Search Results - jagannathan+rajagopalan

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Nanotwinned Ni Films with High Strength and Ductility
Background Metallic films are commonly used as interconnects in semiconductor devices, flexible electronic devices, and micro-electronic-mechanical systems (MEMS). These applications typically require good mechanical (e.g., high strength) and electrical (e.g., low resistivity) properties. Nanocrystalline or nanolaminate films are commonly used, and...
Published: 5/4/2023   |   Inventor(s): Jagannathan Rajagopalan, Rohit Berlia
Keywords(s):  
Category(s): Physical Science, Manufacturing/Construction/Mechanical, Semiconductors, Materials & Processes, Semiconductor Devices, Energy & Power, Advanced Materials/Nanotechnology
Thermally Stable Metallic Glass Films via Steep Compositional Gradients
Background Metallic glass (amorphous) films have superior hardness, wear, and corrosion resistance as well as lower roughness compared to crystalline metallic films. These superior properties arise because of the lack of crystal defects and grain boundaries in metallic glass films. Metallic glass films have numerous applications in biomedical devices,...
Published: 5/4/2023   |   Inventor(s): Jagannathan Rajagopalan, Rohit Berlia
Keywords(s):  
Category(s): Physical Science, Manufacturing/Construction/Mechanical, Advanced Materials/Nanotechnology, Semiconductors, Materials & Processes
Low-Temperature Synthesis of Single-Crystal-Like NiAl for Interconnect Applications
Background Conventional copper (Cu) interconnects in integrated circuits show significant increases in line resistivity when linewidths decrease below 10 nm. This is due to two reasons: First, scattering of electrons at the interfaces becomes predominant since the linewidth is considerably smaller than the electron mean free path (EMFP) in Cu. Second,...
Published: 2/23/2023   |   Inventor(s): Jagannathan Rajagopalan
Keywords(s):  
Category(s): Manufacturing/Construction/Mechanical, Advanced Materials/Nanotechnology, Physical Science
Epitaxial Growth of NiTi Films on Single-Crystal Silicon Substrates Using Seed Layers
Background Nitinol (NiTi) is a nickel titanium alloy that has shape memory features, and can recover its initial shape after deformation upon heating. NiTi has a large recoverable strain and high work output, making NiTi films an ideal choice for sensors and actuators in MEMS devices. However, the thermal shape memory effect in NiTi is suppressed when...
Published: 2/23/2023   |   Inventor(s): Jagannathan Rajagopalan, Rohit Berlia
Keywords(s):  
Category(s): Physical Science, Manufacturing/Construction/Mechanical, Advanced Materials/Nanotechnology
Low-Temperature Synthesis of Thin Films with Tailored Grain Size, Texture, and Phase Composition
Background Metallic films have a broad range of applications in electronics, optoelectronics, plasmonics, catalysis, and MEMS sensors and actuators. In many of these applications it is highly desirable to control the microstructure (size and spatial distribution of grains, texture, and phase composition) of the films since the microstructure largely...
Published: 2/23/2023   |   Inventor(s): Jagannathan Rajagopalan, Paul Rasmussen
Keywords(s):  
Category(s): Physical Science, Advanced Materials/Nanotechnology, Manufacturing/Construction/Mechanical, Semiconductors, Materials & Processes
Refractory High-Entropy Alloy (RHEA) Protective Coatings with Ultra-Low Density, High Strength, Large Deformability, and Low Thermal Conductivity
Background Thermal barrier coatings (TBCs) are used to protect structural alloys in extreme (temperature/stress/radiation) environments (e.g., space reentry/hypersonic vehicles, aero turbines). Porous ceramics are often used as the topcoat of TBCs because of their high strength and melting point, and low thermal conductivity. However, ceramic topcoats...
Published: 2/23/2023   |   Inventor(s): Jagannathan Rajagopalan
Keywords(s):  
Category(s): Advanced Materials/Nanotechnology, Manufacturing/Construction/Mechanical, Physical Science
Late First-Row Transition Metal Hydrogenation and Hydrosilylation Catalysts
The processes of Hydrosilylation or Hydrogenation are widely used in the manufacturing of silicone-based materials and as a precursor in pharmaceuticals. These materials include coatings, adhesives, sealants, and cured rubbers. These processes rely on the use of metal catalysts. Unfortunately, these catalysts are relatively toxic, rare, and are very...
Published: 2/23/2023   |   Inventor(s): Ryan Trovitch, Tufan Mukhopadhyay, Raja Pal, Hagit Ben-Daat, Tyler Porter
Keywords(s): Catalysis, Materials and Electronics, Mechanical and Manufacturing
Category(s): Advanced Materials/Nanotechnology
Metallic Films with Precisely Engineered Multimodal Architectures
Background Increased material strength and ductility are almost universally desired. However, a well-known tradeoff between the two parameters exists: Strong materials (such as ceramics) are typically brittle, while ductile materials (such as metals and metallic alloys) generally exhibit low to moderate strength. Efforts to overcome this strength-ductility...
Published: 2/23/2023   |   Inventor(s): Jagannathan Rajagopalan, Rohit Berlia
Keywords(s):  
Category(s): Physical Science, Advanced Materials/Nanotechnology, Manufacturing/Construction/Mechanical
Method for Producing Custom TiAl Nanocrystalline Alloys with Full 3D Microstructure Control
Nanocrystalline alloy coatings prevent oxidation and corrosion while improving a material’s electrical or mechanical properties. While nanocrystals provide significant advantages in performance, they often become unstable if subjected to heat or stress and lose their benefit as they merge and the crystals grow larger. The grain boundaries between...
Published: 2/23/2023   |   Inventor(s): Jagannathan Rajagopalan, Rohit Sarkar
Keywords(s): Materials and Electronics, Mechanical and Manufacturing
Category(s): Advanced Materials/Nanotechnology