Article
Chemistry, Multidisciplinary
Hao-Chin Huang, Kai-Yuan Hsiao, Yu-Han Tseng, Yan-De Chen, Ming-Yen Lu
Summary: In this study, an in situ transmission electron microscopy (TEM) heating system was used to investigate the morphological changes of cubic Ag nanoparticles (NPs) and Ag-based core-shell structures induced by sublimation, as well as the influence of shell coverage on thermal stability. It was found that large Ag NPs (>50 nm) showed a three-stage sublimation-induced morphological change, while small Ag NPs (<30 nm) showed a uniform sublimation. The sublimation process of core-shell NPs started at stage II, and the thermal stability was enhanced by carbon shell passivation.
Article
Physics, Applied
Subham Kumar Saha, Pritha Mondal, Navyashree Vasudeva, Rekha Mahadevu, Dev Kumar Thapa, Biswajit Bhattacharyya, Anand Sharma, Saurav Islam, Phanibhusan Singha Mahapatra, T. Phanindra Sai, Samartha A. Channagiri, Pavithra Bellare, Awadhesh Narayan, N. Ravishankar, Satish Patil, Arindam Ghosh, Anshu Pandey
Summary: In this article, the preparation methods and structural analysis of Au-Ag nanostructures are reviewed. The electrical and magnetic transitions in these materials are discussed, as well as the properties revealed from optical and electron microscopic probes.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hui Fang, Michael J. Wilhelm, Jianqiang Ma, Yi Rao, Danielle L. Kuhn, Zachary Zander, Brendan G. DeLacy, Hai-Lung Dai
Summary: The lifetime of hot electrons injected from Ag nanoplatelets to TiO2 nanorods was found to be 13.1 &PLUSMN; 1.5 fs, comparable to smaller spherical Ag nanoparticles. The larger surface to bulk ratio and larger surface area for direct contact with the semiconductor on Ag nanoplatelets explain the decrease in injection rate with increasing particle size. Ag nanoplatelets exhibit stronger coupling with TiO2 and higher efficiency as photosensitizers for photocatalysis due to their fast injection rate and stronger optical absorption compared to Au and dye molecules.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Heeyoung Kim, Hyewon Park, Mincheol Kang, Jeong Young Park
Summary: Plasmonic photoelectrochemical (PEC) water splitting has attracted great interest due to its ability to overcome the limitations of semiconductors in terms of light absorption. In this study, a Pt/Ag/TiO2 metal-semiconductor Schottky nanodiode was designed and fabricated as a photoanode to investigate the role of plasmonic hot carriers in plasmonic water splitting. By combining the designed PEC cell system with the nanodiode, it was demonstrated that the plasmonic hot carriers from Ag played a decisive role in the enhancement of photocatalytic efficiency by contributing to the oxygen evolution reaction.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Keeniya-Gamalage-Gehan C. De Silva, Madeline Finale, Sanchari Chowdhury
Summary: A composite plasmonic catalyst has been developed by depositing popular transition metal nanocatalysts (such as Ni and Pt) on refractory plasmonic titanium nitride (TiN) nanoparticles using visible light. These catalysts exhibit excellent catalytic properties under visible light conditions and can accelerate energy-intensive reactions such as bicarbonate reduction.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Multidisciplinary Sciences
Zofia Kielan-Grabowska, Justyna Bacela, Anna Ziety, Wioletta Seremak, Marta Gawlik-Maj, Beata Kawala, Beata Borak, Jerzy Detyna, Michal Sarul
Summary: This paper presents a surface modification of stainless steel orthodontic wires with TiO2: Ag using the sol-gel thin film dip-coating method in order to prevent the formation of bacterial biofilm. The study confirmed the presence of Ag nanoparticles on the coated surface, which have potential antimicrobial properties.
Article
Materials Science, Ceramics
S. Yu. Sokovnin, N. Pizurova, V. G. Ilves, P. Roupcova, M. G. Zuev, M. A. Uimin, M. V. Ulitko, O. A. Svetlova
Summary: ZrO2 and Ag doped ZrO2 powders were prepared and characterized. The Ag doped ZrO2 powders showed enhanced photocatalytic activity and cytotoxicity.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Wenhao Zhao, Liping Wen, Baoshun Liu
Summary: In this research, the effects of atmosphere on the electron relaxations of undecorated TiO2 and Ag-decorated TiO2 were studied using in situ photoconductance and diffuse reflection measurements. It was found that in a pure N-2 atmosphere, electron relaxation mainly occurred through transfer to residual O-2, with Ag nanoparticles forming a fast electron transfer pathway. The activation energy for electron transfer to O-2 was greatly reduced by Ag decoration. In an N-2 atmosphere containing methanol, the relaxation mechanism changed for Ag/TiO2 as the relaxations decreased with temperature, possibly due to methanol acting as a bridge for hole-electron recombination at the Ag/TiO2 perimeters. Reducing Ag nanoparticle size increased electron relaxations due to increased dispersion and interconnection. However, photocatalytic oxidations showed a decrease after Ag decoration, indicating that they were not limited by electron transfer to O-2.
Article
Materials Science, Multidisciplinary
Pankaj Soni, Lubna Aamir, Rishi Raj Singh Rathore, Afia Aslam, Deepshikha Rathore
Summary: A BaTiO3/Ag/WO3 nanocomposite was synthesized chemically and its gas sensing properties towards LPG were investigated. The confirmation of the composite formation was done through XRD, TEM, and FTIR analyses. The nanocomposite exhibited a direct band gap of 3.1 eV and absorption edge at 411 nm. The interaction between Ag, WO3, and BTO in the composite was characterized by specific vibrational bands. The nanocomposite showed high sensitivity towards LPG at high temperature, with good stability, short response and recovery times, and a limit of detection of 205 ppm.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Matej Bubas, Vesna Janicki, Stefano A. Mezzasalma, Maria Chiara Spadaro, Jordi Arbiol, Jordi Sancho-Parramon
Summary: The plasmonic response of Cu-Ag metal islands films was investigated, showing that silver enhances island growth and increases the percolation threshold of copper films. The optical response of the films can be widely and easily tuned by adjusting fabrication conditions.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Ly Ngoc Tai, Pham Duy Long, Ngo Thi Hong Le, Le Van Hong, Pham The Linh, Bui Xuan Khuyen, Bui Son Tung, Vu Dinh Lam
Summary: Ag-TiO2 thin films grown by a hydrothermal method exhibited excellent photocatalytic and water-splitting performances in the visible light region, disintegrating up to 99% of methylene blue solution and increasing the splitting efficiency from 0.3% to 1%.
Review
Chemistry, Multidisciplinary
Zilong Guo, Guo Yu, Zhiguo Zhang, Yandong Han, Guijian Guan, Wensheng Yang, Ming-Yong Han
Summary: The collective oscillation of free electrons at the nanoscale surface of gold nanostructures is modulated by various factors, including size, shape, phase, composition, assembly, and surroundings. These modulation techniques lead to changes in optical properties, metal-field-enhanced optical signals, luminescence spectral shaping, chiroptical response, and photogenerated hot carriers. The rich optical properties of gold nanostructures have enabled a wide range of applications in nanoscience and nanotechnology, including full-color displays, solar energy harvesting, photochemical reactions, optical sensing, and biomedical imaging.
ADVANCED MATERIALS
(2023)
Review
Optics
Siti Aishah Jupri, Sib Krishna Ghoshal, Muhammad Firdaus Omar, Khaidzir Hamzah, Nur Nabihah Yusof, Syariffah Nurathirah Syed Yaacob, Siti Khalijah Md Zain, Ibrahim Mohammed Danmallam
Summary: In this study, metal nanoparticles sensitized rare earth ions-doped magnesium zinc sulfophosphate glasses with Ag/TiO2 nanoparticles co-activation were prepared and characterized. The results showed that the optical properties of the glasses were improved by the Ag/TiO2 nanoparticles co-activation. The glass containing 0.3 mol% of TiO2 nanoparticles exhibited high stimulated emission cross-section and maximum quantum efficiency.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
B. D. S. Deeraj, Gejo George, N. R. Dhineshbabu, Suryasarathi Bose, Kuruvilla Joseph
Summary: This study focused on the preparation and characterization of zirconia incorporated PAN-based carbon nanofiber reinforced epoxy composites as effective EMI shielding materials. The results showed superior storage modulus and excellent EMI shielding effectiveness, especially stacking the ZrO2@CNF mats to achieve outstanding shielding effectiveness above -90 dB in the Ku band, which is significant for industrial, radar, and military applications.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Construction & Building Technology
Vishnu Prasad, K. Sekar, M. A. Joseph
Summary: The study evaluates the mechanical properties of unmodified and nano TiO2 coated flax fibre composites. Improvement in tensile, flexural, and interlaminar shear strength was observed with the use of nano TiO2 coating and silane treatment. Reduction in water diffusion coefficient and enhanced compatibility between fibres and matrix were achieved, leading to improved mechanical properties and water absorption resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Valeria Loise, Pietro Calandra, Abraham A. Abe, Michele Porto, Cesare Oliviero Rossi, Mariano Davoli, Paolino Caputo
Summary: This study aims to evaluate the different effects of additives on aged bitumen, including the use of rejuvenator and softening agents. Rejuvenators can bring bitumen back to its initial state, increasing the longevity of asphalt pavements; however, softening agents, while making aged bitumen more workable, may eventually result in road pavement breakage.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Polymer Science
Alessandro Pistone, Cristina Scolaro, Consuelo Celesti, Annamaria Visco
Summary: This paper reports the synthesis and characterization of novel coatings based on (3-aminopropyl)-triethoxysilane (AP) mixed with different amounts of glutaraldehyde (GA). The study found that higher GA content led to an earlier crosslinking reaction, resulting in coatings with increased hydrophobicity and adhesion properties, without compromising the final AP cross-linked network. Therefore, AP modification with GA shows effectiveness for protective coatings applications.
Article
Chemistry, Multidisciplinary
Mattea Carmen Castrovilli, Emanuela Tempesta, Antonella Cartoni, Paolo Plescia, Paola Bolognesi, Jacopo Chiarinelli, Pietro Calandra, Nunzia Cicco, Maria Filomena Verrastro, Diego Centonze, Ludovica Gullo, Alessandra Del Giudice, Luciano Galantini, Lorenzo Avaldi
Summary: The study presents the successful fabrication of a new environmentally-friendly laccase-based biosensor with unprecedented reuse and storage capabilities using the electrospray deposition (ESD) technique. The biosensor shows high selectivity for catechol detection and can withstand interference from other metal ions.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Physical
Paolino Caputo, Gennaro Ventruti, Pietro Calandra, Michele Porto, Bagdat Teltayev, Ruggero Angelico, Cesare Oliviero Rossi
Summary: This study examined the effects of artificial aging process on asphalt binders with different degrees of penetration. The researchers utilized rheological characterization, thermal analysis, and spectroscopy techniques to analyze the microstructural information and quantify the aromaticity of the aged asphaltene. The results showed that the parameter quantifying aromaticity is a reliable indicator of the aging extent of the bituminous materials.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Pietro Calandra, Simone Quaranta, Bruno Apolo Miranda Figueira, Paolino Caputo, Michele Porto, Cesare Oliviero Rossi
Summary: Inorganic small particles from mineral extraction can be used as additives to improve the mechanical properties of road asphalt. Bitumens with different concentrations of filler showed higher stress resistance and durability, with the best effect observed at a 10% filler concentration. This study demonstrates the feasibility of converting waste into valuable components and highlights the benefits of increased durability in terms of economy and environment.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Yerdos Ongarbayev, Ainur Zhambolova, Yerbol Tileuberdi, Zulkhair Mansurov, Cesare Oliviero Rossi, Pietro Calandra, Bagdat Teltayev
Summary: This paper examines the impact of aging processes on the viscoelastic characteristics of vacuum residue oxidation products modified with crumb rubber. The study finds that short-term aging increases the shear modulus of the samples, and the modified vacuum residue oxidation product with crumb rubber shows the highest rutting and fatigue parameters, indicating increased stiffness and elasticity. The research also reveals an expansion of the temperature range of plasticity for the modified product.
Article
Green & Sustainable Science & Technology
Paolino Caputo, Pietro Calandra, Valeria Loise, Adolfo Le Pera, Ana-Maria Putz, Abraham A. Abe, Luigi Madeo, Bagdat Teltayev, Maria Laura Luprano, Michela Alfe, Valentina Gargiulo, Giovanna Ruoppolo, Cesare Oliviero Rossi
Summary: Urban waste management is a challenging task as a significant amount of municipal solid wastes are not properly handled and landfilling remains a common practice. In addition, the road pavement industry generates waste asphalts that are no longer suitable for road paving. The ReScA project suggests a circular economy-based approach, utilizing pyrolysis to treat waste and using the residues as added-value ingredients for the asphalt cycle.
Article
Biochemistry & Molecular Biology
Jessica Barichello, Donatella Spadaro, Sara Gullace, Alessandro Sinopoli, Pietro Calandra, Alessia Irrera, Fabio Matteocci, Giuseppe Calogero, Stefano Caramori, Carlo Alberto Bignozzi
Summary: A transparent electrode made of gold nanoparticles was created using chemical reduction. It was compared with a commonly used gold-film-coated electrode to investigate its potential as a counter-electrode in dye-sensitized solar cells. The study found that the gold nanoparticles electrode achieved 80% average visible transmittance and showed promise for use in DSSCs.
Article
Chemistry, Physical
Fabrizio Lo Celso, Giampaolo Barone, Loredana Maiuolo, Vincenzo Algieri, Carmen Cretu, Pietro Calandra
Summary: This study investigates the solubility and molecular dynamics of two newly synthesized oxindole nitrones with proven antiproliferative and antioxidant activity in liquid amphiphile solvents using a combination of experimental and computational methods. The different chemical structures of the solvents provide different chemical environments for the nitrones, and the study highlights the intermolecular interactions involved in the stabilization of nitrones in the solvents, providing valuable information for the design of specific carriers for nitrones delivery.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Biochemistry & Molecular Biology
Michela Alfe, Valentina Gargiulo, Michele Porto, Renata Migliaccio, Adolfo Le Pera, Miriam Sellaro, Crescenzo Pellegrino, Abraham A. Abe, Massimo Urciuolo, Paolino Caputo, Pietro Calandra, Valeria Loise, Cesare Oliviero Rossi, Giovanna Ruoppolo
Summary: Refuse-Derived Fuels (RDFs) are segregated forms of wastes obtained from municipal solid wastes (MSWs) through mechanical-biological processing. RDFs, with higher calorific value, lower moisture content, and higher volatile and carbon contents, are more suitable for thermochemical valorization than MSWs. Pyrolysis and gasification are promising thermochemical processes for RDF treatment, leading to increased energy recovery efficiency, reduced pollutant emissions, and production of value-added products.
Article
Chemistry, Physical
Paolino Caputo, Vincenzo Algieri, Loredana Maiuolo, Antonio De Nino, Emilia Sicilia, Fortuna Ponte, Pietro Calandra, Cesare Oliviero Rossi
Summary: This study investigates the use of cellulose and treated waste cellulose as modifiers to enhance the mechanical performance of bitumen. Through acid treatment and bleaching, lignin is completely removed from waste cellulose derived from the agri-food industry. The research demonstrates the effectiveness of this biopolymer in modifying bitumen through fundamental rheological tests and quantum mechanical calculations.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Environmental Sciences
Chiara Abate, Angela Scala, Ottavia Giuffre, Anna Piperno, Alessandro Pistone, Claudia Foti
Summary: A speciation study was conducted to evaluate the potential use of L-carnosine as a sequestering agent for Pb2+ in aqueous solutions. Potentiometric measurements were performed at varying ionic strength and temperature to determine the best conditions for Pb2+ complexation. The study provided insights into the sequestration ability of L-carnosine and identified optimal pH and ionic strength conditions for efficient Pb2+ removal. The study also demonstrated the effectiveness of covalently grafting L-carnosine onto an azlactone-activated beaded-polyacrylamide resin for Pb2+ removal.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Physical
Michele Porto, Paolino Caputo, Pietro Calandra, Jacek Gapinski, Mikolaj Pochylski
Summary: Adding diphenyl phosphate (DPP) to bis(2-ethylhexyl) amine (BEEA) results in proton transfer and the formation of ionic liquid DPP/BEEA domains. These mixtures exhibit significant optical birefringence under a magnetic field, with the intensity depending on the amount of DPP. The magnetically-induced birefringence is reversible and reproducible, suggesting a local anisotropy rather than large supra-molecular rearrangements.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Alessandro Pistone, Annamaria de Gaetano, Elpida Piperopoulos, Chiara Abate
Summary: This study focused on the synthesis of chitosan-based macroparticles loaded with curcumin using two different gelling agents, sodium hydroxide and sodium tripolyphosphate. Various characterization techniques were used to analyze the resulting spherical particles, and the release of curcumin over time was studied. The results showed that both gelling agents led to high encapsulation efficiency of curcumin, with the TPP-crosslinked particles releasing the curcumin at a slower rate compared to the NaOH-crosslinked particles, indicating the potential use of these macrospheres in different applications.
Article
Engineering, Mechanical
Dario Milone, Giacomo Risitano, Alessandro Pistone, Davide Crisafulli, Fabio Alberti
Summary: This study evaluates the best materials for hip implants in prosthetic surgery from a tribological and mechanical perspective using a machine learning algorithm and Finite Element Method (FEM) simulations. The results show that the use of CoCr alloy/UHMWPE coupling provides the best wear behavior, and the topology optimization reduces the implant mass by 28.12%.
