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Fu W, Xu W, Yin K, Meng X, Wen Y, Peng L, Tang M, Sun L, Sun Y, Dai Y. Flexible-in-rigid polycrystalline titanium nanofibers: a toughening strategy from a macro-scale to a molecular-scale. MATERIALS HORIZONS 2023; 10:65-74. [PMID: 36477767 DOI: 10.1039/d2mh01255c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
TiO2 nanomaterials, especially one-dimensional TiO2 nanofibers fabricated by electrospinning, have received considerable attention in the past two decades, for a variety of basic applications. However, their safe use and easy recycling are still hampered by the inherently subpar mechanical performance. Here, we toughened polycrystalline TiO2 nanofibers by introducing Al3+-species at the very beginning of electrospinning. The resultant long-and-continuous TiO2 nanofibers achieved a Young's modulus of 653.8 MPa, which is ca. 25-fold higher than that of conventional TiO2 nanofibers. Within each nanofiber, amorphous Al2O3-based oxide effectively hindered the coalescence of TiO2 nanocrystals and potentially repaired the surface groves. The solid-state 17O-NMR spectra further revealed the toughening strategy on a molecular scale, where relatively flexible Ti-O-Al bonds replaced rigid O-Ti-O bonds at the interfaces of TiO2 and Al2O3. Moreover, the modified TiO2 nanofibers exhibited superb sinter-resistance, without cracking over 900 °C, which was dynamically monitored by TEM. Therefore, flexible-in-rigid TiO2 fibrous mats can be facilely folded into 3D sponges through origami art. As a potential showcase, the TiO2 sponges were demonstrated as a duarable and renewable filtrator with a high filtration efficiency of 99.97% toward PM2.5 and 99.99% toward PM10 after working for 300 min. This work provides a rational strategy to produce flexible oxide nanofibers and gives an in-depth understanding of the toughening mechanism from the macro-scale to the molecular-scale.
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Affiliation(s)
- Wanlin Fu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China.
| | - Wanlin Xu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China.
| | - Kuibo Yin
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China
| | - Xiangyu Meng
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China.
| | - Yujie Wen
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Luming Peng
- Key Laboratory of Mesoscopic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Mingyu Tang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China.
| | - Litao Sun
- SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, School of Electronic Science and Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China
| | - Yueming Sun
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China.
| | - Yunqian Dai
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China.
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2
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Joo P, Agrawal A, Yao Y, Teo N, Jana SC. Functional aerogel coatings on tetrakaidecahedron lattice. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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3
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Duan Z, Bian H, Zhu L, Xia D. Efficient removal of thiophenic sulfides from fuel by micro-mesoporous 2-hydroxypropyl-β-cyclodextrin polymers through synergistic effect. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121884] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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4
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Farrell E, Jana SC. Surfactant-free oil-in-oil emulsion-templating of polyimide aerogel foams. INT POLYM PROC 2022. [DOI: 10.1515/ipp-2022-4248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A surfactant-free oil-in-oil emulsion-templating method is presented for fabrication of monolithic polyimide aerogel foams using monomer systems that produce fast sol–gel transition. An aerogel foam is a high porosity (∼90%) material with coexisting meso- and macropores inherent to aerogels with externally introduced micrometer size open cells (macrovoids) that are reminiscent of foams. The macrovoids are introduced in polyimide sol using surfactant-free emulsion-templating of droplets of an immiscible liquid that are stabilized against coalescence by fast sol–gel transition. Three immiscible liquids – cyclohexane, n-heptane, and silicone oil – are considered in this work for surfactant-free emulsion-templating. The aerogel foam monoliths, recovered by supercritical drying, exhibit smaller size macrovoids when n-heptane and cyclohexane are used as emulsion-templating liquid, while the overall porosity and the bulk density show weak dependence on the emulsion-templating liquid.
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Affiliation(s)
- Erin Farrell
- School of Polymer Science and Polymer Engineering, University of Akron , Akron , OH 44325-0301 , USA
| | - Sadhan C. Jana
- School of Polymer Science and Polymer Engineering, University of Akron , Akron , OH 44325-0301 , USA
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Wang Z, Yin F, Zhang XF, Zheng T, Yao J. Delignified wood filter functionalized with metal-organic frameworks for high-efficiency air filtration. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121095] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Fashandi M, Karamikamkar S, Leung SN, Naguib HE, Hong J, Liang B, Park CB. Synthesis, structures and properties of hydrophobic Alkyltrimethoxysilane-Polyvinyltrimethoxysilane hybrid aerogels with different alkyl chain lengths. J Colloid Interface Sci 2021; 608:720-734. [PMID: 34628328 DOI: 10.1016/j.jcis.2021.09.128] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/18/2021] [Accepted: 09/21/2021] [Indexed: 02/06/2023]
Abstract
HYPOTHESIS Alkyltrimethoxysilane (ATMS) is among most widely used silane coupling agents. These commercially available, reasonably priced chemicals are often utilized to improve the compatibility of inorganic surfaces with organic coatings. With three hydrolysable moieties, ATMS is an outstanding candidate for solving the hydrophilicity, moisture sensitivity and high cost of silica aerogels. However, ATMS has a non-hydrolysable alkyl chain that undergoes cyclization reactions. The alkyl chain prevents ATMS from being incorporated in aerogel structures. Polyvinyltrimethoxysilane (PVTMS) is a silica precursor that offers two types of crosslinking to the final aerogel product. This strong doubly-crosslinked network can potentially suppress the cyclization reactions of ATMS and include it in aerogel structure. EXPERIMENTS PVTMS was used with ATMS having different alkyl lengths (3-16 carbons) and loadings (25 or 50 wt%) as the silica precursors. Acid and base catalysts were used to perform hydrolysis and condensation reactions on the mixture and ATMS:PVTMS aerogels were obtained via supercritical drying. FINDINGS The incorporation of ATMS in the aerogels was approved by different characterization methods. Results showed that ATMS:PVTMS aerogels possess hydrophobicity (θ ∼ 130°), moisture resistance, varying surface area (44-916 m2·g-1), meso/microporous structure and thermal insulation properties (λ ∼ 0.03 W·m-1K-1). These samples also showed excellent performance in oil and organic solvent adsorption.
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Affiliation(s)
- Maryam Fashandi
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Solmaz Karamikamkar
- Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Siu N Leung
- Lassonde School of Engineering, Department of Mechanical Engineering, York University, Toronto, ON M3J 1P3, Canada
| | - Hani E Naguib
- Smart Polymers & Composites Lab, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada
| | - Jiang Hong
- Project Services and External Development Department, Jiangsu JITRI Advanced Polymer Materials Research Institute Co., Ltd. 21F, Tengfei Building A, 88 Jiangmiao Road, Jiangbei New Area, Nanjing, Jiangsu 211800, China
| | - Bingqing Liang
- Project Services and External Development Department, Jiangsu JITRI Advanced Polymer Materials Research Institute Co., Ltd. 21F, Tengfei Building A, 88 Jiangmiao Road, Jiangbei New Area, Nanjing, Jiangsu 211800, China
| | - 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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Qiao S, Kang S, Zhu J, Wang Y, Yu J, Hu Z. Facile strategy to prepare polyimide nanofiber assembled aerogel for effective airborne particles filtration. JOURNAL OF HAZARDOUS MATERIALS 2021; 415:125739. [PMID: 34088199 DOI: 10.1016/j.jhazmat.2021.125739] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/18/2021] [Accepted: 03/22/2021] [Indexed: 06/12/2023]
Abstract
Polyimide nanofiber (PINF) aerogel materials have received extensive attention as heat insulation, sensors and filtration media due to their excellent thermodynamic properties and unique porous structure. However, PINF must be difficult to disperse in organic solvents (dioxane or dimethyl sulfoxide) and dimensional instability has been regarded as issues that limits the preparation of PINF aerogels, especially in the water. So, it is of great significance to prepare polyimide aerogels with stable structure using water as a dispersant. In this work, the electrospun polyimide nanofiber precursor (polyamic acid (PAA) nanofiber (PAANF)) is uniformly dispersed in water, and triethylamine is added to terminated PAA oligomer as a binder. The resultant PINF aerogel has excellent mechanical properties with outstanding elasticity and a maximum compressive stress of 7.03 kpa at 50% strain. Furthermore, due to the extremely high porosity (98.4%) and hierarchical porous structure, the aerogel exhibits a high filtration efficiency (99.83%) for PM2.5, while the pressure drop is lower than that of the corresponding nanofiber membrane materials, which will facilitate its application in high temperature filtration and other fields.
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Affiliation(s)
- Shiya Qiao
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
| | - Shuai Kang
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
| | - Jing Zhu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China.
| | - Yan Wang
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China.
| | - Junrong Yu
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China.
| | - Zuming Hu
- College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China.
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8
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Investigation of Microstructures and Air Permeability of Aerogel-Coated Textile Fabric Materials. INT POLYM PROC 2021. [DOI: 10.1515/ipp-2020-4095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Abstract
This study focuses on fabrication of aerogel-coated macroporous polyester fabrics for the purposes of filtration of nanometric airborne particles and potential application in facemasks. Syndiotactic polystyrene (sPS) and polyimide (PI) gels that provide respectively majority macropores (diameter > 50 nm) and mesopores (diameter 2 to 50 nm) are coated onto woven polyester fabrics via a dip coating process. The resultant materials are supercritically dried to obtain aerogelcoated fabrics. The results show that sPS is more suitable for the dip coating process. However, evaporation of the solvent during handling of gel-coated fabrics leads to closure of the surface pores that are later recovered via solvent annealing. The resultant aerogel-coated fabrics offer high air permeability (∼10–10 m2) and high filtration efficiency (> 99.95%) of airborne sodium chloride test particles of size 25 to 150 nm.
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10
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Jin C, Kulkarni A, Teo N, Jana SC. Fabrication of Pill-Shaped Polyimide Aerogel Particles Using Microfluidic Flows. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c05424] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chenxi Jin
- School of Polymer Science and Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, Ohio 44325-0301, United States
| | - Akshata Kulkarni
- School of Polymer Science and Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, Ohio 44325-0301, United States
| | - Nicholas Teo
- School of Polymer Science and Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, Ohio 44325-0301, United States
| | - Sadhan C. Jana
- School of Polymer Science and Polymer Engineering, The University of Akron, 250 South Forge Street, Akron, Ohio 44325-0301, United States
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12
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Daniel C, Nagendra B, Acocella MR, Cascone E, Guerra G. Nanoporous Crystalline Composite Aerogels with Reduced Graphene Oxide. Molecules 2020; 25:molecules25225241. [PMID: 33182782 PMCID: PMC7696584 DOI: 10.3390/molecules25225241] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 11/06/2020] [Accepted: 11/06/2020] [Indexed: 12/31/2022] Open
Abstract
High-porosity monolithic composite aerogels of syndiotactic polystyrene (sPS) and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) containing reduced graphene oxide (r-GO) were prepared and characterized. The composite aerogels obtained by supercritical carbon dioxide (scCO2) extraction of sPS/r-GO and PPO/r-GO gels were characterized by a fibrillar morphology, which ensured good handling properties. The polymer nanoporous crystalline phases obtained within the aerogels led to high surface areas with values up to 440 m2 g−1. The role of r-GO in aerogels was studied in terms of catalytic activity by exploring the oxidation capacity of composite PPO and sPS aerogels toward benzyl alcohol in diluted aqueous solutions. The results showed that, unlike sPS/r-GO aerogels, PPO/r-GO aerogels were capable of absorbing benzyl alcohol from the diluted solutions, and that oxidation of c.a. 50% of the sorbed benzyl alcohol molecules into benzoic acid occurred.
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13
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Mosanenzadeh SG, Karamikamkar S, Saadatnia Z, Park CB, Naguib HE. PPDA-PMDA polyimide aerogels with tailored nanostructure assembly for air filtering applications. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117279] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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14
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Yang J, Su H, Lian C, Shang Y, Liu H, Wu J. Understanding surface charge regulation in silica nanopores. Phys Chem Chem Phys 2020; 22:15373-15380. [PMID: 32597911 DOI: 10.1039/d0cp02152k] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Nanoporous silica is used in a wide variety of applications, ranging from bioanalytical tools and materials for energy storage and conversion as well as separation devices. The surface charge density of nanopores is not easily measured by experiment yet plays a vital role in the performance and functioning of silica nanopores. Herein, we report a theoretical model to describe charge regulation in silica nanopores by combining the surface-reaction model and the classical density functional theory (CDFT). The theoretical predictions provide quantitative insights into the effects of pH, electrolyte concentration, and pore size on the surface charge density and electric double layer structure. With a fixed pore size, the surface charge density increases with both pH and the bulk salt concentration similar to that for an open surface. At fixed pH and salt concentration, the surface charge density rises with the pore size until it reaches the bulk asymptotic value when the surface interactions become negligible. At high pH, the surface charge density is mainly determined by the ratio of the Debye screening length to the pore size (λD/D).
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Affiliation(s)
- Jie Yang
- State Key Laboratory of Chemical Engineering, Shanghai Engineering Research Center of Hierarchical Nanomaterials, and School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
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Xing Y, Cui Y, Li Z, Liu Y, Bao D, Su W, Tsai CJ, Tseng CH, Shiue A, Pui DYH, Yang RT. Getting insight into the influence of coexisting airborne nanoparticles on gas adsorption performance over porous materials. JOURNAL OF HAZARDOUS MATERIALS 2020; 386:121928. [PMID: 31884354 DOI: 10.1016/j.jhazmat.2019.121928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 12/17/2019] [Accepted: 12/17/2019] [Indexed: 06/10/2023]
Abstract
Adsorption as one of the most important air cleaning methods has been extensively applied during which the coexisting airborne nanoparticles (NPs) with sizes close to adsorbent pore sizes could inevitably influence gas adsorption processes. In this work, the influence of sub-20 nm NPs on toluene adsorption on ZSM-5 zeolites exchanged with different cations (Li+, Na+ and K+) were studied based on gas-and-particle coexisting adsorption/filtration tests. Affinities for both toluene and NPs on adsorbents follow Li-ZSM-5 > Na-ZSM-5 > K-ZSM-5 regarding the orders of charge density, pore size, and internal and external specific surface areas. The toluene adsorption was shown to be impaired by coexisting NPs from perspectives of thermodynamics and kinetics. For Li-ZSM-5, Na-ZSM-5 and K-ZSM-5, significant relative reductions of 10.4 %, 10.5 % and 16.0 % in toluene adsorption capacity at the lower feed concentration, and of 20.3 %, 15.2 % and 2.3 % in mass transfer coefficient at the higher feed concentration were observed, respectively. The influential mechanisms regarding competitiveness between toluene and NPs in interaction with cationic and porous surfaces were accordingly proposed, which are of practical significance for selecting robust adsorbents under realistic harsh air conditions.
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Affiliation(s)
- Yi Xing
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Yongkang Cui
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Ziyi Li
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Yingshu Liu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
| | - Danqi Bao
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Wei Su
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Chuen-Jinn Tsai
- Institute of Environmental Engineering, National Chiao Tung University, University Road, Hsinchu 30010, Taiwan
| | - Chao-Heng Tseng
- Institute of Environment Engineering and Management, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Angus Shiue
- Institute of Environment Engineering and Management, National Taipei University of Technology, Taipei 10608, Taiwan
| | - David Y H Pui
- Particle Technology Laboratory, Mechanical Engineering, University of Minnesota, 111 Church St., S.E., Minneapolis 55455, USA; School of Science and Engineering, Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China
| | - Ralph T Yang
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109-2136, USA
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Mosanenzadeh SG, Saadatnia Z, Karamikamkar S, Park CB, Naguib HE. Polyimide aerogels with novel bimodal micro and nano porous structure assembly for airborne nano filtering applications. RSC Adv 2020; 10:22909-22920. [PMID: 35520303 PMCID: PMC9054633 DOI: 10.1039/d0ra03907a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 06/02/2020] [Indexed: 11/28/2022] Open
Abstract
Aerogels have presented a very high potential to be utilized as airborne nanoparticles' filtration media due to their nanoscale pore size and extremely high porosity. The filtering performance of aerogels, such as air permeability and filtration efficiency, is highly related to the configuration of aerogels' nanostructure assembly. However, as aerogel morphology is formed with respect to the intermolecular forces during the gelation stage, tailoring the aerogel nanostructure assembly is still a challenge. In this work, a novel strategy for tailoring polyimide aerogel nanostructure assembly is proposed by controlled disturbing of the intermolecular forces. From the results, the nanostructure assembly of the 4,4′-oxydianiline (ODA)–biphenyl-tetracarboxylic acid dianhydride (BPDA) polyimide aerogel is tailored to a uniform bimodal micro and nano porous structure. This was achieved by introducing the proper fraction of thermoplastic polyurethane (TPU) chains to the polyimide chains in the solution state and through a controlled process. The fabricated polyimide/TPU aerogels with bimodal morphology presented enhanced filtration performance, with 30% improved air permeability and reduced cell size of 3.51 nm over the conventional ODA–BPDA polyimide aerogels. Moreover, the fabricated bimodal aerogels present the reduced shrinkage, density, and effective thermal conductivity of 6.3% and 0.063 g cm−3, 28.7 mW m−1 K−1, respectively. Furthermore, the bimodal polyimide/TPU aerogels show the higher porosity of 96.5 vol% along with increased mechanical flexibility over the conventional polyimide aerogel with comparable backbone chemistry. Aerogels have presented a very high potential to be utilized as airborne nanoparticles' filtration media due to their nanoscale pore size and extremely high porosity.![]()
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Affiliation(s)
| | - Zia Saadatnia
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
| | - Solmaz Karamikamkar
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
| | - Chul B. Park
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
| | - Hani E. Naguib
- Department of Mechanical and Industrial Engineering
- University of Toronto
- Toronto
- Canada
- Department of Materials Science and Engineering
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17
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Rizzo P, Cozzolino A, Guerra G. Chemical Stabilization of Hexanal Molecules by Inclusion as Guests of Nanoporous-Crystalline Syndiotactic Polystyrene Crystals. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02168] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paola Rizzo
- Dipartimento di Chimica e Biologia, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II, 84084 Fisciano (SA), Italy
| | - Antonietta Cozzolino
- Dipartimento di Chimica e Biologia, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II, 84084 Fisciano (SA), Italy
| | - Gaetano Guerra
- Dipartimento di Chimica e Biologia, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II, 84084 Fisciano (SA), Italy
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18
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Teo N, Jana SC. Surfactant-Free Process for the Fabrication of Polyimide Aerogel Microparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2303-2312. [PMID: 30650304 DOI: 10.1021/acs.langmuir.8b03841] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This work focuses on the fabrication of polyimide aerogel microparticles of diameter 200-1000 μm from a surfactant-free, two-phase, silicone oil/dimethylformamide (DMF) oil-in-oil (O/O) system using a simple microfluidic device. The polyimide sol prepared in DMF is turned into droplets suspended in silicone oil in the microfluidic device. The droplets are guided to a heated silicone oil bath to accelerate sol-gel transition and imidization reactions, thereby yielding spherical, discrete gel microparticles that do not undergo coalescence. The discrete gel microparticles are isolated and supercritically dried to obtain aerogel microparticles. The microparticle size distribution shows dependence on dispersed and continuous phase flowrates in the microfluidic channels. The microparticle surface morphology shows dependence on the silicone oil bath temperature.
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Affiliation(s)
- Nicholas Teo
- Department of Polymer Engineering , The University of Akron , 250 South Forge Street , Akron , Ohio 44325-0301 , United States
| | - Sadhan C Jana
- Department of Polymer Engineering , The University of Akron , 250 South Forge Street , Akron , Ohio 44325-0301 , United States
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19
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Teo N, Jana SC. Solvent Effects on Tuning Pore Structures in Polyimide Aerogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8581-8590. [PMID: 29957959 DOI: 10.1021/acs.langmuir.8b01513] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This work evaluates the effects of solvents and a block copolymer surfactant on pore structures in polyimide aerogels synthesized via sol-gel reaction process. Specifically, cross-linked polyimide gel networks are synthesized in single or mixed solvents from a combination of dimethylformamide, N-methylpyrrolidone, and dimethylacetamide and supercritically dried to obtain aerogels. The bulk density, pore size, and mechanical properties of aerogels are determined. The results show that gel times are strongly dependent on the electron acceptance ability of the solvent system and concentration of the surfactant. At longer gel times, the polyimide strands coarsen and the pores in aerogel shift from predominantly mesoporous to macroporous state with corresponding reduction in compressive modulus. The block copolymer surfactant also slows down gelation and coarsens the polyimide strands but only weakly affects the compressive modulus of the aerogels.
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Affiliation(s)
- Nicholas Teo
- Department of Polymer Engineering , The University of Akron , 250 South Forge Street , Akron , Ohio 44325-0301 , United States
| | - Sadhan C Jana
- Department of Polymer Engineering , The University of Akron , 250 South Forge Street , Akron , Ohio 44325-0301 , United States
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20
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Yi Z, Cheng P, Chen J, Liu K, Liu Q, Li M, Zhong W, Wang W, Lu Z, Wang D. PVA-co-PE Nanofibrous Filter Media with Tailored Three-Dimensional Structure for High Performance and Safe Aerosol Filtration via Suspension-Drying Procedure. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b02523] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Zhibing Yi
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Pan Cheng
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Jiahui Chen
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Ke Liu
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Qiongzhen Liu
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Mufang Li
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Weibing Zhong
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Wenwen Wang
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Zhentan Lu
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
| | - Dong Wang
- Hubei Key Laboratory of Advanced Textile Materials & Application, Hubei International Scientific and Technological Cooperation Base of Intelligent Textile Materials & Application, Wuhan Textile University, Wuhan 430200, China
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
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Chisca S, Musteata VE, Sougrat R, Behzad AR, Nunes SP. Artificial 3D hierarchical and isotropic porous polymeric materials. SCIENCE ADVANCES 2018; 4:eaat0713. [PMID: 29756039 PMCID: PMC5947983 DOI: 10.1126/sciadv.aat0713] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Accepted: 03/26/2018] [Indexed: 05/20/2023]
Abstract
Hierarchical porous materials that replicate complex living structures are attractive for a wide variety of applications, ranging from storage and catalysis to biological and artificial systems. However, the preparation of structures with a high level of complexity and long-range order at the mesoscale and microscale is challenging. We report a simple, nonextractive, and nonreactive method used to prepare three-dimensional porous materials that mimic biological systems such as marine skeletons and honeycombs. This method exploits the concurrent occurrence of the self-assembly of block copolymers in solution and macrophase separation by nucleation and growth. We obtained a long-range order of micrometer-sized compartments. These compartments are interconnected by ordered cylindrical nanochannels. The new approach is demonstrated using polystyrene-b-poly(t-butyl acrylate), which can be further explored for a broad range of applications, such as air purification filters for viruses and pollution particle removal or growth of bioinspired materials for bone regeneration.
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Affiliation(s)
- Stefan Chisca
- Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Valentina-Elena Musteata
- Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
| | - Rachid Sougrat
- Advanced Nanofabrication Imaging and Characterization Laboratory, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Ali Reza Behzad
- Advanced Nanofabrication Imaging and Characterization Laboratory, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
| | - Suzana P. Nunes
- Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
- Corresponding author.
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Zhai C, Jana SC. Tuning Porous Networks in Polyimide Aerogels for Airborne Nanoparticle Filtration. ACS APPLIED MATERIALS & INTERFACES 2017; 9:30074-30082. [PMID: 28806054 DOI: 10.1021/acsami.7b09345] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The suitability of monolithic polyimide aerogels as filter media for removal of airborne nanoparticles was investigated in this work by considering two solvents, N-methylpyrrolidone (NMP) and dimethylformamide (DMF) for tuning of meso- and macropore content. Polyimide gels were synthesized from the chemical reactions between solutions of pyromellitic dianhydride, 2,2'-dimethylbenzidine, and 1, 3, 5-triaminophenoxylbenzene. The gels were dried via supercritical drying in CO2 to obtain the aerogels. The porosity of polyimide aerogels was varied by changing the initial concentration of the solids in the solutions in the range of 2.5-10 wt %. The resulting aerogels show high porosity (91-98%), high specific surface area (473-953 m2/g), low bulk density (0.025-0.12 g/cm3), and solvent dependent macro- and mesopore content. The monoliths with bulk density of >0.05 g/cm3 produced high values of nanoparticle filtration efficiency (>99.95%) with air permeability of the order of 10-10 m2. A strong proportional relationship was observed between the macropore content and air permeability and between the mesopore content and high filtration efficiency. Specimens prepared in DMF and NMP offered the same level of filtration efficiency, but the former provided a factor of 2 higher air permeability due to much greater proportion of macropores.
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Affiliation(s)
- Chunhao Zhai
- Department of Polymer Engineering, University of Akron , Akron, Ohio 44325, United States
| | - Sadhan C Jana
- Department of Polymer Engineering, University of Akron , Akron, Ohio 44325, United States
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25
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Zhang S, Liu H, Zuo F, Yin X, Yu J, Ding B. A Controlled Design of Ripple-Like Polyamide-6 Nanofiber/Nets Membrane for High-Efficiency Air Filter. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1603151. [PMID: 28060451 DOI: 10.1002/smll.201603151] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Indexed: 06/06/2023]
Abstract
The filtration capacity of fibrous media for airborne particles is restricted by their thick diameter, low porosity, and limited frontal area. The ability to solve this problem would have broad technological implications for various air filtration applications; despite many past efforts, it remains a great challenge to achieve. Herein, a facile and scalable strategy to fabricate the ripple-like polyamide-6 nanofiber/nets (PA-6 NF/N) air filter via combining electrospinning/netting technique with receiving substrate design is demonstrated. This proposed approach allows the scaffold filaments to orderly embed into 2D PA-6 nanonets layer with Steiner-tree structures and nanoscale diameter of ≈20 nm, resulting in the ripple-like membrane with extremely small pore size, highly porous structure, and hugely extended frontal surface, by facilely adjusting its pleat span and pleat pitch. These unique structural advantages enable the ripple-like PA-6 NF/N filter to filtrate the ultrafine particles with high removal efficiency of 99.996%, low air resistance of 95 Pa, and robust quality factor of >0.11 Pa-1 ; using its superlight weight of 0.9 g m-2 and physical sieving manner. This approach has the potentialities to give rise to a novel generation of filter media displaying enhanced filtration capacity for various applications thanks to their nanoscale features and designed macrostructures.
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Affiliation(s)
- Shichao Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
- Nanofibers Research Center, Modern Textile Institute, Donghua University, Shanghai, 200051, China
| | - Hui Liu
- Nanofibers Research Center, Modern Textile Institute, Donghua University, Shanghai, 200051, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai, 201620, China
| | - Fenglei Zuo
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai, 201620, China
| | - Xia Yin
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai, 201620, China
| | - Jianyong Yu
- Nanofibers Research Center, Modern Textile Institute, Donghua University, Shanghai, 200051, China
| | - Bin Ding
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China
- Nanofibers Research Center, Modern Textile Institute, Donghua University, Shanghai, 200051, China
- Key Laboratory of Textile Science and Technology, Ministry of Education, College of Textiles, Donghua University, Shanghai, 201620, China
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