Li Yidian, Xie Mengling, Liu Yang, Zhao Hui
Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China.
Guangzhou Vocational and Technical University of Science and Technology, Guangzhou 510550, China.
ACS Omega. 2025 Aug 14;10(33):37617-37627. doi: 10.1021/acsomega.5c04010. eCollection 2025 Aug 26.
A critical gap remains in understanding how fiber rheological properties govern bubble dynamics within suspensions, which is a key factor in fiber-based foam formation and performance. This study systematically explores the effects of bagasse fibrillated fiber (BFF) aspect ratio, concentration, and cationic polyacrylamide (CPAM) addition on suspension rheology and bubble behavior. BFF was prepared using an ultrafine grinder, followed by centrifugal fractionation to obtain fibers with controlled aspect ratios. Experimental analyses combined with molecular dynamics (MD) simulations revealed correlations among fiber aspect ratio, concentration, and suspension rheology. The results show that (1) increasing BFF aspect ratio and concentration enhances suspension viscosity, yield stress, and fiber networking, suppressing lateral bubble motion and deformation; (2) BFF concentrations exceeding 0.2 wt % exhibit inconsistent stabilization due to multiscale fiber heterogeneity; and (3) CPAM above 0.5 g/L consistently improves bubble shape/size stability by strengthening fiber cross-linking via electrostatic interactions. These findings provide theoretical and practical insights into designing aqueous fiber foams with applications in sustainable packaging, sound insulation, and thermal management.
在理解纤维流变特性如何控制悬浮液中的气泡动力学方面，仍然存在一个关键差距，而这是基于纤维的泡沫形成和性能的一个关键因素。本研究系统地探讨了蔗渣原纤化纤维（BFF）的长径比、浓度以及阳离子聚丙烯酰胺（CPAM）的添加对悬浮液流变学和气泡行为的影响。使用超细研磨机制备BFF，然后通过离心分级获得具有可控长径比的纤维。结合分子动力学（MD）模拟的实验分析揭示了纤维长径比、浓度和悬浮液流变学之间的相关性。结果表明：（1）增加BFF的长径比和浓度会提高悬浮液的粘度、屈服应力和纤维网络结构，抑制气泡的横向运动和变形；（2）由于多尺度纤维异质性，BFF浓度超过0.2 wt%时表现出不稳定的稳定性；（3）高于0.5 g/L的CPAM通过静电相互作用加强纤维交联，持续改善气泡形状/尺寸稳定性。这些发现为设计水性纤维泡沫提供了理论和实践见解，水性纤维泡沫可应用于可持续包装、隔音和热管理领域。
