Dispersant selection for nanomaterials: Insight into dispersing functionalized carbon nanotubes by small polar aromatic organic molecules

Zhao, Qing; Yang, Kun; Zhang, Siyu; Chefetz, Benny; Zhao, Jian; Mashayekhi, Hamid; Xing, Baoshan

doi:10.1016/j.carbon.2015.05.014

Cited by 27 publications

(16 citation statements)

References 37 publications

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“…Particle and aggregate sizes have been shown to influence the uptake of MWCNTs by plants [13,15]. Our previous study demonstrated that SPAOMs can disperse MWCNTs and that this dispersibility correlated well with water solubility [41]. Here, TEM images confirmed that dispersibility of MWCNTs increased with increasing SPAOM water solubility (Figure 5a).…”

Section: Stability Effects On Mwcnts Accumulationsupporting

confidence: 68%

“…Given the evidence for the potential toxicity of CNTs to animals [8,16] and plants [19,20,22,[36][37][38][39][40], the effects of SPAOMs on CNT fate should be carefully studied. Our previous study showed that SPAOMs can promote CNTs dispersion and enhance material stability in solution as a function of organic co-solute water solubility [41]. In addition, due to their phytotoxicity [42,43], SPAOMs could also indirectly impact CNTs accumulation in plants by affecting plant biochemical/physiological properties.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative evaluation of multi-wall carbon nanotube uptake by terrestrial plants

Zhao

White

et al. 2017

Carbon

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The extent and mechanisms by which multi-wall carbon nanotubes (MWCNTs) are accumulated by terrestrial plant species is currently unknown. In this study, we successfully measured the MWCNTs content in different plant (Arabidopsis thaliana, rice, maize and soybean) using 14 C labeled MWCNTs. Quantitative relationships among the uptake amount of MWCNTs in different Arabidopsis tissues, the physiological (water loss, pigment content, and total protein content) and biochemical parameters (antioxidant enzyme activities) were further evaluated. Our results indicated that changes in biochemical parameters were much more sensitive than physiological parameters. The lowest CAT activities in the treatment with (1,3dinitrobenzene + MWCNTs) were only 0.13-fold of that in the 1,3-dinitrobenzene alone treatment, suggesting MWCNTs could alleviate the toxicity to Arabidopsis. Due to the toxicity caused by small polar aromatic organic molecules (SPAOMs), the MWCNTs uptake in leaf in the treatment with (2,4-dichlorophenol + MWCNTs) was only 0.07-fold relative to the MWCNTs alone treatment. Hydrodynamic diameter of MWCNTs in solution did not significantly affect MWCNTs uptake. Uptake models for MWCNTs into root and leaf tissue were constructed via stepwise multiple linear regression analysis. This study will provide important information for the accurate determination of risk associated with MWCNT exposure.

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Section: Stability Effects On Mwcnts Accumulationsupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Quantitative evaluation of multi-wall carbon nanotube uptake by terrestrial plants

Zhao

White

et al. 2017

Carbon

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“…Although various polymers [162][163][164], DNA [165] and detergents [166] have all shown potential as surfactants in this process, to date, sodium dodecyl sulfate (SDS) has been the most widely used [167][168][169][170][171]. SDS has been used to prepare suitable homogeneous dispersions of CNTs for the preparation of thin films at the electrode interface [172,173].…”

Section: Cnt-based Amperometric Transducersmentioning

confidence: 99%

“…SDS has been used to prepare suitable homogeneous dispersions of CNTs for the preparation of thin films at the electrode interface [172,173]. Comparison of different CNTs dispersing strategies have been investigated [162][163][164] and applied to the fabrication of numerous modified electrode based sensing probes [68,136].…”

Section: Cnt-based Amperometric Transducersmentioning

confidence: 99%

Carbon nanomaterials and their application to electrochemical sensors: a review

Power¹,

Gorey²,

Chandra³

et al. 2018

Nano Online

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Carbon has long been applied as an electrochemical sensing interface owing to its unique electrochemical properties. Moreover, recent advances in material design and synthesis, particularly nanomaterials, has produced robust electrochemical sensing systems that display superior analytical performance. Carbon nanotubes (CNTs) are one of the most extensively studied nanostructures because of their unique properties. In terms of electroanalysis, the ability of CNTs to augment the electrochemical reactivity of important biomolecules and promote electron transfer reactions of proteins is of particular interest. The remarkable sensitivity of CNTs to changes in surface conductivity due to the presence of adsorbates permits their application as highly sensitive nanoscale sensors. CNT-modified electrodes have also demonstrated their utility as anchors for biomolecules such as nucleic acids, and their ability to diminish surface fouling effects. Consequently, CNTs are highly attractive to researchers as a basis for many electrochemical sensors. Similarly, synthetic diamonds electrochemical properties, such as superior chemical inertness and biocompatibility, make it desirable both for (bio) chemical sensing and as the electrochemical interface for biological systems. This is highlighted by the recent development of multiple electrochemical diamond-based biosensors and bio interfaces.Keywords: bio sensors; carbon nanomaterials; carbon nanotubes; electrochemical sensing; synthetic diamond Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.

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“…In contrast to the solubilization and competition that both can enhance the bioavailability, the possibly improved dispersion of CNTs caused by the components in gastrointestinal fluids may lead to a reduction of bioavailability owing to the increasing adsorption surface area of CNTs (Zhao et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Adsorption and bioaccessibility of phenanthrene on carbon nanotubes in the in vitro gastrointestinal system

Zhao

et al. 2016

Science of The Total Environment

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Adsorption and bioaccessibility of phenanthrene on graphite and multiwalled carbon nanotubes (CNTs) were investigated in simulated gastrointestinal fluid using a passive dosing system. The saturated adsorption capacity of phenanthrene on different adsorbents follows an order of hydroxylated CNTs (H-CNTs)>carboxylated CNTs (C-CNTs)>graphitized CNTs (G-CNTs)>graphite, consistent with the order of their surface area and micropore volume. The change of phenanthrene adsorption on the adsorbents is different with the presence of pepsin (800mg/L) and bile salts (500mg/L and 5000mg/L, abbreviated as BS500 and BS5000). Both solubilization of phenanthrene by pepsin and bile salts and their competition with phenanthrene for the adsorption sites play a role. In addition, the large increase of the maximum adsorption capacity in BS5000 solution indicates an enhanced dispersion of CNTs or an exfoliation of graphite by bile salts, which consequently increases the exposed surface area. The bioaccessibility increases in pepsin and BS500 solution with a growing free phenanthrene concentration. Although the bioaccessibility of phenanthrene stalls or slightly decreases in the middle range of free phenanthrene concentration in BS5000 solution, the bioaccessibility overall is much higher than that in pepsin and BS500 solution at the same phenanthrene level. It is impossible to separate the effect of competition from dispersion (or exfoliation) at this stage, but the relative contribution of solubilization to phenanthrene desorption in pepsin and BS500 solutions was quantified, which improves our understanding of the mechanisms on bioaccessibility of adsorbed pollutants on CNTs.

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Dispersant selection for nanomaterials: Insight into dispersing functionalized carbon nanotubes by small polar aromatic organic molecules

Cited by 27 publications

References 37 publications

Quantitative evaluation of multi-wall carbon nanotube uptake by terrestrial plants

Quantitative evaluation of multi-wall carbon nanotube uptake by terrestrial plants

Carbon nanomaterials and their application to electrochemical sensors: a review

Adsorption and bioaccessibility of phenanthrene on carbon nanotubes in the in vitro gastrointestinal system

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