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Akbari AA, Zarghampour A, Hashemzadeh N, Hemmati S, Rahimpour E, Jouyban A. Solubility and thermodynamics of mesalazine in aqueous mixtures of poly ethylene glycol 200/600 at 293.2-313.2K. ANNALES PHARMACEUTIQUES FRANÇAISES 2024; 82:800-812. [PMID: 38579928 DOI: 10.1016/j.pharma.2024.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 03/26/2024] [Accepted: 03/31/2024] [Indexed: 04/07/2024]
Abstract
In this study, the solubility of mesalazine was investigated in binary solvent mixtures of poly ethylene glycols 200/600 and water at temperatures ranging from 293.2K to 313.2K. The solubility of mesalazine was determined using a shake-flask method, and its concentrations were measured using a UV-Vis spectrophotometer. The obtained solubility data were analyzed using mathematical models including the van't Hoff, Jouyban-Acree, Jouyban-Acree-van't Hoff, mixture response surface, and modified Wilson models. The experimental data obtained for mesalazine dissolution encompassed various thermodynamic properties, including ΔG°, ΔH°, ΔS°, and TΔS°. These properties offer valuable insights into the energetic aspects of the dissolution process and were calculated based on the van't Hoff equation.
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Affiliation(s)
- Anali Ali Akbari
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Aynaz Zarghampour
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Nastaran Hashemzadeh
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Salar Hemmati
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elaheh Rahimpour
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran; Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, 5165665811 Tabriz, Iran.
| | - Abolghasem Jouyban
- Pharmaceutical Analysis Research Center and Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran; Faculty of Pharmacy, Near East University, Po Box: 99138, North Cyprus, Mersin 10, Nicosia, Turkey
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Tayari F, Dhahri R, Elkenany EB, Teixeira SS, Graça MPF, Al-Syadi AM, Essid M, Iben Nassar K. Crystal Structural Characteristics and Electrical Properties of Novel Sol-Gel Synthesis of Ceramic Bi 0.75Ba 0.25(FeMn) 0.5O 3. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3797. [PMID: 39124461 PMCID: PMC11313187 DOI: 10.3390/ma17153797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2024] [Revised: 07/22/2024] [Accepted: 07/26/2024] [Indexed: 08/12/2024]
Abstract
In this investigation, our primary objective is to explore the structural, morphological, and electrical characteristics of Bi0.75Ba0.25(FeMn)0.5O3 ceramic material synthesized by the sol-gel method. The prepared sample underwent synthesis through the conventional sol-gel technique. Examination through X-ray diffraction (XRD) unveiled a well-defined rhombohedral structure within the R3´C space group. Moreover, to evaluate the purity and nano-grain morphology, we utilized energy dispersive spectroscopy (EDX) and scanning electron microscopy (SEM). Electrical assessments were carried out over a frequency span of 100 Hz to 1 MHz and temperatures ranging from 200 to 340 K. Employing the correlated barrier hopping (CBH) model, we analyzed the AC conductivity of our specimen. The activation energy, determined from both DC conductivity and impedance spectra, demonstrated close correspondence, suggesting that both conductivity and r laxation processes are influenced by similar factors. Notably, the dielectric properties hold significant importance, potentially rendering our sample suitable for electronic applications. Furthermore, we calculated thermodynamic parameters, such as enthalpy (ΔH), entropy change (ΔS), and free energy of activation (ΔF), offering deeper insights into the material's behavior and conductivity mechanisms.
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Affiliation(s)
- Faouzia Tayari
- i3N-Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (F.T.); (S.S.T.); (M.P.F.G.); (M.E.)
| | - Ramzi Dhahri
- Department of Physics, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia; (E.B.E.); (A.M.A.-S.)
| | - Elkenany Brens Elkenany
- Department of Physics, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia; (E.B.E.); (A.M.A.-S.)
| | - Sílvia Soreto Teixeira
- i3N-Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (F.T.); (S.S.T.); (M.P.F.G.); (M.E.)
| | | | - A. M. Al-Syadi
- Department of Physics, College of Science and Arts, Najran University, Najran 11001, Saudi Arabia; (E.B.E.); (A.M.A.-S.)
| | - Manel Essid
- i3N-Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (F.T.); (S.S.T.); (M.P.F.G.); (M.E.)
| | - Kais Iben Nassar
- i3N-Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal; (F.T.); (S.S.T.); (M.P.F.G.); (M.E.)
- CICECO—Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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Lee D, Yang M, Choi UH, Kim J. Bioinspired Synaptic Branched Network within Quasi-Solid Polymer Electrolyte for High-Performance Microsupercapacitors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308821. [PMID: 38308357 DOI: 10.1002/smll.202308821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 01/14/2024] [Indexed: 02/04/2024]
Abstract
The branched network-driven ion solvating quasi-solid polymer electrolytes (QSPEs) are prepared via one-step photochemical reaction. A poly(ethylene glycol diacrylate) (PEGDA) is combined with an ion-conducting solvate ionic liquid (SIL), where tetraglyme (TEGDME), which acts like interneuron in the human brain and creates branching network points, is mixed with EMIM-NTf2 and Li-NTf2. The QSPE exhibits a unique gyrified morphology, inspired by the cortical surface of human brain, and features well-refined nano-scale ion channels. This human-mimicking method offers excellent ion transport capabilities through a synaptic branched network with high ionic conductivity (σDC ≈ 1.8 mS cm-1 at 298 K), high dielectric constant (εs ≈ 125 at 298 K), and strong ion solvation ability, in addition to superior mechanical flexibility. Furthermore, the interdigitated microsupercapacitors (MSCs) based on the QSPE present excellent electrochemical performance of high energy (E = 5.37 µWh cm-2) and power density (P = 2.2 mW cm-2), long-term cycle stability (≈94% retention after 48 000 cycles), and mechanical stability (>94% retention after continuous bending and compressing deformation). Moreover, these MSC devices have flame-retarding properties and operate effectively in air and water across a wide temperature range (275 to 370 K), offering a promising foundation for high-performance, stable next-generation all-solid-state energy storage devices.
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Affiliation(s)
- Dawoon Lee
- Department of Photonics and Nanoelectronics, Hanyang University, Ansan, 15588, Republic of Korea
- BK21 FOUR ERICA-ACE Center, Hanyang University, Ansan, 15588, Republic of Korea
| | - Mino Yang
- Korea Basic Science Insititute (Seoul), Seoul, 02841, Republic of Korea
| | - U Hyeok Choi
- Department of Polymer Science and Engineering and Program in Environmental and Polymer Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Jaekyun Kim
- Department of Photonics and Nanoelectronics, Hanyang University, Ansan, 15588, Republic of Korea
- BK21 FOUR ERICA-ACE Center, Hanyang University, Ansan, 15588, Republic of Korea
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Wu Q, Yuan Y, Wang X, Bu X, Jiao M, Liu W, Han C, Hu L, Wang X, Li X. Highly Selective Ionic Gel-Based Gas Sensor for Halogenated Volatile Organic Compound Detection: Effect of Dipole-Dipole Interaction. ACS Sens 2023; 8:4566-4576. [PMID: 37989128 DOI: 10.1021/acssensors.3c01476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Halogenated volatile organic compounds (abbreviated as X-VOCs) are a class of hazardous gas pollutants that are difficult to detect due to their thermal stability, chemical inertness, and poisoning effect on gas sensors at high temperatures. In this work, room-temperature detection of X-VOCs is achieved using a surface acoustic wave (SAW) gas sensor coated with a 1-ethyl-3-methylimidazolium bis(trifluoromethylsufonyl)imide (EMIM-TFSI)-based ionic gel film. We experimentally verify that the high selectivity of the ionic gel-based SAW gas sensor for X-VOCs is due to the presence of halogen atoms in these gas molecules. Meanwhile, the sensor has very little response to common organic gases such as ethanol, isopropanol, and acetone, reflecting a low cross-sensitivity to nonhalogenated VOCs. This unique advantage shows potential applications in selective detection of X-VOCs and is validated by comparison with a commercial metal oxide semiconductor (MOS) sensor. Furthermore, the internal sensing mechanism is explored by the density functional theory (DFT) method. The simulation results demonstrate that the X-VOC molecules are highly polarized by the inductive effect of halogen atom substitution, which is beneficial for being adsorbed by the EMIM-TFSI ionic liquid via dipole-dipole interaction.
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Affiliation(s)
- Qiang Wu
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
| | - Yubin Yuan
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
| | - Xuming Wang
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
| | - Xiangrui Bu
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
| | - Menglong Jiao
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
| | - Weihua Liu
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
| | - Chuanyu Han
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
| | - Long Hu
- Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China
| | - Xiaoli Wang
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
- School of Science, Xi'an Jiaotong University, Xi'an 710049, China
| | - Xin Li
- School of Microelectronics, School of Electronics and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China
- The Key Lab of Micro-Nano Electronics and System Integration of Xi'an City, Xi'an 710049, China
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Thome C, Hoertdoerfer WS, Bendorf JR, Lee JG, Shields CW. Electrokinetic Active Particles for Motion-Based Biomolecule Detection. NANO LETTERS 2023; 23:2379-2387. [PMID: 36881680 PMCID: PMC10038089 DOI: 10.1021/acs.nanolett.3c00319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Detection of biomolecules is essential for patient diagnosis, disease management, and numerous other applications. Recently, nano- and microparticle-based detection has been explored for improving traditional assays by reducing required sample volumes and assay times as well as enhancing tunability. Among these approaches, active particle-based assays that couple particle motion to biomolecule concentration expand assay accessibility through simplified signal outputs. However, most of these approaches require secondary labeling, which complicates workflows and introduces additional points of error. Here, we show a proof-of-concept for a label-free, motion-based biomolecule detection system using electrokinetic active particles. We prepare induced-charge electrophoretic microsensors (ICEMs) for the capture of two model biomolecules, streptavidin and ovalbumin, and show that the specific capture of the biomolecules leads to direct signal transduction through ICEM speed suppression at concentrations as low as 0.1 nM. This work lays the foundation for a new paradigm of rapid, simple, and label-free biomolecule detection using active particles.
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Affiliation(s)
- Cooper
P. Thome
- Department of Chemical and
Biological Engineering, University of Colorado
Boulder, Boulder, Colorado 80303, United States
| | - Wren S. Hoertdoerfer
- Department of Chemical and
Biological Engineering, University of Colorado
Boulder, Boulder, Colorado 80303, United States
| | - Julia R. Bendorf
- Department of Chemical and
Biological Engineering, University of Colorado
Boulder, Boulder, Colorado 80303, United States
| | - Jin Gyun Lee
- Department of Chemical and
Biological Engineering, University of Colorado
Boulder, Boulder, Colorado 80303, United States
| | - C. Wyatt Shields
- Department of Chemical and
Biological Engineering, University of Colorado
Boulder, Boulder, Colorado 80303, United States
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6
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Kaur P, Juglan KC, Kumar H, Singla M. Acoustical and volumetric investigation of EG, DEG, and TEG in chloroxylenol-methanol solutions at different temperatures. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2023. [DOI: 10.1007/s43153-023-00305-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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Hoffmann MM, Too MD, Paddock NA, Horstmann R, Kloth S, Vogel M, Buntkowsky G. On the Behavior of the Ethylene Glycol Components of Polydisperse Polyethylene Glycol PEG200. J Phys Chem B 2023; 127:1178-1196. [PMID: 36700884 PMCID: PMC9923754 DOI: 10.1021/acs.jpcb.2c06773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Molecular dynamics (MD) simulations are reported for [polyethylene glycol (PEG)200], a polydisperse mixture of ethylene glycol oligomers with an average molar weight of 200 g·mol-1. As a first step, available force fields for describing ethylene glycol oligomers were tested on how accurately they reproduced experimental properties. They were found to all fall short on either reproducing density, a static property, or the self-diffusion coefficient, a dynamic property. Discrepancies with the experimental data increased with the increasing size of the tested ethylene glycol oligomer. From the available force fields, the optimized potential for liquid simulation (OPLS) force field was used to further investigate which adjustments to the force field would improve the agreement of simulated physical properties with experimental ones. Two parameters were identified and adjusted, the (HO)-C-C-O proper dihedral potential and the polarity of the hydroxy group. The parameter adjustments depended on the size of the ethylene glycol oligomer. Next, PEG200 was simulated with the OPLS force field with and without modifications to inspect their effects on the simulation results. The modifications to the OPLS force field significantly decreased hydrogen bonding overall and increased the propensity of intramolecular hydrogen bond formation at the cost of intermolecular hydrogen bond formation. Moreover, some of the tri- and more so tetraethylene glycol formed intramolecular hydrogen bonds between the hydroxy end groups while still maintaining strong intramolecular interactions with the ether oxygen atoms. These observations allowed the interpretation of the obtained RDFs as well as structural properties such as the average end-to-end distances and the average radii of gyration. The MD simulations with and without the modifications showed no evidence of preferential association of like-oligomers to form clusters nor any evidence of long-range ordering such as a side-by-side stacking of ethylene glycol oligomers. Instead, the simulation results support the picture of PEG200 being a random mixture of its ethylene glycol oligomer components. Finally, additional MD simulations of a binary mixture of tri-and hexaethylene glycol with the same average molar weight as PEG200 revealed very similar structural and physical properties as for PEG200.
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Affiliation(s)
- Markus M. Hoffmann
- Department
of Chemistry and Biochemistry, State University
of New York College at Brockport, Brockport, New York14420, United States,. Phone: + 1(585) 395-5587. Fax: + 1(585) 395-5805
| | - Matthew D. Too
- Department
of Chemistry and Biochemistry, State University
of New York College at Brockport, Brockport, New York14420, United States
| | - Nathaniel A. Paddock
- Department
of Chemistry and Biochemistry, State University
of New York College at Brockport, Brockport, New York14420, United States
| | - Robin Horstmann
- Institute
of Condensed Matter Physics, Technical University
Darmstadt, Hochschulstraße
6, 64289Darmstadt, Germany
| | - Sebastian Kloth
- Institute
of Condensed Matter Physics, Technical University
Darmstadt, Hochschulstraße
6, 64289Darmstadt, Germany
| | - Michael Vogel
- Institute
of Condensed Matter Physics, Technical University
Darmstadt, Hochschulstraße
6, 64289Darmstadt, Germany
| | - Gerd Buntkowsky
- Institute
of Physical Chemistry, Technical University
Darmstadt, Alarich-Weiss-Straße
8, D-64287Darmstadt, Germany,. Phone: + 49 6151 16-21116. Fax: + 49 6151 16-21119
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Chávez M, Sánchez-Obrero G, Madueño R, Manuel Sevilla J, Blázquez M, Pineda T. Effects of the potential and the electrolyte nature in the integrity of the O-(2-Mercaptoethyl)-O′-methyl-hexa(ethylene glycol) self-assembled monolayer by electrochemical impedance spectroscopy. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Volumetric and Ultrasonic Studies on Interactions of Hexylene and Propylene Glycols in Aqueous Solutions of Glutaraldehyde at Different Temperatures. J SOLUTION CHEM 2022. [DOI: 10.1007/s10953-022-01192-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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10
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Tabboon P, Pongjanyakul T, Limpongsa E, Jaipakdee N. Mucosal Delivery of Cannabidiol: Influence of Vehicles and Enhancers. Pharmaceutics 2022; 14:pharmaceutics14081687. [PMID: 36015313 PMCID: PMC9412444 DOI: 10.3390/pharmaceutics14081687] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/03/2022] [Accepted: 08/11/2022] [Indexed: 11/16/2022] Open
Abstract
In this study, the mucosal permeation and deposition of cannabidiol (CBD) with neat and binary vehicles were investigated. Permeation experiments were performed using static diffusion cells coupled with fresh porcine esophageal mucosa. The CBD-vehicle solutions were applied at a fixed dose (~5 mg/cm2), and the corresponding permeation parameters were calculated. In neat vehicles, the permeation flux (Jss) ranged from 0.89 ± 0.15 to 179.81 ± 23.46 µg·cm-2·h-1, while the CBD deposition ranged from 11.5 ± 1.8 to 538.3 ± 105.3 μg·cm-2. Propylene glycol (PG) and diethylene glycol monoethyl ether (DEGEE) yielded the highest permeability (Ps) and CBD deposition, while medium-chain triglycerides (MCT) yielded the lowest Ps and deposition. This was due to the difference in apparent partition coefficient (K), which is related to the solubility of CBD in the vehicle. The PG:DEGEE binary vehicle boosted Jss (1.5-1.6 fold) and deposition (2.0-2.7 folds) significantly, compared to neat DEGEE. The combination of DEGEE with MCT dramatically enhanced Jss (11-44 fold) and deposition (1.6-4.7 fold). The addition of lipophilic enhancers, laurocapram, and oleic acid, to PG:DEGEE and DEGEE:MCT vehicles significantly reduced Jss (0.3-0.7 fold) and deposition (0.4-0.8 fold) while nerolidol had no effect. These permeation reductions were found to be related to modification of the K and/or diffusivity values. This study provides useful basic information for the development of CBD formulations intended for transmucosal delivery.
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Affiliation(s)
- Peera Tabboon
- Division of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand
- Center for Research and Development of Herbal Health Products, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Thaned Pongjanyakul
- Division of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Ekapol Limpongsa
- College of Pharmacy, Rangsit University, Pathum Thani 12000, Thailand
- Correspondence: (E.L.); (N.J.); Tel.: +66-80-5194956 (E.L.); +66-81-9749228 (N.J.)
| | - Napaphak Jaipakdee
- Division of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen 40002, Thailand
- Center for Research and Development of Herbal Health Products, Khon Kaen University, Khon Kaen 40002, Thailand
- Correspondence: (E.L.); (N.J.); Tel.: +66-80-5194956 (E.L.); +66-81-9749228 (N.J.)
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12
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Kaur P, Chakraborty N, Juglan K, Kumar H, Singla M. Temperature dependent physicochemical studies propylene and hexylene glycols in methanol solutions of chlorhexidine. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Aguilella-Arzo M, Aguilella VM. PEG Equilibrium Partitioning in the α-Hemolysin Channel: Neutral Polymer Interaction with Channel Charges. Biomacromolecules 2020; 22:410-418. [PMID: 33337868 DOI: 10.1021/acs.biomac.0c01286] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We study the interaction of neutral polyethylene glycol (PEG) molecules of different molecular weights (MWs) with the charged residues of the α-hemolysin channel secreted by Staphylococcus aureus. Previously reported experiments of PEG equilibrium partitioning into this nanopore show that the charge state of the channel changes the ability of PEG entry in an MW-dependent manner. We explain such an effect by parameter-free calculations of the PEG self-energy from the channel 3D atomic structure that include repulsive dielectrophoretic and hydrostatic forces on the polymer. We found that the pH-induced shift in the measured free energy of partitioning ΔΔGexp from single-channel conductance measurements agrees with calculated energy changes ΔΔEcalc. Our results show that the PEG-sizing technique may need corrections in the case of charged biological pores.
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Affiliation(s)
- Marcel Aguilella-Arzo
- Laboratory of Molecular Biophysics, Department of Physics, Universitat Jaume I, Castellón 12071, Spain
| | - Vicente M Aguilella
- Laboratory of Molecular Biophysics, Department of Physics, Universitat Jaume I, Castellón 12071, Spain
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Ultrasonic and volumetric behaviour of glycols with sodium ethylparaben in aqueous medium from T = 293.15 to 308.15 K at atmospheric pressure. RESULTS IN CHEMISTRY 2020. [DOI: 10.1016/j.rechem.2020.100049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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15
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Hassen AB, Rhouma FIH, Daoudi M, Dhahri J, Zaidi M, Abdelmoula N. Influence of defect on the electrical and optical properties of A-site non-stoichiometry Ca 0.67La 0.22□ 0.11Ti (1-x)Cr x O 3-δ perovskite. RSC Adv 2019; 9:19285-19296. [PMID: 35519417 PMCID: PMC9065166 DOI: 10.1039/c9ra02815c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Accepted: 05/21/2019] [Indexed: 11/30/2022] Open
Abstract
An investigation of the dielectric dispersion, electrical properties, scaling behavior and optical defects of Ca0.67La0.22□0.11Ti(1-x)Cr x O3-δ (CLT(1-x)Cr x ) with x = 0 and x = 0.1 compositions is presented. The square in the formula is attributed to a vacancy in A-site. Relaxation phenomena were studied with dielectric and modulus formalism, while, the conductivity mechanism was investigated using electrical conductivity. A high permittivity of around 104, low dielectric loss and low electrical conductivity of around 10-3 S cm-1 for Ca0.67La0.22TiO3 (CLT) was observed. These values make this composition interesting for microelectric applications. A comparison between the Z'' and M'' indicated that the short-range carrier motion dominates at low temperature and becomes less localized at high temperature. The optical defects of CLT and Ca0.67La0.22Ti0.9Cr0.1O3 (CLT0.9Cr0.1) were studied by electron paramagnetic resonance (EPR) spectroscopy. The results suggest the formation of a [TiO6]9- center, a (Ti3+-V O) center, and dipole defect for CLT compound and Cr3+-V O center defect for CLT0.9Cr0.1 compound. These defects are the source of the in-gap electron traps, which improve the optical properties of CLT(1-x)Cr x and hence make it an interesting optical material for different applications.
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Affiliation(s)
- A B Hassen
- Laboratoire de La Matière Condensée et des Nanosciences, Département de Physique, Faculté des Sciences de Monastir 5019 Tunisia
| | - F I H Rhouma
- Laboratoire de Photovoltaïque de Semi-conducteurs et de Nanostructures, Centre de Recherche des Scienes et Technologies de L'Energie BP. 95 Hammam-Lif 2050 Tunisia
| | - M Daoudi
- Laboratoire de Recherche Energie et Matière pour Les Développements des Sciences Nucléaire, Centre National des Sciences et Technologie Nucléaires 2020 Sidi-Thabet Tunisia
| | - J Dhahri
- Laboratoire de La Matière Condensée et des Nanosciences, Département de Physique, Faculté des Sciences de Monastir 5019 Tunisia
| | - M Zaidi
- Université de Monastir, Laboratoire de Micro-optoélectroniques et Nanostructures (LMON) Monastir 5000 Tunisia
| | - N Abdelmoula
- Laboratory of Multifunctional Materials and Applications (LaMMA), (LR16ES18), Faculty of Sciences of Sfax, University of Sfax B. P. 1171 3000 Sfax Tunisia
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Maher S, Medani M, Carballeira NN, Winter DC, Baird AW, Brayden DJ. Development of a Non-Aqueous Dispersion to Improve Intestinal Epithelial Flux of Poorly Permeable Macromolecules. AAPS JOURNAL 2016; 19:244-253. [DOI: 10.1208/s12248-016-9996-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/21/2016] [Indexed: 11/30/2022]
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Sonkamble AA, Sonsale RP, Kanshette MS, Kabara KB, Wananje KH, Kumbharkhane AC, Sarode AV. Relaxation dynamics and thermophysical properties of vegetable oils using time-domain reflectometry. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2016; 46:283-291. [PMID: 27604548 DOI: 10.1007/s00249-016-1165-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Revised: 07/14/2016] [Accepted: 08/22/2016] [Indexed: 10/21/2022]
Abstract
Dielectric relaxation studies of vegetable oils are important for insights into their hydrogen bonding and intermolecular dynamics. The dielectric relaxation and thermo physical properties of triglycerides present in some vegetable oils have been measured over the frequency range of 10 MHz to 7 GHz in the temperature region 25 to 10 °C using a time-domain reflectometry approach. The frequency and temperature dependence of dielectric constants and dielectric loss factors were determined for coconut, peanut, soya bean, sunflower, palm, and olive oils. The dielectric permittivity spectra for each of the studied vegetable oils are explained using the Debye model with their complex dielectric permittivity analyzed using the Havriliak-Negami equation. The dielectric parameters static permittivity (ε 0), high-frequency limiting static permittivity (ε ∞), average relaxation time (τ 0), and thermodynamic parameters such as free energy (∆F τ), enthalpy (∆H τ), and entropy of activation (∆S τ) were also measured. Calculation and analysis of these thermodynamic parameters agrees with the determined dielectric parameters, giving insights into the temperature dependence of the molecular dynamics of these systems.
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Affiliation(s)
- Anil A Sonkamble
- School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, 431 606, Maharashtra, India
| | - Rahul P Sonsale
- Yeshwanth Jr. Collage, Umri Dist, Nanded, 431 606, Maharashtra, India
| | | | - Komal B Kabara
- School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, 431 606, Maharashtra, India
| | - Kunal H Wananje
- Ramkrishna Paramhans Mahavidhyalaya, Osmanabad, 413 501, Maharashtra, India
| | - Ashok C Kumbharkhane
- School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, 431 606, Maharashtra, India
| | - Arvind V Sarode
- School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded, 431 606, Maharashtra, India.
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Sengwa R, Choudhary S, Dhatarwal P. Effect of ionic contaminants on dielectric dispersion and relaxation processes over static permittivity frequency region in neat liquid poly(ethylene glycol). J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.05.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Choi UH, Liang S, Chen Q, Runt J, Colby RH. Segmental Dynamics and Dielectric Constant of Polysiloxane Polar Copolymers as Plasticizers for Polymer Electrolytes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:3215-3225. [PMID: 26735584 DOI: 10.1021/acsami.5b10797] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dielectric relaxation spectroscopy was used to investigate the segmental dynamics of a series of siloxane-based polar copolymers combining pendant cyclic carbonates and short poly(ethylene oxide) (PEO) chains. The homopolymer with cyclic carbonate as the only side chain exhibits higher glass transition temperature T(g) and dielectric constant ε(s) than the one with only PEO side chains. For their copolymers the observed T(g) (agreeing well with the predicted values from the Fox equation) and ε(s) decrease with increasing PEO side chain content. These polar polymers exhibit a glassy β relaxation with Arrhenius character, attributed to local chain motions of side groups attached to the main chain, and a segmental α relaxation, associated with the glass transition with a Vogel temperature dependence. As PEO side chain content increases, narrowing of the local glassy β relaxation was observed in the copolymers. The segmental α dynamics were observed to be faster, with an increase in breadth and decrease in strength with increasing PEO side chain content. Owing to the trade-off between T(g) and ε(s), copolymers of intermediate composition result in the highest ionic conductivity when these copolymers are used to plasticize Li single-ion conducting ionomers.
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Affiliation(s)
- U Hyeok Choi
- Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Functional Composites Department, Korea Institute of Materials Science , Changwon 642-831, Korea
| | - Siwei Liang
- Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States
- Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory , One Cyclotron Road, Berkeley, California 94720, United States
| | - Quan Chen
- Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences , Changchun 130022, People's Republic of China
| | - James Runt
- Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Ralph H Colby
- Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States
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Mohamed CB, Karoui K, Jomni F, Guidara K, Rhaiem AB. Electrical properties and conduction mechanism of [C2H5NH3]2CuCl4 compound. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.11.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Comparative dielectric relaxation study of pentaethylene glycol (PEG) and hexaethylene glycol (HEG) in water mixture using time domain reflectometry. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.07.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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22
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Guchhait B, Biswas R. Ionic arrest of segmental motion and emergence of spatio-temporal heterogeneity: A fluorescence investigation of (polyethylene glycol + electrolyte) composites. J Chem Phys 2013; 138:114909. [DOI: 10.1063/1.4795583] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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