Colloidal stability of modified nanodiamond particles

Gibson, Natalie M.; Shenderova, Olga; Luo, Tzy Jiun Mark; Мосеенков, С. И.; Bondar, V. S.; Puzyr, A. P.; Пуртов, К. В.; Fitzgerald, Z.; Brenner, Donald W.

doi:10.1016/j.diamond.2008.10.049

Cited by 231 publications

(144 citation statements)

References 27 publications

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“…Nanodiamond particles (NDs), produced through detonation synthesis, are a prospective enterosorbent material 29,30 due to their high dispersivity, which allows for easy administration and quantifiable dosing through water substitutions. In addition, their colloidal stability and sorption capacities are preserved over a wide pH range, important for interacting in the GI tract.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of mycotoxins on modified nanodiamond substrates

et al. 2011

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The effectiveness of modified nanodiamonds (NDs) for the adsorption of mycotoxins, aflatoxin B1 (AfB1) and ochratoxin A (OTA), are investigated in this paper. Binding and release mechanisms of the mycotoxins were addressed using an assortment of NDs modified by different surface treatments, including carboxylation, hydrogenation and hydroxylation, followed by isolating NDs of different sizes. Results indicate that AfB1 adsorption on NDs is directly related to aggregate size, whereas OTA adsorption is primarily centered upon electrostatic interactions that depend on the types of surface functional groups on the ND. Findings show that modified NDs with small aggregation sizes (~40 nm) have greater adsorption capacities for AfB1 than yeast cells walls and untreated NDs from various vendors, but comparable to activated charcoal. In OTA studies, positively charged NDs outperformed clay minerals, which are well-known and efficient sorbents for mycotoxins. Furthermore, ND adsorption capacities can be preserved in a wide range of pH.

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Section: Introductionmentioning

confidence: 99%

Immobilization of mycotoxins on modified nanodiamond substrates

et al. 2011

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“…25,38 The presence of the Warburg component can be explained by: (1) the porous structure and the surface roughness; (2) the infinite-element approximation of the material. 24,25 Both of the proposed mechanisms are feasible in our case. At the temperature range below 100 º C, the aggregated DND can be considered as a porous material with a grain size in the order of micrometers (Fig.…”

mentioning

confidence: 77%

“…Preliminary analysis suggests that the presence of the Warburg element can be attributed to the water absorption on the surface and the colloidal properties of the DND powder. 24 Besides, the formation of C-H bonds on DND particles' shell enhances their conductivity and possibly enables an infinite-length approximation of their electrical properties. Similar results have been reported on the electrochemical properties of DND fabricated electrodes by Zang et al 25 The author attributed the low frequency linear portion to the inhomogeneous porous structure, which leads to a non-ideal capacitive element.…”

Section: A Impedance Spectroscopymentioning

confidence: 99%

Hydrogen-terminated detonation nanodiamond: Impedance spectroscopy and thermal stability studies

Shi

Kundrát

et al. 2013

Journal of Applied Physics

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In this paper, we investigated the effect of hydrogen termination on the electrical properties and impedance spectra of detonation nanodiamond. The impedance spectra revealed that the hydrogen-termination process increases the electrical conductivity by four orders of magnitude at room temperature. An equivalent circuit has been proposed to correlate with the conduction mechanism. Arrhenius plot showed that there were two different activation energy levels located at 0.089 eV and 0.63 eV between 50 º C and 400 º C.The possible physical mechanism corresponding to these activation energy levels has been discussed. Hydrogen-terminated detonation nanodiamond has been further annealed at different temperatures prior to FTIR and XPS measurements in order to understand their thermal stability. The results demonstrated that the surface oxidization occurred between 100 º C and 150 º C. However, the C-H bonds could partially survive when the temperature reaches 400 º C in air.

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“…(1). The 2.0 % NV gave the average size of 254±20.32 nm, PDI of 0.322 and zeta potential of -50.07±3.11 mV which was outside the range of ± 30 mV range demonstrating the physical stability of the dispersion [18]. After stored at 4 and 25°C for 3 months, the loaded niosomes showed the range of size of about 230-280 nm, while the niosomes at 45°C showed more fluctuate size of about 250-300 nm.…”

Section: Particle Sizes and Zeta Potential Of Niosomes Loaded With Vvmentioning

confidence: 96%

Transdermal Delivery Enhancement of Gel Containing Niosomes Loaded with Volvariella Volvacea Extract

Ruksiriwanich¹,

Jantrawut²

2015

TOPROCJ

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Our previous study demonstrated the potent in vitro collagen biosynthesis stimulating and antioxidant activities of Volvariella volvacea extract. This study was performed the loading of V. volvacea extract (VV) in niosomes (NV). The physicochemical characterization of the VV loaded niosomes and gel containing niosome of the extract (GNV) was studied. Rat skin transdermal absorption by Franz diffusion cells at 6 hours of NV, GNV was compared with V. Volvacea extract solution (SV). GNV and NV showed higher chemical stability of total phenolic contents than SV. NV exhibited negative zeta potential values with the mean size of 254±20.32 nm. Both GNV and NV retarded the cumulative amounts and fluxes of the total phenolic in the extract in the first hour of skin permeation, while enhanced the skin permeation at the 6 th hour in the experiment. GNV gave the highest percentages of the total phenolic content through rat skin to the receiving solution followed by NV and SV, respectively. This study has demonstrated the potential of gel containing niosomes of the V. volvacea extract appeared to be the suitable system for topical anti-aging application of V. volvacea extract because of the enhancement of chemical stability and rat skin transdermal absorption of V. volvacea extract.

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Colloidal stability of modified nanodiamond particles

Cited by 231 publications

References 27 publications

Immobilization of mycotoxins on modified nanodiamond substrates

Immobilization of mycotoxins on modified nanodiamond substrates

Hydrogen-terminated detonation nanodiamond: Impedance spectroscopy and thermal stability studies

Transdermal Delivery Enhancement of Gel Containing Niosomes Loaded with Volvariella Volvacea Extract

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