Article
Chemistry, Multidisciplinary
Kirill Khabarov, Messan Nouraldeen, Sergei Tikhonov, Anna Lizunova, Alexey Efimov, Victor Ivanov
Summary: This study investigates the interactions between nanosecond pulsed-periodic laser radiation and aerosol agglomerates of gold nanoparticles synthesized in a spark discharge. The dynamics of nanoparticles size changes during sintering process depend on the laser pulses energy, characterized by an S-shaped shrinkage curve. The result of nanoparticles' laser modification is largely determined by the pulse energy and the efficiency of the nanoparticles' radiation absorption.
Article
Chemistry, Multidisciplinary
Max Niemeyer, Patrick Bessel, Pascal Rusch, Rasmus Himstedt, Daniel Kranz, Hadir Borg, Nadja C. Bigall, Dirk Dorfs
Summary: This study investigates the heating of gold and gold-zinc oxide nanocrystals in a metal-organic framework using nanosecond laser pulses. The irradiation of Au@ZIF-8 composite particles results in the heating of the gold core and decomposition of the surrounding matrix. The study also shows that the surrounding material can be heated to a distance equivalent to the decomposition of ZIF-8.
Article
Chemistry, Multidisciplinary
Jian-Hua Wang, Shao-Peng Wang, Pavel N. Melentiev, Bin Kang, Jing-Juan Xu, Hong-Yuan Chen
Summary: SPASER nanoparticles with small size, ultranarrow spectral-line and good biocompatibility have great potential as biomedical nanoprobe. However, the light absorption capacity of Au-resonator poses challenges to their photo-stability under strong pumping-laser, which requires careful consideration of structure parameters and external pumping-laser conditions for optimal performance and minimal photo-damage.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Zhichao Li, Xi Chen, Shirui Yang, Donghe Zhang, Jie Xu, Rui Ma, Debin Shan, Bin Guo
Summary: Liquid-assisted pulsed laser cleaning technique is employed to treat titanium alloy oxide film, resulting in the formation of micro- and nanostructured amorphous-nanocrystalline phases oxidized layer. The surface morphology, composition, and structure are characterized by various microscopy techniques. Optimal surface quality is achieved under specific laser fluence and spot overlap ratio conditions. The mechanisms of liquid-assisted laser cleaning involve laser-induced shock wave, laser ablation, and phase blasting, providing effective surface cleaning and material processing.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Environmental
Seung Jun Lee, Jayaraman Theerthagiri, Myong Yong Choi
Summary: This study investigated the dynamics of laser-induced cavitation bubbles (LICBs) during pulsed laser ablation (PLA) of a nickel target in different solvents. It was found that the lifetime of LICBs depended on the liquid environment and strongly defined the phases of the Ni nanoparticles (NPs) formed. The prepared Ni NPs showed enhanced sensitivity and electrochemical performance, with the fcc/hcp Ni structure displaying the best performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Ichiro Tatsuno, Yuna Niimi, Makoto Tomita, Hiroshi Terashima, Tadao Hasegawa, Takahiro Matsumoto
Summary: The novel disinfection technology using visible pulsed light irradiation provides an effective and selective way to inactivate bacteria, offering a promising method for the site selective inactivation of various pathogenic viruses and bacteria in a safe and simple manner.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Analytical
Reshma Kaimal, Periyathambi Senthilkumar, Belqasem Aljafari, Sambandam Anandan
Summary: This study develops a scheme to reduce the crystalline size of gold nanoparticles on the surface of MWCNTs to generate a LAMWCNT-Au heterostructure. The heterostructure enables ultra-sensitive glutathione sensing through an easy electrochemical procedure based on voltammetry analysis. The results demonstrate that the LAMWCNT-Au heterostructure exhibits exceptional electrocatalytic activity, stability, and reproducibility, making it a promising biosensing prototype for the identification of glutathione.
Article
Chemistry, Physical
Enrico Di Russo, Francesco Sgarbossa, Pierpaolo Ranieri, Gianluigi Maggioni, Samba Ndiaye, Sebastien Duguay, Francois Vurpillot, Lorenzo Rigutti, Jean-Luc Rouviere, Vittorio Morandi, Davide De Salvador, Enrico Napolitani
Summary: Researchers have developed a new method for fabricating fully relaxed Ge1-ySny layers on Ge substrates with Sn concentrations up to 13 at. %. By sputtering thin Sn films directly onto Ge wafers followed by pulsed laser melting, Sn was successfully incorporated into Ge. Microstructural analyses revealed that below 6 at. % Sn concentration, the Ge1-ySny layers were fully substitutional and strained, with few defects. For Sn concentrations above 6 at. %, Sn-rich regions were observed around dislocations. However, outside these regions, the Ge1-ySny layers displayed a homogeneous Sn distribution, full substitutionality, strain relaxation, and excellent crystal quality. This new approach offers a promising alternative to epitaxy and ion implantation for high-quality Ge1-ySny alloy fabrication, with the added benefit of spatially confined thermal processes using pulsed laser melting.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Ceren Korkut, Kamil Cinar, Ismail Kabacelik, Rasit Turan, Mustafa Kulakci, Alpan Bek
Summary: Understanding the dynamics of laser crystallization process of Ge thin films using nanosecond pulsed infrared lasers is crucial for producing high-quality crystalline films for various applications. By implementing suitable parameters, the researchers were able to successfully crystallize amorphous Ge films with domain sizes exceeding tens of micrometers using a ns pulsed IR laser. This work demonstrates a promising method for locally crystallizing thin films with minimized thermal energy budget.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Thermodynamics
Shiyu Li, Jinxin Wang, Xiao Wang, Yongpan Cheng, Wei-Cheng Yan
Summary: This study uses a numerical model to investigate the mechanism of laser ablation for space debris removal. The model incorporates various physical processes involved in laser ablation, such as heating, melting, and evaporation of the target material (Aluminum), formation of plume and plasma, and plasma shielding. Validation of the model is achieved by comparing simulated results with experimental data, demonstrating the accuracy of the model in describing laser ablation processes. The study systematically examines the effects of laser irradiance, wavelength, and pulse width on laser ablation. Continuous laser ablation and the influence of laser pulse time interval are also explored.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Optics
Muidh Alheshibri, Khaled Elsayed, Shamsuddeen A. Haladu, Saminu Musa Magami, Abbad Al Baroot, Ismail Ercan, Filiz Ercan, Abdullah A. Manda, Emre cevik, T. S. Kayed, Aamerah A. Alsanea, Amjad Mujawwil Alotaibi, Amal L. Al-Otaibi
Summary: A simple and reproducible self-templating method was developed to synthesize silver nanoparticles decorated on CNTs/TiO2 nanocomposite using nanosecond pulsed laser ablation. The resulting nanocatalysts showed enhanced photocatalytic degradation of methylene blue dye contaminant. Morphology, heterostructure, and the nature of incorporation of the nanocomposite catalysts were confirmed by TEM and SEM microscopy. XRD analysis confirmed the crystalline nature of the nanocatalysts. PL analysis provided information about surface defects and electron-hole recombination properties of the prepared nanocatalysts. Efficient ultraviolet light-induced photodegradation of the dye was achieved using the TiO2/CNT and Ag/TiO2/CNT nanocomposite catalysts.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
V. Iacono, C. Lo Po, S. Scalese, S. Boninelli, G. G. Condorelli, M. G. Grimaldi, F. Ruffino
Summary: This study investigated the synthesis of copper and nickel nanoparticles as catalysts for alkaline water splitting reactions. The performance of these catalysts in hydrogen evolution and oxygen evolution reactions was evaluated, and the results showed that both copper and nickel nanoparticles exhibited good catalytic activity. The ultra-low amount of catalyst material used in this study achieved higher mass activity compared to existing technologies.
Article
Materials Science, Multidisciplinary
Zhenlin Zhang, Yue Zhao, Yang Chen, Zhen Su, Jiguo Shan, Aiping Wu, Yutaka S. Sato, Huaipeng Gu, Xin Tang
Summary: A paraxial powder-feeding system utilizing a quasi-continuous fiber laser machine was developed to repair non-weldable nickel-based K447A alloy. By adjusting the duty cycle of the pulsed-wave laser, the length of hot cracking in the cladding zone was significantly reduced. The high cooling rate in the laser extinguishment process resulted in the formation of a fine dendrite zone in the cladding layer, providing increased resistance against hot cracking propagation.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Qi Sun, Jian-Zhong Zhou, Xian-Kai Meng, Jia-Nian Yang, Zhao-Heng Guo, Ming Zhu, Shun Guo
Summary: This paper investigated the nanosecond pulse laser surface treatment of waterborne anti-rust paint on HT250 gray cast iron, examining paint removal mechanisms, parameters, and thresholds for substrate ablation. The study found four thresholds and three mechanisms in the paint removal process, with potential for removing paint layers without damaging the substrate by optimizing laser parameters.
Article
Chemistry, Multidisciplinary
Abdullah A. Manda, Q. A. Drmosh, Khaled A. Elsayed, Amal L. Al-Alotaibi, Ibrahim Olanrewaju Alade, Sagheer A. Onaizi, Hatim D. M. Dafalla, A. Elhassan
Summary: This study synthesized a full-spectrum responsive TiO2/Y2O3 nanocomposite and investigated its impact on the structural, morphological, and optical properties of TiO2. The results showed that the addition of Y2O3 not only altered the properties of TiO2 but also significantly enhanced its light absorption characteristics in the UV and visible region. These composites could potentially have important applications in visible-light responsive systems.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Michael R. Armstrong, Harry B. Radousky, Ryan A. Austin, Elissaios Stavrou, Hongxiang Zong, Graeme J. Ackland, Shaughnessy Brown, Jonathan C. Crowhurst, Arianna E. Gleason, Eduardo Granados, Paulius Grivickas, Nicholas Holtgrewe, Hae Ja Lee, Tian T. Li, Sergey Lobanov, Joseph T. McKeown, Bob Nagler, Inhyuk Nam, Art J. Nelson, Vitali Prakapenka, Clemens Prescher, John D. Roehling, Nick E. Teslich, Peter Walter, Alexander F. Goncharov, Jonathan L. Belof
Summary: In Zr, a dynamically stabilized body-centered cubic (bcc) intermediate state was discovered under uniaxial loading at sub-nanosecond timescales instead of the expected transformation to the omega-Zr phase. Experiments and simulations highlighted the importance of metastability and time dependence in phase transformations, emphasizing the need to consider kinetics in addition to the phase diagram in material crystalline structure prediction.
Article
Chemistry, Physical
Ryan H. Allaire, Lou Kondic, Linda J. Cummings, Philip D. Rack, Miguel Fuentes-Cabrera
Summary: The study shows that when the phase separation length scale is much smaller than the instability length scale, patterned materials break up into nanoparticles, while soluto-capillarity significantly affects the instability when the two length scales are close. Differences in surface energy between materials can lead to material migration and modify the instability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Javier A. Diez, Alejandro G. Gonzalez, David A. Garfinkel, Philip D. Rack, Joseph T. McKeown, Lou Kondic
Summary: This study investigates the coupled process of phase separation and dewetting of nanoscale metal alloys on solid substrates through experiments and theoretical modeling. Results indicate the crucial role of temperature dependence of material properties in understanding experimental findings.
Article
Nanoscience & Nanotechnology
David A. Garfinkel, Vasudevan Iyer, Robyn Seils, Grace Pakeltis, Marc R. Bourgeois, Andrew W. Rossi, Clay Klein, Benjamin J. Lawrie, David J. Masiello, Philip D. Rack
Summary: Trimer meta-atoms composed of three gold rods were fabricated and their near-field plasmonic responses were characterized. The magnetic and electric modes of the trimer structure could be tuned by changing the length of the rods. The study also found that the intensity of the electric mode increased more than expected, while the magnetic mode showed the expected tilt dependence. This research opens up new possibilities for studying the nanoscale excited-state of other magnetic meta-atom structures.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
David A. Garfinkel, Nan Tang, Grace Pakeltis, Reece Emery, Ilia N. Ivanov, Dustin A. Gilbert, Philip D. Rack
Summary: The magnetic and optical properties of AuxCo1-x thin films and nanoparticles can be tuned by controlling their chemical composition and morphology. Annealing leads to phase separation and enhances the magnetic properties. The optical properties are greatly influenced by the chemical morphology, where phase separation enhances the quality factor and optical absorption.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Instruments & Instrumentation
Leo Saturday, Chris Luck, Leslie Wilson, Jason D. Fowlkes, Philip D. Rack, Nicholas J. Evans
Summary: This study presents a method to simulate the Spallation Neutron Source and characterize the thermal failure of NCD foils. A test stand with in situ diagnostics is used to track foil sublimation and thinning, and a COMSOL simulation is developed to assess potential changes to the NCD film and predict foil temperatures under different beam conditions.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Chemistry, Multidisciplinary
Sumeer R. Khanna, Michael G. Stanford, Ivan V. Vlassiouk, Philip D. Rack
Summary: In this study, CuxN1-x alloy thin films were used as catalysts for graphene growth at atmospheric pressure. By adjusting the alloy composition, the growth of graphene was controlled. The results showed that graphene primarily grew as a single layer when the Cu concentration (x) was above 69 at.%.
Article
Nanoscience & Nanotechnology
John Lasseter, Philip D. Rack, Steven J. Randolph
Summary: In this study, a method for selectively depositing 3D nanostructures using photothermal transport is reported. The ability to initiate the process on sub-diffraction-limit nanoscale features is demonstrated. Thermal simulations show that the geometric shape and optical and thermal properties of the nanostructures are crucial for controlling the CVD reaction.
ACS APPLIED NANO MATERIALS
(2022)
Article
Instruments & Instrumentation
Leo Saturday, Leslie Wilson, Philip D. Rack, Nicholas J. Evans
Summary: This study compares the performance of nanocrystalline diamond stripper foils with microcrystalline alternatives under thermal load conditions. An electron beam mimic is used to evaluate their power dissipation and thermal durability, and postmortem testing is conducted to determine their physical properties.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Chemistry, Multidisciplinary
Jason D. Fowlkes, Robert Winkler, Philip D. Rack, Harald Plank
Summary: This article presents an electron dose compensation strategy, called DBEA, to address the structural artifact issue caused by temperature gradient in 3D nanoprinting using focused electron beam-induced deposition. By modulating the electron dose, the deviations caused by temperature variations can be corrected, thus improving the printing accuracy.
Article
Chemistry, Multidisciplinary
John Lasseter, Philip D. D. Rack, Steven J. J. Randolph
Summary: This study demonstrates the selective growth of high-purity gold films onto nanoscale 3D architectures using the Me2Au (acac) precursor and pulsed laser pyrolytic chemical vapor deposition. The high thermal resistance of the nanoscale geometries enables selective deposition. The effects of laser irradiance, pulse width, and precursor pressure on the growth rate were explored, and feature-targeting resolutions of approximately 100 and 5 μm were achieved using diode lasers coupled to multimode (915 nm) and single mode (785 nm) fiber optics, respectively. Finite element thermal modeling was used to rationalize the experimental results.
Article
Education, Special
Jason D. Fowlkes, Robert Winkler, Philip D. Rack, Harald Plank
Summary: 3D nanoprinting using focused electron beam-induced deposition is susceptible to structural distortions caused by temperature gradients. In this study, an electron dose compensation strategy called the Decelerating Beam Exposure Algorithm (DBEA) is proposed to correct for nanowire bending during computer-aided design. The DBEA utilizes an analytical solution derived from 3D nanoprinting simulations to offset undesired heating effects. This compensation strategy has the potential to improve the fidelity of 3D nanoscale printing.
RESEARCH IN AUTISM SPECTRUM DISORDERS
(2023)
Article
Chemistry, Multidisciplinary
Jason D. Fowlkes, Robert Winkler, Philip D. Rack, Harald Plank
Summary: 3D nanoprinting using focused electron beam-induced deposition often results in structural artifacts caused by temperature gradients during the deposition process. Researchers have developed an electron dose compensation strategy to correct for these artifacts and improve the precision of 3D nanoprinting.
Article
Materials Science, Multidisciplinary
Timothy G. Lach, Chinthaka M. Silva, Yufan Zhou, Walker L. Boldman, Philip D. Rack, William J. Weber, Yanwen Zhang
Summary: This study investigates the behavior of two sets of near-equiatomic CoCrCuFeNi thin films under irradiation in different environments. The results demonstrate the influence of composition and environmental exposure on the stability of high entropy alloys under radiation, providing insights into controlling these behaviors.
NPJ MATERIALS DEGRADATION
(2022)
Article
Materials Science, Multidisciplinary
Smaranika Dash, Dhiren K. Pradhan, Shalini Kumari, Ravikant, Md Mijanur Rahaman, C. Cazorla, Kumar Brajesh, Ashok Kumar, Reji Thomas, Philip D. Rack, Dillip K. Pradhan
Summary: The study reports on the piezoelectric and structural properties of the BZT-xBCT system over a wide composition range, with a significant electromechanical response observed at x = 0.5. The research provides clear evidence of crystallographic phases in the MPB region, contributing to improved functional properties.
