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Kittle JD, Grasdal EN, Kim SM, Levin NR, Davis PA, Kittle AL, Kittle IJ, Mulcahy JA, Keith BR. Vapor Sorption-Desorption Phenomena of HD and GB Simulants from Polyurethane Thin Films on Aluminum Oxide via a Quartz Crystal Microbalance. ACS OMEGA 2022; 7:22735-22742. [PMID: 35811928 PMCID: PMC9260914 DOI: 10.1021/acsomega.2c02257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 06/13/2022] [Indexed: 06/15/2023]
Abstract
Protection and decontamination of surfaces after exposure to chemical warfare agents (CWAs) are of considerable interest to the homeland defense and battlespace operation communities. In this work, polyurethane was spin-coated onto aluminum oxide quartz crystal microbalance (QCM) sensors. Polyurethane film thickness was varied by altering the concentration of the polymer/chloroform solution used for spin-coating. Atomic force microscopy confirmed the formation of smooth, homogeneous films on the QCM sensor surface. Aluminum oxide QCM sensors coated with polyurethane were exposed to saturated vapors of dichloropentane (DCP), a mustard gas (HD) simulant, and dimethyl methylphosphonate (DMMP), a sarin gas (GB) simulant, and the mass uptake, diffusion coefficient, volume fraction, and partition coefficient of the simulant in the film were determined from QCM data. Results showed that both DCP and DMMP readily sorbed into the films although the mass uptake of DCP was greater than that of DMMP owing to DCP's higher vapor pressure. Additionally, the CWA simulant uptake increased with polyurethane film thickness. Sorption diffusion coefficients were 1 × 10-13 cm2/s and 1 × 10-12 cm2/s for DCP and DMMP vapor, respectively. Simulant desorption was also measured and showed that some DMMP remained in the film/substrate system, while DCP sorption was fully reversible. Reversible desorption for both CWA simulants was relatively quick and independent over the range of film thicknesses studied, with average desorption diffusion coefficients of 2 × 10-9 cm2/s and 1 × 10-11 cm2/s for DCP and DMMP, respectively. Collectively, this study is expected to inform protection and decontamination strategies of equipment and structures upon exposure to CWAs.
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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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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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5
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Isolated and aggregated carvacrol guest molecules in cocrystalline poly(2,6-dimethyl-1,4-phenylene)oxide films. Polym J 2021. [DOI: 10.1038/s41428-021-00511-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Golla M, Nagendra B, Rizzo P, Daniel C, Ruiz de Ballesteros O, Guerra G. Polymorphism of Poly(2,6-dimethyl-1,4-phenylene)oxide in Axially Stretched Films. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02691] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Manohar Golla
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Baku Nagendra
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Paola Rizzo
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Christophe Daniel
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
| | - Odda Ruiz de Ballesteros
- University of Naples “Federico II”, Department of Chemical Sciences, via Cintia − Complesso Monte Sant’Angelo 21, 80126 Napoli, Italy
| | - Gaetano Guerra
- University of Salerno, Department of Chemistry and Biology “A. Zambelli”, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
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Nagendra B, Cozzolino A, Daniel C, Rizzo P, Guerra G, Auriemma F, De Rosa C, D’Alterio MC, Tarallo O, Nuzzo A. Two Nanoporous Crystalline Forms of Poly(2,6-dimethyl-1,4-phenylene)oxide and Related Co-Crystalline Forms. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01911] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Baku Nagendra
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università degli Studi di Salerno, Via Ponte don Melillo, 84084 Fisciano, Italy
| | - Antonietta Cozzolino
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università degli Studi di Salerno, Via Ponte don Melillo, 84084 Fisciano, Italy
| | - Christophe Daniel
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università degli Studi di Salerno, Via Ponte don Melillo, 84084 Fisciano, Italy
| | - Paola Rizzo
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università degli Studi di Salerno, Via Ponte don Melillo, 84084 Fisciano, Italy
| | - Gaetano Guerra
- Dipartimento di Chimica e Biologia and INSTM Research Unit, Università degli Studi di Salerno, Via Ponte don Melillo, 84084 Fisciano, Italy
| | - Finizia Auriemma
- Dipartimento di Scienze chimiche—Università di Napoli “Federico II”, via Cintia—Complesso Monte Sant’Angelo 21, 80126 Napoli, Italy
| | - Claudio De Rosa
- Dipartimento di Scienze chimiche—Università di Napoli “Federico II”, via Cintia—Complesso Monte Sant’Angelo 21, 80126 Napoli, Italy
| | - Massimo Christian D’Alterio
- Dipartimento di Scienze chimiche—Università di Napoli “Federico II”, via Cintia—Complesso Monte Sant’Angelo 21, 80126 Napoli, Italy
| | - Oreste Tarallo
- Dipartimento di Scienze chimiche—Università di Napoli “Federico II”, via Cintia—Complesso Monte Sant’Angelo 21, 80126 Napoli, Italy
| | - Anna Nuzzo
- SAES Getters S.p.A., Viale Italia 77, 20020 Lainate, Milan, Italy
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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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11
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Humidity properties of Schiff base polymers. OPEN CHEM 2018. [DOI: 10.1515/chem-2018-0106] [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] Open
Abstract
AbstractThe synthesized Schiff base polymers were investigated for humidity and chloroform response characteristics. The crystal structure of polymers were analyzed using X-ray diffraction (X-RD) method. We used the QCM (quartz crystal microbalance) method for the analyses of the water steam adsorption and desorption ratio of polymers. The experimental results showed that Schiff base polymers were very sensitive to humidity and chloroform at room temperature and it was possible to use it as a sensing element in moisture sensor applications.
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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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Acikbas Y, Erdogan M, Capan R, Yukruk F. Optical Characterization of an N,N′-Dicyclohexyl-3,4:9,10-Perylene bis(Dicarboximide) Langmuir–Blodgett Film for the Determination of Volatile Organic Compounds. ANAL LETT 2016. [DOI: 10.1080/00032719.2015.1122028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Acikbas Y, Cankaya N, Capan R, Erdogan M, Soykan C. Swelling behavior of the 2-(4-methoxyphenylamino)-2-oxoethyl methacrylate monomer LB thin film exposed to various organic vapors by quartz crystal microbalance technique. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2016. [DOI: 10.1080/10601325.2016.1110453] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Perevedentsev A, Stavrinou PN, Bradley DDC, Smith P. Solution-Crystallization and Related Phenomena in 9,9-Dialkyl-Fluorene Polymers. I. Crystalline Polymer-Solvent Compound Formation for Poly(9,9-dioctylfluorene). ACTA ACUST UNITED AC 2015; 53:1481-1491. [PMID: 26435576 PMCID: PMC4584509 DOI: 10.1002/polb.23798] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 07/14/2015] [Indexed: 11/29/2022]
Abstract
Polymer-solvent compound formation, occurring via co-crystallization of polymer chains and selected small-molecular species, is demonstrated for the conjugated polymer poly(9,9-dioctylfluorene) (PFO) and a range of organic solvents. The resulting crystallization and gelation processes in PFO solutions are studied by differential scanning calorimetry, with X-ray diffraction providing additional information on the resulting microstructure. It is shown that PFO-solvent compounds comprise an ultra-regular molecular-level arrangement of the semiconducting polymer host and small-molecular solvent guest. Crystals form following adoption of the planar-zigzag β-phase chain conformation, which, due to its geometry, creates periodic cavities that accommodate the ordered inclusion of solvent molecules of matching volume. The findings are formalized in terms of nonequilibrium temperature–composition phase diagrams. The potential applications of these compounds and the new functionalities that they might enable are also discussed. © 2015 The Authors. Journal of Polymer Science Part B: Polymer Physics published by Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 1481–1491
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Affiliation(s)
- Aleksandr Perevedentsev
- Department of Physics and Centre for Plastic Electronics, Imperial College London London, SW7 2AZ, United Kingdom
| | - Paul N Stavrinou
- Department of Physics and Centre for Plastic Electronics, Imperial College London London, SW7 2AZ, United Kingdom
| | - Donal D C Bradley
- Department of Physics and Centre for Plastic Electronics, Imperial College London London, SW7 2AZ, United Kingdom
| | - Paul Smith
- Department of Materials, Eidgenössische Technische Hochschule (ETH) Zürich Vladimir-Prelog-Weg 5, 8093, Zürich, Switzerland
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Lu Y, Chang Y, Tang N, Qu H, Liu J, Pang W, Zhang H, Zhang D, Duan X. Detection of Volatile Organic Compounds Using Microfabricated Resonator Array Functionalized with Supramolecular Monolayers. ACS APPLIED MATERIALS & INTERFACES 2015; 7:17893-17903. [PMID: 26226622 DOI: 10.1021/acsami.5b04385] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper describes the detection of volatile organic compounds (VOCs) using an e-nose type integrated microfabricated sensor array, in which each resonator is coated with different supramolecular monolayers: p-tert-butyl calix[8]arene (Calix[8]arene), 2,3,7,8,12,13,17,18-octaethyl-21H,23H-porphine (Porphyrin), β-cyclodextrin (β-CD), and cucurbit[8]uril (CB[8]). Supramolecular monolayers fabricated by Langmuir-Blodgett techniques work as specific sensing interface for different VOCs recognition which increase the sensor selectivity. Microfabricated ultrahigh working frequency film bulk acoustic resonator (FBAR) transducers (4.4 GHz) enable their high sensitivity toward monolayer gas sensing which facilitate the analyses of VOCs adsorption isotherms and kinetics. Two affinity constants (K1, K2) are obtained for each VOC, which indicate the gas molecule adsorption happen inside and outside of the supramolecular cavities. Additional kinetic information on adsorption and desorption rate constants (ka, kd) are obtained as well from exponential fitting results. The five parameters, one from the conventional frequency shift signals of mass transducers and the other four from the indirect analyses of monolayer adsorption behaviors, thus enrich the sensing matrix (Δf, K1, K2, ka, kd) which can be used as multiparameter fingerprint patterns for highly selective detection and discrimination of VOCs.
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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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18
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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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Albunia AR, Rizzo P, Ianniello G, Rufolo C, Guerra G. Syndiotactic polystyrene films with a cocrystalline phase including carvacrol guest molecules. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/polb.23464] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
| | - Paola Rizzo
- Dipartimento di Chimica e Biologia; INSTM Research Unit; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
| | - Graziella Ianniello
- Dipartimento di Chimica e Biologia; INSTM Research Unit; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
| | - Claudia Rufolo
- Dipartimento di Chimica e Biologia; INSTM Research Unit; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
| | - Gaetano Guerra
- Dipartimento di Chimica e Biologia; INSTM Research Unit; Università di Salerno; Via Giovanni Paolo II 132 84084 Fisciano (SA) Italy
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Bhattacharya S, Sharma DK, Saurabh S, De S, Sain A, Nandi A, Chowdhury A. Plasticization of poly(vinylpyrrolidone) thin films under ambient humidity: insight from single-molecule tracer diffusion dynamics. J Phys Chem B 2013; 117:7771-82. [PMID: 23777572 DOI: 10.1021/jp401704e] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Studies on diffusion dynamics of single molecules (SMs) have been useful in revealing inhomogeneity of polymer thin films near and above the glass-transition temperature (T(g)). However, despite several applications of polymer thin films where exposure to solvent (or vapor) is common, the effect of absorbed solvent molecules on local morphology and rigidity of polymer matrices is yet to be explored in detail. High-T(g) hydrophilic polymers such as poly(vinylpyrrolidone) (PVP) are used as pharmaceutical coatings for drug release in aqueous medium, as they readily absorb moisture, which results in effective lowering of the T(g) and thereby leads to plasticization. The effect of moisture absorption on swelling and softening of PVP thin films was investigated by visualizing the diffusion dynamics of rhodamine 6G (Rh6G) tracer molecules at various ambient relative humidities (RH). Wide-field epifluorescence microscopy, in conjunction with high-resolution SM tracking, was used to monitor the spatiotemporal evolution of individual tracers under varied moisture contents of the matrix. In the absence of atmospheric moisture, Rh6G molecules in dry PVP films are translationally inactive, suggestive of rigid local environments. Under low moisture contents (RH 30-50%), translational mobility remains arrested but rotational motion is augmented, indicating slight swelling of the polymer network which marks the onset of plasticization. The translational mobility of Rh6G was found to be triggered only at a threshold ambient RH, beyond which a large proportion of tracers exhibit extensive diffusion dynamics. Interestingly, SM tracking data at higher moisture contents of the film (RH ≥ 60%) reveal that the distributions of dynamic parameters (such as diffusivity) are remarkably broad, spanning several orders of magnitude. Furthermore, Rh6G molecules display a wide variety of translational motion even at a fixed ambient RH, clearly pointing out the extremely inhomogeneous environment of plasticized PVP network. Intriguingly, it is observed that a majority of tracers undergo anomalous subdiffusion even under high moisture contents of the matrix. Analyses of SM trajectories using velocity autocorrelation function reveal that subdiffusive behaviors of Rh6G are likely to originate from fractional Brownian motion, a signature of tracer dynamics in viscoelastic medium.
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Affiliation(s)
- Sukanya Bhattacharya
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Daniel C, Longo S, Ricciardi R, Reverchon E, Guerra G. Monolithic Nanoporous Crystalline Aerogels. Macromol Rapid Commun 2013; 34:1194-207. [DOI: 10.1002/marc.201300260] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 03/28/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Christophe Daniel
- Department of Chemistry and Biology and INSTM Research Units; Università degli Studi di Salerno, via Ponte Don Melillo; 84084 Fisciano SA Italy
| | - Simona Longo
- Department of Chemistry and Biology and INSTM Research Units; Università degli Studi di Salerno, via Ponte Don Melillo; 84084 Fisciano SA Italy
| | - Rosa Ricciardi
- Department of Chemistry and Biology and INSTM Research Units; Università degli Studi di Salerno, via Ponte Don Melillo; 84084 Fisciano SA Italy
| | - Ernesto Reverchon
- Department of Industrial Engineering; Università degli Studi di Salerno; via Ponte Don Melillo 84084 Fisciano SA Italy
| | - Gaetano Guerra
- Department of Chemistry and Biology and INSTM Research Units; Università degli Studi di Salerno, via Ponte Don Melillo; 84084 Fisciano SA Italy
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Guo Y, Tang D, Du Y, Liu B. Controlled fabrication of hexagonally close-packed Langmuir-Blodgett silica particulate monolayers from binary surfactant and solvent systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2849-2858. [PMID: 23387554 DOI: 10.1021/la3049218] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We describe a controllable method to fabricate hexagonally close-packed Langmuir-Blodgett (LB) monolayers with stearic acid (SA) as co-surfactant and methanol as co-solvent. The optimal SA concentrations and volume ratios of chloroform to methanol are 0.8 mg/mL and 3:1 for particles of 140 nm, 0.50 mg/mL and 4:1 for particles of 300 nm, and 0.05 mg/mL and 5:1 for particles of 550 nm, respectively. Additionally, SEM detections of the monolayers transferred at different surface pressures indicate that the monolayers deposited from the binary systems are more compressible. The experimental results indicate that the interparticle repulsions and particle-water interactions can be enhanced without decreasing the particle hydrophobicity by adding SA and methanol; thus, particulate monolayers with large hexagonally close-packed domains composed of small silica particles can be successfully fabricated using LB technique. We propose that the enhanced interparticle repulsion is attributed to the Columbic repulsion resulting from the attachment of SA molecules to the CTAB modified particles around the three phase contact line.
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Affiliation(s)
- Yudi Guo
- Department of Chemistry, School of Science, Harbin Institute of Technology, Harbin 150001, China
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Albunia AR, Rizzo P, Guerra G. Control of guest transport in polymer films by structure and orientation of nanoporous-crystalline phases. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.01.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Daniel C, Zhovner D, Guerra G. Thermal Stability of Nanoporous Crystalline and Amorphous Phases of Poly(2,6-dimethyl-1,4-phenylene) Oxide. Macromolecules 2013. [DOI: 10.1021/ma302227q] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Christophe Daniel
- Dipartimento di Chimica e Biologia e Unità INSTM, Università degli Studi di Salerno, via Ponte
Don Melillo, 84084 Fisciano (SA), Italy
| | - Daria Zhovner
- Dipartimento di Chimica e Biologia e Unità INSTM, Università degli Studi di Salerno, via Ponte
Don Melillo, 84084 Fisciano (SA), Italy
| | - Gaetano Guerra
- Dipartimento di Chimica e Biologia e Unità INSTM, Università degli Studi di Salerno, via Ponte
Don Melillo, 84084 Fisciano (SA), Italy
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Wang M, Janout V, Regen SL. Minimizing defects in polymer-based Langmuir-Blodgett monolayers and bilayers via gluing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:4614-4617. [PMID: 22364564 DOI: 10.1021/la204985d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Polymeric surfactants were prepared by quaternization of poly(4-chloromethylstyrene) with N,N-dimethyl-N-n-dodecylamine and N,N-dimethyl-N-n-octylamine to give 1 and 2, respectively. Each of these polymers formed stable monolayers at the air/water interface. Injection of poly(acrylic acid) (PAA) beneath the surface of these films led to a substantial increase in their cohesiveness (i.e., "gluing"), as evidenced by a dramatic increase in their surface viscosity. Examination of monolayers of 1 by atomic force microscopy, after being transferred to silicon wafers that were surface-modified with n-octadecyltrichlorosilane, showed that the presence of PAA leads to intact film. In contrast, transfer of unglued monolayers resulted in poor coverage. Comparison of the barrier properties of single glued and unglued LB bilayers formed in the presence and in the absence of PAA have shown that PAA minimizes defect formation within these ultrathin assemblies.
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Affiliation(s)
- Minghui Wang
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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Daniel C, Longo S, Cardea S, Vitillo JG, Guerra G. Monolithic nanoporous–crystalline aerogels based on PPO. RSC Adv 2012. [DOI: 10.1039/c2ra22325b] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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