当前位置：
X-MOL 学术
›
ACS Sustain. Chem. Eng.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
High Value Use of Technical Lignin. Fractionated Lignin Enables Facile Synthesis of Microcapsules with Various Shapes: Hemisphere, Bowl, Mini-tablets, or Spheres with Single Holes
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-08-04 , DOI: 10.1021/acssuschemeng.0c03521 Yuxiao Cui 1 , Martin Lawoko 1 , Anna J. Svagan 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-08-04 , DOI: 10.1021/acssuschemeng.0c03521 Yuxiao Cui 1 , Martin Lawoko 1 , Anna J. Svagan 1
Affiliation
|
Anisotropic carbon-rich microcapsule morphologies are of great value in many applications including catalysis, energy storage, biomedicine, and osmosis-triggered drug delivery, due to an observed shape effect. However, high-precision synthesis, to generate large yields of well-defined anisotropic shapes, is generally challenging. Here, we show for the first time that a modified carbon-rich waste-material, a fractionated and acetylated Kraft lignin, enables facile production of large amounts of well-defined “acorn-like” microcapsules with heterogeneous shell thicknesses. This is due to the inherent physicochemical properties of the fractionated lignin at the oil/water (O/W) interface. The acorn-shape is strongly related to two distinct lignin-molecule populations, that phase separate during microcapsule formation. Fine-tuning the post-treatment conditions (pressure or hydrothermal temperature) results in a number of different microcapsule shapes; hemisphere, bowl, mini-tablets, or spheres with single holes. Further chemical modification to their surfaces is also demonstrated. The present study provides a new library of shape-anisotropic carbon-rich building blocks that open new avenues for assembling hierarchical material with a high level of complexity.
中文翻译：
高价值使用技术木质素。分级木质素可方便地合成具有各种形状的微胶囊：半球，碗状，微型片剂或单孔球形
由于观察到的形状效应，各向异性的富含碳的微胶囊形态在许多应用中具有重要价值，包括催化，能量存储，生物医学和渗透触发的药物输送。然而，高精度合成以产生高产率的明确定义的各向异性形状通常具有挑战性。在这里，我们首次展示了改性的富含碳的废料，一种经过分馏和乙酰化的卡夫木质素，能够轻松生产大量具有不同外壳厚度的明确定义的“橡子状”微胶囊。这是由于分馏木质素在油/水（O / W）界面处固有的物理化学性质。橡子形状与两个不同的木质素分子种群密切相关，在微胶囊形成过程中它们是相分离的。微调后处理条件（压力或水热温度）会导致许多不同的微胶囊形状；半球，碗，迷你平板电脑或带单孔的球。还证明了对其表面的进一步化学改性。本研究提供了一个新的形状各向异性的富碳积木库，为组装具有高度复杂性的分层材料开辟了新途径。
更新日期：2020-09-08
中文翻译：
高价值使用技术木质素。分级木质素可方便地合成具有各种形状的微胶囊：半球，碗状，微型片剂或单孔球形
由于观察到的形状效应，各向异性的富含碳的微胶囊形态在许多应用中具有重要价值，包括催化，能量存储，生物医学和渗透触发的药物输送。然而，高精度合成以产生高产率的明确定义的各向异性形状通常具有挑战性。在这里，我们首次展示了改性的富含碳的废料，一种经过分馏和乙酰化的卡夫木质素，能够轻松生产大量具有不同外壳厚度的明确定义的“橡子状”微胶囊。这是由于分馏木质素在油/水（O / W）界面处固有的物理化学性质。橡子形状与两个不同的木质素分子种群密切相关，在微胶囊形成过程中它们是相分离的。微调后处理条件（压力或水热温度）会导致许多不同的微胶囊形状；半球，碗，迷你平板电脑或带单孔的球。还证明了对其表面的进一步化学改性。本研究提供了一个新的形状各向异性的富碳积木库，为组装具有高度复杂性的分层材料开辟了新途径。
京公网安备 11010802027423号