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28 results on '"Deering, Connor E."'

19. Sol–gel synthesis of 2-dimensional TiO2: self-assembly of Ti–oxoalkoxy–acetate complexes by carboxylate ligand directed condensation.

Author

Sui, Ruohong, Deering, Connor E., Prinsloo, Rohen, Lavery, Christopher B., Chou, Nancy, and Marriott, Robert A.

Abstract

2-Dimensional (2D) metal oxides have many potential industrial applications including heterogeneous catalysis, water splitting, renewable energy conversion, supercapacitor applications, biomaterials, gas separation and gas storage. Herein we report a simple and scalable method for the preparation of 2D TiO2 nanostructures by reaction of titanium isopropoxide with acetic acid at 333 K in isopropanol, followed by calcination at 673 K to remove the organic ligands. Both the products and reaction intermediates have been studied using electron microscopy, X-ray diffraction, N2 physisorption, nuclear magnetic resonance, thermogravimetric analysis, and X-ray photoelectron, Raman, and infrared spectroscopy. The anisotropic condensation of the planar Ti6O4(OiPr)8(OAc)8 complex is believed to be responsible for the formation of the 2D structure, where OiPr and OAc represent isopropoxide and acetate ligands, respectively. This research demonstrates that the metal complexes are promising building blocks for desired architectures, and the self-assembly of an acetate bidentate ligand is a versatile tool for manipulating the shape of final products. [ABSTRACT FROM AUTHOR]

Published
2021
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20. High-Pressure Densities and Excess Molar Volumes for the Binary Mixture of Carbon Dioxide and Hydrogen Sulfide at T= 343–397 K

Author

Commodore, Jerry A., Deering, Connor E., Bernard, Francis, and Marriott, Robert A.

Abstract

A few studies have been carried out on the volumetric properties of binary systems of H2S + CO2, which are rich in CO2; however, no volumetric studies for acid gas fluids rich in H2S have been found in the open literature. Herein we report new high-precision density measurements for three compositions (x(CO2) = 0.09822, 0.26989, and 0.49556) for the CO2+ H2S binary system at T= 343–398 K and pressures up to p= 25 MPa. The measured mixture densities were compared to data from Stouffer et al. (J. Chem. Eng. Data2001, 46, 1309−1318. DOI: 10.1021/je000182c.) and Nazeri et al. (Fluid Phase Equilib.2016, 423, 156−171. DOI: 10.1016/j.fluid.2016.04.024.The measured density data showed agreement within ca. ±2% at high pressures and up to 4% in the vicinity of the critical point or high compressibility region. Additionally, we used our mixtures and interpolated pure fluid densities to calculate the excess molar volumes, to further ascertain the accuracy of the mixing coefficients provided by Kunz and Wagner (J. Chem. Eng. Data2012, 57, 3032−3091. DOI: 10.1021/je300655b.). The comparison of the calculated and experimental molar volumes showed good agreement to within ±2 cm3·mol–1, especially in the high-pressure region. Within the study, we considered the COS formation from the reaction of CO2+ H2S, which was a potential explanation for measurement failure in previous studies. The measured equilibrium concentrations of COS were low and showed that the reaction of CO2+ H2S to form COS was not facile at the measured conditions.

Published
2021
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24. Sol–Gel-Derived 2D Nanostructures of Aluminum Hydroxide Acetate: Toward the Understanding of Nanostructure Formation

Author

Sui, Ruohong, Lo, John M. H., Lavery, Christopher B., Deering, Connor E., Wynnyk, Kyle G., Chou, Nancy, and Marriott, Robert A.

Abstract

Two-dimensional (2D) metal oxide nanostructures have generated a great deal of attention in material science for their prospective wide-ranging applications; therefore, a scalable and economical method for producing these structures is an asset. In this research, a simple procedure for the preparation of 2D aluminum hydroxide acetate macromolecules ([Al(OH)(OAc)2]m) has been developed via a nonaqueous sol–gel route at a mild reaction temperature and ambient pressure. To gain a greater understanding of the mechanism for how the self-assembly of these 2D structures occurs, a combination of in situ Fourier transform infrared (FTIR) measurements and density functional theory (DFT) calculations were utilized. It was found that the bridging OH–1and coordination modes of the organic ligands guide the assembly of the planar nanostructures. The theoretical calculation results show that the structures of the [Al(OH)(OAc)2]8oligomer can be either a linear or a planar structure, and the latter is more thermodynamically favorable than its linear counterpart. The simple synthesis method described herein could possibly open a new avenue for designing 2D nanostructures via ligand-directed anisotropic condensation reactions.

Published
2024
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28. Sol-gel synthesis of 2-dimensional TiO 2 : self-assembly of Ti-oxoalkoxy-acetate complexes by carboxylate ligand directed condensation.

Author

Sui R, Deering CE, Prinsloo R, Lavery CB, Chou N, and Marriott RA

Abstract

2-Dimensional (2D) metal oxides have many potential industrial applications including heterogeneous catalysis, water splitting, renewable energy conversion, supercapacitor applications, biomaterials, gas separation and gas storage. Herein we report a simple and scalable method for the preparation of 2D TiO 2 nanostructures by reaction of titanium isopropoxide with acetic acid at 333 K in isopropanol, followed by calcination at 673 K to remove the organic ligands. Both the products and reaction intermediates have been studied using electron microscopy, X-ray diffraction, N 2 physisorption, nuclear magnetic resonance, thermogravimetric analysis, and X-ray photoelectron, Raman, and infrared spectroscopy. The anisotropic condensation of the planar Ti 6 O 4 (O i Pr) 8 (OAc) 8 complex is believed to be responsible for the formation of the 2D structure, where O i Pr and OAc represent isopropoxide and acetate ligands, respectively. This research demonstrates that the metal complexes are promising building blocks for desired architectures, and the self-assembly of an acetate bidentate ligand is a versatile tool for manipulating the shape of final products.

Published
2021
Full Text
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