Article
Engineering, Chemical
Paulina Szo, Maksymilian Fr, Waldemar Pichor
Summary: The influence of sol composition, water content, selected alcohols, deflocculant, and acid on the photocatalytic properties of TiO2 powders obtained by the sol-gel method was investigated. It was found that TiO2 powders containing two polymorphs exhibited superior photocatalytic properties compared to single-phase powders with anatase.
Article
Materials Science, Ceramics
Shadpour Mallakpour, Mina Naghdi
Summary: A bone scaffold was fabricated using a hybrid of TiO2@LDH to leverage the advantages of both nanostructures, with LDH providing a suitable bed for TiO2 nanoparticles and Alg embedding them for stability. The scaffold showed excellent biomineralization and antibacterial properties, making it a promising candidate for bone tissue engineering.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Jaroslav Cihlar, Lizeth Katherine Tinoco Navarro, Jaroslav Cihlar, Vit Kasparek, Jan Michalicka, Klara Castkova, Istvan Lazar, Jaroslav Kastyl, Ladislav Celko, Michal Vesely, Petr Dzik
Summary: Anatase/brookite nanoparticles were synthesized using low-temperature hydrolysis and polycondensation of titanium isopropoxide in the presence of acetic acid derivatives. The modified acetic acids formed bridges between neighboring titanium species, facilitating their condensation and the formation of Ti-O-Ti bonds. The resulting heterophase junctions between anatase and brookite exhibited high photocatalytic activity for hydrogen production when combined with a Pt cocatalyst. The photocatalysts had a mesoporous structure and large specific surface area, contributing to their high performance.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Vanessa R. A. Ferreira, Manuel A. Azenha, Carlos M. Pereira, Antonio F. Silva
Summary: This study demonstrated for the first time the possibility of generating organically modified hollow TiO2 microspheres via a simple sol-gel synthesis, and made significant progress in selective adsorption and molecular imprinting.
Article
Materials Science, Multidisciplinary
Ma Guadalupe Garnica-Romo, Mariana Romero-Arcos, Hector Eduardo Martinez-Flores
Summary: In this study, a bioreceptor consisting of a titania-based nanostructure was developed using the sol-gel method. The bioreceptor, called TiO2/NAF/LAC, was able to immobilize laccase and detect gallic acid. Experimental results showed that the bioreceptor had a low detection limit and a wide linear range.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Chemistry, Physical
Ksh Priyalakshmi Devi, Pranab Goswami, Harsh Chaturvedi
Summary: Although TiO2 is a popular semiconductor photocatalyst, its efficiency for solar energy conversion is limited due to its large bandgap. This paper introduces a cost-effective Sol-Gel technique using spin coating technology to fabricate nanocrystalline TiO2 thin films. The authors managed to achieve a dopant-free pure anatase nanocrystalline TiO2 thin film with a low band gap. Thorough investigations on the film's structure, optical characteristics, and surface morphology were conducted and presented.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Carla Calabrese, Amelie Maertens, Alessandra Piras, Carmela Aprile, Leonarda Francesca Liotta
Summary: TiO2 nanomaterials were synthesized through a sol-gel method using titanium butoxide as a precursor, Pluronic F127 as a template, toluene as a swelling agent, and acidic water or ethanol as reaction solvents. The synthesis medium influenced the phase composition of the solids, with ethanol promoting dispersed anatase particles and water leading to a rutile phase. The photocatalytic activity of the samples was tested by the photodegradation of Rhodamine B.
Article
Chemistry, Inorganic & Nuclear
Fu-Guang Zhang, Miao Cheng, Yong-Jun Yuan, Qing-Yu Liu, Quan Cheng, Jie Guan
Summary: Solar-driven lignocellulosic biomass-to-H2 conversion through photocatalysis is an economical and clean approach to generate hydrogen fuel. A highly efficient photocatalyst, Pt nanocluster chemically anchored porous TiO2 microspheres with abundant oxygen vacancies, was constructed to enhance the conversion efficiency. This study demonstrates the successful production of hydrogen fuel from different lignocellulosic biomass sources.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Rani P. Barkul, Radhakrishna S. Sutar, Meghshyam K. Patil, Sagar D. Delekar
Summary: In this study, boron-doped TiO2 nanoparticles were used to decontaminate environmentally non-benign organic pollutants, with the 7.0 mol % B@TiO2 showing the highest photocatalytic degradation activity among all samples tested.
Article
Chemistry, Physical
V. R. A. Ferreira, M. A. Azenha, C. M. Pereira, A. F. Silva
Summary: The objective of this study was to explore the synthesis of highly crystalline molecularly imprinted TiO2 microspheres at low calcination temperatures, with the preservation of their hollow shape and selective binding sites through acidic pretreatment. It was found that the microspheres obtained after calcination at 250 degrees C exhibited the highest photocatalytic efficiency and selectivity under UV irradiation.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Materials Science, Multidisciplinary
Sh Tabatabai Yazdi, M. Mousavi, Gh H. Khorrami
Summary: V2-xCoxO5 nanoparticles with Co concentrations up to x = 0.2 were synthesized via a sol-gel route in gelatin medium. The synthesized particles mainly consist of crystalline alpha-V2O5 phase, with the particle size increasing from about 34 to 49 nm as the Co content rises. These nanoparticles are found to be direct band gap semiconductors with band gap energies controlled by surface and interface effects rather than chemical composition, and the ferromagnetic nature is influenced by Co substitution.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Polymer Science
Abubakar Katsina Usman, Diana-Luciana Cursaru, Gheorghe Branoiu, Raluca Somoghi, Ana-Maria Manta, Danuta Matei, Sonia Mihai
Summary: The study presents the preparation of anatase phase {001}-TiO2/Au hybrid nanocomposites using a sol-gel synthesis technique and investigates their photocatalytic activity. The characterization results demonstrate the structure and performance of the materials, showing promising photodegradation efficiencies under direct sunlight illumination.
Article
Materials Science, Coatings & Films
Jonathan M. Schuster, Maria L. Vera, Carlos E. Schvezov, Mario R. Rosenberger
Summary: In this study, a nanoporous/compact titanium oxide coating was synthesized on the Ti-6Al-4V alloy using the anodic oxidation and sol-gel dip-coating techniques. The coating exhibited a thickness of 600 nm, low surface roughness, and a crack-free structure, with a crystalline structure of anatase and rutile.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Energy & Fuels
Foroozan Samimi, Maryam Ghiyasiyan-Arani, Masoud Salavati-Niasari
Summary: A series of Ca-Mn-O based nanostructures were synthesized through a sol-gel procedure assisted by leucine. The effect of Ca:Mn ratio in the synthesis process was examined to study the purity and components of samples. The resulting Ca2Mn3O8/CaMn3O6 nanocomposites showed promising electrochemical hydrogen storage capacity, making them a potential active material in energy storage systems.
Article
Chemistry, Physical
Fahriye Donmez, Nezihe Ayas
Summary: In this study, Ni/TiO2 catalysts were synthesized using the sol-gel technique and characterized through various methods, while the effects of different factors on hydrogen production performance were investigated. It was found that high hydrogen yield and production rate could be achieved under specific reaction conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
A. Tozri, Sh Alhalafi, Ziyad A. Alrowaili, Mongi Horchani, Aref Omri, R. Skini, S. Ghorai, A. Benali, Benilde F. O. Costa, Gulce O. Ildiz
Summary: Nanoparticles of Na-doped La0.8Sr0.15Na0.05MnO3 (LSNMO) synthesized via sol-gel route exhibit excellent magnetic and structural properties, showing potential applications in active magnetic refrigerators and hyperthermia treatments. The study also highlights the crucial role of magnetic inhomogeneity and dipolar interactions in determining the magnetic properties of NP-LSNMO.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Mariana E. Ghica, Claudio M. R. Almeida, Laura S. D. Rebelo, Gabriel C. Cathoud-Pinheiro, Benilde F. O. Costa, Luisa Duraes
Summary: This study developed a novel promising thermal insulator material based on alumina-silica aerogel composites reinforced with Kevlar (R) pulp. The material was prepared using less hazardous base catalysts and ambient pressure drying procedures. The resulting composites exhibited low bulk density, low thermal conductivity, and high thermal stability.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
V. A. Khomchenko, M. Das, J. A. Paixao, M. Silibin, D. Karpinsky
Summary: The perovskite compounds Bi0.85Ca0.15Fe1-xMnxO3 (0.1 <= x <= 0.5) were prepared and studied using various techniques. It was observed that the increase in Mn concentration resulted in crystal and magnetic structure modifications, leading to different magnetic behaviors at room temperature. The samples exhibited spontaneous magnetization at lower temperatures, which could also be induced by the application of a magnetic field. Furthermore, a coexistence of antiferromagnetic and glassy magnetic phases was observed in certain concentration ranges.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Bernardo A. Nogueira, Susana M. M. Lopes, Teresa M. V. D. Pinho e Melo, Jose A. Paixao, Alberto Milani, Chiara Castiglioni, Rui Fausto
Summary: The molecular and crystal structures of N-picryl-m-phenolidine were investigated using quantum chemical calculations and single crystal X-ray diffraction. The compound exhibits four low-energy conformers and forms a monoclinic crystal structure with unique hydrogen bonding interactions.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Environmental Sciences
Joao Pinto, Mariana Dias, Joana Amaral, Maxim Ivanov, Jose A. Paixao, Manuel A. Coimbra, Paula Ferreira, Eduarda Pereira, Idalina Goncalves
Summary: This study investigates the degradation of bioplastics in aquatic systems and finds that UV-aged bioplastics undergo changes in structure and properties, with increased mercury sorption capacity. This suggests that bioplastics may potentially amplify the spread of mercury along the food chain when disposed in water.
MARINE POLLUTION BULLETIN
(2022)
Article
Chemistry, Multidisciplinary
Helena Alberto, Rui C. Vilao, Eduardo F. M. Ribeiro, Joao M. Gil, Marco A. Curado, Jennifer P. Teixeira, Paulo A. Fernandes, Jose M. Cunha, Pedro M. P. Salome, Marika Edoff, Maria Martins, Thomas Prokscha, Zaher Salman, Alois Weidinger
Summary: As devices become smaller and more complex, the interfaces between materials become more important in determining device performance. In this study, low-energy muon spin rotation (mu SR) spectroscopy was used to investigate the interface between the chalcopyrite Cu(In,Ga)Se-2 absorber and various buffer layers. Depth resolution in the nm range was achieved by implanting the muons at different energies. The study revealed a region near the interface where the lattice was more distorted than within the absorber, attributed to a long-range strain field caused by defects. The measurements allowed quantification of the passivation effect of the buffer layers, with cadmium sulfide providing the best defect passivation in the near interface region. The experiment demonstrated the potential of low energy mu SR spectroscopy for studying interfaces in multilayer systems.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Bernardo A. Nogueira, Susana M. M. Lopes, Alberto Milani, Vania Andre, Jose A. Paixao, M. Ermelinda S. Eusebio, Teresa M. V. D. Pinho E. Melo, M. Teresa Duarte, Chiara Castiglioni, Rui Fausto
Summary: This study investigates the color polymorphism exhibited by a novel member of the ROY family, called ROY-ol. Four color polymorphs of ROY-ol were identified and characterized using crystallography, spectroscopy, and thermal analysis methods. The conformational space of ROY-ol was also explored through calculations, revealing correlations between the molecular conformation landscapes and polymorphic characteristics.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Biochemistry & Molecular Biology
Patricia S. M. Amado, Ines C. C. Costa, Jose A. Paixao, Ricardo F. Mendes, Sofia Cortes, Maria L. S. Cristiano
Summary: This study synthesized and characterized trioxolane-pyrazole and tetraoxane-pyrazole hybrids, which displayed activity against Leishmania parasites. Some of the compounds showed antileishmanial activity, but solubility issues might affect their effectiveness. Eight salt forms were prepared and some of them showed a broader spectrum of antimicrobial activity.
Article
Chemistry, Multidisciplinary
Maxim Ivanov, Timur Nikitin, Susy Lopes, Yulong Duan, Jialiang Xu, Rui Fausto, Jose Antonio Paixao, Paula Maria Vilarinho, Theo Rasing, Sergey Semin
Summary: Organic polar crystalline materials have the potential to be promising alternatives for inorganic ferroelectrics, but they currently lack competitiveness due to their moderate polar properties and high phase transition temperature. However, the fluorenone derivative DPFO has been found to possess robust high-temperature piezo- and ferro-electric properties, attributed to the presence of intrinsic domain structures. Moreover, the polar properties of DPFO are found to be dependent on the thickness of the microfiber, resulting in different ferroelectric and piezoelectric behaviors.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Multidisciplinary Sciences
I. El Heda, R. Dhahri, J. Massoudi, E. Dhahri, F. Bahri, K. Khirouni, B. F. O. Costa
Summary: Cu0.5Fe2.5O4 nanoparticles were synthesized and confirmed to have the desired spinel phase through XRD and FTIR analysis. The conduction behavior was found to be semiconductor-like and explained by the NSPT model. The DC conductivity and hopping frequency showed a positive correlation, and the scaling of conductivity demonstrated the presence of Coulomb interactions. The compound exhibited low electrical conductivity and dielectric loss, but high permittivity, making it a promising candidate for energy storage, photocatalytic, and microelectronic applications.
Article
Crystallography
Maxim Ivanov, Arkadiusz Grempka, Arseniy Buryakov, Timur Nikitin, Licinia L. G. Justino, Rui Fausto, Paula M. Vilarinho, Jose A. Paixao
Summary: In this study, millimeter-sized single crystals of the molecular erbium(III) complex Er(acac)(3)(cphen) were successfully synthesized and their polar and electronic properties were examined at macro-, micro-, and nanoscale levels. The synthesized samples showed a monoclinic crystallographic structure with terrace-ledge surface morphology. The polar properties and hyperpolarizability were found to be related to the internal domain structure framed by the characteristic terrace-ledge topography. The results of this study are important for the application of molecular erbium(III) complex crystals in low-magnitude magnetic or electric field devices.
Article
Chemistry, Inorganic & Nuclear
Jose F. Malta, Marta S. C. Henriques, Jose A. Paixao, Antonio P. Goncalves
Summary: In this study, pure polycrystalline GaMo4Se8 compound was obtained through an innovative two-step synthetic route, and its phase purity and chemical composition were confirmed using the Rietveld refinement of the powder XRD pattern and SEM analysis. The magnetic phase diagram of polycrystalline GaMo4Se8 was investigated using DC and AC magnetometry, revealing the presence of cycloidal, skyrmionic, and ferromagnetic phases.
Article
Chemistry, Multidisciplinary
Carla Gomes, Mariana Costa, Susana M. M. Lopes, Bernardo Albuquerque Nogueira, Rui Fausto, Jose A. Paixao, Teresa M. V. D. e Melo, Luisa M. D. R. S. Martins, Marta Pineiro
Summary: The development of sustainable processes requires the integration of green chemistry principles. In this study, a solvent-free synthesis method was developed to prepare new copper catalysts, which efficiently catalyze cycloaddition reactions under solvent-free mechanochemical conditions. Through this process, the principles of atom economy, reduction of solvents and auxiliaries, design for energy efficiency, and reduction of derivatives and catalysis are combined.
NEW JOURNAL OF CHEMISTRY
(2024)
Article
Materials Science, Multidisciplinary
R. S. Silva, C. Santos, M. T. Escote, B. F. O. Costa, N. O. Moreno, S. P. A. Paz, R. S. Angelica, N. S. Ferreira
Summary: In this study, a B-site disordered double perovskite material was synthesized and found to exhibit unique magnetic properties and magnetocaloric coupling. Experimental results demonstrated the significant influence of the distribution of iron and cobalt ions on the material's magnetism.
Article
Chemistry, Physical
Sara Fateixa, Helena I. S. Nogueira, Jose A. Paixao, Rui Fausto, Tito Trindade
Summary: This study investigates the effect of relative humidity on the transition of pure anhydrous carbamazepine to the hydrate form. The results show that the presence of CBZ DH crystals can be detected at low concentrations and higher relative humidity accelerates the transformation process.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)