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Dinh VP, Luu TA, Siemek K, Kozlenko DP, Le KH, Dang NT, Nguyen TV, Le Phuc N, Tran TD, Phan PT, Lo ST, Hoang KAT, Dinh TK, Luong NT, Le NC, Nguyen NT, Ho TH, Tran XD, Tran PD, Nguyen HQ. Crystallization Pathways and Evolution of Morphologies and Structural Defects of α-MnO 2 under Air Annealing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15604-15613. [PMID: 36507853 DOI: 10.1021/acs.langmuir.2c02237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Manganese dioxide nanomaterials have wide applications in many areas from catalysis and Li-ion batteries to gas sensing. Understanding the crystallization pathways, morphologies, and formation of defects in their structure is particularly important but still a challenging issue. Herein, we employed an arsenal of X-ray diffraction (XRD), scanning electron microscopy (SEM), neutron diffraction, positron annihilation spectroscopies, and ab initio calculations to investigate the evolution of the morphology and structure of α-MnO2 nanomaterials prepared via reduction of KMnO4 solution with C2H5OH prior to being annealed in air at 200-600 °C. We explored a novel evolution that α-MnO2 nucleation can be formed even at room temperature and gradually developed to α-MnO2 nanorods at above 500 °C. We also found the existence of H+ or K+ ions in the [1 × 1] tunnels of α-MnO2 and observed the simultaneous presence of Mn and O vacancies in α-MnO2 crystals at low temperatures. Increasing the temperature removed these O vacancies, leaving only the Mn vacancies in the samples.
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Affiliation(s)
- Van-Phuc Dinh
- Institute of Fundamental and Applied Sciences, Duy Tan University, 06 Tran Nhat Duat, Ho Chi Minh City700000, Viet Nam
- Faculty of Natural Sciences, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam
| | - Tuyen Anh Luu
- Center for Nuclear Technologies, Vietnam Atomic Energy Institute, Ho Chi Minh City700000, Viet Nam
- Dzhelepov Laboratory of Nuclear Problems, JINR, Dubna141980, Moscow Region, Russia
| | - Krzysztof Siemek
- Dzhelepov Laboratory of Nuclear Problems, JINR, Dubna141980, Moscow Region, Russia
- Institute of Nuclear Physics, Polish Academy of Sciences, KrakowPL-31342, Poland
| | - Denis P Kozlenko
- Frank Laboratory of Neutron Physics, JINR, Dubna141980, Moscow Region, Russia
| | - Khiem Hong Le
- Institute of Physics, Viet Nam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi City100000, Viet Nam
- Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi City100000, Viet Nam
| | - Ngoc Toan Dang
- Faculty of Natural Sciences, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam
- Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam
| | - Tiep Van Nguyen
- Institute of Physics, Viet Nam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Ha Noi City100000, Viet Nam
- Flerov Laboratory of Nuclear Reactions, JINR, Dubna141980, Moscow Region, Russia
| | - Nguyen Le Phuc
- Vietnam Petroleum Institute, Ho Chi Minh City700000, Viet Nam
| | - Tap Duy Tran
- Faculty of Materials Science and Technology, University of Science, VNU-HCMC, 227 Nguyen Van Cu, Ho Chi Minh City700000, Viet Nam
- Vietnam National University Ho Chi Minh City, Ho Chi Minh City700000, Viet Nam
| | - Phuc T Phan
- Center for Nuclear Technologies, Vietnam Atomic Energy Institute, Ho Chi Minh City700000, Viet Nam
| | - Son T Lo
- Center for Nuclear Technologies, Vietnam Atomic Energy Institute, Ho Chi Minh City700000, Viet Nam
| | - Kiet Anh Tuan Hoang
- Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam
- Graduate School of Education, University of Pennsylvania, Philadelphia, Pennsylvania19104, United States
| | - Thanh Khan Dinh
- University of Science and Education, The University of Da Nang, Da Nang City550000, Viet Nam
| | - Ngoc Thuy Luong
- Vietnam Petroleum Institute, Ho Chi Minh City700000, Viet Nam
| | - Ngoc Chung Le
- DaLat University, Dalat University, 01 Phu Dong Thien Vuong, Da Lat City670000, Viet Nam
| | - Ngoc-Tuan Nguyen
- Dalat Nuclear Research Institute, 01 Nguyen Tu Luc, Da Lat City670000, Viet Nam
| | - Thien-Hoang Ho
- Dong Nai University, Le Quy Don Street, Bien Hoa City, Dong Nai810000, Viet Nam
| | - Xuan Dong Tran
- Institute of Fundamental and Applied Sciences, Duy Tan University, 06 Tran Nhat Duat, Ho Chi Minh City700000, Viet Nam
- Faculty of Natural Sciences, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam
| | - Phong D Tran
- University of Science and Technology of Hanoi, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi City100000, Viet Nam
| | - Hung Q Nguyen
- Institute of Fundamental and Applied Sciences, Duy Tan University, 06 Tran Nhat Duat, Ho Chi Minh City700000, Viet Nam
- Faculty of Natural Sciences, Duy Tan University, 03 Quang Trung, Da Nang City550000, Viet Nam
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Shantarovich VP, Bekeshev VG, Kevdina IB, Bermeshev MV, Wozniak AI. Microporosity of Polynorbornenes by Positron Annihilation and Sorption Data. HIGH ENERGY CHEMISTRY 2021. [DOI: 10.1134/s0018143921010112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yampolskii Y, Belov N, Alentiev A. Perfluorinated polymers as materials of membranes for gas and vapor separation. J Memb Sci 2020. [DOI: 10.1016/j.memsci.2019.117779] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Shantarovich VP, Bekeshev VG, Bermeshev MV, Alentiev DA, Gustov VW, Belousova EV, Kevdina IB, Novikov YA. Study of Microporosity of Polymer Glasses Using Techniques of Positron Annihilation and Low-Temperature Sorption of Carbon Dioxide. HIGH ENERGY CHEMISTRY 2019. [DOI: 10.1134/s0018143919040118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Belousova EV, Bekeshev VG, Gustov VW, Davankov VA, Krasil’nikova OK, Kevdina IB, Pastukhov AV, Filimonov MK, Shantarovich VP. Specifics of positron studies of microheterogeneous systems as applied to new polymeric sorbents. HIGH ENERGY CHEMISTRY 2015. [DOI: 10.1134/s0018143915030042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Tiwari RR, Smith ZP, Lin H, Freeman B, Paul D. Gas permeation in thin films of “high free-volume” glassy perfluoropolymers: Part II. CO2 plasticization and sorption. POLYMER 2015. [DOI: 10.1016/j.polymer.2014.12.008] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Ohrt C, Rätzke K, Oshima N, Kobayashi Y, O’Rourke BE, Suzuki R, Uedono A, Faupel F. Free Volume Profiles at Polymer–Solid Interfaces Probed by Focused Slow Positron Beam. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00180] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christian Ohrt
- Institute
for Materials Science, Chair for Multicomponent Materials, Christian-Albrechts University at Kiel, Kaiserstr. 2, D-24143 Kiel, Germany
| | - Klaus Rätzke
- Institute
for Materials Science, Chair for Multicomponent Materials, Christian-Albrechts University at Kiel, Kaiserstr. 2, D-24143 Kiel, Germany
| | - Nagayasu Oshima
- Research
Institute of Instrumentation Frontier (RIIF), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Yoshinori Kobayashi
- Research
Institute of Instrumentation Frontier (RIIF), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Brian E. O’Rourke
- Research
Institute of Instrumentation Frontier (RIIF), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Ryoichi Suzuki
- Research
Institute of Instrumentation Frontier (RIIF), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Akira Uedono
- Division
of Applied Physics, Faculty of Pure and Applied Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Franz Faupel
- Institute
for Materials Science, Chair for Multicomponent Materials, Christian-Albrechts University at Kiel, Kaiserstr. 2, D-24143 Kiel, Germany
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Shantarovich VP, Gustov VW, Belousova EV, Polyakova AV, Bekeshev VG, Kevdina IB. Positronium formation and thermostimulated luminescence: A common nature and combined application to studies of organic systems. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2014. [DOI: 10.1134/s1990793114040095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Hougham GG, Jean YC. Relative Contributions of Polarizability and Free Volume in Reduction of Refractive Index and Dielectric Constant with Fluorine Substitution in Polyimides by Positron Annihilation Spectroscopy. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300430] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Gareth G. Hougham
- IBM Thomas J. Watson Research Center; P. O. Box 218, 1101 Kitchawan Road Yorktown Heights New York 10598 USA
| | - Y. C. Jean
- Department of Chemistry; University of Missouri-Kansas City; Kansas City Missouri 64110 USA
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Pastre JC, Browne DL, O’Brien M, Ley SV. Scaling Up of Continuous Flow Processes with Gases Using a Tube-in-Tube Reactor: Inline Titrations and Fanetizole Synthesis with Ammonia. Org Process Res Dev 2013. [DOI: 10.1021/op400152r] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Julio C. Pastre
- Whiffen
Laboratory, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
- Instituto
de Química, University of Campinas - UNICAMP, CP 6154, 13083-970 Campinas, São Paulo, Brazil
| | - Duncan L. Browne
- Whiffen
Laboratory, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Matthew O’Brien
- School
of Physical and Geographical Sciences, Keele University, Lennard-Jones
Building, Keele, Staffordshire ST5 5BG, U.K
| | - Steven V. Ley
- Whiffen
Laboratory, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
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Matson SM, Rätzke K, Shaikh MQ, Litvinova EG, Shishatskiy SM, Peinemann KV, Khotimskiy VS. Macrochain configuration, stucture of free volume and transport properties of poly(1-trimethylsilyl-1-propyne) and poly(1-trimethylgermyl-1-propyne). POLYMER SCIENCE SERIES A 2012. [DOI: 10.1134/s0965545x1207005x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Han SH, Kwon HJ, Kim KY, Seong JG, Park CH, Kim S, Doherty CM, Thornton AW, Hill AJ, Lozano ÁE, Berchtold KA, Lee YM. Tuning microcavities in thermally rearranged polymer membranes for CO2 capture. Phys Chem Chem Phys 2012; 14:4365-73. [DOI: 10.1039/c2cp23729f] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cranwell PB, O'Brien M, Browne DL, Koos P, Polyzos A, Peña-López M, Ley SV. Flow synthesis using gaseous ammonia in a Teflon AF-2400 tube-in-tube reactor: Paal–Knorr pyrrole formation and gas concentration measurement by inline flow titration. Org Biomol Chem 2012; 10:5774-9. [DOI: 10.1039/c2ob25407g] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Konietzny R, Barth C, Harms S, Raetzke K, Koelsch P, Staudt C. Structural investigations and swelling behavior of 6FDA copolyimide thin films. POLYM INT 2011. [DOI: 10.1002/pi.3123] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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16
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Kuhn S, Hartman RL, Sultana M, Nagy KD, Marre S, Jensen KF. Teflon-coated silicon microreactors: impact on segmented liquid-liquid multiphase flows. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:6519-6527. [PMID: 21510687 DOI: 10.1021/la2004744] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We describe fluoropolymer modification of silicon microreactors for control of wetting properties in chemical synthesis applications and characterize the impact of the coating on liquid-liquid multiphase flows of solvents and water. Annular flow of nitrogen gas and a Teflon AF (DuPont) dispersion enable controlled evaporation of fluoropolymer solvent, which in turn brings about three-dimensional polymer deposition on microchannel walls. Consequently, the wetting behavior is switched from hydrophilic to hydrophobic. Analysis of microreactors reveals that the polymer layer thickness increases down the length of the reactor from ∼1 to ∼13 μm with an average thickness of ∼7 μm. Similarly, we show that microreactor surfaces can be modified with poly(tetrafluoroethylene) (PTFE). These PTFE-coated microreactors are further characterized by measuring residence time distributions in segmented liquid-liquid multiphase flows, which display reduced axial dispersion for the coated microreactors. Applying particle image velocimetry, changes in segment shape and velocity fluctuations are observed resulting in reduced axial dispersion. Furthermore, the segment size distribution is narrowed for the hydrophobic microreactors, enabling further control of residence distributions for synthesis and screening applications.
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Affiliation(s)
- Simon Kuhn
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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17
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Račko D, Capponi S, Alvarez F, Colmenero J. The free volume of poly(vinyl methylether) as computed in a wide temperature range and at length scales up to the nanoregion. J Chem Phys 2011; 134:044512. [PMID: 21280753 DOI: 10.1063/1.3525380] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In the present work, we focus on the free volume evaluations from different points of view, including the aspect of probe sizes, temperature, and cavity threshold. The free volume structure is analyzed on structures of poly(vinyl methylether) prepared by fully atomistic molecular dynamics. At first, the temperature behavior of an overall free volume and a free volume separated into individual cavities is shown. The origin of large free volume cavities is explained. A complex view on the cavity number is provided, while a complicated behavior previously observed is now explained. The number of large cavities remained almost constant with the temperature. Oppositely, the number of small cavities related to the atomic packing changes with temperature in a distinct way for glassy and supercooled regions. The cavity number maxima determine a percolation threshold according to percolation theory. The change in polymer properties with temperature can be related to a percolation of the free volume according to the free volume theory, when proper probe radii ∼0.8 Å are used for its observation. A construction of probabilistic distribution of free volume sizes is suggested. The free volume distributions reported here are bimodal. The bimodal character is explained by two different packings--atomic and segmental--forming a prepeak and a main peak on the distribution. Further attention is dedicated to comparisons of the computed free volume sizes and the ortho-positronium (o-Ps) lifetimes. The prepeak of the free volume distribution is probably unseen by o-Ps because of a cavity threshold limit. The effect of the shape factor on the computed o-Ps lifetimes is tested. The quasicavities obtained by redistributing the free volume maintain the ratio of the main dimensions with temperature. Finally, novel data on the cavity environment are provided, while it is suggested how these can be useful with the recent developments in the positron annihilation methods. The coordination number of large cavities with the polymer segments is around 1, as predicted in the free volume theory. Similarly to the percolation and the cavity number, the coordination number exhibits a change when explored by a suitable probe radius ∼0.8 Å. The insightful visualizations showed properties of interest investigated within the actual work.
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Affiliation(s)
- Dušan Račko
- Donostia International Physics Center, Paseo de Manuel Lardizabal 4, 20018 Donostia-San Sebastián, Spain.
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Harms S, Rätzke K, Zaporojtchenko V, Faupel F, Egger W, Ravelli L. Free volume distribution at the Teflon AF®/silicon interfaces probed by a slow positron beam. POLYMER 2011. [DOI: 10.1016/j.polymer.2010.11.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Harms S, Rätzke K, Faupel F, Schneider GJ, Willner L, Richter D. Free Volume of Interphases in Model Nanocomposites Studied by Positron Annihilation Lifetime Spectroscopy. Macromolecules 2010. [DOI: 10.1021/ma1022692] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stephan Harms
- Institut für Materialwissenschaft, Materialverbunde, Technische Fakultät, Christian-Albrechts Universität zu Kiel, 24143 Kiel, Germany
| | - Klaus Rätzke
- Institut für Materialwissenschaft, Materialverbunde, Technische Fakultät, Christian-Albrechts Universität zu Kiel, 24143 Kiel, Germany
| | - Franz Faupel
- Institut für Materialwissenschaft, Materialverbunde, Technische Fakultät, Christian-Albrechts Universität zu Kiel, 24143 Kiel, Germany
| | - Gerald J. Schneider
- Institut für Festkörperforschung, Neutronenstreuung and Jülich Centre for Neutron Science, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Lutz Willner
- Institut für Festkörperforschung, Neutronenstreuung and Jülich Centre for Neutron Science, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Dieter Richter
- Institut für Festkörperforschung, Neutronenstreuung and Jülich Centre for Neutron Science, Forschungszentrum Jülich, D-52425 Jülich, Germany
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Affiliation(s)
- Yuri Yampolskii
- A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, 29, Leninsky Pr., Moscow, Russia
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Han SH, Misdan N, Kim S, Doherty CM, Hill AJ, Lee YM. Thermally Rearranged (TR) Polybenzoxazole: Effects of Diverse Imidization Routes on Physical Properties and Gas Transport Behaviors. Macromolecules 2010. [DOI: 10.1021/ma101549z] [Citation(s) in RCA: 205] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sang Hoon Han
- School of Chemical Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - Nurasyikin Misdan
- School of Chemical Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - Seungju Kim
- School of Chemical Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea
| | - Cara M. Doherty
- Commonwealth Scientific and Industrial Research Organization (CSIRO), Private Bag 33, Clayton South, Victoria 3169, Australia
| | - Anita J. Hill
- Commonwealth Scientific and Industrial Research Organization (CSIRO), Private Bag 33, Clayton South, Victoria 3169, Australia
| | - Young Moo Lee
- School of Chemical Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea
- WCU Department of Energy Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea
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Rätzke K, Wiegemann M, Shaikh MQ, Harms S, Adelung R, Egger W, Sperr P. Open volume in bioadhesive detected by positron annihilation lifetime spectroscopy. Acta Biomater 2010; 6:2690-4. [PMID: 20045088 DOI: 10.1016/j.actbio.2009.12.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2009] [Revised: 11/08/2009] [Accepted: 12/22/2009] [Indexed: 11/30/2022]
Abstract
Barnacles attach to a wide variety of surfaces underwater and show substrate-specific adhesion mechanisms. Investigating and understanding these mechanisms is a key for developing new technical adhesives. We expected open volume (porosity) at the sub-nanometre scale to occur in barnacle adhesive. With positron annihilation lifetime spectroscopy (PALS) it is possible to detect porosity at the nanometre scale by determining the lifetime of positrons. This method has not been applied to bioadhesives so far. We showed that PALS is a suitable technique for the investigation of the barnacle base and its adhesive with respect to open volume. The results were interpreted using a standard model adapted from polymers. We thereby estimated pore sizes of 0.5 nm.
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Affiliation(s)
- Klaus Rätzke
- University of Kiel, Kiel, Schleswig-Holstein, Germany.
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Emmler T, Heinrich K, Fritsch D, Budd PM, Chaukura N, Ehlers D, Rätzke K, Faupel F. Free Volume Investigation of Polymers of Intrinsic Microporosity (PIMs): PIM-1 and PIM1 Copolymers Incorporating Ethanoanthracene Units. Macromolecules 2010. [DOI: 10.1021/ma1008786] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Thomas Emmler
- GKSS-Forschungszentrum Geesthacht GmbH, Institut für Polymerforschung, Max-Planck-Strasse 1, 21502 Geesthacht, Germany
| | - Kathleen Heinrich
- GKSS-Forschungszentrum Geesthacht GmbH, Institut für Polymerforschung, Max-Planck-Strasse 1, 21502 Geesthacht, Germany
| | - Detlev Fritsch
- GKSS-Forschungszentrum Geesthacht GmbH, Institut für Polymerforschung, Max-Planck-Strasse 1, 21502 Geesthacht, Germany
| | - Peter M. Budd
- Organic Materials Innovation Centre, School of Chemistry, University of Manchester, Manchester M13 9PL, U.K
| | - Nhamo Chaukura
- Organic Materials Innovation Centre, School of Chemistry, University of Manchester, Manchester M13 9PL, U.K
| | - Dennis Ehlers
- Technische Fakultät der Universität Kiel, Institut für Materialwissenschaft, Materialverbunde, Kaiserstrasse 2, 24143 Kiel, Germany
| | - Klaus Rätzke
- Technische Fakultät der Universität Kiel, Institut für Materialwissenschaft, Materialverbunde, Kaiserstrasse 2, 24143 Kiel, Germany
| | - Franz Faupel
- Technische Fakultät der Universität Kiel, Institut für Materialwissenschaft, Materialverbunde, Kaiserstrasse 2, 24143 Kiel, Germany
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Jansen JC, Macchione M, Tocci E, De Lorenzo L, Yampolskii YP, Sanfirova O, Shantarovich VP, Heuchel M, Hofmann D, Drioli E. Comparative Study of Different Probing Techniques for the Analysis of the Free Volume Distribution in Amorphous Glassy Perfluoropolymers. Macromolecules 2009. [DOI: 10.1021/ma901244d] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Johannes C. Jansen
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87030 Rende (CS), Italy
| | - Marialuigia Macchione
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87030 Rende (CS), Italy
- Department of Chemistry, University of Calabria, Via P. Bucci 14/D, 87030 Rende (CS), Italy
| | - Elena Tocci
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87030 Rende (CS), Italy
| | - Luana De Lorenzo
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87030 Rende (CS), Italy
| | - Yuri P. Yampolskii
- A.V. Topchiev Institute of Petrochemical Synthesis, 29 Leninsky Prospect, 119991, Moscow, Russian Federation
| | - Olga Sanfirova
- A.V. Topchiev Institute of Petrochemical Synthesis, 29 Leninsky Prospect, 119991, Moscow, Russian Federation
| | - Victor P. Shantarovich
- N. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygina Str., 117334, Moscow
| | - Matthias Heuchel
- GKSS Research Center, Institute of Chemistry, Kantstrasse 55, D-14513, Teltow, Germany
| | - Dieter Hofmann
- GKSS Research Center, Institute of Chemistry, Kantstrasse 55, D-14513, Teltow, Germany
| | - Enrico Drioli
- Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, 87030 Rende (CS), Italy
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Drusch S, Rätzke K, Shaikh MQ, Serfert Y, Steckel H, Scampicchio M, Voigt I, Schwarz K, Mannino S. Differences in Free Volume Elements of the Carrier Matrix Affect the Stability of Microencapsulated Lipophilic Food Ingredients. FOOD BIOPHYS 2009. [DOI: 10.1007/s11483-008-9100-9] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shantarovich VP. Positron annihilation and free volume studies in polymer glasses. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/polb.21602] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Dlubek G, Shaikh MQ, Rätzke K, Faupel F, Paluch M. Temperature dependence of the free volume from positron lifetime experiments and its relation to structural dynamics: phenylphthalein-dimethylether. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2008; 78:051505. [PMID: 19113134 DOI: 10.1103/physreve.78.051505] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2008] [Revised: 09/19/2008] [Indexed: 05/27/2023]
Abstract
Positron annihilation lifetime spectroscopy (PALS) was used to study the microstructure of the free volume in the temperature range between 103 K and 393 K in phenylphthalein-dimethylether (PDE), a low-molecular-weight glass former. Using the routine LIFETIME9.0, the ortho-positronium (o-Ps) lifetime distribution was analyzed, and from this, the volume distribution gn(vh) of subnanometer-size holes was calculated. From a comparison of PALS and specific volume data, the number density and the volume fraction of holes were estimated. These free-volume data, as a function of temperature, were used to test the validity of the Cohen-Turnbull (CT) free-volume theory. It was found that the structural relaxation from dielectric spectroscopy can be described by the CT theory after introducing a corrected free volume (Vf-DeltaV), where DeltaV=0.014 cm3/g. The extended free-volume theory of Cohen and Grest can be fitted to the dielectric-relaxation and free-volume data, but the parameters of both fits are not consistent. PDE shows some peculiar features. The "knee" in the o -Ps lifetime expansion and crossover in temperature dependence of the frequency of the primary dielectric relaxation process occur at different temperatures. In addition, the change in the Vogel-Fulcher-Tammann parameters at TB/Tg=1.1 has no observable effect on the mean free volume vh (or Vf). The size of the smallest representative freely fluctuating subsystem, VSV estimated from the standard deviation sigmah of gn(vh), decreases from 4.1 nm3 to 2.6 nm3 when the temperature increases from T/Tg=1.0 to 1.15. Correspondingly, the length of dynamic heterogeneity, xi=VVS1/3, decreases from 1.6 nm to 1.4 nm. It is concluded that at T/Tg approximately 1.10=TB/Tg the system transforms from a heterogeneous to a homogeneous (true) liquid.
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Affiliation(s)
- Günter Dlubek
- ITA Institute for Innovative Technologies, Köthen/Halle, Wiesenring 4, 06120 Lieskau, Germany.
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Dlubek G, Pionteck J, Yu Y, Thränert S, Elsayed M, Badawi E, Krause-Rehberg R. The Free Volume and Its Recovery in Pressure-Densified and CO2-Swollen Heterocyclic-Ring-Containing Fluoropolymers. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800189] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Dlubek G, Pionteck J, Rätzke K, Kruse J, Faupel F. Temperature Dependence of the Free Volume in Amorphous Teflon AF1600 and AF2400: A Pressure−Volume−Temperature and Positron Lifetime Study. Macromolecules 2008. [DOI: 10.1021/ma800748a] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Günter Dlubek
- ITA Institute for Innovative Technologies, Köthen/Halle, Wiesenring 4, D-06120 Lieskau (Halle/S.), Germany; Leibniz Institute for Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany; Institute for Materials Research, Chair of Materials Compounds, Faculty of Engineering, Christian-Albrecht-University of Kiel, D-24118 Kiel, Germany
| | - Jürgen Pionteck
- ITA Institute for Innovative Technologies, Köthen/Halle, Wiesenring 4, D-06120 Lieskau (Halle/S.), Germany; Leibniz Institute for Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany; Institute for Materials Research, Chair of Materials Compounds, Faculty of Engineering, Christian-Albrecht-University of Kiel, D-24118 Kiel, Germany
| | - Klaus Rätzke
- ITA Institute for Innovative Technologies, Köthen/Halle, Wiesenring 4, D-06120 Lieskau (Halle/S.), Germany; Leibniz Institute for Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany; Institute for Materials Research, Chair of Materials Compounds, Faculty of Engineering, Christian-Albrecht-University of Kiel, D-24118 Kiel, Germany
| | - Jan Kruse
- ITA Institute for Innovative Technologies, Köthen/Halle, Wiesenring 4, D-06120 Lieskau (Halle/S.), Germany; Leibniz Institute for Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany; Institute for Materials Research, Chair of Materials Compounds, Faculty of Engineering, Christian-Albrecht-University of Kiel, D-24118 Kiel, Germany
| | - Franz Faupel
- ITA Institute for Innovative Technologies, Köthen/Halle, Wiesenring 4, D-06120 Lieskau (Halle/S.), Germany; Leibniz Institute for Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany; Institute for Materials Research, Chair of Materials Compounds, Faculty of Engineering, Christian-Albrecht-University of Kiel, D-24118 Kiel, Germany
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