The Experts below are selected from a list of 3102 Experts worldwide ranked by ideXlab platform
Adam Voelkel - One of the best experts on this subject based on the ideXlab platform.
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the solubility parameter for biomedical polymers application of Inverse Gas Chromatography
Journal of Pharmaceutical and Biomedical Analysis, 2016Co-Authors: Katarzyna Adamska, Adam Voelkel, A BerlinskaAbstract:The solubility parameter seems to be a useful tool for thermodynamic characterisation of different materials. The solubility parameter concept can be used to predict sufficient miscibility or solubility between a solvent and a polymer, as well as components of co-polymer matrix in composite biomaterials. The values of solubility parameter were determined for polycaprolactone (PCL), polylactic acid (PLA) and polyethylene glycol (PEG) by using different procedures and experimental data, collected by means of Inverse Gas Chromatography.
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surface energy of bovine dentin and enamel by means of Inverse Gas Chromatography
Materials Science and Engineering: C, 2015Co-Authors: Zuzanna Okulus, Beata Strzemiecka, Beata Czarnecka, Tomasz Buchwald, Adam VoelkelAbstract:Abstract Adhesion between tooth tissues and dental fillings depends on the surface energy of both connected materials. Bond strength can be determined directly or indirectly as a work of adhesion on the basis of values of surface energy of these materials. Inverse Gas Chromatography (IGC) is one of the methods of surface energy examination. In this study the values of total surface energy components of wet and dry teeth fragments (enamel, crown dentin and root dentin) were determined with the use of Inverse Gas Chromatography. Inverse Gas Chromatography has never been used for investigation of surface energy of natural tooth tissues. Different storage conditions were examined — wet and dry. Different values of surface energy are observed according to the type of tooth tissue (dentin or enamel), occurring place (crown or root) and storage conditions (dry or wet). The effect of tissue type and occurring place was the greatest, while storage conditions were of secondary importance. Surface energy depends on composition of tissue, its surface area and the presence of pores.
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assessment of the chemical changes during storage of phenol formaldehyde resins pyrolysis Gas Chromatography mass spectrometry Inverse Gas Chromatography and fourier transform infra red methods
Journal of Chromatography A, 2014Co-Authors: Beata Strzemiecka, Adam Voelkel, J Ziebapalus, T LachowiczAbstract:The chemical changes occurring in the phenol-formaldehyde resins (resol and novolac type) during their storage were investigated. In this paper the FT-IR, py-GCMS and Inverse Gas Chromatography methods were applied for assessment of the changes occurring during storage of the phenolic resins. We have found that during storage some examined resins occurred partial curing. The results from all techniques applied are consistent. Py-GCMS is useful technique for screening the storage processes but IGC seems to be most sensitive one.
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Inverse Gas Chromatography as a source of physiochemical data
Journal of Chromatography A, 2009Co-Authors: Adam Voelkel, Katarzyna Adamska, Beata Strzemiecka, Kasylda MilczewskaAbstract:Inverse Gas Chromatography (IGC) is presented as a useful method for the examination of physicochemical properties of various materials. The advantages of IGC are presented. However, the uncertainties and sources of possible errors are also indicated and discussed.
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New procedure for the determination of Hansen solubility parameters by means of Inverse Gas Chromatography
Journal of Chromatography A, 2008Co-Authors: Katarzyna Adamska, Rainer Bellinghausen, Adam VoelkelAbstract:Abstract The Hansen solubility parameter (HSP) seems to be a useful tool for the thermodynamic characterization of different materials. Unfortunately, estimation of the HSP values can cause some problems. In this work different procedures by using Inverse Gas Chromatography have been presented for calculation of pharmaceutical excipients’ solubility parameter. The new procedure proposed, based on the Lindvig et al. methodology, where experimental data of Flory–Huggins interaction parameter are used, can be a reasonable alternative for the estimation of HSP values. The advantage of this method is that the values of Flory–Huggins interaction parameter χ for all test solutes are used for further calculation, thus diverse interactions between test solute and material are taken into consideration.
F. Mutelet - One of the best experts on this subject based on the ideXlab platform.
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Study of Ether-, Alcohol-, or Cyano-Functionalized Ionic Liquids Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2010Co-Authors: A.l. Revelli, F. Mutelet, J.-n. Jaubert, M. Garcia-martinez, L.m. Sprunger, W.e. Acree Jr., G.a. BakerAbstract:Activity coefficients of 52 organic compounds in four ionic liquids (ILs), 1,3-dimethoxyimidazolium bis((trifluoromethyl)sulfonyl)imide, 1-(methylethylether)-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide, 1-ethanol-3-methylimidazolium bis((trifluoromethyl)-sulfonyl)imide, and 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide, were measured using Inverse Gas Chromatography from (312 to 353) K. The retention data were also converted in Gas-to-IL partition coefficients and water-to-IL partition coefficients using the corresponding Gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the modified Abraham solvation parameter model. The derived equations correlated the experimental Gas-to-IL and water-to-IL partition coefficient data to within (0.09 and 0.14) log units, respectively.
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Partition coefficients of organic compounds in new imidazolium based ionic liquids using Inverse Gas Chromatography
Journal of Chromatography, 2009Co-Authors: A.l. Revelli, F. Mutelet, J.-n. JaubertAbstract:Partition coefficients of organic compounds in four ionic liquids: 1-ethanol-3-methylimidazolium tetrafluoroborate, 1-ethanol-3-methylimidazolium hexafluorophosphate, 1,3-dimethylimidazolium dimethylphosphate and 1-ethyl-3-methylimidazolium diethylphosphate were measured using Inverse Gas Chromatography from 303.3 to 332.55 K. The influence of Gas-liquid and Gas-solid interfacial adsorption of different solutes on ionic liquids was also studied. Most of the polar solutes were retained largely by partition while light hydrocarbons were retained predominantly by interfacial adsorption on the ionic liquids studied in this work. The solvation characteristics of the ionic liquids were evaluated using the Abraham solvation parameter model.
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Activity Coefficients at Infinite Dilution of Organic Compounds in Trihexyl(tetradecyl)phosphonium Bis(trifluoromethylsulfonyl)imide Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: A.l. Revelli, W.e. Acree Jr., G.a. Baker, M. Sprunger, J. Gibbs, F. MuteletAbstract:Activity coefficients at infinite dilution γ∞ of organic compounds in the ionic liquid (IL) trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide were determined using Inverse Gas Chromatography at three temperatures, T = (302.45, 322.35, and 342.45) K. Linear free energy relationship (LFER) correlations have been obtained for describing the Gas-to-IL and water-to-IL partition coefficients.
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Partition Coefficients of Organic Compounds in New Imidazolium and Tetralkylammonium Based Ionic Liquids Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: F. Mutelet, A.l. Revelli, J.-n. Jaubert, W.e. Acree Jr., M. Sprunger, G.a. BakerAbstract:Partition coefficients of 51 organic compounds in two ionic liquids (IL), 1-ethyl-3-methylimidazolium dicyanamide and trimethylhexylammonium bis((trifluoromethyl)sulfonyl)amide, were measured using Inverse Gas Chromatography from (322.5 to 352.5) K. These partition coefficients were converted into water-to-IL partition coefficients using the corresponding Gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the Abraham solvation parameter model with cation-specific and anion-specific equation coefficients. The derived equations correlated the experimental Gas-to-IL and water-to-IL partition coefficient data to within (0.12 and 0.14) log units, respectively.
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Activity Coefficients at Infinite Dilution of Organic Compounds in 1-Butyl-3-methylimidazolium Tetrafluoroborate Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: A.l. Revelli, F. Mutelet, Mireille Turmine, R. Solimando, J.-n. JaubertAbstract:Activity coefficients at infinite dilution (γ∞) of organic compounds in the room-temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate were determined using Inverse Gas Chromatography from (303.35 to 332.55) K. Retention data were used to estimate the influence of Gas−liquid and Gas−solid interfacial adsorption on the value of activity coefficients at infinite dilution of solutes in this ionic liquid. Most of the polar solutes were retained largely by partition, while n-alkanes were retained predominantly by interfacial adsorption on the ionic liquid studied. The solvation characteristics of the ionic liquid were evaluated using the Abraham solvation parameter model.
Nereida Cordeiro - One of the best experts on this subject based on the ideXlab platform.
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physicochemical surface properties of bacterial cellulose polymethacrylate nanocomposites an approach by Inverse Gas Chromatography
Carbohydrate Polymers, 2019Co-Authors: Marisa Faria, Nereida Cordeiro, Carla Vilela, Armando J D Silvestre, Bhanumathyamma Deepa, Matic Resnik, Carmen S R FreireAbstract:Abstract Nanocomposites of poly(glycidyl methacrylate) and bacterial cellulose (BC), or poly(poly(ethylene glycol) methacrylate) and BC were produced via the in-situ polymerization of methacrylic monomers, inside the BC 3D network. The nanocomposites surface properties were evaluated by Inverse Gas Chromatography (IGC). The dispersive component of surface energy ( γ s d ) varied between 35.64 - 83.05 mJ m−2 at 25 °C. The surface of the different nanocomposites has a predominant basic character (Kb/Ka = 4.20-4.31). Higher specific interactions with polar probes were found for the nanocomposite bearing pendant epoxide groups, that apart from the low surface area ( S B E T = 0.83 m2 g−1) and monolayer capacity ( n m = 2.18 μmol g−1), exhibits a high value of γ s d (88.19 mJ m−2 at 20 °C). These results confirm the potential of IGC to differentiate between nanocomposites with different surface functional groups and to predict their potential interactions with living tissues, body fluids and other materials.
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investigation on the surface properties of chemically modified natural fibers using Inverse Gas Chromatography
Carbohydrate Polymers, 2012Co-Authors: Nereida Cordeiro, Mariana Ornelas, Alireza Ashori, Shabnam Sheshmani, Hor NorouziAbstract:This paper presents the application of Inverse Gas Chromatography (IGC) technique for characterization and comparison of the surface properties of the natural fibers as reinforcement fillers in wood plastic composites. The effects of chemical modification using 1% NaOH were also studied. The fibers used for this work were Iranian cultivated eucalyptus, spruce, baGasse, and wheat straw. Chemical composition of fibers was found to be modified after treatment as characterized by Fourier transform infrared spectroscopy (FTIR). The crystallinity of fibers and the specific interaction was improved by the alkaline treatment, with more relevance to the agro-fibers. The IGC shows also a general increase in the wettability of the modified fiber when compared with the raw (unmodified) samples. Alkaline treatment achieves the best overall improvement in the properties evaluated of the agro-fibers when compared to the wood fibers.
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natural fibers characterization by Inverse Gas Chromatography
Carbohydrate Polymers, 2011Co-Authors: Nereida Cordeiro, C Gouveia, A G O Moraes, Sandro Campos AmicoAbstract:Abstract Vegetable fibers can be considered as naturally occurring composites, consisting mainly of cellulose, lignin and hemicellulose. Their properties are significantly affected by many factors such as variety, climate, harvesting and maturity, among others. Thus, prior to their application, the fibers should be properly characterized. In the present study, Inverse Gas Chromatography was used to study the surface properties of several cellulosic fibers and the effect of an alkaline treatment. Dispersive surface energy ranged from 38.41 mJ/m 2 for piassava to 52.39 mJ/m 2 for assai. The studied fibers presented Lewis basic character with a K b / K a ratio between 1.27 and 4.00, corresponding to curaua and pita Mexicana, respectively. Based on the obtained linear adsorption isotherms, the surface area and monolayer capacity were higher for piassava. Pita Mexicana appeared to be the most heterogeneous one, with two energetic sites. The alkaline treatment of sisal increased the number of active sites for specific interactions, significantly increasing its basic character. It also increased its surface area, with a consequent decrease in the diffusion coefficient.
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investigation of surface properties of physico chemically modified natural fibres using Inverse Gas Chromatography
Industrial Crops and Products, 2011Co-Authors: Nereida Cordeiro, C Gouveia, Jacob M JohnAbstract:Abstract Inverse Gas Chromatography (IGC) is a suitable method to determine surface energy of natural fibres when compared to wetting techniques. In the present study, the surface properties of raw and modified lignocellulosic fibres have been investigated by IGC. The fibres chosen for the study were flax, hemp, kenaf, agave, agave hybrid, sisal and pineapple. The treatments used were 4% NaOH and 2% zein. The uniqueness of zein treatment is that it is bio-based and therefore maintains the biodegradable character of the natural fibres. Fourier transform infrared spectroscopy (FTIR) and environmental scanning electron microscope (ESEM) were also performed to characterize the surface changes in fibres. The surface properties of fibres are influenced by the chemical composition, crystallinity and morphology of the fibres. Bast fibres exhibited higher surface dispersive energy than leaf fibres. The raw fibres have a predominant basic character, whereas the alkaline treatment makes the fibres more acidic. Both alkaline and zein treatments decrease the dispersive surface energy and the specific free energy of adsorption.
A.l. Revelli - One of the best experts on this subject based on the ideXlab platform.
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Study of Ether-, Alcohol-, or Cyano-Functionalized Ionic Liquids Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2010Co-Authors: A.l. Revelli, F. Mutelet, J.-n. Jaubert, M. Garcia-martinez, L.m. Sprunger, W.e. Acree Jr., G.a. BakerAbstract:Activity coefficients of 52 organic compounds in four ionic liquids (ILs), 1,3-dimethoxyimidazolium bis((trifluoromethyl)sulfonyl)imide, 1-(methylethylether)-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide, 1-ethanol-3-methylimidazolium bis((trifluoromethyl)-sulfonyl)imide, and 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide, were measured using Inverse Gas Chromatography from (312 to 353) K. The retention data were also converted in Gas-to-IL partition coefficients and water-to-IL partition coefficients using the corresponding Gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the modified Abraham solvation parameter model. The derived equations correlated the experimental Gas-to-IL and water-to-IL partition coefficient data to within (0.09 and 0.14) log units, respectively.
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Partition coefficients of organic compounds in new imidazolium based ionic liquids using Inverse Gas Chromatography
Journal of Chromatography, 2009Co-Authors: A.l. Revelli, F. Mutelet, J.-n. JaubertAbstract:Partition coefficients of organic compounds in four ionic liquids: 1-ethanol-3-methylimidazolium tetrafluoroborate, 1-ethanol-3-methylimidazolium hexafluorophosphate, 1,3-dimethylimidazolium dimethylphosphate and 1-ethyl-3-methylimidazolium diethylphosphate were measured using Inverse Gas Chromatography from 303.3 to 332.55 K. The influence of Gas-liquid and Gas-solid interfacial adsorption of different solutes on ionic liquids was also studied. Most of the polar solutes were retained largely by partition while light hydrocarbons were retained predominantly by interfacial adsorption on the ionic liquids studied in this work. The solvation characteristics of the ionic liquids were evaluated using the Abraham solvation parameter model.
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Activity Coefficients at Infinite Dilution of Organic Compounds in Trihexyl(tetradecyl)phosphonium Bis(trifluoromethylsulfonyl)imide Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: A.l. Revelli, W.e. Acree Jr., G.a. Baker, M. Sprunger, J. Gibbs, F. MuteletAbstract:Activity coefficients at infinite dilution γ∞ of organic compounds in the ionic liquid (IL) trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)imide were determined using Inverse Gas Chromatography at three temperatures, T = (302.45, 322.35, and 342.45) K. Linear free energy relationship (LFER) correlations have been obtained for describing the Gas-to-IL and water-to-IL partition coefficients.
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Partition Coefficients of Organic Compounds in New Imidazolium and Tetralkylammonium Based Ionic Liquids Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: F. Mutelet, A.l. Revelli, J.-n. Jaubert, W.e. Acree Jr., M. Sprunger, G.a. BakerAbstract:Partition coefficients of 51 organic compounds in two ionic liquids (IL), 1-ethyl-3-methylimidazolium dicyanamide and trimethylhexylammonium bis((trifluoromethyl)sulfonyl)amide, were measured using Inverse Gas Chromatography from (322.5 to 352.5) K. These partition coefficients were converted into water-to-IL partition coefficients using the corresponding Gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the Abraham solvation parameter model with cation-specific and anion-specific equation coefficients. The derived equations correlated the experimental Gas-to-IL and water-to-IL partition coefficient data to within (0.12 and 0.14) log units, respectively.
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Activity Coefficients at Infinite Dilution of Organic Compounds in 1-Butyl-3-methylimidazolium Tetrafluoroborate Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: A.l. Revelli, F. Mutelet, Mireille Turmine, R. Solimando, J.-n. JaubertAbstract:Activity coefficients at infinite dilution (γ∞) of organic compounds in the room-temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate were determined using Inverse Gas Chromatography from (303.35 to 332.55) K. Retention data were used to estimate the influence of Gas−liquid and Gas−solid interfacial adsorption on the value of activity coefficients at infinite dilution of solutes in this ionic liquid. Most of the polar solutes were retained largely by partition, while n-alkanes were retained predominantly by interfacial adsorption on the ionic liquid studied. The solvation characteristics of the ionic liquid were evaluated using the Abraham solvation parameter model.
J.-n. Jaubert - One of the best experts on this subject based on the ideXlab platform.
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Study of Ether-, Alcohol-, or Cyano-Functionalized Ionic Liquids Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2010Co-Authors: A.l. Revelli, F. Mutelet, J.-n. Jaubert, M. Garcia-martinez, L.m. Sprunger, W.e. Acree Jr., G.a. BakerAbstract:Activity coefficients of 52 organic compounds in four ionic liquids (ILs), 1,3-dimethoxyimidazolium bis((trifluoromethyl)sulfonyl)imide, 1-(methylethylether)-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide, 1-ethanol-3-methylimidazolium bis((trifluoromethyl)-sulfonyl)imide, and 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide, were measured using Inverse Gas Chromatography from (312 to 353) K. The retention data were also converted in Gas-to-IL partition coefficients and water-to-IL partition coefficients using the corresponding Gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the modified Abraham solvation parameter model. The derived equations correlated the experimental Gas-to-IL and water-to-IL partition coefficient data to within (0.09 and 0.14) log units, respectively.
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Partition coefficients of organic compounds in new imidazolium based ionic liquids using Inverse Gas Chromatography
Journal of Chromatography, 2009Co-Authors: A.l. Revelli, F. Mutelet, J.-n. JaubertAbstract:Partition coefficients of organic compounds in four ionic liquids: 1-ethanol-3-methylimidazolium tetrafluoroborate, 1-ethanol-3-methylimidazolium hexafluorophosphate, 1,3-dimethylimidazolium dimethylphosphate and 1-ethyl-3-methylimidazolium diethylphosphate were measured using Inverse Gas Chromatography from 303.3 to 332.55 K. The influence of Gas-liquid and Gas-solid interfacial adsorption of different solutes on ionic liquids was also studied. Most of the polar solutes were retained largely by partition while light hydrocarbons were retained predominantly by interfacial adsorption on the ionic liquids studied in this work. The solvation characteristics of the ionic liquids were evaluated using the Abraham solvation parameter model.
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Partition Coefficients of Organic Compounds in New Imidazolium and Tetralkylammonium Based Ionic Liquids Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: F. Mutelet, A.l. Revelli, J.-n. Jaubert, W.e. Acree Jr., M. Sprunger, G.a. BakerAbstract:Partition coefficients of 51 organic compounds in two ionic liquids (IL), 1-ethyl-3-methylimidazolium dicyanamide and trimethylhexylammonium bis((trifluoromethyl)sulfonyl)amide, were measured using Inverse Gas Chromatography from (322.5 to 352.5) K. These partition coefficients were converted into water-to-IL partition coefficients using the corresponding Gas-to-water partition coefficients. Both sets of partition coefficients were analyzed using the Abraham solvation parameter model with cation-specific and anion-specific equation coefficients. The derived equations correlated the experimental Gas-to-IL and water-to-IL partition coefficient data to within (0.12 and 0.14) log units, respectively.
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Activity Coefficients at Infinite Dilution of Organic Compounds in 1-Butyl-3-methylimidazolium Tetrafluoroborate Using Inverse Gas Chromatography
Journal of Chemical and Engineering Data, 2009Co-Authors: A.l. Revelli, F. Mutelet, Mireille Turmine, R. Solimando, J.-n. JaubertAbstract:Activity coefficients at infinite dilution (γ∞) of organic compounds in the room-temperature ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate were determined using Inverse Gas Chromatography from (303.35 to 332.55) K. Retention data were used to estimate the influence of Gas−liquid and Gas−solid interfacial adsorption on the value of activity coefficients at infinite dilution of solutes in this ionic liquid. Most of the polar solutes were retained largely by partition, while n-alkanes were retained predominantly by interfacial adsorption on the ionic liquid studied. The solvation characteristics of the ionic liquid were evaluated using the Abraham solvation parameter model.
