Article
Chemistry, Physical
Chengjun Kang, Zhaoqiang Zhang, Shinpei Kusaka, Kohei Negita, Adam K. Usadi, David C. Calabro, Lisa Saunders Baugh, Yuxiang Wang, Xiaodong Zou, Zhehao Huang, Ryotaro Matsuda, Dan Zhao
Summary: Atropisomerism was observed in COF single crystals, giving rise to unconventional gas sorption behaviors through internal pore expansion. This extends atropisomerism from molecules to crystals and advances the applications of COFs in the field of soft porous crystals.
Article
Geosciences, Multidisciplinary
Rei Itsukushima
Summary: This study aims to determine the structural characteristics of pools and the factors controlling them in different stream types, finding that the size, morphology, and deposition conditions of pools vary depending on the geology.
Article
Materials Science, Coatings & Films
Alejandro Avila-Sierra, Jose A. Moreno, Kylee Goode, Taotao Zhu, Peter J. Fryer, Alan Taylor, Zhenyu J. Zhang
Summary: Using QCM-D and AFM, the effects of surface structural and chemical properties on the adsorption characteristics of beta-Lg and BSA were investigated. It was found that the typical free contact scenario used to evaluate surface energy may not accurately represent biofouling conditions. Surface structuration favored protein adsorption, especially for beta-Lg, while surface structure led to the formation of soft protein adlayers. The study demonstrated the importance of surface chemistry and structure in modulating protein-surface binding affinity and packaging density, which is crucial for developing anti-fouling coatings.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Silvana De Iuliis, Roberto Donde, Igor Altman
Summary: In this study, a time and wavelength-resolved laser-induced incandescence (LII) investigation was conducted on a titania nanoparticlegenerating flame under different laser fluences. The results suggest that the traditional description of heat exchange mechanisms between particles and the environment cannot explain the observed phenomena. The paper proposes distinguishing between electron and phonon temperatures in the nanoparticles to reconcile these observations, and discusses the fundamental phenomenon responsible for this temperature difference and its implications for pyrometry measurements in flames.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Biochemistry & Molecular Biology
Chunhuan Liu, Zhaojun Zheng, Yuanfa Liu
Summary: This study developed a novel strategy to improve the foam stability of aerated emulsions using natural waxes. Natural waxes, including beeswax, candelilla wax, carnauba wax, and rice bran wax, showed high efficiency in improving the interfacial behavior, structural properties, and foam stabilization of aerated emulsions. The presence of waxes enhanced the elastic modulus of air-liquid interfacial films and the viscosity of the continuous phase. Cryo-SEM images revealed that waxes controlled the shape of fat droplets and promoted fat coalescence. Waxes also promoted the formation of partial coalescence in the plateau borders and interface of aerated emulsions, improving foam stability. Whipping experiments showed that the addition of waxes resulted in a shorter optimum whipping time and a higher overrun of aerated emulsions. Rheology experiments supported that waxes strengthened the interface and network structure of aerated emulsions.
Article
Energy & Fuels
Minghao Yi, Yuanping Cheng, Chenghao Wang, Zhenyang Wang, Biao Hu, Xinxin He
Summary: The hydrochloric acid treatment significantly reduced the content of minerals and volatile matter in coal, which increased the porosity and pore connectivity of coal. The role of minerals in pores of different sizes varied, affecting the evolution of coal pore structure.
Article
Polymer Science
Dongqing Shao, Qun Zhang, Peng Xu, Zhouting Jiang
Summary: The effect of temperature and salt solution on the structural characteristics of protein 1BBL was studied using molecular dynamics simulations. Non-bonded energy and structural stability of the protein in salt solutions with varying concentrations and temperatures were investigated. The study demonstrated that the electrostatic potential energy and van der Waals energy of the system changed in opposite directions under the influence of the external environment, with the former exhibiting more significant changes. Structural parameters, such as root mean square deviation and radius of gyration, initially increased and then decreased with increasing salt concentration. The protein exhibited a loose and less stable structure when immersed in a monovalent solution with a salt concentration of 0.8 mol/L. Furthermore, the salt concentration corresponding to the highest structural parameters in the monovalent solution was twice that in the divalent solution. It was concluded that the protein had a compact and stable structure when immersed in salt solutions with a high concentration of 2.3 mol/L. Analysis of root mean square deviation and root mean square fluctuation also revealed that structural stability and chain flexibility were strongly influenced by temperature. These findings contribute to a better understanding of the structural characteristics of proteins in salt solutions with varying concentrations and temperatures.
Article
Engineering, Chemical
Wenhao Jia, Fen Jiao, Hailing Zhu, Le Xu, Wenqing Qin
Summary: The study found that feldspar slime had a negative impact on spodumene flotation, but this effect could be reduced by using a mixed NaOL/DDA collector, as the mixed collector exhibited better surface activity compared to NaOL alone.
MINERALS ENGINEERING
(2021)
Article
Energy & Fuels
Wei Li, Jiangtao Pang, Li Peng, Bin Fang, Wenjia Ou, Zhengtao Tao, Zhihui Liu, Fulong Ning
Summary: This study investigates the effects of two surfactants on the surface properties of a tetrahydrofuran hydrate. The surfactants are found to change the grain size, decrease grain boundary depth and surface roughness, and reduce the quasi-liquid layer thickness of the hydrate. The adhesion forces between the hydrate and probe are also reduced. These findings provide critical information on the cohesive behaviors among hydrate particles and are crucial for hydrate-related safety management.
Article
Chemistry, Multidisciplinary
Alicja Bosacka, Malgorzata Zienkiewicz-Strzalka, Anna Derylo-Marczewska, Agnieszka Chrzanowska, Magdalena Blachnio, Beata Podkoscielna
Summary: The aim of this research is to synthesize and characterize a series of DMSPS-co-DVB nanomaterials and investigate the influence of the reaction mixture composition on their properties. Advanced biphasic nanomaterials with thiol groups were successfully synthesized as potential sorbents. Various techniques were applied to study the structure, morphology, acid-base properties, and surface chemistry of the nanocomposites. Kinetic studies of aniline sorption on polymeric materials were also conducted.
FRONTIERS IN CHEMISTRY
(2023)
Article
Chemistry, Physical
Caio M. Ferreira, Geraldo J. da Silva
Summary: This study investigates the suitability of Laponite (Lap) for capturing essential oils (EO) through direct mixing of both components (Lap-EO samples). The use of solvents and heat, which could compromise the physical-chemical properties of EO, is avoided in this simple and green approach. Lavender, tea tree, and rosemary oils were used in the experiments, and the samples showed high EO absorption with Lap:EO mass ratio of 1:2. The results also revealed that incorporating EO molecules into the Lap matrix significantly improved the thermal stability of EO and absorption efficiency.
APPLIED CLAY SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Senol Kaya, Ugur Soykan, Mustafa Sunkar, Seda Karaboga, Muhsin U. Dogan, Rifki Terzioglu, Gurcan Yildirim, Cabir Terzioglu
Summary: The influences of annealing temperatures on the electrical characteristics of a p-NiO/n-TiO2 heterojunction diode were investigated, with a focus on changes in microstructure, morphology, and surface chemistry of the p-NiO/n-TiO2 films. It was found that the annealing temperature affected the stress variations in the films and the crystallization of the TiO2 layer, leading to the formation of grain structures. The study also revealed that annealing temperature played a significant role in the rectifying behavior, barrier potential, and ideality factor of the diode, with the most favorable results achieved at 400 degrees C.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Biochemistry & Molecular Biology
Jianbo Yuan, Haonan Zhang, Hui Zhao, Hao Ren, Huamin Zhai
Summary: This study compared the fiber morphology, chemical composition, lignin structure, and carbohydrate content of areca nut husks with rice straw. It found that areca nut husk fibers were shorter and wider, had higher lignin content and lower ash content. The phase separation method was shown to have advantages in lignin structure regulation and yield, making areca nut husk suitable for high-value utilization.
Article
Materials Science, Ceramics
Artem E. Lebedev, Natalia Menshutina, Illarion I. Khudeev, Roman A. Kamyshinsky
Summary: Alumina aerogels in the form of monoliths were successfully obtained via a sol-gel process, with the effects of different components on the final characteristics investigated and various characterization methods used. The aerogels exhibited high specific surface area and low density, with a structure composed of flake-like particles forming an interconnected network.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Upeksha Habarakada, Theerapoom Boonprab, Phimphaka Harding, Keith S. Murray, Wasinee Phonsri, Suzanne M. Neville, Manan Ahmed, David J. Harding
Summary: Molecular devices based on spin-crossover compounds are important in molecular electronics. In this study, stable Fe-III complexes were prepared and their structures and spin-crossover behavior were investigated. Weak interactions were found to be critical for observing spin-crossover behavior.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Polymer Science
Iryna Protsak, Volodymyr Gun'ko, Yevhenii Morozov, Ian M. Henderson, Dong Zhang, Zhang Yinjun, Volodymyr Turov
Summary: This study investigated the cleavage of siloxane bonds in polydimethylsiloxane using a mixture of dimethyl carbonate and tris(pentafluorophenyl)borane, finding that the cleavage can be achieved under mild conditions. The addition of tris(pentafluorophenyl)borane enhanced the depolymerization process, showing potential for silicone recycling and production of new OS polymers. Computational calculations revealed the mechanism behind the cleavage reaction, suggesting stable complexes formation between DMC molecules and B(C6F5)(3).
Article
Nanoscience & Nanotechnology
Alla G. Dyachenko, Olena V. Ischenko, Olena V. Goncharuk, Mykola V. Borysenko, Olexandr V. Mischanchuk, Volodymyr M. Gun'ko, Dariusz Sternik, Vladyslav V. Lisnyak
Summary: Four different catalysts were prepared for CO2 methanation, with Ni(5)Co(5)/SiO2 and Ni(2)Co(8)/SiO2 showing excellent catalytic activity and high methane yield. The methanation reaction was found to pass through the formation of O-containing intermediates bound to the active Ni-Co and nanosilica sites, as revealed by thermo-programmed desorption mass spectroscopy.
APPLIED NANOSCIENCE
(2022)
Article
Chemistry, Physical
Vladimir M. Gun'ko
Summary: The characteristics calculated using quantum chemical methods can be attributed to local electronic structures of individual atoms in complex systems. Average values may not be accurate due to variations in atomic characteristics. The study aims to utilize distribution functions of atomic charges, chemical shifts, and molecular orbital energies as simple tools for analyzing complex systems.
INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
(2021)
Article
Chemistry, Physical
Vladimir V. Turov, Vladimir M. Gun'ko, Tetyana Krupska, Mykola Borysenko, Mykola T. Kartel
Summary: The study explores the effects of hydrophobization on nanosilica properties and the possibility of preparing hydrophilic samples by adding water and mechanical treatment. It was found that the density of the samples increases at specific water content, and the interaction energy between water and nanoparticles shows a non-monotonic relationship.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Polymer Science
Volodymyr M. Gun'ko
Summary: The article discusses how to extract quantitative information from experimental data for complex materials characterization, using various methods such as X-ray scattering, thermoporometry, and spectroscopy. It is important to use appropriate physicomathematical models and computational programs to accurately describe the material properties. The most accurate characterization of complex materials is achieved by using multiple complemented methods simultaneously to enhance the understanding of material behavior.
Article
Chemistry, Physical
V. M. Gun'ko
Summary: The particulate morphology and texture of silicas, carbons, and porous polymers were analyzed using adsorption, SAXS, and microscopic methods. Different correlations between pore volume and specific surface area were observed for different material classes. The nanopores in activated carbons transformed into narrow mesopores with changes in activation time.
APPLIED SURFACE SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Iryna S. Protsak, Yevhenii M. Morozov, Dong Zhang, Volodymyr M. Gun'ko
Summary: The study investigated the molecular interactions between a silica surface and organic/inorganic polymers using solid-state NMR spectroscopy, revealing that the pretreatment temperature of silica nanoparticles affects the grafting of modifier blends onto the surface. Different surface areas and size distributions of silica nanoparticles also impact the textural characteristics of the modified surfaces.
Article
Chemistry, Physical
Volodymyr V. Turov, Tetyana V. Krupska, Nataliia V. Guzenko, Mykola V. Borysenko, Yury M. Nychiporuk, Volodymyr M. Gun'ko
Summary: This study investigates the influence of hierarchical nanoparticle/aggregate/agglomerate structure, texture, and surface characteristics of hydrophobic nanosilica AM1 stirred with a small amount of water on the behaviors of weakly and strongly associated waters. The results show significant reorganization of the interfacial water forming clusters and domains differently affected by various co-adsorbates. The findings provide insights into the quantitative analysis of weakly and strongly associated waters affected by different co-adsorbates.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Environmental Sciences
Mariia Galaburda, Alicja Bosacka, Dariusz Sternik, Viktor Bogatyrov, Olena Oranska, Volodymyr Gun'ko, Anna Derylo-Marczewska
Summary: In this study, novel hybrid carbon-mineral materials were synthesized and their adsorption efficiency in wastewater treatment was investigated. The results showed that the materials exhibited good adsorption performance and differentiated selectivity towards different organic compounds. These findings demonstrate the potential of biochars as materials for water and wastewater remediation.
Article
Chemistry, Physical
V. M. Gun'ko
Summary: Complex fumed nanooxides SiO2/Al2O3, SiO2/TiO2, and Al2O3 /SiO2/TiO2 were studied and found that the interior and surface contents of alumina in SA and AST are nonmonotonic functions of total Al2O3 content, while the titania in ST and AST is not affected. This is due to the difference in precursor reactivity of Al2Cl6 and SiCl4 vapor compared to TiCl4 and SiCl4 vapor. Additionally, titania tends to form cores while silica forms NPNP shells.
Article
Environmental Sciences
Mariia Galaburda, Alicja Bosacka, Dariusz Sternik, Olena Oranska, Mykola Borysenko, Volodymyr Gun'ko, Anna Derylo-Marczewska
Summary: Magnetosensitive biochars were prepared by mechanochemical ball-milling of lignin and blast furnace dust, followed by pyrolysis. The materials were characterized using various techniques, and the adsorption studies showed their potential in water remediation.
Article
Chemistry, Physical
Yu. V. Yavorskyi, A. B. Hrubiak, Ya. V. Zaulychnyy, M. V. Karpets, V. V. Moklyak, V. M. Gun'ko, O. I. Dudka
Summary: This study investigates the relationship between the electrochemical properties and grinding duration of mixed nanosilica and nanoalumina powders. It explores the impact of structural and morphological changes on the electrochemical characteristics of the nanocomposite powder. The study utilizes techniques such as scanning electron spectroscopy, X-ray diffraction analysis, and ultra-soft X-ray emission spectroscopy to analyze the structural and morphological characteristics.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Volodymyr M. Gun'ko, Volodymyr V. Turov, Tetyana Krupska, Mykola Borysenko
Summary: This study investigates the temperature and interfacial behaviors of concentrated alkali solutions under confined space effects. The findings illustrate that the characteristics of bound water and water/NaOH clusters strongly depend on the hydrophilicity/hydrophobicity of nanosilicas, dispersion media, and the deposition sequence of NaOH and water.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Victoria Paientko, Olena I. Oranska, Volodymyr M. Gun'ko, Ewa Skwarek
Summary: To improve the properties of rose clay composites, mechanical treatment was used to prepare nanostructured composites with natural and synthetic nanomaterials. Various characterization methods were employed to analyze the materials. The composites showed enhanced release of bioactive substances and demonstrated potential for cosmetic applications.
Article
Chemistry, Multidisciplinary
Mirtemir Kurbanov, Lyudmyla Andriyko, Jamshid Panjiev, Sardor Tulaganov, Volodymyr Gun'ko, Andrii Marynin, Stanislaw Pikus
Summary: A new pilot plant equipment has been developed that utilizes the physical effects of sublimation and desublimation for processing silicon-containing raw materials. By using this equipment, amorphous silicon dioxide and iron oxide can be separated from metallurgical waste, resulting in a collective concentrate of valuable components.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
