Advanced Functional and Structural Thin Films and Coatings: Poster Session
Sponsored by: TMS Functional Materials Division, TMS: Thin Films and Interfaces Committee
Program Organizers: Adele Carrado, University of Strasbourg; Ramana Chintalapalle, University of Texas at El Paso; Gerald Ferblantier, University of Strasbourg - IUT LP / ICube Laboratory - CNRS; Nancy Michael, University of Texas at Arlington; Karine Mougin, Cnrs, Is2m; Heinz Palkowski, Clausthal University of Technology; Nuggehalli Ravindra, New Jersey Institute of Technology; Vikas Tomar, Purdue University
Wednesday 5:30 PM
March 17, 2021
Room: RM 19
Location: TMS2021 Virtual
Session Chair: Ramana Chintalapalle , UTEP EL PASO
A Study on PMMA-copolymers Grafted onto Ti Using Advanced Chemistry Approach
: Flavien Mouillard; Patrick Masson1; Genevieve Pourroy1; Adele Carrado1; 1IPCMS - CNRS
A composite material titanium (Ti)/ poly methyl methacrylate (PMMA)-co- n-butyl methacrylate (PBMA) (PMMA-co-PBMA) was developed with “grafting from” method to reduce stress shielding. A 3-step method was developed: (i) an alkali treatment of Ti surface, (ii) its functionalization with a phosphonic acid-containing polymerization initiator and (iii) controlled radical polymerization of MMA and BMA from this initiator. This study deals with the characterization of the cut grafted copolymer without its degradation. For this, a new photocleavable initiator was designed. The grafting density, molecular weight and also melting point of PMMA-co-PBMApolymer brushes grafted on Ti were determined.
Atomic Layer Deposition & Atomic Layer Etching – An Overview of Selective Processes: Oktay Gokce1; Nuggehalli Ravindra1; Samiha Hossain1; 1New Jersey Institute of Technology
The continued evolution in nanoelectronics and nanophotonics has been made possible by the recent developments in Atomic Layer Deposition and Atomic Layer Etching. While uniform deposition of conformal films with controllable thickness is a key feature of Atomic Layer Deposition, Atomic Layer Etching offers the advantages of controlled removal of chemically modified areas. Various case studies of the applications of these technologies in dielectrics, metals and diffusion barriers will be discussed. Advantages, disadvantages, future directions and opportunities for further development will be highlighted.
Calcium-phosphate Plasma Electrolytic Oxidation (PEO) Coatings on AZ31 Mg Alloy: Effects of Different Tricalcium Phosphate (TCP) Concentrations: Navid Attarzadeh1; Amir Hossein Kazemi2; Maryam Molaei2; Arash Fattah-alhosseini2; 1University of Texas at El Paso; 2Bu-Ali Sina University
Mg alloys are highly sought-after implant materials due to their biocompatibility. However, inadequate corrosion performance hampers their applications in human body. For this study, we prepared calcium-phosphate PEO coatings on AZ31 Mg alloys in a solution containing tricalcium phosphate Ca3(PO4)2 (TCP) salt in 1, 2, 3, and 4 g/l concentrations. We studied surface morphology of coatings using FE-SEM and examined the effect of elemental compositions on corrosion performance. Coatings demonstrated a porous morphology and were composed of MgO, Ca3(PO4)2, and TCP phases. We found increasing TCP content not only increased thickness and compactness of coatings, it also modified morphology of coatings including producing narrower pores and smaller cracks. Corrosion performance was evaluated using impedance spectroscopy (EIS) after immersion in a simulated body fluid for two intervals of 1 h and 7 days. The coating with 4 g/l TCP revealed greater resistance as the appetite formation was enhanced on the coating.
Studying Effects of Frequency on ZrTiO4/ZrO2 Nanocomposite Coatings on Ti–6Al–4V Alloys Produced by Plasma Electrolytic oxidation (PEO) Process: Navid Attarzadeh1; Elham Nikoomanzari2; Kazem Babaei2; Arash Fattah-alhosseini2; 1University of Texas at El Paso; 2Bu-Ali Sina University
In the present work, effects of three frequencies of 100, 1000 and 2000 Hz during the PEO method on the properties of ceramic coatings were evaluated. Coatings were produced on Ti-6Al-4V alloys using a solution containing 12 g/l Na3PO4 and 3 g/l nanoparticles of ZrO2. For this purpose, the microstructure, chemical compositions, wettability, surface roughness and corrosion resistance of coatings were studied. X-ray diffraction analysis (XRD) showed that all coatings were composed of ZrO2 and ZrTiO4 phases. Microstructural studies using scanning electron microscopy (SEM) indicated that the size of porosity, thickness and surface roughness of coatings decreased by rising frequencies. We studied corrosion performance of coatings at a 3.5% NaCl solution using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. We finally understood by increasing the wetting angle of the surface through producing coatings at higher frequencies, corrosion resistance could be modified.
Temperature Dependence of Energy Gap in Semiconductors – Influence on Solar Cell Performance: Leqi Lin1; Rayan Daroowalla2; Ritvik Rangaraju3; Nuggehalli Ravindra1; 1New Jersey Institute of Technology; 2University of Maryland; 3West Windsor-Plainsboro High School South
A detailed analysis of the temperature dependence of the energy gap in semiconductors is presented. Its influence on solar cell performance is examined for various semiconductor candidates. In particular, semiconductors belonging to group IV, III-V, II-VI, as well as CIGS & pervoskites are considered. The potential implications of this study on some tandem solar cells are examined. Applications of this study in integration schemes of renewable energy sources are discussed.