Article
Physics, Multidisciplinary
Xiaoli Guo, Cheng Jin, Ziqiang He, Song-Feng Zhao, Xiao-Xin Zhou, Ya Cheng
Summary: This study presents a method to retrieve the angle-dependent strong-field ionization of aligned molecules' highest occupied molecular orbital (HOMO) from high-order harmonic generation (HHG). The research shows that the angle-dependent ionization of HOMO can be successfully retrieved at low and high degrees of alignment, but the error in retrieval increases with uncertainty in the alignment distribution.
CHINESE PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Kinran Lau, Patrick Schuehle, Shun-Xing Liang, Florian de Kock, Jakob Albert, Sven Reichenberger
Summary: The study on laser-based synthesis of InOx/ZrO2 catalysts with different particle sizes and loadings demonstrates potential, while also revealing that the preparation methods under different laser conditions can affect the morphology and activity of the catalysts. Results show that catalysts prepared under different laser conditions perform equally well as their wet-chemical prepared counterparts for methanol synthesis, suggesting the potential of in situ fragmentation for independent studies of size and composition with controllable structural modifications.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Physics, Multidisciplinary
L. Dakroub, T. Sinyakova, D. Cubaynes, C. Bomme, L. Chopineau, G. Garcia, O. Peyrusse, F. Quere, C. Bourassin-Bouchet, A. Klisnick
Summary: We implemented a laser-dressed photoionization method to measure the temporal structure of high-order harmonics from plasma mirrors at the attosecond scale. Numerical simulations showed that the infrared dressing pulse caused up-down asymmetry in the angular distribution of photoelectrons. Although we successfully detected single-shot photoelectron spectra with angular resolution using a velocity-map imaging spectrometer, we could not observe the impact of the infrared dressing field in the spectra. We discuss various issues that may have hindered these observations and suggest improvements to the setup.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Instruments & Instrumentation
Lei Xu, Yiyin Su, Jianwei Yang, Zhongqing Su
Summary: Researchers have developed a theoretical model to analyze the interaction between wideband laser-generated Rayleigh waves and surface cracks, and have validated the model through simulations and experiments.
SMART MATERIALS AND STRUCTURES
(2023)
Review
Energy & Fuels
Patrick Hemberger, Andras Bodi, Thomas Bierkandt, Markus Koehler, Dennis Kaczmarek, Tina Kasper
Summary: This article discusses the importance of using advanced tools such as spectroscopy and mass spectrometry in catalysis and combustion research, focusing on studying the reaction mechanisms of biomass conversion and combustion. Through examples, it delves into the application of PEPICO technology and its role in gaining deep insights into various chemical processes.
Article
Energy & Fuels
Dumitru Duca, Mostafiz Rahman, Yvain Carpentier, Claire Pirim, Adam Boies, Cristian Focsa
Summary: This study combines laser desorption/ionization mass spectrometry (L2MS) and advanced statistical techniques to investigate the impact of a catalytic stripper (CS) on the chemical composition of gasoline direct injection engine exhaust, focusing on the evolution of size-dependent chemical characteristics. The research demonstrates the necessity of a fine molecular-level characterization of exhaust particulate matter to evaluate the effect of the CS, especially for ultra-fine particles carrying the largest volatile fraction.
Article
Chemistry, Physical
M. Condorelli, L. D'Urso, G. Compagnini, E. Fazio, F. Neri, V. A. Litvinenko, E. Z. Kurmaev, I. S. Zhidkov
Summary: A two-step laser-assisted synthesis method in water was used to produce Pt@C hybrid structures. Raman and XPS spectroscopies showed the formation of stable Pt@C bonds between Pt NPs and polyynes, preventing oxidation during growth. This Pt@C system could potentially serve as a catalyst for various chemical reactions, with preliminary tests showing promising photocatalytic activities.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
I. I. Rakov, S. M. Pridvorova, G. A. Shafeev
Summary: Experimental results show that the interaction between gold nanoparticles generated by laser ablation in water and nanoparticles of copper and aluminum phthalocyanine leads to the aggregation of gold nanoparticles. However, this effect is not observed when aluminum phthalocyanine is added to silver nanoparticles also produced by laser ablation in water.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Materials Science, Multidisciplinary
Dae Cheol Choi, Hong Seok Kim
Summary: Core-shell Al nanoparticles with high purity and stable size were synthesized via pulsed-laser-ablation-in-liquid. Carbon species and carboxylates were found in the coating of the nanoparticles. The passivated Al nanoparticles exhibited high stability in reactive environments.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Inorganic & Nuclear
R. M. Freire, J. L. Palma, S. Michea, R. Ramirez, S. E. Baltazar, J. C. Denardin
Summary: This study investigated the inversion degree (X) of a Co-based spinel nanostructure by synthesizing and characterizing CoFe2O4 NPs, performing first-principles calculations, and comparing hysteresis loops with experimental data. The results suggested that the most probable inversion degree for this nanostructure was X = 0.75.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Multidisciplinary Sciences
Sara M. Franzen, Magdalena Tasic, Christian B. M. Poulie, Martin H. Magnusson, Daniel Strand, Maria E. Messing
Summary: The study found that the choice of solvent needs to be carefully matched with both the particle and support materials, and thermal annealing significantly increases the adhesion of the particles, expanding the scope of applications in aqueous media and for biological applications. The research provides valuable methods for investigating the stability of nanoparticle systems after exposure to solvents.
SCIENTIFIC REPORTS
(2021)
Article
Biophysics
Sara Gimondi, Joana Vieira de Castro, Rui L. Reis, Helena Ferreira, Nuno M. Neves
Summary: In this study, the interaction between nanoparticles (NPs) and different types of cells was investigated. The results showed that the internalization of NPs by cells was size-dependent, with the highest uptake efficiency observed for 30 nm NPs. Different endocytic pathways were initiated in the presence of particular NP sizes, suggesting the importance of size in mediating the interaction between NPs and specific cell types.
COLLOIDS AND SURFACES B-BIOINTERFACES
(2023)
Article
Optics
Mizuho Fushitani, Yoshitaka Kawabe, Hikaru Fujise, Makoto Yamada, Hiroka Hasegawa, Shigeki Owada, Tadashi Togashi, Kyo Nakajima, Makina Yabashi, Akitaka Matsuda, Yasumasa Hikosaka, Akiyoshi Hishikawa
Summary: The ultrafast dynamics of highly excited Rydberg states of Xe+ were investigated using time-resolved shot-by-shot photoelectron spectroscopy with EUV-free-electron-laser pump and near-infrared probe pulses. The results showed that this technique is a powerful tool for studying ultrafast electron emission processes, reflecting the lifetimes of autoionizing Rydberg states.
Article
Chemistry, Physical
P. Nica, C. Ursu, C. Focsa
Summary: This study investigated the vacuum expansion of a transient carbon plasma produced by KrF excimer laser, and found a significant increase in the production of C2+ and C1+ fast ions with higher laser pulse energy. The slower singly charged ions in the thermal plasma part were less affected by the irradiation conditions.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Applied
Ziyi Zhang, Maki Kushimoto, Akira Yoshikawa, Koji Aoto, Chiaki Sasaoka, Leo J. Schowalter, Hiroshi Amano
Summary: This study investigates the temperature dependence of key parameters and their impact on achieving continuous-wave lasing in AlGaN-based laser diodes at UV-C wavelengths. The reduction in threshold voltage was achieved by tapering the sides of the laser diode mesa and reducing the lateral distance between the n- and p-electrodes. Continuous-wave lasing at room temperature was demonstrated with a threshold current density of 4.2 kA/cm(2) and a threshold voltage of 8.7 V.
APPLIED PHYSICS LETTERS
(2022)
Article
Energy & Fuels
Pedro M. de Oliveira, Daniel Fredrich, Gianluigi De Falco, Ingrid El Helou, Andrea D'Anna, Andrea Giusti, Epaminondas Mastorakos
Summary: The ultralow emission combustor concept based on flameless oxidation demonstrates the potential for achieving clean and efficient combustion of aviation kerosene. It shows soot-free and single-digit NOx levels under atmospheric conditions, attributed to a unique combustor mixing configuration. The experimental results are supported by numerical simulations, providing further insights into mixing and air dilution effects on emissions and combustion completeness.
Article
Thermodynamics
Stefano Veronesi, Mario Commodo, Luca Basta, Gianluigi De Falco, Patrizia Minutolo, Nikolaos Kateris, Hai Wang, Andrea D'Anna, Stefan Heun
Summary: In this study, the morphological and electronic properties of incipient soot particles formed during combustion were investigated using STM and STS techniques. The results revealed the size and semiconductor behavior of the incipient soot particles.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Serafina Bocchicchio, Mario Commodo, Lee Anne Sgro, Massimo Chiari, Andrea D'Anna, Patrizia Minutolo
Summary: The elemental and organic carbon content of flame-generated soot nanoparticles were determined by thermo-optical-transmission measurements, while the carbon structure was characterized by Raman spectroscopy analysis. The study found that elemental carbon content is lower in young soot nanoparticles and increases in mature soot particles, while organic carbon content shows the opposite trend. Raman spectroscopy results revealed a consistent trend in the graphitization order of different soot particles.
Article
Environmental Sciences
Elena Scaglione, Gianluigi De Falco, Giuseppe Mantova, Valeria Caturano, Alessia Stornaiuolo, Andrea D'Anna, Paola Salvatore
Summary: This study describes five decontamination methods for used surgical masks using common household equipment, aiming to reduce the environmental impact of single-use masks. Results show that immersion in 80 degrees C water and microwave-assisted sterilization are the most effective methods, without altering mask filtration efficiency and breathability.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Energy & Fuels
G. De Falco, S. Bocchicchio, M. Commodo, P. Minutolo, A. D'Anna
Summary: The effect of oxidation on nascent soot particles was investigated using Raman spectroscopy. The study found that different samples of soot particles had different chemical compositions and structures, and subsequent oxidation treatments resulted in various changes.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Engineering, Chemical
Francesco Parrillo, Carmine Boccia, Giovanna Ruoppolo, Mario Commodo, Franco Berruti, Umberto Arena
Summary: This study investigates the effect of temperature and steam concentration on water-gas and reforming reactions for tar cleaning in syngas production. Two catalysts were used and the Fe/gamma-Al2O3 catalyst showed better performance. The nature of coke layers deposited on the catalyst surface was examined using microscopy and spectroscopy techniques.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Mario Commodo, Gianluca Serra, Serafina Bocchicchio, Patrizia Minutolo, Matteo Tommasini, Andrea D'Anna
Summary: The study investigates different types of soot particles formed by flames and examines their temperature dependence behavior using off-line variable-temperature Raman spectroscopy. The results show that the nanostructural order of different types of soot particles affects their thermal expansion behavior.
Article
Chemistry, Multidisciplinary
Patrizia Minutolo, Gianluigi De Falco, Mario Commodo, Alberto Aloisio, Andrea D'Anna
Summary: A porous nanostructured film of flame-formed carbon nanoparticles has been produced, and its morphological and structural characteristics have been characterized. The film exhibits nonmetallic behavior, with a monotonic decrease in resistance as temperature increases. Electrical conduction is explained by charge carriers tunneling and percolation between carbon grains. The film shows a high absolute temperature coefficient of resistance (TCR) and is ideal for temperature sensing.
APPLIED SCIENCES-BASEL
(2022)
Article
Thermodynamics
Patrizia Minutolo, Mario Commodo, Andrea D'Anna
Summary: Accurate understanding of the optical properties of soot nanoparticles is crucial for applications such as measuring soot concentration in combustion environments and assessing environmental impact. While there is considerable agreement on the optical properties of mature soot particles, the properties of incipient soot nanoparticles remain uncertain. This study revisits the determination of refractive index and optical properties of inception particles in lightly sooting flames. By analyzing both light absorption and particle size measurements, the study confirms a significant decrease in absorptivity in the visible to near-infrared region for inception particles with a unimodal size distribution of d 63 & SIM;3 nm. The results also highlight the strong dependence of soot optical properties on particle size.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Luigi Miniero, Khushboo Pandey, Gianluigi De Falco, Andrea D'Anna, Nicolas Noiray
Summary: This study investigates the flame topology and spray characteristics of a low-emission LEAF combustor fueled with Jet A-1 and hydrogen at atmospheric condition. The results show that injecting hydrogen into the combustor can stabilize a LEAF topology at low air-to-liquid massflow ratio (ALR) and achieve very low emissions of soot and NO x at the combustor exhaust, even without preheating of the combustor air.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Editorial Material
Energy & Fuels
Matteo Pelucchi, Maria Abian, Mario Commodo
FRONTIERS IN ENERGY RESEARCH
(2022)
