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Super-stable, solvent-resistant and uniform lignin nanorods and nanospheres with a high yield in a mild and facile process
Green Chemistry ( IF 9.3 ) Pub Date : 2020-11-17 , DOI: 10.1039/d0gc02887h Weikun Jiang 1, 2, 3, 4, 5 , Shuyun Liu 1, 2, 3, 4 , Chaojun Wu 1, 2, 3, 4, 5 , Yu Liu 1, 2, 3, 4 , Guihua Yang 1, 2, 3, 4 , Yonghao Ni 5, 6, 7, 8
Green Chemistry ( IF 9.3 ) Pub Date : 2020-11-17 , DOI: 10.1039/d0gc02887h Weikun Jiang 1, 2, 3, 4, 5 , Shuyun Liu 1, 2, 3, 4 , Chaojun Wu 1, 2, 3, 4, 5 , Yu Liu 1, 2, 3, 4 , Guihua Yang 1, 2, 3, 4 , Yonghao Ni 5, 6, 7, 8
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Lignin-based nanomaterials have attracted much attention in value-added functional material fields due to their green/sustainable nature; however, it is a challenge to control the morphology of lignin nanoparticles, and furthermore, to make them stable in organic solvent systems. Herein, for the first time we developed a green and simple approach for producing lignin nanorods, in addition to lignin nanospheres, both of which are stable in various organic solvents. The preparation process involves two steps: (1) lignosulfonate (LS) is fractionated into three fractions, namely, LS90, LS70, and LS40 using 90% ethanol, 70% ethanol and 40% ethanol sequentially; (2) lignin nanorods are obtained from the LS40 fraction, while lignin nanospheres are obtained from LS70 by an anti-solvent method. During the lignin self-assembly process, for the LS40 fraction, the lignin structures are in a flat oblate ellipsoid conformation, and the J-aggregation of their aromatic structures occurs on the flat sides of the oblate ellipsoid, leading to the formation of lignin nanorods. In contrast, for the LS70 fraction, lignin aggregation occurs randomly because of its near-spherical small ellipsoid conformation in solution, leading to the formation of lignin nanospheres. The entire preparation process of lignin nanorods and lignin nanospheres is simple, without the use of templates, complex chemical reactions and rigorous conditions. The lignin nanorods and lignin nanospheres exhibit excellent uniformity and dispersibility, and long-term stability in various organic solvents. This study not only presents a green, facile and economical approach for preparing lignin nanorods, as well as lignin nanospheres, but also provides a promising new value-added utilization pathway for lignosulfonate.
中文翻译：
超稳定，耐溶剂且均匀的木质素纳米棒和纳米球，在温和且简便的过程中产率高
木质素基纳米材料因其绿色/可持续性而在增值功能材料领域引起了广泛关注。然而，控制木质素纳米颗粒的形态并使其在有机溶剂体系中稳定是一个挑战。在本文中，除了木质素纳米球外，我们首次开发了一种绿色简单的生产木质素纳米棒的方法，两者在各种有机溶剂中均稳定。制备过程包括两个步骤：（1）依次使用90％乙醇，70％乙醇和40％乙醇将木质素磺酸盐（LS）分为三部分，即LS90，LS70和LS40。（2）木质素纳米棒由LS40级分获得，而木质素纳米球由LS70通过反溶剂法获得。在木质素自组装过程中，对于LS40馏分，木质素结构呈扁平的扁椭圆形构象，其芳族结构的J聚集发生在扁椭圆形的扁平侧，导致木质素纳米棒的形成。相反，对于LS70级分，木质素由于其在溶液中接近球形的小椭球构象而随机发生聚集，从而导致木质素纳米球的形成。木质素纳米棒和木质素纳米球的整个制备过程很简单，无需使用模板，复杂的化学反应和严格的条件。木质素纳米棒和木质素纳米球在各种有机溶剂中显示出优异的均匀性和分散性，以及长期稳定性。这项研究不仅提出了一种绿色，简便且经济的方法来制备木质素纳米棒以及木质素纳米球，
更新日期：2020-11-27
中文翻译：
超稳定，耐溶剂且均匀的木质素纳米棒和纳米球，在温和且简便的过程中产率高
木质素基纳米材料因其绿色/可持续性而在增值功能材料领域引起了广泛关注。然而，控制木质素纳米颗粒的形态并使其在有机溶剂体系中稳定是一个挑战。在本文中，除了木质素纳米球外，我们首次开发了一种绿色简单的生产木质素纳米棒的方法，两者在各种有机溶剂中均稳定。制备过程包括两个步骤：（1）依次使用90％乙醇，70％乙醇和40％乙醇将木质素磺酸盐（LS）分为三部分，即LS90，LS70和LS40。（2）木质素纳米棒由LS40级分获得，而木质素纳米球由LS70通过反溶剂法获得。在木质素自组装过程中，对于LS40馏分，木质素结构呈扁平的扁椭圆形构象，其芳族结构的J聚集发生在扁椭圆形的扁平侧，导致木质素纳米棒的形成。相反，对于LS70级分，木质素由于其在溶液中接近球形的小椭球构象而随机发生聚集，从而导致木质素纳米球的形成。木质素纳米棒和木质素纳米球的整个制备过程很简单，无需使用模板，复杂的化学反应和严格的条件。木质素纳米棒和木质素纳米球在各种有机溶剂中显示出优异的均匀性和分散性，以及长期稳定性。这项研究不仅提出了一种绿色，简便且经济的方法来制备木质素纳米棒以及木质素纳米球，
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