1
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Polymorphism of poly(2,6-dimethyl-1,4-phenylene) oxide (PPO): Co-crystalline and nanoporous-crystalline phases. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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2
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Mancuso A, Vaiano V, Antico P, Sacco O, Venditto V. Photoreactive polymer composite for selective oxidation of benzene to phenol. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.09.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Nagendra B, Daniel C, Rizzo P, Guerra G. c
‐perpendicular orientation in thin
nanoporous‐crystalline
poly(2,6‐dimethyl‐1,4‐phenylene)oxide films. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5690] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Baku Nagendra
- Dipartimento di Chimica e Biologia, INSTM Research Unit Università degli Studi di Salerno Fisciano Italy
| | - Christophe Daniel
- Dipartimento di Chimica e Biologia, INSTM Research Unit Università degli Studi di Salerno Fisciano Italy
| | - Paola Rizzo
- Dipartimento di Chimica e Biologia, INSTM Research Unit Università degli Studi di Salerno Fisciano Italy
| | - Gaetano Guerra
- Dipartimento di Chimica e Biologia, INSTM Research Unit Università degli Studi di Salerno Fisciano Italy
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4
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Nagendra B, Cozzolino A, Daniel C, Rizzo P, Guerra G. High Surface Area Nanoporous-Crystalline Polymer Films. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00271] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Baku Nagendra
- Department of Chemistry and Biology, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
| | - Antonietta Cozzolino
- Department of Chemistry and Biology, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
| | - Christophe Daniel
- Department of Chemistry and Biology, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
| | - Paola Rizzo
- Department of Chemistry and Biology, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
| | - Gaetano Guerra
- Department of Chemistry and Biology, INSTM Research Unit, Università di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano (SA), Italy
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5
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Polydopamine-Coated Poly-Lactic Acid Aerogels as Scaffolds for Tissue Engineering Applications. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27072137. [PMID: 35408538 PMCID: PMC9000627 DOI: 10.3390/molecules27072137] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/17/2022] [Accepted: 03/23/2022] [Indexed: 11/17/2022]
Abstract
Poly-L-lactic acid (PLLA) aerogel-based scaffolds were obtained from physical PLLA gels containing cyclopentanone (CPO) or methyl benzoate (BzOMe) molecules. An innovative single step method of solvent extraction, using supercritical CO2, was used to achieve cylindrical monolithic aerogels. The pore distribution and size, analyzed by SEM microscopy, were found to be related to the crystalline forms present in the physical nodes that hold the gels together, the stable α’-form and the metastable co-crystalline ε-form, detected in the PLLA/BzOMe and PLLA/CPO aerogels, respectively. A higher mechanical compressive strength was found for the PLLA/CPO aerogels, which exhibit a more homogenous porosity. In vitro biocompatibility tests also indicated that monolithic PLLA/CPO aerogels exhibited greater cell viability than PLLA/BzOMe aerogels. An improved biocompatibility of PLLA/CPO monolithic aerogels was finally observed by coating the surface of the aerogels with polydopamine (PDA) obtained by the in situ polymerization of dopamine (DA). The synergistic effect of biodegradable polyester (PLLA) and the biomimetic interface (PDA) makes this new 3D porous scaffold, with porosity and mechanical properties that are tunable based on the solvent used in the preparation process, attractive for tissue engineering applications.
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6
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Cozzolino A, Nagendra B, Rizzo P, Daniel C, Guerra G. Fast uptake of organic pollutants from dilute aqueous solutions by nanoporous-crystalline PPO films with c-perpendicular orientation. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2021.110976] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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7
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Golla M, Cozzolino A, Nagendra B, Vignola E, Daniel C, Rizzo P, Guerra G, Auriemma F, D’Alterio MC. Molecular Features Behind Formation of α or β Co-Crystalline and Nanoporous-Crystalline Phases of PPO. Front Chem 2022; 9:809850. [PMID: 35145955 PMCID: PMC8821151 DOI: 10.3389/fchem.2021.809850] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 12/30/2021] [Indexed: 12/02/2022] Open
Abstract
Guest molecular features determining the formation of α and β phases of poly(2-6-dimethyl-1,4-phenylene) oxide (PPO) are explored by collecting literature data and adding many new film preparations, both by solution casting and by guest sorption in amorphous films. Independently of the considered preparation method, the α-form is favored by the hydrophobic and bulky guest molecules, while the hydrophilic and small guest molecules favor the β-form. Furthermore, molecular modeling studies indicate that the β-form inducer guests establish stronger dispersive interactions with the PPO units than the α-form inducer guests. Thus, the achievement of co-crystalline (and derived nanoporous crystalline) α- and β-forms would result from differences in energy gain due to the host–guest interactions established at the local scale.
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Affiliation(s)
- Manohar Golla
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
| | - Antonietta Cozzolino
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
| | - Baku Nagendra
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
| | - Emanuele Vignola
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
| | - Christophe Daniel
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
| | - Paola Rizzo
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
| | - Gaetano Guerra
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
- *Correspondence: Gaetano Guerra,
| | - Finizia Auriemma
- Dipartimento di Scienze Chimiche, Università di Napoli “Federico II”, Napoli, Italy
| | - Massimo Christian D’Alterio
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università Degli Studi di Salerno, Fisciano, Italy
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8
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Cozzolino A, Nagendra B, Rizzo P, Daniel C, Guerra G. Fast uptake of organic pollutants from dilute aqueous solutions by nanoporous-crystalline PPO films with c-perpendicular orientation. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110864] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Absorption and Isomerization of Azobenzene Guest Molecules in Polymeric Nanoporous Crystalline Phases. CHEMISTRY 2021. [DOI: 10.3390/chemistry3030078] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
PPO co-crystalline (CC) films including azobenzene guest molecules have been prepared and characterized by WAXD, FTIR and UV-Visible measurements. Isomerization reactions of azobenzene (photo-induced trans to cis and spontaneous cis to trans) included in α and β nanoporous-crystalline (NC) phases leading to CC phases, or simply absorbed in amorphous phase have been studied on thick and thin films. Spectroscopic analysis shows that photo-isomerization of azobenzene occurs without expulsion of azobenzene guest molecules from crystalline phases. Sorption studies of α and β NC films immersed into photo-isomerized azobenzene solution reveal a higher selectivity of the β NC phase toward cis azobenzene isomer than the α NC phase, inducing us to propose the β NC phase as particularly suitable for absorbing spherically bulky guest molecules.
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10
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Melting of nanoporous-crystalline and co-crystalline solution cast films of poly(2,6-dimethyl-1,4-phenylene) oxide. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123935] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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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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Heater BS, Yang Z, Lee MM, Chan MK. In Vivo Enzyme Entrapment in a Protein Crystal. J Am Chem Soc 2020; 142:9879-9883. [DOI: 10.1021/jacs.9b13462] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bradley S. Heater
- School of Life Sciences & Center of Novel Biomaterials, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - Zaofeng Yang
- School of Life Sciences & Center of Novel Biomaterials, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - Marianne M. Lee
- School of Life Sciences & Center of Novel Biomaterials, The Chinese University of Hong Kong, Hong Kong, SAR, China
| | - Michael K. Chan
- School of Life Sciences & Center of Novel Biomaterials, The Chinese University of Hong Kong, Hong Kong, SAR, China
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14
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Musto P, Loianno V, Scherillo G, La Manna P, Galizia M, Guerra G, Mensitieri G. Benzene-Induced Crystallization of PPO: A Combined Thermodynamic and Vibrational Spectroscopy Study. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b04563] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pellegrino Musto
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei 34, Pozzuoli (Na), Italy
| | - Valerio Loianno
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
| | - Giuseppe Scherillo
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
| | - Pietro La Manna
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei 34, Pozzuoli (Na), Italy
| | - Michele Galizia
- School of Chemical, Biological and Materials Engineering, University of Oklahoma, 100 E. Boyd Street, Norman, Oklahoma 73019, United States
| | - Gaetano Guerra
- Department of Chemistry and Biology, University of Salerno, Via Giovanni Paolo II 132, Fisciano Salerno 84084, Italy
| | - Giuseppe Mensitieri
- Institute for Polymers, Composites and Biomaterials, National Research Council of Italy, via Campi Flegrei 34, Pozzuoli (Na), Italy
- Department of Chemical, Materials and Production Engineering, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy
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15
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Khedaioui D, Boisson C, D'Agosto F, Montarnal D. Polyethylene Aerogels with Combined Physical and Chemical Crosslinking: Improved Mechanical Resilience and Shape-Memory Properties. Angew Chem Int Ed Engl 2019; 58:15883-15889. [PMID: 31498536 DOI: 10.1002/anie.201908257] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 08/30/2019] [Indexed: 11/11/2022]
Abstract
While the introduction of polymers into aerogels strongly enhances their toughness, truly elastic monolithic aerogels which restore their dimensions upon extensive compression are still challenging to synthesize. In this context hydrophobic semi-crystalline polymers with low glass transition temperatures, and combined stiffness and flexibility, have only recently attracted attention. Shown here is that polyethylene aerogels with a low density, and combined chemical crosslinking and high crystallinity, display high moduli and excellent mechanical resilience. To maximize the crystallinity of these aerogels while maintaining a high crosslinking density, polyethylene networks with well-defined segments were synthesized by hydrosilylation crosslinking of telechelic, vinyl-functionalized oligomers obtained from catalyzed chain-growth polymerization. Recoverable deformations both above and below the melting temperature of polyethylene affords remarkable shape-memory properties.
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Affiliation(s)
- Douriya Khedaioui
- Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616, Villeurbanne, France
| | - Christophe Boisson
- Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616, Villeurbanne, France
| | - Franck D'Agosto
- Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616, Villeurbanne, France
| | - Damien Montarnal
- Univ Lyon. Université Claude Bernard Lyon 1, CPE Lyon, CNRS, UMR 5265, Chemistry, Catalysis, Polymers and Processes, 43 Bvd du 11 Novembre 1918, 69616, Villeurbanne, France
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16
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Khedaioui D, Boisson C, D'Agosto F, Montarnal D. Polyethylene Aerogels with Combined Physical and Chemical Crosslinking: Improved Mechanical Resilience and Shape‐Memory Properties. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908257] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Douriya Khedaioui
- Univ Lyon. Université Claude Bernard Lyon 1 CPE Lyon CNRS, UMR 5265 Chemistry, Catalysis, Polymers and Processes 43 Bvd du 11 Novembre 1918 69616 Villeurbanne France
| | - Christophe Boisson
- Univ Lyon. Université Claude Bernard Lyon 1 CPE Lyon CNRS, UMR 5265 Chemistry, Catalysis, Polymers and Processes 43 Bvd du 11 Novembre 1918 69616 Villeurbanne France
| | - Franck D'Agosto
- Univ Lyon. Université Claude Bernard Lyon 1 CPE Lyon CNRS, UMR 5265 Chemistry, Catalysis, Polymers and Processes 43 Bvd du 11 Novembre 1918 69616 Villeurbanne France
| | - Damien Montarnal
- Univ Lyon. Université Claude Bernard Lyon 1 CPE Lyon CNRS, UMR 5265 Chemistry, Catalysis, Polymers and Processes 43 Bvd du 11 Novembre 1918 69616 Villeurbanne France
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17
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18
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Daniel C, Antico P, Guerra G. Etched Fibers of Syndiotactic Polystyrene with Nanoporous-Crystalline Phases. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01044] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Christophe Daniel
- Department of Chemistry and Biology and INSTM Research Unit, Università degli Studi di Salerno, via Giovanni Paolo II, 84084 Fisciano (SA), Italy
| | - Pasqualmorica Antico
- Department of Chemistry and Biology and INSTM Research Unit, Università degli Studi di Salerno, via Giovanni Paolo II, 84084 Fisciano (SA), Italy
| | - Gaetano Guerra
- Department of Chemistry and Biology and INSTM Research Unit, Università degli Studi di Salerno, via Giovanni Paolo II, 84084 Fisciano (SA), Italy
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19
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Samitsu S. Thermally Stable Mesoporous Poly(ether sulfone) Monoliths with Nanofiber Network Structures. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b02217] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sadaki Samitsu
- Research Center for Structural
Materials, National Institute for Materials Science (NIMS), 1-2-1,
Sengen, Tsukuba, Ibaraki, Japan 305-0047
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20
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21
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Saeed AM, Rewatkar PM, Majedi Far H, Taghvaee T, Donthula S, Mandal C, Sotiriou-Leventis C, Leventis N. Selective CO 2 Sequestration with Monolithic Bimodal Micro/Macroporous Carbon Aerogels Derived from Stepwise Pyrolytic Decomposition of Polyamide-Polyimide-Polyurea Random Copolymers. ACS APPLIED MATERIALS & INTERFACES 2017; 9:13520-13536. [PMID: 28379692 DOI: 10.1021/acsami.7b01910] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Polymeric aerogels (PA-xx) were synthesized via room-temperature reaction of an aromatic triisocyanate (tris(4-isocyanatophenyl) methane) with pyromellitic acid. Using solid-state CPMAS 13C and 15N NMR, it was found that the skeletal framework of PA-xx was a statistical copolymer of polyamide, polyurea, polyimide, and of the primary condensation product of the two reactants, a carbamic-anhydride adduct. Stepwise pyrolytic decomposition of those components yielded carbon aerogels with both open and closed microporosity. The open micropore surface area increased from <15 m2 g-1 in PA-xx to 340 m2 g-1 in the carbons. Next, reactive etching at 1,000 °C with CO2 opened access to the closed pores and the micropore area increased by almost 4× to 1150 m2 g-1 (out of 1750 m2 g-1 of a total BET surface area). At 0 °C, etched carbon aerogels demonstrated a good balance of adsorption capacity for CO2 (up to 4.9 mmol g-1), and selectivity toward other gases (via Henry's law). The selectivity for CO2 versus H2 (up to 928:1) is suitable for precombustion fuel purification. Relevant to postcombustion CO2 capture and sequestration (CCS), the selectivity for CO2 versus N2 was in the 17:1 to 31:1 range. In addition to typical factors involved in gas sorption (kinetic diameters, quadrupole moments and polarizabilities of the adsorbates), it is also suggested that CO2 is preferentially engaged by surface pyridinic and pyridonic N on carbon (identified with XPS) in an energy-neutral surface reaction. Relatively high uptake of CH4 (2.16 mmol g-1 at 0 °C/1 bar) was attributed to its low polarizability, and that finding paves the way for further studies on adsorption of higher (i.e., more polarizable) hydrocarbons. Overall, high CO2 selectivities, in combination with attractive CO2 adsorption capacities, low monomer cost, and the innate physicochemical stability of carbon render the materials of this study reasonable candidates for further practical consideration.
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Affiliation(s)
- Adnan M Saeed
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
| | - Parwani M Rewatkar
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
| | - Hojat Majedi Far
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
| | - Tahereh Taghvaee
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
| | - Suraj Donthula
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
| | - Chandana Mandal
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
| | - Chariklia Sotiriou-Leventis
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
| | - Nicholas Leventis
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
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22
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Daniel C, Pellegrino M, Venditto V, Aurucci S, Guerra G. Nanoporous-crystalline poly(2,6-dimethyl-1,4-phenylene)oxide (PPO) aerogels. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.10.017] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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23
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Alshrah M, Tran MP, Gong P, Naguib HE, Park CB. Development of high-porosity resorcinol formaldehyde aerogels with enhanced mechanical properties through improved particle necking under CO 2 supercritical conditions. J Colloid Interface Sci 2016; 485:65-74. [PMID: 27649092 DOI: 10.1016/j.jcis.2016.09.030] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 09/02/2016] [Accepted: 09/13/2016] [Indexed: 10/21/2022]
Abstract
A new high porosity resorcinol-formaldehyde (RF) aerogel with improved particle necking is presented in this work. This RF aerogel was developed under CO2 supercritical drying conditions without any structural shrinkage. The water content and the catalyst percentage were varied to modify the particles' nucleation and growth mechanisms and to control particle-particle connections. The nucleation mechanism solely dependent on the initial catalyst percentage; the number of nuclei increased with the catalyst percentage. However, the growth and connection of the particles dependent on both the water content and the catalyst percentage through their effect on the pH value. As the water content increased to have a larger void fraction, the pH value decreased. Consequently, the spherical growth of the particles became dominant and, thereby, the connection of the particles became more difficult. But as the catalyst percentage increased, the pH value increased, and the connection of the particles became facilitated with the formation of necks around the particles. As a result, the semi-fibril-like structure was developed with a high void fraction. A 30% increase in the structural elasticity and a very low thermal conductivity of 0.0249W/mK were obtained.
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Affiliation(s)
- Mohammed Alshrah
- Microcellular Plastic Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Minh-Phuong Tran
- Microcellular Plastic Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Pengjian Gong
- Microcellular Plastic Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Hani E Naguib
- Smart and Adaptive Polymers & Composites Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada
| | - Chul B Park
- Microcellular Plastic 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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Mulyadi A, Zhang Z, Deng Y. Fluorine-Free Oil Absorbents Made from Cellulose Nanofibril Aerogels. ACS APPLIED MATERIALS & INTERFACES 2016; 8:2732-2740. [PMID: 26761377 DOI: 10.1021/acsami.5b10985] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Aerogels based on cellulose nanofibrils (CNFs) have been of great interest as absorbents due to their high absorption capacity, low density, biodegradability, and large surface area. Hydrophobic aerogels have been designed to give excellent oil absorption tendency from water. Herein, we present an in situ method for CNF surface modification and hydrophobic aerogel preparation. Neither solvent exchange nor fluorine chemical is used in aerogel preparations. The as-prepared hydrophobic aerogels exhibit low density (23.2 mg/cm(-3)), high porosity (98.5%), good flexibility, and solvent-induced shape recovery property. Successful surface modification was confirmed through field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and water contact angle measurements. The hydrophobic aerogels show high absorption capacities for various oils, depending on liquid density, up to 47× their original weight but with low water uptake (<0.5 g/g aerogel).
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Affiliation(s)
- Arie Mulyadi
- School of Chemical & Biomolecular Engineering, Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Zhe Zhang
- School of Chemical & Biomolecular Engineering, Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Yulin Deng
- School of Chemical & Biomolecular Engineering, Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
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Jamart-Grégoire B, Son S, Allix F, Felix V, Barth D, Jannot Y, Pickaert G, Degiovanni A. Monolithic organic aerogels derived from single amino-acid based supramolecular gels: physical and thermal properties. RSC Adv 2016. [DOI: 10.1039/c6ra20803g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Supercritical CO2 drying of a low molecular weight organogel lead to the first aerogel in a monolithic form bearing superinsulation properties.
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Affiliation(s)
| | - Sébastien Son
- Laboratoire de Chimie Physique Macromoléculaire
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Florent Allix
- Laboratoire de Chimie Physique Macromoléculaire
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Vincent Felix
- Laboratoire d'Energétique et de Mécanique Théorique et Appliquée
- Lorraine University
- CNRS
- 54504 Vandoeuvre-lès-Nancy
- France
| | - Danielle Barth
- Laboratoire Réactions et Génie des Procédés
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Yves Jannot
- Laboratoire d'Energétique et de Mécanique Théorique et Appliquée
- Lorraine University
- CNRS
- 54504 Vandoeuvre-lès-Nancy
- France
| | - Guillaume Pickaert
- Laboratoire de Chimie Physique Macromoléculaire
- Lorraine University
- CNRS
- 54001 Nancy
- France
| | - Alain Degiovanni
- Laboratoire d'Energétique et de Mécanique Théorique et Appliquée
- Lorraine University
- CNRS
- 54504 Vandoeuvre-lès-Nancy
- France
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Rapid synthesis of sodium silicate based hydrophobic silica aerogel granules with large surface area. ADV POWDER TECHNOL 2015. [DOI: 10.1016/j.apt.2015.01.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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D’Aniello C, Daniel C, Guerra G. ε Form Gels and Aerogels of Syndiotactic Polystyrene. Macromolecules 2015. [DOI: 10.1021/ma502500n] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Concetta D’Aniello
- Department
of Chemistry and
Biology and INSTM Research Unit, Università degli Studi di Salerno, Via Giovanni Paolo II, 84084 Fisciano (SA), Italy
| | - Christophe Daniel
- Department
of Chemistry and
Biology and INSTM Research Unit, Università degli Studi di Salerno, Via Giovanni Paolo II, 84084 Fisciano (SA), Italy
| | - Gaetano Guerra
- Department
of Chemistry and
Biology and INSTM Research Unit, Università degli Studi di Salerno, Via Giovanni Paolo II, 84084 Fisciano (SA), Italy
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Venditto V, Pellegrino M, Califano R, Guerra G, Daniel C, Ambrosio L, Borriello A. Monolithic polymeric aerogels with VOCs sorbent nanoporous crystalline and water sorbent amorphous phases. ACS APPLIED MATERIALS & INTERFACES 2015; 7:1318-1326. [PMID: 25531275 DOI: 10.1021/am507116e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Monolithic syndiotactic polystyrene (s-PS) aerogels, formed by highly crystalline nanofibrils with a hydrophobic nanoporous-crystalline phase and a hydrophilic amorphous phase have been prepared and characterized. These aerogels, with a high degree of sulfonation of the amorphous phase and nearly negligible sulfonation of the crystalline phase, are obtained by treating physical gels exhibiting δ-clathrate form. With respect to unsulfonated nanoporous-crystalline polymeric aerogels, these new selectively sulfonated aerogels present the great advantage of a high water diffusivity and water uptake up to 600 wt %. This water uptake increases greatly the sorption kinetics of organic pollutants by the hydrophobic nanopores of the crystalline phase. For instance, for aerogels with a sulfonation of 10%, the diffusivity of a volatile organic compound (1,2-dichloroethane, DCE) from 10 ppm aqueous solution is more than 3 orders of magnitude higher than that for the unsulfonated aerogel and is very close to the DCE diffusivity in water.
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Affiliation(s)
- Vincenzo Venditto
- Department of Chemistry and Biology, Nanomates Center and INSTM Research Unit, University of Salerno , via Giovanni Paolo II, 84084 Fisciano, SA, Italy
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Longo S, Mauro M, Daniel C, Galimberti M, Guerra G. Clay exfoliation and polymer/clay aerogels by supercritical carbon dioxide. Front Chem 2013; 1:28. [PMID: 24790956 PMCID: PMC3982576 DOI: 10.3389/fchem.2013.00028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Accepted: 10/14/2013] [Indexed: 11/13/2022] Open
Abstract
Supercritical carbon dioxide (scCO2) treatments of a montmorillonite (MMT) intercalated with ammonium cations bearing two long hydrocarbon tails (organo-modified MMT, OMMT) led to OMMT exfoliation, with loss of the long-range order in the packing of the hydrocarbon tails and maintenance of the long-range order in the clay layers. The intercalated and the derived exfoliated OMMT have been deeply characterized, mainly by X-ray diffraction analyses. Monolithic composite aerogels, with large amounts of both intercalated and exfoliated OMMT and including the nanoporous-crystalline δ form of syndiotactic polystyrene (s-PS), have been prepared, by scCO2 extractions of s-PS-based gels. Also for high OMMT content, the gel and aerogel preparation procedures occur without re-aggregation of the exfoliated clay, which is instead observed for other kinds of polymer processing. Aerogels with the exfoliated OMMT have more even dispersion of the clay layers, higher elastic modulus and larger surface area than aerogels with the intercalated OMMT. Extremely light materials with relevant transport properties could be prepared. Moreover, s-PS-based aerogels with exfoliated OMMT could be helpful for the handling of exfoliated clay minerals.
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Affiliation(s)
- Simona Longo
- Department of Chemistry and Biology and INSTM Research Units, Università degli Studi di SalernoFisciano, Italy
| | - Marco Mauro
- Department of Chemistry and Biology and INSTM Research Units, Università degli Studi di SalernoFisciano, Italy
| | - Christophe Daniel
- Department of Chemistry and Biology and INSTM Research Units, Università degli Studi di SalernoFisciano, Italy
| | - Maurizio Galimberti
- Department of Chemistry, Materials and Chemical Engineering, Politecnico di MilanoMilano, Italy
- CNR, Istituto per lo Studio delle Macromolecole, National Research CouncilMilano, Italy
| | - Gaetano Guerra
- Department of Chemistry and Biology and INSTM Research Units, Università degli Studi di SalernoFisciano, Italy
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Longo S, Vitillo JG, Daniel C, Guerra G. Monolithic aerogels based on poly(2,6-diphenyl-1,4-phenylene oxide) and syndiotactic polystyrene. ACS APPLIED MATERIALS & INTERFACES 2013; 5:5493-5499. [PMID: 23701278 DOI: 10.1021/am400592z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Molecular sorption behavior of amorphous and semicrystalline samples based on poly(2,6-diphenyl-1,4-phenylene oxide) (PPPO) has been compared. Fully amorphous PPPO powders, as obtained by supercritical carbon dioxide (scCO2) extraction of concentrated solutions, present uptake of pollutants much higher than for commercial sorbent materials based on semicrystalline PPPO (Tenax TA). Robust monolithic aerogels with good handling characteristics can be easily obtained by solvent extraction by scCO2 from gels including PPPO blends with syndiotactic polystyrene (s-PS). These monolithic PPPO/s-PS aerogels present many advantages as sorbent materials with respect to both amorphous and semicrystalline PPPO powders. In fact, besides the obvious advantages in terms of easier and safer handling, the new monolithic aerogels present higher surface areas and equilibrium guest uptakes.
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Affiliation(s)
- Simona Longo
- Dipartimento di Chimica e Biologia, INSTM Research Unit, Università degli Studi di Salerno, via Ponte Don Melillo, 84084 Fisciano (SA), Italy
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