51
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Zheng Z, Zhao Y, Hu J, Wang H. Flexible, Strong, Multifunctional Graphene Oxide/Silica-Based Composite Aerogels via a Double-Cross-Linked Network Approach. ACS APPLIED MATERIALS & INTERFACES 2020; 12:47854-47864. [PMID: 33045826 DOI: 10.1021/acsami.0c14333] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Multifunctional silica-based aerogels are an emerging material due to their unique properties and wide applications. However, their large-scale production and application are limited due to the high cost and cumbersome preparation process. Herein, we prepare graphene oxide (GO)/silica-based composite aerogels via a simple in situ sol-gel reaction. GO nanosheets (GOs) are functionalized with polyethylenimine (PEI) and 3-glycidyloxypropyltrimethoxysilane (GPTMS) successively. After a cohydrolysis and condensation of trimethoxymethylsilane (MTMS) and dimethoxydimethylsilane (DMDMS) in the presence of GOs and a convenient ambient-pressure drying process, the composite aerogels are obtained. In addition to the normal cross-linking of MTMS and DMDMS, the GOs also behave as cross-linking points to significantly enhance the mechanical properties and thermal stability of the network of the composite aerogels. The pore structure of the aerogels is tailored by varying the GO loads as well as its surface modification. The Young's modulus of a composite aerogel with a GO load of 0.5 wt % is about 5 times that for a neat polysiloxane aerogel, and the maximum degradation rate temperature is increased to over 90 °C. Compared with pure polysiloxane aerogel, the thermal insulation and flame resistance are also improved by a small addition of GOs. Moreover, GO/silica-based composite aerogels show stable piezo-resistive behavior. With the excellent mechanical properties, thermal stability, and multifunctionality, GO/silica-based composite aerogels show promising applications under some harsh and extreme conditions.
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Affiliation(s)
- Zheng Zheng
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China
| | - Yongliang Zhao
- Shanghai Dilato Materials Co., Ltd, Shanghai 200433, China
| | - Jianhua Hu
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China
| | - Haitao Wang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China
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52
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Liu Z, Ran Y, Xi J, Wang J. Polymeric hybrid aerogels and their biomedical applications. SOFT MATTER 2020; 16:9160-9175. [PMID: 32851389 DOI: 10.1039/d0sm01261k] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Aerogels are a class of porous materials that possess extremely high specific surface area, high pore volume, high porosity, and variable chemical structures. They have been widely applied in the fields of aerospace, chemical engineering, construction, electrotechnics, and biomedicine. In recent years a great boom in aerogels has been observed, where various new aerogels with novel physicochemical properties and functions have been synthesized. Nevertheless, native aerogels with a single component normally face severe problems such as low mechanical strength and lack of functions. One strategy to solve the problems is to construct hybrid aerogels. In this study, a comprehensive review on polymer based hybrid aerogels is presented, including polymer-polymer, polymer-carbon material, and polymer-inorganic hybrid aerogels, which will be introduced and discussed in view of their chemical structures and hybrid structures. Most importantly, polymeric hybrid aerogels are classified into three different composition levels, which are molecular-level, molecular-aggregate-level, and aggregate-level, due to the fact that hybrid aerogels with the same chemical structures but with different composition levels might show quite different functions or properties. The biomedical applications of these hybrid aerogels will also be reviewed and discussed, where the polymeric components in the hybrid aerogels provide the main contribution. This review would provide creative design principles for aerogels by considering both their chemical and physical structures.
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Affiliation(s)
- Zongjian Liu
- Department of Rehabilitation, Beijing Rehabilitation Hospital, Capital Medical University, Beijing 100144, P. R. China.
| | - Yuanyuan Ran
- Department of Rehabilitation, Beijing Rehabilitation Hospital, Capital Medical University, Beijing 100144, P. R. China.
| | - Jianing Xi
- Department of Rehabilitation, Beijing Rehabilitation Hospital, Capital Medical University, Beijing 100144, P. R. China.
| | - Jin Wang
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, P. R. China. and Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Chinese Academy of Sciences, Suzhou 215123, P. R. China
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53
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Du Y, Zhang X, Wang J, Liu Z, Zhang K, Ji X, You Y, Zhang X. Reaction-Spun Transparent Silica Aerogel Fibers. ACS NANO 2020; 14:11919-11928. [PMID: 32902257 DOI: 10.1021/acsnano.0c05016] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Aerogel fibers, the simultaneous embodiment of aerogel 3D network and fibrous geometry, have shown great advantages over natural and synthetic fibers in thermal insulation. However, as a fast gelation to ensure aerogel fiber spinning generally induces rapid local clustering of precursor particles (i.e., phase separation) and unavoidably results in nontransparency and nonuniformity in the gel state, a severe challenge remains in remedying the spinning to make transparent aerogel fibers come true. Herein, we report a reaction spinning toward highly porous silica aerogel fibers, where the Brownian motion (i.e., diffusion) of colloidal particles is hampered during spinning to allow the maintaining of the fiber shape, while a rapid gelation reaction is activated by concentrated ammonia to solidify the fiber. The aggregation degree of the primary particles can be precisely controlled by pH-dependent hydrolyzation, and thus, the final aerogel fiber can be either transparent or opaque, as dominated by Rayleigh or Mie scattering. The resulting transparent silica aerogel fibers with low density, high specific surface area, and flexibility can inherit advanced features including excellent thermal insulation, wide temperature stability, and optional hydrophobic functionalization and, thus, be suitable for wearable applications.
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Affiliation(s)
- Yu Du
- School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Xiaohua Zhang
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
- Innovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China
| | - Jin Wang
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Zengwei Liu
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Kun Zhang
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Xiaofei Ji
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
| | - Yezi You
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Xuetong Zhang
- Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
- Division of Surgery & Interventional Science, University College London, London NW3 2PF, United Kingdom
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54
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Wang G, Zhao T, Chen L, Liu K, Fang R, Liu M. Fabrication of Elastic Macroporous Polymers with Enhanced Oil Absorbability and Antiwaxing Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:10794-10802. [PMID: 32794401 DOI: 10.1021/acs.langmuir.0c01655] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Porous polymers are of great interest in potential energy storage and environmental remediation applications. However, traditional fabrication methods are either time-consuming or energy-consuming and deteriorate the mechanical strength of polymer materials. In this study, polymerization-induced phase separation was used to realize the template-free fabrication of superflexible macroporous polymers. Since the solvent is also used as a porogen, this method can be widely used to synthesize several porous polymers by carefully choosing the solvent and monomer. Compared to nonstructured polymers, the prepared macroporous polymers exhibited enhanced mechanical strength, superflexibility, multicompressibility, and bending properties. Along with hydrophobicity/oleophilicity and macroporous structures, the as-prepared porous polymers demonstrated controllable oil absorbability and release; furthermore, after infusing with lubrication liquid, these materials can be used as antiwaxing materials. The elastic porous polymers prepared using this simple and universal method show great potential for various applications, including controlled drug release, antiwaxing, and lubrication.
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Affiliation(s)
- Guangyan Wang
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Tianyi Zhao
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Lie Chen
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Kesong Liu
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P. R. China
- Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, P. R. China
| | - Ruochen Fang
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P. R. China
| | - Mingjie Liu
- Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, P. R. China
- Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, P. R. China
- International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
- Research Institute of Frontier Science, Beihang University, Beijing 100191, P. R. China
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55
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Wang L, Zhang M, Yang B, Tan J, Ding X. Highly Compressible, Thermally Stable, Light-Weight, and Robust Aramid Nanofibers/Ti 3AlC 2 MXene Composite Aerogel for Sensitive Pressure Sensor. ACS NANO 2020; 14:10633-10647. [PMID: 32790287 DOI: 10.1021/acsnano.0c04888] [Citation(s) in RCA: 108] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Various wearable aerogel sensors are emerging for their light weight, fairly wide sensing range, and sensitive sensing ability. Aramid nanofibers (ANFs) as a kind of burgeoning building blocks realize multifunctional applications in diversified fields for their innate extinguished mechanical property and thermal stability. Limited by their high insulating property, in this work ANFs were designed to integrate with a 2D emerging MXene sheet with a distinct conductive property. Herein, we report an MXene/ANFs composite aerogel through a feasible controllable vacuum filtration followed by a freeze-drying process. Benefiting from the inerratic 3D hierarchical and "mortar-brick" porous structure with an ultralow density of 25 mg/cm3, MXene/ANFs aerogels are proved to possess high compressible resilience and appealing sensing performance up to 1000 times. Importantly, verified by a series of simulation experiments, the MXene/ANFs aerogel sensor shows a wide detection range (2.0-80.0% compression strain), sensitive sensing property (128 kPa-1), and ultralow detection limit (100 Pa), which still play a flexible role in detecting human light movement and even vigorous sports after undergoing ultrahigh devastating pressures (∼623 kPa). In addition, the MXene/ANFs aerogel sensor can withstand a harsh high temperature of 200 °C and shows excellent flame resistance. The MXene/ANFs aerogel with excellent integrated property, especially the highly sensitive sensing property and excellent thermal stability, presents great potential for a human behavior monitoring sensor and sensing under certain extreme conditions.
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Affiliation(s)
- Lin Wang
- College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science & Technology, No. 6, Xuefu Road, Xi'an 710021, China
| | - Meiyun Zhang
- College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science & Technology, No. 6, Xuefu Road, Xi'an 710021, China
| | - Bin Yang
- College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science & Technology, No. 6, Xuefu Road, Xi'an 710021, China
| | - Jiaojun Tan
- College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science & Technology, No. 6, Xuefu Road, Xi'an 710021, China
| | - Xueyao Ding
- College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper Development, Shaanxi University of Science & Technology, No. 6, Xuefu Road, Xi'an 710021, China
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56
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Li X, Wang J, Zhao Y, Zhang X. Superhydrophobic polyimide aerogels via conformal coating strategy with excellent underwater performances. J Appl Polym Sci 2020. [DOI: 10.1002/app.48849] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xin Li
- School of Materials Science and EngineeringBeijing Institute of Technology Beijing 100081 People's Republic of China
- Suzhou Institute of Nano‐Tech and Nano‐BionicsChinese Academy of Sciences Suzhou 215123 People's Republic of China
| | - Jin Wang
- Suzhou Institute of Nano‐Tech and Nano‐BionicsChinese Academy of Sciences Suzhou 215123 People's Republic of China
| | - Yibo Zhao
- Aerospace Research Institute of Materials and Processing Technology Beijing 100076 People's Republic of China
| | - Xuetong Zhang
- Suzhou Institute of Nano‐Tech and Nano‐BionicsChinese Academy of Sciences Suzhou 215123 People's Republic of China
- Department of Surgical Biotechnology, Division of Surgery & Interventional ScienceUniversity College London London NW3 2PF United Kingdom
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57
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Wang J, Fang Q, Ye L, Zhang A, Feng ZG. The intrinsic microstructure of supramolecular hydrogels derived from α-cyclodextrin and pluronic F127: nanosheet building blocks and hierarchically self-assembled structures. SOFT MATTER 2020; 16:5906-5909. [PMID: 32555865 DOI: 10.1039/d0sm00979b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Supramolecular hydrogels derived from the self-assembly of α-cyclodextrin with pluronic F127 were found to be built up with polypseudorotaxane nanosheets with a thickness of 30-40 nm and possessed flower-like hierarchically assembled structures. The findings in this work could provide critical guidance for material design for biomedical purposes.
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Affiliation(s)
- Jin Wang
- Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Chinese Academy of Sciences, Suzhou 215123, P. R. China
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58
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Karamikamkar S, Fashandi M, Naguib HE, Park CB. In Situ Interface Design in Graphene-Embedded Polymeric Silica Aerogel with Organic/Inorganic Hybridization. ACS APPLIED MATERIALS & INTERFACES 2020; 12:26635-26648. [PMID: 32352754 DOI: 10.1021/acsami.0c04531] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
For many practical applications, the most important factor is to have an improved interface between the matrix and dispersed phase in a compressible composite aerogel having a high degree of porosity and a large surface area. Although some measure of compressibility is obtained in polymer-based aerogels with a continuous backbone through the hybridization of the stiff backbone [polyvinyltrimethoxysilane (P-VTMS), -C-C-] and flexible backbone [poly(3-glycidyloxypropyl)trimethoxysilane (P-GPTMS), -C-O-C-], it seems that the extent of improvement is insignificant in terms of interface improvement, surface area increase, and ordered mesoporous network. In this study, the effects of the incorporation of graphene nanoplatelets (GnPs) on aerogels made of a backbone consisting of -C-O-C- (flexible backbone) were examined in terms of structural improvement and were compared with aerogels made of a backbone consisting of -C-C- (stiff backbone). Moreover, the inorganic siloxane cross-link density between the underlying polymer chains was controlled by inducing hydrogen bonding between polymer chains and GnPs. This approach reduces the structural shrinkage during gelation and drying. The integration of only 1 wt % GnP integrated into the backbone by using spinodal decomposition phase separation processing allowed control of the pore size and the surface area. Integration of GnPs through in situ exfoliation during sol-gel transition is shown to be the best approach using the lowest possible amount of GnPs to improve aerogels' mesoporous network made from polymerized GPTMS. A flexible backbone such as P-GPTMS chains is supposed to result in a compliant aerogel, but the chains tend to shrink extensively during gelation and drying, reducing the porosity. P-GPTMS-derived aerogel suffers from a wrong combination of flexible backbone conjugated with an extensive number of permanent chemical cross-links and abundant remaining unreacted hydroxyl groups that undergo permanent chemical shrinkage. To counteract this, the GnP-reinforced prepolymer precursor (P-GPTMS) with fewer siloxane cross-links was synthesized and studied. By use of this strategy, the same elastic properties as those seen with the hybrid P-VTMS- and hybrid P-GPTMS-derived aerogels were imparted, while also improving the mechanical strength by up to 138% and the surface area by up to 205% by controlling the extent of GnP exfoliation during the sol-gel transition. This exceptional effect of GnP on the surface area improvement was shown to be of up to 2.05-fold for P-GPTMS and 2.63-fold for P-VTMS material.
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Affiliation(s)
- Solmaz Karamikamkar
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
- Department of Materials Science and Engineering, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Maryam Fashandi
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Hani E Naguib
- Department of Materials Science and Engineering, Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Chul B Park
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
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59
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Zu G, Wang X, Kanamori K, Nakanishi K. Superhydrophobic highly flexible doubly cross-linked aerogel/carbon nanotube composites as strain/pressure sensors. J Mater Chem B 2020; 8:4883-4889. [PMID: 32149308 DOI: 10.1039/c9tb02953b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We report novel superhydrophobic highly flexible composites based on a doubly cross-linked (DCL) aerogel and carbon nanotubes (CNTs) for strain/pressure sensing. The DCL aerogel/CNT composite is prepared by radical polymerization of vinylmethyldimethoxysilane and vinyldimethylmethoxysilane, respectively, followed by hydrolytic co-polycondensation of the obtained polyvinylmethyldimethoxysilane and polyvinyldimethylmethoxysilane, combined with the incorporation of CNTs. Benefiting from the flexible methyl-rich DCL structure of the aerogel and conductive CNTs, the resultant DCL aerogel/CNT composite combines superhydrophobicity, high compressibility, high bendability, high elasticity, and strain- and pressure-sensitive conductivity. We demonstrate that the composite can be applied as a high-performance strain/pressure sensor for the detection of arterial pulse waves and joint bending with high sensitivity and high durability against humidity.
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Affiliation(s)
- Guoqing Zu
- School of Materials Science and Engineering, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 201804, P. R. China.
| | - Xiaodong Wang
- School of Materials Science and Engineering, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 201804, P. R. China.
| | - Kazuyoshi Kanamori
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kazuki Nakanishi
- Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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60
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Zhang Z, Wang X, Zu G, Liu L, Zhang X, Xi S, Zhao H, Shen J. Effect of different chemical liquid deposition methods on the microstructure and properties of polyimide-polyvinylpolymethylsiloxane composite aerogels. J Supercrit Fluids 2020. [DOI: 10.1016/j.supflu.2020.104811] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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61
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Robust Silica-Cellulose Composite Aerogels with a Nanoscale Interpenetrating Network Structure Prepared Using a Streamlined Process. Polymers (Basel) 2020; 12:polym12040807. [PMID: 32260248 PMCID: PMC7240684 DOI: 10.3390/polym12040807] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Revised: 03/19/2020] [Accepted: 03/23/2020] [Indexed: 12/05/2022] Open
Abstract
Silica aerogels can be strengthened by forming a nanoscale interpenetrating network (IPN) comprising a silica gel skeleton and a cellulose nanofiber network. Previous studies have demonstrated the effectiveness of this method for improving the mechanical properties and drying of aerogels. However, the preparation process is generally tedious and time-consuming. This study aims to streamline the preparation process of these composite aerogels. Silica alcosols were directly diffused into cellulose wet gels with loose, web-like microstructures, and an IPN structure was gradually formed by regulating the gelation rate. Supercritical CO2 drying followed to obtain composite aerogels. The mechanical properties were further enhanced by a simple secondary regulation process that increased the quantity of bacterial cellulose (BC) nanofibers per unit volume of the matrix. This led to the production of aerogels with excellent bendability and a high tensile strength. A maximum breaking stress and tensile modulus of 3.06 MPa and 46.07 MPa, respectively, were achieved. This method can be implemented to produce robust and bendable silica-based composite aerogels (CAs).
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62
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Wang F, Dou L, Dai J, Li Y, Huang L, Si Y, Yu J, Ding B. In situ Synthesis of Biomimetic Silica Nanofibrous Aerogels with Temperature‐Invariant Superelasticity over One Million Compressions. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001679] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Fei Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Lvye Dou
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Jianwu Dai
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Yuyao Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Liqian Huang
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Yang Si
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
- Innovation Center for Textile Science and TechnologyDonghua University Shanghai 200051 China
| | - Jianyong Yu
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
- Innovation Center for Textile Science and TechnologyDonghua University Shanghai 200051 China
| | - Bin Ding
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
- Innovation Center for Textile Science and TechnologyDonghua University Shanghai 200051 China
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63
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Wang F, Dou L, Dai J, Li Y, Huang L, Si Y, Yu J, Ding B. In situ Synthesis of Biomimetic Silica Nanofibrous Aerogels with Temperature‐Invariant Superelasticity over One Million Compressions. Angew Chem Int Ed Engl 2020; 59:8285-8292. [DOI: 10.1002/anie.202001679] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Indexed: 01/25/2023]
Affiliation(s)
- Fei Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Lvye Dou
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Jianwu Dai
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Yuyao Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Liqian Huang
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
| | - Yang Si
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
- Innovation Center for Textile Science and TechnologyDonghua University Shanghai 200051 China
| | - Jianyong Yu
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
- Innovation Center for Textile Science and TechnologyDonghua University Shanghai 200051 China
| | - Bin Ding
- State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of TextilesDonghua University Shanghai 201620 China
- Innovation Center for Textile Science and TechnologyDonghua University Shanghai 200051 China
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64
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Rezaei S, Zolali AM, Jalali A, Park CB. Novel and simple design of nanostructured, super-insulative and flexible hybrid silica aerogel with a new macromolecular polyether-based precursor. J Colloid Interface Sci 2020; 561:890-901. [DOI: 10.1016/j.jcis.2019.11.072] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 11/14/2019] [Accepted: 11/16/2019] [Indexed: 01/19/2023]
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65
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Advances in precursor system for silica-based aerogel production toward improved mechanical properties, customized morphology, and multifunctionality: A review. Adv Colloid Interface Sci 2020; 276:102101. [PMID: 31978639 DOI: 10.1016/j.cis.2020.102101] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 12/08/2019] [Accepted: 01/06/2020] [Indexed: 11/23/2022]
Abstract
Conventional silica-based aerogels are among the most promising materials considering their special properties, such as extremely low thermal conductivity (~15 mW/mK) and low-density (∼0.003-0.5 g.cm-3) as well as high surface area (500-1200 m2. g-1). However, they have relatively low mechanical properties and entail extensive and energy-consuming processing steps. Silica-based aerogels are mostly fragile and possess minimal mechanical properties as well as a long processing procedure which hinders their application range. The key point in improving the mechanical properties of such a material is to increase the connectivity in the aerogel backbone. Several methods of mechanical improvement of silica-based aerogels have been explored by researchers such as (i) use of flexible silica precursors in silica gel backbone, (ii) surface-crosslinking of silica particles with a polymer, (iii) prolonged aging step in different solutions, (iv) distribution of flexible nanofillers into the silica solution prior to gelation, and, most recently, (v) polymerizing the silica precursor prior to gelation. The polymerized silica precursor, as in the most recent approach, can be gelled either by binodal decomposition (nucleation and growth), resulting in a particulate structure, or by spinodal decomposition, resulting in a non-particulate structure. By optimizing the material composition and processing conditions of materials, the aerogel can be tailored with different functional capabilities. This review paper presents a literature survey of precursor modification toward increased connectivity in the backbone, and the synthesis of inorganic and hybrid systems containing siloxane in the backbone of the silica-based aerogels and its composite version with carbon nanofillers. This review also explains the novel properties and applications of these material systems in a wide area. The relationship among the materials-processing-structure-properties in these kinds of aerogels is the most important factor in the development of aerogel products with given morphologies (particulate, fiber-like, or non-particulate) and their resultant properties. This approach to advancing precursor systems leads to the next-generation, multifunctional silica-based aerogel materials.
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Hu P, Lyu J, Fu C, Gong WB, Liao J, Lu W, Chen Y, Zhang X. Multifunctional Aramid Nanofiber/Carbon Nanotube Hybrid Aerogel Films. ACS NANO 2020; 14:688-697. [PMID: 31851483 DOI: 10.1021/acsnano.9b07459] [Citation(s) in RCA: 105] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Lightweight, robust, and thin aerogel films with multifunctionality are highly desirable to meet the technological demands of current society. However, fabrication and application of these multifunctional aerogel films are still significantly underdeveloped. Herein, we demonstrate a multifunctional aerogel film composed of strong aramid nanofibers (ANFs), conductive carbon nanotubes (CNTs), and hydrophobic fluorocarbon (FC) resin. The obtained hybrid aerogel film exhibits large specific surface area (232.8 m2·g-1), high electrical conductivity (230 S·m-1), and excellent hydrophobicity (contact angle of up to 137.0°) with exceptional Joule heating performance and supreme electromagnetic interference (EMI) shielding efficiency. The FC coating renders the hydrophilic ANF/CNT aerogel films hydrophobic, resulting in an excellent self-cleaning performance. The high electrical conductivity enables a low-voltage-driven Joule heating property and an EMI shielding effectiveness (SE) of 54.4 dB in the X-band at a thickness of 568 μm. The specific EMI SE is up to 33528.3 dB·cm2·g-1, which is among the highest values of typical metal-, conducting-polymer-, or carbon-based composites. This multifunctional aerogel film holds great promise for smart garments, electromagnetic wave shielding, and personal thermal management systems.
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Affiliation(s)
- Peiying Hu
- Department of Polymer Materials and Engineering, School of Materials Science and Engineering , Hainan University , 58 Renmin Avenue , Haikou 570228 , P.R. China
- Suzhou Institute of Nano-tech and Nano-bionics , Chinese Academy of Sciences , Suzhou 215123 , P.R. China
| | - Jing Lyu
- Suzhou Institute of Nano-tech and Nano-bionics , Chinese Academy of Sciences , Suzhou 215123 , P.R. China
| | - Chen Fu
- Suzhou Institute of Nano-tech and Nano-bionics , Chinese Academy of Sciences , Suzhou 215123 , P.R. China
| | - Wen-Bin Gong
- Suzhou Institute of Nano-tech and Nano-bionics , Chinese Academy of Sciences , Suzhou 215123 , P.R. China
| | - Jianhe Liao
- Department of Polymer Materials and Engineering, School of Materials Science and Engineering , Hainan University , 58 Renmin Avenue , Haikou 570228 , P.R. China
| | - Weibang Lu
- Suzhou Institute of Nano-tech and Nano-bionics , Chinese Academy of Sciences , Suzhou 215123 , P.R. China
| | - Yongping Chen
- Department of Polymer Materials and Engineering, School of Materials Science and Engineering , Hainan University , 58 Renmin Avenue , Haikou 570228 , P.R. China
| | - Xuetong Zhang
- Suzhou Institute of Nano-tech and Nano-bionics , Chinese Academy of Sciences , Suzhou 215123 , P.R. China
- Department of Surgical Biotechnology, Division of Surgery & Interventional Science , University College London , London NW3 2PF , United Kingdom
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Zhang Y, Shen Q, Li X, Xie H, Nie C. Facile synthesis of ternary flexible silica aerogels with coarsened skeleton for oil–water separation. RSC Adv 2020; 10:42297-42304. [PMID: 35516755 PMCID: PMC9057917 DOI: 10.1039/d0ra07906e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 10/29/2020] [Indexed: 12/25/2022] Open
Abstract
The effect of the skeleton morphology on the properties of flexible silica aerogels.
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Affiliation(s)
- Yu Zhang
- School of Materials and Energy
- Southwest University
- Chongqing
- China
| | - Qianqian Shen
- School of Materials and Energy
- Southwest University
- Chongqing
- China
| | - Xuesha Li
- School of Materials and Energy
- Southwest University
- Chongqing
- China
| | - Hongmei Xie
- College of Materials Science and Engineering
- Yangtze Normal University
- Chongqing
- China
| | - Chaoyin Nie
- School of Materials and Energy
- Southwest University
- Chongqing
- China
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68
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Zu G, Kanamori K, Nakanishi K, Lu X, Yu K, Huang J, Sugimura H. Superelastic Multifunctional Aminosilane-Crosslinked Graphene Aerogels for High Thermal Insulation, Three-Component Separation, and Strain/Pressure-Sensing Arrays. ACS APPLIED MATERIALS & INTERFACES 2019; 11:43533-43542. [PMID: 31674184 DOI: 10.1021/acsami.9b16746] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Aerogels have attracted great interest for their unique properties, but their mechanical brittleness and poor functionality highly limit their practical applications. Herein, we report unprecedented superelastic multifunctional aminosilane-crosslinked reduced graphene oxide (AC-rGO) aerogels that are prepared via a facile and scalable strategy involving simultaneous crosslinking and reducing of graphene oxide nanosheets with different kinds of aminosilanes via C-N coupling and hydrolytic polycondensation reactions. It is found that 3-aminopropyl(diethoxy)methylsilane (APDEMS) is the better choice to enhance hydrophobicity, elasticity, and other properties of the resulting aerogels compared with (3-aminopropyl)triethoxysilane. One APDEMS molecule plays three roles as a crosslinker, a reductant, and a hydrophobizing agent. An outstanding combination of high surface area, ultralow density, superhydrophobicity, supercompressibility, superelasticity, low thermal conductivity, ultrahigh absorption capacity for organic liquids, efficient three-component separation, and strain/pressure sensing has been achieved in a single APDEMS-crosslinked rGO aerogel for the first time. In addition, a flexible, highly sensitive, and moisture-resistant AC-rGO aerogel-based strain/pressure-sensing array for the effective detection of strain (0-80%)/pressure (10 Pa to 10 kPa) distributions and object shapes has been demonstrated.
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Affiliation(s)
- Guoqing Zu
- School of Materials Science and Engineering , Tongji University , Shanghai 201804 , P. R. China
| | | | - Kazuki Nakanishi
- Institute of Materials and Systems for Sustainability , Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8601 , Japan
| | | | | | - Jia Huang
- School of Materials Science and Engineering , Tongji University , Shanghai 201804 , P. R. China
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Yang J, Li Y, Zheng Y, Xu Y, Zheng Z, Chen X, Liu W. Versatile Aerogels for Sensors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1902826. [PMID: 31475442 DOI: 10.1002/smll.201902826] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/02/2019] [Indexed: 05/27/2023]
Abstract
Aerogels are unique solid-state materials composed of interconnected 3D solid networks and a large number of air-filled pores. They extend the structural characteristics as well as physicochemical properties of nanoscale building blocks to macroscale, and integrate typical characteristics of aerogels, such as high porosity, large surface area, and low density, with specific properties of the various constituents. These features endow aerogels with high sensitivity, high selectivity, and fast response and recovery for sensing materials in sensors such as gas sensors, biosensors and strain and pressure sensors, among others. Considerable research efforts in recent years have been devoted to the development of aerogel-based sensors and encouraging accomplishments have been achieved. Herein, groundbreaking advances in the preparation, classification, and physicochemical properties of aerogels and their sensing applications are presented. Moreover, the current challenges and some perspectives for the development of high-performance aerogel-based sensors are summarized.
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Affiliation(s)
- Jing Yang
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Yi Li
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Yuanyuan Zheng
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Yingming Xu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China
| | - Zhikun Zheng
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Xudong Chen
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Wei Liu
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
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Rege A, Voepel P, Okumus E, Hillgärtner M, Itskov M, Milow B. Temperature-Dependent Stiffening and Inelastic Behavior of Newly Synthesized Fiber-Reinforced Super Flexible Silica Aerogels. MATERIALS 2019; 12:ma12182878. [PMID: 31489902 PMCID: PMC6766033 DOI: 10.3390/ma12182878] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 08/19/2019] [Accepted: 09/03/2019] [Indexed: 11/16/2022]
Abstract
In recent years, flexible silica aerogels have gained significant attention, owing to their excellent thermal and acoustic insulation properties accompanied by mechanical flexibility. Fiber reinforcement of such aerogels results in a further enhancement of the strength and durability of the composite, while retaining the excellent insulation properties. In this paper, the influence of four different kinds of fibers within a flexible silica aerogel matrix is studied and reported. First, a description of the synthesis procedure and the resulting morphology of the four aerogel composites is presented. Their mechanical behavior under uniaxial quasi-static tension and compression is investigated, particularly their performance under uniaxial compression at different temperature conditions (50 °C, 0 °C, and −50 °C). The reinforcement of the flexible silica aerogels with four different fiber types only marginally influences the thermal conductivity but strongly enhances their mechanical properties.
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Affiliation(s)
- Ameya Rege
- Institute of Materials Research, German Aerospace Center, Linder Höhe, 51147 Cologne, Germany.
| | - Pascal Voepel
- Institute of Materials Research, German Aerospace Center, Linder Höhe, 51147 Cologne, Germany.
| | - Emrah Okumus
- Institute of Materials Research, German Aerospace Center, Linder Höhe, 51147 Cologne, Germany.
- Department of Continuum Mechanics, RWTH Aachen University, Kackertstr. 9, 52072 Aachen, Germany.
| | - Markus Hillgärtner
- Department of Continuum Mechanics, RWTH Aachen University, Kackertstr. 9, 52072 Aachen, Germany.
| | - Mikhail Itskov
- Department of Continuum Mechanics, RWTH Aachen University, Kackertstr. 9, 52072 Aachen, Germany.
| | - Barbara Milow
- Institute of Materials Research, German Aerospace Center, Linder Höhe, 51147 Cologne, Germany.
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Yin Q, Tu S, Chen M, Wu L. Novel Polymeric Organosilica Precursor and Emulsion Stabilizer: Toward Highly Elastic Hollow Organosilica Nanospheres. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11524-11532. [PMID: 31398975 DOI: 10.1021/acs.langmuir.9b02062] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The fabrication of hollow organosilica nanoparticles with high elasticity is greatly desirable but still challenging. Herein, we present a new and simple strategy to prepare such nanoparticles by using hyperbranched polyvinylpolytrimethoxysilane (PVPMS) via a soap-free oil in water (O/W) emulsion system. PVPMS was synthesized through the radical polymerization of vinyltrimethoxysilane (VMS) followed by the acid-catalyzed hydrolytic polycondensation of trimethoxysilyl groups, which works not only as an organosilica precursor but also as a sole emulsion stabilizer due to its hydrolysis-induced amphiphilicity at the oil/water interface. When styrene was used as the oil phase and initiated to polymerize, hybrid polystyrene (PS) core-organosilica shell (PS@organosilica) nanoparticles were obtained by controlling the reaction conditions. Furthermore, highly elastic hollow organosilica nanospheres with low Young's modulus (∼220 MPa) were yielded through solvent etching of the core. This study expands the scope of organosilica precursor from small molecule organosilane to polymeric macromolecule and provides useful guidance for application in other polyorganosilsesquioxane related hybrid organosilica particles and functional hollow nanoparticles.
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Affiliation(s)
- Quanyi Yin
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China , Fudan University , Shanghai 200433 , China
| | - Shuhua Tu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China , Fudan University , Shanghai 200433 , China
| | - Min Chen
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China , Fudan University , Shanghai 200433 , China
| | - Limin Wu
- Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Advanced Coatings Research Center of Ministry of Education of China , Fudan University , Shanghai 200433 , China
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73
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Xie C, He L, Shi Y, Guo ZX, Qiu T, Tuo X. From Monomers to a Lasagna-like Aerogel Monolith: An Assembling Strategy for Aramid Nanofibers. ACS NANO 2019; 13:7811-7824. [PMID: 31287660 DOI: 10.1021/acsnano.9b01955] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The manipulation of nanobuilding blocks into a 3D macroscopic monolith with ordered hierarchical structures has been much desired for broad and large-scale practical applications of nanoarchitectures. In this paper, we demonstrate a fully bottom-up strategy for the preparation of aramid aerogel monoliths. The process starts from the synthesis of poly(p-phenylene terephthalamide) (PPTA) through the polycondensation of p-phenylenediamine and terephthaloyl chloride, with the assistance of a nonreactive dispersing agent (polyethylene glycol dimethyl ether), which helps the dispersal of the as-synthesized PPTA in an aqueous medium for the formation of p-aramid nanofibers (ANF). Then the vacuum-assisted self-assembly (Vas) technique is skillfully connected with the ice-templated directional solidification (I) technique, and the combined VasI method successfully tailors the self-assembly of ANF to transform the 1D nanofibers into a 3D aerogel monolith with a specific long-range aligned, lasagna-like, multilaminated internal structure. The study of the aerogel microstructure revealed the dependence of the lamina orientation on the direction of the freezing front of ice crystals. This direction should be parallel to the deposition plane of the Vas process if a long-range aligned lamellar structure is desired. The anisotropy of the multilaminated aerogel was proven by the different results in the radial and axial directions in the compression and thermal conductivity tests. As a kind of organic aerogel, the ANF monolith has typical low density, high porosity, and low thermal conductivity. Additionally, the ANF monolith exhibits high compressive stress and excellent thermal stability. Considering its high performance and facile preparation process, potential applications of the ANF aerogel monolith can be expected.
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Affiliation(s)
- Chunjie Xie
- Key Laboratory of Advanced Materials (MOE), Department of Chemical Engineering , Tsinghua University , No.1, Tsinghua Garden , Haidian District, Beijing 100084 , P.R. China
| | - Lianyuan He
- Key Laboratory of Advanced Materials (MOE), Department of Chemical Engineering , Tsinghua University , No.1, Tsinghua Garden , Haidian District, Beijing 100084 , P.R. China
| | - Yifei Shi
- Key Laboratory of Advanced Materials (MOE), Department of Chemical Engineering , Tsinghua University , No.1, Tsinghua Garden , Haidian District, Beijing 100084 , P.R. China
| | - Zhao-Xia Guo
- Key Laboratory of Advanced Materials (MOE), Department of Chemical Engineering , Tsinghua University , No.1, Tsinghua Garden , Haidian District, Beijing 100084 , P.R. China
| | - Teng Qiu
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education , Beijing University of Chemical Technology , No.15, North Third Ring Road , Chaoyang District, Beijing 100029 , P.R. China
| | - Xinlin Tuo
- Key Laboratory of Advanced Materials (MOE), Department of Chemical Engineering , Tsinghua University , No.1, Tsinghua Garden , Haidian District, Beijing 100084 , P.R. China
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Wang L, Song G, Qiao X, Xiong G, Liu Y, Zhang J, Guo R, Chen G, Zhou Z, Li Q. Facile Fabrication of Flexible, Robust, and Superhydrophobic Hybrid Aerogel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8692-8698. [PMID: 31181884 DOI: 10.1021/acs.langmuir.9b00521] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Silica aerogels, which are constructed with silica nanoparticles and numerous nanoscale pores, have many outstanding attributes, but they are usually brittle and hydrophilic. For the construction of a robust aerogel, the novel polyhedral oligomeric silsesquioxane (POSS) was introduced to prepare a series of aerogels possessing particles covered with elastic cushion to improve the mechanical property. The multialkoxy POSS, which possessed stiff Si-O-Si nanocages and flexible alkyl chains, was synthesized via thiol-ene click chemistry. After a facile and efficient approach, a partially ordered structure of SiO2 nanoparticles and organic elastic cushion would form spontaneously within the aerogels. With the POSS as the only precursor, several outstanding attributes were achieved in a single aerogel such as high specific surface area (SSA), high compression strength, high compression modulus, and noticeable compression flexibility. Meanwhile, the aerogel was superhydrophobic of which the contact angle (CA) was higher than 153°. Moreover, the potential application of oil-water separation is also presented.
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Affiliation(s)
- Linbin Wang
- State Key Laboratory of Chemical Resource Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Guomin Song
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Xuxu Qiao
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Gang Xiong
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Yuemin Liu
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Jiancheng Zhang
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Ruilu Guo
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Guangxin Chen
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education , Beijing University of Chemical Technology , Beijing 100029 , P.R. China
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Zheng Zhou
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education , Beijing University of Chemical Technology , Beijing 100029 , P.R. China
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
| | - Qifang Li
- State Key Laboratory of Chemical Resource Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
- College of Material Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China
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Rezaei S, Jalali A, Zolali AM, Alshrah M, Karamikamkar S, Park CB. Robust, ultra-insulative and transparent polyethylene-based hybrid silica aerogel with a novel non-particulate structure. J Colloid Interface Sci 2019; 548:206-216. [DOI: 10.1016/j.jcis.2019.04.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 04/03/2019] [Accepted: 04/08/2019] [Indexed: 01/10/2023]
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Yamasaki S, Sakuma W, Yasui H, Daicho K, Saito T, Fujisawa S, Isogai A, Kanamori K. Nanocellulose Xerogels With High Porosities and Large Specific Surface Areas. Front Chem 2019; 7:316. [PMID: 31134187 PMCID: PMC6514048 DOI: 10.3389/fchem.2019.00316] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 04/23/2019] [Indexed: 12/01/2022] Open
Abstract
Xerogels are defined as porous structures that are obtained by evaporative drying of wet gels. One challenge is producing xerogels with high porosity and large specific surface areas, which are structurally comparable to supercritical-dried aerogels. Herein, we report on cellulose xerogels with a truly aerogel-like porous structure. These xerogels have a monolithic form with porosities and specific surface areas in the ranges of 71-76% and 340-411 m2/g, respectively. Our strategy is based on combining three concepts: (1) the use of a very fine type of cellulose nanofibers (CNFs) with a width of ~3 nm as the skeletal component of the xerogel; (2) increasing the stiffness of wet CNF gels by reinforcing the inter-CNF interactions to sustain their dry shrinkage; and (3) solvent-exchange of wet gels with low-polarity solvents, such as hexane and pentane, to reduce the capillary force on drying. The synergistic effects of combining these approaches lead to improvements in the porous structure in the CNF xerogels.
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Affiliation(s)
- Shunsuke Yamasaki
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Wataru Sakuma
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Hiroaki Yasui
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Kazuho Daicho
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Tsuguyuki Saito
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Shuji Fujisawa
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Akira Isogai
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
| | - Kazuyoshi Kanamori
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto, Japan
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Chen D, Gao H, Liu P, Huang P, Huang X. Directly ambient pressure dried robust bridged silsesquioxane and methylsiloxane aerogels: effects of precursors and solvents. RSC Adv 2019; 9:8664-8671. [PMID: 35518656 PMCID: PMC9061811 DOI: 10.1039/c8ra08646j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 03/09/2019] [Indexed: 01/30/2023] Open
Abstract
Robust low-cost silica based aerogels can be obtained by choosing appropriate silane precursors and chemical conditions. In this paper, we synthesized two kinds of bridged siloxane precursors, bridged silsesquioxane (BSQ) from (3-aminopropyl)-triethoxysilane (APTES) and m-phthalaldehyde (MPA), and bridged methylsiloxane (BMSQ) from (3-aminopropyl)-diethoxymethylsilane (APDEMS) and m-phthalaldehyde (MPA) to prepare robust aerogels. Methanol and ethanol were used individually as solvents in the experiment and all the products were dried directly at ambient pressure without any solvent exchange process. All the products show low densities (about 0.15 g cm-3) and large porosities (larger than 80%). The influence of the precursor and solvent was investigated. The BSQ aerogels have larger specific surface areas, smaller pore sizes and more stable mechanical performances. Aerogels prepared using methanol as the solvent gel faster and have larger pore sizes. The solvent has greater impacts on the BSQ aerogels, the BSQ aerogels prepared using ethanol as the solvent can withstand 60% deformation in repeated compression tests, exhibiting good mechanical performance.
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Affiliation(s)
- Dangjia Chen
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing No. 30, Xueyuan Road, Haidian District Beijing 100083 PR China +86-10-62333765
| | - Hongyi Gao
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing No. 30, Xueyuan Road, Haidian District Beijing 100083 PR China +86-10-62333765
| | - Panpan Liu
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing No. 30, Xueyuan Road, Haidian District Beijing 100083 PR China +86-10-62333765
| | - Pei Huang
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing No. 30, Xueyuan Road, Haidian District Beijing 100083 PR China +86-10-62333765
| | - Xiubing Huang
- Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing No. 30, Xueyuan Road, Haidian District Beijing 100083 PR China +86-10-62333765
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Strong, compressible, bendable and stretchable silicone sponges by solvent-controlled hydrolysis and polycondensation of silanes. J Colloid Interface Sci 2019; 540:554-562. [DOI: 10.1016/j.jcis.2019.01.059] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 01/11/2019] [Accepted: 01/12/2019] [Indexed: 01/14/2023]
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79
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Zhu J, Hu J, Jiang C, Liu S, Li Y. Ultralight, hydrophobic, monolithic konjac glucomannan-silica composite aerogel with thermal insulation and mechanical properties. Carbohydr Polym 2019; 207:246-255. [DOI: 10.1016/j.carbpol.2018.11.073] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 11/04/2018] [Accepted: 11/22/2018] [Indexed: 02/08/2023]
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80
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Gun'ko VM, Turov VV, Krupska TV, Protsak IS, Borysenko MV, Pakhlov EM. Polymethylsiloxane alone and in composition with nanosilica under various conditions. J Colloid Interface Sci 2019; 541:213-225. [PMID: 30690265 DOI: 10.1016/j.jcis.2019.01.102] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Revised: 01/22/2019] [Accepted: 01/23/2019] [Indexed: 02/08/2023]
Abstract
Disperse polymethylsiloxane (PMS) alone and in a mixture with highly disperse nanosilica A-300 was studied as a dry powder and a hydrogel located in various dispersion media (air, chloroform alone and with addition of trifluoroacetic acid) using low-temperature 1H NMR spectroscopy, cryoporometry, thermogravimetry, nitrogen adsorption, microscopy, infrared spectroscopy, and quantum chemistry. The powders of dried PMS and PMS/A-300 can be easily rehydrated upon strong stirring with added water. The slurry properties depend on mechanical treatment features due to stronger compaction of the secondary structures with increasing mechanical loading. The organization of bound water (at a constant hydration degree h = 1 g/g) depends strongly on the dispersion media (because chloroform can displace water from narrow interparticle voids into broader ones or into pores inaccessible for larger CDCl3 molecules) and mechanical loading reorganizing aggregates of PMS and A-300 nanoparticles (<1 μm in size) and agglomerates (>1 μm) of aggregates. The PMS/nanosilica blends could be of interest from a practical point of view due to additional control of the textural and structural characteristics determining efficiency of sorbents with respect to low- and high-molecular weight compounds depending on the dispersion media that is of importance, e.g., for medical applications.
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Affiliation(s)
- V M Gun'ko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kyiv 03164, Ukraine.
| | - V V Turov
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kyiv 03164, Ukraine
| | - T V Krupska
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kyiv 03164, Ukraine
| | - I S Protsak
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kyiv 03164, Ukraine
| | - M V Borysenko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kyiv 03164, Ukraine
| | - E M Pakhlov
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, Kyiv 03164, Ukraine
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81
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Wang L, Feng J, Jiang Y, Li L, Feng J. Elastic methyltrimethoxysilane based silica aerogels reinforced with polyvinylmethyldimethoxysilane. RSC Adv 2019; 9:10948-10957. [PMID: 35515298 PMCID: PMC9062614 DOI: 10.1039/c9ra00970a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 04/02/2019] [Indexed: 11/21/2022] Open
Abstract
Native silica aerogels are fragile and brittle, which prevents their wider utility. For designing more durable and stronger silica aerogels, polyvinylmethyldimethoxysilane (PVMDMS) polymers as effective and multifunctional reinforcing agents were used to strengthen methyltrimethoxysilane based silica aerogels (MSAs). The PVMDMS polymer, which was composed of long-chain aliphatic hydrocarbons and organic side-chain methyl and alkoxysilane groups, was integrated into silica networks via a simple sol–gel process. Compared with MSAs, PVMDMS reinforced MSAs (PRMSAs) display many fascinating characteristics. PRMSAs exhibit improved hydrophobic properties (water contact angle of 136.9°) due to abundant methyl groups in the silica networks. Benefiting from the fine integration of PVMDMS polymers into MSAs, PRMSAs show a perfectly elastic recovery property, the compressive strength of which ranges from 0.19 to 1.98 MPa. More importantly, PVMDMS polymers have successfully suppressed the growth of secondary particles. Homogeneous silica networks formed by nanoscale particles give PRMSAs a high surface area of 1039 m2 g−1. Moreover, optimized PRMSAs also exhibit a low thermal conductivity of 0.0228 W m−1 K−1 under ambient conditions, and their thermal stability reaches up to 222.3 °C in air. All the results obtained from this paper will help us to design silica aerogels. For designing more durable and stronger silica aerogels, elastic polyvinylmethyldimethoxysilane reinforced silica aerogels have been prepared successfully.![]()
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Affiliation(s)
- Lukai Wang
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- P. R. China
| | - Junzong Feng
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- P. R. China
| | - Yonggang Jiang
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- P. R. China
| | - Liangjun Li
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- P. R. China
| | - Jian Feng
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- P. R. China
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82
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Zu G, Kanamori K, Maeno A, Kaji H, Nakanishi K, Shen J. Ambient-dried highly flexible copolymer aerogels and their nanocomposites with polypyrrole for thermal insulation, separation, and pressure sensing. Polym Chem 2019. [DOI: 10.1039/c9py00751b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly flexible copolymer and copolymer/polypyrrole nanocomposite aerogels have been synthesized via ambient pressure drying for superinsulation, separation and pressure sensing.
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Affiliation(s)
- Guoqing Zu
- School of Materials Science and Engineering
- Tongji University
- Shanghai 201804
- P. R. China
| | | | - Ayaka Maeno
- Institute for Chemical Research
- Kyoto University Gokasho
- Uji
- Japan
| | - Hironori Kaji
- Institute for Chemical Research
- Kyoto University Gokasho
- Uji
- Japan
| | - Kazuki Nakanishi
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Japan
| | - Jun Shen
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology
- Pohl Institute of Solid State Physics
- Tongji University
- Shanghai 200092
- P. R. China
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83
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Karamikamkar S, Abidli A, Behzadfar E, Rezaei S, Naguib HE, Park CB. The effect of graphene-nanoplatelets on gelation and structural integrity of a polyvinyltrimethoxysilane-based aerogel. RSC Adv 2019; 9:11503-11520. [PMID: 35520268 PMCID: PMC9063430 DOI: 10.1039/c9ra00994a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 03/20/2019] [Indexed: 11/21/2022] Open
Abstract
Aerogels suffer greatly from poor mechanical properties resulting from their particulate structure. They also experience noticeable pore shrinkage during drying due to their low structural integrity. These shortfalls limit their broad application. To enhance the mechanical properties and improve the structural integrity of silica-based aerogels, graphene nanoplatelets (GnPs), as a nanofiller, were embedded into the solution of polymerized vinyltrimethoxysilane (VTMS) to prepare P-VTMS-based silica/GnP (PE-b-Si/GnP) hybrid aerogel monoliths based on sol–gel synthesis and supercritical drying. The inclusion of GnPs in our polymer-based silica aerogel processes reinforced the nanostructure and suppressed PE-b-Si nanopore shrinkage during supercritical drying, thus acting as an effective anti-shrinkage nanofiller. Accordingly, the GnPs significantly contributed to the PE-b-Si solution's uniform gelation and to the change of the hydrophilic nature to a hydrophobic one even with 1 wt% addition. In this study, the influence of the GnP content on the sol–gel process, structure, and physical properties of PE-based silica aerogels is studied. Aerogels suffer greatly from poor mechanical properties resulting from their particulate structure.![]()
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Affiliation(s)
- Solmaz Karamikamkar
- Microcellular Plastics Manufacturing Laboratory
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
| | - Abdelnasser Abidli
- Microcellular Plastics Manufacturing Laboratory
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
| | - Ehsan Behzadfar
- Department of Chemical Engineering
- Lakehead University
- Thunder Bay
- Canada P7B 5E1
| | - Sasan Rezaei
- Microcellular Plastics Manufacturing Laboratory
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
| | - Hani E. Naguib
- Smart Polymers & Composites Lab
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
| | - Chul B. Park
- Microcellular Plastics Manufacturing Laboratory
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
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84
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Wang L, Feng J, Jiang Y, Li L, Feng J. Thermal conductivity of polyvinylpolymethylsiloxane aerogels with high specific surface area. RSC Adv 2019; 9:7833-7841. [PMID: 35521213 PMCID: PMC9061252 DOI: 10.1039/c8ra10493j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2018] [Accepted: 03/04/2019] [Indexed: 12/05/2022] Open
Abstract
The traditional SiO2 aerogels are difficult to apply in the fields of energy storage and heat insulation due to their poor mechanical properties. In order to deal with this issue, the polyvinylpolymethylsiloxane aerogel (PVPMSA) materials with fine mechanical flexibility and excellent thermal insulation properties are suitable substitutions. In this paper, the double cross-linking organic–inorganic hybrid PVPMSAs were prepared through the processes of free radical polymerization and hydrolytic polycondensation. The internal silica network reinforced with aliphatic hydrocarbons has significantly improved the mechanical properties and acquired a high specific surface area, reaching up to 1218 m2 g−1. Furthermore, the thermal conductivity of monolithic PVPMSAs has been investigated by changing the density and environmental conditions. Results show that PVPMSAs at 25 °C in 5 Pa have a thermal conductivity as low as 14.69 mW m−1 K−1, and the solid thermal conductivity shows a flat growth with the increase of density. Meanwhile, the nanosize pores could significantly inhibit the heat transfer of gas. As for the radiative thermal conductivity, it is greatly affected by temperature. All these results obtained from this paper would help us to design thermal insulators reasonably. The traditional SiO2 aerogels are difficult to apply in the fields of energy storage and heat insulation due to their poor mechanical properties.![]()
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Affiliation(s)
- Lukai Wang
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- People's Republic of China
| | - Junzong Feng
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- People's Republic of China
| | - Yonggang Jiang
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- People's Republic of China
| | - Liangjun Li
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- People's Republic of China
| | - Jian Feng
- Science and Technology on Advanced Ceramic Fibers and Composites Laboratory
- College of Aerospace Science and Engineering
- National University of Defense Technology
- Changsha
- People's Republic of China
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85
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Rizvi A, Chu RKM, Park CB. Scalable Fabrication of Thermally Insulating Mechanically Resilient Hierarchically Porous Polymer Foams. ACS APPLIED MATERIALS & INTERFACES 2018; 10:38410-38417. [PMID: 30360118 DOI: 10.1021/acsami.8b11375] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The requirement of energy efficiency demands materials with superior thermal insulation properties. Inorganic aerogels are excellent thermal insulators, but are difficult to produce on a large-scale, are mechanically brittle, and their structural properties depend strongly on their density. Here, we report the scalable generation of low-density, hierarchically porous, polypropylene foams using industrial-scale foam-processing equipment, with thermal conductivity lower than that of commercially available high-performance thermal insulators such as superinsulating Styrofoam. The reduction in thermal conductivity is attributed to the restriction of air flow caused by the porous nanostructure in the cell walls of the foam. In contrast to inorganic aerogels, the mechanical properties of the foams are less sensitive to density, suggesting efficient load transfer through the skeletal structure. The scalable fabrication of hierarchically porous polymer foams opens up new perspectives for the scalable design and development of novel superinsulating materials.
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Affiliation(s)
- Ali Rizvi
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering , University of Toronto , 5 King's College Road , Toronto , Ontario M5S 3G8 , Canada
| | - Raymond K M Chu
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering , University of Toronto , 5 King's College Road , Toronto , Ontario M5S 3G8 , Canada
| | - Chul B Park
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering , University of Toronto , 5 King's College Road , Toronto , Ontario M5S 3G8 , Canada
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86
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Tian Y, Feng J, Wang X, Luo C, Maloko Loussala H, Sun M. An organic-inorganic hybrid silica aerogel prepared by co-precursor method for solid-phase microextraction coating. Talanta 2018; 194:370-376. [PMID: 30609545 DOI: 10.1016/j.talanta.2018.10.056] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 10/08/2018] [Accepted: 10/17/2018] [Indexed: 12/26/2022]
Abstract
In order to improve the extraction performance of silica aerogel, an organic-inorganic hybrid silica aerogel was developed as the coating of solid-phase microextraction (SPME). It was prepared via the co-precursor reaction between tris(triethoxysilylpropyl)amine and tetraethyl orthosilicate. Coupled with gas chromatography, the hybrid silica aerogel-coated SPME fiber was evaluated using polycyclic aromatic hydrocarbons (PAHs). Compared to silica aerogel, the hybrid silica aerogel displayed better extraction performance, peak areas of PAH analytes were increased by about 2 times. The affecting parameters including extraction time, extraction temperature, ionic strength, stirring rate and desorption time were optimized, and an analytical method was established with wide linear ranges (0.005-20 μg L-1, 0.010-20 μg L-1, 0.100-20 μg L-1), good correlation coefficients (0.9967-0.9994), low limits of detection (0.001-0.030 μg L-1) and limits of quantitation (0.005-0.100 μg L-1). Satisfactory extraction repeatability (RSD≤6.1%, n = 3) and preparation repeatability (RSD ≤ 9.8%, n = 3) were also obtained. Compared to the reported coatings and the commercial coating, the organic-inorganic hybrid silica aerogel has higher or comparable sensitivity, better repeatability, and shorter extraction time and longer service life. The established method was used for the detection of lake water and rain water, and some targets were quantified successfully.
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Affiliation(s)
- Yu Tian
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Juanjuan Feng
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Xiuqin Wang
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Chuannan Luo
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Herman Maloko Loussala
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Min Sun
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
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87
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Maleki H, Whitmore L, Hüsing N. Novel multifunctional polymethylsilsesquioxane-silk fibroin aerogel hybrids for environmental and thermal insulation applications. JOURNAL OF MATERIALS CHEMISTRY. A 2018; 6:12598-12612. [PMID: 30713688 PMCID: PMC6333272 DOI: 10.1039/c8ta02821d] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/08/2018] [Indexed: 05/16/2023]
Abstract
The development of aerogels with improved mechanical properties, to expand their utility in high-performance applications, is still a big challenge. Besides fossil-fuel based polymers that have been extensively utilized as platforms to enhance the mechanical strength of silsesquioxane and silica-based aerogels, using green biopolymers from various sustainable renewable resources are currently drawing significant attention. In this work, we process silk fibroin (SF) proteins, extracted from silkworm cocoons, with organically substituted alkoxysilanes in an entirely aqueous based solution via a successive sol-gel approach, and show for the first time that it is possible to produce homogeneous interpenetrated (IPN) polymethylsilsesquioxane (PMSQ)-SF hybrid aerogel monoliths with significantly improved mechanical properties. Emphasis is given to an improvement of the molecular interaction of the two components (SF biopolymer and PMSQ) using a silane coupling agent and to the design of pore structure. We succeeded in developing a novel class of compressible, light-weight, and hierarchically organized meso-macroporous PMSQ-SF IPN hybrid aerogels by carefully controlling the sol-gel parameters at a molecular level. Typically, these aerogels have a compressive strength (δ max) of up to 14 MPa, together with high flexibility in both compression and bending, compressibility up to 80% strain with very low bulk density (ρ b) of 0.08-0.23 g cm-3. By considering these promising properties, the superhydrophobic/oleophilic PMSQ-SF aerogel hybrids exhibited a high competency for selective absorption of a variety of organic pollutants (absorption capacities ∼500-2600 g g-1 %) from water and acted as a high-performance filter for continuous water/oil separation. Moreover, they have demonstrated impressive thermal insulation performance (λ = 0.032-0.044 W m-1 K-1) with excellent fire retardancy and self-extinguishing capabilities. Therefore, the PMSQ-SF aerogel hybrids would be a new class of open porous material and are expected to further extend the practical applications of this class of porous compounds.
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Affiliation(s)
- Hajar Maleki
- Chemistry and Physics of Materials , Paris-Lodron University Salzburg , Jakob-Haringer-Strasse 2a , 5020 , Salzburg , Austria .
| | - Lawrence Whitmore
- Chemistry and Physics of Materials , Paris-Lodron University Salzburg , Jakob-Haringer-Strasse 2a , 5020 , Salzburg , Austria .
| | - Nicola Hüsing
- Chemistry and Physics of Materials , Paris-Lodron University Salzburg , Jakob-Haringer-Strasse 2a , 5020 , Salzburg , Austria .
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88
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Affiliation(s)
- Satoru Takeshita
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Satoshi Yoda
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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89
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Zu G, Kanamori K, Maeno A, Kaji H, Nakanishi K. Superflexible Multifunctional Polyvinylpolydimethylsiloxane‐Based Aerogels as Efficient Absorbents, Thermal Superinsulators, and Strain Sensors. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804559] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Guoqing Zu
- Department of Chemistry Graduate School of Science Kyoto University, Kitashirakawa Sakyo-ku Kyoto 606-8502 Japan
| | - Kazuyoshi Kanamori
- Department of Chemistry Graduate School of Science Kyoto University, Kitashirakawa Sakyo-ku Kyoto 606-8502 Japan
| | - Ayaka Maeno
- Institute for Chemical Research Kyoto University Gokasho, Uji Kyoto 611-0011 Japan
| | - Hironori Kaji
- Institute for Chemical Research Kyoto University Gokasho, Uji Kyoto 611-0011 Japan
| | - Kazuki Nakanishi
- Department of Chemistry Graduate School of Science Kyoto University, Kitashirakawa Sakyo-ku Kyoto 606-8502 Japan
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90
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Zu G, Kanamori K, Maeno A, Kaji H, Nakanishi K. Superflexible Multifunctional Polyvinylpolydimethylsiloxane-Based Aerogels as Efficient Absorbents, Thermal Superinsulators, and Strain Sensors. Angew Chem Int Ed Engl 2018; 57:9722-9727. [PMID: 29957853 DOI: 10.1002/anie.201804559] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Indexed: 11/05/2022]
Abstract
Aerogels are porous materials but show poor mechanical properties and limited functionality, which significantly restrict their practical applications. Preparation of highly bendable and processable aerogels with multifunctionality remains a challenge. Herein we report unprecedented superflexible aerogels based on polyvinylpolydimethylsiloxane (PVPDMS) networks, PVPDMS/polyvinylpolymethylsiloxane (PVPMS) copolymer networks, and PVPDMS/PVPMS/graphene nanocomposites by a facile radical polymerization/hydrolytic polycondensation strategy and ambient pressure drying or freeze drying. The aerogels have a doubly cross-linked organic-inorganic network structure consisting of flexible polydimethylsiloxanes and hydrocarbon chains with tunable cross-linking density, tunable pore size and bulk density. They have a high hydrophobicity and superflexibility and combine selective absorption, efficient separation of oil and water, thermal superinsulation, and strain sensing.
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Affiliation(s)
- Guoqing Zu
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Kazuyoshi Kanamori
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Ayaka Maeno
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Hironori Kaji
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Kazuki Nakanishi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo-ku, Kyoto, 606-8502, Japan
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91
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Li T, Du A, Zhang T, Ding W, Liu M, Shen J, Zhang Z, Zhou B. Efficient preparation of crack-free, low-density and transparent polymethylsilsesquioxane aerogels via ambient pressure drying and surface modification. RSC Adv 2018; 8:17967-17975. [PMID: 35542068 PMCID: PMC9080537 DOI: 10.1039/c8ra03061h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 05/01/2018] [Indexed: 11/21/2022] Open
Abstract
Polymethylsilsesquioxane (PMSQ) aerogels have gained considerable attention due to their high transparency, good mechanical properties and low thermal conductivity. However, low-density PMSQ aerogels are difficult to obtain by ambient pressure drying due to irreversible shrinkage. Inspired by previous research, we speculate that reducing surface silanol groups could reduce irreversible shrinkage along with the skeleton-strengthening effect. In addition, extending the ageing process is expected to lead to increased density. Thus, in this paper, we applied a mature technique to modify the surfaces of PMSQ gels with terminal silane groups to reduce hydrophilic surface silanol groups without strengthening the skeletons. This surface modification process greatly reduced irreversible shrinkage and allowed the PMSQ gels to return to their original sizes, in accompany with the decrease of silanol group (NMR results as the direct evidence). This method exhibits extremely high efficiency in the preparation of crack-free, low-density and transparent PMSQ aerogels. The PMSQ aerogels dried at ambient pressure had a low density of 48 mg cm-3, low thermal conductivity (21.1 mW m-1 K-1), high transparency (81.3% at 550 nm), super-hydrophobicity (contact angle of 155°) and excellent mechanical properties. The proposed method will be useful for the industrial production of transparent insulating materials and has potential applications in space exploration.
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Affiliation(s)
- Tiemin Li
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
| | - Ai Du
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
| | - Ting Zhang
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
| | - Wenhui Ding
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
| | - Mingfang Liu
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
| | - Jun Shen
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
| | - Zhihua Zhang
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
| | - Bin Zhou
- Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering of Tongji University No. 1239 Siping Road, Yangpu District Shanghai 200092 PR China
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