Article
Biochemistry & Molecular Biology
A. Dzieniszewska, J. Nowicki, G. Rzepa, J. Kyziol-Komosinska, I. Semeniuk, D. Kie Lkiewicz, J. Czupio
Summary: This study prepared novel biosorbents based on chitosan and imidazolium ionic liquid for the removal of fluoride from aqueous solutions. Experimental results showed that the introduction of ionic liquid significantly improved the adsorption performance of fluoride, and the adsorption was influenced by the experimental conditions and the method of ionic liquid synthesis.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Physical
Anna Slastanova, Richard A. Campbell, Luisa Islas, Rebecca J. L. Welbourn, John R. P. Webster, Mauro Vaccaro, Meng Chen, Eric Robles, Wuge H. Briscoe
Summary: The study found that the neutral amphiphilic PEG-g-PVAc copolymer can interact with cationic DTAB at the air-water interface in both synergistic and antagonistic ways, depending on the surfactant concentration, transitioning from cooperative to competitive adsorption behavior. The characteristics of the surfactant headgroup play a crucial role in determining the structure and foamability of the polymer-surfactant complexes at the air-water interface.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Tongyao Zhao, Xiaoyan Li, Yumei Gong, Yanzhu Guo, Fengyu Quan, Qiang Shi
Summary: The study focused on the binary blending of sodium alginate and quaternary ammonium chitosan to fabricate composite fibers. The results showed changes in solution state and electrical potential at different mass ratios, leading to the production of fibers with excellent properties.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Multidisciplinary Sciences
Sang Soo Lee, Ayumi Koishi, Ian C. Bourg, Paul Fenter
Summary: Classical electrical double layer (EDL) models are crucial for representing atomistic structure and reactivity at charged interfaces, but in highly concentrated salt solutions, nonclassical charge overscreening occurs due to ion cooperativity, leading to the development of ionic compounds at significantly lower ion concentrations than the bulk solubility limit.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Physical
Fumiya Nemoto, Shun-ya Nakamura, Hiroshi Abe
Summary: The research showed that the surface tension of mixtures steeply decreased upon mixing iodides, polyiodides localized around the liquid-vapor interface independently of the alkyl chain number, and longer alkyl chains effectively hindered the surface.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Biochemistry & Molecular Biology
Hezhong Wang, Maren Roman
Summary: This study aimed to investigate the effects of chitosan molecular weight and degree of deacetylation on the formation of chitosan-cellulose nanocrystal polyelectrolyte-macroion complexes. The results showed that chitosan molecular weight had no significant effect on complex formation, but had a minor impact on particle shape and size. Lower sulfate group density and larger hydrodynamic diameter of CNCs, as well as higher degree of deacetylation of chitosan, resulted in higher turbidity levels, indicating the need for more CNCs for charge compensation.
Article
Polymer Science
Jorge Lozano-Montante, Raquel Garza-Hernandez, Mario Sanchez, Edgar Moran-Palacio, Guillermo Nino-Medina, Mario Almada, Luis Hernandez-Garcia
Summary: This study successfully achieved the adsorption of Pb(II) ions in water by cellulose derivatives, and identified that cellulose composite materials cross-linked with chitosan modified with 2-methylpyridine and succinic anhydride have higher adsorption capacities. Kinetic data showed a pseudo-second-order behavior in the adsorption process.
Article
Nanoscience & Nanotechnology
Rishabha Malviya, Shakshi Raj, Shivkanya Fuloria, Vetriselvan Subramaniyan, Kathiresan Sathasivam, Usha Kumari, Dhanalekshmi Unnikrishnan Meenakshi, Omji Porwal, Darnal Hari Kumar, Amit Singh, Srikumar Chakravarthi, Neeraj Kumar Fuloria
Summary: The study successfully fabricated chitosan-TGP polyelectrolyte complex stabilized cubic nanoparticles of simvastatin, showing high entrapment efficiency and small size. These nanoparticles exhibited better control on human breast cancer cell lines and the unusual anticancer effect of simvastatin nanoparticles is supported by various research studies.
INTERNATIONAL JOURNAL OF NANOMEDICINE
(2021)
Article
Biochemistry & Molecular Biology
Perumal Karthikeyan, Sankaran Meenakshi
Summary: A novel and environmentally-friendly chitosan encapsulated magnetic kaolin beads were fabricated and applied for the adsorption of phosphate and nitrate ions from water in this study. The synthesized beads showed promising potential as selective and effective adsorbents for the removal of phosphate and nitrate ions from aqueous solutions.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Physics, Applied
Mingzhen Feng, Nolan J. Ahlm, Alexander M. Kane, I-Ting Chiu, Dayne Y. Sasaki, Padraic Shafer, Alpha T. N'Diaye, Apurva Mehta, Yayoi Takamura
Summary: The magnetic properties and interfacial phenomena of epitaxial perovskite oxide films are highly sensitive to parameters such as film thickness and strain state. In this study, it was found that magnetically active Co2+ ions appeared in the bilayer films under certain conditions, depending on the thickness of the LSCO layer and the substrate material. These findings contribute to the understanding of the interfacial exchange spring behavior and have implications for applications in spintronics and magnetic memory devices.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Polymer Science
Dovile Liudvinaviciute, Ramune Rutkaite, Joana Bendoraitiene, Rima Klimaviciute, Greta Zambzickaite
Summary: The adsorption behavior of CA on CH powder was studied, revealing that with increasing adsorption temperature, the rate of adsorption increased while the amount of adsorbed CA decreased. The Langmuir adsorption model predicted that CA mainly adsorbed on the ionized amino groups of CH.
Article
Chemistry, Physical
Stephanie L. Moffitt, Chuntian Cao, Maikel F. A. M. Van Hest, Laura T. Schelhas, Hans-Georg Steinrueck, Michael F. Toney
Summary: In this study, the existence of vertically heterogeneous thermally induced structural relaxation in amorphous In-Zn-O (a-IZO) thin films was observed using in situ X-ray reflectivity, which has not been previously observed. Thermal annealing was found to influence the electrical performance of the films. These findings are important for the development of a-IZO-based devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Polymer Science
Kam Sheng Lau, Nur Alia Sahira Azmi, Siew Xian Chin, Sarani Zakaria, Chin Hua Chia
Summary: Textile industrialization leads to water pollution from the discharge of industrial effluents. Adsorption is one method to remove pollutants from wastewater, but has limitations in terms of reusability and ionic selective adsorption. In this study, PSS-incorporated chitosan beads were synthesized and showed good adsorption capacity for methylene blue dye. The beads also demonstrated good regeneration with sodium hydroxide, allowing for multiple reuse cycles for adsorption.
Article
Biochemistry & Molecular Biology
Nadia Bouaziz, Oumayma Kouira, Fatma Aouaini, Lamies Bukhari, Salah Knani, Sami Znaidia, Abdelmottaleb Ben Lamine
Summary: The widespread use of antibiotics globally has resulted in serious concerns about their environmental and health impacts. Traditional methods of wastewater treatment have been ineffective in completely removing antibiotic residuals. Therefore, this study investigated the adsorption of doripenem, ampicillin, and amoxicillin on a bentonite-chitosan composite. The results showed that all three antibiotics adsorbed onto the composite material in a monolayer formation, and the adsorption capacity increased with temperature. The composite material was found to be a promising adsorbent for removing antibiotics from water and could be used in industrial wastewater treatment.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Physical
Linda Hevira, Joshua O. Ighalo, Dewi Sondari
Summary: This review discusses the potential and advantages of using polysaccharides, specifically chitosan and its derivatives, as efficient adsorbents for removing dyes from industrial wastewater.
JOURNAL OF MOLECULAR LIQUIDS
(2024)
Article
Materials Science, Multidisciplinary
G. Calabrese, D. van Treeck, V. M. Kaganer, O. Konovalov, P. Corfdir, C. Sinito, L. Geelhaar, O. Brandt, S. Fernandez-Garrido
Article
Chemistry, Multidisciplinary
Vladimir M. Kaganer, Oleg Konovalov, Sergio Fernandez-Garrido
Summary: Small-angle X-ray scattering from GaN nanowires grown on Si(111) was measured and modeled using Monte Carlo simulation, indicating that scattering intensity at large wavevectors depends on the orientation of side facets and is reduced by surface roughness.
ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
(2021)
Article
Engineering, Chemical
D. Petukhov, A. S. Kan, A. P. Chumakov, O. Konovalov, R. G. Valeev, A. A. Eliseev
Summary: The specific properties of O- and OH-terminated Ti3C2Tx nanosheets contribute to the permeance and sorption type selectivity of MXene membranes. These membranes demonstrate high separation factors and permeances for ammonia and water vapors, with strong sorption capacities and labyrinthine transport. The diffusion coefficient of strongly absorbed gases increases with pressure, and the interlayer distance expands, reducing activation barriers for hopping diffusion. Demonstrated characteristics make Ti3C2Tx nanosheets a promising candidate for developing ammonia selective membranes.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Polymer Science
Roberta Ruffino, Luca Fichera, Andrea Valenti, Maciej Jankowski, Oleg Konovalov, Grazia M. L. Messina, Antonino Licciardello, Nunzio Tuccitto, Giovanni Li-Destri, Giovanni Marletta
Summary: The study investigated the effect of substrates with uniform nanocurvature on the structure of deposited thin films of high molecular weight regio-regular poly(3-hexylthiophene) (P3HT). It was found that substrate curvature influences both the lamellar persistence length and the 3D orientation, leading to changes in dark conductivity measurements. The results suggest a strong correlation between the dark conductivity increase and curvature-induced lamellar features in regio-regular P3HT thin films.
Article
Chemistry, Multidisciplinary
Prince Ravat, Hikaru Uchida, Ryosuke Sekine, Ko Kamei, Akihisa Yamamoto, Oleg Konovalov, Motomu Tanaka, Teppei Yamada, Koji Harano, Eiichi Nakamura
Summary: This article reports the de novo synthesis of a 3-nm-thick nanofilm intercalating a hydrogen-bonded network between two layers of fullerene molecules, leading to high proton conductivity. The film can be uniformly formed at an air/water interface and transferred to various substrates, showing reversible bending under electron beam irradiation.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Oscar Telschow, Miguel Albaladejo-Siguan, Lena Merten, Alexander D. Taylor, Katelyn P. Goetz, Tim Schramm, Oleg Konovalov, Maciej Jankowski, Alexander Hinderhofer, Fabian Paulus, Frank Schreiber, Yana Vaynzof
Summary: Applying antisolvent via carrier-gas free spraying helps to better preserve the stoichiometry of lead halide perovskite layers. The photovoltaic performance of triple cation photovoltaic devices fabricated in an inverted architecture is enhanced using sprayed antisolvent, resulting in power conversion efficiencies as high as 21% and improved stability compared to devices fabricated by pipetting the antisolvent.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Roman Volkov, Nikolai Borgardt, Oleg Konovalov, Sergio Fernandez-Garrido, Oliver Brandt, Vladimir M. Kaganer
Summary: The study of GaN nanowires by transmission electron microscopy and X-ray scattering reveals that the cross-sectional shape of the nanowires evolves differently along the length, with {1100} side facets at the top and roundish shapes at the bottom. This is attributed to the different growth environments at the top and bottom of the nanowires, where axial growth and annealing processes occur, respectively. Grazing incidence small-angle X-ray scattering independently confirms these trends in the shape evolution of the sidewall facets.
NANOSCALE ADVANCES
(2022)
Article
Instruments & Instrumentation
Oleg Konovalov, Valentina Belova, Francesco La Porta, Mehdi Saedi, Irene M. N. Groot, Gilles Renaud, Irina Snigireva, Anatoly Snigirev, Maria Voevodina, Chen Shen, Andrea Sartori, Bridget M. Murphy, Maciej Jankowski
Summary: This paper presents a method for X-ray reflectivity measurement on highly curved liquid surfaces. With the use of a synchrotron diffractometer equipped with a double crystal beam deflector, the curved surfaces of liquid metals can be measured, providing electron-density profiles with atomic resolution accuracy. The proposed method is successfully applied to study the bare surface of molten copper and molten copper covered by a graphene layer.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Biochemistry & Molecular Biology
Bob-Dan Lechner, Paul Smith, Beth McGill, Skye Marshall, Jemma L. Trick, Andrei P. Chumakov, Charles Peter Winlove, Oleg Konovalov, Christian D. Lorenz, Peter G. Petrov
Summary: This study provides evidence that oxidation of cholesterol has significant effects on the mechanical properties, molecular and mesoscopic organisation, and lipid-sterol interactions in lipid membranes.
Article
Chemistry, Multidisciplinary
Hao Gao, Valentina Belova, Francesco La Porta, Juan Santiago Cingolani, Mie Andersen, Mehdi Saedi, Oleg Konovalov, Maciej Jankowski, Hendrik H. Heenen, Irene M. N. Groot, Gilles Renaud, Karsten Reuter
Summary: This research employs innovative in situ and in silico techniques to achieve an atomic-level characterization of graphene adsorption height above liquid copper, with quantitative agreement within 0.1 angstrom between experiment and theory.
Article
Instruments & Instrumentation
Maciej Jankowski, Valentina Belova, Yuriy Chushkin, Federico Zontone, Matteo Levantino, Theyencheri Narayanan, Oleg Konovalov, Annalisa Pastore
Summary: The Complex System and Biomedical Sciences (CBS) group at the European Synchrotron Radiation Facility (ESRF) in Grenoble specializes in studying various materials and systems, including soft and hard condensed matter, nanomaterials, and biological materials. They use scattering techniques such as X-ray diffraction and reflectivity to explore the structure and dynamics of different systems. With the recent upgrade of the ESRF storage ring, the facility has become the world's first high-energy synchrotron of the 4th generation, offering new experimental opportunities for nanoscale research. This contribution discusses the impact of the upgrade on selected beamlines in the CBS group and presents recent scientific activities after the facility reopening.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Chemistry, Multidisciplinary
Valentina Belova, Maciej Jankowski, Mehdi Saedi, Irene M. N. Groot, Gilles Renaud, Oleg V. Konovalov
Summary: This study demonstrates the possibility of using X-ray reflectivity to visualize the surface with a heterogeneous electron density due to a partial coverage by another nanometrically thin material with μm spatial resolution. The sample needs to be convexly bent to reflect the collimated incident beam onto a magnified image recorded by a position-sensitive detector. By utilizing small, intense, and parallel beams, spatially resolved X-ray reflectivity can be recorded with a frame rate of 0.1-1 kHz. The application of this method for in situ characterization of single-layer graphene domains during their chemical vapor deposition on a naturally curved surface of a liquid copper drop is also demonstrated.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Vladimir M. Kaganer, Oleg Konovalov, Gabriele Calabrese, David van Treeck, Albert Kwasniewski, Carsten Richter, Sergio Fernandez-Garrido, Oliver Brandt
Summary: GaN nanowires grown on Ti films sputtered on Al2O3 were studied using X-ray diffraction and grazing-incidence small-angle X-ray scattering. Different crystallites, including Ti, TiN, Ti3O, Ti3Al, and Ga2O3, were observed in the Ti film. The GaN nanowires exhibited a high degree of epitaxial orientation with the substrate due to the topotaxial crystallites in the Ti film. The size distributions and relative fractions of different side facets of the nanowires were determined using the Monte Carlo method and GISAXS.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2023)
Article
Instruments & Instrumentation
Linus Pithan, Vladimir Starostin, David Marecek, Lukas Petersdorf, Constantin Voelter, Valentin Munteanu, Maciej Jankowski, Oleg Konovalov, Alexander Gerlach, Alexander Hinderhofer, Bridget Murphy, Stefan Kowarik, Frank Schreiber
Summary: Recently, there has been a growing interest in applying machine-learning techniques to automated analysis of X-ray scattering experiments. This study describes the incorporation of a combined one-dimensional convolutional neural network and multilayer perceptron for extracting physical thin-film parameters and taking prior knowledge into account. Experimental results demonstrate the accuracy and stability of this method.
JOURNAL OF SYNCHROTRON RADIATION
(2023)
Article
Polymer Science
Roberta Ruffino, Maciej Jankowski, Oleg Konovalov, Francesco Punzo, Nunzio Tuccitto, Giovanni Li-Destri
Summary: We investigated the effect of nanoscale curvature on the structure of thermally equilibrated P3HT ultrathin films using GIXRD and AFM. The results demonstrate that nanoscale curvature reduces the polymer crystalline fraction and the crystal length, and the crystal anisotropy shows a marked dependence on the substrate curvature.
