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Ortuso RD, Ricardi N, Bürgi T, Wesolowski TA, Sugihara K. The deconvolution analysis of ATR-FTIR spectra of diacetylene during UV exposure. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 219:23-32. [PMID: 31030044 DOI: 10.1016/j.saa.2019.04.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 04/10/2019] [Accepted: 04/14/2019] [Indexed: 06/09/2023]
Abstract
We performed a detailed deconvolution analysis of ATR-FTIR peaks of a common diacetylene, 10,12-tricosadiynoic acid (TRCDA) during the polymerization and the blue-to-red transition. Based on the analysis and the solvent dependence on the IR signals, we found that the triple peak from CC stretching mode that has been previously suspected as a consequence of Fermi resonance is rather associated with the macromolecular assembly of TRCDA. Besides these CC triple peaks, we found that the background in the region increased during the UV exposure due to the CC signals from polymers. In addition, the anisotropic compression during polymerization was also detected, which supports the proposed interpretation of X-ray data reported previously. These results are the benefits from the deconvolution analysis.
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Affiliation(s)
- Roberto D Ortuso
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Niccolò Ricardi
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Thomas Bürgi
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Tomasz A Wesolowski
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland
| | - Kaori Sugihara
- Department of physical chemistry, University of Geneva, 30 Quai Ernest Ansermet, Geneva, 1211, Switzerland.
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Gilzer D, Hillmann R, Goett-Zink L, Klocke JL, Viefhues M, Anselmetti D, Kottke T. Biphasic Formation of 2D Nanomembranes by Photopolymerization of Diacetylene Lipids as Revealed by Infrared Difference Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9343-9351. [PMID: 31242730 DOI: 10.1021/acs.langmuir.9b00660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Two-dimensional nanomembranes are promising materials for filtration or separation by providing the basis for controlled and rapid transport between two compartments. The polymerization by UV light of diacetylene-containing lipids at an interface produces free-standing 2D nanomembranes. Here, we analyzed in situ the nanomembrane formation of 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine (DiynePC) and 1-palmitoyl-2-(10,12-tricosadiynoyl)-sn-glycero-3-phosphoethanolamine (PTPE) on germanium using light-induced infrared difference spectroscopy with attenuated total reflection to obtain insights into the kinetics and mechanism of the polymerization process. Our interpretation is supported by atomic force microscopy and density functional theory. Formation of the polymer network is evidenced by changes in the frequency of C═O stretches acting as infrared probes. However, spectral and kinetic analysis revealed a biphasic process in the monolayer. In both phases, losses in signal of CH2 stretches are observed which are not in agreement with the accepted mechanism of chain propagation for diacetylene polymerization. These signals are dominant in the second phase and are assigned to termination reactions with some contributions from intramolecular consecutive reactions. This finding now provides a spectroscopic measure for the identity and integrity of the nanomembrane complementary to microscopic analysis. We deduce that limited 2D mobility on the solid support promotes intramolecular termination, leading to smaller domains.
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Affiliation(s)
- Dominic Gilzer
- Physical and Biophysical Chemistry, Department of Chemistry , Bielefeld University , Universitaetsstr. 25 , 33615 Bielefeld , Germany
| | - Roland Hillmann
- Experimental Biophysics and Applied Nanoscience, Department of Physics , Bielefeld University , Universitaetsstr. 25 , 33615 Bielefeld , Germany
| | - Lukas Goett-Zink
- Physical and Biophysical Chemistry, Department of Chemistry , Bielefeld University , Universitaetsstr. 25 , 33615 Bielefeld , Germany
| | - Jessica L Klocke
- Physical and Biophysical Chemistry, Department of Chemistry , Bielefeld University , Universitaetsstr. 25 , 33615 Bielefeld , Germany
| | - Martina Viefhues
- Experimental Biophysics and Applied Nanoscience, Department of Physics , Bielefeld University , Universitaetsstr. 25 , 33615 Bielefeld , Germany
| | - Dario Anselmetti
- Experimental Biophysics and Applied Nanoscience, Department of Physics , Bielefeld University , Universitaetsstr. 25 , 33615 Bielefeld , Germany
| | - Tilman Kottke
- Physical and Biophysical Chemistry, Department of Chemistry , Bielefeld University , Universitaetsstr. 25 , 33615 Bielefeld , Germany
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Hillmann R, Viefhues M, Goett-Zink L, Gilzer D, Hellweg T, Gölzhäuser A, Kottke T, Anselmetti D. Characterization of Robust and Free-Standing 2D-Nanomembranes of UV-Polymerized Diacetylene Lipids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3256-3263. [PMID: 29485886 DOI: 10.1021/acs.langmuir.7b03403] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Free-standing lipid membranes are promising as artificial functional membrane systems for application in separation, filtration, and nanopore sensing. To improve the mechanical properties of lipid membranes, UV-polymerized lipids have been introduced. We investigated free-standing as well as substrate-supported monolayers of 1-palmitoyl-2-(10,12-tricosadiynoyl)- sn-glycero-3-phosphoethanolamine (PTPE) and 1,2-bis(10,12-tricosadiynoyl)- sn-glycero-3-phosphocholine (DiynePC) and characterized them with respect to their structure, morphology, and stability. Using helium ion microscopy (HIM), we were able to visualize the integrity of the lipid 2D-nanomembranes spanning micrometer-sized voids under high-vacuum conditions. Atomic force microscopy (AFM) investigations under ambient conditions revealed formation of intact and robust pore-spanning 2D-nanomembranes up to 8 × 2 μm2 in size. Analysis by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) verified a distinct reduction of signal at 2143 cm-1 from diacetylene groups in the 2D-nanomembranes after UV-polymerization. Further high-resolution AFM investigations of unpolymerized lipid monolayers revealed a well-ordered two-dimensional network, when deposited on highly oriented pyrolytic graphite (HOPG). These structures were inhibited for polymerized adlayers. Structural models for the molecular arrangement of the adlayers are proposed and discussed.
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Mirza JA, Park H, Park SY, Ye SJ. Use of radiochromic film as a high-spatial resolution dosimeter by Raman spectroscopy. Med Phys 2016; 43:4520. [DOI: 10.1118/1.4955119] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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