Multi-fractal structure features of corn stalks and their correlation with pretreatment homogeneity and efficacy.
Multi-fractal structure features of corn stalks and their correlation with pretreatment homogeneity and efficacy.
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DOI：
10.2139/ssrn.3957215
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发表时间：
2021-12
影响因子：
11.4
通讯作者：
Wenjie Sui;Xiaodan Zhou;Hao Su;Guanhua Wang;Wei Jiang;R. Liu;Tao Wu;Shuai Wang;Yan Jin
中科院分区：
文献类型：
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作者：
Wenjie Sui;Xiaodan Zhou;Hao Su;Guanhua Wang;Wei Jiang;R. Liu;Tao Wu;Shuai Wang;Yan Jin
木质纤维素生物质是一种具有分形特征的天然多孔介质，分形特征在经过一定预处理后趋于明显，并与加工效果有关。采用数字图像处理和压汞孔隙度法，系统表征了蒸汽爆炸预处理后玉米秸秆的多尺度分形特征。宏观表面分形特征（Ds: 2.8278 ~ 2.8523）和微观孔隙分形特征（Dp: 2.3003 ~ 2.8867）随预处理程度的变化趋势相同，揭示了玉米秸秆加工结果与尺度的自相似性。分形维数的减小与预处理的均一性和有效性有关，其对应的是形态均一且结构复杂的样品，其结构组分具有较好的自水解程度，因此与酶的反应性较高。在定量上，分形维数与酶消化率呈显著的线性相关，r2为>0.95。期望分形维数能从理论上指导生物炼制关键预处理技术的合理评价、预测和推广。
Lignocellulose biomass is a natural porous medium with fractal characteristics, which tend to be distinct after certain pretreatment and relational with processing effects. In this work, multi-scale fractal features of corn stalks after steam explosion pretreatment were systematically characterized employing digital image processing and mercury intrusion porosimetry methodologies. The macroscopic surface fractal features (Ds: 2.8278∼2.8523) and microscopic pore fractal features (Dp: 2.3003∼2.8867) presented same variation tendency with pretreatment severity, revealing the self-similarity of processing results of corn stalks with the scale. In association with pretreatment homogeneity and efficacy, the decrease in fractal dimensions corresponded to morphologically homogeneous and structurally complex samples with preferable auto-hydrolysis degree of structural components, which led to high reactivity with enzymes. Quantitatively, there were strongly linear correlation between fractal dimensions and enzymatic digestibility with r2>0.95. Fractal dimension was expected to theoretically guide the rational evaluation, prediction and promotion of the key pretreatment technique in biorefinery.