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  Partner: UNT Libraries
 Department: Department of Chemistry
 Language: English
 Collection: UNT Theses and Dissertations
Characterization of Novel Solvents and Absorbents for Chemical Separations

Characterization of Novel Solvents and Absorbents for Chemical Separations

Date: May 2011
Creator: Grubbs, Laura Michelle Sprunger
Description: Predictive methods have been employed to characterize chemical separation mediums including solvents and absorbents. These studies included creating Abraham solvation parameter models for room-temperature ionic liquids (RTILs) utilizing novel ion-specific and group contribution methodologies, polydimethyl siloxane (PDMS) utilizing standard methodology, and the micelles cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS) utilizing a combined experimental setup methodology with indicator variables. These predictive models allows for the characterization of both standard and new chemicals for use in chemical separations including gas chromatography (GC), solid phase microextraction (SPME), and micellar electrokinetic chromatography (MEKC). Gas-to-RTIL and water-to-RTIL predictive models were created with a standard deviation of 0.112 and 0.139 log units, respectively, for the ion-specific model and with a standard deviation of 0.155 and 0.177 log units, respectively, for the group contribution fragment method. Enthalpy of solvation for solutes dissolved into ionic liquids predictive models were created with ion-specific coefficients to within standard deviations of 1.7 kJ/mol. These models allow for the characterization of studied ionic liquids as well as prediction of solute-solvent properties of previously unstudied ionic liquids. Predictive models were created for the logarithm of solute's gas-to-fiber sorption and water-to-fiber sorption coefficient for polydimethyl siloxane for wet and dry conditions. These models ...
Contributing Partner: UNT Libraries
A Chemical Analysis of Soft Wheat

A Chemical Analysis of Soft Wheat

Date: 1940
Creator: Truitt, Jack
Description: The purpose of this piece of research is to determine the chemical composition of soft winter wheat, and to make a comparative study of it. A study is also made concerning its possibilities as a balanced food.
Contributing Partner: UNT Libraries
A Chemical Analysis of the Blackeyed Pea

A Chemical Analysis of the Blackeyed Pea

Date: 1941
Creator: Davis, Stanley F.
Description: The purpose of this research problem is to determine the chemical composition of the blackeyed pea and to make a comparative study of the results. The value of the blackeyed pea as food, its chemical nature, and possible industrial uses are studied and recorded.
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Chemical Analysis of the Bottom Deposits of Artificial Lakes with Special Emphasis on Lake Dallas

Chemical Analysis of the Bottom Deposits of Artificial Lakes with Special Emphasis on Lake Dallas

Date: 1940
Creator: Patrick, Paul V.
Description: This study is for the purpose of determining the chemical content of typical artificial reservoir bottom deposits.
Contributing Partner: UNT Libraries
A Chemical Analysis of the Important Soils of Dimmit County, Texas

A Chemical Analysis of the Important Soils of Dimmit County, Texas

Date: August 1938
Creator: Meek, William
Description: The purpose of this study is to collect sample soils from uncontaminated horizon (by digging completely through the soil profile or strata) and provide a chemical analysis of the important soils of Dimmit county, Texas.
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The Chemical Analysis of the Mebane Cottonseed Kernel

The Chemical Analysis of the Mebane Cottonseed Kernel

Date: 1941
Creator: Hanna, Alvis Nelson
Description: The purpose of this work is to make a fairly complete chemical analysis of the Mebane 804-50 cottonseed kernel. A brief history of cotton plant and the economic value of its products are also presented.
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A Chemical Analysis of the Peanut

A Chemical Analysis of the Peanut

Date: 1940
Creator: Brown, Carlos L.
Description: The object of this paper is to make an analysis of the mineral and food content of the peanut and to compare them with a balanced food.
Contributing Partner: UNT Libraries
A Chemical Analysis of the Soils of Denton County, Texas

A Chemical Analysis of the Soils of Denton County, Texas

Date: August 1936
Creator: Wilson, Curtis
Description: The purpose of this study was to analyze the different soils in Denton, Texas. For the purpose of this study, the soils of Denton County are divided into three general groups with respect to origin: 1)those formed in place by the weathering of consolidated rocks, 2) those formed from the weathering of unconsolidated rocks, and 3) alluvial soils. A chemical analysis of representative samples of Bell Clay, Kirvin fine sandy loam, and San Saba clay has been made, and shown to have a strict correlation with their respective geological origins.
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The Chemical Analysis of the Tennessee Green Pod Pole Bean

The Chemical Analysis of the Tennessee Green Pod Pole Bean

Date: 1941
Creator: Mitchell, O. R.
Description: The object of this paper is to compare the Tennessee green pod pole bean with other beans as to chemical composition and food value.
Contributing Partner: UNT Libraries
Chemical Equilibria in Binary Solvents

Chemical Equilibria in Binary Solvents

Date: August 1997
Creator: McHale, Mary E. R.
Description: Dissertation research involves development of Mobile Order Theory thermodynamic models to mathematically describe and predict the solubility, spectral properties, protonation equilibrium constants and two-phase partitioning behavior of solutes dissolved in binary solvent mixtures of analytical importance. Information gained provide a better understanding of solute-solvent and solvent-solvent interactions at the molecular level, which will facilitate the development of better chemical separation methods based upon both gas-liquid and high-performance liquid chromatography, and better analysis methods based upon complexiometric and spectroscopic methods. Dissertation research emphasizes chemical equilibria in systems containing alcohol cosolvents with the understanding that knowledge gained will be transferable to more environmentally friendly aqueous-organic solvent mixtures.
Contributing Partner: UNT Libraries