Enriched surface acidity for surfactant-free suspensions of carboxylated carbon nanotubes purified by centrifugation

Braun, Elizabeth I.; Draper, Rockford K.; Pantano, Paul

doi:10.1016/j.ancr.2016.04.001

Cited by 5 publications

(4 citation statements)

References 82 publications

(72 reference statements)

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“…The π-plasmon absorption peaks at ca. 240 nm result from the excitation of the π-electron systems which are apparent in all sp 2 hybridised carbon materials [29]. In agreement with the results presented in this study, the relative increase in peak absorbance of the C-MWNCT in comparison to the MWCNTs was also determined in other work [30,31].…”

Section: Uv-vissupporting

confidence: 91%

Diamine Oxidase-Conjugated Multiwalled Carbon Nanotubes to Facilitate Electrode Surface Homogeneity

Amin

Abdullah

Rowley‐Neale

et al. 2022

Sensors

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Carbon nanomaterials have gained significant interest over recent years in the field of electrochemistry, and they may be limited in their use due to issues with their difficulty in dispersion. Enzymes are prime components for detecting biological molecules and enabling electrochemical interactions, but they may also enhance multiwalled carbon nanotube (MWCNT) dispersion. This study evaluated a MWCNT and diamine oxidase enzyme (DAO)-functionalised screen-printed electrode (SPE) to demonstrate improved methods of MWCNT functionalisation and dispersion. MWCNT morphology and dispersion was determined using UV-Vis spectroscopy (UV-Vis) and scanning electron microscopy (SEM). Carboxyl groups were introduced onto the MWCNT surfaces using acid etching. MWCNT functionalisation was carried out using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC) and N-Hydroxysuccinimide (NHS), followed by DAO conjugation and glutaraldehyde (GA) crosslinking. Modified C-MWNCT/EDC-NHS/DAO/GA was drop cast onto SPEs. Modified and unmodified electrodes after MWCNT functionalisation were characterised using optical profilometry (roughness), water contact angle measurements (wettability), Raman spectroscopy and energy dispersive X-ray spectroscopy (EDX) (vibrational modes and elemental composition, respectively). The results demonstrated that the addition of the DAO improved MWCNT homogenous dispersion and the solution demonstrated enhanced stability which remained over two days. Drop casting of C-MWCNT/EDC-NHS/DAO/GA onto carbon screen-printed electrodes increased the surface roughness and wettability. UV-Vis, SEM, Raman and EDX analysis determined the presence of carboxylated MWCNT variants from their non-carboxylated counterparts. Electrochemical analysis demonstrated an efficient electron transfer rate process and a diffusion-controlled redox process. The modification of such electrodes may be utilised for the development of biosensors which could be utilised to support a range of healthcare related fields.

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Section: Uv-vissupporting

confidence: 91%

Diamine Oxidase-Conjugated Multiwalled Carbon Nanotubes to Facilitate Electrode Surface Homogeneity

Amin

Abdullah

Rowley‐Neale

et al. 2022

Sensors

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“…Furthermore, all concentrations of MWCNT-COOHs were freshly prepared in three types of aqueous medium: deionized water (pH 7.1), DMEM-F12 (pH 6.9-7.1), and DMEM-F12 supplemented with FBS (10% v/v) (pH 6.9-7.1). The refractive index of MWCNT-COOH used in DLS analysis was 1.891 [30]. SHEDs were obtained from Human Genetics and Cell Therapy Biobank (GENETEC) at the Federal University of Juiz de Fora.…”

Section: Dynamic Light Scattering and Zp Evaluationmentioning

confidence: 99%

Cytocompatibility of carboxylated multi-wall carbon nanotubes in stem cells from human exfoliated deciduous teeth

Oliveira¹,

Fayer²,

Zanette³

et al. 2021

Nanotechnology

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Carboxylated multi-wall carbon nanotube (MWCNT-COOH) presents unique properties due to nanoscale dimensions and permits a broad range of applications in different fields, such as bone tissue engineering and regenerative medicine. However, the cytocompatibility of MWCNT-COOH with human stem cells is poorly understood. Thus, studies elucidating how MWCNT-COOH affects human stem cell viability are essential to a safer application of nanotechnologies. Using stem cells from the human exfoliated deciduous teeth model, we have evaluated the effects of MWCNT-COOH on cell viability, oxidative cell stress, and DNA integrity. Results demonstrated that despite the decreased metabolism of mitochondria, MWCNT-COOH had no toxicity against stem cells. Cells maintained viability after MWCNT-COOH exposure. MWCNT-COOH did not alter the superoxide dismutase activity and did not cause genotoxic effects. The present findings are relevant to the potential application of MWCNT-COOH in the tissue engineering and regenerative medicine fields.

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“…[ 71 ] However, the bundled structure of SWNTs and poor solubility in solvents results in strong π–π interactions, thus restricting their applications. [ 72 ] Covalent chemical functionalization, [ 73–75 ] acid treatment, [ 76–78 ] noncovalent functionalization using hydrophobic interactions, [ 79–81 ] formation of supramolecular complexes in the presence of π electron‐donating compounds including pyrenes, [ 82 ] porphyrins, [ 83 ] and π‐conjugated polymers under ultrasonication are the ways to impart sufficient solubility in SWNTs. [ 72 ] Consequently, the interactions between SWNTs and π electron‐rich compounds can provide moderate solubility to SWNTs.…”

Section: Carbon Nanohybridsmentioning

confidence: 99%

Carbon Nanohybrids for Advanced Electronic Applications

Deshmukh

Park

Kang

et al. 2020

Physica Status Solidi (a)

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Recently, carbon nanohybrids based on carbon nanomaterials including fullerene, carbon nanotube (CNT), carbon nanofiber (CNF), and graphene have attracted considerable attention in the field of science and technology due to their unique electrical, mechanical, chemical, spectroscopic properties, and high porosities. These nanohybrids not only increase electrical conductivity, but also enhance surface areas, thereby overcoming the limitations of individual carbon nanomaterial for material science and electronic engineering. Herein, the electronic and materials properties of carbon nanohybrids consisting of CNT/graphene, CNT/fullerene, CNT/CNF, and graphene/fullerene for advanced electronic applications are discussed.

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Enriched surface acidity for surfactant-free suspensions of carboxylated carbon nanotubes purified by centrifugation

Cited by 5 publications

References 82 publications

Diamine Oxidase-Conjugated Multiwalled Carbon Nanotubes to Facilitate Electrode Surface Homogeneity

Diamine Oxidase-Conjugated Multiwalled Carbon Nanotubes to Facilitate Electrode Surface Homogeneity

Cytocompatibility of carboxylated multi-wall carbon nanotubes in stem cells from human exfoliated deciduous teeth

Carbon Nanohybrids for Advanced Electronic Applications

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