Experience

The American Ceramic Society

• United States
• Non-profit Organizations
• 1 - 100 Employee

• Organizer and Chair of Symposiums for International Conferences

  • Jun 2020 - Present

  As chair, I managed a group of 3 scientists, including myself to organize a symposium "Progressive Solutions to Improve Corrosion Resistance of Nuclear Waste Storage Materials (NWSM), at Materials Science and Technology (MS&T) Conference MS&T2021, MS&T2022 and MS&T2023. I wrote proposals for sponsorship, which was initially granted from the ACerS Glass and Optical Materials Division (GOMD), Chair Prof. Jincheng Du (Jincheng.Du@unt.edu), University of North Texas. I invited, revised and accepted abstracts for presentations, increasing the presentations and attendees from 6, respectively 40 in 2021 to 9, respectively 70 in 2022. Through their presentations, outstanding scientists included research on multiple aspects: processing, characterization, modeling, experimental and solutions for long-term durability of NWSM at the repository, focusing on its main issue: the NWSM corrosion in the presence of underground water, which could lead to release radionuclides in environment. Significant advancement was achieved by presenting: - geopolymers to host nuclear waste - processed with about zero CO2 footprint - Molecular Dynamic (MD) simulations and experimental work to understand aqueous glass corrosion and its effects on glass structure, stability and mechanical properties - Machine Learning (ML) to predict NWG long term stability, glasses mechanical properties, Artificial Intelligence (AI) and ML to design new glass compositions - Models and experimental work to understand the stress corrosion cracking (scc) and its mitigation for steel canisters and to study the impact of irradiation on the aqueous corroded NWG and on steel canisters - thermodynamic predictions of stable phases to occur when NWG are exposed to underground water -I adapted, for the first time, from another field, a presentation on neutron diffraction hydrogen radiography, at micron level, of the aqueous corroded NWG Show less



Stevens Institute of Technology

• United States
• Higher Education
• 700 & Above Employee

• Scientific Researcher

  • May 2010 - Present

  - Wrote 4 highly influential scientific articles, 1 book and 1 research proposal, together with a few other scientific works in the glass science- Focused on alkali corrosion of silicate glass to beneficiate the glass and ceramic industry and influenced the scientific community through mentorship- Researched boro-silicate glass to store nuclear waste to prevent radionuclides escapes into waters in the environment at the underground repository- List of my work: "Mixed Alkali Effect Explained on How it Affects Materials Properties"-M.Jordache and H.Du (2021) Manuscript "An Application of Mixed Alkali Effect to Improve a Material Property"-M. Jordache and H. Du (2021) Manuscript "Mixed Alkali Effect in Alkali Corrosion of Silicon Nitride"-M. Jordache and H. Du (2021) Manuscript "Study to Restrict Radioactive Cs Escapes from High-Level Nuclear Waste (HLW) to Clean Up Nuclear Waste" Madeleine Jordache (2019) "High-Temperature Alkali Corrosion of Kyocera SN282 Silicon Nitride" by Madeleine K. Jordache and Henry Du in Corrosion Science Vol. 91 (2015) 68-74, http://dx.doi.org/10.1016/j.corsci.2014.10.050 - Fluent in English, French - Named Judge for Undergraduate Students Poster Contest held at the International Conference Materials Science and Technology MS&T18 organized by The American Ceramic Society in 2018 - ASTM Award For combined Excellent Research Skills and High Academic Performance Show less

• Carried National Science Foundation (NSF) project

  • Sep 2001 - May 2010

  I was part of a team and in charge to carry this NSF project. This ambitious project required strong team-working skills and very high scientific and engineering ability. I worked well as a part of the team, contributed in-group discussions and took initiative to set myself tasks when the next stage of the project was not clear. Given the role of executing this project I was responsible for setting goals and ensuring all the experimental steps and specimens/materials characterization were realized in time and met the specifications of the project.Work published:"Oxidation behavior of silicon nitride sintered with Lu2O3 additive" M.K. Jordache and H. Du J. Mater. Sci. Vol.41 (2006) Nr. 21 pg. 7040-7044 DOI 10.1007/s10853-006-0949-z Show less

• Student Research Assistant

  • Sep 2001 - Sep 2005

  I was responsible to conduct research on high temperature ceramic and semiconductor oxidation in dry oxygen and in environment contaminated with metals containing species. I precalculated and carried out experiments on high-temperature oxidation of Si3N4 and of Si in environment of pure O2 and in ambient of O2 contaminated with very low concentration of alkali containing species.→Calculated kinetic parameters for oxidation and corrosion of non-oxide ceramic: determined oxidation rate constant at each T based on SEM measurements of oxide thickness evolution with time; from the slope of linear Arrhenius plot of rate constants with T calculated the activation energy Ea for ceramic oxidation→Through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) plan-view and cross-section, and X-ray Diffraction (XRD) phase analysis, paired with the value found for activation energy Ea, determined the oxidation mechanism of Kyocera SN282 Si3N4→Through kinetic analysis on rate constant coupled with SEM, EDX and XRD analysis assessed aggravated Si3N4 oxidation under alkali contamination→Correlated structure-properties relationship between corroded layers and ceramic corrosion resistance→Pre calculated successfully the mixed alkali (MA) experiments based on the surface of evaporation of the Cs salts from crucibles and the accurately measured temperature gradient in the evaporation furnace.→Carried out successfully experiments with Cs containing species in environment, Cs being extremely reactive →Performed successfully the challenging MAE experiments→SEM oxides characterization, plan view, cross-section thicknesses, EDX elemental mapping: lateral chemical elemental distribution and oxide and ceramic cross-section.→Interpreted results, correlating structure properties relationships → 4 oral presentations at conferences 2002-2004. "Additive-/Alkali-Dependent Corrosion of Si3N4", M. Jordache and H. Du, Paper AM-BSD-24-2004 Show less



Lucent Technologies Bell Labs innovations

• Telecommunications
• 1 - 100 Employee

• Research Internship

  • May 2001 - Aug 2001

  I was part of a team and in charge to research a new developed product, to understand microstructure changes of thin metal film deposited on silicon micromechanical structure from deposition to post anneal and thin film stress, which I pursued and understood the microstructure changes associated with relieving intrinsic tensile stress in the metal thin film. I worked to fast industry pace, showing business acumen and professionalism, contributing to the teamwork my communication and organization skills, remaining calm under pressure. I reported in time, prepared presentations required on a very short notice. I understood the voids formation in the metal film deposited on silicon were associated with relieving the intrinsic tensile stress in the metal film, assessing: - grain growth did not take place at 250C due to lack of enough thermal activation - voids were not generated due to deposition conditions, since they appeared on the metal films on Si micromechanical structures but not on metal films deposited on much thicker Si substrates - voids are not created as a result of diffusion of metal into Si, since there are voids on as-deposited samples, but no signs of diffusion under the as-deposited film - voids most probably are generated to relieve the intrinsic tensile stress in the metal thin film I developed a set of analysis tools: HRSEM to investigate the surface and cross-section of thin film, check for columnar structure, grain size and percentage and distribution of voids in the thin film, assess on any metal diffusion from coating into the substrate (as spikes of square pyramidal shapes upon metal removal from Si), AFM for 3D profile of thin film surface, XRD to check for texture of the metallic film and rocking curve to evaluate metal subgrain tilt and thermal experiments to understand stress evolution during and residual stress after thermal cycling, measuring in Interferometer bending of substrate caused by the deposited thin film. Show less



New York University - Polytechnic School of Engineering

• United States
• Higher Education
• 1 - 100 Employee

• Research Fellow

  • Jan 1996 - Aug 1999

  Through collaboration with my team, I conducted research on grain growth kinetics of electrodeposited Nano-Nickel by means of isothermal and isochronal annealing and transmission electron microscopy (TEM). I determined the kinetic parameters: the time exponent 1/n from the plot of grain size difference versus annealing time, according to the relation: ln(D-D0)=1/n lnt, and the activation energy for grain growth Ea from the plot of the Arrhenius relation of the ln(grain growth rate) -evaluated for 2 minutes growth- versus 1/T. By means of TEM Bright Field and Dark Field Imaging and microhardness measurements, I characterized the as-received Nano-Nickel and its changes upon annealing, imaging its grain size changes, structural defects within the grains such as stacking faults, twinning and dislocations, and associated changes in microhardness. Through TEM diffraction pattern of nanocrystalline nickel I determined the double texture of the as-received Nano structured Nickel. I characterized the nano-structured Nickel through X-ray Diffraction. The experiments I conducted were careful, and accurate, for perfectly reproducible results, obtaining the same results in two different experimental ways. Paper published: M.C. Iordache, H. Whang, Z. Jiao and Z.M. Wang, "Grain Growth Kinetics for Nanostructured Nickel", Nanostructured Materials, Vol.11, No.8, pp.1343-1349, 1999 (this paper has 97 citations) Show less