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By Levy Shaked

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A discrepancy in the size of the crystalline regions of cellulose, obtained by X-ray diffractometry and electron microscopy, led to differing concepts on the molecular organisation of micro-fibrils. David et al. [38] regarded the microfibril itself as being made up of a number of crystallites, each of which was separated by a para-crystalline region and later termed “elementary fibril”. The term “elementary fibril” is therefore applied to the smallest cellulosic strand. Electron micrograph studies of the disintegrated microfibrils, Amorphous Region Acid Hydrolysis Crystalline Region Nanocrystals Fig.

However, the ordered regions are extensively distributed throughout the material, and these regions are called crystallites. The threadlike entity, which arises from the linear association of these components, is called the microfibril. It forms the basic structural unit of the plant cell wall. These microfibrils are found to be 10–30 nm wide, less than this in width, indefinitely long containing 2–30,000 cellulose molecules in cross section. Their structure consists of predominantly crystalline cellulose core.

8 Morphology of hemp fibre surface detailing the rough primary cell wall [41] Fig. 9 Interaction of water with hemp fibre demonstrating the hydrophobic nature of hemp fibre [42] 18 S. Thomas et al. Fig. 10 Cross-section of an Agave leaf coloured with Carmin-green [43] Fig. 11 Fluorescent microscopy images of agave fibre [43] is clear that the fibre is sensitive to calcofluor due to the presence of cellulose, hemicellulose and pectic substances. The study was further supported by SEM studies. SEM studies revealed that agave fibres gathered in a bundle form and constituted spiral tracheids, well-known as water transport materials.

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A Transform Domain Hardcopy Watermarking Scheme by Levy Shaked

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