Recent advances in the use of carbon nanotubes as smart biomaterials

Menezes, Beatriz Rossi Canuto de; Rodrigues, Karla Faquine; Fonseca, Beatriz Carvalho da Silva; Ribas, Renata Guimarães; Montanheiro, Thaís Larissa do Amaral; Thim, Gilmar Patrocínio

doi:10.1039/c8tb02419g

Cited by 95 publications

(71 citation statements)

References 133 publications

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“…Figure 5 shows TEM images of CNT, CNT-Ox, and CNT-GB. CNT micrograph showed, in its majority, black dots along the tubes, which are catalyst metallic particles used in the production step of CNT [10,13,34]. The black spots are easily observed in Fig.…”

Section: Raman Spectroscopymentioning

confidence: 91%

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Covalently γ-aminobutyric acid-functionalized carbon nanotubes: improved compatibility with PHBV matrix

et al. 2019

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The improvement of compatibility between carbon nanotubes (CNTs) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was achieved using CNT functionalized with γ-aminobutyric acid (GABA). The efficiency of the CNT functionalization with GABA was evaluated by X-ray photoelectron spectroscopy (XPS), infrared spectroscopy (FT-IR), Raman spectroscopy, and transmission electron microscopy (TEM). The PHBV/CNT nanocomposites were produced in the molten state with the addition of 0.5 wt% of CNT (pristine, oxidized and functionalized with GABA) and characterized concerning the Izod impact strength tests. The impact fracture morphologies were analyzed using scanning electron microscopy. The results showed that GABA was covalently attached to CNT, resulting in the detection of nitrogen in the XPS survey, the shift of carbonyl peak wavelength on FT-IR, and a higher degree of structural disorder, detected by Raman and observed in TEM images. The impact strength was not significantly affected by the introduction of CNT; however, the impact fracture mechanism was changed from fragile to ductile when CNT was functionalized with GABA. These results are promising for the production of environmentally friendly nanocomposites with superior properties.

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Section: Raman Spectroscopymentioning

confidence: 91%

“…To overcome the limitations of PHBV properties, the incorporation of nanoparticles has been a widely studied alternative [5][6][7][8][9][10][11][12]. Among nanoparticles, carbon nanotubes (CNTs) are specially investigated to improve properties of matrices, due to their outstanding electrical, optical, and mechanical properties [13].…”

Section: Introductionmentioning

confidence: 99%

Covalently γ-aminobutyric acid-functionalized carbon nanotubes: improved compatibility with PHBV matrix

et al. 2019

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“…-COOH groups can react with a large number of other chemical compounds, attaching a functional group suitable to better dispersion and interaction properties, depending on the polymeric matrix [14]. Different reactive chemical groups can be used, such as alkyl, phenyl, amide, ester, silanes, thiol, and biomolecules [15]. Non-covalent functionalization, through weak van der Waals interactions, can also be used to modify the CNTs, without any damage to their structure and properties.…”

Section: Introductionmentioning

confidence: 99%

“…Non-covalent functionalization, through weak van der Waals interactions, can also be used to modify the CNTs, without any damage to their structure and properties. In this case, ionic liquids, biomolecules, and other chemical compounds are adsorbed on CNT surfaces, shielding the stacking interactions [15,16]. Since polyethylene has a nonpolar character, the use of covalent functionalization with long-chain amines for CNTs provides a better interaction with this polymer [17].…”

Section: Introductionmentioning

confidence: 99%

“…Many studies have investigated the crystallization kinetic of composites based on PE. Tarani et al [21] investigated the effect of incorporating graphene nanoplatelets with an average thickness of 10 nm and different sizes (5,15, and 25 µm) in diameter on the crystallization kinetics of high-density polyethylene (HDPE) under non-isothermal conditions. Different models were tested, and the authors showed that the Avrami analysis modified by Jeizorny and the Mo method described very well the non-isothermal crystallization of the nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Non-Isothermal Crystallization Kinetic of Polyethylene/Carbon Nanotubes Nanocomposites Using an Isoconversional Method

et al. 2019

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Behavior studies of thermoplastic polymers during non-isothermal crystallization are extremely important since most of their properties are influenced by degree of crystallinity and the crystallization process. In general, an approach based on a model-fitting method is used to perform crystallization kinetic studies. Due to their inability to uniquely determine the reaction mode, many studies have used the isoconversional method, where it is not necessary to assume a crystallization model to obtain the kinetic parameters. Therefore, in this work, the influence of acid and octadecylamine functionalized carbon nanotubes (CNTs) in the crystallization kinetic of polyethylene (PE) was studied using an isoconversional method with differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The kinetic parameters and the crystallization model were determined. The incorporation of functionalized and non-functionalized CNTs into PE did not change the Johnson-Mehl-Avrami crystallization model. However, the CNTs increased the crystallization temperature and reduced the activation energy for crystallization. In addition, the Avrami coefficient values were lower for the nanocomposites when compared to pure PE. The incorporation of CNTs accelerated the crystallization of PE, reducing the crystallite sizes and modifying their morphology.

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Emerging Carbon‐Based Nanocomposites for Remediation of Heavy Metals and Organic Pollutants from Wastewater

Kar

Jain

Gupta

et al. 2020

Emerging Carbon‐Based Nanocomposites for Environmental Applications

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Recent advances in the use of carbon nanotubes as smart biomaterials

Abstract: Carbon nanotubes (CNTs) have outstanding properties that can be used to produce intelligent devices to detect pathogens, delivery drugs, and replace bone and dental parts. Therefore, CNTs have been extensively studied as medical devices.

Cited by 95 publications

References 133 publications

Covalently γ-aminobutyric acid-functionalized carbon nanotubes: improved compatibility with PHBV matrix

Covalently γ-aminobutyric acid-functionalized carbon nanotubes: improved compatibility with PHBV matrix

Non-Isothermal Crystallization Kinetic of Polyethylene/Carbon Nanotubes Nanocomposites Using an Isoconversional Method

Emerging Carbon‐Based Nanocomposites for Remediation of Heavy Metals and Organic Pollutants from Wastewater

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