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Rapid Preparation of Cellulose Nanofibers from Energy Cane Bagasse and Their Application as Stabilizer and Rheological Modifiers in Magnetorheological Fluid
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-02 , DOI: 10.1021/acssuschemeng.0c02904 Chaozheng Liu 1, 2 , Mei-Chun Li 1 , Changtong Mei 1 , Wangwang Xu 2 , Qinglin Wu 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-02 , DOI: 10.1021/acssuschemeng.0c02904 Chaozheng Liu 1, 2 , Mei-Chun Li 1 , Changtong Mei 1 , Wangwang Xu 2 , Qinglin Wu 2
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Magnetorheological fluids (MRFs) are smart fluids made of magnetic particles in a viscous carrier fluid, and their rheological properties are controllable by an external magnetic field. However, MRFs suffer from serious sedimentation and redispersibility problems, which limit their effectiveness and feasibility in a wide variety of applications. Herein, we present a novel strategy to improve magnetorheological property and stability of MRFs using cellulose nanofibers (CNFs), rapidly prepared from energy cane bagasse using microwave-assisted alkali-H2O2 and ultrasonic treatment. High delignification rate of 94.3% was achieved by the microwave treatment for 15 min. Chemical structure analysis revealed that the removal of lignin and carboxylation of cellulose occurred simultaneously. The obtained CNFs exhibited a highly entangled network structure, and their suspension showed the gel-like viscoelastic behavior. In CNF-MRF, the magnetic particles were entrapped and suspended by the entangled network of CNFs, which is due to the physical entanglement and the electrostatic repulsion force between Fe3O4 and CNFs. CNFs helped suspend magnetic particles in CNF-MRFs, leading to improved stability and magnetorheological properties (i.e., viscosity stability after cycling, reversible rate of 95.57% after 100 cycles). This work demonstrates a new path for the production of CNFs from energy cane bagasse wastes and their value-added utilization in MRFs.
中文翻译：
能量甘蔗渣快速制备纤维素纳米纤维及其在磁流变液中的稳定剂和流变改性剂的应用
磁流变流体（MRF）是由粘性载流体中的磁性颗粒制成的智能流体，其流变特性可通过外部磁场控制。然而，MRF存在严重的沉降和再分散性问题，这限制了它们在多种应用中的有效性和可行性。在这里，我们提出了一种新的策略，可以使用纤维素纳米纤维（CNF）提高微波流变的磁流变性能和稳定性，该纤维素纳米纤维是使用微波辅助碱H 2 O 2从蔗糖蔗渣中快速制备的和超声波处理。通过微波处理15分钟可以达到94.3％的高脱木素率。化学结构分析表明，木质素的去除和纤维素的羧化同时发生。所获得的CNF显示出高度纠缠的网络结构，并且其悬浮液显示出凝胶状的粘弹性行为。在CNF-MRF中，磁性颗粒被CNF的纠缠网络截留和悬浮，这是由于Fe 3 O 4之间的物理纠缠和静电排斥力引起的和CNF。CNFs帮助磁性颗粒悬浮在CNF-MRFs中，从而提高了稳定性和磁流变性能（例如，循环后的粘度稳定性，100次循环后可逆率为95.57％）。这项工作展示了从甘蔗渣中生产CNF的新途径，以及它们在MRF中的增值利用。
更新日期：2020-07-27
中文翻译：
能量甘蔗渣快速制备纤维素纳米纤维及其在磁流变液中的稳定剂和流变改性剂的应用
磁流变流体（MRF）是由粘性载流体中的磁性颗粒制成的智能流体，其流变特性可通过外部磁场控制。然而，MRF存在严重的沉降和再分散性问题，这限制了它们在多种应用中的有效性和可行性。在这里，我们提出了一种新的策略，可以使用纤维素纳米纤维（CNF）提高微波流变的磁流变性能和稳定性，该纤维素纳米纤维是使用微波辅助碱H 2 O 2从蔗糖蔗渣中快速制备的和超声波处理。通过微波处理15分钟可以达到94.3％的高脱木素率。化学结构分析表明，木质素的去除和纤维素的羧化同时发生。所获得的CNF显示出高度纠缠的网络结构，并且其悬浮液显示出凝胶状的粘弹性行为。在CNF-MRF中，磁性颗粒被CNF的纠缠网络截留和悬浮，这是由于Fe 3 O 4之间的物理纠缠和静电排斥力引起的和CNF。CNFs帮助磁性颗粒悬浮在CNF-MRFs中，从而提高了稳定性和磁流变性能（例如，循环后的粘度稳定性，100次循环后可逆率为95.57％）。这项工作展示了从甘蔗渣中生产CNF的新途径，以及它们在MRF中的增值利用。
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