Article
Chemistry, Physical
Vikram Singh Raghuwanshi, David Joram Mendoza, Christine Browne, Meri Ayurini, Gediminas Gervinskas, Joel F. Hooper, Jitendra Mata, Chun-Ming Wu, George P. Simon, Gil Garnier
Summary: This study focuses on the synthesis and characterization of thermo-responsive hydrogels based on poly(N-isopropylacrylamide) (PNIPAM)-grafted cellulose nanofibers (CNFs). The results show that grafting PNIPAM onto CNFs changes the LCST of the hydrogels, and at and above the LCST, the PNIPAM chains undergo conformational changes and aggregate near the CNFs, forming large voids in the solution. In contrast, the blended PNIPAM phase separates from CNF to form large aggregates at and above the LCST, without affecting the CNF network.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
M. Mathew, M. A. Rad, J. P. Mata, H. Mahmodi, I. Kabakova, C. L. Raston, Y. Tang, J. L. Tipper, J. Tavakoli
Summary: This study aimed to fabricate an alginate-HBP complex using a VFD to control the properties of alginate hydrogel. The addition of HBP increased swelling capability, diffusion coefficient, and mechanical properties, while incorporating VFD further enhanced these properties. Mixing alginate with HBP under high shear stress using a VFD created a micro-hybrid composite with improved properties.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Chemistry, Physical
Mary K. Burdette-Trofimov, Beth L. Armstrong, Luke Heroux, Mathieu Doucet, Andres E. Marquez Rossy, David T. Hoelzer, Nihal Kanbargi, Amit K. Naskar, Gabriel M. Veith
Summary: This study explores the use of polyimide binder in silicon anode systems, finding that optimizing binder concentration can lead to a 50% increase in capacity by enhancing binder-silicon-carbon interactions. The research also highlights the importance of understanding the ordering and structure of the binder for improving electrode architecture and electrochemical properties.
JOURNAL OF POWER SOURCES
(2022)
Article
Chemistry, Physical
Christophe Didier, Elliot P. Gilbert, Jitendra Mata, Vanessa K. Peterson
Summary: This study quantitatively investigates the morphology of lithium metal deposition in batteries using in situ ultra-small and small-angle neutron scattering. The research reveals the complex variations of surface area and interfacial distances influenced by current density and cell cycling history, providing valuable insights into the growth of metallic lithium features detrimental to battery performance. The findings are crucial for the development of safer and high-performance lithium metal batteries.
ADVANCED ENERGY MATERIALS
(2023)
Article
Food Science & Technology
Meltem Bayrak, Jitendra Mata, Charlotte Conn, Juliane Floury, Amy Logan
Summary: In recent years, small angle scattering techniques, especially neutron scattering, have played an important role in studying the structures of food, specifically dairy products. The gel structures formed by casein, a major dairy protein, have been extensively researched using scattering techniques to understand their behavior during digestion and improve health outcomes.
FOOD RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mary K. Burdette-Trofimov, Beth L. Armstrong, Ryan P. Murphy, Luke Heroux, Mathieu Doucet, Alexander M. Rogers, Gabriel M. Veith
Summary: The study investigates the impact of slurry aggregation, agglomeration, and conformation on electrode structure, with findings showing that different binder solution preparation methods significantly affect polymer dynamics and organization.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Applied
Meltem Bayrak, Andrew E. Whitten, Jitendra P. Mata, Charlotte E. Conn, Juliane Floury, Amy Logan
Summary: In this study, a newly developed flow setup was used to monitor the evolving structure of protein-based gels during simulated gastric digestion. The results showed that the flowing in situ system had a greater effect on the microstructural breakdown of acid-sensitive gels compared to the traditional static method. This is the first in situ digestion study observing the structural changes of large protein gel particles in real-time using ultra-small and small-angle neutron scattering.
FOOD HYDROCOLLOIDS
(2023)
Article
Materials Science, Multidisciplinary
Xuelian Wu, Bing Wang, Christine Rehm, Haiyan He, Muhammad Naeem, Si Lan, Zhenduo Wu, Xun-Li Wang
Summary: The phase evolution of CoCrFeNiMo0.3 high entropy alloy under different annealing temperatures was investigated using USANS, XRD, and SEM techniques. Secondary phase precipitation of nanoscale mu and sigma phases was observed with increasing annealing temperature, leading to a sharp drop in alloy hardness. The alloy maintained high hardness within a wide temperature range of 550-750 degrees C, making it a promising material for structural applications at intermediate temperatures.
Article
Chemistry, Physical
Badri Narayanan Narasimhan, Alexander W. Dixon, Bradley Mansel, Andrew Taberner, Jitendra Mata, Jenny Malmstrom
Summary: This study investigates hydrogels made with semi-interpenetrating networks of oligomerized polyphenol tannic acid and poly(acrylamide). The presence of micron-sized hydrogen bonded clusters in the hydrogels and the breaking of these clusters above a critical solution temperature are observed using small angle X-ray scattering and small and ultra-small angle neutron scattering. Polarized optical microscopy shows enhanced anisotropy for gels with oligomerized tannic acid, and rheological studies reveal self-healing behavior of the gels. The findings from this study contribute to the rational design of hydrogels for biomedical applications.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Mark Louis P. Vidallon, Luke W. Giles, Matthew J. Pottage, Calum S. G. Butler, Simon A. Crawford, Alexis Bishop, Rico F. Tabor, Liliana de Campo, Boon Mian Teo
Summary: The study utilized neutron scattering techniques to observe the phase transition of polydopamine-shelled perfluorocarbon emulsion droplets into microbubbles upon heating, showing that the transition temperatures are higher than the boiling points of pure liquid perfluorocarbons. Analysis and model fitting of neutron scattering data allowed monitoring of droplet size distributions at different temperatures, providing valuable insights into the transformation of these emulsion droplet systems.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Environmental Sciences
Abdulmajeed Almutairi, Yamin Wang, Furqan Le-Hussain
Summary: Managed aquifer recharge is a method for water storage and recovery, but the migration of fines during water injection can significantly impact the permeability of the formation. Previous studies have focused on fines migration in sandstone and soil samples, with limited research on fines migration in carbonate rocks. Additionally, the effects of temperature and ion type on fines migration in carbonate rocks have not been investigated. This study conducted experiments using filtered-deaired distilled water and pure salts as injection fluids. The permeability of rock samples was measured through pressure difference, and effluent samples were collected for analysis. The results showed that fines migration was influenced by mineral dissolution and cation exchange, with different impacts observed for different brine solutions and temperatures.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Multidisciplinary
Qiming Wang, Qinhong Hu, Chen Zhao, Yang Wang, Tao Zhang, Jan Ilavsky, Mengdi Sun, Linhao Zhang, Yi Shu
Summary: Laboratory-scale analysis of natural rocks provides information about their physical characteristics, such as density, porosity, and pore structure. This study investigated the effect of sample size on the petrophysical properties of different rock samples using various experimental techniques. The results suggest that the sample size influences the pore structure changes during crushing and the fluid-to-pore connectivity.
Article
Energy & Fuels
J. Jennings, D. J. Growney, H. Brice, O. O. Mykhaylyk, S. P. Armes
Summary: Asphaltenes, complex carbon-rich molecules found in crude oil, have a strong tendency to aggregate and phase separate. This causes issues in crude oil extraction, refining, and application. Understanding the morphology and mechanisms of asphaltene aggregation and designing stabilizers to prevent phase separation have been the focus of research. Imaging techniques and light scattering provide limited structural information, while small-angle scattering and X-ray diffraction offer a wealth of information about asphaltene structure.
Article
Geochemistry & Geophysics
Luca Smeraglia, Simone Fabbi, Andrea Billi, Eugenio Carminati, Gian Paolo Cavinato
Summary: This study provides meso and microstructural observations of hydrocarbon movement along faults and fault zones and reveals the cyclic flow of hydrocarbons within tectonically active faults during seismic cycles. The results indicate the occurrence of pressurized hydrocarbon pulses during coseismic slip and the formation of fault permeability during the seismic phase. The findings contribute to the understanding of the hydraulic behavior of carbonate fault damage zones and have implications for hydrocarbon exploration and production.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Chemistry, Physical
Shunsuke Hashimoto, Satoshi Yamaguchi, Masashi Harada, Kenji Nakajima, Tatsuya Kikuchi, Kazuki Ohishi
Summary: In recent research, it has been found that nanofluids composed of base liquids and dispersed solid nanoparticles show an anomalous improvement in thermal conductivity compared to the predicted value. By using various techniques, the study provides solid evidence that the vibrational behavior of liquid molecules around nanoparticles contributes significantly to the increased thermal conductivity. The vibration of liquid molecules is found to be equivalent to phonon conduction in solids, leading to a solid-like behavior in the liquid.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Chemical
Danlin Chen, Feng Yang, Dionysis S. Karousos, Linfeng Lei, Evangelos P. Favvas, Xuezhong He
Summary: The construction of H2 infrastructure is crucial for the future H2 economy. Injecting H2 into existing natural gas pipelines and recovering it using carbon membranes is a feasible alternative for H2 transportation. The developed cellulose-derived carbon membrane showed excellent separation performance and stability, with H2 permeance of up to 21.3 GPU and H2/CH4 separation factor of up to 96. Techno-economic analysis demonstrated the cost-effectiveness of H2 recovery from natural gas pipelines using a two-stage carbon membrane system.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Lydia Gkoura, Nikolaos Panopoulos, Marina Karagianni, George Romanos, Aris Chatzichristos, George Papavassiliou, Jamal Hassan, Michael Fardis
Summary: The molecular dynamics of 1-butyl-3-methyl imidazolium tricyanomethanide ionic liquid confined in SBA-15 mesoporous silica were investigated using H-1 NMR spin-lattice relaxation and diffusion measurements. Results showed that the mobility of the confined cations reduces significantly compared to the bulk in the high-temperature liquid state. The confinement also drives the ionic liquid to the glassy state at a higher temperature than the bulk, and an unusual temperature dependence is observed in the high-temperature regime.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Michalis K. Arfanis, George V. Theodorakopoulos, Christos Anagnostopoulos, Irene Georgaki, Evangelos Karanasios, George Em. Romanos, Emilia Markellou, Polycarpos Falaras
Summary: This study evaluates the effectiveness of the photocatalytic process in degrading two frequently detected pesticides in fruit industry wastewater. The results show that thiamethoxam and flonicamid can be completely degraded using the commercial photocatalyst Evonik P25 TiO2 and UV-A radiation, regardless of the pH medium. Overall, photocatalytic reduction can fully mineralize these pesticides, and the degradation kinetics follow the Langmuir-Hinshelwood (L-H) model.
Article
Chemistry, Multidisciplinary
Michael Arkas, Konstantinos Giannakopoulos, Evangelos P. Favvas, Sergios Papageorgiou, George V. Theodorakopoulos, Artemis Giannoulatou, Michail Vardavoulias, Dimitrios A. Giannakoudakis, Konstantinos S. Triantafyllidis, Efthalia Georgiou, Ioannis Pashalidis
Summary: Two different silica conformations, xerogels and nanoparticles, were tested for uranyl cation sorption at low pHs using dendritic poly (ethylene imine) as a mediator. The study investigated the effect of factors such as temperature, electrostatic forces, adsorbent composition, pollutant accessibility, and organic matrix properties to determine the optimal formulation for water purification. Through various techniques including spectroscopy, light scattering, porosimetry, TGA, and SEM, the results showed that both adsorbents exhibited extraordinary sorption capacities. Xerogels were cost-effective and could be used to create composite purification devices.
Article
Biochemistry & Molecular Biology
Athanasios N. Vasileiou, George V. Theodorakopoulos, Dionysios S. Karousos, Mirtat Bouroushian, Andreas A. Sapalidis, Evangelos P. Favvas
Summary: In this study, Pebax-1657, a commercial multiblock copolymer, was used as a base polymer to prepare mixed matrix membranes (MMMs) with improved gas-separation performance and structural properties. Carbon nanofillers, including multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs), were incorporated into the polymeric matrix. The developed membranes showed enhanced gas permeabilities and selectivity compared to the pure polymeric membrane. CO2 permeability reached 384 Barrer with a maximum CO2/CH4 separation factor of 21.9.
Article
Biochemistry & Molecular Biology
George V. Theodorakopoulos, Michalis K. Arfanis, Jose Antonio Sanchez Perez, Ana Aguera, Flor Ximena Cadena Aponte, Emilia Markellou, George Em. Romanos, Polycarpos Falaras
Summary: Nowadays, the increased agro-industrial activities have led to a potential worldwide risk for the environment as traditional wastewater treatment plants are unable to eliminate recalcitrant organic contaminants. An innovative hybrid photocatalytic nanofiltration reactor (PNFR) prototype has emerged as a promising solution by combining photocatalytic degradation with size exclusion capacity. The PNFR unit exhibits encouraging removal efficiencies against pesticides and allows for the recycling of real agro-wastewater.
Article
Nanoscience & Nanotechnology
Martha Pylarinou, Elias Sakellis, Polychronis Tsipas, George Em. Romanos, Spiros Gardelis, Athanasios Dimoulas, Vlassis Likodimos
Summary: Homojunction engineering between Mo- and Ca-doped BiVO4 nanocrystals in the skeleton of photonic band gap engineered inverse opals is introduced as a strategy to improve the efficiency of nanostructured metal oxide photocatalysts. The nanostructured homojunction Mo-BiVO4/Ca-BiVO4 photonic films outperformed their individual constituents in photocurrent generation and photocatalytic degradation rate under visible light, showing great potential for water remediation by pharmaceutical micropollutants.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Marina Karagianni, Lydia Gkoura, Amit Srivastava, Aris Chatzichristos, Nikolaos Tsolakis, George Romanos, Savvas Orfanidis, Nikolaos Panopoulos, Saeed Alhassan, Dirar Homouz, Jamal Hassan, Michael Fardis, Georgios Papavassiliou
Summary: NMR diffusion experiments and molecular dynamics simulations reveal a complex molecular ordering of ionic liquid in nanoporous silica. Molecular motion in nanosized channels can be highly complicated. The confinement of imidazolium-based RTIL [BMIM](+)[TCM](-) in MCM-41 silica nanopores leads to the formation of fluctuating charged layers near the pore walls and diffusion of RTIL molecules in coaxial tubular shells, exhibiting characteristics of single file diffusion.
COMMUNICATIONS MATERIALS
(2023)
Article
Chemistry, Physical
Eleni Anna Economou, Savvas Koltsakidis, Ioanna Dalla, Konstantinos Tsongas, George Em. Romanos, Dimitrios Tzetzis, Polycarpos Falaras, George Theodorakopoulos, Vesna Middelkoop, Themistoklis Sfetsas
Summary: The addition of biocarriers can improve biological processes in bioreactors by providing a surface for microorganism immobilization, attachment, protection, and growth. This study examined the use of aluminosilicate zeolites and inorganic binders to create 3D-printed biocarrier scaffolds. Mechanical analysis and characterization techniques were used to evaluate the properties of the biocarriers. The results showed that the combination of 13X zeolite and halloysite nanotubes exhibited the most favorable characteristics for improving biological processes.
Article
Chemistry, Multidisciplinary
Eirini Tziviloglou, Zoi S. Metaxa, George Maistros, Stavros K. Kourkoulis, Dionysios S. Karousos, Evangelos P. Favvas, Nikolaos D. Alexopoulos
Summary: This investigation examines the potential of electrochemical impedance spectroscopy (EIS) in assessing the physical and structural properties of graphene-based cementitious nanocomposites. The study demonstrates that electrical resistivity decreases and total porosity increases with the inclusion of graphene nanoplatelets (xGnP). Moreover, there exists a linear correlation between fracture toughness and electrical resistivity, highlighting the usefulness of EIS in evaluating the physical and mechanical properties of conductive nano-reinforced cementitious nanocomposites.
Article
Polymer Science
Michael Arkas, Theofanis Bompotis, Konstantinos Giannakopoulos, Evangelos P. Favvas, Marina Arvanitopoulou, Konstantinos Arvanitopoulos, Labros Arvanitopoulos, Georgia Kythreoti, Michail Vardavoulias, Dimitrios A. Giannakoudakis, Laura Castellsagues, Sara Maria Soto Gonzalez
Summary: Leathers from different animals were treated with dispersions containing hydrophilic composite silica-hyperbranched poly(ethylene imine) xerogels, and the antimicrobial activity was introduced. The gel precursor solutions were infused before gelation to titanium oxide powders for self-cleaning properties. The dispersion of these biomimetically premade xerogels integrated environmentally friendly materials with short coating times, and the performance of the treated leathers was evaluated.
Article
Environmental Sciences
Pinelopi P. Falara, Islam Ibrahim, Adamantia Zourou, Labrini Sygellou, David Emanuel Sanchez, George Em. Romanos, Lida Givalou, Maria Antoniadou, Michalis K. Arfanis, Changseok Han, Mauricio Terrones, Konstantinos V. Kordatos
Summary: Carbon quantum dots (C-QDs) prepared using hydrothermal-microwave procedures were combined successfully with nanostructured titania (TiO2). The photocatalytic activity of the C-QDs/TiO2 composite films was evaluated under UV illumination for decomposing organic-inorganic contaminants in aqueous solutions. Physicochemical characterizations were conducted to investigate the crystal structure of the C-QDs and the composites. It was found that the C-QDs/TiO2 composites exhibited great photocatalytic reduction activity towards hexavalent chromium (Cr+6) and 4-Nitrophenol (PNP), as well as photocatalytic oxidation activity towards methylene blue (MB) and Rhodamine B (RhB) dyes. The mechanism of the photocatalytic reaction was studied using trapping experiments, which revealed the powerful support of electron (e(-)) radical species for photocatalytic reduction and the dominant role of holes (h(+)) for photocatalytic oxidation reactions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Anastasios Gotzias, Elena Tocci, Andreas Sapalidis
Summary: In this study, molecular dynamics simulations coupled with umbrella sampling were used to investigate the thermodynamics of exfoliation of a single graphene layer from a graphitic substrate in different solvents. The results showed that both the nanosheet and the substrate exhibited uniform wetting behavior in all tested solvents. Consistent with experimental observations, parallel exfoliation was found to be more favorable than perpendicular exfoliation. All non-water solvents showed comparable effectiveness in graphene exfoliation.
Review
Energy & Fuels
Dionysios S. Karousos, Danial Qadir, Andreas A. Sapalidis, Faizan Ahmad, Evangelos P. Favvas
Summary: Hydrogen serves as an efficient energy carrier with the capability to store and deliver a substantial amount of energy. Regardless of the production method, raw hydrogen needs to be separated/purified from other co-produced compounds. Membrane separation processes have gained significant attention due to their numerous advantages. This review article provides a summary of the main characteristics of three major membrane categories, namely polymeric, metallic, and carbon membranes. The strengths and limitations of each membrane material category are discussed, along with the review of selected articles and their highlighted evidence.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Chemical
George V. Theodorakopoulos, Dionysios S. Karousos, Charitomeni M. Veziri, Evangelos P. Kouvelos, Andreas A. Sapalidis, Evangelos P. Favvas
Summary: This study examines the successful fabrication of polymeric hollow fiber and flat sheet membranes using the environmentally friendly solvent GBL. The developed membranes exhibit promising performance for CO2/CH4 separation.
JOURNAL OF MEMBRANE SCIENCE LETTERS
(2023)
Article
Chemistry, Applied
Lulu Wan, Gan Ye, Yuying Chang, Zhaohan Yang, Guangming Shi, Qiuli Zhang, Jin Wang
Summary: This study developed an efficient approach to upgrade the oxidative desulfurization (ODS) performance of Zr-MOFs with proton stimulation. Experimental results showed that the introduction of protons can significantly improve the ODS efficiency. This work provides a facile and efficient strategy for enhancing the ODS performance of pristine MOFs.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Qiqi Lu, Xiu-Zhi Wei, Qi Zhang, Xinghua Zhang, Lungang Chen, Jianguo Liu, Yubao Chen, Longlong Ma
Summary: The application of Pd-M bimetallic clusters in the selective hydrogenation reaction was investigated, and the Pd0.6Ni@S-1 catalyst was found to exhibit high selectivity in the conversion of phenylacetylene to styrene. The confinement effect of zeolite inhibited over-hydrogenation and improved the stability of the catalysts. Furthermore, the solvent properties also influenced the product distribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Review
Chemistry, Applied
Bo Li, Lumin Hong, Changdi Jing, Xianyang Yue, Huabo Huang, Qianqian Jiang, Jianguo Tang
Summary: MOF materials with adjustable pore structure and polymetallic sites have been explored as electrocatalysts for OER. Bimetallic materials show higher electrocatalytic activity than monometallic materials, while carbon-coated and doped MOF catalysts exhibit stable and good OER activity. The synergistic interaction between polymetallic active sites effectively improves the intrinsic activity of MOF on OER.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shichun Gu, Ruyi Wang, Junxiong Zhang, Hairong Dong, Liping Deng, Xue Wang, Yapeng He
Summary: In this study, monodispersed hollow mesoporous organosilica nanospheres with controlled core cavity and mesoporous shell were successfully synthesized. These hollow nanospheres showed a high adsorption capacity for Pb2+ in water solution and exhibited acceptable recycling and stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Lucie Havelkova, Bogdana Bashta, Michaela Vankova, Jiri Zednik, Jiri Brus, Jan Svoboda, Alice Vagenknechtova, Jan Sedlacek
Summary: An atom-economic one-step chain-growth coordination homopolymerization providing high yields of functionalized hyper-cross-linked polyacetylenes with a permanent micro/mesoporous texture and a BET area of up to 1062 m2/g is reported. The homopolymerization is highly compatible with the heteroatom groups of the monomers and allows the preparation of well-defined porous networks with a wide spectrum of univalent groups.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shirui Pang, Yuxin Liu, Zhe Zhang, Yuxin Li, Chunguang Li, Zhan Shi, Shouhua Feng
Summary: This study focuses on using a functional separator to suppress the shuttle effect of soluble lithium polysulfides in Li-S batteries. It is found that the functionalized sulfonic acid group not only accelerates the conduction of lithium ions, but also repels polysulfide anions through electrostatic interactions. The performance of the batteries is significantly improved with the use of this functionalized separator.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Pingping Li, Lei Han, Donghun Kim, Kemal Celebi
Summary: This study presents a fast synthetic strategy for the preparation of high-quality platelike MFI crystals using a thin-wall tubular reactor. The strategy is efficient, time-saving, and can be optimized, making it applicable to the preparation and optimization of other important materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Haitao Yin, Wei Wang, Yuxin Li, Hu Wen, Shuang Chen, Nanzhe Jiang
Summary: This study presents a template-free and solid-state-like crystallisation method for the synthesis of ZSM-5 zeolite, which can be scaled-up in production. Mechanical mixing of starting material components improves the dispersion of materials, leading to ZSM-5 zeolite with high crystallinity and size uniformity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Congli Li, Jiang Wang, Zhenfei Wang, Jinxiang Dong, Qi Shi
Summary: This study investigates the evolution and autoreduction behavior of Cu species in CuCl/NaY adsorbent during vacuum thermal activation. It is found that Cu species migrate from supercages to the nearby plane of the six-membered ring connecting the supercage and sod cage during vacuum activation. At 150 degrees C, vacuum autoreduction occurs, resulting in the formation of Cu+Cl- species. The results provide reference for the preparation of pi-complex adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Irena Khatrin, Iman Abdullah, Alan J. Mccue, Yuni K. Krisnandi
Summary: Hierarchical porous system with two types of mesopores provides a solution to the diffusion limitation in conventional zeolites. Cobalt oxide impregnated hierarchical ZSM-5 zeolite samples with intra- and inter-crystalline mesopores were synthesized using two different strategies. The physicochemical properties of the modified catalysts were analyzed, revealing distinct features given by the two mesoporous configurations. Catalytic activity analysis showed that Co-oxide/ZSM-5 with inter-crystalline mesopores exhibited higher activity in methane partial oxidation reaction compared to Co-oxide/ZSM-5 with intra-crystalline mesopores.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Nataliia Reinders, Martin Durovic, Pavla Honcova, Zaneta Dohnalova, Jana Luxova, Stanislav Slang, Jhonatan Rodriguez-Pereira, Petra S. Sulcova
Summary: This study presents a new method for preparing a microporous Ni2P/C catalyst with high catalytic activity. The redox reaction and carbon matrix formation during high-temperature treatment contribute to the stability and activity of the catalyst. Experimental and analytical results suggest that the microporous structure of the composite plays a crucial role in its catalytic performance. These findings are important for practical applications of efficient hydrogen production by water electrolysis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Ana Raquel Bertao, Viktoriya Ivasiv, Cristina Almeida-Aguiar, Patricia R. Correia, Antonio M. Fonseca, Manuel Banobre-Lopez, Fatima Baltazar, Isabel C. Neves
Summary: This study developed a zeolite-based delivery system (ZDS) using silver and 5-Fluorouracil as antimicrobial and antineoplastic agents. The ZDS was characterized and its antimicrobial properties were investigated, showing better antibacterial effectiveness for the ZDS containing both silver and 5-FU.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Naonobu Katada, Nobuki Ozawa, Etsushi Tsuji, Keigo Kanehara, Akiho Otsuka, Taiga Sakamoto, Kirari Umezawa, Hitoshi Matsubara, Satoshi Suganuma, Momoji Kubo
Summary: First principles calculations were used to investigate the pathway for methylation of benzene with methane catalyzed by MFI type zeolite-supported Co species. The strong adsorption of benzene on Co is found to lower the activation energy for methane dissociation and promote the formation of toluene precursor. The activation energy of methane dissociation is also affected by the Al-Al distance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Yuan Liu, An T. Ta, Kyoung Chul Park, Shenyang Hu, Natalia B. Shustova, Simon R. Phillpot
Summary: We use density functional theory to investigate the interactions of cerium, americium, and curium cations with crown ethers. Our results demonstrate that crown ethers can capture cerium, americium, and curium ions, and modifying the crown ether structure by substituting nitrogen atoms for oxygen atoms significantly increases their binding energies with radionuclides.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Zhengwu Peng, Shixing Wang, Yihui Wu, Xiang Liu, Hongliang Liu, Dekun Zhang, Likang Fu
Summary: An efficient adsorbent for recovery of germanium was prepared and characterized in this study. The adsorption behavior of Ge(IV) on the adsorbent was analyzed, and the results showed that it follows pseudo-secondary kinetic model and Langmuir isotherm model. The adsorbent exhibited good anionic anti-interference ability and can still maintain high adsorption efficiency after repeated adsorption.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
