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Showing 1 to 20 of 22 for “"inverse gas chromatography"”.
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Characterization of block copolymers and polymer blends by inverse gas chromatography
The accuracy and utility of using Inverse Gas Chromatography (IGC) to characterize the microphase structure of block copolymers, and the strength of the thermodynamic interactions between the components of polymer blends and the unlike segments of block copolymers was examined. There were three …
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Investigation of Binding of Volatile Flavor Compounds by Soy Proteins in Low -Moisture Food Systems by Inverse Gas Chromatography (Igc)
IGC provided rapid and precise measurements of thermodynamic and sorption data. Flavor compound chemical structure greatly determined its binding potential to SPI. Weak binding of hydrocarbons to SPI was attributed to nonspecific van der Walls dispersion forces only, while stronger binding …
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Effects of soil moisture, soil carbonate and organic matter content on vapor phase sorption of volatile organic compounds using inverse gas chromatography
… chlorobenzene; heptane; and pentane. Inverse Gas Chromatography (IGC) was the primary method used to measure VOC sorption in these experiments. Sorption for all the evaluated VOCs decreased with increasing moisture. Non-reversibility in the water characteristic curve of water had …
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Investigation of Single and Multiple Binding Interactions Between Volatile Flavor Compounds and Soy Proteins Under Controlled Relative Humidity by Inverse Gas Chromatography (Igc)
These above mentioned studies are useful to the food industry and will aid in development of new processes for off-flavor removal in soy products, improve masking agent design and allow target for preferential flavor release for dry foods and ingredients.
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Effects of bacteria polysaccharide and cationic surfactant treatment on the sorption of volatile organic compounds by soil
… (TCE) and benzene onto soil were assessed using Inverse Gas Chromatography (IGC). Soils were treated with two different methods: (1) Soils were incubated with bacterial polysaccharide (to increase organic matter); (2) Soil was modified with cationic surfactant tetrabutyl-ammonium (TBA) and …
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The investigation of acid/base interactions in the adhesion of carbon fibers to thermoplastic matrices
… carbon fibers to thermoplastic polymer matrices. Inverse gas chromatography (IGC) and x-ray photoelectron spectroscopy (XPS) were used to characterize the acid/base nature of the carbon fiber surfaces. Capillary column IGC (CIGC) was used to determine the acid/base nature of thermoplastic polymer …
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I. Solubility and blend studies of nitrocellulose II. Relaxation properties of thin film coatings: the role of surface topography
… various solvent systems were investigated by Inverse Gas Chromatography. From these data, the solubility parameters of nitrocellulose were determined at a series of nitration levels which were used to guide the selection of suitable plasticizers for nitrocellulose films. Subsequent dynamic …
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ΜΕΛΕΤΗ ΤΗΣ ΥΔΡΟΛΥΣΗΣ, ΤΗΣ ΠΡΟΣΡΟΦΗΣΗΣ ΚΑΙ ΤΗΣ ΔΙΑΣΠΑΣΗΣ ΤΩΝ ΦΥΤΟΦΑΡΜΑΚΩΝ METHYL-PARATHION, LINDANE ΚΑΙ ATRAZINE ΣΕ ΦΥΣΙΚΑ ΥΠΟΣΤΡΩΜΑΤΑ
… CHARGE). IN CONDITIONS AND IN EXPERIMENTS OF INVERSE GAS CHROMATOGRAPHY IT WAS SHOWED THAT THE THERMODYNAMIC PARAMETERS OF ADSORPTION OF PESTICIDES (-ΔΗ) AND (-ΔS) APPEAR A LINEAR DEPENDENCE WITH THE ZERO POINT CHARGE OF SOLID SUBSTRATES.THE SOIL PROPERTIES AS FAR AS THE MOST RAPID …
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Characterization of polyethylene terephthalate, cellulose acetate and their blends
… surface characterizations and bulk examinations. Inverse Gas Chromatography (IGC) is employed to determine the surface free energies, the dispersive component and acid/base specific interactions, of polyethylene terephthalate (PET), cellulose acetate (CA) and their blend. Dynamic Contact Angle …
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Investigation to Identify the Influence of the Surface Energetics of the Dry Powder Formulations of Budesonide and Theophylline on Their Aerodynamic Dose Emission Characteristics.
… with different levels of surfactant using Inverse Gas Chromatography, and comparing them to their lung deposition performance using a Next Generation Impactor established a relationship between the two. A 1:10 mixing ratio of budesonide with either carrier was found to have the highest FPF. …
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Investigation of acid/base interactions in adhesion
… possible which were not possible in the other. Inverse gas chromatography (IGC) and Infrared spectroscopy (IR) techniques were used to analyze the model adhesive in terms of its acid/base nature. The results of both experiments indicated, through negative enthalpies of acid/base interaction with …
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Water ingression into poly(imide-siloxane)s
… adhesive durability in hot/wet environments. Inverse gas chromatography was used to conduct surface energetics studies on copolymers of different siloxane concentration and a polyirnide homopolymer. Free energies of specific interaction of water vapor, ΔG<sub>sp</sub>°, with the polymer …
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Toughened bismaleimides, their carbon fiber composites and interphase evaluation studies
… in terms of their surface energies using Inverse Gas Chromatography. It was illustrated how this technique could distinguish between the acid-base properties of fibers possessing different degrees of proprietary surface treatments. Fiber composites containing both contrasting and subtle …
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Characterization of Environmentally Friendly Polymers: Amylopectin and Its Blends
… of these blends were investigated using the Inverse Gas Chromatography (IGC) method. This was conducted over a range of temperatures until a complete set of data was obtained. Nineteen solutes with different chemical natures were selected in this study. Solutes, including a series of alkanes, …
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Effects of Thermomechanical Refining on Douglas fir Wood
… higher dimensional scale. Brunauer-Emmett-Teller gas adsorption and MIP showed that refining increased specific surface area, more so at the highest energy. Inverse gas chromatography showed that the lowest refining energy produced surfaces dominated by lignin and/or extractives. The highest …
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Particle engineering via surface modification during micronization for pharmaceutical applications
… of milled ibuprofen powders was investigated. Inverse Gas Chromatography technique was used and the dispersive surface energy of pure milled powders was heterogeneous in nature. In contrast, dry coating with nano-particles was found to quench the high energy sites and make the surface energy of …
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Cellulose fiber-reinforced thermoplastic composites: surface and adhesion characterization
… through Scanning Electron Microscopy. Inverse Gas Chromatography (IGC) was used to measure the surfaces' energetics. Two kinds of probes were used: alkanes to measure the dispersive component of adhesion, and acid/base probes to quantify the specific properties. Composites having …
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The Use of Solubility Parameters to Select Membrane Materials for Pervaporation of Organic Mixtures
… and potential use of thin channel inverse gas chromatography to determine a more accurate HSP which includes diffusivity.
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Novel Technology for Crystal Engineering of Pharmaceutical Solids
The research work described in this thesis, the environmentally friendly novel "Microwave Assisted Sub-Critical water (MASCW)" technology for particle engineering of active pharmaceutical ingredients and excipients was developed. The present novel technology MASCW process is described as green …
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