Hot Exfoliation
Hot Exfoliation - Related Videos
10:13
Working with Hot and Cold Sources
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2023
Source: Robert M. Rioux & Suprita Jharimune, Pennsylvania State University, University Park, PA Working with extreme temperatures, both high and low, is an integral part of many laboratory operations. For many, mentioning a laboratory instantly evokes the mental picture of a Bunsen burner. Bunsen burners and hot plates are used extensively in small and large operations in research laboratories and industries, thus making it necessary for all users to be aware of their safe handling...
08:54
Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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Cited by 3 •
2016
A two dimensional model material of discotic zirconium phosphate was developed. The inorganic crystal with lamellar structure was synthesized by hydrothermal, reflux, and microwave-assisted methods. On exfoliation with organic molecules, layered crystals can be converted to monolayers, and nematic liquid crystal phase was formed at sufficient concentration of monolayers.
09:17
Hot Wire Anemometry
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2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI Hot-wire anemometers have a very short time-response, which makes them ideal to measure rapidly fluctuating phenomena such as turbulent flows. The purpose of this experiment is to demonstrate the use of hot-wire anemometry.
10:41
Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol
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Cited by 38 •
2016
A protocol for the liquid exfoliation of layered materials to nanosheets, their size selection and size measurement by microscopic and spectroscopic techniques is presented.
12:04
Exfoliation of Egyptian Blue and Han Blue, Two Alkali Earth Copper Silicate-based Pigments
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Cited by 34 •
2014
The preparation and exfoliation of CaCuSi4O10 and BaCuSi4O10 are described. Upon stirring in hot water, CaCuSi4O10 spontaneously exfoliates into monolayers, whereas BaCuSi4O10 requires ultrasonication in organic solvents. Near infrared (NIR) imaging illustrates the NIR emission properties of these materials, and aqueous dispersions of these nanomaterials are useful for solution processing.
FAQs
The key driving event is gas generation inside the layered structure. Heating can decompose intercalated species or groups attached to the surface, and the resulting gases expand rapidly between sheets. This expansion increases layer spacing and helps overcome interlayer forces, allowing the solid to separate into thinner sheets or nanoscale flakes.
Rapid expansion creates mechanical pressure within the layered material rather than relying only on external separation. As gases form and expand, the distance between neighboring sheets increases, weakening the interactions that hold them together. This balance between gas generation, layer spacing, and interlayer forces determines whether thermal treatment produces substantial exfoliation.
The approach is suited to layered solids that contain intercalated species or surface-bound groups capable of decomposing during heating. Graphite-derived compounds are important examples, but the broader material class includes other layered solids. Their response depends on whether heating can generate enough gas and expansion to separate the stacked sheets.
A chemistry-focused workflow follows the material through heating, decomposition of intercalated or surface-bound species, gas formation, and rapid expansion between layers. The expanding gases increase sheet separation until interlayer forces are overcome. This sequence explains why thermal treatment can transform a layered starting solid into thinner, high-surface-area products.
Exfoliation can produce materials with increased surface area and altered electrical, mechanical, and chemical properties. These changes arise from converting a stacked layered solid into thinner sheets or nanoscale flakes. The resulting combination of accessible surface and modified behavior makes the products useful for designing advanced functional materials.
The method supports preparation of materials for sensors, catalysts, and energy-storage components. Its value in these areas comes from producing high-surface-area products with changed electrical, mechanical, and chemical behavior. Researchers can therefore use thermal exfoliation as a materials-preparation step when developing functional structures for these application areas.