structured materials
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Author(s):  
Changlin Ding ◽  
Yibao Dong ◽  
Yuanbo Wang ◽  
Jianbing Shi ◽  
Shilong Zhai ◽  
...  

Abstract Acoustic metamaterials (AMMs) and acoustic metasurfaces (AMSs) are artificially structured materials with the unique properties not found in natural materials. We reviewed herein the properties of AMM and AMS that have been designed using the meta-atoms of split hollow spheres (SHSs) and hollow tubes (HTs) or meta-molecules of split hollow tubes (SHTs) with local resonance. AMMs composed of SHSs or HTs display a transmission dip with negative modulus or negative mass density. AMMs composited with SHSs and HTs present a transmission peak and a phase fluctuation in the overlapping resonant frequency region, indicating that they simultaneously have a negative modulus and a negative mass density. Furthermore, the meta-molecule AMMs with SHTs also exhibit double-negative properties. Moreover, the acoustic meta-atoms or meta-molecules can be used to fabricate acoustic topological metamaterials with topologically protected edge states propagation. These meta-atoms and meta-molecules can also attain phase discontinuity near the resonant frequency, and thus they can be used to design AMSs with the anomalous manipulation for acoustic waves. The various tunability of the meta-molecules provides a feasible path to achieve broadband AMS.


Solar Energy ◽  
2022 ◽  
Vol 231 ◽  
pp. 1037-1047
Author(s):  
Shiquan Shan ◽  
Qi Zhang ◽  
Binghong Chen ◽  
Gan He ◽  
Siqi Jia ◽  
...  

Nanoscale ◽  
2022 ◽  
Author(s):  
Zishuang Cheng ◽  
Xiaoming Zhang ◽  
Hui Zhang ◽  
Heyan Liu ◽  
Xiao Yu ◽  
...  

Since the discovery of penta-graphene, two-dimensional (2-D) pentagonal-structured materials have been highly expected for desirable performance because of their unique structures and accompanied physical properties. Hence, based on the first-principles...


Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8462
Author(s):  
Abdulaziz Alharbi ◽  
Benjamin Junker ◽  
Mohammad Alduraibi ◽  
Ahmad Algarni ◽  
Udo Weimar ◽  
...  

Beginning with LaFeO3, a prominent perovskite-structured material used in the field of gas sensing, various perovskite-structured materials were prepared using sol–gel technique. The composition was systematically modified by replacing La with Sm and Gd, or Fe with Cr, Mn, Co, and Ni. The materials synthesized are comparable in grain size and morphology. DC resistance measurements performed on gas sensors reveal Fe-based compounds solely demonstrated effective sensing performance of acetylene and ethylene. Operando diffuse reflectance infrared Fourier transform spectroscopy shows the sensing mechanism is dependent on semiconductor properties of such materials, and that surface reactivity plays a key role in the sensing response. The replacement of A-site with various lanthanoid elements conserves surface reactivity of AFeO3, while changes at the B-site of LaBO3 lead to alterations in sensor surface chemistry.


Author(s):  
Holly D. Carlton ◽  
Nickolai Volkoff-Shoemaker ◽  
Mark Messner ◽  
Nathan Barton ◽  
Mukul Kumar

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Subramanian Suriyanarayanan ◽  
Ian A. Nicholls

AbstractNano-structured materials are used in electronics, diagnostics, therapeutics, smart packaging, energy management and textiles, areas critical for society and quality of life. However, their fabrication often places high demands on limited natural resources. Accordingly, renewable sources for the feedstocks used in their production are highly desirable. We demonstrate the use of readily available biopolymers derived from maize (zein), milk (casein) and malacostraca (crab-shell derived chitin) in conjunction with sacrificial templates, self-assembled monodisperse latex beads and anodized aluminium membranes, for producing robust surfaces coated with highly regular hyperporous networks or wire-like morphological features, respectively. The utility of this facile strategy for nano-structuring of biopolymers was demonstrated in a surface based-sensing application, where biotin-selective binding sites were generated in the zein-based nano-structured hyperporous network.


2021 ◽  
pp. 63-80
Author(s):  
Wahid Ali ◽  
Mohammad Ehtisham Khan ◽  
Akbar Mohammad ◽  
Waleed Alhazmi

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