High Frequency Sonoprocessing: A New Field of Cavitation-Free Acoustic Materials Synthesis, Processing, and Manipulation.
High Frequency Sonoprocessing: A New Field of Cavitation-Free Acoustic Materials Synthesis, Processing, and Manipulation.
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DOI：
10.1002/advs.202001983
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发表时间：
2020-01
期刊：
影响因子：
--
通讯作者：
Yeo LY
中科院分区：
文献类型：
--
作者：
Rezk AR;Ahmed H;Ramesan S;Yeo LY
超声波是材料加工的有力手段。同样，一个新的领域已经出现，证明了利用频率(10兆赫到1兆赫)比传统超声波(⩽3兆赫)高得多的声能源来合成和操纵各种块状、纳米级和生物材料的可能性。在这些频率和使用的典型声强下，空化--大多数声化学过程的基础，或者更广泛地说，超声波介导的过程--基本上没有，这表明完全不同的机制在发挥作用。例如，新形态或高度定向结构的结晶；二维量子点和纳米片的剥离；聚合物纳米颗粒的合成和封装；以及操纵二维半导体材料的带隙或构成细胞膜的脂质结构的可能性，后者导致增强细胞内分子摄取的能力。这些引人入胜的例子揭示了与这种高频表面振动相关的高度非线性机电耦合如何引起各种静态和动态电荷产生和转移效应，以及分子的有序化、极化和组装--值得注意的是，考虑到声波波长和特征分子长度尺度之间的巨大空间分离，或者在MHz级激发频率和典型THz级分子振动频率之间的巨大分离。最近的工作表明，与传统的低频声化学过程不同，MHz频率的高频声振动为操纵块体/2D晶体和生物材料提供了巨大的机会，从而开辟了无空化材料合成和加工的新领域。
Ultrasound constitutes a powerful means for materials processing. Similarly, a new field has emerged demonstrating the possibility for harnessing sound energy sources at considerably higher frequencies (10 MHz to 1 GHz) compared to conventional ultrasound (⩽3 MHz) for synthesizing and manipulating a variety of bulk, nanoscale, and biological materials. At these frequencies and the typical acoustic intensities employed, cavitation—which underpins most sonochemical or, more broadly, ultrasound‐mediated processes—is largely absent, suggesting that altogether fundamentally different mechanisms are at play. Examples include the crystallization of novel morphologies or highly oriented structures; exfoliation of 2D quantum dots and nanosheets; polymer nanoparticle synthesis and encapsulation; and the possibility for manipulating the bandgap of 2D semiconducting materials or the lipid structure that makes up the cell membrane, the latter resulting in the ability to enhance intracellular molecular uptake. These fascinating examples reveal how the highly nonlinear electromechanical coupling associated with such high‐frequency surface vibration gives rise to a variety of static and dynamic charge generation and transfer effects, in addition to molecular ordering, polarization, and assembly—remarkably, given the vast dimensional separation between the acoustic wavelength and characteristic molecular length scales, or between the MHz‐order excitation frequencies and typical THz‐order molecular vibration frequencies. Recent work has shown that high‐frequency acoustic vibration at MHz‐order frequencies offers vast opportunities for manipulating bulk/2D crystals and biological materials distinct from conventional sonochemical processes at lower frequencies, therefore opening up a new field of cavitation‐free materials synthesis and processing.
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