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Optical Properties of Composites Based on Poly(o-phenylenediamine), Poly(vinylenefluoride) and Double-Wall Carbon Nanotubes. Int J Mol Sci 2021; 22:ijms22158260. [PMID: 34361025 PMCID: PMC8348311 DOI: 10.3390/ijms22158260] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/16/2021] [Accepted: 07/26/2021] [Indexed: 01/11/2023] Open
Abstract
In this work, synthesis and optical properties of a new composite based on poly(o-phenylenediamine) (POPD) fiber like structures, poly(vinylidene fluoride) (PVDF) spheres and double-walled carbon nanotubes (DWNTs) are reported. As increasing the PVDF weight in the mixture of the chemical polymerization reaction of o-phenylenediamine, the presence of the PVDF spheres onto the POPD fibers surface is highlighted by scanning electron microscopy (SEM). The down-shift of the Raman line from 1421 cm−1 to 1415 cm−1 proves the covalent functionalization of DWNTs with the POPD-PVDF blends. The changes in the absorbance of the IR bands peaked around 840, 881, 1240 and 1402 cm−1 indicate hindrance steric effects induced of DWNTs to the POPD fiber like structures and the PVDF spheres, as a consequence of the functionalization process of carbon nanotubes with macromolecular compounds. The presence of the PVDF spheres onto the POPD fiber like structures surface induces a POPD photoluminescence (PL) quenching process. An additional PL quenching process of the POPD-PVDF blends is reported to be induced in the presence of DWNTs. The studies of anisotropic PL highlight a change of the angle of the binding of the PVDF spheres onto the POPD fiber like structures surface from 50.2° to 38° when the carbon nanotubes concentration increases in the POPD-PVDF/DWNTs composites mass up to 2 wt.%.
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Vandenabeele P, Edwards HGM, Jehlička J. The role of mobile instrumentation in novel applications of Raman spectroscopy: archaeometry, geosciences, and forensics. Chem Soc Rev 2014; 43:2628-49. [PMID: 24382454 DOI: 10.1039/c3cs60263j] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The applications of analytical Raman spectroscopy in the characterisation of materials associated with archaeologically excavated artefacts, forensic investigations of drugs of abuse, security and crime scenes, minerals and rocks and future astrobiological space missions are now well established; however, these applications have emphasised the need for new developments in the area of miniaturised instrumentation which extends the concept and breadth of the analytical requirement to facilitate the provision of data from 'in field' studies. In this respect, the apparently unrelated themes of art and archaeology, forensic science, geological science and astrobiology as covered by this review are unified broadly by the ability to record data nondestructively and without resorting to sampling and the subsequent transfer of samples to the analytical laboratory. In studies of works of art there has long been a requirement for on-site analysis, especially for valuable paintings held under strict museum security and for wall paintings which cannot physically be removed from their setting; similarly, the use of portable Raman spectroscopy in archaeological and geological field work as a first-pass screening device which obviates the necessity of multiple and wasteful specimen collection is high on the wish-list of practicing spectroscopists. As a first-pass screening probe for forensic crime scenes, Raman spectroscopy has proved to be of inestimable value for the early detection of dangerous and prohibited materials such as drugs of abuse, explosives and their chemical precursors, and banned contraband biomaterials such as ivories and animal products; in these applications the advantage of the Raman spectroscopic technique for the recognition of spectral signatures from mixtures of inorganic and organic compounds is paramount and not afforded by other less portable instrumental techniques. Finally, in astrobiological work, these requirements also apply but with the additional prerequisite for system operation remotely - often over distances of several hundred million kilometres - as part of instrumental suites on robotic spacecraft and planetary landers; this necessitates robust and reliable instrumentation for the observation of unique and characteristic spectral features from the planetary geological surface and subsurface which are dependent on the assignment of both biological and geological band signatures.
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Affiliation(s)
- P Vandenabeele
- Department of Archaeology, Ghent University, Sint-Pietersnieuwstraat 35, B-9000 Ghent, Belgium.
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Vandenabeele P. Evaluation of a spectral searching algorithm for the comparison of Raman band positions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 80:27-31. [PMID: 21237699 DOI: 10.1016/j.saa.2010.12.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 12/01/2010] [Accepted: 12/08/2010] [Indexed: 05/30/2023]
Abstract
Raman spectroscopic identification of unknown materials involves often the comparison of the spectrum of the unknown spectrum with previously recorded reference spectra or data from literature. However, when spectra with many Raman bands or spectra of mixtures are involved, searching can be quite complex. Different chemometrical approaches have been proposed, but these have some drawbacks. Therefore, in this paper a novel approach is proposed, which is based on a multivariate comparison of Raman band positions. Different similarity measures can be used and are evaluated with spectra of test samples that were recorded on different spectrometers, using different laser wavelengths. Moreover, this study evaluates the performances of this algorithm for identifying different compounds in mixtures, by using an iterative approach.
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Vázquez J, López González JJ, Márquez F, Martínez Torres E, Boggs JE. Transferability and Physicochemical Interpretation of Canonical Force Fields in Redundant Internal Coordinates: Pyridazine and 3,6-Dichloropyridazine. J Phys Chem A 2001. [DOI: 10.1021/jp010456i] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Vázquez
- Department of Physical and Analytical Chemistry, University of Jaén, Campus Las Lagunillas s/n, Jaén E-23071, Spain
| | - Juan J. López González
- Department of Physical and Analytical Chemistry, University of Jaén, Campus Las Lagunillas s/n, Jaén E-23071, Spain
| | - Fernando Márquez
- Department of Physical and Analytical Chemistry, University of Jaén, Campus Las Lagunillas s/n, Jaén E-23071, Spain
| | - Emilio Martínez Torres
- Department of Physical Chemistry, University of Castilla-La Mancha, Ciudad Real E-13071, Spain
| | - James E. Boggs
- Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712-1167
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Vázquez J, López González JJ, Márquez F, Pongor G, Boggs JE. Experimental and Theoretical Analysis of the Vibrational Spectra and Theoretical Study of the Structures of 3,6-Dichloropyridazine and 3,4,5-Trichloropyridazine. J Phys Chem A 2000. [DOI: 10.1021/jp9932160] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. Vázquez
- Department of Physical and Analytical Chemistry, University of Jaén. E-23071, Jaén, Spain, Department of Theoretical Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest 112, Hungary, and Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712
| | - J. J. López González
- Department of Physical and Analytical Chemistry, University of Jaén. E-23071, Jaén, Spain, Department of Theoretical Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest 112, Hungary, and Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712
| | - F. Márquez
- Department of Physical and Analytical Chemistry, University of Jaén. E-23071, Jaén, Spain, Department of Theoretical Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest 112, Hungary, and Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712
| | - G. Pongor
- Department of Physical and Analytical Chemistry, University of Jaén. E-23071, Jaén, Spain, Department of Theoretical Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest 112, Hungary, and Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712
| | - James E. Boggs
- Department of Physical and Analytical Chemistry, University of Jaén. E-23071, Jaén, Spain, Department of Theoretical Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest 112, Hungary, and Institute for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712
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Biswas N, Umapathy S. Density Functional Calculations of Structures, Vibrational Frequencies, and Normal Modes of trans- and cis-Azobenzene. J Phys Chem A 1997. [DOI: 10.1021/jp970312x] [Citation(s) in RCA: 147] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nandita Biswas
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Siva Umapathy
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore-560012, India
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Teppen BJ, Cao M, Frey RF, van Alsenoy C, Miller DM, Schäfer L. An investigation into intramolecular hydrogen bonding: impact of basis set and electron correlation on the ab initio conformational analysis of 1,2-ethanediol and 1,2,3-propanetriol. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/0166-1280(94)03809-y] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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