Chen Ziyong, Xu Yangzi, Shivkumar Satya
Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA.
J Sci Food Agric. 2018 Feb;98(3):1061-1070. doi: 10.1002/jsfa.8556. Epub 2017 Aug 28.
Rice husk is a complex hierarchical assembly of hollow fibers consisting of cellulose, hemicellulose and lignin. In addition, it can also contain pectin and significant amounts of silica. Rice husk can be used in diverse applications and generally in the form of rice husk powder. This study aimed to investigate the structural features and mechanical properties of various varieties of whole rice husks.
Rice husk consists of three sections: epidermis, sub-hypodermis and hypodermis. The thickness of these layers, the diameters of the hollow fibers and the wall thickness vary with the variety of rice husk. The elastic modulus is typically between 0.3 and 2.6 GPa, and the ultimate tensile strength varies from 19 to 135 MPa depending on the variety of rice husk.
Rice husk has a unique hierarchical structure in which the fibers exhibit a staggered perpendicular arrangement and the entire fiber sections are covered by an external shell. The tensile properties vary with the variety of rice husk. The wide range in these tensile properties may be attributed to the size and orientation of the fibers. © 2017 Society of Chemical Industry.
稻壳是由纤维素、半纤维素和木质素组成的中空纤维的复杂分层集合体。此外，它还可能含有果胶和大量二氧化硅。稻壳可用于多种应用，通常以稻壳粉的形式使用。本研究旨在研究不同品种的完整稻壳的结构特征和力学性能。
稻壳由三个部分组成：表皮、亚下表皮和下表皮。这些层的厚度、中空纤维的直径和壁厚随稻壳品种的不同而变化。弹性模量通常在0.3至2.6吉帕之间，极限抗拉强度根据稻壳品种的不同在19至135兆帕之间变化。
稻壳具有独特的分层结构，其中纤维呈交错垂直排列，整个纤维部分被外壳覆盖。拉伸性能随稻壳品种的不同而变化。这些拉伸性能的广泛差异可能归因于纤维的尺寸和取向。©2017化学工业协会。
