Article
Biochemistry & Molecular Biology
Gabriel Gama da Silva Figueiredo, Daishi Takayama, Katsunori Ishii, Mikihiro Nomura, Takamasa Onoki, Takuya Okuno, Hiromasa Tawarayama, Shinji Ishikawa
Summary: Thin pure-silica chabazite (Si-CHA) membranes were successfully synthesized using a secondary growth method on a porous silica substrate, achieving a high CO2 permeance and CO2/CH4 permeance ratio. The CO2 permeance through the Si-CHA membrane on a porous silica substrate was found to be twice as high as that through a membrane synthesized on a porous alumina substrate, despite similar zeolite layer thickness.
Article
Physics, Applied
Haihua Zheng, Zhongpo Zhou, Ti Wang, Pengbin Gui, Hao Wu, Chang Liu
Summary: The study focuses on the use of inorganic perovskite emitters in all-inorganic light-emitting diodes and finds that the Al2O3 interlayer plays a crucial role in determining electroluminescence performance by limiting electron-hole recombination within the perovskite, resulting in a shift to pure green emission peaks in the LEDs.
APPLIED PHYSICS LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Mi Zhenrui, Lu Tingting, Zhang Jia-Nan, Xu Ruren, Yan Wenfu
Summary: This review summarizes the currently discovered pure silica zeolite-type frameworks, introduces the progress achieved in the synthesis of pure silica zeolite, and prospects the areas for future exploration in the synthesis and development of pure silica zeolite.
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
(2022)
Article
Engineering, Environmental
Zhonghao Peng, Ze Liu, Yu Gao, Jiayu Liu, Dongmin Wang, Hongying Liu, Yanbo Zhang, Li Li
Summary: This paper investigates the effects of various factors on the synthesis of DDR zeolite using silica fume as raw material, and determines the optimum synthesis condition, which reduces the cost of synthesis and achieves the utilization of waste materials.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Sadao Araki, Ryosuke Yamashita, Kang Li, Hideki Yamamoto
Summary: An amorphous silica hollow fiber was prepared by the phase inversion method, and the effects of calcination temperature on its properties were investigated. A silica CHA zeolite membrane was synthesized on the silica hollow fiber support with relatively high CO2 permeance and CO2/CH4 selectivity achieved. Membranes prepared using seeding method showed improved CO2/CH4 selectivity and permeance compared to conventional CHA zeolite membranes.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Optics
Jiaxuan Zhang, Dejian Chen, Kunyuan Xu, Jie Hu, Sisi Liang, Haomiao Zhu
Summary: CsPbBr3 nanocrystals are encapsulated in closed-hole mesoporous silica KIT-6, forming CsPbBr3@KIT-6 composites with high photoluminescence quantum yield and narrow bandwidth. These composites exhibit excellent stability and can effectively protect the nanocrystals from the impact of water or light irradiation. They can be used for the fabrication of white-light-emitting diodes with good device stability.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Applied
Jingmin Lan, Peiwen Liu, Ping Fu, Xiaoling Liu, Menglin Xie, Shi Jiang, Haimeng Wen, Yu Zhou, Jun Wang
Summary: In this study, highly dispersive Pd nanoparticles were successfully encapsulated within a pure silica zeolite matrix. The champion catalyst Pd-Si-ZSM-22 exhibited high catalytic efficiency with excellent selectivity and stability, making it a promising candidate for hydrogenation reactions.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Chuying Wang, Wen Meng, Yacong Li, Guangyong Xu, Min Peng, Shuming Nie, Zhengtao Deng
Summary: In this study, a novel colloidal synthesis route was reported using lauryl methacrylate (LMA) as the reaction solvent to improve the solubility of precursors, resulting in small-sized alpha-CsPbI3 QDs with a diameter of only 4.2 nm. These QDs exhibited a tunable photoluminescence emission peak in the bright pure red region of 627 to 638 nm. This research provides a high-performance pure red fluorescent material with a robust, low-cost, and reproducible colloidal chemistry for the adoption of perovskite QDs in display backlight application.
Article
Engineering, Chemical
Jiancheng Lan, Linzhe Li, Wensen Song, Hammad Saulat, Haowen Wu, Jianhua Yang, Chengmin Yang, Yang Li, Jinming Lu, Yan Zhang
Summary: Pure-silica MFI zeolite membrane with ethanol-selectivity was successfully fabricated using TBA(+) and TEA(+) as templates and cooperating agents. This approach outperformed the use of single templates in achieving desired membrane properties.
Article
Agricultural Engineering
Jianbin Huang, Jian Zhang, Shiyao Lu, Yehao Liang, Feng-Shou Xiao
Summary: The hydrothermal treatment of pure silica Beta zeolite supported copper species (Cu/Si-Beta-HT) has been found to be highly efficient for the catalytic conversion of glycerol to 1,2-propanediol, achieving a conversion rate of 96.0% and selectivity of more than 99.9%. The high dispersion of Cu nanoparticles in the catalyst is confirmed by TEM images and N2O titration experiments. Pyridine-adsorption FTIR spectra and NH3-TPD profiles suggest the presence of copper species as Lewis acidic sites in the catalyst. The hydrogenolysis of glycerol to 1,2-propanediol involves the dehydration of glycerol to acetol and the hydrogenation of acetol to 1,2-propanediol, catalyzed by copper cations and Cu nanoparticles, respectively. In situ FT-IR spectra and kinetic studies indicate that the dehydration step is slower than the hydrogenation step and is a key process for this reaction.
BIOMASS & BIOENERGY
(2023)
Article
Engineering, Chemical
Mengya Chen, Wanying Guo, Xue Kong, Xiaoxue Tang, Senlin Yang, Danni Meng, Longfei Zhou, Jialin Ma, Xinrui Du, Yanfeng Zhang
Summary: To bring zeolite membranes to commercial application, the issues of low permeance, poor reproducibility, high manufacturing cost and scale-up need to be addressed. This study achieved facile and efficient preparation of pure silica CHA membrane by using an active silica source, ammonium hexafluorosilicate, in a homogeneous mother liquor. The replacement of conventional imhomogeneous slurry-like mother liquor with a homogeneous mother liquor greatly improved the reproducibility of membrane synthesis and favored the formation of thin membrane. The gel-less synthesis reduced material waste without sacrificing selectivity and permeance, resulting in a facile and reproducible preparation method for thin pure silica CHA membrane with high material efficiency.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Applied
Paloma Vinaches, Florian Meneau, Sibele B. C. Pergher
Summary: This manuscript discusses the nucleation and growth mechanism of pure silica zeolite HPM-1, proposing a four-step synthesis mechanism based on different populations of nanoparticles and porous surface intermediate. Through various characterization techniques, it is demonstrated that the synthesis follows a nonclassical mechanism of zeolitic nucleation and growth.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Thermodynamics
Zhenyu Liu, Zeyu Liu, Runkeng Liu
Summary: In this study, the evaporation of an ultra-thin liquid film confined below a graphene nanopore was simulated using a molecular dynamics (MD) approach. The effects of functional groups and ion concentration on the evaporation process were analyzed based on the obtained data. It was found that the modification with hydroxyl functional groups on the graphene nanoporous membrane can enhance heat transfer and improve the evaporation rate. However, for electrolytic solutions with higher ion concentration, the oxidized-pore nanoporous membrane exhibits evaporation deterioration due to the ion aggregation effect, resulting in a decrease in the equilibrium temperature of water molecules. There exists an optimal ion concentration that maximizes the evaporation rate. The rotational and translational inertias of the ions were identified as the main factors affecting the evaporation rate of electrolytic solutions under the hydroxyl group functionalized graphene nanoporous membrane.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Electrical & Electronic
Qing Wei, Qianfa Su, YiZhen Liu, Rui Chen, Xiuying Gao, Tixian Zeng, Hui Sun
Summary: Detection characteristics of elementary tellurium nanocrystalline thin film for NO2 gas detection were investigated. A compact and continuous nanocrystalline film structure was confirmed, improving the sensitivity of the sensors. The sensor showed a ppm-level NO2 detection limit and a maximum sensitivity of 7.926 x 10(5) ppm(-1).
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Nkululeko Z. N. Ndlovu, Alechine E. Ameh, Leslie F. Petrik, Tunde V. Ojumu
Summary: In this study, an alkaline leaching process was used to extract silica from coal fly ash, which was further transformed into a sodalite zeolite. The extracted silica was then treated with water and used to synthesize pure phase ZSM-5 zeolite. The innovative use of water treatment step before the hydrothermal process significantly reduced the production cost and led to a viable synthesis process. This study provides a holistic approach to using coal fly ash as a useful resource for synthesizing zeolites.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Juan I. Mirena, Denis Constales, Johan Martens, Jolien Dendooven, Gregory S. Yablonsky, Vladimir V. Galvita
Summary: The study reveals the complex dynamic behavior of CO oxidation over a Pt catalyst in heterogeneous catalysis. It shows that critical phenomena in such systems are influenced by surface interactions, nonlinear reaction mechanisms, and the transport of energy and mass. The pulse experiments conducted with a TAP reactor demonstrate the dependence of the dynamic patterns on the pulsed CO/O2 ratio and the local bed temperature, resulting in a dynamic transition between two critical values of the reaction rate for feed mixtures richer in O2 due to controlled interactions of adsorbed species on the catalyst's surface.
Article
Engineering, Chemical
Maarten Houlleberghs, Loes Verheyden, Filip Voorspoels, C. Vinod Chandran, Karel Duerinckx, Sambhu Radhakrishnan, Johan A. Martens, Eric Breynaert
Summary: Magnetohydrodynamic mixing was evaluated as an alternative method to conventional high shear mixing for preparing carbomer hydrogels. Results showed that magnetohydrodynamic mixing can adjust the viscosity of the hydrogel and achieve higher concentrations of TEA.
Article
Chemistry, Analytical
Hannah Vanderschaeghe, Maarten Houlleberghs, Loes Verheyden, Dirk Dom, C. Vinod Chandran, Sambhu Radhakrishnan, Johan A. Martens, Eric Breynaert
Summary: Porous silica is commonly used to enhance the bioavailability of poorly soluble compounds in drug delivery. Traditional methods for residual solvent quantification in drug formations are tedious and involve extraction and capillary gas chromatography. This study presents a new method using magic-angle spinning nuclear magnetic resonance spectroscopy, originally developed for water quantification in zeolites. The results show that the initial water content of the silica carrier can impact the residual solvent concentration in drug-loaded materials.
ANALYTICAL CHEMISTRY
(2023)
Article
Physics, Applied
Alexander O. Serov, Alexey N. Ryabinkin, Alexey S. Vishnevskiy, Sergej Naumov, Alexander F. Pal, Tatyana V. Rakhimova, Dmitry S. Seregin, Konstantin A. Vorotilov, Mikhail R. Baklanov
Summary: The degradation of a porous organosilicate glass low-k dielectric during ionized physical vapor deposition of tantalum coating is mainly caused by vacuum UV flux from the argon inductively coupled plasma, not by direct current magnetron sputter plasma. The damage is associated with the removal of carbon-containing groups and breaking of Si-O bonds, resulting in the formation of hydrophilic Si-OH and Si-H groups. Therefore, the degree of damage can exceed expectations.
PLASMA PROCESSES AND POLYMERS
(2023)
Review
Chemistry, Multidisciplinary
Foster Lubbe, Jan Ronge, Tom Bosserez, Johan A. Martens
Summary: Hydrogen is classified and labeled based on the resources and processes used in its production, such as electrolysis, and energy sources, such as solar radiation. Green hydrogen is primarily produced through the electrolysis of water using renewable electricity from wind, geothermal, solar, or hydroelectric power plants. Solar hydrogen generators, which integrate sunlight harvesting and water molecule splitting, are more modular and operate at a smaller scale. The term "golden hydrogen" is proposed to differentiate hydrogen produced by modular solar hydrogen generators. Decentralized modular production of golden hydrogen complements centralized and energy-intensive green hydrogen production. The distinction between green hydrogen and golden hydrogen can help promote the additionality principle in clean hydrogen policies.
CURRENT OPINION IN GREEN AND SUSTAINABLE CHEMISTRY
(2023)
Article
Chemistry, Physical
Hannelore Geerts-Claes, Sam Smet, Christoph Hengst, Frank-Walter Schuetze, Elke Verheyen, Matthias Minjauw, Christophe Detavernier, Sreeprasanth Pulinthanathu Sree, Johan Martens
Summary: This study investigates the mechanism of NOx adsorption on a Pd/FER zeolite in gas mixtures containing CO, O2, and H2O. It is found that oxidized palladium is required for achieving NOx adsorption, while clustered zerovalent palladium reduced with H2 cannot adsorb NOx in the presence of O2. The study provides evidence for a reaction mechanism involving oxygen-bridged PdII-O-PdII moieties of PdO nanoclusters, and the NO adsorption site on palladium is obtained by reducing one of the two PdII atoms to the zerovalent state, which is more readily achieved with CO compared to NO, explaining the beneficial role of CO.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Md Rasadujjaman, Jinming Zhang, Dmitry A. Spassky, Sergej Naumov, Alexey S. Vishnevskiy, Konstantin A. Vorotilov, Jiang Yan, Jing Zhang, Mikhail R. Baklanov
Summary: The UV-induced photoluminescence of organosilica films with specific chemical groups was studied to understand the nature and origin of optically active defects. It was found that the sources of luminescence were carbon-containing components and carbon residues formed during the sample preparation process. A good correlation between the photoluminescence peaks and chemical composition was observed. The intensity of photoluminescence increased with porosity and internal surface area, and additional bands appeared after annealing, indicating changes in the matrix and segregation of residues on the surface.
Article
Chemistry, Multidisciplinary
Katherine Stewart, Katia Pagano, Ellasia Tan, Matyas Daboczi, Martina Rimmele, Joel Luke, Salvador Eslava, Ji-Seon Kim
Summary: This study investigates the effect of minor modifications to side-chain density on polaron formation in organic semiconductors and demonstrates their impact on the electrical response of polymers in gas sensing. The results show that reducing side-chain density leads to a multistep polaron formation and allows for the formation of a higher density of polarons with fewer structural changes. More numerous but more localized polarons generate a stronger analyte response but lack selectivity between polar and non-polar solvents, while more delocalized polarons show clear selectivity.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hannelore Geerts-Claes, Gina Vanbutsele, Sreeprasanth Pulinthanathu Sree, Sambhu Radhakrishnan, C. Vinod Chandran, Eric Breynaert, Johan A. Martens, Sam Smet
Summary: RHO zeolites with different Si/Al ratios and particle morphologies were successfully synthesized by adding crown ether and adjusting the sodium content. The zeolites showed exceptional stability even at low Si/Al ratios, which can be attributed to the double eight-ring framework.
CRYSTAL GROWTH & DESIGN
(2023)
Review
Materials Science, Coatings & Films
Mikhail R. Baklanov, Konstantin P. Mogilnikov, Alexey S. Vishnevskiy
Summary: The review article provides an overview of important techniques for evaluating the porosity of thin films. These methods include ellipsometric porosimetry (EP), positron annihilation spectroscopy (PAS/PALS), and grazing incidence small-angle x-ray scattering (GISAXS). The article highlights the challenges and limitations of each method and demonstrates their unique insights into pore structure. The cross-evaluation of different methods enhances understanding of complex pore structures and emphasizes the importance of appropriate data modeling and interpretation.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Multidisciplinary
Junyi Cui, Matyas Daboczi, Zhenyu Cui, Mengjun Gong, Joseph Flitcroft, Jonathan Skelton, Stephen C. Parker, Salvador Eslava
Summary: This work investigates the enhancement of BiVO4 photoanodes with a series of core-shell structured bimetallic nickel-cobalt phosphides (MPs) and provides insights into the role of co-catalysts. The best performing photoanodes achieve a 3.5-fold increase in photocurrent compared to bare BiVO4. The enhancement is attributed to the synergy between the work function, catalytic activity, and capacitive ability of the MPs. Kinetic studies reveal that the enhanced charge injection at the interface is due to lower charge-transfer resistance, improved oxygen-evolution reaction kinetics, and higher surface hole concentrations. This study provides deeper insights for the rational design of photoanode/co-catalyst systems.
Article
Materials Science, Multidisciplinary
Md Rasadujjaman, Jinming Zhang, Alexey S. Vishnevskiy, Jing Zhang, Mikhail R. Baklanov
Summary: Eu-doped periodic mesoporous organosilicate (PMO) films have been successfully synthesized using sol-gel technology and spin-coating. The Eu doping alters the properties of the films and introduces luminescence emission. This study is significant for the development of novel functional organosilica materials.
Article
Chemistry, Multidisciplinary
Sambhu Radhakrishnan, Charlotte Lejaegere, Karel Duerinckx, Wei-Shang Lo, Alysson F. F. Morais, Dirk Dom, C. Vinod Chandran, Ive Hermans, Johan A. A. Martens, Eric Breynaert
Summary: During the liquid phase adsorption of C-1-C-5 primary alcohols on high silica MFI zeolites, the concentration of adsorbed molecules exceeds the traditional adsorption sites. This additional adsorption is driven by hydrogen bonding between the alcohol function and the zeolite siloxane bridges, while chemi- and physi-sorption on traditional sites also occur simultaneously.
MATERIALS HORIZONS
(2023)
Proceedings Paper
Materials Science, Characterization & Testing
Nikolaus Doppelhammer, Dries Vandenabeele, Karel Asselman, Eric Breynaert, Bernhard Jakoby, Christine E. A. Kirschhock
Summary: Studying the kinetics of crystal formation is crucial for understanding the self-assembly of complex materials. This study proposes a differential impedance measurement method to accurately track the in situ crystallization of zeolites, overcoming the limitations of classical electrode-based impedance spectroscopy.
2023 INTERNATIONAL WORKSHOP ON IMPEDANCE SPECTROSCOPY, IWIS
(2023)
Article
Chemistry, Physical
Geert Watson, Nithin B. Kummamuru, Sammy W. Verbruggen, Patrice Perreault, Maarten Houlleberghs, Johan Martens, Eric Breynaert, Pascal van der Voort
Summary: This study explores the use of hydrophobic periodic organosilica nanoparticles for hydrogen storage as clathrate hydrates. The surface decoration with promoter agents enhances the formation and growth kinetics of clathrate hydrates, resulting in an increase in hydrogen storage capacity. These findings are of significant importance for the development of hydrogen clathrates in industrial applications.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
