Article
Nanoscience & Nanotechnology
Felix Blendinger, Daniel Seitz, Andreas Ottenschlager, Monika Fleischer, Volker Bucher
Summary: TiO2 thin films deposited on PEEK using PEALD method show promising osteogenic properties, enhancing the bioactivity of the implants effectively.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Keun Yong Lim, Hong Hee Kim, Ji Hyun Noh, So Hyun Tak, Jae-Woong Yu, Won Kook Choi
Summary: A triple-layered structure of a-SiNx:H/SiOxNy/hybrid SiOx (ASH) thin film encapsulation (TFE) method was performed on QD-LEDs using reproducible PECVD and dip-coating processes. The ASH films exhibited high transmittance and low water vapor transmission rate. The ASH films also demonstrated comparable performance to glass lid encapsulation in extending the lifetime of QD-LEDs.
Article
Materials Science, Multidisciplinary
Pi-Chun Juan, Kuei-Chih Lin, Wen-Hao Cho, Chi-Chung Kei, Wei-Hsuan Hung, Hao-Pin Shi
Summary: Molybdenum oxide thin films were synthesized using plasma-enhanced atomic layer deposition, and the effect of plasma power on film structure was investigated. The film structure changed from orthorhombic phase to metastable monoclinic phase as the plasma power increased. Different grain morphologies were observed at different power levels, and the interfacial layer thickness was thinner at low powers. X-ray diffraction confirmed the presence of only +6 oxidation state of Mo in the films.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Hwichul Yang, Miju Ku, Jongheon Kim, Daye Lee, Hansam Lee, Young-Beom Kim
Summary: While ASSBs have gained attention as next-generation energy storage devices, the challenges between cathodes and solid-state electrolytes have been identified as the major technical issues. In this study, the use of particle atomic layer deposition (ALD) was introduced for conformal coating on cathode active materials (CAMs) to create a buffer layer. The results demonstrated that the buffer layer fabricated through particle ALD effectively suppresses side reactions and enhances the performance of ASSBs.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Coatings & Films
Kamesh Mullapudi, Nishit M. Murari, Ryan H. Mansergh, Douglas A. Keszler, John F. Conley
Summary: This work demonstrates controlled area-selective deposition of aluminum oxide phosphate (AlPO) at room temperature and near atmospheric pressure using a potentially zero-waste aerosol jet fog (ajFOG) deposition system. The process involves coating Octyl-trichlorosilane (OTS-8) self-assembled monolayers (SAMs) on SiO2/Si substrates, forming hydrophobic and hydrophilic regions through ultraviolet/ozone exposure, and selectively depositing AlPO onto the hydrophilic regions. Smooth films with sharp boundaries are achieved, with investigation into features and defects as a function of various parameters.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Engineering, Environmental
Mu Liu, Xiaolei Bao, Fahao Ma, Minrui Wang, Liren Zheng, Zeyan Wang, Peng Wang, Yuanyuan Liu, Hefeng Cheng, Ying Dai, Yuchen Fan, Zhaoke Zheng, Baibiao Huang
Summary: The use of supercycle ALD technology has led to superior performance and stability for the TiO2@Cu system during CO2 reduction reaction, which was previously unattainable by traditional post-deposition TiO2 methods. This study has demonstrated a promising approach for enhancing the potential of ALD technique in the field of photocatalysis.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Venkatesan Jayaraman, Amarnath T. Sivagurunathan, Sangeeta Adhikari, Do-Heyoung Kim
Summary: Transition metal nitrides (TMNs) are promising electrode materials for high-performance electrochemical energy storage devices. However, their practical deployment has been limited by structural instability during electrochemical reactions. This study demonstrates a new method to fabricate stable energy storage devices with exceptional electrochemical performance and high energy density.
Article
Nanoscience & Nanotechnology
Yujin Jo, Yong Tae Kim, Hoonsung Cho, Min-Kyung Ji, Jaeyeong Heo, Hyun-Pil Lim
Summary: The study aimed to create a uniform zirconia layer on complex structures using atomic layer deposition (ALD). The results showed that zirconia coatings via ALD reduced bacterial adhesion and increased osteoblast cell viability, indicating the potential for reducing peri-implantitis and improving osseointegration on implant surfaces.
INTERNATIONAL JOURNAL OF NANOMEDICINE
(2021)
Review
Chemistry, Multidisciplinary
William Chiappim, Benedito Botan Neto, Michaela Shiotani, Julia Karnopp, Luan Goncalves, Joao Pedro Chaves, Argemiro da Silva Sobrinho, Joaquim Pratas Leitao, Mariana Fraga, Rodrigo Pessoa
Summary: The increasing demand for miniaturized devices has led to high importance and requirements for nanofabrication technologies that are of high-quality, low temperatures, and low cost. In recent years, the development of atomic layer deposition (ALD) processes has sparked interest in their use in advanced electronic and nano/microelectromechanical systems (NEMS/MEMS) device manufacturing. Non-thermal plasma (NTP) technology has emerged as a significant technique that expands the process window of ALD and allows the fabrication of various nanomaterials at lower temperatures, enabling the coverage of thermosensitive substrates with good formability and uniformity. This review article comprehensively describes the impact of NTP on the ALD universe and its applications in device fabrication. It also presents the integration of NTP and ALD technologies to form the plasma-assisted ALD (PA-ALD) technique, which has been successfully used in nanofabrication and surface modification. The advantages and limitations of this technique are discussed, along with the introduction of atomic layer etching (ALE) technique, another development of the NTP and ALD junction that has gained attention for plasma-assisted nanofabrication.
Article
Metallurgy & Metallurgical Engineering
Mirco Peron, Susanna Cogo, Maria Bjelland, Abdulla Bin Afif, Anup Dadlani, Elisa Greggio, Filippo Berto, Jan Torgersen
Summary: The study investigates the corrosion behavior and biological response of ALD TiO2, HfO2, and ZrO2 coatings on AZ31 alloy. Results indicate improved corrosion resistance and cytotoxicity of all three coatings, with HfO2 showing the highest performance in terms of corrosion resistance and cell viability.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Coatings & Films
Mina Shahmohammadi, Yani Sun, Judy Chia -Chun Yuan, Mathew T. Mathew, Cortino Sukotjo, Christos G. Takoudis
Summary: Functionalizing Ti-6Al-4V alloy with TiO2 and ZrO2 thin films using Atomic Layer Deposition showed that the mixed TZO film had the best corrosion protection, enhancing the durability and lifetime of dental implants in aggressive oral environments.
SURFACE & COATINGS TECHNOLOGY
(2022)
Review
Chemistry, Physical
Amarnath T. Sivagurunathan, Sangeeta Adhikari, Do-Heyoung Kim
Summary: PEC water splitting is a promising method to generate hydrogen, but challenges remain in improving efficiency, such as energy loss during light-harvesting and electrode degradation. Interfacial interactions between electrode and electrolyte are crucial for overall efficiency. Post-surface modification using ALD has attracted attention for enhancing PEC efficiency.
Article
Materials Science, Multidisciplinary
Leonid Filatov, Pavel Vishniakov, Ilya Ezhov, Ivan Gorbov, Denis Nazarov, Denis Olkhovskii, Rajesh Kumar, Shengjie Peng, Gang He, Vladislav Chernyavsky, Marina Gushchina, Maxim Maximov
Summary: This article investigates the impact of atomic layer deposition method on the growth of carbon nanotubes, and found that the initial NiO layer thickness plays a significant role in achieving intensive growth of carbon nanotubes.
Article
Chemistry, Multidisciplinary
Muhammad Farooq Khan Niazi, David Munoz-Rojas, Damien Evrard, Matthieu Weber
Summary: With increasing concerns about environmental impacts, novel nanotechnologies and nanomaterials are being explored as solutions to pollution. This study compares the environmental performance of conventional atomic layer deposition (ALD) and spatial ALD (SALD), finding that SALD generally performs better in most assessed impact categories.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Surbhi Gupta, Manya Mittal, Anurag S. Rathore
Summary: This study demonstrates the use of atomic layer deposition (ALD) to uniformly coat drug particles, reducing surface charge and improving the properties of the particles. The coated drugs showed similar thermal stability, delayed dissolution rate, and no statistically significant cytotoxicity compared to the uncoated samples.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Ceramics
Rebecca J. O'Toole, Bola Yoon, Christopher J. Gump, Rishi Raj, Alan W. Weimer
Summary: The addition of nanoscale Al2O3 films to 8YSZ powders during flash sintering enhances grain growth, changes the conductivity of the starting powder, and effectively alters the flash onset temperature.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Engineering, Chemical
Julia Hartig, Hannah C. Howard, Tanner J. Stelmach, Alan W. Weimer
Summary: Continuous vibrating spatial particle ALD reactors were developed for high powder throughput with minimized footprint. The reactors operate below fluidization using linear vibration, and discrete element-method simulations were performed to study solid flow behavior. High-frequency excitations and sticking avoidance in horizontal conveyors at low accelerations were revealed, leading to a proposed novel sawtooth excitation for cohesive fine powders convection at low flow velocities.
Article
Chemistry, Physical
Sarah K. Bull, Theodore A. Champ, Sai Raj, Robert C. O'Brien, Charles B. Musgrave, Alan W. Weimer
Summary: In this study, atomic layer deposition was used to coat substrates with boron nitride films, providing resistance to hydrogen reaction. Computational and experimental analyses confirmed the stability and hydrogen diffusion resistance of the coatings.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Chemical
Annika Lai, Hailey C. Loehde-Woolard, W. Wilson McNeary, Jessica Burger, Robert Pfeffer, Alan W. Weimer
Summary: This paper introduces a novel method using Particle Molecular Layer Deposition (MLD) to functionalize amines in order to improve regeneration stability and adsorption capacity of supported amine sorbents. The results demonstrate low sorbent regeneration temperatures and stable regeneration of active sites over multiple cycles for both APTES and TMPTA functionalized sorbents. This study marks the first application of an MLD process for sorbent functionalization for CO2 capture, as well as the first use of TMPTA for MLD.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Kent J. Warren, Justin T. Tran, Alan W. Weimer
Summary: The use of hydrogen as a renewable fuel has been hindered by the lack of clean and economical production methods. Traditional solar thermochemical processes have limitations in efficiency. In this study, it is shown that isothermal water splitting using iron aluminate-based materials can overcome these limitations and achieve a higher hydrogen production capacity.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Sarah K. Bull, Theodore Champ, Sai Raj, Alan W. Weimer, Charles B. Musgrave
Summary: Density functional theory was used to screen refractory materials as high-temperature hydrogen permeation barriers. The study calculated activation energies and analyzed the properties of diffusing hydrogen atoms in the materials. Experimental evaluation confirmed the resistance of some nitride materials to nitrogen loss at high temperatures. This research provides theoretical support for effective hydrogen barriers at high temperatures.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Ceramics
Rebecca J. O'Toole, Chanel Hill, Peter J. Buur, Christopher J. Bartel, Christopher J. Gump, Charles B. Musgrave, Alan W. Weimer
Summary: Aluminum nitride (AlN) is a promising material for electronic substrates and heat sinks. To reduce its reaction with water, particle atomic layer deposition (ALD) was used to coat AlN powders with yttrium oxide (Y2O3) films. The addition of Y2O3 enabled high density sintering of AlN powders.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Sarah F. Zaccarine, Shaun M. Alia, W. Wilson McNeary, Raphael Chattot, Michael J. Dzara, Isaac Martens, Scott A. Mauger, Alan W. Weimer, Jakub Drnec, Bryan S. Pivovar, Svitlana Pylypenko
Summary: In this study, extended-surface platinum nickel (PtNi) nanowires synthesized using ALD technique were investigated to explore the durability benefits and tunability of kinetic properties. The results demonstrate the potential pathways for further improving the performance of this class of materials.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Chemical
Julia Hartig, Abhishek Shetty, Davis R. Conklin, Alan W. Weimer
Summary: A CFD-DEM model was developed to investigate the interactions between gas and solid particles in bulk powder beds. The simulations considered the minimum fluidization velocity and van der Waals cohesive forces of different powder sizes, and explained the trends in particle convection. The simulations showed that fine powders under high cohesive forces experienced competition between drag and cohesion effects.
Article
Engineering, Chemical
Alan W. Weimer
Summary: This passage describes the commercialization paths of two new powder processing technologies, which started as laboratory curiosities and eventually became two new businesses. Both projects faced skepticism, technical and financial challenges. One project involved a collaboration with a major chemical company to synthesize advanced non-oxide powder materials using a newly discovered processing route. The other project resulted in the establishment of a spinoff company from a university lab, focusing on novel coating of particles to functionalize surfaces. These successes were attributed to understanding scientific and engineering fundamentals, intellectual property protection, and identifying viable market opportunities.
Article
Materials Science, Ceramics
Rebecca J. O'Toole, Bola Yoon, Sanjit Ghose, Alan W. Weimer, Charles B. Musgrave, Rishi Raj
Summary: We present first-time results for in-operando flash sintering synchrotron experiments carried out in current rate mode, allowing for a longer time dependence of the sintering behavior. Two results are shown: comparison of temperatures measured with the platinum standard to those predicted by the black body radiation model, and measurements of excess lattice expansion as a function of density. This work highlights the potential of current rate experiments for gaining further insights into the mechanisms of flash sintering.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Chemical
Julia Hartig, Vidumin Dahanayake, Julie Nguyen, Carter Wilson, Austin M. Barnes, Alan W. Weimer
Summary: A moving porous media (MPM) modeling methodology was developed for reactor-scale CFD simulations of continuous spatial particle atomic layer deposition (ALD). The continuous vibrating reactor process for particle ALD was modeled using a porous media approach. Candidate porous reactor baseplates were characterized experimentally before their permeabilities were used as inputs for the MPM model. Parameter sweeps revealed the dependence of surface titration uniformity and residual gas breakthrough on operating conditions and powder properties. Suboptimal dose start times and inlet gas compositions led to parasitic chemical vapor deposition reactions in the first precursor zone.
Article
Materials Science, Ceramics
Emmanuel Bamidele, Syed I. A. Jalali, Alan W. Weimer, Rishi Raj
Summary: By directly injecting current into tungsten specimens, we can sinter them quickly within a controlled time range of 2 to 200 seconds. The sintering occurs at the same current density regardless of the current rate. This rapid sintering is instigated by the formation of Frenkel pairs and the recombination of electrons and holes, accelerating mass transport and generating photons.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Justin T. Tran, Kent J. Warren, Dragan Mejic, Robert L. Anderson, Lucas Jones, Dana S. Hauschulz, Carter Wilson, Alan W. Weimer
Summary: Through careful experimentation, it has been demonstrated that operating at elevated pressures can improve the equilibrium extent and rate of the thermochemical dissociation reaction. These findings have important implications for the viability of commercial systems and the development of a process for the production of green hydrogen.
Review
Chemistry, Physical
Mahesh B. Venkataraman, Alireza Rahbari, Philip van Eyk, Alan W. Weimer, Wojciech Lipinski, John Pye
Summary: Algal biomass is a promising feedstock for carbon-neutral fuel production due to its high growth rates and potential for cultivation on non-arable land. Supercritical water gasification offers advantages, but faces challenges in algae breakdown mechanisms, as well as integration of concentrated solar-thermal heat. The falling cost of green hydrogen input presents new opportunities for achieving lower-cost solar-SCWG systems.
SUSTAINABLE ENERGY & FUELS
(2021)
