Seminars & Symposium

[5/11] THE 25TH AIMR TEA TIME TALK

The 25th AIMR Tea Time Talk

Speaker

Dr. Pierre-Antoine Geslin

(Mateis lab, INSA Lyon/CNRS 
ELyTMaX Lab at Tohoku University 
Institute for Materials Research, Tohoku University)

Title

Numerical investigation of the liquid metal dealloying process

Date

May 11 (Fri.), 2018 16:00-17:00

Venue

Combination Room, 5th floor, AIMR Main Bldg.

Abstract

Liquid metal dealloying has emerged as a promising technique to produce finely porous structures of various nature (non-noble metals, refractory metals or semi-conductors) presenting a high surface area, valuable in a numerous applications (catalysis, battery materials, sensors,...). This process consists in immersing a binary precursor alloy in a liquid metal chosen such that only one element of the precursor alloy dissolves into the metallic melt while the other element reorganizes into a porous structure. The characteristics of the resulting porous material (ligament size, surface area, connectivity) depend on both the formation mechanism occurring at the dealloying front and the subsequent coarsening behavior of the structure by surface diffusion. Using a phase-field model, we first shed light on the details of the formation mechanism. In particular, we show that the onset of the dealloying reaction can be viewed as an interfacial spinodal decomposition and that the kinetics of the process limited by diffusion of the dealloyed element in the liquid phase. In addition, we also developed a phase-field model for surface diffusion to better understand the coarsening behavior of these connected structures. In particular, we demonstrate an influence of the topological characteristics (connectivity of the ligaments) on the coarsening kinetics of the structure.

About Tea Time Talk

AIMR’s Tea Time Talk is a kind of seminar aiming to promote exchange between world’s eminent researchers and young researchers at AIMR, held in a relaxed atmosphere at AIMR’s Friday Tea Time. The following researchers from around the world have given talks at this event so far, and participants have enjoyed discussion over a cup of tea.

25th	May 11, 2018	Dr. Pierre-Antoine Geslin (Mateis lab, INSA Lyon/CNRS / ELyTMaX Lab at Tohoku University / Institute for Materials Research, Tohoku University)
24th	Apr. 27, 2018	Prof. Masaru Tsukada (AIMR, Tohoku University)
23rd	Dec. 8, 2017	Prof. Jean-Yves Cavaillé (INSA Lyon, France / ELyT MaX Lab at Tohoku University)
22nd	July 28, 2017	Prof. Nicolas Mary (INSA Lyon, France / ELyT MaX Lab at Tohoku University)
21st	July 21, 2017	Prof. Gael Sebald (INSA Lyon, France / ELyT MaX at Tohoku University)
20th	July 7, 2017	Prof. Arun Bansil (Northeastern University)
19th	June 30, 2017	Dr. Takeshi Nakanishi (AIST-Tohoku U Mathematics for Advanced Materials Open Innovation Laboratory (MathAM-OIL))
18th	June 23, 2017	Prof. Denis Arčon (Jožef Stefan Institute, Slovenia)
17th	Apr. 28, 2017	Prof. Ayumi Hirano (AIMR, Tohoku University)
16th	Nov. 29, 2016	Dr. David Guy Austing (National Research Council Canada, Canada)
15th	Sept. 30, 2016	Prof. C. Suryanarayana (University of Central Florida, U.S.A.)
14th	June 17, 2016	Prof. Tomoteru Fukumura (AIMR, Tohoku University)
13th	May 13, 2016	Prof. Jean-Yves Cavaillé (ELyT MaX (Joint Lab at Tohoku University), University of Lyon, France)
12th	June 26, 2015	Dr. B. Muralidharan (Indian Institute of Technology Bombay, India)
11th	June 27, 2014	Prof. Michael B. Santos (The University of Oklahoma, U.S.A.)
10th	Nov. 19, 2013	Dr. Pawel Hawrylak (National Research Council Canada, Canada)
9th	Oct. 1, 2013	Dr. Yuan T. Lee (Nobel laureate in Chemistry, Academia Sinica of Taiwan)
8th	June 28, 2013	Dr. Bjorn Mysen (Geophysical Laboratory, Carnegie Institution for Science, U.S.A.)
7th	Apr. 12, 2013	Prof. Yiming Li (National Chiao Tung University, Taiwan)
6th	Jan. 18, 2013	Prof. Tomasz Dietl (Polish Academy of Sciences, Poland)
5th	Aug. 31, 2012	Prof. John H. Perepezko (University of Wisconsin-Madison, U.S.A.)
4th	Aug. 17,2012	Prof. Alain Reza Yavari (Grenoble Institute of Technology, France)
3rd	Aug. 10, 2012	Prof. Alan Lindsay Greer (University of Cambridge, U.K.)
2nd	July 6, 2012	Prof. Winfried Teizer (Texas A&M University, U.S.A.)
1st	May 25, 2012	Prof. Thomas P. Russell (The University of Massachusetts Amherst, U.S.A.)

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