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Wang H, Hayashi M. A density functional theory study of van der Waals interaction in carbon nanotubes. J CHIN CHEM SOC-TAIP 2023. [DOI: 10.1002/jccs.202200530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Affiliation(s)
- Houng‐Wei Wang
- Center for Condensed Matter Sciences National Taiwan University Taipei Taiwan
| | - Michitoshi Hayashi
- Center for Condensed Matter Sciences National Taiwan University Taipei Taiwan
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2
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Be Rziņš KR, Fraser-Miller SJ, Rades T, Gordon KC. Low-Frequency Raman Spectroscopy as an Avenue to Determine the Transition Temperature of β- and γ-Relaxation in Pharmaceutical Glasses. Anal Chem 2022; 94:8241-8248. [PMID: 35647784 DOI: 10.1021/acs.analchem.2c00371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In an earlier investigation, low-frequency Raman (LFR) spectroscopy was shown to detect the transition temperature of the β-relaxation (Tβ) in both amorphous celecoxib and various celecoxib amorphous solid dispersions [Be̅rziņš, K. Mol. Pharmaceutics 2021, 18(10), 3882-3893]. In this study, we further investigated the application of this technique to determine Tβ, an important parameter for estimating crystallization potency of amorphous drugs. Alongside commercially available amorphous drugs (zafirlukast and valsartan disodium salt), differently melt-quenched samples of cimetidine were also analyzed. Overall, the variable-temperature LFR measurements allowed for an easy access to the desired information, including the even lesser transition of the tertiary relaxation motions (Tγ). Thus, the obtained results not only highlighted the sensitivity, but also the practical usefulness of this technique to elucidate (subtle) changes in molecular dynamics within amorphous pharmaceutical systems.
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Affiliation(s)
- Ka Rlis Be Rziņš
- The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Chemistry, University of Otago, Dunedin 9016, New Zealand
| | - Sara J Fraser-Miller
- The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Chemistry, University of Otago, Dunedin 9016, New Zealand
| | - Thomas Rades
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 1165, Denmark
| | - Keith C Gordon
- The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Chemistry, University of Otago, Dunedin 9016, New Zealand
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3
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Lei X, Yao L, Lian Q, Zhang X, Wang T, Holmes W, Ding G, Gang DD, Zappi ME. Enhanced adsorption of perfluorooctanoate (PFOA) onto low oxygen content ordered mesoporous carbon (OMC): Adsorption behaviors and mechanisms. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126810. [PMID: 34365231 DOI: 10.1016/j.jhazmat.2021.126810] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 07/26/2021] [Accepted: 07/31/2021] [Indexed: 06/13/2023]
Abstract
The pollution of perfluorooctanoic acid (PFOA) in water bodies has been a serious threat to environment and human health. Ordered mesoporous carbons (OMCs) with different oxygen contents were prepared and first used for adsorbing PFOA from aqueous solutions. The OMC-900 with a lower oxygen content has a higher PFOA adsorption capacity than the oxygen-rich OMC-700. OMCs require a much shorter time to reach the adsorption equilibrium comparing with other adsorbents reported in literature. The mesopores play an important role in this rapid adsorption kinetics. The pseudo-second-order model better fitted the kinetic data. The multilayers adsorption was proposed for the adsorption of PFOA onto OMCs since the Freundlich isotherm model fits the experimental data well. The micelle or hemi-micelle structures may be formed during the adsorption. Various background salts showed a positive effect on PFOA adsorption due to the salting-out and divalent bridge effects. The humic acid can lead to a discernible reduction in PFOA adsorption by competing for adsorption sites on OMCs. The hydrophobic interaction and electrostatic interaction adsorption mechanisms were proposed and verified by the adsorption data. The high adsorption capacity and fast adsorption kinetics of the OMC make it a potential adsorbent for PFOA removal in engineering applications.
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Affiliation(s)
- Xiaobo Lei
- Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA; Center for Environmental Technology, The Energy Institute of Louisiana, University of Louisiana at Lafayette, P. O. Box 43597, Lafayette, LA 70504, USA
| | - Lunguang Yao
- Henan Key Laboratory of Ecological Security, Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, 1638 Wolong Rd, Nanyang, Henan, PR China
| | - Qiyu Lian
- Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA; Center for Environmental Technology, The Energy Institute of Louisiana, University of Louisiana at Lafayette, P. O. Box 43597, Lafayette, LA 70504, USA
| | - Xu Zhang
- Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA; Beijing International Scientific and Technological Cooperation Base of Water Pollution Control Techniques for Antibiotics and Resistance genes, School of Civil Engineering, Beijing Jiaotong University, 3 Shangyuancun, Beijing 100044, PR China
| | - Tiejun Wang
- Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA; Nanyang Vocational College of Agriculture, Nanyang 473000, PR China
| | - William Holmes
- Center for Environmental Technology, The Energy Institute of Louisiana, University of Louisiana at Lafayette, P. O. Box 43597, Lafayette, LA 70504, USA; Department of Chemical Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA
| | - Guoyu Ding
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiatong University, Beijing 100044, PR China
| | - Daniel Dianchen Gang
- Department of Civil Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA; Center for Environmental Technology, The Energy Institute of Louisiana, University of Louisiana at Lafayette, P. O. Box 43597, Lafayette, LA 70504, USA.
| | - Mark E Zappi
- Center for Environmental Technology, The Energy Institute of Louisiana, University of Louisiana at Lafayette, P. O. Box 43597, Lafayette, LA 70504, USA; Department of Chemical Engineering, University of Louisiana at Lafayette, Lafayette, LA 70504, USA
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Candau N, Chenal JM, Lame O, Schouwink P, Michaud V, Plummer CJ, Frauenrath H. Enhanced ductility in high performance polyamides due to strain-induced phase transitions. POLYMER 2022. [DOI: 10.1016/j.polymer.2021.124424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Bhatt S, Bagchi D. Molecular and micro-scale heterogeneities in Raman modes of a relaxing polymer glass. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:325101. [PMID: 34062521 DOI: 10.1088/1361-648x/ac06ec] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Accepted: 06/01/2021] [Indexed: 06/12/2023]
Abstract
We have used Raman spectroscopy to study relaxation dynamics at two different length scales, molecular level and micro-scale in order to probe the presence of cooperative rearranging regions in a polymer glass. Response to slow thermal cycles and fast quench through the glass transition temperature (Tg) is analyzed for film and unprocessed forms of polyvinyl acetate (PVAc). In PVAc film, enhanced disorder and molecular mobility lead to peak broadening by about a factor of 10 compared to unprocessed PVAc. Thermal cycles (10 K min-1) produce hysteresis in integrated Raman peak intensity (loop areaAINTI).AINTIvalues of film are two orders of magnitude more than unprocessed, indicating more configurational mosaics with higher interfacial energy dissipations. Ageing after 60 K min-1quench manifests as heterogeneous molecular dynamics of film Raman modes with significant peak-width variations, differentiating high mobility and low mobility modes. Two-dimensional mapping of film Raman modes after quench reveal micro-scale clusters of average size ≈250 molecules having fractal boundaries with fractal dimensiondf= 1.5, resemblingdfof percolation clusters below percolation threshold. During thermal cycling and relaxation after a quench, cooperative segmental dynamics with large correlations between skeletal C-C stretch and side branch modes is observed. The observations are analyzed in the context of the random first order transition theory of glasses, which attributes heterogeneous relaxations in glasses to the presence of clusters of variable configurational states.
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Affiliation(s)
- Shipra Bhatt
- Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390002, Gujarat, India
| | - Debjani Bagchi
- Department of Physics, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390002, Gujarat, India
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Bertoldo Menezes D, Reyer A, Benisek A, Dachs E, Pruner C, Musso M. Raman spectroscopic insights into the glass transition of poly(methyl methacrylate). Phys Chem Chem Phys 2021; 23:1649-1665. [PMID: 33411861 DOI: 10.1039/d0cp05627h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Poly(methyl methacrylate) (PMMA) is a very versatile polymer which is used as a glass substitute or as an economical alternative to polycarbonate for many types of important applications, due to its particular physical properties. In this study we deal with the Raman spectroscopic characterization of the glass transition of PMMA, the value of the glass transition temperature being generally a decisive parameter for determining the application of polymers. The information obtained by two-dimensional correlation spectroscopy (2DCOS) analysis and perturbation-correlation moving-windows spectroscopy (PCMW2D) analysis of the temperature dependent depolarized Raman spectra enabled us to recognize that the glass transition of PMMA is ruled by intermolecular interactions which influence the vibrational modes of the molecular groups associated with ν(C[double bond, length as m-dash]O), δa(C-H) of α-CH3 and/or O-CH3, ν(C-O-C), ν(C-COO), and ν(C-C-O). This information was employed for the temperature dependent study of the Raman shift and of the full width at half maximum of the Raman peaks obtained through anisotropic and isotropic Raman spectra, of the depolarization ratio, of the Raman spectroscopic noncoincidence effect, and of the Raman peak intensities represented by Arrhenius-type plots, all results supporting the outcomes of this work. The comparison with results obtained by differential scanning calorimetry and with published results in molecular dynamics studies was also part of this work. As the main result, one can highlight the peak associated with the ν(C-O-C) stretching mode at around 812 cm-1 as the one which presents the better outcome for explaining the glass transition from the molecular point of view.
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Affiliation(s)
- D Bertoldo Menezes
- Federal Institute of Triângulo Mineiro, 1020, 38400-970, Uberlândia, Minas Gerais, Brazil. and Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020, Salzburg, Austria
| | - A Reyer
- Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020, Salzburg, Austria
| | - A Benisek
- Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020, Salzburg, Austria
| | - E Dachs
- Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020, Salzburg, Austria
| | - C Pruner
- Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020, Salzburg, Austria
| | - M Musso
- Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020, Salzburg, Austria
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Samith VD, Navarro S, Dabirian R. Morphological and Semi-empirical Study of the Pluronic F68/Imogolite/Sudan III Intersurfaces Composite for the Controlled Temperature Release of Hydrophobic Drugs. ACS OMEGA 2020; 5:20707-20723. [PMID: 32875204 PMCID: PMC7450501 DOI: 10.1021/acsomega.9b02965] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 03/03/2020] [Indexed: 06/11/2023]
Abstract
Some PluronicF68 (F68) triblock copolymer properties demonstrate surprising applications in selective drug administration, such as the transportation of hydrophobic anti-inflammatories through epithelial barriers. Nuclear magnetic resonance (1H-NMR) spectroscopy was carried out for micelle precursor dispersions and F68 films modified with a synthetic imogolite (IMO) biocompatible hydrogel. Theoretical calculations and morphological assessment for the process of morphogenesis of dendritic crystallization were performed by molecular docking and atomic force microscopy (AFM) of the Sudan III-IMO-F68 composite, which was more hydrophobic than Sudan III-F68 and carried out the prolonged release of the Sudan III "drug" captured by a water-octanol interface determined by standard absorbance. Surface fusions were measured and compared to the unmodified matrix. However, despite the superior properties of the composite, the critical micelle concentration (CMC) was practically unmodified because solitary IMO strands attached to Sudan III formed Sudan III-IMO. These strands unraveled in a stable manner by expanding like a "spiderweb" in hydrophilic interfaces according to NMR analysis of the hydrogen one H1 polarization of Sudan III and F68 methyl, whose correlation relates hydrophobicity of Sudan III-IMO-F68 with dendrite properties from F68 concentrations. CMC and surface fusions equivalent to F68 surface properties, calculated by differential scanning calorimetry and dynamic Raman spectroscopy, were determined by AFM and high-resolution ellipsometry. Our results show highly specialized pharmacological applications since micelle surfaces expand, triggering maximum deliveries of "Drugs" from its interior to the physiological environment. The implanted sensor prototype determined equilibria reached Sudan III according to temperature (32-50 °C) and time it took to cross the membrane model 1-octanol (48 h). The findings suggest that the targested design of a F68-IMO-"Drug" would function as a microdevice for the prolonged release of hydrophobic drugs. In addition, the said microdevice could regenerate the damaged tissue in the central nervous system or other organs of the body. This is due to the fact that it could perform both tasks simultaneously, given the properties and characteristics acquired by the compatible material depending on the temperature of the physiological environment.
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Affiliation(s)
- Vicente D. Samith
- Departamento de
Química, Facultad de Ciencias, Universidad
de Chile, Las Palmeras 3425, Santiago 244355, Chile
- Institute for Medical
and Biological Engineering, Schools of Engineering, Biological Sciences
and Medicine, Pontificia Universidad Católica
de Chile, Santiago 7800003, Chile
| | - Sebastián Navarro
- Departamento de
Química, Facultad de Ciencias, Universidad
de Chile, Las Palmeras 3425, Santiago 244355, Chile
| | - Reza Dabirian
- Departamento de
Química, Facultad de Ciencias, Universidad
de Chile, Las Palmeras 3425, Santiago 244355, Chile
- Istituto per la Sintesi
Organica e la Fotoreattività, Consiglio
Nazionale delle Ricerche, Via Gobetti 101, 40129 Bologna, Italy
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Cerovic DD, Asanovic KA, Maletic SB, Marinkovic FS, Petronijevic IM, Dojcilovic JR. Electrophysical properties of woven polymer mesh fabrics. J Appl Polym Sci 2020. [DOI: 10.1002/app.48456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dragana D. Cerovic
- Faculty of PhysicsUniversity of Belgrade Studentski trg 12, 11000 Belgrade Serbia
- The College of Textile DesignTechnology and Management Starine Novaka 24, 11000 Belgrade Serbia
| | - Koviljka A. Asanovic
- Department of Textile Engineering, Faculty of Technology and MetallurgyUniversity of Belgrade Karnegijeva 4, 11000 Belgrade Serbia
| | - Slavica B. Maletic
- Faculty of PhysicsUniversity of Belgrade Studentski trg 12, 11000 Belgrade Serbia
| | - Filip S. Marinkovic
- Faculty of PhysicsUniversity of Belgrade Studentski trg 12, 11000 Belgrade Serbia
| | - Ivan M. Petronijevic
- Faculty of PhysicsUniversity of Belgrade Studentski trg 12, 11000 Belgrade Serbia
| | - Jablan R. Dojcilovic
- Faculty of PhysicsUniversity of Belgrade Studentski trg 12, 11000 Belgrade Serbia
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Hetmańczyk J, Nowicka-Scheibe J, Maurin JK, Pawlukojć A. Low temperature investigations of dynamic properties in l-leucine - chloranilic acid complex. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 200:281-289. [PMID: 29702418 DOI: 10.1016/j.saa.2018.03.070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2017] [Revised: 03/20/2018] [Accepted: 03/25/2018] [Indexed: 06/08/2023]
Abstract
Inelastic neutron scattering (INS) and infra-red (IR) spectroscopy methods were used for determination of dynamic structure of l-leucine - chloranilic acid complex. A theoretical dynamic pattern calculated by the density functional theory (DFT) method for periodic boundary conditions accompanied the experimental ones. Normal modes in the vibrational spectra were defined and described. The characteristic presence of the Hadži's trio enriched by numerous submaxima is observed in the wavenumber range 3200-800 cm-1. Bands assigned to CH3 torsion vibrations in the leucine cation were observed at 231 cm-1 and 258 cm-1 in the INS spectrum. Temperature-dependent far-infrared spectra in the temperature range 9 K-290 K were obtained. Vibrational bands were analyzed as a function of temperature. Activation energies for reorientational motion of CH3 and CH2 groups were determined by means of the band shape analysis performed for torsional and twisting vibrations of these groups. The estimated energy is equal to Ea = 2.7 ± 0.2 kJ/mol and Ea = 2.17 ± 0.12 kJ/mol for CH3 and CH2 groups, respectively. A phase transition at about 130 K in the l-leucine - chloranilic acid complex was observed.
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Affiliation(s)
- J Hetmańczyk
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2 str., 30-387 Cracow, Poland
| | - J Nowicka-Scheibe
- Faculty of Chemical Technology and Engineering, Institute of Chemistry and Environmental Protection, West Pomeranian University of Technology, Al. Piastów 42, 71-065 Szczecin, Poland
| | - J K Maurin
- National Medicines Institute, Chełmska 30/34 str., 00-725 Warsaw, Poland; National Centre for Nuclear Research, Sołtana 7, 05-400 Otwock, Poland
| | - A Pawlukojć
- Institute of Nuclear Chemistry and Technology, Dorodna 16 str., 03-195 Warszawa, Poland; Joint Institute for Nuclear Research, 141-980 Dubna, Russia.
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Bertoldo Menezes D, Reyer A, Musso M. Investigation of the Brill transition in nylon 6,6 by Raman, THz-Raman, and two-dimensional correlation spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 190:433-441. [PMID: 28961527 DOI: 10.1016/j.saa.2017.09.055] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/19/2017] [Accepted: 09/19/2017] [Indexed: 06/07/2023]
Abstract
The Brill transition is a phase transition process in polyamides related with structural changes between the hydrogen bonds of the lateral functional groups (CO) and (NH). In this study, we have used the potential of Raman spectroscopy for exploring this phase transition in polyamide 6,6 (nylon 6,6), due to the sensitivity of this spectroscopic technique to small intermolecular changes affecting vibrational properties of relevant functional groups. During a step by step heating and cooling process of the sample we collected Raman spectra allowing us from two-dimensional Raman correlation spectroscopy to identify which spectral regions suffered the largest influence during the Brill transition, and from Terahertz Stokes and anti-Stokes Raman spectroscopy to obtain complementary information, e.g. on the temperature of the sample. This allowed us to grasp signatures of the Brill transition from peak parameters of vibrational modes associated with (CC) skeletal stretches and (CNH) bending, and to verify the Brill transition temperature at around 160°C, as well as the reversibility of this phase transition.
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Affiliation(s)
- D Bertoldo Menezes
- Federal Institute of the Triângulo Mineiro, Mailbox: 1020, Zip Code 38400-970, Uberlândia, Minas Gerais, Brazil; Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020 Salzburg, Austria.
| | - A Reyer
- Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020 Salzburg, Austria
| | - M Musso
- Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Strasse 2a, 5020 Salzburg, Austria
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