Article
Chemistry, Multidisciplinary
Aljaz Skrjanc, Dominik Jankovic, Anton Meden, Matjaz Mazaj, Erik Svensson Grape, Martin Gazvoda, Natasa Zabukovec Logar
Summary: This study reports the synthesis of the first Ni-based ZIFs and demonstrates their high potential as heterogeneous catalysts for the Suzuki-Miyaura cross-coupling reaction. The presence and arrangement of the carbonyl functional groups on the imidazole linker play a crucial role in completing the preferred octahedral coordination of nickel, providing a promising platform for the rational design of Ni-based ZIFs for a wide range of catalytic applications.
Review
Chemistry, Multidisciplinary
Ana Sousa-Castillo, Andrea Marino-Lopez, Begona Puertolas, Miguel A. Correa-Duarte
Summary: Bioorthogonal chemistry has provided a powerful tool for performing biocompatible chemospecific reactions in living systems, particularly in the areas of genetic encoding systems, bioimaging, and cancer therapy. This Minireview focuses on recent advances in the use of heterogeneous catalysts for bioorthogonal reactions, discussing the synthetic strategies of Pd-, Au-, and Cu-based materials, their applications in activating caged fluorophores and prodrugs, and the potential of using external stimuli for targeted drug release in diseased tissues. The review also highlights future directions and challenges in this emerging field.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Jie Li, Dan Peng, Chen Tan, Changle Chen
Summary: In this contribution, an outer-shell self-supporting strategy was designed to heterogenize nickel catalysts on different fillers via precipitation homopolymerization of ionic cluster type polar monomer. These catalysts demonstrated high activity, good product morphology control, and stable performances in ethylene polymerization and copolymerization. Moreover, various polyolefin composites with great mechanical and customized properties can be efficiently synthesized.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Physical
Mariachiara Miceli, Patrizia Frontera, Anastasia Macario, Angela Malara
Summary: Fast separation and efficient recycling of catalysts are important requirements in catalytic reactions. Traditional methods for catalyst recovery are inefficient and impractical for industrial scale, leading to the current focus on developing new methods for effective separation and recycling.
Article
Chemistry, Physical
Jacopo De Bellis, Michael Felderhoff, Ferdi Schuth
Summary: In this study, it was demonstrated that mixing multiple metal sources through ball milling can result in supported alloyed nanoparticles, expanding the method's application to the synthesis of supported bimetallic catalysts. The prepared Au-Pd and Au-Cu nanoparticles supported on MgO or YSZ were characterized using powder X-ray diffraction and electron microscopy, and their catalytic performance in CO oxidation was investigated to understand the impact of the synthetic method on the final catalyst materials.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
C. Scarfiello, M. Bellusci, L. Pilloni, D. Pietrogiacomi, A. La Barbera, F. Varsano
Summary: Ni60Co40 nanoparticles supported on gamma-Al2O3 are capable of catalysing the steam reforming of methane and providing the necessary heat by induction heating. The temperature reached on the catalyst surface is influenced by metal loading and particle size distribution, affecting the ability of ferromagnetic nanoparticles to convert the radio frequency field into heat effectively. The catalyst pellets demonstrated effectiveness in achieving high temperatures and methane conversion rates during the steam methane reforming reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Biochemistry & Molecular Biology
Melinda Krebsz, Laszlo Kotai, Istvan E. Sajo, Tamas Vaczi, Tibor Pasinszki
Summary: Nickel nanoparticles supported on carbon microspheres (Ni-NP/C) were successfully synthesized using a novel, low-cost and facile method for heterogeneous catalysis. The physical and chemical properties of Ni-NP/C were characterized in detail. Ni-NP/C exhibited efficient catalytic activity in the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride.
Review
Chemistry, Physical
Hongling Yang, Ganggang Li, Guoxia Jiang, Zhongshen Zhang, Zhengping Hao
Summary: Selective catalytic oxidation is crucial in fine chemical and petrochemical industries, but it is challenging to achieve selective production of target products in the presence of multiple reaction paths. Single atom catalysts, different from nanoclusters and nanoparticles, offer opportunities for highly selective catalytic oxidation. This review summarizes recent advances in using novel catalytic materials for challenging selective oxidation reactions, including methane oxidation, alcohol oxidation, alkene epoxidation, and carbon monoxide oxidation. The key factors affecting catalytic performance, such as the electronic and geometric structures of single atoms, nanoclusters, and nanoparticles, are discussed. Understanding the active species, structures, activity-structure relationship, and mechanisms of these catalytic systems are highlighted, along with current challenges and future developments, aiming to guide the design of efficient and highly selective catalysts for heterogeneous oxidation reactions and to better understand their catalytic behaviors in a unified way.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Applied
Oscar Ramirez, Sebastian Bonardd, Cesar Saldias, Yadira Zambrano, David Diaz Diaz, Angel Leiva
Summary: In this study, a series of hybrid materials composed of inorganic plasmonic mono- and bimetallic nanoparticles supported on organic bio-based hydrogel beads were synthesized and characterized. The bimetallic materials exhibited a localized surface plasmon resonance in the visible region and showed higher catalytic activity compared to the monometallic counterparts. Furthermore, the materials also demonstrated enhanced photocatalytic properties.
CARBOHYDRATE POLYMERS
(2022)
Article
Multidisciplinary Sciences
Vinson Liao, Maximilian Cohen, Yifan Wang, Dionisios G. Vlachos
Summary: Infrared spectra of adsorbate vibrational modes are accurate and easily obtainable for characterizing single-crystals and large nanoparticles, but not for highly dispersed heterogeneous catalysts composed of single-atoms and ultra-small clusters. In this study, the authors developed a method to generate synthetic IR spectra using data-based approaches and physics-driven surrogate models. They bypassed the vast combinatorial space of clusters by determining viable structures using machine-learned Hamiltonians, genetic algorithm optimization, and grand canonical Monte Carlo calculations. The synthetic spectra were used to predict cluster size distributions and quantify uncertainty in CO adsorption on Pd/CeO2 catalysts.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Sofia Huggias, Patricia A. Bolla, Julio C. Azcarate, Maria A. Serradell, Monica L. Casella, Pablo J. Peruzzo
Summary: This study synthesized platinum and silver nanoparticles dispersed on a support, demonstrating excellent catalytic activity, especially in the reduction of p-nitrophenol, with high conversion rates and recyclability. These bionanocatalysts show potential as emerging alternatives in the field of heterogeneous catalysts based on supported noble metal nanoparticles.
Review
Biochemistry & Molecular Biology
Anna Wolny, Anna Chrobok
Summary: Supported ionic liquid phases offer several advantages in catalysis, providing catalytic activity or efficient matrix and improving mass transport. Silica-based materials, due to their cost-efficiency and specific properties, are widely used in this field.
Article
Chemistry, Multidisciplinary
Kang Xia, Takafumi Yatabe, Kentaro Yonesato, Tomohiro Yabe, Soichi Kikkawa, Seiji Yamazoe, Ayako Nakata, Kazuya Yamaguchi, Kosuke Suzuki
Summary: A feasible method was developed for preparing supported anionic gold nanoparticle catalysts using multivacant lacunary polyoxometalates, confirming the strong electronic interaction between gold nanoparticles and the polyoxometalates, allowing for sequential modulation of the electronic states of the catalysts. The catalyst prepared using [SiW9O34](10-) showed superior catalytic performance and stability compared to supported gold nanoparticle catalysts without this modification.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Yuki Saito, Shu Kobayashi
Summary: The application of heterogeneous catalysts in continuous-flow enantioselective hydroacylation reactions was studied. Catalysts were prepared by mixing supports and rhodium complexes, and showed excellent activity and enantioselectivity. Under optimized conditions, the catalysts exhibited high turnover numbers and could be applied to various substrates. Furthermore, sequential-flow reactions with other heterogeneous catalysts were demonstrated for the synthesis of biologically active molecules and functional materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Rong Wang, Min Zhang, Jie Zhang, Jing-He Yang
Summary: Aromatic hydrocarbon catalytic hydrogenation is an effective method to reduce the toxicity and increase the value of aromatic hydrocarbons. Supported metal catalysts, especially nickel-based catalysts, have higher catalytic activity and selectivity. The research progress of nickel-based catalysts and the development prospects and challenges of non-precious metal catalysts for aromatic hydrocarbon catalytic hydrogenation have been reviewed. In addition, the sulfur tolerance and hydrogen storage properties of catalysts for aromatics are discussed.
Article
Chemistry, Physical
Ana Serrano-Lotina, Karen Cruz, Miguel A. Banares, Marco Daturi, Pedro Avila
Summary: Bimetallic shaped catalysts were prepared by wet equilibrium impregnation, where MnO2 was the main component and a second metal oxide (Co, Fe and Ce oxides) was added. The Ce-promoted catalyst showed the highest catalytic activity in the selective reduction of NOx with NH3 (88% NO conversion at 170 degrees C) due to its ability to adsorb NOx even in the presence of water. However, the Fe-promoted catalyst exhibited lower NOx conversion with NH3-SCR in the presence of water (65% NO conversion at 170 degrees C) due to the absence of NOx adsorbed species.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Ceramics
Rocio Estefania Rojas-Hernandez, Fernando Rubio-Marcos, Aida Serrano, Sara Roman-Sanchez, Jose Francisco Fernandez, Irina Hussainova
Summary: In this study, (hk0)-textured ZnAl2O4: Nd, Ce sub-micron films were synthesized using a screen printing technique assisted by a molten salt flux and deposited over the sapphire substrate. The focus was on controlling the Ce concentration in the emitting layers and determining the key parameters for the development of efficient ZnAl2O4-based films with remarkable optical properties. The degree of crystallinity and precise adjustment of texture were found to be crucial for improving NIR luminescence efficiency. Specifically, (hk0)-textured films developed at a sintering temperature of around 1300 degrees C exhibited higher NIR emission intensity compared to (hkl)-untextured films. This research demonstrates a feasible approach to achieve high NIR emission performance and validates its applicability for a wide range of applications.
CERAMICS INTERNATIONAL
(2023)
Review
Chemistry, Physical
Aida Serrano, Olga Caballero-Calero, Cecilia Granados-Miralles, Giulio Gorni, Cristina Manzano, Marta Rull-Bravo, Alberto Moure, Marisol Martin-Gonzalez, Jose F. Fernandez
Summary: This study demonstrates the use of a cold sintering process (CSP) to sinter CoSb3-based thermoelectric materials for the first time. The CSP yields samples with a relative density of 86% at 150℃ with a uniaxial pressure of 750 MPa, which is increased to around 92% after a post-annealing at temperatures ≥ 500℃ in Ar atmosphere. The CSP produces Te doped-CoSb3 nanocomposites with similar morphological and structural characteristics to the starting nanopowders obtained by ball milling in air atmosphere. The sintered thermoelectric nanocomposites exhibit a maximum figure of merit of 0.12(3) at room temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
C. Granados-Miralles, A. Serrano, P. Prieto, J. Guzman-Minguez, J. E. Prieto, A. M. Friedel, E. Garcia-Martin, J. F. Fernandez, A. Quesada
Summary: Due to their various applications, lithium ferrites are important materials for emerging technologies. The lithium content in lithium ferrites greatly affects their physical properties and the performance of devices based on these materials. In this study, magnetic lithium ferrite powders with different Li:Fe ratios were synthesized and the Li content was accurately determined using two independent methods. The sintering process led to substantial grain growth and the presence of trapped pores, while the magnetic properties and density of the ceramics were measured. The results provide valuable insights into the synthesis and characterization of lithium ferrites.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Ali Saffar Shamshirgar, Maria Fernandez Alvarez, Adolfo del Campo, Jose Francisco Fernandez, Rocio E. Rojas Hernandez, Roman Ivanov, Johanna Rosen, Irina Hussainova
Summary: This study incorporates graphene-augmented alumina nanofibers into epoxy resin to fabricate a tunable absorption multilayer structure for electromagnetic interference shielding and RF absorption. Highly aligned graphene augmented alumina nanofibers were produced using a hot wall one-step catalyst-free chemical vapor deposition method. The highest loss tangent of 0.4 was achieved in a composite containing 1 vol% of randomly oriented nanofibers. A superposed three-layer structure was fabricated, offering an absorption of >90% in the entire X-band and an absorption peak of -25 dB at around 11 GHz. The hybrid nanofibers with a dual loss function show potential for versatile design options in RF absorption.
Article
Biochemistry & Molecular Biology
Elizabeth Rojas Garcia, Gloria Perez-Soreque, Ricardo Lopez Medina, Fernando Rubio-Marcos, Ana M. M. Maubert-Franco
Summary: In this study, CNTs/Fe-BTC composite materials were synthesized using a one-step solvothermal method, with MWCNTs and SWCNTs incorporated in situ during synthesis. The composite materials were characterized and found to exhibit improved physical-chemical and optical properties compared to Fe-BTC pristine. The incorporation of CNTs into Fe-BTC not only showed higher production rates, but also changes in selectivity. Furthermore, the incorporation of CNTs allowed for increased electron mobility, decreased charge carrier recombination, and increased photocatalytic activity. These composite materials showed promise in converting CO2 to clean fuels that could replace fossil fuels soon.
Article
Chemistry, Applied
M. Olga Guerrero-Perez, Olga B. Lapina, Soren B. Rasmussen, Miguel A. Banares
Summary: Nanoscaled-VPO catalysts were prepared on an alumina support to achieve high surface-to-volume ratio of the active phase. Surface species transformations were studied using these nanoscaled catalysts, with minimized signal from the bulk. The chemical environment and oxidation state of the species were determined by NMR, ESR, and XANES spectroscopies. The results optimized V + P coverage and V/P molar ratio to minimize isolated vanadium oxide species and maximize V4+ concentration. The distribution of phosphorus islands greatly influenced the structure of the catalytic material for the desired partial oxidation reaction.
TOPICS IN CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Dante E. Gonzalez-Anota, Silvia P. Paredes-Carrera, Rosa M. Perez-Gutierrez, Brandon Arciniega-Caballero, Raul Borja-Urby, Jesus C. Sanchez-Ochoa, Elizabeth Rojas-Garcia
Summary: The extraction process of bioactives from cinnamon extract was optimized using Design Expert 11 program and ANOVA, with cinnamon weight, microwave power, and time as the parameters. Nanostructures of TiO2 were synthesized using the sol-gel method with microwave irradiation and Cinnamomum verum extract. The synthesized TiO2 displayed smaller crystal and particle sizes, higher crystallinity, and lower band gap compared to TiO2 synthesized without extract.
JOURNAL OF CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Fernando Rubio-Marcos, Paula Pamies, Adolfo Del Campo, Jordi Tiana, Jonathan Ordonez-Pimentel, Michel Venet, Rocio E. Rojas-Hernandez, Diego A. Ochoa, Jose F. Fernandez, Jose E. Garcia
Summary: A clear correlation between optical absorption and light-induced strain in ferroelectrics is shown. The phenomenon of photoinduced electronic reconstruction at charged domain walls is proposed as the primary physical mechanism. These results provide a new pathway for designing ferroelectric-based devices with new functionalities, such as thickness gradient-based photo-controlled nanoactuators.
APPLIED MATERIALS TODAY
(2023)
Article
Engineering, Electrical & Electronic
Mauro Difeo, Fernando Rubio-Marcos, Adolfo Del Campo, Miriam Castro, Leandro Ramajo
Summary: Sodium bismuth titanate based lead-free piezoceramics with modified dielectric and energy storage properties were obtained by doping Nb. The doping of Nb changes the material structure and microstructural characteristics, resulting in a transition from multiphasic coexistence to a single phase, and improving the piezoelectric response and energy storage properties of the material.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
A. Moure, P. Val-Gomez, A. del Campo, J. F. Fernandez, F. Rubio-Marcos
Summary: In this study, the stress dynamics and its temperature dependence arising from the Orthorhombic-Tetragonal Polymorphic Phase Boundary (PPB) in lead-free potassium sodium niobate (KNN)-based ceramics were investigated. The growth of Orthorhombic phases is limited by the high-temperature tetragonal phase distributions, and two main mechanisms regulate the decrease of stress processes: microstructural effects hinder the formation of non-180° domains, while ferroelectric domain distribution and local structural heterogeneity contribute to the phase transition widening.
MATERIALS & DESIGN
(2023)
Article
Instruments & Instrumentation
Alessio Sacco, Luisa Mandrile, Li-Lin Tay, Nobuyasu Itoh, Ankit Raj, Alberto Moure, Adolfo Del Campo, Jose F. Fernandez, Keith R. Paton, Sebastian Wood, Hyuksang Kwon, Tehseen Adel, Angela R. Hight Walker, Erlon Henrique Martins Ferreira, Ralf Theissmann, Thomas Koch, Andrea Mario Giovannozzi, Chiara Portesi, Andrea Mario Rossi
Summary: This article presents an interlaboratory comparison on Raman spectroscopy as a reliable method for quantification of TiO2 phases. Raman spectroscopy is a fast, non-invasive technique that can differentiate and measure TiO2 without the need for special reagents or sample preparation.
Article
Chemistry, Multidisciplinary
Jesus Carlos Guzman-Minguez, Cecilia Granados-Miralles, Patrick Kuntschke, Cesar de Julian Fernandez, Sergey Erokhin, Dmitry Berkov, Thomas Schliesch, Jose Francisco Fernandez, Adrian Quesada
Summary: This study aims to explore the magnetic properties of hard-soft composite permanent magnets and their correlation with microstructure. The experimental results show that increasing the particle size of the soft phase can enhance the remanence in injection molded magnets. Through experimental analysis and simulations, it is revealed that the interaction between the hard and soft phases is of a dipolar nature.
Article
Construction & Building Technology
Jacqueline Roberta Tamashiro, Miguel Angel de la Rubia, Fernando Rubio-Marcos, Rocio Estefania Rojas-Hernandez, Lucas Henrique Pereira Silva, Fabio Friol Guedes de Paiva, Angela Kinoshita, Amparo Moragues Terrades
Summary: This study comprehensively explores the impact of ZnO particle morphology on cement hydration. It is found that ZnO nanoparticles can delay the hydration process, while ZnO microparticles can enhance mechanical properties.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Rocio E. Rojas-Hernandez, Fernando Rubio-Marcos, Jallouli Necib, Mati Danilson, Jose F. Fernandez, Irina Hussainova
Summary: Near-infrared (NIR) emitting phosphors are in high demand for their applications in various fields. This study focuses on synthesizing ZnAl2O4:Ce/Nd films of nanometer thickness for NIR emission using a cost-efficient approach. The use of polycrystalline alumina substrates enhances emission intensity. The concentration of Ce4+ influences NIR emission. The findings contribute to understanding film production processes and guide future studies on NIR emitters.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
