Thin films, papers, or foils produced from graphene‐based materials have been the focus of considerable research interest in recent years. They have a range of applications including energy storage, selective filtration of liquids, and gas storage. For all of these applications, the critical attribute of the films is their pore volume. However, there remains a considerable challenge around characterizing the accessible microscopic surface area of the materials in their intended state of application. In this work, an image‐processing‐based approach is presented for estimating the lower threshold of specific surface area for graphene‐based films that have a typical multilayered structure. Canny edge detection is used together with tortuosity measurements to infer sheet areas from layer edges. The method serves as a simple independent characterization technique. Specific surface area values predicted for a range of similar films vary by less than 4× the reported values, which vary by >1.1×103 in range.
DiscussionTotal gossypol determined in a modification of the method of Carruth (8) of meal 1578 was 1.102 per cent, of which free gossypol on the air-dry sample 'constituted 4.82 per cent; with the meal conditioned, the free gossypol constituted 11.87 per cent of the total, or an increase of 7.05 per cent due to the change in moisture content of the meal and to extraction with ether saturated with water.Gossypol is considered to exist in cottonseed meal in two forms, free and bound, being distinguished by their difference in solubility in ether. By the process of condensing steam or merely by the addition of moisture uniformly distributed in the meal, there is a loosening of the gossypol in some manner so that it can be extracted in greater quantity by moist ether
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