@FloatingScience

Separations, liquid surfaces/interfaces, graphene, soft matter, heavy elements, rare earths, and general science issues. Opinions are my own.

 Argonne, IL
anl.gov/profile/ahmet-uysal
Joined February 2015
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“Aqueous interfaces in chemical separations” is now online in @ACS_Langmuir. Challenges, opportunities & need for cross-disciplinary communication laid out. Deeply appreciate @OzgeHeinz’s invitation for this perspective. Funding: @doescience pubs.acs.org/doi/10.1021/acs…
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Investigating aqueous mineral interfaces using sum frequency generation spectroscopy Moritz Zelenka, Ellen H. G. Backus arxiv.org/abs/2607.20017 [𝚙𝚑𝚢𝚜𝚒𝚌𝚜.𝚌𝚑𝚎𝚖-𝚙𝚑]
Sum frequency generation spectroscopy can be utilized to address the challenge of studying solid-liquid interfaces under ambient pressure and with macroscopic amounts of liquid, while still retrieving molecular level information. By utilizing a non-linear optical process, this method allows to selectively measure vibrations of interfacial species. Within this chapter sum frequency generation spectroscopy is first briefly introduced and then comprehensively evaluated as an investigative tool for solid-liquid interfaces, with mineral-water interfaces as model system. Additionally, it is explained how the actual probing depth of this method depends on both the experimental setup and the properties of the investigated system, such as surface charges.

ALT Sum frequency generation spectroscopy can be utilized to address the challenge of studying solid-liquid interfaces under ambient pressure and with macroscopic amounts of liquid, while still retrieving molecular level information. By utilizing a non-linear optical process, this method allows to selectively measure vibrations of interfacial species. Within this chapter sum frequency generation spectroscopy is first briefly introduced and then comprehensively evaluated as an investigative tool for solid-liquid interfaces, with mineral-water interfaces as model system. Additionally, it is explained how the actual probing depth of this method depends on both the experimental setup and the properties of the investigated system, such as surface charges.

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Ken Lo@bhkenloJun 22
Reactions of U(DMSO)8(ClO4)4 with Terpyridine Yield Dimeric Hydrolysis Products and Induce C–C Coupling | Inorganic Chemistry pubs.acs.org/doi/10.1021/acs… Mikeska, Wilson, and Vallet @InorgChem #uranium #IV #terpyridine #CCcoupling
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The conversation is underway at #ArgonneOutLoud. Argonne experts Steven DelaCruz, Nora Shaheen, and Xuan Zhang share how advances in nuclear science, materials research and national security help shape the future of energy and technology -Watch live: bit.ly/4wj8lBF
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Tackling today’s toughest challenges in chemistry and materials science demands a new approach to research. Meet Argonne’s RAPID-200, where robotics, AI and advanced tools are accelerating discovery in energy storage, quantum, and beyond. Learn more - bit.ly/4wsG644
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Shout out to Ecem for a fantastic 3-month seminar presentation yesterday on “Mechanochemical Synthesis of Rare Earth Compounds and Their Application in Reactivity-Driven Separations”!
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Argonne National Lab@argonneMay 4
As a chemist and group leader in Argonne’s Materials Science division, Rajeev Surendran Assary is applying artificial intelligence to accelerate the discovery of advanced energy materials - bit.ly/4erj3QM
Rajeev Surendran Assary pictured inside of an Argonne lab, wearing PPE.

ALT Rajeev Surendran Assary pictured inside of an Argonne lab, wearing PPE.

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doi.org/10.1063/5.0317085

The vibrational relaxation of a charged solute probes the vibrational density of states at oxide/...

The vibrational lifetime of solute molecules is predicted to be slower at interfaces; however, ultrafast measurements show that this behavior can vary dramatica

pubs.aip.org
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For high-concentration cornstarch and water mixtures, the impact dynamics are liquidlike at short times but become solidlike at later times Letter: go.aps.org/4vgs0lQ Synopsis: go.aps.org/4sDzvRv
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Argonne National Lab@argonneApr 5
Argonne's Ilke Arslan was named a 2026 @Materials_MRS Fellow for her contributions to materials research. An expert in ultrafast electron microscopy, she studies materials on nanosecond timescales, supporting advances in microelectronics, quantum & more - bit.ly/4lBBrHX
Professional portrait of Ilke Arslan, wearing a black shirt, standing outdoors on Argonne’s campus.

ALT Professional portrait of Ilke Arslan, wearing a black shirt, standing outdoors on Argonne’s campus.

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Krupa Ramasesha@KRamaseshaFeb 26
Our Featured Article is now on the cover of @JPhysChem A @ACSPublications. Check out our #MyACSCover, and read our article on pressure-tuned ultrafast vibrational dynamics in molecular materials at pubs.acs.org/doi/10.1021/acs…
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From heavy element chemistry to legacy waste cleanup, Julia Neumann is driving real-world advances that support safer nuclear energy - bit.ly/3ZfqQsc #WeAreArgonne
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Actinides in alkaline solution keep showing us new chemistry! Accessibility and Reactivity of Pentavalent Plutonium under Alkaline Conditions | Journal of the American Chemical Society pubs.acs.org/doi/10.1021/jac…

Accessibility and Reactivity of Pentavalent Plutonium under Alkaline Conditions

Abstract. Plutonium exhibits a particularly complex and rich aqueous chemistry due to a dynamic redox equilibrium that can result in the coexistence of fou

pubs.acs.org
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Understanding solution speciation of uranyl is critical for advancing chemical separations and sensing. In our latest work, we showed that N(CH₃)₄⁺ enhances uranyl–nitrate complexation, forming higher-order complexes vs. Na⁺/Li⁺/NH₄⁺ | RSC Advances pubs.rsc.org/en/content/arti…

Spectroscopic investigation of cation effects in U(vi)-NO3− complexation in aqueous solutions

Understanding and manipulating uranyl speciation in aqueous solutions is critical for advancing chemical separation, sensing, and understanding environment

pubs.rsc.org
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On the cover of this week's issue: "Reactions of Np(VI) and Pu(VI) with Phenanthroline Result in Bending the [NpVIO2]2+ Unit and a Reduced Pu(V) Species" Read it here 🔗 go.acs.org/dd1
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As demand for #minerals continues to rise, the @USGS's Mineral Resources Program (MRP) will be increasingly relied upon to help guide decision-makers. Read our new report on the MRP and how it can be utilized to help meet U.S. mineral resource needs: ow.ly/a3UM50WXJUl
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HESS Group@HESS_Argonne5 Sep 2025
We used small-angle X-ray scattering and molecular dynamics simulations to investigate organic phase structural changes upon contact with water in a model ternary system of water/alkane/extractant | The Journal of Physical Chemistry B pubs.acs.org/doi/10.1021/acs…

Extracted Water Induces Concentration Fluctuations in Model Ternary Liquid–Liquid Extraction System

Abstract. Organic phase aggregation and phase splitting are two important (and connected) phenomena in liquid–liquid extraction of metal ions. Previously,

pubs.acs.org
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HESS Group@HESS_Argonne5 Sep 2025
Here at Argonne, we synthesize compounds both down the alkali metal group and across the actinide period. Check out a comprehensive series of alkali tris(acetato)actinyl(VI) (U, Np, Pu) compounds | European Journal of Inorganic Chemistry chemistry-europe.onlinelibra…

Structural and Spectroscopic Trends in Alkali Tris(Acetato)Actinyl(VI) Complexes

Alkali tris(acetato) actinyl(VI) complexes of different actinyls and identical alkali metals are mostly isostructural, showing a redshift in the symmetric actinyl stretch across the actinide series....

chemistry-europe.onlinelibrary.wiley.com
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HESS Group@HESS_Argonne5 Sep 2025
A comprehensive study on uranyl luminescence quenching by various alkali metal and quaternary ammonium cations was investigated and is available now at Physical Chemistry Chemical Physics pubs.rsc.org/en/content/arti…

Uranyl fluorescence in acidic solution: quenching effects by tetramethylammonium (TMA+)†

The quenching of uranyl luminescence by various cation species was studied in aqueous media at low pH. Solutions with different nitrate salts, held at cons

pubs.rsc.org
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#ChemPhysChem Using synchrotron X-rays & sum frequency generation spectroscopy, @HESS_Argonne group demonstrate how trivalent rare earths enhance surface deprotonation and drive interfacial water ordering, with insights into REE separations #openaccess 🔓 onlinelibrary.wiley.com/doi/…

Trivalent Rare Earth Adsorption at Phosphonic Acid Monolayers

This study explores neodymium (Nd) adsorption on Langmuir monolayers of octadecylphosphonic acid (ODPA) at the air/water interface. Using sum frequency generation spectroscopy and X-ray fluorescence...

chemistry-europe.onlinelibrary.wiley.com
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Reactions of Np(VI) and Pu(VI) with Phenanthroline Result in Bending the [NpVIO2]2+ Unit and a Reduced Pu(V) Species | Journal of the American Chemical Society pubs.acs.org/doi/10.1021/jac…

Reactions of Np(VI) and Pu(VI) with Phenanthroline Result in Bending the [NpVIO2]2+ Unit and a...

Abstract. Despite decades of actinyl chemistry, genuinely bent actinyl structures remain rare beyond uranium. We report the first crystallographic characte

pubs.acs.org
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