A new class of tunable hypersonic phononic crystals based on polymer-tethered colloids.
A new class of tunable hypersonic phononic crystals based on polymer-tethered colloids.
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DOI：
10.1038/ncomms9309
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发表时间：
2015-09-22
影响因子：
16.6
通讯作者：
Fytas G
中科院分区：
文献类型：
--
作者：
Alonso-Redondo E;Schmitt M;Urbach Z;Hui CM;Sainidou R;Rembert P;Matyjaszewski K;Bockstaller MR;Fytas G
表现出定制声子带隙的混合材料的设计和工程与从声学到热光器件的领域中的创新材料技术基本相关。声子杂交间隙，起源于本地共振和传播模式之间的反交叉，已经吸引了特别的兴趣，因为它们的相对鲁棒性的结构紊乱和相关的好处“可制造性”。尽管杂化间隙材料是众所周知的，但是由于有限的性质可变性和昂贵的制造方法，它们的经济制造和差距频率的有效控制仍然是难以实现的。在这里，我们报告了一种新的策略来实现杂交间隙材料，利用“各向异性弹性”在密集的聚合物束缚的胶体颗粒的颗粒-聚合物界面。理论和布里渊散射分析证实了所产生的杂交间隙的无序性和可调性的鲁棒性，并为具有故意控制的间隙位置和宽度频率的新材料的经济合成提供指导方针。杂化型带隙在声子晶体中持续存在，但对于全固态高超声速复合材料，其制造仍然具有挑战性。在这里，作者利用弹性各向异性的界面处的聚合物栓住的胶体颗粒来控制声子传播GHz制度。
The design and engineering of hybrid materials exhibiting tailored phononic band gaps are fundamentally relevant to innovative material technologies in areas ranging from acoustics to thermo-optic devices. Phononic hybridization gaps, originating from the anti-crossing between local resonant and propagating modes, have attracted particular interest because of their relative robustness to structural disorder and the associated benefit to ‘manufacturability'. Although hybridization gap materials are well known, their economic fabrication and efficient control of the gap frequency have remained elusive because of the limited property variability and expensive fabrication methodologies. Here we report a new strategy to realize hybridization gap materials by harnessing the ‘anisotropic elasticity' across the particle–polymer interface in densely polymer-tethered colloidal particles. Theoretical and Brillouin scattering analysis confirm both the robustness to disorder and the tunability of the resulting hybridization gap and provide guidelines for the economic synthesis of new materials with deliberately controlled gap position and width frequencies. Hybridization-type band gaps are known to persist in phononic crystals, but their fabrication remains challenging for all-solid hypersonic composites. Here, the authors utilize the elastic anisotropy at the interface of polymer-tethered colloidal particles to control phonon propagation in GHz regime.