Aggregation behavior of nanodiamonds and their functionalized analogs in an aqueous environment

Chintal Desai; Kun Chen; Somenath Mitra

doi:10.1039/c3em00378g

Aggregation behavior of nanodiamonds and their functionalized analogs in an aqueous environment

Chintal Desai, Kun Chen, Somenath Mitra

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34 Scopus citations

Abstract

The colloidal behavior of aqueous dispersions of detonation nanodiamonds (DNDs) and carboxylated nanodiamonds (DND-COOH) which were synthesized via a microwave process is presented. Both forms of DNDs were found to be relatively stable in aqueous solutions, but aggregated rapidly in the presence of mono and divalent salts. The critical coagulation concentration (CCC) values for DNDs and DND-COOH were estimated to be between 8 and 10 mM for NaCl and 7 and 8 mM for MgCl₂. In general, the formation of carboxyl groups on the DND surface did not alter colloidal behavior as dramatically as it is known to do for other nanocarbons especially carbon nanotubes.

Original language	English (US)
Pages (from-to)	518-523
Number of pages	6
Journal	Environmental Sciences: Processes and Impacts
Volume	16
Issue number	3
DOIs	https://doi.org/10.1039/c3em00378g
State	Published - Mar 2014

All Science Journal Classification (ASJC) codes

Environmental Chemistry
Public Health, Environmental and Occupational Health
Management, Monitoring, Policy and Law

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abstract = "The colloidal behavior of aqueous dispersions of detonation nanodiamonds (DNDs) and carboxylated nanodiamonds (DND-COOH) which were synthesized via a microwave process is presented. Both forms of DNDs were found to be relatively stable in aqueous solutions, but aggregated rapidly in the presence of mono and divalent salts. The critical coagulation concentration (CCC) values for DNDs and DND-COOH were estimated to be between 8 and 10 mM for NaCl and 7 and 8 mM for MgCl2. In general, the formation of carboxyl groups on the DND surface did not alter colloidal behavior as dramatically as it is known to do for other nanocarbons especially carbon nanotubes.",

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AB - The colloidal behavior of aqueous dispersions of detonation nanodiamonds (DNDs) and carboxylated nanodiamonds (DND-COOH) which were synthesized via a microwave process is presented. Both forms of DNDs were found to be relatively stable in aqueous solutions, but aggregated rapidly in the presence of mono and divalent salts. The critical coagulation concentration (CCC) values for DNDs and DND-COOH were estimated to be between 8 and 10 mM for NaCl and 7 and 8 mM for MgCl2. In general, the formation of carboxyl groups on the DND surface did not alter colloidal behavior as dramatically as it is known to do for other nanocarbons especially carbon nanotubes.

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Aggregation behavior of nanodiamonds and their functionalized analogs in an aqueous environment

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