Researcher Information

SHINOZAKI Ayako

Assistant Professor

High-pressure and high-temperature science of light elements and investigation of deep Earth interior.

Department of Earth and Planetary Sciences, Earth and Planetary System Science

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Theme

Behavior of carbon and nitrogen in the deep Earth and planetary interior. Phosphorus as a key to the origin of life.

FieldHigh-pressure science, Mineralogy, Geochemistry
KeywordInterior of the Earth and icy satellites, Subducting slab, Deep carbon, C-O-H-N fluids, Aromatic compounds/Aliphatic hydrocarbons, Chemical evolution of phosphus compounds, High-pressure and high-temperature experiments, Diamond anvil cells

Introduction of Research

I have been investigating behavior of carbon, nitrogen and hydrogen in the deep Earth and planetary interior using high-pressure and high-temperature experiments. Especially I’m studying about chemical evolution of organics such as aromatic compounds and amino acids.

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diamond anvil cells

Representative Achievements

Effect of Pressure on the Thermal Cracking and Polymerization of Pentacosane (n-C25), an n-Alkane, 
A. Shinozaki, ACS Earth and Space Chemistry2023, 7, 69-76
Polymerization mechanism of nitrogen-containing heteroaromatic compound under high-pressure and high-temperature conditions,
A. Shinozaki, K. Mimura, and T. Nishida, G.D. Cody, Journal of Physical Chemistry A, 2021, 125, 376-386
Behavior of intermolecular interactions in α-glycine under high pressure,
A. Shinozaki, K. Komatsu, H. Kagi, C. Fujimoto, S. Machida, A. Sano-Furukawa, and T. Hattori, Journal of Chemical Physics, 2018, 148, 044507
Stability and partial oligomerization of naphthalene under high pressure at room temperature,
A. Shinozaki, K. Mimura, T. Nishida, T. Inoue, S. Nakano, H. Kagi, Chemical Physics Letters, 2016, 662, 263-267
Preferential dissolution of SiO2 from enstatite to H2 fluid under high pressure and temperature,
A. Shinozaki, H. Kagi, H. Hirai, H. Ohfuji, T. Okada, S. Nakano, T. Yagi, Physics and Chemistry of Minerals, 2016, 43, 277-285,

Department of Earth and Planetary Sciences, Earth and Planetary System Science

SHINOZAKI Ayako

Assistant Professor

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What is the research theme that you are currently focusing on?

I have recently begun the research on the impact of phosphorus on the origins of life. I have been collaborating with researchers in astronomy, planetary science, chemistry, and biology whom I met at a networking event for young researchers, with the goal of clarifying “How and why life on Earth began to use phosphorus, which has a low abundance in the solar system.” We organized workshops on phosphorus with the origins of life.

I’m conducting laboratory experiments that simulate early Earth environments to elucidate the process of the chemical evolution of phosphorus from inorganic minerals to organophosphorus compounds, which are building blocks for life. Furthermore, to verify the existence of phosphorus in other planets, I am experimentally investigating the chemical evolution of phosphorus in the oceans of icy bodies, where the possibility of life has been debated.

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What do you usually do when your research work gets stuck?

The high-pressure and high-temperature experiments I am involved in require me to create some of the parts, such as gaskets and metallic capsules, by myself. As I work on these tasks, which also serve as preparation for the experiments, I find it to be a welcome change of pace, and it often leads to the emergence of good ideas. Alternatively, I take a walk around the Hokkaido University campus as a change of pace, temporarily forgetting about tasks and refreshing my mind.

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Please tell us what you think is good about your lab.

The diamond anvil cell (DAC) we use for high-pressure and high-temperature experiments in our laboratory is a small device that can fit in your hand. Despite being manually pressurized by twisting a screw with human hands, it could generate high pressures equivalent to several million gigapascals, corresponding the pressures of the Earth’s interior. DAC allows us to observe phenomena such as the growth of crystals under high pressure conditions through diamonds used for compression. Utilizing visible light and X-rays, we can conduct in situ observations of crystal structures and behavior of molecules under high-pressure conditions.