Dr. MOHAMMED KHALIFA, Ph.D.’s Post

Amorphous nanocrystals are a fascinating class of materials that combine the properties of two distinct material states: amorphous and nanocrystalline. Amorphous materials lack a well-defined atomic structure, like glass. This disordered arrangement of atoms can give them unique properties, such as high strength and good corrosion resistance. Nanocrystalline materials consist of grains, or crystals, that are extremely small, typically on the order of 1-100 nanometers. These tiny crystals can give nanocrystalline materials some interesting properties, such as superparamagnetism and high hardness. Amorphous nanocrystals are essentially a composite material that combines the benefits of both amorphous and nanocrystalline states. They typically consist of a disordered, amorphous matrix with embedded nanocrystals dispersed throughout. The specific properties of amorphous nanocrystals will depend on the composition of the material, the size and distribution of the nanocrystals, and the processing methods used to create them. However, some potential advantages of amorphous nanocrystals include: 🔎Improved mechanical properties, such as strength and hardness 🔎Enhanced electrical and magnetic properties 🔎Increased reactivity or catalytic activity 🔎Superior biocompatibility Researchers are actively exploring the potential applications of amorphous nanocrystals in a variety of fields, including: 💡Medicine: Amorphous nanocrystals could be used to deliver drugs more effectively or to develop new implant materials. 💡Electronics: Amorphous nanocrystals could be used to create new types of transistors or other electronic devices. 💡Energy: Amorphous nanocrystals could be used to develop more efficient solar cells or batteries. 💡Catalysis: Amorphous nanocrystals could be used to develop new catalysts for chemical reactions. As research into amorphous nanocrystals continues, we can expect to see even more exciting applications for this promising class of materials. #Amorphous #Nanocrystals #HangzhouVectorMagnets

These Chinese researchers report fatigue-free ferroelectric material that could be a game changer same as spintronics. Ferroelectric materials have switchable spontaneous polarization that can be reversed by an external electric field, which has been widely applied to non-volatile memory, sensing, and energy conversion devices. These researchers developed a fatigue-free ferroelectric system based on sliding ferroelectricity. A bilayer 3R-MoS2 dual-gate device was fabricated using the chemical vapor transport method. After 106 switching cycles with different pulse widths ranging from 1 ms to 100 ms, the ferroelectric polarization dipoles showed no loss, indicating that the device still retained its memory performance. Gemini says the following: Fatigue has restricted the use of ferroelectrics in certain applications. Fatigue-free materials could open doors for applications that require frequent switching or high endurance, such as: High-density non-volatile memory: Data storage devices with significantly higher density compared to current options. Faster and more efficient ferroelectric random-access memory (FRAM): Memory that retains data even when powered off, potentially offering faster read/write speeds than traditional flash memory. Highly durable sensors: Sensors that rely on the change in polarization of a ferroelectric material, potentially leading to more sensitive and reliable sensors. Energy harvesting devices: Devices that convert mechanical energy into electrical energy, potentially with improved efficiency due to fatigue-free operation. #climatechange #aiml #newcomputingarchitectures

Key Points Demand for Carbon Nanotubes: #CarbonNanotubes (CNTs) are one-dimensional nanomaterials with excellent thermal, mechanical, and electromagnetic properties, making them highly sought after in fields such as carbon-based integrated circuits, super-strong and tough fibers, transparent conductive films, and flexible wearable devices. High-end applications demand stringent requirements for CNTs in terms of length, orientation, defect levels, and purity. Challenges in Growing Ultra-Long CNTs: Ultra-long CNTs, which follow a tip-growth mode, are essential for meeting these requirements and realizing the intrinsic superior properties of CNTs. However, the growth process involves the self-assembly of tens of billions of atoms under stringent conditions, leading to low yield and array density typically less than 50 tubes per mm, limiting application development. 3. New Method with Floating Bimetallic Catalysts (FBCs): Building on their previous strategy of substrate interception guidance, Zhang’s team proposed an in-situ gas-phase synthesis method using FBCs (Figure 1). They introduced ferrocene and acetylacetonate salts (as iron and secondary metal precursors) into the reactor. The diverse and easily sublimable nature of acetylacetonate salts facilitates the formation of new binary alloy floating catalysts. 4. Process Description: The precursors undergo sublimation, decomposition, and coalescence at the reactor inlet to form FBC nanoparticles, which are continuously introduced into the reactor with carrier gas. The carbon source decomposes on the FBC particles, growing CNTs floating in the gas phase. Substrate edges in the reactor intercept these floating CNTs, guiding their growth and significantly increasing the probability of “kite” mode growth. FeCu catalysts grown CNT horizontal arrays showed markedly improved yield, density, and uniformity compared to Fe catalysts. info@graphenerich.com More details: https://lnkd.in/grteyiCt

Design of dual transmitter and single receiver coil to improve misalignment performance in inductive wireless power transfer system for electric vehicle charging applications - Elsevier Results in Engineering Journal, December 2024. Elsevier for Engineering R&D Elsevier for Energy Elsevier India Reed Elsevier Philippines The Elsevier Foundation Elsevier Academic & Government Europe Elsevier Africa Kodeeswaran Sankarraj, nandhini gayathri, Sanjeevikumar Padmanaban To reduce misalignment and improve the efficiency of the Inductive Wireless Power Transfer (IWPT) - the proposed interconnected two transmitter terminals idea is performed well when there is a change in the position of the vehicle. The LTspice simulation and experimental result shows that the proposed system achieves 1.95 kW with an efficiency of 93.07% at an air gap of 150 mm.

🔬 Groundbreaking Observation of Electron Transfer Unveiled 🌟 🔍 Delve into the latest scientific breakthrough in the observation of electron transfer. This discovery provides new insights into fundamental processes that drive various technologies, paving the way for advancements in energy, materials science, and electronics. 🌐🔧 🔗 Read the full article on Highways Today: https://lnkd.in/eBMqENwX #ConstructionNews #HighwaysToday #ElectronTransfer #ScientificBreakthrough #Innovation #TechInScience #Energy #MaterialsScience #Electronics

In this study, a report is prepared on significantly low specific contact resistivity of alloyed and non-alloyed ohmic contacts fabricated on an as-grown n+-GaN layer and measured with the transfer length method. A low ρc = 8 × 10−8 Ω cm2 is extracted for the alloyed Ti/Al/Ni/Au, and ρc = 4 × 10−7 Ω cm2 for the unannealed Ti/Pd/Au. To achieve these, a highly doped n+-GaN layer with ND = 1.5 × 1019 cm−3 is used. The results are derived from a study of three different metal contact stacks, namely Ti/Al/Ni/Au (20 nm/300 nm/20 nm/400 nm), Ti/Pd/Au (2 nm/5 nm/200 nm), and Mo/Au (30 nm/200 nm). The Ti/Al/Ni/Au metal contact is studied in both annealed and non-annealed conditions, whereas for the Ti/Pd/Au and Mo/Au ohmic contacts, a study is conducted without annealing. Their performance and thermal stability are evaluated with a four-probe TLM, with temperatures ranging from 25 to 150 °C. Finally, a theoretical model based on thermionic emission theory is employed to gain a deeper understanding of the physical mechanisms governing the behavior of the ohmic contacts. This study was conducted by Adamantia Logotheti, Navya Sri Garigapati, Ph.D and Erik Lind from The Division of Electromagnetics and Nanoelectronics (EMN) with collaborations from the Center of III-Nitride Technology at Lund University https://lnkd.in/g7SF5kMX

Ultrawide bandgap aluminum nitride semiconductor has extremely high breakdown field, good thermal conductivity, and exceptional stability, making it ideal for next-generation power electronics and deep UV photonics. In our latest MOCVD research, we have studied epitaxial growth modes and conductivity modulation mechanisms of silicon-doped AlN on cost-effective sapphire substrates. We also investigated how compensated defects affect conductivity, a critical process towards controlled conductivity of this extremely large bandgap semiconductor. All the epitaxy and characterization works are done at KAUST Advanced Semiconductor Lab and KAUST Core Labs. Great job by our postdocs and students and appreciate collaboration with Prof Ying Wu. KAUST (King Abdullah University of Science and Technology) KAUST Research Translation & Partnerships KAUST Innovation KAUST CEMSE KAUST Semiconductors #semiconductor #wide #bandgap #epitaxy #MOCVD Haicheng Cao Mingtao Nong Che-Hao Liao Glen Isaac Maciel García Vishal Khandelwal Ying Wu https://lnkd.in/e48vit-c

After I got my Ph.D in capacitive power transfer, I have started working on Inductive power transfer to reduce the misalignment issues. Finally our findings got accepted in Results in Engineering Journal, Elsevier. I would like to thank Prof. Sanjeevikumar Padmanaban for his support. #ev #wirelesscharging #publication #research

🗞 Electronic News! 🗞 Magnetite, the oldest and strongest natural magnet, has captivated scientists and researchers for centuries with its unique properties and diverse applications. Beyond its traditional use in electronics, this remarkable mineral has emerged as a key player in the field of spintronics, where devices operate based on the spin of electrons rather than conventional electrical current. The study of magnetite's magnetic and electronic properties has not only revolutionized various scientific disciplines but has also attracted the attention of renowned figures like Einstein, who recognized its significance in understanding magnetism. In addition to its pivotal role in the realm of spintronics, magnetite has been instrumental in advancing our knowledge of biomagnetism, catalysis, and paleomagnetism. Its versatility and adaptability have led to groundbreaking discoveries in these fields, paving the way for innovative technologies and applications. Researchers have long been intrigued by the potential of magnetite to revolutionize various industries and drive scientific progress. #electricalengineering #electronics #embedded #embeddedsystems #electrical #computerchips Follow us on LinkedIn to get daily news: HardwareBee - Electronic News and Vendor Directory

congratulations to Chanchal Saraswat for her research work published in Microelectronics Journal https://lnkd.in/g_dR_-Pa In this study, the optimization of metal-semiconductor contacts to reduce the contact resistance of ohmic contacts on n-type 4H-SiC. The commonly used Ni/Au metal scheme served as a reference. Two novel metal schemes were introduced (i) incorporating a thin interfacial Au layer (2 nm) into Ni/Au, resulting in Au/Ni/Au, and (ii) introducing a thin intermediate barrier layer of Ta (20 nm) into Ni/Au, resulting in Ni/Ta/Au. Rapid thermal annealing (RTA) is performed at different temperatures and durations and the electrical characteristics of the contacts are measured