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Kunioshi Lab
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The lab uses quantum chemical calculations to clarify chemical reactions that occur at the boundary between solids and gases.
AboutAbout the lab
Tracing the path of a reaction by calculation.
The Kunioshi Lab uses quantum chemical calculations to clarify the mechanisms of chemical reactions at solid-gas interfaces.
Its current focus is the process by which single crystals of semiconductor silicon grow in chemical vapor deposition (CVD).
The lab analyzes a series of reactions, including reactions among gases, adsorption of gas molecules onto solid surfaces, and reactions in which chlorine leaves the surface.
In addition to determining the reaction kinetics and rate constants of each step in order to understand and optimize the whole process, the lab is also studying the relationship between language and culture in the words used in science and engineering lectures.
Key terms
- Quantum chemical calculation
- A method that calculates the behavior of electrons based on quantum mechanics to investigate the properties and reactions of molecules
- Chemical vapor deposition (CVD)
- A method in which source gases react to build up a thin film or crystal on a solid surface
- Reaction rate constant
- A value that indicates how fast a given chemical reaction proceeds
ResearchResearch themes
The Kunioshi Lab analyzes the growth process of silicon single crystals by chemical vapor deposition using quantum chemical calculations, breaking it down into elementary reactions. It also explores the possibility that carbon dioxide adsorbed on solid surfaces reacts with other molecules to form organic molecules and other products. In addition, the lab studies the relationship between language and culture in science and engineering lectures by analyzing a corpus of lecture transcripts.
*Illustrative imageScience education, language, and culture
Transcripts of lectures given in English at US universities and in Japanese at Japanese universities are published online as corpora (OnCAL / OnCAL.jp). By analyzing these corpora, the lab investigates how cultural background appears in the language that science and engineering faculty use in the classroom.
*Illustrative imageReactions of carbon dioxide on silicon sludge surfaces
When large silicon single crystals are sliced into thin wafers, a large amount of cutting waste called silicon sludge is produced. Because it derives from single crystals, this material may have some useful function, yet it is currently discarded. The lab analyzes how carbon dioxide adsorbs and reacts on its surface.
*Illustrative imageEpitaxial growth of silicon crystals
The mechanism by which the silicon crystal surface grows inside a chemical vapor deposition (CVD) furnace is used in industry but is still not understood. Using computational chemistry methods, the lab analyzes in detail a series of reactions, such as the adsorption of SiCl2 generated from a mixture of trichlorosilane and hydrogen and the desorption of chlorine from the surface.
*Illustrative imageMechanism of phospholipid calcification
Phospholipids, the molecules that make up cell membranes, have a property called calcification that promotes the growth of bone-like materials. The lab aims to clarify the chemical reactions through which calcification proceeds by using quantum chemical calculations, and to apply the results to designing molecules that produce bone-like materials faster.
MembersFaculty
- ProfessorNilson Kunioshi
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Polycrystalline silicon rod” Warut Roonguthai / CC BY-SA 3.0 (cropped)
- Science education, language, and culture: “Empty Lecture Room Interior” Paul The Writer / CC0 (cropped)
- Reactions of carbon dioxide on silicon sludge surfaces: “Drill bit with swarf” Marco Bernardini / CC BY-SA 3.0 (cropped)
- Epitaxial growth of silicon crystals: “Silicon wafer close view” Le hollandais volant / CC BY 4.0 (cropped)
- Mechanism of phospholipid calcification: “Tham Lot (cave), Stalactites, Ceiling, Thailand” Vyacheslav Argenberg / CC BY 4.0 (cropped)
- Related lab (廣本研究室): “CSIRO ScienceImage 2893 Crystalised magnesium” Mark Fergus, CSIRO / CC BY 3.0 (cropped)
- Related lab (川岸研究室): “Jet engine turbine” Dtom / Public domain (cropped)
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