Anne E. Marteel‐Parrish

Green chemistry and engineering : a pathway to sustainability

With this text as their guide, students will gain a new outlook on chemistry and engineering. The text fully covers introductory concepts in general, organic, inorganic, and analytical chemistry as well as biochemistry. At the same time, it integrates such concepts as greenhouse gas potential, alternative and renewable energy, solvent selection and recovery, and ecotoxicity. As a result, students learn how to design chemical products and processes that are sustainable and environmentally friendly.

Generality of the environmentally benign catecholate method to the synthesis of barium-based perovskites

Abstract Barium titanate, barium zirconate, and barium hafnate are essential components of the electroceramic industry. Barium titanate is essentially used as multi-layered ceramic capacitors in computers, aerospace, and communication technologies. Barium zirconate is one of the most inert, stable, and corrosion-resistant perovskite employed in superconducting applications. Barium hafnate is used as a component of hybrid ceramic structures for high-temperature applications. The goal of this research was to apply a more environmentally benign synthesis design to the production of barium-based perovskites. The catecholate method, originally applied to the synthesis of barium titanate, was utilized as the approach for the synthesis of barium zirconate and barium hafnate. This developmental process consumed naturally occurring isomorphic forms of metal oxides and no post-sintering treatment was necessary. It resulted in the absence of by-products in most steps while achieving superior stoichiometric control over the barium-to-X (X=Ti, Zr, Hf) molar ratio compared to previous methods.

Toward a more environmentally benign synthesis of doped barium titanate

Abstract Barium titanate is one of the most thoroughly studied members of the perovskite family due to its prominent place in the electroceramic industry. To be used as a capacitor at room temperature, a high-dielectric constant is needed which is achieved through doping. The focus of this research was to develop a more environmentally benign alternative to the doping of barium titanate. The barium source was barium titanyl catecholate, Ba[Ti(cat)3] (aq) and the doping sources were strontium oxalate (SrC2O4) and strontium carbonate (SrCO3). The doping strategies included a solid-state synthetic pathway as well as microwave- and centrifuge-assisted methods which both employed water as the only solvent. The last two benign by design methods were tested with respect to their thermodynamic control over barium-to-strontium stoichiometric ratios. These methods of doping proved to be more environmentally friendly and economical while combining green chemistry and materials science.

Tris(4-acetamido­phenoxy­methyl)methanol 0.7-hydrate

The asymmetric unit of the title compound, C28H31N3O7·0.7H2O, contains a molecule of tris(4-acetamidophenoxymethyl)methanol and 0.7 of a water molecule. An extensive hydrogen-bonding network includes interactions between all components of the crystal structure.