At the University of Colorado, I have helped pioneer a new technique to probe depositional ice nucleation onto internally mixed ammonium sulfate/palmitic acid particles, namely optical microscopy coupled with Raman microscopy. The deliquescence and efflorescence phase transitions of the mixed particles were first studied to gain insight into whether the particles are likely to be liquid or solid in the tropical tropopause region. The ice nucleating ability of the particles was then measured under typical upper tropospheric conditions. It was found that coating the particles with insoluble palmitic acid had little effect on the deliquescence, efflorescence or ice nucleating ability of ammonium sulfate. Additional experiments involving Raman mapping provided new insights into how the composition and morphology of mixed particles impact their ability to nucleate ice. Future research will be devoted to studying other types of particles using the Raman system.
keywords
aerosols, ice nucleation, cloud formation, water uptake
CHEM 1021 - Introductory Chemistry
Primary Instructor
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Fall 2021 / Spring 2022 / Spring 2023 / Fall 2024
For students with no high school chemistry or a very weak chemistry background. Remedies a deficiency in natural science MAPS requirements and prepares students for CHEM 1113 and CHEM 1114 or CHEM 1400 and CHEM 1401. No credit given to chemistry or biochemistry majors for this course if students already have credit in any college-level chemistry course numbered 1113/1114 or higher. Department enforced prerequisite: one year high school algebra or concurrent enrollment in MATH 1011.
CHEM 1113 - General Chemistry 1
Primary Instructor
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Summer 2023 / Fall 2023 / Summer 2024
Intended for first-semester students whose academic plans require advanced work in chemistry. Subjects: components of matter, stolchiometry, classes of reactions, gases, thermochemistry, atomic structure, electron configuration, chemical bonding, molecular shapes, covalent bonding, organic compounds, intermolecular forces, equilibrium. Department enforced prerequsites: one year high school chemistry or CHEM 1021 (min grade C-); high school math through pre-calculus. Not recommended for students with grades below B- in CHEM 1021. Department enforced corequsite: CHEM 1114. Not open to engineering students with exception of EPEN majors. Degree credit not granted for this course and CHEM 1400 or CHEN 1211.
CHEM 1114 - Laboratory in General Chemistry 1
Primary Instructor
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Spring 2019 / Summer 2022 / Summer 2023 / Summer 2024
Lab. Intended for first-semester students whose academic plans require advanced work in chemistry. Instruction in experimental techniques which coordinate with lecture topics in CHEM 1113. Department enforced prerequisites: one year high school chemistry or CHEM 1021 (min grade C-); high school math through pre-calculus. Not recommended for students with grades below B- in CHEM 1021. Department enforced corequisites: CHEM 1113 or CHEN 1201. Credit not granted for this course and CHEM 1401 or CHEM 1221.
CHEM 1133 - General Chemistry 2
Primary Instructor
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Spring 2020 / Summer 2022 / Fall 2022 / Spring 2024
Intended for second-semester students whose academic plans require advanced work in chemistry. Subjects: acid-base equilibria, buffers and titrations, thermodynamics, redox reactions, electrochemistry, transition elements and their coordination compounds, solubility/solubility equilibria, crystal field theory, kinetics, nuclear chemistry. Department enforced corequisite: CHEM 1134. Degree credit not granted for this course and CHEM 2100.
CHEM 1134 - Laboratory in General Chemistry 2
Primary Instructor
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Summer 2022 / Fall 2024
Intended for second-semester students whose academic plans require advanced work in chemistry. Instruction in experimental techniques which coordinate with lecture topics in CHEM 1133. Department enforced corequisite: CHEM 1133. Degree credit not granted for this course and CHEM 2101.
CHEM 1221 - Engineering General Chemistry Lab
Primary Instructor
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Fall 2020 / Fall 2023 / Spring 2024
Meets general chemistry laboratory requirement for engineering students. Designed to illustrate chemical concepts and introduce basic techniques in chemical measurement and synthesis. Department enforced prerequisites: one year of high school chemistry or CHEM 1021 (min. grade C-) and high school algebra; B- in CHEM 1021 recommended. Credit not granted for this course and CHEM 1114 or CHEM 1401.
CHEM 1401 - Foundations of Chemistry Lab
Primary Instructor
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Fall 2019 / Fall 2020
Coordinates with lecture topics in CHEM 1400. Intended for first-semester CHEM and BCHM majors. Emphasizes the development of hands-on practical laboratory skills, experimental design, data interpretation, problem solving and open inquiry. Department enforced prerequisites: one year high school chemistry or CHEM 1021 (minimum grad C-) and high school math through pre-calculus. Not recommended for students with grades below B- in CHEM 1021. Department enforced corequsite: CHEM 1400. Credit not granted for this course and CHEM 1114 or CHEM 1221.
