Structural changes in colloid solutions of nanodiamond

Бацанов, С. С.; Dan’kin, Dmitry A.; Гаврилкин, С. М.; Дружинина, А.И.; Batsanov, Andrei S.

doi:10.1039/c9nj05191k

Cited by 7 publications

(9 citation statements)

References 56 publications

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“…The refractive index of nanodiamonds is not equal to the refractive index of diamond due to the developed surface and the presence of many surface groups [ 16 ], but it is likely that the refractive index of nanodiamonds of any grade is within the value 2.4 ± 0.1 [ 49 ]. Thus, the estimation of the penetration (signal-gathering) depth by ATR with Equation (1) at 4000 cm −1 gives the value 240 nm, which is comparable to the characteristic size of ND clusters [ 43 , 50 , 51 ]. The maximum penetration depth of radiation in ATR measurements for a wavenumber of 400 cm −1 is ca.…”

Section: Resultsmentioning

confidence: 99%

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR Spectroscopies

2020

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The qualitative analysis of nanodiamonds by FTIR spectrometry as photoacoustic (FTIR–PAS), diffuse-reflectance (DRIFT), and attenuated total reflection (ATR) modalities was evaluated for rapid and nondestructive analysis and comparison of nanodiamonds. The reproducibility and signal-gathering depth of spectra was compared. The assignment of characteristic bands showed that only six groups of bands were present in spectra of all the modalities with appropriate sensitivity: 1760 (C=O stretch, isolated carboxyl groups); 1640–1632 (H–O–H bend, liquid water); 1400–1370 (non-carboxyl C–O–H in-plane bend and CH2 deformation); 1103 (non-carboxyl C–O stretch); 1060 (in-plane C–H bend, non-aromatic hydrocarbons and carbohydrates); 940 cm−1 (out-of-plane carboxyl C–O–H bend). DRIFT provides the maximum number of bands and is capable of measuring hydrogen-bonded bands and CHx groups. ATR provides the good sensitivity for water and C–H/C–C bands in the range 2000–400 cm−1. FTIR–PAS reveals less bands than DRIFT but more intense bands than ATR–FTIR and shows the maximum sensitivity for absorption bands that do not appear in ATR-IR spectra and are expedient for supporting either DRIFT or FTIR–PAS along with depth-profiling. Thus, all three modalities are required for the full characterization of nanodiamonds surface functional groups.

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Section: Resultsmentioning

confidence: 99%

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR Spectroscopies

2020

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“…Thus, the estimation of the penetration (signal-gathering) depth by ATR, Eq. (1) at 4000 cm -1 gives the value is 240 nm, which is comparable to the characteristic size of ND clusters [44,51,52]. The maximum penetration depth of radiation in ATR measurements for a wavenumber of 400 cm -1 is ca.…”

Section: Signal-gathering Depth and Pas Modulation Frequency Comparisonmentioning

confidence: 74%

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR spectroscopies

Volkov

Krivoshein

Проскурнин

2020

Preprint

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The qualitative analysis of nanodiamonds by FTIR spectrometry as photoacoustic (PAS), diffuse-reflectance (DRIFT), and attenuated total reflection (ATR) modalities was evaluated for rapid and nondestructive analysis and comparison of nanodiamonds. The spectra reproducibility and signal-gathering depth was compared. The assignment of characteristic bands showed that only six groups of bands were present in spectra of all the modalities with appropriate sensitivity: 1760 (C=O stretch, isolated carboxyl groups); 1640–1632 (H–O–H bend, liquid water); 1400–1370 (non-carboxyl C–O–H in-plane bend and CH2 deformation); 1103 (non-carboxyl C–O stretch); 1060 (in-plane C–H bend, non-aromatic hydrocarbons and carbohydrates); and 940 cm–1 (out-of-plane carboxyl C–O–H bend). DRIFT provides the maximum number of bands and is capable of measuring hydrogen-bonded bands and CHX groups. ATR provides the good sensitivity for water and C–H/C–C bands in the range 2000–400 cm–1. PAS-FTIR reveals less bands than DRIFT but more intense bands than ATR-FTIR and shows the maximum sensitivity for absorption bands that do not appear in ATR-IR spectra and are expedient for supporting either DRIFT or PAS along with depth-profiling. Thus, all three modalities are required for full characterization of nanodiamonds surface functional groups.

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“…[19] As no attempt was made to break up agglomerates into primary particles, the low DND concentration in DW was obviously limited by the amount of small particles naturally present in the crude product and segregation and deposition of larger particles due to Stokes' law. [20] To increase this concentration and thus to encourage NDF growth, we prepared DW from a slurry of crude DND ball-milled in water. Unexpectedly, although the starting DND concentration was thus increased to 1 %, no NDF formed during evaporation: DW remained clear until dried down to 5-10 % of the original volume, after that fine crystalline colorless sediment began to form, but still no fibers.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen Fixation and Biological Behavior of Nanodiamond Colloidal Solutions

et al. 2020

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Detonation‐produced nanodiamond, both as a powder (with adsorbed water) and especially when suspended in an aqueous colloid, can support the growth (both aerobic and anaerobic) of bacteria and fungi. These were isolated and identified by microbiological methods, optical and electron microscopy, as species of Penicillium, Purpureocillium, Beaveria, Trichoderma and Aspergillus genera. The C : N molar ratio of the developing fibers (comprising fungal mycelia with attached bacteria and entrapped nanodiamond) decreased from 25 to 11 between the 1st and 10th week of incubation (cf. 40 in initial nanodiamond, 4.6 typical for bacteria and 8.3 for fungi), and from 4 to <1 after the 12th week, as the lysis of microorganisms releases carbon as CO2 and nitrogen as NH4+ or NO3−. The nitrogen content of the colloid increased by an order of magnitude and more, due to fixation of N2 by nanodiamond under ambient conditions.The process requires water but not necessarily oxygen present.

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Structural changes in colloid solutions of nanodiamond

Abstract: Segregation of particles in a nanodiamond aqueous colloid due to Stokes’ law leads to re-ordering of the lattice of particles.

Cited by 7 publications

References 56 publications

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR Spectroscopies

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR Spectroscopies

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR spectroscopies

Nitrogen Fixation and Biological Behavior of Nanodiamond Colloidal Solutions

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