Article
Chemistry, Physical
Roman Solovov, Verbina Orlichenia, Boris Ershov
Summary: Zerovalent iron nanoparticles with spherical shape and narrow size distribution were prepared by photochemical reduction of iron(III) in isopropyl alcohol.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Nanoscience & Nanotechnology
Fernando Fabris, Enio Lima, Jorge Martin Nunez, Horacio E. Troiani, Myriam H. Aguirre, Victor Leboran, Francisco Rivadulla, Elin L. Winkler
Summary: The effects of vacuum annealing on the magnetotransport properties of iron oxide nanoparticles are investigated. High temperature treatment reduces the electrical resistivity and induces surface oxidation. The tunnel barrier width decreases with increasing annealing temperature, leading to a reduction in interparticle magnetoresistance.
Article
Polymer Science
Rabia Baby, Mohd Zobir Hussein, Abdul Halim Abdullah, Zulkarnain Zainal
Summary: Nanotechnology is widely applied in various fields and can help solve environmental problems such as water contamination. Non-carbon nanomaterials have advantages in heavy metal contaminated water and environmental remediation, with great potential for applications.
Article
Chemistry, Multidisciplinary
Tomas Solny, Petr Ptacek, Tomas Opravil, Lucie Dlabajova, Matej Brezina, Jiri Masilko, Jiri Svec, Rajan Ambat
Summary: In this study, nanosized iron oxide particles were synthesized via one-step precipitation method, showing different shapes depending on the reaction time. Drying wet extracted particles at 60 degrees C led to a change in morphology. Different ratios of FeOOH and Fe3O4 were obtained based on the time of reaction. Characterization of particles was conducted using DTA - TGA, XRD, FTIR and SEM.
JOURNAL OF EXPERIMENTAL NANOSCIENCE
(2021)
Article
Chemistry, Physical
Andrea Atrei, Beata Lesiak-Orlowska, Jozsef Toth
Summary: The surface composition of magnetite nanoparticles, bare and functionalized with citrate, was investigated using XPS and ToF-SIMS. The results showed that the oxide composition was not modified by the citrate functionalization. The amount of citrate ions adsorbed on the surface was independent of the functionalization procedure. The citrate shell was found to be a single layer that only partially covered the nanoparticle surface. Additionally, the presence of ammonia molecules from the Fe(II) salt used in the nanoparticle preparation was detected.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Haiyang Jia, Fen Zhang, Chen Zhu, Jiawei Sun, Xiao Xie
Summary: This study synthesized amino-grafted ferromagnetic nanoparticles with highly stable dispersion using deep-eutectic-solvent electrolysis, and successfully applied them in magnetic resonance imaging. These nanoparticles exhibited high biocompatibility and had high longitudinal and transverse relaxation efficiencies, enabling prominent weighted imaging of T1 and T2 of the liver, as well as significant distinction between normal tissue and liver tumors.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
Chu Shi, Jingyi Sheng, Guangxiang Si, Yan Li, Yan Shen, Ning Gu
Summary: This study developed a method based on Spy chemistry for rapid and stable protein immobilization on small-sized iron oxide nanoparticles (IONPs). The SpyCatcher peptide was coated on the IONPs surface through cross-linking with activated groups, and then the SpyTag peptide fused with a model protein (EGFP) was directly coupled to the SpyCatcher-modified IONPs by self-assembly. This strategy provides a simple and efficient approach for protein immobilization on IONPs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Francesca Brero, Paolo Arosio, Martin Albino, Davide Cicolari, Margherita Porru, Martina Basini, Manuel Mariani, Claudia Innocenti, Claudio Sangregorio, Francesco Orsini, Alessandro Lascialfari
Summary: We investigated the effect of different organic coatings on the H-1-NMR relaxation properties of ultra-small iron-oxide-based magnetic nanoparticles. Magnetization measurements revealed similar behavior as a function of temperature and field for nanoparticles with different coatings but the same core diameter. However, the H-1-NMR longitudinal relaxivity showed different intensity and frequency behavior for the smallest particles depending on the kind of coating, indicating different electronic spin dynamics. On the other hand, no differences were found in the relaxivity of the biggest particles when the coating was changed.
Article
Chemistry, Physical
Alexander Omelyanchik, Franciscarlos Gomes da Silva, Guilherme Gomide, Ivan Kozenkov, Jerome Depeyrot, Renata Aquino, Alex Fabiano Cortez Campos, Dino Fiorani, Davide Peddis, Valeria Rodionova, Sonja Jovanovi
Summary: The study investigated the structural and magnetic properties of iron oxide nanoparticles obtained by the precipitation of iron ions in the presence of different amounts of citric acid. It was found that the particle size plays a crucial role in determining the magnetic properties, with smaller particles showing reduced saturation magnetization and increased coercivity due to the increasing role of the disordered surface. The observation of superspin-glass freezing, memory effects, and exchange bias in smaller particles provides evidence of unique magnetic behaviors at the nanoscale.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Engineering, Environmental
Alice G. Leonel, Alexandra A. P. Mansur, Herman S. Mansur
Summary: The rapid industrialization and population growth have led to an unprecedented demand for safe, reliable, and cost-effective water supply, with the application of nanotechnology showing promise in water treatment and pollution cleanup, particularly the use of MIONs for environmental remediation. Despite concerns about nanotoxicity and environmental risks, the development of green synthesis strategies and risk assessment are vital for expanding the applications of iron oxide-based nanomaterials. This critical review contributes to the emerging knowledge on the toxicity of MIONs and highlights the potential improvements in water treatment and pollution control using advanced iron oxide-based hybrid nanostructures.
Article
Chemistry, Multidisciplinary
Elena-Alina Moaca, Claudia-Geanina Watz, Vlad Socoliuc, Roxana Racoviceanu, Cornelia Pacurariu, Robert Ianos, Simona Cinta-Pinzaru, Lucian Barbu Tudoran, Fran Nekvapil, Stela Iurciuc, Codruta Soica, Cristina-Adriana Dehelean
Summary: This study presents a method for preparing a highly stable and biocompatible magnetic colloidal suspension, which has significant effects on breast adenocarcinoma cells in hyperthermia treatment, while exhibiting minimal impact on non-tumorigenic cells. Further research is needed to explore the clinical biological potential of the synthesized magnetic colloidal suspension for magnetically triggered hyperthermia.
Article
Chemistry, Physical
Y. Jiraskova, J. Bursik, O. Zivotsky, J. Lunacek, P. Alexa, R. Uhlar, J. Ederer, P. Janos
Summary: Magnetite and magnetite/ceria composites were prepared using chemical methods and underwent calcination treatment. The ceria content and calcination temperature were found to greatly affect the degradation ability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Enzo Bertuit, Emilia Benassai, Guillaume Meriguet, Jean-Marc Greneche, Benoit Baptiste, Sophie Neveu, Claire Wilhelm, Ali Abou-Hassan
Summary: Magnetite and maghemite multicore nanoflowers synthesized using modified polyol-mediated routes are highly effective nanoheaters in magnetic hyperthermia (MHT) and have also shown promising performances in photothermal therapy (PT) in the NIR-II biological window. The study investigates the influence of synthesis parameters on the size, shape, composition, cores, and crystallinity of the nanoflowers, establishing correlations between their structure, properties, and function in MHT and PT. Iron(III) and heating ramps are found to play a critical role in the formation of well-defined nanoflowers with multiple cores, with optical responses and photothermal properties depending on volume and structural disorder rather than stoichiometry. Defect concentration in the nanostructures affects optical behavior, with a transition in photothermal efficiency observed at a critical Urbach energy value.
Article
Nanoscience & Nanotechnology
Yilian Fernandez-Afonso, Laura Asin, Lilianne Beola, Raluca M. Fratila, Lucia Gutierrez
Summary: This study investigates how the transformations of magnetic nanoparticles in vivo affect their heating properties in hyperthermia treatments. Iron oxide magnetic nanoparticles with two different coatings were subjected to accelerated degradation to simulate lysosome conditions. The degradation process was monitored for 24 days, revealing that DMSA-coated particles degraded faster than PMAO-coated ones. Changes in physicochemical properties were found to impact the heating capacity under an alternating magnetic field or near infrared light. Additionally, intratumoral administration of PMAO-coated particles showed no significant changes in size and size distribution over time. This research is particularly relevant for the design of in vivo hyperthermia treatments using magnetic nanoparticles.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Marco Sanna Angotzi, Valentina Mameli, Shankar Khanal, Miroslav Veverka, Jana Vejpravova, Carla Cannas
Summary: In this study, the effect of different molecular coatings on the heating properties of maghemite nanoparticles in water dispersions was investigated. It was found that surface modification through intercalation processes induced particle clustering, leading to reduced heating performance. Understanding the evolution of SPA and ILP over time and temperature provided a broader comprehension of the heating phenomenon in this dynamic system.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Physical
Natercia C. T. Martins, Sara Fateixa, Tito Trindade
Summary: In this study, hydrophobic paper-based SERS substrates with high reproducibility and uniformity were fabricated by inkjet printing Ag colloidal nanoparticles (NPs) on office paper pre-treated with chitosan (CH) or N,N,N-trimethyl chitosan (TMC). Coating the paper with these biopolymers substantially improved the SERS performance of the paper substrates. Crystal violet (CV) 100 µM was used as a molecular probe, and an increase of about 9-fold and 7-fold in the observed SERS intensity was observed when the papers were coated with CH and TMC, respectively. The coated substrates also showed improved reproducibility compared to non-coated office paper.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Analytical
Sara Fateixa, Otilio Mulandeza, Helena I. S. Nogueira, Tito Trindade
Summary: The applicability of Raman imaging extends to various aspects of pharmaceutical production, such as characterizing pharmaceutical formulations, monitoring drug delivery processes, and detecting counterfeit drugs or contaminants. This study investigates the use of Raman imaging to characterize the main components of commercial APAP tablets and identify the presence of 4-aminophenol (4-AP) as a contaminant. The results show that Raman imaging is capable of detecting small amounts of 4-AP in APAP tablets, suggesting its potential in characterizing APAP products.
VIBRATIONAL SPECTROSCOPY
(2023)
Review
Biotechnology & Applied Microbiology
Diogo Marinheiro, Fatima Martel, Barbara J. M. L. Ferreira, Ana L. L. Daniel-da-Silva
Summary: Diabetes mellitus, a global epidemic, is associated with serious health threats including cardiovascular diseases. Current treatments have limitations, driving the development of new effective formulations. Silica-based nanocarriers show potential for treating diabetes and regulating blood glucose concentration due to their tunable characteristics. This review discusses topics such as oral insulin administration, glucose-responsive devices, and innovative drug delivery routes.
BIOENGINEERING-BASEL
(2023)
Article
Materials Science, Ceramics
Sofia F. Soares, Ana L. Daniel-da-Silva, Tito Trindade
Summary: This study demonstrates the successful modification of hybrid siliceous materials with transition metals (TM = Co2+, Ni2+, Cu2+, Zn2+) using a sol-gel method with the polysaccharide kappa-carrageenan as a precursor. Structural analysis and characterization studies were conducted, and the effects of the TM ions on the properties of the hybrids were assessed. The results show that the modification with TM induces changes in the morphological, optical, and thermal properties of the hybrids compared to the unmodified analogs, indicating the practical applicability of the sol-gel method for modifying the properties of host particles.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Luiza R. Melo de Lima, Ana C. Dias, Tito Trindade, Jose M. Oliveira
Summary: The circulation of motor vehicles with an exhaust system is a major cause of pollution, and countries are making efforts to achieve a sustainable level of air quality and limit CO2 emissions. There is significant interest in developing technological innovations such as alternative fuels and lighter thermoplastic composites for auto applications. A comparative LCA of PP-based GnPs nanocomposite and PP/GF composite for automotive applications showed that using nanocomposites can reduce the environmental impact caused by auto parts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Chemistry, Multidisciplinary
Mariana Sell, Ana Rita Lopes, Maria Escudeiro, Bruno Esteves, Ana R. Monteiro, Tito Trindade, Luisa Cruz-Lopes
Summary: Timely diagnosis and appropriate antitumoral treatments are crucial in combating cancer, which remains a leading cause of death globally. Nanotechnology provides benefits in cancer therapy by reducing adverse effects and enabling targeted drug delivery to cancer cells. This comprehensive review summarizes recent advancements (2010-2023) in the design and application of nanosystems for cancer therapy, covering various classes of nanoparticles and their role in drug delivery, tumor microenvironment, and vasculature. The review also compares strategies for passive and active targeting of nanoparticles and emphasizes their importance in cancer theranostics.
Article
Crystallography
Yasmine Fernine, Natercia C. T. Martins, Mustapha Taleb, Tito Trindade
Summary: Green chemical routes for the synthesis of colloidal metal nanocrystals have attracted great interest in the field of nanosciences and biological applications. Among these methods, the synthesis of metal colloids using medicinal plant extracts has shown promise in producing nanocrystals with surfaces modified by biologically derived compounds, which can be further explored for pharmaceutical purposes. Therefore, the development of spectroscopic methods to understand the potential benefits of using formulations containing natural compounds and therapeutic metal nanoparticles is of great relevance.
Article
Chemistry, Multidisciplinary
Ana R. Monteiro, Catarina I. V. Ramos, Sara Fateixa, Maria G. P. M. S. Neves, Tito Trindade
Summary: This study reports a novel approach to construct arrays of ethylenediamine-modified graphene quantum dots (GQDs) and DNA oligonucleotides that can fold into different G-quadruplex structures, optimizing the efficiency of drug delivery for targeted clinical therapies.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Analytical
Maria Antonio, Tania Lima, Rita Ferreira, Margarida Fardilha, Jose Mesquita Bastos, Rui Vitorino, Ana. L. Daniel-da-Silva
Summary: In this study, a colorimetric and low-cost approach for detecting and quantifying Gal-3 using gold nanoparticles bioconjugated with Gal-3 antibody was developed. The method showed a linear response of the absorbance ratio to Gal-3 concentration, accompanied by a change in color intensity. It provided faster results and was more cost-effective compared to conventional detection techniques.
ANALYTICAL METHODS
(2023)
Article
Materials Science, Multidisciplinary
Stanley Udochukwu Ofoegbu, Mario Guerreiro Silva Ferreira, Helena I. S. Nogueira, Mikhail Zheludkevich
Summary: In this study, the electrochemical responses and activities towards oxygen reduction reactions (ORR) of carbon-fiber-reinforced polymers (CFRP), glassy carbon, and Highly Ordered Pyrolytic Graphite (HOPG) were evaluated and ranked. The ranking of their activities in supporting cathodic reactions that can lead to galvanic corrosion on coupling with metallic materials is as follows: CFRP > glassy carbon > HOPG. The differences in the electrochemical responses of these carbon surfaces to ORR are postulated to be due to differences in the proportions of edge sites present on each carbon surface.
C-JOURNAL OF CARBON RESEARCH
(2023)
Article
Chemistry, Analytical
Natercia C. T. Martins, Sara Fateixa, Helena I. S. Nogueira, Tito Trindade
Summary: Fast detection of emerging contaminants in water resources is of great environmental interest. This study explores the application of chitosan-coated paper and silver nanoparticles for surface-enhanced Raman scattering (SERS) spectroscopy studies of two types of contaminants. The results show that the biocoated substrates have superior SERS performance compared to non-coated paper and successfully detect thiram and ciprofloxacin.
Article
Chemistry, Physical
Joana L. Lopes, Ana C. Estrada, Sara Fateixa, Nikolai A. Sobolev, Ana L. Daniel-da-Silva, Tito Trindade
Summary: This research focuses on finding a green chemical strategy to enhance the sustainability of bismuth vanadate for photocatalytic water purification. By hydrothermal carbonization of kappa-carrageenan, a biopolymer derived from red seaweeds, monoclinic BiVO4 supported on carbon spheres is successfully prepared. These hybrid materials exhibit visible-light photocatalytic activity for the removal of tetracycline in water. They possess appropriate wavelength range for photon absorption, good adsorption capacity, durability, and the ability to be reused in subsequent catalytic steps, making them cost-effective and sustainable.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Sofia F. Soares, Joao Nogueira, Tito Trindade, Ana L. Daniel-da-Silva
Summary: Efficient removal of the antibiotic ciprofloxacin from aqueous samples using magnetic nanosorbents prepared with sulfated polysaccharides was described. The nanosorbents exhibited high adsorption capacity and could be reused.
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2023)
