Laboratoire des Interactions Moleculaires et Reactivité Chimique et Photochimique, Université de Toulouse, CNRS UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9 (France).
Laboratoire de Physique et Chimie de Nano-Objets, Université de Toulouse, INSA, UPS, LPCNO, CNRS, 135 avenue de Rangueil, 31077 Toulouse Cedex 9 (France).
Angew Chem Int Ed Engl. 2015 Sep 7;54(37):10811-5. doi: 10.1002/anie.201504320. Epub 2015 Jul 17.
Hybrid nanocomposites based on magnetic nanoparticles dispersed in liquid crystalline elastomers are fascinating emerging materials. Their expected strong magneto-elastic coupling may open new applications as actuators, magnetic switches, and for reversible storage of magnetic information. We report here the synthesis of a novel hybrid ferromagnetic liquid crystalline elastomer. In this material, highly anisotropic Co nanorods are aligned through a cross-linking process performed in the presence of an external magnetic field. We obtain a highly anisotropic magnetic material which exhibits remarkable magneto-elastic coupling. The nanorod alignment can be switched at will at room temperature by weak mechanical stress, leading to a change of more than 50 % of the remnant magnetization ratio and of the coercive field.
基于磁性纳米粒子分散在液晶弹性体中的混合纳米复合材料是一种引人注目的新兴材料。它们预期的强磁弹性耦合可能会开辟作为执行器、磁开关以及用于磁性信息的可逆存储的新应用。我们在此报告一种新型的混合铁磁液晶弹性体的合成。在这种材料中，高度各向异性的 Co 纳米棒通过在外磁场存在下进行交联过程进行排列。我们得到一种具有显著磁弹性耦合的高各向异性磁性材料。纳米棒的排列可以通过室温下的弱机械应力随意切换，导致剩余磁化率和矫顽场的变化超过 50%。
