The geometrical advantages of helical carbon nanotubes for high-performance multifunctional polymeric nanocomposites

Vijayan, R.; Ghazinezami, Ali; Taklimi, Sean Reza; Khan, Moheimin; Askari, Davood

doi:10.1016/j.compositesb.2018.08.035

Cited by 40 publications

(24 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, small amounts of helical CNTs (e.g., nearly 1 gram for each method) were functionalized, using the presented methods (i.e., M1 through M9). Our goal was to incorporate these functionalized HCNTs (i.e., at very low weight percentages of less than 0.1%) into polymeric resins for nanocomposite applications [57]. However, one can scale-up these chemical processes to functionalize higher amounts of helical CNTs (e.g., tens to hundreds of grams), using larger size containers, bigger sonication bath, bigger filters, and an appropriately designed fume hood system that can accommodate the larger size experimental setups.…”

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Chemical Functionalization of Helical Carbon Nanotubes: Influence of Sonication Time and Concentrations of Sulfuric and Nitric Acids with 3 : 1 Mixing Ratio

Taklimi

Ghazinezami

Askari

2019

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

Carbon nanotubes (CNTs) with straight geometries have been widely studied for various engineering applications, and they are often treated or functionalized to improve their effectiveness, depending on their role and expected performance. However, helical configurations of CNTs (HCNTs) have not been sufficiently investigated, especially in their functionalized states for high-performance nanocomposite applications. The coil-shaped geometry of these HCNTs increases the mechanical entanglement of these nanotubes with a host resin system when they are used as reinforcements. This consequently has the potential to improve the mechanical, thermal, electrical, and magnetic properties of the polymeric matrix systems. A uniform dispersion of CNTs in the resin plays an important role in obtaining improved and consistent properties in the final nanocomposite part. To improve the homogeneous dispersion (individual suspension) of these nanotubes in the host resin and to enhance their interactions/bonds with the resin molecules, the surface of these nanotubes should be modified. This study investigates a sonication method for chemical functionalization of HCNTs using a mixture of sulfuric and nitric acids with 3 to 1 mixing ratio [3 : 1], and it evaluates the effects of acid concentrations and sonication time on the severity of the functionalization process. To evaluate the effectiveness of the process parameters, the functionalized HCNTs (FHCNTs) were examined using several characterization instruments and techniques such as Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD), visual dispersion test, and Raman spectroscopy. The characterization results confirmed that the changes in process parameters were mostly effective and the atomic structures of the functionalized HCNTs were successfully altered. All FHCNT samples demonstrated higher dispersion uniformity, increase in Raman ID/IG ratios, and changes in the FTIR spectra compared to the pristine HCNTs. Most of the FHCNTs had a reduction in crystallinity, which was consistent with our expectation that functionalization generates more defects on the surface structure of HCNTs, thus leading to a lower intensity of the graphitic peak. The largest reduction in crystallinity was seen for HCNTs treated with a 16 molarity acidic solution; therefore, the HCNTs that were treated with lower molarity acids could be used for further studies and explored for their effective applications in improving the mechanical, thermal, and electrical properties of polymeric nanocomposites.

show abstract

Section: Scanning Electron Microscopy (Sem)mentioning

confidence: 99%

Chemical Functionalization of Helical Carbon Nanotubes: Influence of Sonication Time and Concentrations of Sulfuric and Nitric Acids with 3 : 1 Mixing Ratio

Taklimi

Ghazinezami

Askari

2019

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thermally conductive polymer composites containing carbon nanotubes are a versatile class of materials, which are of great interest for a variety of applications . Commercialization is an inevitable trend in the development of various thermally conductive polymer composites.…”

Section: Introductionmentioning

confidence: 99%

“…Thermally conductive polymer composites containing carbon nanotubes are a versatile class of materials, which are of great interest for a variety of applications. [15][16][17][18] Commercialization is an inevitable trend in the development of various thermally conductive polymer composites. However, the realization of the full technological and commercial potential of such novel materials depends heavily on the ability to produce polymer composites with tailored thermal properties and on a positive exploration of new application areas.…”

Section: Introductionmentioning

confidence: 99%

Epoxy matrix composites reinforced with purified carbon nanotubes for thermal management applications

Chen

Gao

Song

2019

Polymers for Advanced Techs

View full text Add to dashboard Cite

The role of carbon nanotube purification treatment as a means to improve the thermal properties of polymer matrix composites was investigated. Particular emphasis was placed on clarifying the processing‐property relationship in polymer composites for thermal management applications. The results indicated that purification treatment is critical to the thermal properties of derived polymer composites. Purification treatment can yield a twofold increase in composite thermal conductivity because of improved effectiveness in interfacial interaction and increased chemical purity of the filler. However, there is a trade‐off between the benefits and disadvantages associated with purification treatment, particularly when thermal and electrical properties are both concerned. Purification treatment gives rise to a sharp decrease in composite electrical conductivity by at least two orders of magnitude because of the lack of an effective percolating network. The effect of purification treatment on composite electrical properties is more significant than on its thermal properties.

show abstract

“…Significant insights have been gained through nanotechnology research, with over 20 papers each day currently appearing in relation to carbon nanotubereinforced polymer nanocomposites alone, as shown in Figure 2. One of the most interesting avenues of research involves manipulation of the chemistry of carbon nanotubes [71][72][73][74], which offers great opportunities for developing multifunctional polymer nanocomposites with the ability to tailor the properties of the interface [75,76]. As yet, the physical and chemical nature of the interface, along with its influence on the bulk properties of carbon nanotubereinforced polymer nanocomposites, remains a poorly understood area of research.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Characterization Techniques for the Interface in Carbon Nanotube-Reinforced Polymer Nanocomposites

Chen

Gao

2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The current state of characterization techniques for the interface in carbon nanotube-reinforced polymer nanocomposites is reviewed. Different types of interfaces that exist within the nanocomposites are summarized, and current efforts focused on understanding the interfacial properties and interactions are reviewed. The emerging trends in characterization techniques and methodologies for the interface are presented, and their strengths and limitations are summarized. The intrinsic mechanism of the interactions at the interface between the carbon nanotubes and the polymer matrix is discussed. Special attention is given to research efforts focused on chemical functionalization of carbon nanotubes. The benefits and disadvantages associated with covalent and noncovalent functionalization methods are evaluated, respectively. Various techniques used to characterize the properties of the interface are extensively reviewed. How the mechanical and thermal properties of the nanocomposites depend on the physical and chemical nature of the interface is also discussed. Better understanding and design of the interface at the atomic level could become the forefront of research in the polymer community. Potential problems going to be solved are finally highlighted.

show abstract

The geometrical advantages of helical carbon nanotubes for high-performance multifunctional polymeric nanocomposites

Cited by 40 publications

References 48 publications

Chemical Functionalization of Helical Carbon Nanotubes: Influence of Sonication Time and Concentrations of Sulfuric and Nitric Acids with 3 : 1 Mixing Ratio

Chemical Functionalization of Helical Carbon Nanotubes: Influence of Sonication Time and Concentrations of Sulfuric and Nitric Acids with 3 : 1 Mixing Ratio

Epoxy matrix composites reinforced with purified carbon nanotubes for thermal management applications

Recent Advances in Characterization Techniques for the Interface in Carbon Nanotube-Reinforced Polymer Nanocomposites

Contact Info

Product

Resources

About