NDLI: Thermodynamic approach to boron nitride nanotube solubility and dispersion

Content Provider	Royal Society of Chemistry (RSC)
Author	Silva, R. Park, C. Tiano, A. L. Applin, S. I. Tsui, M. Fay, C. C. Gibbons, L.
Copyright Year	2016
Abstract	Inadequate dispersion of nanomaterials is a critical issue that significantly limits the potential properties of nanocomposites and when overcome, will enable further enhancement of material properties. The most common methods used to improve dispersion include surface functionalization, surfactants, polymer wrapping, and sonication. Although these approaches have proven effective, they often achieve dispersion by altering the surface or structure of the nanomaterial and ultimately, their intrinsic properties. Co-solvents are commonly utilized in the polymer, paint, and art conservation industries to selectively dissolve materials. These co-solvents are utilized based on thermodynamic interaction parameters and are chosen so that the original materials are not affected. The same concept was applied to enhance the dispersion of boron nitride nanotubes (BNNTs) to facilitate the fabrication of BNNT nanocomposites. Of the solvents tested, dimethylacetamide (DMAc) exhibited the most stable, uniform dispersion of BNNTs, followed by N,N-dimethylformamide (DMF), acetone, and N-methyl-2-pyrrolidone (NMP). Utilizing the known Hansen solubility parameters of these solvents in comparison to the BNNT dispersion state, a region of good solubility was proposed. This solubility region was used to identify co-solvent systems that led to improved BNNT dispersion in poor solvents such as toluene, hexane, and ethanol. Incorporating the data from the co-solvent studies further refined the proposed solubility region. From this region, the Hansen solubility parameters for BNNTs are thought to lie at the midpoint of the solubility sphere: 16.8, 10.7, and 9.0 MPa1/2 for δd, δp, and δh, respectively, with a calculated Hildebrand parameter of 21.8 MPa1/2.
Starting Page	4348
Ending Page	4359
Page Count	12
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	8
Issue Number	7
Journal	Nanoscale
DOI	10.1039/c5nr08259e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hansen Hildebrand Sonication Dimethylformamide Ethanol Toluene Nanomaterials Polymer Adolf von Hildebrand London dispersion force NMP N-Methyl-2-pyrrolidone Hansen solubility parameter Hexane Nitride Dimethylacetamide Conservation-restoration of cultural heritage Acetone
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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