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Atomic Layer Deposition onto Thermoplastic Polymeric Nanofibrous Aerogel Templates for Tailored Surface Properties.
ACS Nano. 2020 Jul 14 [Online ahead of print]AN

Abstract

Poly(vinyl alcohol-co-ethylene) (EVOH) nanofibrous aerogel (NFA) templates were fabricated through vacuum freeze-drying from EVOH nanofibrous suspensions. Aluminum oxide (Al2O3) layers were deposited onto highly porous templates to form organic-inorganic hybrid aerogels by the atomic layer deposition (ALD) technique. Chemical and physical measurements showed that mechanical properties were improved through ALD. In addition, the surface chemistry of ALD modified aerogels showed a fascinating cyclic change based on the number of ALD deposition cycles. A transition from hydrophilicity to hydrophobicity was observed after a few cycles of ALD coating; however, additional deposition cycles changed the wettability characteristics back to hydrophilicity. This hydrophilic-hydrophobic-hydrophilic variation is shown to be governed by a combination of geometrical and chemical surface properties. Furthermore, the deposited Al2O3 could substantially improve aerogels strength and reduce permanent deformation after cyclic compression. The Young's modulus of aerogels increased from 5.54 to 33.27 kPa, and the maximum stress at 80% strain went up from 31.13 to 176.11 kPa, after 100 cycles of trimethyl-aluminum (TMA)/water ALD. Thermogravimetric analysis (TGA) results confirm that ALD can effectively improve the heat resistance characteristics of polymeric aerogel. The onset temperature and the residual mass increased with increasing numbers of ALD cycles. During pyrolysis, the nanofiber cores were decomposed, and the brittle pure Al2O3 self-supporting nanotube aerogels with the continuous hollow nanotubular network were formed. A coating of continuous thickness Al2O3 layer on individual nanofiber was achieved after 100 ALD cycles. In additional to mechanical strength and physical property changes, the ALD modified aerogel also shows a superhydrophobic and oleophilic surface chemistry, which could potentially be used to remove oils/organic solvents from water. The resultant aerogels exhibit excellent absorption capacity (31-73 g/g) for various liquids, and the material could be reused after distillation or squeezing. A successful scale-up of such materials could provide some insights into the design and development of thermoplastic polymeric NFAs with substantial industrial applications.

Authors+Show Affiliations

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. The Georgia W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. Renewable Bioproducts Institute, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. Renewable Bioproducts Institute, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.Materials Characterization Facility, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. The Georgia W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States. Renewable Bioproducts Institute, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32644796

Citation

Lu, Jianwei, et al. "Atomic Layer Deposition Onto Thermoplastic Polymeric Nanofibrous Aerogel Templates for Tailored Surface Properties." ACS Nano, 2020.
Lu J, Li Y, Song W, et al. Atomic Layer Deposition onto Thermoplastic Polymeric Nanofibrous Aerogel Templates for Tailored Surface Properties. ACS Nano. 2020.
Lu, J., Li, Y., Song, W., Losego, M. D., Monikandan, R., Jacob, K. I., & Xiao, R. (2020). Atomic Layer Deposition onto Thermoplastic Polymeric Nanofibrous Aerogel Templates for Tailored Surface Properties. ACS Nano. https://doi.org/10.1021/acsnano.9b09497
Lu J, et al. Atomic Layer Deposition Onto Thermoplastic Polymeric Nanofibrous Aerogel Templates for Tailored Surface Properties. ACS Nano. 2020 Jul 14; PubMed PMID: 32644796.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Atomic Layer Deposition onto Thermoplastic Polymeric Nanofibrous Aerogel Templates for Tailored Surface Properties. AU - Lu,Jianwei, AU - Li,Yi, AU - Song,Wei, AU - Losego,Mark D, AU - Monikandan,Rebhadevi, AU - Jacob,Karl I, AU - Xiao,Ru, Y1 - 2020/07/14/ PY - 2020/7/10/pubmed PY - 2020/7/10/medline PY - 2020/7/10/entrez KW - atomic layer deposition KW - deposition cycles KW - hydrophilic−hydrophobic−hydrophilic variation KW - nanofibrous aerogel KW - self-supporting nanotube aerogels JF - ACS nano JO - ACS Nano N2 - Poly(vinyl alcohol-co-ethylene) (EVOH) nanofibrous aerogel (NFA) templates were fabricated through vacuum freeze-drying from EVOH nanofibrous suspensions. Aluminum oxide (Al2O3) layers were deposited onto highly porous templates to form organic-inorganic hybrid aerogels by the atomic layer deposition (ALD) technique. Chemical and physical measurements showed that mechanical properties were improved through ALD. In addition, the surface chemistry of ALD modified aerogels showed a fascinating cyclic change based on the number of ALD deposition cycles. A transition from hydrophilicity to hydrophobicity was observed after a few cycles of ALD coating; however, additional deposition cycles changed the wettability characteristics back to hydrophilicity. This hydrophilic-hydrophobic-hydrophilic variation is shown to be governed by a combination of geometrical and chemical surface properties. Furthermore, the deposited Al2O3 could substantially improve aerogels strength and reduce permanent deformation after cyclic compression. The Young's modulus of aerogels increased from 5.54 to 33.27 kPa, and the maximum stress at 80% strain went up from 31.13 to 176.11 kPa, after 100 cycles of trimethyl-aluminum (TMA)/water ALD. Thermogravimetric analysis (TGA) results confirm that ALD can effectively improve the heat resistance characteristics of polymeric aerogel. The onset temperature and the residual mass increased with increasing numbers of ALD cycles. During pyrolysis, the nanofiber cores were decomposed, and the brittle pure Al2O3 self-supporting nanotube aerogels with the continuous hollow nanotubular network were formed. A coating of continuous thickness Al2O3 layer on individual nanofiber was achieved after 100 ALD cycles. In additional to mechanical strength and physical property changes, the ALD modified aerogel also shows a superhydrophobic and oleophilic surface chemistry, which could potentially be used to remove oils/organic solvents from water. The resultant aerogels exhibit excellent absorption capacity (31-73 g/g) for various liquids, and the material could be reused after distillation or squeezing. A successful scale-up of such materials could provide some insights into the design and development of thermoplastic polymeric NFAs with substantial industrial applications. SN - 1936-086X UR - https://www.unboundmedicine.com/medline/citation/32644796/Atomic_Layer_Deposition_onto_Thermoplastic_Polymeric_Nanofibrous_Aerogel_Templates_for_Tailored_Surface_Properties L2 - https://doi.org/10.1021/acsnano.9b09497 DB - PRIME DP - Unbound Medicine ER -
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