Understanding nanocellulose chirality and structure-properties relationship at the single fibril level.
Understanding nanocellulose chirality and structure-properties relationship at the single fibril level.
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DOI：
10.1038/ncomms8564
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发表时间：
2015-06-25
影响因子：
16.6
通讯作者：
Mezzenga, Raffaele
中科院分区：
文献类型：
--
作者：
Usov, Ivan;Nystroem, Gustav;Adamcik, Jozef;Handschin, Stephan;Schutz, Christina;Fall, Andreas;Bergstrom, Lennart;Mezzenga, Raffaele
纳米纤维素原纤维在自然界和纳米技术中普遍存在，但其介观结构组装尚未完全理解。在这里，我们研究了棒状纤维素纳米粒子的结构特征，在一个单一的颗粒水平上，通过应用统计聚合物物理概念的电子和原子力显微镜图像，我们评估其物理性质，通过定量纳米力学映射。我们显示右手手性的证据，观察两束和单纤维。从显微镜图像的轮廓的统计分析显示非高斯扭结角分布。这与由交替的非晶和结晶域沿着轮廓组成的结构不一致，并支持工艺诱导的扭结形成。分别采用纳米压痕法和持久长度法对纳米纤维素的横向和纵向力学性能进行了研究。结构分析被推到单个纤维素聚合物链的水平，它们的最小缔合单元具有建议的2 × 2链堆积排列。 纤维素是在许多不同的生物系统中发现的材料，但单分子水平的精细结构仍在评估中。在这里，作者提出了在单颗粒水平上纤维素结构的高分辨率成像，发现了束和原纤维中手性的证据。
Nanocellulose fibrils are ubiquitous in nature and nanotechnologies but their mesoscopic structural assembly is not yet fully understood. Here we study the structural features of rod-like cellulose nanoparticles on a single particle level, by applying statistical polymer physics concepts on electron and atomic force microscopy images, and we assess their physical properties via quantitative nanomechanical mapping. We show evidence of right-handed chirality, observed on both bundles and on single fibrils. Statistical analysis of contours from microscopy images shows a non-Gaussian kink angle distribution. This is inconsistent with a structure consisting of alternating amorphous and crystalline domains along the contour and supports process-induced kink formation. The intrinsic mechanical properties of nanocellulose are extracted from nanoindentation and persistence length method for transversal and longitudinal directions, respectively. The structural analysis is pushed to the level of single cellulose polymer chains, and their smallest associated unit with a proposed 2 × 2 chain-packing arrangement. Cellulose is a material found in many different biological systems, but the fine structure at the single-molecule level is still being assessed. Here, the authors present high-resolution imaging of cellulose structures at the single particle level, finding evidence of chirality in bundles and fibrils.
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影响因子：
3.4
作者：
Godinho, M. H.;Canejo, J. P.;Teixeira, P. I. C.
通讯作者：
Teixeira, P. I. C.
影响因子：
16.6
作者：
Hakansson, Karl M. O.;Fall, Andreas B.;Lundell, Fredrik;Yu, Shun;Krywka, Christina;Roth, Stephan V.;Santoro, Gonzalo;Kvick, Mathias;Wittberg, Lisa Prahl;Wagberg, Lars;Soderberg, L. Daniel
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作者：
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通讯作者：
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作者：
KASS, M;WITKIN, A;TERZOPOULOS, D
通讯作者：
TERZOPOULOS, D
影响因子：
4
作者：
Adamcik, Jozef;Berquand, Alexandre;Mezzenga, Raffaele
通讯作者：
Mezzenga, Raffaele