Article
Chemistry, Multidisciplinary
Ana B. Pinar, Przemyslaw Rzepka, Amy J. Knorpp, Lynne B. McCusker, Christian Baerlocher, Thomas Huthwelker, Jeroen A. van Bokhoven
Summary: Resonant X-ray powder diffraction technique is used to accurately determine the distribution of aluminum in different zeolite catalysts, leading to a better understanding of the relationship between zeolite structure and catalytic activity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Sarodi Jonak, J. P. Borah
Summary: The study shows that annealing Fe3O4 nanoparticles at different temperatures can modulate structural and magnetic parameters, ultimately optimizing the heating efficiency for magnetic hyperthermia applications. Confirmation of cation migration was obtained through XRD peak intensity and FTIR study, while crystallite sizes were found to decrease with heat treatment. This research highlights the importance of particle size and magnetic anisotropy in enhancing the heating efficiency of Fe3O4 nanoparticles.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Applied
Hyun Seung Jung, Nguyen Thi Xuan, Jong Wook Bae
Summary: The distribution and location of coke precursors on seed-derived crystalline FERs impact catalytic stability. The distribution of coke precursors on active Bronsted acid sites is influenced by FER crystallinity. By controlling seed content to minimize coke deposition on external surfaces, the deactivation rate of FERs can be reduced.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Materials Science, Ceramics
Xiangchun Yin, Jianguo Huang, Wenjun Zhang, Kaiwen Xiong, Zehao Xu, Yuantao Zhang
Summary: In this study, nanosubmicron blue-green pigment powder was synthesized and its crystal structure, morphology, and color parameters were investigated. The results showed that the distribution of cations in the crystal structure was disordered and changes in the calcining atmosphere affected the oxygen vacancy content in the structure. The color difference of the synthesized pigment powder was related to the occupation of chromophore ions and the number of oxygen vacancies.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Zhiping Xiong, Guodong Qi, Luyi Bai, Ensheng Zhan, Yueying Chu, Jun Xu, Na Ta, Aijing Hao, Feng Deng, Wenjie Shen
Summary: Hydrothermal synthesis of ZSM-35 using dioxane as the structure-directing agent resulted in the majority of aluminum atoms located at the T4 site, generating efficient Brønsted acid sites for the carbonylation of dimethyl ether.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Agronomy
Tahir Muhammad, Yang Xiao, Jaume Puig-Bargues, Wenchao Liu, Zeyuan Liu, Xiuzhi Chen, Yunkai Li
Summary: This study investigates an effective approach to overcome CaCO3 fouling issues in saline water irrigation systems by adjusting shear stress, temperature, and ions. Results show that the fouling rate of CaCO3 varied under different conditions, with shear stress having a significant impact on the fouling rate.
AGRICULTURAL WATER MANAGEMENT
(2021)
Article
Materials Science, Ceramics
Xiangchun Yin, Jianguo Huang, Zidie Pu, Jinfeng Li, Hao Feng, Xiaoyang Wang, Yiqun Wang
Summary: This study investigates the color modification mechanism of a blue-green pigment by analyzing the cation distributions in the spinel structure and the effects of calcination temperature, providing insights into the factors influencing pigment hue.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Ryosuke Yamagata, Junya Nakamura, Takaomi Itoi, Masao Takeyama, Kyosuke Yoshimi
Summary: This study examined the site-occupation behavior of Al and Cr in Fe2Nb Laves phases and their effects on lattice parameters and the c/a axial ratio. The results showed that Al and Cr preferentially occupied Fe sites in stoichiometric Fe2Nb, while they could occupy both Fe and Nb sites in Fe-rich alloys. The change in lattice parameters could not be solely explained by the concentration of the added element.
MATERIALS CHARACTERIZATION
(2023)
Article
Biochemistry & Molecular Biology
K. Vignesh, D. Sivaganesh, S. Saravanakumar, M. Prema Rani
Summary: The synthesis and characterization of Zn1-xHoxO (X= 0, 0.02, 0.04, 0.06, and 0.08) materials were investigated. It was found that ZnO with 6% Ho3+ doping exhibited the best performance.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2023)
Article
Chemistry, Inorganic & Nuclear
K. Chinnaiah, Karthik Kannan, D. Sivaganesh, K. Gurushankar
Summary: In this study, Ag/NiO nanocomposite was synthesized using the medicinal plant Withania somnifera leaf extract. The nanocomposite exhibited reduced bandgap and smaller particle size, which enhanced its electrochemical properties. The synthesized material was used as an electrode material for supercapacitor applications and showed specific capacitance of 293 F/g with good cyclic stability.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
D. Sivaganesh, S. Saravanakumar, V Sivakumar, S. Sasikumar, J. NandhaGopal, Rajajeyaganthan Ramanathan
Summary: A high intensity 464 nm excitable ZnWO4:Eu(3+) red-emitting phosphor was successfully prepared with excellent photoluminescence properties and surface morphology variations based on different Eu(3+) concentrations. The 4% Eu3+-doped ZnWO4 exhibited the best photoluminescence properties, making it suitable for lighting applications with its high intensity excitation at 395 and 464 nm followed by red emission.
Article
Chemistry, Applied
Shibin Thundiyil, Sreekumar Kurungot, R. Nandini Devi
Summary: This study focuses on the importance of specificity in oxygen reduction and evolution reactions in bifunctional catalysts for advanced energy devices. It discusses the issues with noble metal catalysts and the potential for metal oxides to provide better bifunctional activity. By exploiting features such as catalytically active metals, redox centers, and oxygen vacancies in structured oxides, the study aims to enhance oxygen electrocatalytic activity. Results show that co-doping cobalt and cerium in Ba2In2O5 can lead to improved activity in oxygen electrocatalysis.
Article
Materials Science, Multidisciplinary
Deepshikha Shekhawat, Imteyaz Ahmad, P. K. Roy
Summary: This study successfully synthesized single-phase strontium hexaferrite using the sol-gel auto combustion method, and analyzed the substitution of transition metal ions, showing that the substitution of Co+3 significantly enhanced the magnetic properties of the ferrites.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Inorganic & Nuclear
J. S. Uribe-Chavira, G. Herrera-Perez, C. R. Santillan-Rodriguez, R. J. Saenz-Hernandez, J. A. Matutes-Aquino, M. C. Grijalva-Castillob
Summary: In this study, BaTiO3 ferroelectric powders were milled and sintered using plasma spark sintering. The milling process increased the weight fraction of the tetragonal phase and decreased the orthorhombic phase, resulting in an increase in lattice parameters. The Ti-O bond lengths increased with the Ti-polyhedral volume, due to enhanced microstrains and reduced crystallite size. The sintered ceramics showed opposite behavior in structural and microstructural parameters compared to the powders, potentially improving their piezoelectric properties.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Chemistry, Physical
Chandra Sekhar Beera, B. Dhanalakshmi, Sudhakar Jyothula, Avinash Vujji, S. Ramesh, B. Parvatheeswara Rao, Hussein. H. Hamdeh
Summary: Sol-gel autocombustion method was used to prepare Chromium-substituted Cobalt ferrite nanoparticles, and their structure and cationic distribution were studied using various analysis methods.
JOURNAL OF MOLECULAR STRUCTURE
(2024)
Article
Chemistry, Physical
Zihao Rei Gao, Salvador R. G. Balestra, Luis Gomez-Hortiguela, Jian Li, Carlos Marquez-Alvarez, Miguel A. Camblor
Summary: The chiral zeolite STW has been successfully synthesized using a large dication with three aromatic rings. The presence and structure of the occluded organics in the zeolite are confirmed by various experimental techniques. Molecular simulations provide insights into the location and interactions of the aromatic rings in the cavities, and their blocking effect on certain pores. The study also discusses the implications of a structure-directing agent spanning three cavities.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Beatriz Bernardo-Maestro, Jian Li, Joaquin Perez-Pariente, Fernando Lopez-Arbeloa, Luis Gomez-Hortiguela
Summary: (1S,2S)-N-methyl-pseudoephedrine was used as OSDA for the synthesis of Mg-doped nanoporous aluminophosphates. This molecule has a unique conformational behavior. The incorporation of Mg into the framework is driven by the hydroxyl groups of the organic cation through the development of H-bonds.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Ramon de la Serna, David Nieto, Raquel Sainz, Beatriz Bernardo-Maestro, Alvaro Mayoral, Carlos Marquez-Alvarez, Joaquin Perez-Pariente, Luis Gomez-Hortiguela
Summary: Scientists reported the discovery of a new type of chiral zeolite material, GTM-3, with extra-large pores. This material demonstrated excellent enantioselectivity and the ability to catalyze reactions with bulky substrates. The researchers achieved unprecedented product enantiomeric excesses of up to 30% by catalyzing the epoxide aperture of transstilbene oxide with alcohols. This discovery opens new possibilities for the catalytic asymmetric synthesis of chiral pharmaceutical compounds using chiral zeolite materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Mercedes Boronat, Maria J. Climent, Patricia Concepcion, Urbano Diaz, Hermenegildo Garcia, Sara Iborra, Antonio Leyva-Perez, Lichen Liu, Agustin Martinez, Cristina Martinez, Manuel Moliner, Joaquin Perez-Pariente, Fernando Rey, Enrique Sastre, Pedro Serna, Susana Valencia
Summary: This article introduces the significant contributions of Prof. Avelino Corma in the field of heterogeneous catalysis and materials science. It highlights his remarkable achievements in areas such as solid catalysts, materials synthesis, and photochemistry. The article also emphasizes the importance of the research methods and paradigms developed by Avelino and his team in addressing new scientific challenges in building a sustainable world.
Article
Pharmacology & Pharmacy
Elizaura H. C. Silva, Elaine S. M. Cutrim, Monica R. C. Iemma, Hernane S. Barud, Alex Rojas, Luis Gomez-Hortiguela, Alan S. de Menezes, Enrique Rodriguez-Castellon, Auro A. Tanaka, Ana C. S. Alcantara
Summary: This study reports the intercalation of 5-Fluorouracil (5-FU) into 2D layered double hydroxides (LDH) through anion exchange, without the need for organic compounds or treatment. The combination of experimental characterizations and computational studies revealed three phases in the hybrid material, with two related to different charge states of the intercalated 5-FU and the third possibly related to distorted LDH. Interaction studies showed a complex network of hydrogen bonds, improving the chemical and thermal stability of the 5-FU-LDH hybrid. Release assays demonstrated selective drug release in simulated tumor microenvironment, and in vitro bioassays suggested dose-dependent behavior of the hybrid. These findings contribute to understanding the chemistry and potential applications of 5-FU-LDH in antitumor therapy.
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Inorganic & Nuclear
Huajian Yu, Alex Rojas, Zihao Rei Gao, Luis Gomez-Hortiguela, Luis A. Villaescusa, Jian Li, Jean-Louis Paillaud, Miguel A. Camblor
Summary: This study explores the synthesis of various zeolite phases using the organic structure-directing agent 2-isopropyl-1,3-dimethylimidazolium (2iPr13DMI). The obtained zeolite phases are influenced by factors such as water concentration, inorganic impurities, crystallization temperature and time, and germanium molar fraction. The study also involves molecular mechanics simulations and DFT calculations to understand the observed trends and chemical compositions of the zeolites.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Applied
Ramon de la Serna, Joaquin Perez-Pariente, Luis Gomez-Hortigueela
Summary: In this study, the asymmetric catalytic activity of GTM-3 chiral zeolite in the ring-opening reaction of trans-stilbene oxide using alcohols as nucleophiles was systematically explored. The results showed that a proper chiral host-guest size match is crucial for the chiral manifestation of the zeolite catalyst. Additionally, secondary alcohols with larger size exhibited higher enantioselectivity than their linear counterparts. Furthermore, variation of reaction conditions, such as the concentration of the epoxide and reaction temperature, could greatly influence the enantioselectivity and selectivity of the reaction.
Article
Chemistry, Applied
Alejandro Vidal de la Fuente, Amel Mekki, Bouhadjar Boukoussa, Marisol Grande-Casas, Enrique Sastre, Carlos Marquez-Alvarez, Manuel Sanchez-Sanchez, Joaquin Perez-Pariente
Summary: In this study, large-pore zeolite omega was treated with CTA to generate intracrystalline mesoporosity. The samples were characterized and it was found that dealumination and mild acid leaching are necessary for the formation of narrow-pore-diameter mesopores. The presence of mesopores enhances catalytic activity but does not improve selectivity.
Article
Chemistry, Multidisciplinary
Ramon de la Serna, Itziar Arnaiz, Carlos Marquez-Alvarez, Joaquin Perez-Pariente, Luis Gomez-Hortiguela
Summary: The chirality of the -ITV zeolite framework undergoes a surprising inversion when the ethyl group of the enantiopure N,N-ethyl-methyl-pseudoephedrinium organic structure-directing agent is replaced by a benzyl or 2-methylbenzyl group. Interestingly, chiral zeolite materials obtained with these new benzyl-containing cations exhibit unprecedentedly high enantiomeric excesses up to 55%.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Eddy Dib, Beatriz Bernardo-Maestro, Fernando Lopez-Arbeloa, Joaquin Perez-Pariente, Luis Gomez-Hortiguela
Summary: In this study, high-resolution H-1 MAS NMR was used to distinguish between two aggregation states of (1R,2S)-ephedrine occluded within AFI-type microporous aluminophosphates. The investigation focused on the supramolecular assembly of ephedrine molecules and the distances between aromatic rings and their closest protons inside the zeolite channels. The combination of two-dimensional spin diffusion spectra, molecular simulations, and DFT calculations allowed for precise estimation of these distances.
DALTON TRANSACTIONS
(2022)