Nanodiamonds and surfactants in water: Hydrophilic and hydrophobic interactions

Vervald, Alexey M.; Laptinskiy, Kirill; Burikov, Sergey; Laptinskaya, T. V.; Shenderova, Olga; Власов, И. И.; Dolenko, Tatiana A.

doi:10.1016/j.jcis.2019.03.102

Cited by 27 publications

(7 citation statements)

References 47 publications

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“…When DNDs are suspended in water, the χ 21 parameter noticeably increases, i.e., hydrogen bonds are weakened (Figure 3b). 14,54 As lysozyme is added to the first adsorption layer on the DND surface, χ 21 values decrease, and at lysozyme concentrations of about 0.10 g/L (for DND 13.5 nm) and of about 0.15 g/L (for DND 21 nm), the χ 21 (C lysozyme ) dependence for the DND + lysozyme complex achieves a plateau and becomes similar to the dependence χ 21 (C lysozyme ) for an aqueous solution of lysozyme. It can be assumed that at the indicated and higher concentrations of lysozyme, the enzyme tightly "envelops" the nanoparticles while shielding water molecules from nanodiamonds so that the χ 21 (C lysozyme ) dependence becomes the same as for lysozymes in water without nanodiamonds.…”

Section: Resultsmentioning

confidence: 99%

Bilayer Adsorption of Lysozyme on Nanodiamonds in Aqueous Suspensions

Vervald

Burikov

et al. 2020

J. Phys. Chem. C

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The interactions of one of the most famous enzymes, lysozyme, with carboxylated nanodiamonds in water were studied. It was found that stable complexes are formed as a result of lysozyme adsorption on the surface of nanodiamonds. Based on the obtained adsorption isotherms and change in the fluorescence of nanodiamonds during the adsorption of lysozyme on them, it is concluded that lysozyme is adsorbed on carboxylated nanodiamonds in two layers. Numerical estimates and IR absorption spectroscopy data showed that the lysozyme has different adsorption orientations in the first and second layers, with preferential side-on and end-on orientations, correspondingly. Moreover, in the first layer, lysozyme undergoes significant conformational changes. The enzymatic activity of adsorbed lysozyme in both layers is discussed.

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Section: Resultsmentioning

confidence: 99%

Bilayer Adsorption of Lysozyme on Nanodiamonds in Aqueous Suspensions

Vervald

Burikov

et al. 2020

J. Phys. Chem. C

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“…Properties of CNPs are largely defined by the processes occurring at the interface between nanoparticles and their environment. Like that, for both nanodiamonds (NDs) and carbon dots (CDs), the structure of surface groups and peculiarities of their interactions with surrounding molecules influence the colloidal stability − of nanoparticles and their adsorption properties − and biocompatibility. − …”

Section: Introductionmentioning

confidence: 99%

Surface Photoluminescence of Oxidized Nanodiamonds: Influence of Environment pH

et al. 2021

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Nanoparticles’ environment, in particular pH, can strongly affect their photoluminescence (PL). This can be especially true for the surface PL of nanodiamonds (NDs) known to be dependent on the composition of surface groups. In this paper, the effect of environmental pH in the range from 2 to 12.5 on the surface photoluminescence of oxidized NDs of various syntheses and surface treatments was investigated. For the first time, the varying changes of the NDs’ PL with the pH were shown, having, however, an essential common feature: they were observed in the same pH regions from 2 to 5 and from 9 to 12.5, while in the pH region from 5 to 9, the PL intensity of all samples was almost constant. Obtained dependences of NDs’ ζ-potentials on pH and quantum mechanical modeling showed that all changes of NDs’ PL are due to the (de)protonation of surface groups: carboxyl at pH from 2 to 5 and hydroxyl on sp2-hybridized carbon at pH from 9 to 12.5. The varying response of NDs’ PL to such deprotonation shows the possibility of tuning the surface photoluminescence of NDs for use in industry and biomedicine beyond what is possible by only controlling the nanodiamonds’ surface groups.

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“…The result revealed that the thermal conductivity of the nanoPCM increases from 0.246 to 1.346 W/m K because of the continuous thermal conductive pathways formed by coating silver. Nanodiamonds (NDs) are zero-dimensional carbon-based materials with illustrious mechanical properties, biocompatibility, and high thermal conductivity. , In addition, owing to the fact that NDs also have a variety of chemically active surfaces and are widely used in various aspects, − especially as functional particles, NDs are often applied to multifunctional materials.…”

Section: Introductionmentioning

confidence: 99%

“…Nanodiamonds (NDs) are zero-dimensional carbon-based materials with illustrious mechanical properties, biocompatibility, and high thermal conductivity. 28,29 In addition, owing to the fact that NDs also have a variety of chemically active surfaces and are widely used in various aspects, 30−32 especially as functional particles, NDs are often applied to multifunctional materials. The methods for preparing phase-change microcapsules mainly include the interfacial polymerization method, 33 emulsion polymerization method, 34 in situ polymerization method, 35 and sol−gel method.…”

Section: ■ Introductionmentioning

confidence: 99%

Nanodiamond-Modified Microencapsulated Phase-Change Materials with Superhydrophobicity and High Light-to-Thermal Conversion Efficiency

Zhao

et al. 2020

Ind. Eng. Chem. Res.

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A series of novel paraffin (Pn)@nanodiamond (ND)/melamine formaldehyde microencapsulated phase-change materials (microPCMs) with superhydrophobicity and high lightto-thermal conversion efficiency were synthesized through in situ polymerization. ND, acting as a kind of thermally conductive particle, was situated at the interface between the core and the shell. We have investigated the effect of different ND contents on the morphology, microstructure, and properties of microPCMs through scanning electron microscopy, Fourier-transform infrared spectroscopy, differential scanning calorimetry, thermal conductivity test, paraffin leakage rate test, photothermal conversion test, and contact angle (CA) measurements. The results show that the thermal conductivity of microPCMs with ND was significantly improved. The microPCMs exhibited appropriate phase-change temperatures and achieved a high-encapsulation efficiency. Moreover, the water CA of microPCMs was 159.9°, which displayed superhydrophobic properties. When the dose of ND was 6 g/L, the light-to-thermal conversion efficiency of microPCMs was up to 64.7%, greatly improving the light-to-thermal conversion performance. Thus, the microPCMs with high light-to-thermal conversion performance and superior superhydrophobic property might be a potential material for energy conversion and hydrophobicity.

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Nanodiamonds and surfactants in water: Hydrophilic and hydrophobic interactions

Cited by 27 publications

References 47 publications

Bilayer Adsorption of Lysozyme on Nanodiamonds in Aqueous Suspensions

Bilayer Adsorption of Lysozyme on Nanodiamonds in Aqueous Suspensions

Surface Photoluminescence of Oxidized Nanodiamonds: Influence of Environment pH

Nanodiamond-Modified Microencapsulated Phase-Change Materials with Superhydrophobicity and High Light-to-Thermal Conversion Efficiency

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