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Lee SS, Micklow L, Tunell A, Chien KC, Mohanty S, Cates N, Furst S, Chang CH. Engineering Large-Area Antidust Surfaces by Harnessing Interparticle Forces. ACS APPLIED MATERIALS & INTERFACES 2023; 15:13678-13688. [PMID: 36811627 DOI: 10.1021/acsami.2c19211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Dust accumulation is detrimental to optical elements, electronic devices, and mechanical systems and is a significant problem in space missions and renewable energy deployment. In this paper, we report the demonstration of antidust nanostructured surfaces that can remove close to 98% of lunar particles solely via gravity. The dust mitigation is driven by a novel mechanism, whereby particle removal is facilitated by the formation of particle aggregates due to interparticle forces, allowing the particles to be removed in the presence of other particles. The structures are fabricated using a highly scalable nanocoining and nanoimprint process, where nanostructures with precise geometry and surface properties are patterned on polycarbonate substrates. The dust mitigation properties of the nanostructures have been characterized using optical metrology, electron microscopy, and image processing algorithms to demonstrate that the surfaces can be engineered to remove nearly all of the particles above 2 μm in size in the presence of Earth's gravity. Compared to the 35.0% area coverage on a smooth polycarbonate surface, the particle coverage on nanostructures with 500 nm period is significantly reduced to 2.4%, an improvement of 93%. This work enhances the understanding of the particulate adhesion on textured surfaces and demonstrates a scalable, effective solution to antidust surfaces that can be broadly applied to windows, solar panels, and electronics.
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Affiliation(s)
- Samuel S Lee
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Lauren Micklow
- Smart Material Solutions, Inc., Raleigh, North Carolina 27607, United States
| | - Andrew Tunell
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Kun-Chieh Chien
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Saurav Mohanty
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Nichole Cates
- Smart Material Solutions, Inc., Raleigh, North Carolina 27607, United States
| | - Stephen Furst
- Smart Material Solutions, Inc., Raleigh, North Carolina 27607, United States
| | - Chih-Hao Chang
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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Atomic Layer Assembly Based on Sacrificial Templates for 3D Nanofabrication. MICROMACHINES 2022; 13:mi13060856. [PMID: 35744470 PMCID: PMC9229614 DOI: 10.3390/mi13060856] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 05/25/2022] [Accepted: 05/26/2022] [Indexed: 02/04/2023]
Abstract
Three-dimensional (3D) nanostructures have attracted widespread attention in physics, chemistry, engineering sciences, and biology devices due to excellent functionalities which planar nanostructures cannot achieve. However, the fabrication of 3D nanostructures is still challenging at present. Reliable fabrication, improved controllability, and multifunction integration are desired for further applications in commercial devices. In this review, a powerful fabrication method to realize 3D nanostructures is introduced and reviewed thoroughly, which is based on atomic layer deposition assisted 3D assembly through various sacrificial templates. The aim of this review is to provide a comprehensive overview of 3D nanofabrication based on atomic layer assembly (ALA) in multifarious sacrificial templates for 3D nanostructures and to present recent advancements, with the ultimate aim to further unlock more potential of this method for nanodevice applications.
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Wang W, Lai H, Cheng Z, Fan Z, Zhang D, Wang J, Yu S, Xie Z, Liu Y. Superhydrophobic Shape Memory Polymer Microarrays with Switchable Directional/Antidirectional Droplet Sliding and Optical Performance. ACS APPLIED MATERIALS & INTERFACES 2020; 12:49219-49226. [PMID: 33050697 DOI: 10.1021/acsami.0c13627] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Bioinspired smart surfaces with switchable wettability and optical performance have aroused much attention in the past few years. However, almost all reported surfaces focused on regulating single surface function. In this work, inspired by the butterfly wings, a novel superhydrophobic surface with shape memory polymer microarrays (SMPAs) was prepared through the integration of three-dimensional printing, replica-molding, and a simple surface treatment. In this superhydrophobic SMPA system, the permanent upright microarrays and temporary tilted microarrays can be reversibly switched owing to the excellent shape memory effect (SME). Accompanied by the structure variations, switchable directional/antidirectional droplet sliding and vivid color conversion as the butterfly wings can be achieved. Moreover, because of the SME, local structure regulation can also be achieved on the surface, and with the help of such an ability, the SMPA was further applied as a multifunctional platform to demonstrate controllable droplet transportation and information storage. This work reports the reversible control of directional/antidirectional droplet sliding and tunable color on a superhydrophobic SMPA, and it is believed that such a smart surface can be potentially applied in many fields, such as microfluidic devices and smart optical chips.
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Affiliation(s)
- Wu Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Hua Lai
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Zhongjun Cheng
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Zhimin Fan
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Dongjie Zhang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Jingfeng Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Songji Yu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Zhimin Xie
- The National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, China
| | - Yuyan Liu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
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Sackey J, Nuru ZY, Mlungisin N, Maaza M. Investigation of the morphological cell structures and their optical significances of Aeshna cyanea. IET Nanobiotechnol 2020; 13:857-859. [PMID: 31625527 DOI: 10.1049/iet-nbt.2019.0036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The transparent wing of the dragonfly Aeshna cyanea has been investigated using scanning electron microscopy (SEM), optical microscopy (OPM), energy-dispersive X-ray spectroscopy (EDS) and reflectance spectroscopy. Four cells (D1-D4) were studied and classified according to their general morphology. The OPM depicted the vein-joint characterised by the distribution of resilin. EDS technique showed common elements such as carbon, oxygen, and chlorine. SEM analysis revealed thin membranes reinforced with a network of hallow veins. Spikes and round shape of microstructures were identified. The roughness of the pruinosity was estimated, which indicates the shape and curvature of the microstructures that essentially play a significant role in the optical response observed. The study can be essential to design and improve micro-air vehicles.
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Affiliation(s)
- Juliet Sackey
- University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa.
| | - Zebib Yenus Nuru
- Department of Physics, Adigrat University, P.O. Box 50, Adgrat, Ethiopia
| | - Nkosi Mlungisin
- University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa
| | - Malik Maaza
- University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa
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Effect of grafted chains on the heat transfer between carbon nanotubes in a polyamide-6.6 matrix: A molecular dynamics study. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.09.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sackey J, Nuru ZY, Sone BT, Maaza M. Structural and optical investigation on the wings of Idea malabarica (Moore, 1877). IET Nanobiotechnol 2017; 11:71-76. [PMID: 28476965 DOI: 10.1049/iet-nbt.2016.0049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The nanostructures on the wings of Idea malabarica (Moore, 1877) were analysed using scanning electron microscopy, energy dispersive X-ray spectroscopy, atomic force microscopy, Fourier transform-infrared spectroscopy, and reflectance measurements. The chemical and morphological analyses revealed the chitin-based intricate nanostructures. The influence of the nanostructures on the wetting characteristics of the wing was investigated using optical imaging. Applying the Maxwell-Garnet approximation to the porosities within the nanostructures, the refractive indices, which relate the reflectance response, were estimated. It was concluded that the colour seen on the wings of the Idea malabarica originate from the nanostructural configurations of the chitin-based structures and the embedded pigment.
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Affiliation(s)
- Juliet Sackey
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk ridge, P.O. Box 392, Pretoria, South Africa.
| | - Zebib Y Nuru
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk ridge, P.O. Box 392, Pretoria, South Africa
| | - Bertrand Tumbain Sone
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk ridge, P.O. Box 392, Pretoria, South Africa
| | - Malik Maaza
- UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk ridge, P.O. Box 392, Pretoria, South Africa
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Kadoya N, Arai N. Size dependence of static polymer droplet behavior from many-body dissipative particle dynamics simulation. Phys Rev E 2017; 95:043109. [PMID: 28505819 DOI: 10.1103/physreve.95.043109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Indexed: 11/07/2022]
Abstract
We used molecular simulation to study the static behavior of polymer droplets in vacuum and on solid surfaces, namely the size of the droplet and the contact angle, respectively. The effects of the polymer chain length and the total number of particles were calculated by the many-body dissipative particle dynamics method. For the spherical droplet containing the same number of particles, we show that its radius depends on the polymer chain length. The radius of the droplet is also proportional to one-third power of the total number of particles for all given chain lengths. For the hemispherical droplet, the contact angle increases with the number of particles in the droplet, and this effect is relatively strong, especially for longer polymer chains. The effect of wettability of the solid surface was also investigated by using polymerphobic (low-affinity) and polymerphilic (high-affinity) surfaces. As the chain length increases, the contact angle on the low-affinity surface decreases, while that on the hydrophilic surface increases. The simulation reveals that there is a critical affinity for the monomer on the solid surface; above and below which the wettability increases and decreases as the molecular length increases, respectively.
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Affiliation(s)
- Naoki Kadoya
- Kindai University, 3-4-1 Kowakae, Higashiosaka, Osaka, 577-8502 Japan
| | - Noriyoshi Arai
- Kindai University, 3-4-1 Kowakae, Higashiosaka, Osaka, 577-8502 Japan
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Recent progress of atomic layer deposition on polymeric materials. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 70:1182-1191. [DOI: 10.1016/j.msec.2016.01.093] [Citation(s) in RCA: 144] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 01/25/2016] [Accepted: 01/30/2016] [Indexed: 11/17/2022]
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9
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Li Z, Xu Z, Liu Y, Wang R, Gao C. Multifunctional non-woven fabrics of interfused graphene fibres. Nat Commun 2016; 7:13684. [PMID: 27901022 PMCID: PMC5141476 DOI: 10.1038/ncomms13684] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 10/23/2016] [Indexed: 12/23/2022] Open
Abstract
Carbon-based fibres hold promise for preparing multifunctional fabrics with electrical conductivity, thermal conductivity, permeability, flexibility and lightweight. However, these fabrics are of limited performance mainly because of the weak interaction between fibres. Here we report non-woven graphene fibre fabrics composed of randomly oriented and interfused graphene fibres with strong interfibre bonding. The all-graphene fabrics obtained through a wet-fusing assembly approach are porous and lightweight, showing high in-plane electrical conductivity up to ∼2.8 × 104 S m−1 and prominent thermal conductivity of ∼301.5 W m−1 K−1. Given the low density (0.22 g cm−3), their specific electrical and thermal conductivities set new records for carbon-based papers/fabrics and even surpass those of individual graphene fibres. The as-prepared fabrics are further used as ultrafast responding electrothermal heaters and durable oil-adsorbing felts, demonstrating their great potential as high-performance and multifunctional fabrics in real-world applications. Carbon-based fibres are at the core of electrically conductive multifunctional fabrics, yet improving the weak interaction between fibres remains a challenge. Here, the authors demonstrate an assembly method where graphene fibres are fused at junctions with record specific electrical and thermal conductivity.
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Affiliation(s)
- Zheng Li
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials &Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Zhen Xu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials &Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Yingjun Liu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials &Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Ran Wang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials &Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Chao Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Key Laboratory of Adsorption and Separation Materials &Technologies of Zhejiang Province, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
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10
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Wang Y, Pham DT, Zhang Z, Li J, Ji C, Liu Y, Leng J. Sustainable self-healing at ultra-low temperatures in structural composites incorporating hollow vessels and heating elements. ROYAL SOCIETY OPEN SCIENCE 2016; 3:160488. [PMID: 27703711 PMCID: PMC5043331 DOI: 10.1098/rsos.160488] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 08/17/2016] [Indexed: 05/30/2023]
Abstract
Self-healing composites are able to restore their properties automatically. Impressive healing efficiencies can be achieved when conditions are favourable. On the other hand, healing might not be possible under adverse circumstances such as very low ambient temperature. Here, we report a structural composite able to maintain its temperature to provide a sustainable self-healing capability-similar to that in the natural world where some animals keep a constant body temperature to allow enzymes to stay active. The composite embeds three-dimensional hollow vessels with the purpose of delivering and releasing healing agents, and a porous conductive element to provide heat internally to defrost and promote healing reactions. A healing efficiency over 100% at around -60°C was obtained. The effects of the sheets on the interlaminar and tensile properties have been investigated experimentally. The proposed technique can be implemented in a majority of extrinsic self-healing composites to enable automatic recovery at ultra-low temperatures.
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Affiliation(s)
- Yongjing Wang
- Department of Mechanical Engineering, School of Engineering, University of Birmingham, Edgbaston, Birmingham, UK
| | - Duc Truong Pham
- Department of Mechanical Engineering, School of Engineering, University of Birmingham, Edgbaston, Birmingham, UK
| | - Zhichun Zhang
- Center for Composite Materials and Structures, Harbin Institute of Technology, Science Park, Harbin, People's Republic of China
| | - Jinjun Li
- Applied Science Faculty, Delft University of Technology, Delft, The Netherlands
| | - Chunqian Ji
- Department of Mechanical Engineering, School of Engineering, University of Birmingham, Edgbaston, Birmingham, UK
| | - Yanju Liu
- Department of Aerospace Science and Mechanics, Harbin Institute of Technology, Science Park, Harbin, People's Republic of China
| | - Jinsong Leng
- Center for Composite Materials and Structures, Harbin Institute of Technology, Science Park, Harbin, People's Republic of China
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11
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Tune DD, Stolz BW, Pfohl M, Flavel BS. Dry shear aligning: a simple and versatile method to smooth and align the surfaces of carbon nanotube thin films. NANOSCALE 2016; 8:3232-3236. [PMID: 26792245 DOI: 10.1039/c5nr08784h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We show that the application of lateral shear force on a randomly oriented thin film of carbon nanotubes, in the dry state, causes significant reordering of the nanotubes at the film surface. This new technique of dry shear aligning is applicable to carbon nanotube thin films produced by many of the established methods.
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Affiliation(s)
- D D Tune
- Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
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12
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Xin G, Yao T, Sun H, Scott SM, Shao D, Wang G, Lian J. Highly thermally conductive and mechanically strong graphene fibers. Science 2015; 349:1083-7. [DOI: 10.1126/science.aaa6502] [Citation(s) in RCA: 471] [Impact Index Per Article: 52.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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13
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Chou SY, Yu CC, Yen YT, Lin KT, Chen HL, Su WF. Romantic Story or Raman Scattering? Rose Petals as Ecofriendly, Low-Cost Substrates for Ultrasensitive Surface-Enhanced Raman Scattering. Anal Chem 2015; 87:6017-24. [DOI: 10.1021/acs.analchem.5b00551] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Sin-Yi Chou
- Department of Materials Science
and Engineering, National Taiwan University, Number 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.)
| | - Chen-Chieh Yu
- Department of Materials Science
and Engineering, National Taiwan University, Number 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.)
| | - Yu-Ting Yen
- Department of Materials Science
and Engineering, National Taiwan University, Number 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.)
| | - Keng-Te Lin
- Department of Materials Science
and Engineering, National Taiwan University, Number 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.)
| | - Hsuen-Li Chen
- Department of Materials Science
and Engineering, National Taiwan University, Number 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.)
| | - Wei-Fang Su
- Department of Materials Science
and Engineering, National Taiwan University, Number 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan (R.O.C.)
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Gu J, Zhang W, Su H, Fan T, Zhu S, Liu Q, Zhang D. Morphology genetic materials templated from natural species. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:464-478. [PMID: 25331783 DOI: 10.1002/adma.201401413] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 05/07/2014] [Indexed: 06/04/2023]
Abstract
The structural characteristics of natural species have been optimized by natural selection for millions of years. They offer specific functions much more effectively than artificial approaches. Morphology genetic materials utilize morphologies gleaned from natural selection into their hierarchical structures. The combination of natural morphologies and manually selected functional materials makes these novel materials suitable for many applications. This review focuses on the strategies by which the structures and functions of natural species can be utilized. Specific functions inherited from both the natural microstructures and coupled functional materials are highlighted with regard to various applications, including photonics, light-harvesting, surface-enhanced Raman scattering (SERS), and electrodes for supercapacitors and batteries, as well as environmentally friendly materials.
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Affiliation(s)
- Jiajun Gu
- State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, PR China
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Piszter G, Kertész K, Vértesy Z, Bálint Z, Biró LP. Substance specific chemical sensing with pristine and modified photonic nanoarchitectures occurring in blue butterfly wing scales. OPTICS EXPRESS 2014; 22:22649-22660. [PMID: 25321733 DOI: 10.1364/oe.22.022649] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Butterfly wing scales containing photonic nanoarchitectures act as chemically selective sensors due to their color change when mixing vapors in the atmosphere. Based on butterfly vision, we built a model for efficient characterization of the spectral changes in different atmospheres. The spectral shift is vapor specific and proportional with the vapor concentration. Results were compared to standard principal component analysis. The modification of the chemical properties of the scale surface by the deposition of 5 nm of Al(2)O(3) significantly alters the character of the optical response. This is proof of the possibility to purposefully tune the selectivity of such sensors.
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Webb HK, Crawford RJ, Ivanova EP. Wettability of natural superhydrophobic surfaces. Adv Colloid Interface Sci 2014; 210:58-64. [PMID: 24556235 DOI: 10.1016/j.cis.2014.01.020] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 01/27/2014] [Accepted: 01/28/2014] [Indexed: 10/25/2022]
Abstract
Since the description of the 'Lotus Effect' by Barthlott and Neinhuis in 1997, the existence of superhydrophobic surfaces in the natural world has become common knowledge. Superhydrophobicity is associated with a number of possible evolutionary benefits that may be bestowed upon an organism, ranging from the ease of dewetting of their surfaces and therefore prevention of encumbrance by water droplets, self-cleaning and removal of particulates and potential pathogens, and even to antimicrobial activity. The superhydrophobic properties of natural surfaces have been attributed to the presence of hierarchical microscale (>1 μm) and nanoscale (typically below 200 nm) structures on the surface, and as a result, the generation of topographical hierarchy is usually considered of high importance in the fabrication of synthetic superhydrophobic surfaces. When one surveys the breadth of data available on naturally existing superhydrophobic surfaces, however, it can be observed that topographical hierarchy is not present on all naturally superhydrophobic surfaces; in fact, the only universal feature of these surfaces is the presence of a sophisticated nanoscale structure. Additionally, several natural surfaces, e.g. those present on rose petals and gecko feet, display high water contact angles and high adhesion of droplets, due to the pinning effect. These surfaces are not truly superhydrophobic, and lack significant degrees of nanoscale roughness. Here, we discuss the phenomena of superhydrophobicity and pseudo-superhydrophobicity in nature, and present an argument that while hierarchical surface roughness may aid in the stability of the superhydrophobic effect, it is nanoscale surface architecture alone that is the true determinant of superhydrophobicity.
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Bourourou M, Elouarzaki K, Holzinger M, Agnès C, Le Goff A, Reverdy-Bruas N, Chaussy D, Party M, Maaref A, Cosnier S. Freestanding redox buckypaper electrodes from multi-wall carbon nanotubes for bioelectrocatalytic oxygen reduction via mediated electron transfer. Chem Sci 2014. [DOI: 10.1039/c3sc53544d] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The design of redox buckypapersviacross-linking of carbon nanotubes with bis-pyrene modified ABTS.
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Affiliation(s)
- Mariem Bourourou
- Département de Chimie Moléculaire (DCM)
- UMR-5250
- CNRS-UJF
- 38041 Grenoble, France
- Laboratoire de Physique et Chimie des Interfaces
| | - Kamal Elouarzaki
- Département de Chimie Moléculaire (DCM)
- UMR-5250
- CNRS-UJF
- 38041 Grenoble, France
| | - Michael Holzinger
- Département de Chimie Moléculaire (DCM)
- UMR-5250
- CNRS-UJF
- 38041 Grenoble, France
| | - Charles Agnès
- Département de Chimie Moléculaire (DCM)
- UMR-5250
- CNRS-UJF
- 38041 Grenoble, France
| | - Alan Le Goff
- Département de Chimie Moléculaire (DCM)
- UMR-5250
- CNRS-UJF
- 38041 Grenoble, France
| | - Nadège Reverdy-Bruas
- LGP2 (Laboratory of Pulp and Paper Science and Graphic Arts)
- Grenoble INP-Pagora
- CNRS UMR 5518
- 38402 Saint-Martin-D'hères Cedex, France
| | - Didier Chaussy
- LGP2 (Laboratory of Pulp and Paper Science and Graphic Arts)
- Grenoble INP-Pagora
- CNRS UMR 5518
- 38402 Saint-Martin-D'hères Cedex, France
| | - Mikael Party
- LGP2 (Laboratory of Pulp and Paper Science and Graphic Arts)
- Grenoble INP-Pagora
- CNRS UMR 5518
- 38402 Saint-Martin-D'hères Cedex, France
| | - Abderrazak Maaref
- Laboratoire de Physique et Chimie des Interfaces
- Faculté des sciences de Monastir
- Monastir, Tunisia
| | - Serge Cosnier
- Département de Chimie Moléculaire (DCM)
- UMR-5250
- CNRS-UJF
- 38041 Grenoble, France
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Zhang W, Gu J, Liu Q, Su H, Fan T, Zhang D. Butterfly effects: novel functional materials inspired from the wings scales. Phys Chem Chem Phys 2014; 16:19767-80. [DOI: 10.1039/c4cp01513d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review will provide a perspective overview of the research inspired from butterfly wing structures in recent years.
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Affiliation(s)
- Wang Zhang
- State Key Lab of Metal matrix Composites
- Shanghai Jiaotong University
- Shanghai 200240, P. R. China
| | - Jiajun Gu
- State Key Lab of Metal matrix Composites
- Shanghai Jiaotong University
- Shanghai 200240, P. R. China
| | - Qinglei Liu
- State Key Lab of Metal matrix Composites
- Shanghai Jiaotong University
- Shanghai 200240, P. R. China
| | - Huilan Su
- State Key Lab of Metal matrix Composites
- Shanghai Jiaotong University
- Shanghai 200240, P. R. China
| | - Tongxiang Fan
- State Key Lab of Metal matrix Composites
- Shanghai Jiaotong University
- Shanghai 200240, P. R. China
| | - Di Zhang
- State Key Lab of Metal matrix Composites
- Shanghai Jiaotong University
- Shanghai 200240, P. R. China
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Khan S, Singh JK. Wetting transition of nanodroplets of water on textured surfaces: a molecular dynamics study. MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2013.819578] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Szilágyi IM, Teucher G, Härkönen E, Färm E, Hatanpää T, Nikitin T, Khriachtchev L, Räsänen M, Ritala M, Leskelä M. Programming nanostructured soft biological surfaces by atomic layer deposition. NANOTECHNOLOGY 2013; 24:245701. [PMID: 23680967 DOI: 10.1088/0957-4484/24/24/245701] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Here, we present the first successful attempt to programme the surface properties of nanostructured soft biological tissues by atomic layer deposition (ALD). The nanopatterned surface of lotus leaf was tuned by 3-125 nm TiO2 thin films. The lotus/TiO2 composites were studied by SEM-EDX, XPS, Raman, TG-DTA, XRR, water contact angle and photocatalysis measurements. While we could preserve the superhydrophobic feature of lotus, we managed to add a new property, i.e. photocatalytic activity. We also explored how surface passivation treatments and various ALD precursors affect the stability of the sensitive soft biological tissues. As we were able to gradually change the number of nanopatterns of lotus, we gained new insight into how the hollow organic nanotubes on the surface of lotus influence its superhydrophobic feature.
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Zhang BJ, Park J, Kim KJ, Yoon H. Biologically inspired tunable hydrophilic/hydrophobic surfaces: a copper oxide self-assembly multitier approach. BIOINSPIRATION & BIOMIMETICS 2012; 7:036011. [PMID: 22556129 DOI: 10.1088/1748-3182/7/3/036011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this study, a fabrication method for biologically inspired superhydrophobic micro- and nano-structured tier surfaces, each made of a self-assembled copper oxide, is presented. The method is controllable and applicable to bulk production when compared to existing high-end fabrication techniques. By modulating wet chemistry, different shapes and scales of tier structures were created. We demonstrated that their wetting behaviors are closely related to morphological information such as pitch, height and shape. To characterize their wetting behaviors, several experiments were designed and executed. In static water contact angle (WCA) measurements, morphological modulation led to wide WCA range (17°-95°). After hydrophobic self-assembly monolayer of 1-dodecanethiol, their WCA was escalated into superhydrophobic regime. In dynamic WCA, the contact angle hysteresis is greatly reduced by hybridizing the micro- and nano-tier (multiple tiers) when compared to utilizing a single tier. Also, the modification of the surface structure influences the rate of evaporation. In an analytical approach, the multiple tiers show a lower surface free energy compared to that of the single tier. By hybridizing different scales and shapes of tiers-such as hemispheric and conic shapes-the multiple tiers can efficiently reduce the surface energy barrier. Eventually, these manipulations lead to a subtle WCA hysteresis during the liquid motion testing. The analytical results are consistent with the dynamic WCA measurements. The multiple tiers also stabilize the Cassie regime and result in an increased hydrophobicity, which is more than when a single tier is employed.
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Affiliation(s)
- Bong June Zhang
- Low Carbon Green Technology Laboratory, Department of Mechanical Engineering, University of Nevada, 1664 N Virginia Street, Reno, NV 89557, USA
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Gong B, Parsons GN. Quantitative in situ infrared analysis of reactions between trimethylaluminum and polymers during Al2O3 atomic layer deposition. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32343e] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lin YR, Lai KY, Wang HP, He JH. Slope-tunable Si nanorod arrays with enhanced antireflection and self-cleaning properties. NANOSCALE 2010; 2:2765-2768. [PMID: 20936223 DOI: 10.1039/c0nr00402b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Slope-tunable Si nanorod arrays (NRAs) were fabricated with colloidal lithography and reactive ion etching (RIE). Sharpened NRAs fabricated by increasing the SF6/O2 flow ratio during RIE exhibit enhanced antireflection (AR) and hydrophobic properties, which are attributed to the smooth gradient in the effective refractive index of NRAs, and the enlarged water/air interface of the water drops in the NRA layers, respectively. Enhanced AR characteristics via modifying the slope of NRAs are accompanied by broad-band working ranges, omnidirectionality, and polarization insensitivity. Detailed experimental and theoretical analysis of slope-tunable NRAs should benefit the development of various self-cleaning optoelectronic devices with efficient light management.
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Affiliation(s)
- Yi-Ruei Lin
- Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan, ROC
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Dai YA, Chang HC, Lai KY, Lin CA, Chung RJ, Lin GR, He JH. Subwavelength Si nanowire arrays for self-cleaning antireflection coatings. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm00524j] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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