Article
Chemistry, Physical
T. Rafique, M. Atif, Atta Ur Rehman, H. Wahab, W. Khalid, Z. Ali, M. Nadeem
Summary: Zinc substituted manganese ferrites were synthesized using the citrate sol-gel route, and their structure, stoichiometry, and properties were analyzed. The results showed that zinc substitution led to samples with excellent resistive and dielectric properties, making it suitable for radar absorbing applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Leodoro P. dos Santos Filho, de F. P. Maria P. Nascimento, Liziane Marcal, Katia J. Ciuffi, Marcio L. A. e Silva, Eduardo J. Nassar, Lucas A. Rocha
Summary: The sol-gel process is an interesting strategy to obtain hybrid materials, with mesoporous silica showing large specific area and pore volume, and demonstrating efficient antimicrobial properties. Mesoporous silica matrixes prepared via the sol-gel process using surfactants and copolymers as structure-driving agents showed the most significant effects in the study.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
J. J. Mikolei, D. Richter, R. Pardehkhorram, C. Helbrecht, S. Schabel, T. Meckel, M. Biesalski, M. Ceolin, A. Andrieu-Brunsen
Summary: Introduces the importance of mesopores in paper, which not only increase the specific surface area, but also have specific properties such as capillary fluid transport and ion specific pore accessibility. Investigates mesopore formation in paper using sol-gel chemistry and evaporation induced self-assembly, and discusses the influence of solvent evaporation rate and capillary fluid velocity on mesopore formation.
Article
Polymer Science
Dan Eduard Mihaiescu, Daniela Istrati, Alina Morosan, Maria Stanca, Bogdan Purcareanu, Rodica Cristescu, Bogdan Stefan Vasile, Roxana Doina Trusca
Summary: This research focuses on the study of cefotaxime absorption and desorption from different functionalized mesoporous silica supports to obtain new materials with sustained release properties. The MCM-41-type nanostructured mesoporous silica support was synthesized and characterized, showing good micro-structured homogeneity, high surface area, and high silanolic activity. Functionalization of the support was conducted to effectively link the cefotaxime compound. The release experiments revealed significant improved release capacity in the functionalized mesoporous silica support.
Article
Materials Science, Ceramics
Otavio Rovere Bittencourt, Ingrid Vicente Farias, Flavio Henrique Reginatto, Leliz Ticona Arenas, Herica Aparecida Magosso, Alexandre Luis Parize
Summary: The presence of micropollutants in springs in Brazil and other countries has been detected. This study reports the synthesis and characterization of a xerogel-based adsorbent for the removal of the emerging contaminant ethinylestradiol. The adsorbent showed high adsorption capacity, thermal stability, and good regeneration ability.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Genis Vanheusden, Harold Philipsen, Sebastiaan J. F. Herregods, Philippe M. Vereecken
Summary: This study demonstrates the importance of diffusion layer control using a rotating disk electrode to produce aggregate-free films in a wide thickness range (11-2500 nm). Factors such as electrode rotation rate, deposition time/charge, current, and temperature were found to affect the deposition rate.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Surbhi Grewal, Pravesh Kumar, Saonli Roy, Indu Bala, Chitranjan Sah, Santanu Kumar Pal, Sugumar Venkataramani
Summary: This study reports two tripodal C-3-symmetric molecular systems with extended conjugation and explores the influence of the extended pi-bonds on their absorption properties, thermal relaxation of the photoisomers, and propensity for self-assembly. The position of the acryl group is found to significantly impact the behavior and self-assembly of the molecules.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Raju Kumar Sharma, Gobinda Dey, Pritam Banerjee, Jyoti Prakash Maity, Chung-Ming Lu, Shau-Chun Wang, Yi-Hsun Huang, Pin-Yun Lin, Yung-Ping Chen, Chien-Yen Chen
Summary: This study investigated the synthesis of mesoporous silica nanoparticles using four different surfactants. The outcomes showed that Tween-80 and biosurfactant produced interesting results compared to CTAB and SDS-mediated silica nanoparticles.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Biochemistry & Molecular Biology
Tatyana G. Khonina, Alexander M. M. Demin, Denis S. S. Tishin, Alexander Yu. Germov, Mikhail A. A. Uimin, Alexander V. V. Mekhaev, Artem S. S. Minin, Maxim S. S. Karabanalov, Alexey A. A. Mysik, Ekaterina A. A. Bogdanova, Victor P. P. Krasnov
Summary: Novel magnetic nanocomposite materials based on Fe3O4 nanoparticles coated with iron and silica glycerolates were synthesized and characterized. These materials exhibited high magnetization values and strong magnetic response to alternating magnetic field, and the silica glycerolates shell could undergo hydrolysis in aqueous media. Additionally, the materials showed no cytotoxicity in in vitro experiments, suggesting their potential for controlled-release drug delivery.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Rafael Balderas-Xicohtencatl, Hung-Hsuan Lin, Christian Lurz, Luke Daemen, Yongqiang Cheng, Katie Cychosz Struckhoff, Remy Guillet-Nicolas, Gisela Schutz, Thomas Heine, Anibal J. Ramirez-Cuesta, Matthias Thommes, Michael Hirscher
Summary: This study uses high-resolution cryo-adsorption studies and characterization by inelastic neutron scattering vibration spectroscopy to discover that hydrogen adsorbed on well-ordered mesoporous silica forms a super-dense two-dimensional monolayer near its boiling point. The formation of this super-dense phase is rationalized through theoretical studies based on first-principles calculations.
Article
Chemistry, Physical
Xavier Cattoen, Stephanie Kodjikian, Philippe Trens
Summary: The synthesis of various periodic mesoporous organosilica nanoparticles (nanoPMOs) from organo-bridged bis(triethoxy)silanes is described. The influence of sodium hydroxide concentration on the size and morphology of the nanoparticles is observed. Comparison of the resulting hybrid nanoPMOs reveals significant differences in their adsorption properties towards rhodamine B (RB) and highlights the strong affinity of phenylene PMO with the dye. Additionally, it is found that the phenylene-bridged nanoPMO exhibits higher lipophilicity compared to other studied linkers.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
A. Bordoni, M. Lombardo, A. Wolosiuk
Summary: In this study, the use of microwave radiation as a postsynthesis treatment for expanding the pore size of non-calcined SiO2-based mesoporous materials was analyzed. Compared to traditional hydrothermal treatments, microwave irradiation significantly reduces the processing time and is compatible with various surfactant pore templates. This approach allows for easy postprocessing of non-calcined templated siliceous materials and customization of their final pore dimensions.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Environmental Sciences
Devaraj Manoj, Lalitha Gnanasekaran, Saravanan Rajendran, A. A. Jalil, Mohammad Nahid Siddiqui, F. Gracia, Matias Soto-Moscoso
Summary: The subject of water contamination and its impact on society and humans has been a topic of discussion for several decades. Phenolic compounds are widely found in water sources and it is crucial to determine their toxicity in natural and drinking water due to their harmful effects on humans. This study focuses on the development of an effective electrochemical sensor using a mesoporous structure of Fe3O4-TiO2 decorated on a glassy carbon electrode to detect catechol. The resulting Fe3O4-TiO2 based nanocomposite exhibited a mesoporous structure with highly active magnetite nanoparticles, showing a significant increase in the electrochemical response compared to pure TiO2.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Inorganic & Nuclear
Ramunas Diliautas, Aldona Beganskiene, Dovydas Karoblis, Kestutis Mazeika, Dalis Baltrunas, Aleksej Zarkov, Rimantas Raudonis, Aivaras Kareiva
Summary: In this study, BiFe1-xMnxO3 solid solutions were prepared by low temperature sol-gel processing, and it was found that the structural, magnetic and morphological properties of the samples are dependent on the chemical composition, with monophasic samples formed up to 25 mol% of substitution. The study also investigated the thermal behavior of the precursor gels, as well as the magnetic properties of the solid solutions, observing antiferromagnetism and weak ferromagnetism in the samples.
SOLID STATE SCIENCES
(2021)
Article
Chemistry, Physical
Adil Alshoaibi, Shumaila Islam
Summary: Sol-gel-based titania nanoparticles, Silica-titania nanocomposite, and zinc supported silica-titania nanocomposites were synthesized at low temperature. The study showed that zinc nanoparticles were homogeneously distributed in the silica-titania nanocomposite, and the doping of zinc enhanced the photocatalytic activity of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biochemistry & Molecular Biology
Laszlo Almasy, Oleksandr P. Artykulnyi, Viktor Petrenko, Oleksandr I. Ivankov, Leonid A. Bulavin, Minhao Yan, Vasil M. Haramus
Summary: Aqueous solutions of polyethylene glycol were studied using small-angle neutron scattering. The results showed that polyethylene glycol behaves like a random coil at physiological temperature. This study provides reference for the description of complex mixtures with polyethylene glycol used in various applications.
Article
Materials Science, Composites
Roland Petreny, Laszlo Almasy, Laszlo Meszaros
Summary: This study investigated the dispersion of carbon nanotubes and the interphases formed around them in nanocomposites and hybrid composites. The results showed that carbon fibers effectively increased the dispersion of carbon nanotubes, leading to smaller aggregates. Additionally, the larger interphase fraction in the hybrid composites resulted in better mechanical performance.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Khursand E. Yorov, Andrey P. Zhdanov, Rustam Kh Kamilov, Alexander E. Baranchikov, Gennady P. Kopitsa, Oleg Pokrovskiy, Anton L. Popov, Olga S. Ivanova, Laszlo Almasy, Yury G. Kolyagin, Konstantin Yu Zhizhin, Vladimir K. Ivanov
Summary: A SiO2 aerogel material with high specific surface and open porosity, containing a closo-decaborate moiety, was successfully synthesized and showed excellent neutron capture properties. The borylated aerogel demonstrated pronounced dose-dependent toxicity towards malignant cells and low toxicity towards normal cells, making it a potential candidate for shielding in boron neutron capture therapy procedures.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Patricia Jovicevic-Klug, Levi Tegg, Matic Jovicevic-Klug, Rahul Parmar, Matteo Amati, Luca Gregoratti, Laszlo Almasy, Julie M. Cairney, Bojan Podgornik
Summary: The study investigates the effect of deep cryogenic treatment (DCT) on a high-alloyed ferrous alloy and its effectiveness on carbide evolution and chemical shifts of alloying elements. With ex-situ and in-situ observations ranging from the microscopic to the nanoscopic level, the researchers uncover the atomistic mechanism by which DCT affects carbide precipitation, resulting in a 50% increase in carbide volume fraction. Mo plays a crucial role in DCT through its modification of chemical bonding states, which is postulated to originate from the loosely-formed primordial Mo2C carbides formed during exposure to cryogenic temperatures.
APPLIED SURFACE SCIENCE
(2023)
Article
Polymer Science
Olga Kuzminskaya, Sven Riemer, Robert Dalgliesh, Laszlo Almasy, Ingo Hoffmann, Michael Gradzielski
Summary: By combining oppositely charged PDADMAC and NaPA, interpolyelectrolyte complexes (IPECs) can be formed in aqueous solution. The addition of a hydrophobic modification to NaPA makes the complexes more hydrophobic, resulting in lower precipitation ratios and wider biphasic regions. The soluble IPECs have cylindrical hydrophobic domains arranged within larger clusters, with the size of the clusters decreasing with reduced length of PDADMAC chains. The structure of the IPECs is largely determined by the hydrophobic modification of NaPA and can be potentially used as delivery systems with variable polarity domains.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Paper & Wood
Arianna Rossetti, Alessandro Paciaroni, Barbara Rossi, Cettina Bottari, Lucia Comez, Silvia Corezzi, Lucio Melone, Laszlo Almasy, Carlo Punta, Andrea Fiorati
Summary: Hydrogels made from renewable biopolymers and low-cost row materials have gained attention in biomedical applications. In this study, the sol-gel transition of TEMPO-oxidized nano-sized cellulose fibrils (TOCNFs) in the presence of polyvalent cations (Mg2+ and Ca2+) was investigated using multiple techniques. The results showed that ion concentration induced anisotropic swelling and increased flexibility in the nanofibrils, and the flexibility was also affected by the concentration of TOCNFs and the pH value. UV Resonant Raman spectroscopy revealed the structural organization and hydrogen-bonding properties of water in TOCNF dispersions and gels.
Article
Chemistry, Physical
Vladimer Mikelashvili, Shalva Kekutia, Jano Markhulia, Liana Saneblidze, Nino Maisuradze, Manfred Kriechbaum, Laszlo Almasy
Summary: Colloidal suspensions of Fe3O4 nanoparticles coated with citric acid were obtained by chemical co-precipitation of ferrous and ferric salts at a 1:1.9 stoichiometric ratio in NH4OH base with ultrasonication. Electrohydraulic discharges and pulsed direct current were used for processing the nanoparticles before coating. The developed method showed higher citric acid coverage and better particle dispersion, making it suitable for nanoparticle synthesis in biomedical applications.
Article
Chemistry, Physical
Giuseppe Conte, Cataldo Simari, Ana-Maria Putz, Carlo Poselle Bonaventura, Michele Porto, Giovanni Desiderio, Raffaele G. Agostino, Alfonso Policicchio
Summary: The results of this study provide guidance for the future design of low-cost and high-performance functionalized mesoporous silica using cationic surfactants as directing agents. The tuning of surface interactions and textural characteristics can improve the efficiency of H2 capture processes. Experimental results show that the (3-Aminopropyl)triethoxysilane precursor has better interaction. NMR investigation reveals the internal arrangement and diffusion properties of hydrogen molecules in functionalized porous silica materials, with two different diffusion mechanisms observed in functionalized mesoporous silica.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Biochemistry & Molecular Biology
Oleksandr P. Artykulnyi, Katarina Siposova, Manfred Kriechbaum, Andrey Musatov, Laszlo Almasy, Viktor Petrenko
Summary: The structure and interaction parameters of water-soluble cholesterol-based surfactant Chobimalt were studied using small-angle neutron and X-ray scattering techniques. The analysis revealed the formation of polydisperse spherical or moderately elongated ellipsoidal micelles with hard sphere interaction. The aggregation numbers were estimated to be in the range of 200-300, and the low pH had no noticeable effect on the micelle structure. The critical micelle concentrations of Chobimalt in water and H2O-HCl solutions were determined to be around 3 μM and 2.5 μM, respectively. In-depth understanding of the detergent micelle's structural properties is crucial for applications in bioscience and biotechnology.
Article
Chemistry, Multidisciplinary
Yan Zhou, Jing Shi, Mark Julian Henderson, Xiuhong Li, Feng Tian, Xiaohui Duan, Qiang Tian, Laszlo Almasy
Summary: Sequential ultra-small-angle and small-angle X-ray scattering measurements were conducted to investigate the microstructure evolution of TATB under applied pressure. The results showed the presence of three different populations of voids with varying sizes. The response of structural parameters indicated that the main densification mechanisms of TATB during compaction were flow, fracture, and plastic deformation.
Article
Pharmacology & Pharmacy
Jano Markhulia, Shalva Kekutia, Vladimer Mikelashvili, Liana Saneblidze, Tamar Tsertsvadze, Nino Maisuradze, Nino Leladze, Zsolt Czigany, Laszlo Almasy
Summary: In this study, the cytotoxicity of doxorubicin-loaded magnetic nanofluids on tumor cells was investigated. The synthesized superparamagnetic iron oxide nanoparticles exhibited strong magnetic properties and sedimentation stability. The combination of the drug and magnetic nanosystem showed promising potential for targeted drug delivery and enhanced cytotoxic effects on cancer cells. The findings suggest a novel approach for improving the therapeutic efficacy of anticancer drugs.
Article
Biochemistry & Molecular Biology
Carmen Cretu, Roxana Nicola, Sorin-Alin Marinescu, Elena-Mirela Piciorus, Mariana Suba, Corina Duda-Seiman, Adel Len, Levente Illes, Zsolt Endre Horvath, Ana-Maria Putz
Summary: Zr-based metal-organic framework materials with increased specific surface area and pore volume were synthesized using chemical and solvothermal methods. The materials were characterized and investigated for their potential as drug carriers for controlled drug release, showing enhanced drug-loading capacity and good drug delivery results.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Petra Herman, Daniel Percsi, Tamas Fodor, Laura Juhasz, Zoltan Dudas, Zsolt E. Horvath, Vasyl Ryukhtin, Ana-Maria Putz, Jozsef Kalmar, Laszlo Almasy
Summary: A simplified sol-gel method was developed to synthesize thiol functionalized porous silica particles, which exhibited highly effective sorption capacity and selectivity towards aqueous Ag(I).
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Crystallography
Lucia Balejcikova, Kristyna Zolochevska, Natalia Tomasovicova, Anatolii Nagornyi, Oleksandr Tomchuk, Viktor I. Petrenko, Vasil M. Garamus, Laszlo Almasy, Milan Timko, Peter Kopcansky
Summary: Iron-based materials, especially magnetite nanocrystals, have been widely used in various fields. Understanding the interactions between magnetite and biological macromolecules is crucial for the development of applications in medicine.
