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Interpretation on Nanoporous Network Structure in Rice Husk Silica Layer: A Graph Model
ACS Omega ( IF 3.7 ) Pub Date : 2018-09-20 00:00:00 , DOI: 10.1021/acsomega.8b01453
Won Jun Lee 1, 2 , Steven L Bernasek 3 , Chong Soo Han 1
Affiliation  

The rice plant produces an amorphous silica layer in the husk covering the brown rice grain as a part of a protective respiration system. The layer shows high permeation molecular flow while the Brunauer–Emmett–Teller isotherm indicates the existence of nanometer-sized pores. Here, we interpret the inner structure of the layer as a porous network consisting of void spheres with a degree of 2–5 and tunnels with a length of 2–7 nm based on the transmission electron microscopy images. In the network, the gas molecules travel through the tunnels and move in random directions after collisions with the walls of the spheres. A tree network was introduced to understand the permeance of the layer and the reflection of the molecule of the root or parent sphere was estimated for a specific case. The tree becomes a graph with cycles in a finite space such as the silica layer and the reflection of the root sphere in the graph converses to that of the tree. On the basis of the properties of the network, the high permeance of the silica layer in the rice husk can be explained. It is suggested that the specific system restricts the movements of the gas molecules and can be applied to reduce the size of gas phase separation and chemical reactor systems providing a new view to understand nanoscaled porous materials.

中文翻译:

稻壳二氧化硅层纳米孔网络结构的解释:图模型

水稻植株在稻壳中产生一层无定形二氧化硅层,覆盖在糙米粒上,作为保护性呼吸系统的一部分。该层显示出高渗透分子流,而 Brunauer-Emmett-Teller 等温线表明存在纳米尺寸的孔隙。在这里,我们根据透射电子显微镜图像将层的内部结构解释为由度为 2-5 的空隙球和长度为 2-7 nm 的隧道组成的多孔网络。在网络中,气体分子穿过隧道,并在与球体壁碰撞后沿随机方向移动。引入树网络来了解层的渗透性,并针对特定情况估计根或母体分子的反射。树变成了在有限空间(例如二氧化硅层)中具有循环的图,并且图中根球体的反射与树的反射相反。根据网络的特性,可以解释稻壳中二氧化硅层的高渗透性。研究表明,该特定系统限制了气体分子的运动,可用于减小气相分离和化学反应器系统的尺寸,为理解纳米级多孔材料提供了新的视角。
更新日期:2018-09-20
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