Ana C. Morales

Enhanced Light Absorption and Elevated Viscosity of Atmospheric Brown Carbon through Evaporation of Volatile Components

Diego Calderon‐Arrieta, Ana C. Morales, Anusha P. S. Hettiyadura, Taylor M. Estock et autres

Samples of brown carbon (BrC) material were collected from smoke emissions originating from wood pyrolysis experiments, serving as a proxy for BrC representative of biomass burning emissions. The acquired samples, referred to as “pyrolysis oil (PO 1 ),” underwent subsequent processing by …

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Multi-modal chemical characterization of highly viscous submicrometer organic particles

Ana C. Morales, Brianna N. Peterson, Steven Sharpe, Shelby M. Huston et autres

Distinguishing highly viscous organic particles within complex mixtures of atmospheric aerosol and accurate descriptions of their composition, size distributions, and mixing states are challenges at the forefront of aerosol measurement science and technology. Here, we present results obtained from complementary single-particle measurement …

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Healing in Our Nepantla Third Space

Sarah L. Ramos, Ana C. Morales

Through this chapter, the authors share their testimonios as Latina scholars who have experienced attempts of epistemicide at Hispanic-Serving Institutions (HSIs) in the borderlands region of the United States. The authors reflect on the challenges they faced as students from the margins …

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Volatility Measurements of Individual Components in Organic Aerosol Mixtures Using Temperature-Programmed Desorption–Direct Analysis in Real Time–High Resolution Mass Spectrometry

Christopher P. West, Yun-Jung Hsu, Killian T. MacFeely, Shelby M. Huston et autres

Atmospheric organic aerosols (OA) have profound effects on air quality, visibility, and radiative forcing of climate. Quantitative assessment of gas–particle equilibrium of OA components is critical to understand formation, growth, distribution, and evolution of OA in the atmosphere. This study presents a …

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Molecular and Structural Characterization of Isomeric Compounds in Atmospheric Organic Aerosol Using Ion Mobility-Mass Spectrometry

Christopher P. West, Daniela Mesa Sanchez, Ana C. Morales, Yun-Jung Hsu et autres

Secondary organic aerosol (SOA) formed through multiphase atmospheric chemistry makes up a large fraction of airborne particles. The chemical composition and molecular structures of SOA constituents vary between different emission sources and aging processes in the atmosphere, which complicates their identification. In …

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Diversity of organic components in airborne waste discharged from sewer pipe repairs

Ana C. Morales, Christopher P. West, Brianna N. Peterson, Yoorae Noh et autres

Air-discharged waste from commonly used trenchless technologies of sewer pipe repairs is an emerging and poorly characterized source of urban pollution.

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Chemical characterization of microplastic particles formed in airborne waste discharged from sewer pipe repairs

Brianna N. Peterson, Ana C. Morales, Jay M. Tomlin, Carrie G. W. Gorman et autres

Microplastic particles are of increasing environmental concern due to the widespread uncontrolled degradation of various commercial products made of plastic and their associated waste disposal. Recently, common technology used to repair sewer pipes was reported as one of the emission sources of …

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Atmospheric emission of nanoplastics from sewer pipe repairs

Ana C. Morales, Jay M. Tomlin, Christopher P. West, Felipe A. Rivera-Adorno et autres

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Enthalpies of formation and standard entropies for some potassium Tutton salts

Ana C. Morales, N. Cooper, Barbara A. Reisner, Thomas Carroll DeVore

Differential scanning calorimetry (DSC) was used to measure the enthalpies of reaction for the dehydration of the potassium Tutton salts, K2M(SO4)2 . 6 H2O with M = Mg, Co, Ni, Cu and Zn. The values determined ranged from 335 kJ mol−1 for …

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Molecular investigation of the multi-phase photochemistry of Fe( iii )–citrate in aqueous solution

Christopher P. West, Ana C. Morales, Jackson Ryan, Maria V. Misovich et autres

-citrate photochemistry and report on the formation of previously unexplored colloidal reaction products, which may contribute to atmospheric and terrestrial light-absorbing materials in aquatic environments.

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Optical Properties of Secondary Organic Aerosol Produced by Photooxidation of Naphthalene under NOx Condition

Quanfu He, Chunlin Li, Kyla Siemens, Ana C. Morales et autres

) produced under higher NOx conditions contribute significantly to the light absorption of the SOA. The imaginary part of the RI linearly increases with the NOx/VOCs ratio due to the formation of nitroaromatic compounds. As a function of aging, the imaginary RI …

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Molecular Analysis of Secondary Brown Carbon Produced from the Photooxidation of Naphthalene

Kyla Siemens, Ana C. Morales, Quanfu He, Chunlin Li et autres

We investigate the chemical composition of organic light-absorbing components, also known as brown carbon (BrC) chromophores, formed in a proxy of anthropogenic secondary organic aerosol generated from the photooxidation of naphthalene ( naph -SOA) in the absence and presence of NO x …

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