortars

Zhou¹,

Wang

Gao

et al. 2022

Materials

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As promising next-generation conducting materials, Graphene Nanoplatelets (GNPs) have been widely used to enhance the mechanical and pressure-sensitive properties of cement-based materials. However, this beneficial effect highly depended on its dispersion. In this study, polyvinyl pyrrolidone (PVP) surfactant, high-speed shear, and ultrasonication were used to disperse GNPs. To fully exert the mechanical and pressure-sensitive properties and enhance the dispersion effect of GNPs in cement-based materials, the dispersing method parameters, including PVP concentration, ultrasonication time, shear time, and rate, were optimized. The dispersion degree of GNPs was evaluated by absorbance. The results show that the optimal dispersion parameters were 10 mg/mL of PVP concentration, 15 min of ultrasonication time, 15 min of shear time, and 8000 revolutions per minute (rpm) of shear rate. In addition, the effect of GNPs dosage (0.05, 0.1, 0.3, 0.5, 0.7, and 1.0 wt%) on the setting time, flowability, and mechanical and pressure-sensitive properties of cement mortar were examined. Results reveal that the optimum dosage of GNPs was found at 1.0 wt%.

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Single Walled Carbon Nanotube/Carboxymethyl Cellulose-Based Polyester Composite Nanofiltration Membrane for Enhanced Water Purification

Dong,

Li,

Cheng

et al. 2024

Water Air Soil Pollut

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Scalable production of high-quality carbon nanotube dispersion in aqueous solution using cellulose as dispersant by a freezing/thawing process

Cited by 10 publications

References 52 publications

Preparation and properties of polyetherimide fibers based on the synergistic effect of carbon nanotubes and ionic liquids

Preparation and properties of polyetherimide fibers based on the synergistic effect of carbon nanotubes and ionic liquids

Optimization of Graphene Nanoplatelets Dispersion and Its Performance in Cement Mortars

Single Walled Carbon Nanotube/Carboxymethyl Cellulose-Based Polyester Composite Nanofiltration Membrane for Enhanced Water Purification

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