Hydrodynamic alignment and assembly of nanofibrils resulting in strong cellulose filaments.
Hydrodynamic alignment and assembly of nanofibrils resulting in strong cellulose filaments.
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DOI：
10.1038/ncomms5018
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发表时间：
2014-06-02
影响因子：
16.6
通讯作者：
Soderberg, L. Daniel
中科院分区：
文献类型：
--
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
纤维素纳米纤维可以从树木中获得，并且具有作为生物基材料的构建块的相当大的潜力。为了实现这些材料的良好性能，必须控制纳米结构。在这里，我们提出了一个过程相结合的流体动力学对齐与分散凝胶的过渡，产生均匀和光滑的长丝从低浓度的分散纤维素纳米纤维在水中。可以通过工艺参数来控制沿长丝方向的优先原纤取向沿着。比极限强度显著高于先前报道的由纤维素纳米纤丝制成的长丝。强度甚至与从木材中提取的具有相同程度的原纤维排列的最强纤维素纸浆纤维一致。在凝胶化之前成功的纳米级排列需要适当分离所涉及的时间尺度。有些令人惊讶的是，如果要实现这一点，设备必须不能太小。 从木材中分离出的纳米纤维具有作为材料构建块的潜力，但为了获得高性能，需要控制组装过程。在这里，作者报告了一种使用微流体加工纳米原纤维的方法，得到具有对齐原纤维和高强度的长丝。
Cellulose nanofibrils can be obtained from trees and have considerable potential as a building block for biobased materials. In order to achieve good properties of these materials, the nanostructure must be controlled. Here we present a process combining hydrodynamic alignment with a dispersion–gel transition that produces homogeneous and smooth filaments from a low-concentration dispersion of cellulose nanofibrils in water. The preferential fibril orientation along the filament direction can be controlled by the process parameters. The specific ultimate strength is considerably higher than previously reported filaments made of cellulose nanofibrils. The strength is even in line with the strongest cellulose pulp fibres extracted from wood with the same degree of fibril alignment. Successful nanoscale alignment before gelation demands a proper separation of the timescales involved. Somewhat surprisingly, the device must not be too small if this is to be achieved. Nanofibrils isolated from wood have potential as building blocks for materials, but in order to obtain high performance, control of the assembly process is needed. Here, the authors report a method to process nanofibrils using microfluidics, giving filaments with aligned fibrils and high strength.
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影响因子：
6.1
作者：
Krywka, Christina;Neubauer, Henrike;Mueller, Martin
通讯作者：
Mueller, Martin
影响因子：
2.5
作者：
Buffet A;Rothkirch A;Döhrmann R;Körstgens V;Abul Kashem MM;Perlich J;Herzog G;Schwartzkopf M;Gehrke R;Müller-Buschbaum P;Roth SV
通讯作者：
Roth SV
DOI：
10.1080/01418619908210415
发表时间：
1999-09-01
期刊：
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES
影响因子：
--
作者：
Reiterer, A;Lichtenegger, H;Fratzl, P
通讯作者：
Fratzl, P
影响因子：
3.9
作者：
Burgert, I;Keckes, J;Tschegg, SE
通讯作者：
Tschegg, SE
DOI：
10.1098/rspa.1922.0078
发表时间：
1922-11-01
期刊：
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-CONTAINING PAPERS OF A MATHEMATICAL AND PHYSICAL CHARACTER
影响因子：
--
作者：
Jeffery, GB
通讯作者：
Jeffery, GB