Article
Chemistry, Applied
Madai Lopez-Silva, Edith Agama-Acevedo, Luis A. Bello-Perez, Jose Alvarez-Ramirez
Summary: The study found that the gelatinization of corn starch reduces its water absorption capacity, increases adsorption hysteresis, and decreases monolayer moisture content. On the other hand, OSA treatment helps to reduce water absorption capacity and hysteresis, with variations in the impact on water content depending on the gelatinization degree.
CARBOHYDRATE POLYMERS
(2021)
Article
Polymer Science
Karolina Stanicka, Renata Dobrucka, Magdalena Wozniak, Anna Sip, Jerzy Majka, Wojciech Kozak, Izabela Ratajczak
Summary: The research found that films made of high molecular weight chitosan and 5.0% propolis extract exhibited the best antimicrobial and barrier properties, with the concentration of propolis extract affecting the equilibrium moisture content of the chitosan films. These results indicate the potential application of chitosan films with propolis extract in food packaging.
Article
Polymer Science
Natalia Volkova, Dmitriy Berillo
Summary: Water sorption properties of macroporous cryogels of gelatine and dextran dialdehyde were investigated using two methods at 293 K. The GAB model showed good correlation with experimental data for the whole range of water activities.
Article
Engineering, Chemical
Eleonora Iaccheri, Valentina Siracusa, Luigi Ragni, Ana Cristina De Aguiar Saldanha Pinheiro, Santina Romani, Pietro Rocculi, Marco Dalla Rosa, Paulo Jose do Amaral Sobral
Summary: This study investigated the water and macromolecular physical state of cassava starch, chitosan, and their blend films through DSC and dielectric properties analysis. The results showed that the glass transition temperature of the films decreased with increasing moisture content, and the dielectric constant changed depending on the moisture content. When the moisture content was below a certain value, the dielectric constant remained constant.
JOURNAL OF FOOD ENGINEERING
(2023)
Article
Thermodynamics
Masoud Saberi, Parham Rouhi
Summary: The BET model, in its original or refined form (GAB), is commonly used to study the multilayer sorption of pure gases and vapors on various solids. This study theoretically extended the BET model for predicting gas mixtures sorption on solids, and derived the extended GAB model. The extended model accurately predicted the adsorption behavior of gas mixtures on different solids, making it a simple and useful tool for understanding physical sorption processes.
FLUID PHASE EQUILIBRIA
(2021)
Article
Chemistry, Analytical
Emir Nazdrajic, Khaled Murtada, Janusz Pawliszyn
Summary: Selecting the optimal binder and sorbent affinity can determine whether a composite behaves as an efficient extraction coating, permeable membrane, or impermeable barrier. For strong sorbents, extraction rate is primarily controlled by diffusion, with low analyte diffusion caused by retarding forces generated by partitioning into the sorbent.
ANALYTICAL CHEMISTRY
(2021)
Article
Energy & Fuels
Lokesh Kumar, Shefali Tripathi, Kirtiraj K. K. Gaikwad
Summary: A cactus mucilage-gelatin bio-composite film was made using a solution casting method. The effects of citric acid as a crosslinking agent at different concentrations on the film's moisture sorption characteristics and mechanical properties were studied. Results showed that incorporating citric acid reduced the film's moisture content, swelling ratio, water vapor permeability, and moisture sorption tendency. The film with 0.5% citric acid exhibited the best crystallinity and highest tensile strength, making it suitable for food packaging applications.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Engineering, Chemical
Laura L. Trinkies, Andrea Duell, Jinju Zhang, Sebastian Urban, Benedikt J. Deschner, Manfred Kraut, Bradley P. Ladewig, Andreas Weltin, Jochen Kieninger, Roland Dittmeyer
Summary: Microstructured membrane reactors provide a promising approach to address productivity and safety challenges in direct hydrogen peroxide synthesis. Various mass transport processes occur in this complex system, with experimental investigation into saturation and desaturation behaviors of the liquid reaction medium with gaseous reactants. The study also looks at the permeances of the PDMS membrane to hydrogen and oxygen at different pressures, using mathematical modeling to simulate the results and highlighting the need for constant gas channel flushing for safety reasons.
CHEMICAL ENGINEERING SCIENCE
(2022)
Review
Food Science & Technology
Hector A. Iglesias, Rosa Baeza, Jorge Chirife
Summary: This article reviews some aspects of GAB monolayer values in foods and re-analyzes literature data to find a good linear correlation between the number of polar groups and the GAB monolayer. The survey results show that for most food products, an increase in temperature leads to a decrease in the moisture content corresponding to the monolayer, but there are also cases where the monolayer remains constant or increases with temperature. Furthermore, a close relationship between the minimum integral entropy and the GAB monolayer is discovered.
FOOD AND BIOPROCESS TECHNOLOGY
(2022)
Article
Engineering, Geological
Chunguang Wang, Shuqing Liu, Xingkai Shi, Guanglei Cui, Hongxu Wang, Xing Jin, Kunkun Fan, Songtao Hu
Summary: The self-weight of solid waste and machine-rolled compaction can result in contaminant migration in landfills. The consolidation process has a significant impact on the transport of contaminants and should be given more attention.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Kristine Irtiseva, Marika Mosina, Anastasija Tumilovica, Vjaceslavs Lapkovskis, Viktors Mironovs, Jurijs Ozolins, Valentina Stepanova, Andrei Shishkin
Summary: In this study, three-component bio-based composite granular adsorbents were developed and tested for their effectiveness in collecting oil spills and oil products. The pellets showed a pronounced ability to absorb oil products, especially diesel fuel. The addition of devulcanised crumb rubber significantly increased the diesel absorption capacity, while the presence of cenospheres in the biocomposite reduced its surface hydrophobicity. The designed absorbent demonstrated high sorption capacity for motor oil and diesel.
Article
Engineering, Chemical
Giuseppe Genduso, Khalid Hazazi, Zain Ali, Bader S. Ghanem, Abdulrahman Alhazmi, Ingo Pinnau
Summary: The transport properties of a carbon molecular sieve (CMS) film in CO2-CH4 pure and mixed gases were studied. It was found that the CMS film had a lower CO2/CH4 mixed-gas solubility selectivity compared to glassy polymer films, and this selectivity increased with pressure. The presence of CO2 enhanced the diffusion coefficient of methane, indicating that CO2 diluted the sieving domains of the CMS matrix. As a result, the CMS film lost some of its size-sieving properties under mixed-gas conditions.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Polymer Science
Xucong Chen, Xue Li, Huijuan Zhang, Hong Li, Guiyou Wang, Yan Cui
Summary: In this study, the relationship between the diisocyanate structure and the protective properties of polyurethanes (PUs) was investigated. It was found that the diisocyanate structure had a significant influence on the adsorption and permeation behaviors of the PUs. The alicyclic PU showed the lowest adsorption and retention capacity, making it a potential candidate for protective topcoat PU material.
Article
Engineering, Chemical
M. Inoue, E. Ismail, S. Samitsu, H. Kanoh, I. Ichinose
Summary: A series of soft PDMS rubbers was obtained by diluting reaction mixtures of a PDMS macromer and a crosslinker with an organic solvent. The softest rubber could swell up to 600 wt% when immersed in pure hexane at room temperature. The loosely crosslinked PDMS rubber had a significantly higher sorption amount and a lower sorption heat compared to conventional PDMS rubber, making it an indispensable sorbent for the recovery of flammable gases in the chemical and oil and gas industries.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Yijie Wang, Liming Hu
Summary: Mathematical characterization of soil water isotherm (SWI) is essential for modeling soil processes and estimating soil properties. This study evaluates the BET and GAB models widely used in SWIs and determines if they provide meaningful monolayer contents. The GAB model outperforms the BET model in fitting the SWIs. Analyses of the monolayer thickness, area, and orientations of the adsorbed water molecules validate the reliability of the monolayer contents. Molecular simulations reveal the different effects of surface hydroxyls and cations in the adsorption process. This work provides crucial information for the rational application of the BET and GAB models to SWIs.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Chemical
Miroslav Kludsky, Marcela Dendisova, Zdenek Hrdlicka, Adela Jenistova, Stepan Hovorka, Ondrej Vopicka
Summary: Nafion, a solid perfluorinated polymeric sulfonic acid, can be extensively modified by reacting with bases, leading to changes in spectral characteristics, thermal stability, and selectivity during pervaporation. Strong bases result in significant alterations in Nafion's properties, while modifications with amino acid derivatives show minor effects. The permeability and selectivity of Nafion in pervaporating methanol mixtures are greatly influenced by modification with amines bearing hydroxyl and sulfo groups, with taurine modification showing enhanced selectivity compared to pure Nafion.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Engineering, Chemical
Martina Klepic, Johannes C. Jansen, Alessio Fuoco, Elisa Esposito, Pavel Izak, Zuzana Petrusova, Ivo F. J. Vankelecom, Alena Randova, Vlastimil Fila, Marek Lanc, Karel Friess
Summary: Membrane separation technology is rapidly developing as a replacement for traditional gas separation processes, with the study finding that blending poly (vinyl alcohol) (PVA) membrane with an ionic liquid significantly increases permeability and changes behavior from diffusion-selective to sorption-selective. Temperature increase further enhances gas permeability but reduces selectivity for most gas pairs, except for the H-2/CO2 gas pair.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Chhabilal Regmi, Saeed Ashtiani, Zdenek Sofer, Zdenek Hrdlicka, Filip Prusa, Ondrej Vopicka, Karel Friess
Summary: Mixed-matrix CTA-CeO2 membranes were fabricated using a solution-casting method, with CeO2 nanoparticles significantly increasing CO2 permeability. The 0.64 wt.% concentration showed the highest gas permeability and strong CO2 sorption affinity. However, aggregation of CeO2 nanoparticles at 0.9 wt.% concentration resulted in decreased gas permeability.
Article
Engineering, Chemical
Petr Stanovsky, Monika Benkocka, Zdenka Kolska, Miroslav Simcik, Petr Slepicka, Vaclav Svorcik, Karel Friess, Marek C. Ruzicka, Pavel Izak
Summary: Membrane separations for biogas upgrading can be improved by activation and grafting methods, with UV activation leading to significantly increased gas permeability. RO membranes grafted with cysteamine after UV activation showed a 100% increase in permeability, outperforming TFC RO membranes activated by diode discharge plasma.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Chhabilal Regmi, Saeed Ashtiani, Filip Prusa, Karel Friess
Summary: A new kind of mixed matrix membranes (MMMs) composed of titanium dioxide nanotube amalgamated graphene oxide matrix blended with cellulose triacetate polymer was developed for selective biogas upgrading. The study investigated the effect of hybrid fillers on the physico-chemical, thermal, and mechanical properties of the membranes using various spectroscopic techniques. The results showed notable improvements in these properties for the MMMs compared to the pristine membrane, along with increased CO2 adsorption affinity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Thermodynamics
Jan Praus, Pavel Pokorny, Petr Cihal, Ondrej Vopicka
Summary: The diffusivity and solubility of various compounds in ionic liquids were studied. The results showed that different ionic liquids had different effects on the solubility of different compounds. The diffusion was anomalously fast, and there was a relationship between the structure and properties.
FLUID PHASE EQUILIBRIA
(2022)
Article
Chemistry, Physical
Saeed Ashtiani, Chhabilal Regmi, Jalal Azadmanjiri, Nguyen Vu Hong, Vlatsimil Fila, Filip Prusa, Zdenek Sofer, Karel Friess
Summary: A single-crystal magnetic-responsive core-shell MOF was synthesized by grafting Fe3O4 nanoparticles onto UiO-66-NH2 and embedding them into gas separation mixed matrix membranes. The stimuli-responsive behavior of the MMOF was confirmed, and its dispersion in a well-defined arrays structure in the PMMA matrix was observed. The presence of a magnetic field prevented MMOF aggregation and sedimentation, resulting in improved gas permeability and selectivity compared to non-controlled samples.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Chemical
Seung-Hak Choi, Alena Randova, Ondrej Vopicka, Marek Lanc, Alessio Fuoco, Johannes Carolus Jansen, Karel Friess
Summary: The gas and organic vapor permeation of integrally skinned asymmetric poly(vinylidene fluoride) (PVDF) hollow fiber membranes were studied. The behavior of methanol, dichloromethane, and acetone differed due to their interaction with the polymer phase. The study provides insights into the potential applications of asymmetric PVDF membranes in gas/vapor separation and pervaporation.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Biotechnology & Applied Microbiology
Ondrej Vopicka, Marek Lanc, Karel Friess
Summary: Vapour sorption isotherms for PIM-1 and PIM-EA-TB show specific sigmoidal shapes and are strongly influenced by the volatility of the sorptive. The GAB model is used to parameterize the sorption isotherms, providing physically interpretable parameter values.
CURRENT OPINION IN CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Addison Jung, David Reha, Babak Minofar, Petr Stanovsky, Mariia Pasichnyk, Michal Pribyl, Jason E. Bara, Karel Friess, Vlastimil Fila, Pavel Izak
Summary: The embedding of ionic liquids (ILs) into the polymer membrane matrix affects the morphology and properties of the material. Polymer-IL systems generally exhibit improved separation properties due to the unique nature of ILs. In this study, the CO2/CH4 separation properties of poly (vinylidene fluoride-co-hexafluoropropylene)) (poly (VDF-HFP)) with different amounts of 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide ([EMIM] [TFSI]) were simulated using classical molecular dynamics (MD).
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Biochemistry & Molecular Biology
Chhabilal Regmi, Jalal Azadmanjiri, Vipin Mishra, Zdenek Sofer, Saeed Ashtiani, Karel Friess
Summary: The use of two-dimensional MXene nanofillers improves the compatibility and CO2/CH4 separation performance of CTA-based MMMs, suggesting potential application in bio/natural gas separation.
Review
Chemistry, Multidisciplinary
Fabrizio Guzzetta, Cameron W. Jellett, Jalal Azadmanjiri, Pradip Kumar Roy, Saeed Ashtiani, Karel Friess, Zdenek Sofer
Summary: The attention in recent decades has been focused on the optoelectronic properties of indium and gallium chalcogenides, leading to advancements in fundamental and applied science. Group III-VI compounds have laminated structures that can be exfoliated to monolayers. Besides indium and gallium chalcogenides, there are other uncommon compounds in the family of group III-VI compounds, which have various crystal lattices, including layered structures. Aluminum chalcogenides show potential as anodes in batteries and semiconductors. Studies on thallium-based compounds are still exploring their semiconducting and thermoelectric properties. This review aims to summarize the significant features of these unusual materials and propose new studies to revive their potential in future technology.
Article
Chemistry, Multidisciplinary
Saeed Ashtiani, Jalal Azadmanjiri, Nguyen Vu Hong, Jana Florekova, Chhbilal Regmi, Zdenek Sofer, Mehdi Khoshnamvand, Karel Friess
Summary: Gas separation matrix membranes with magnetic nanoparticles deposited using orthogonal magnetic field exhibit improved gas transport pathways and enhanced gas separation performance.
ADVANCED MATERIALS INTERFACES
(2022)
Review
Engineering, Chemical
Mariia Pasichnyk, Petr Stanovsky, Petr Polezhaev, Boleslav Zach, Michal Syo, Marek Bobak, Johannes C. Jansen, Michal Pribyl, Jason E. Bara, Karel Friess, Jaromir Havlica, Douglas L. Gin, Richard D. Noble, Pavel Izak
Summary: The major gaseous pollutants emitted during the combustion of fossil fuels, energy-intensive production of materials, and waste processing are CO2, SO2, and NOx. The industry and research community are working together to intensify their capture and reduce their emissions in order to meet stricter emission limits. Membrane separation technology, which is energy-efficient and can be combined with other technologies, is a significant application for environmental protection. Different types of membranes with specific functions and unique systems are discussed as promising technologies for flue gas purification.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Polymer Science
Mustafa Kalay, Abidin Esidir, Mahmut Ruzi, N. Burak Kiremitler, Mustafa Serdar Onses
Summary: This study proposes stable and addressable polymer PUFs, utilizing a cross-linkable polymer system, which demonstrates high stochastic characteristics and low-cost production. The performance of the polymer features is evaluated through various analyses, and direct image authentication is achieved using feature matching algorithms.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Jingyu Jin, Guoqiang Lu, Jun Nie, Xiaoqun Zhu
Summary: Photopolymerization technology is limited in the fields of food packaging and biomedicine due to the high migration of small molecules from photoinitiators. In this study, a polymerizable 2-vinyl thioxanthone (ETX) was synthesized to improve the migration stability of photoinitiators. Macromolecular photoinitiators (PPI1, PPI2) were also prepared to further reduce migration. The results showed that the ETX/TEOA system had higher initiation performance and PPI2 displayed favorable initiation ability. Additionally, the migration of ETX, PPI1, and PPI2 in photocured film was significantly reduced. These low-migration photoinitiators have potential applications in the fields of food packaging and biological materials.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Weijie Li, Jun Nie, Yingying Zhao, Xiaoqun Zhu
Summary: This study focuses on the development of high-performance, low-migration photoinitiators. A polymerizable photoinitiator (VBP) was synthesized by introducing an ethylene group into benzophenone, and three different molecular weight single-component photoinitiators (PVBN1-3) were synthesized based on VBP. The results show that these new photoinitiators have stronger absorption ability compared to benzophenone and significantly reduce the migration of initiators and co-initiators, addressing the safety concerns caused by migration.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Seira Morimune-Moriya, Yuki Iwahashi, Mitsuru Nakamura, Daisuke Ogawa, Keiji Nakamura
Summary: This study investigates the effect of plasma treatment on carbon nanotubes (CNTs) and the structure/properties of polyimide (PI) nanocomposites with ultra-low content of CNTs. The results show that plasma treatment introduces isocyanate groups on the surface of CNTs and enhances the interfacial interaction between PI and treated CNTs. This leads to a significant improvement in the mechanical properties of the nanocomposites, with even a small addition of treated CNTs showing a substantial increase in Young's modulus, tensile strength and toughness.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Yuanlong Li, Chaojie Chen, Guoqing Cui, Li Liu, Chao Zhou, Guangfeng Wu
Summary: In this study, a novel ion-conducting hydrogel was fabricated using a straightforward approach. The hydrogel showed excellent tensile properties and high toughness due to physical interactions and covalent binding. Additionally, the introduction of hydroxyethyl cellulose and lithium chloride improved the biocompatibility, mechanical properties, electrical conductivity, and frost resistance of the hydrogel, demonstrating its potential for cold climate applications.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Dengwei Yan, Jinxian Yang, Xuejun Pan, Xiaozheng Duan, Lianwei Li, Mo Zhu
Summary: The influence of backbone length on grafting efficiency during the graft-onto reaction process was investigated. It was found that the polydispersity effect of backbone length does not affect the final grafting efficiency, indicating that the local dynamics of chain segments dominate the graft-onto process.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Zhaoyi Luo, Xianjie Pan, Fanqi Liu, Quanxi Yi, Yanning Zeng, Yunhua Chen, Chaoyang Wang
Summary: This study provides a method to prepare high-performance epoxy materials with good malleability and thermal stability. The materials have self-healing and welding capabilities, thanks to the addition of specific chemical bonds and network structures. They exhibit mechanical properties comparable to commercial epoxy resins and show great potential for sustainable industrial development.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Chaoji Xiong, Hao Wang, Lihua Deng, Kun Liang, Chunhua Wu, Wei Wu, Qian Chen
Summary: In this study, four polyamides were synthesized and their adsorption performances for Hg2+ in aqueous systems were investigated. The polyamides exhibited high adsorption capacities and excellent reusability, with the involvement of sulfur, nitrogen, and oxygen in the chemical adsorption process of Hg2+.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Siim Laanesoo, Olivier Bonjour, Rauno Sedrik, Iris Tamsalu, Patric Jannasch, Lauri Vares
Summary: The insertion of rigid aliphatic or aromatic building blocks in polymer structures is an effective way to synthesize high -Tg polymer materials. In this study, a series of isosorbide-2-aryl carboxylate-5-methacrylate monomers (ArIMAs) were synthesized by functionalizing isosorbide 5-methacrylate with various aromatic lignin-inspired esters. These monomers were polymerized to obtain high molecular-weight poly(aryl carboxylate isosorbide methacrylates) (PArIMAs). The resulting polymers showed high glass transition temperatures and thermal stability, making them suitable for use as high-performance plastics and coatings.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Yuqian Wu, Weijie Xu, Jianliang Li, Zhangfeng Zhong, Liqing Huang, Shengke Li, Huaping Tan
Summary: This study investigates the improvement of degradation and drug release characteristics of dynamic Schiff base-mediated natural polysaccharide hydrogels using tannic acid (TA), leading to enhanced stability and functionality.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Xi Zhang, Xiangli Kong, Xin Zhou, Yiyan Gao, Yibo Sun, Guanghui Gao, Wei Liu, Kai Shi
Summary: Conductive hydrogels have great development prospects in flexible strain sensors, but long-term direct contact with human skin can cause bacterial infection. A hydrogel with antibacterial, biocompatibility, and toughness was designed and manufactured using a freeze-thaw method. The hydrogel maintains tensile properties and fatigue resistance at low temperatures and is resistant to bacteria. Therefore, hydrogel sensors can be used to monitor human movements.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Wei Zhang, Jiangang Yu, Mingyang Wu, Rui Li, Anqiang Zhang, Yaling Lin
Summary: In this study, polyacrylamide containing quaternary ammonium salts (PAM-X) were synthesized and found to effectively inhibit soil-borne pathogenic fungi while maintaining the balance of microbial population in soil. PAM-X also showed low toxicity to earthworms and fish, providing a new method for the prevention and control of soil-borne fungal diseases.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Jiawen He, Haojie Yu, Li Wang, Jian Yang, Yanhui Zhang, Wenbing Huang, Chenguang Ouyang
Summary: This review discusses the use of polymeric hydrogels for atmospheric water harvesting (AWH), including the mechanism of water sorption, fabrication methods, and strategies for optimizing the structure of hydrogels. The extended applications of hygroscopic photothermal hydrogels, such as agricultural irrigation and dehumidification, are also explored. The challenges and prospects of using polymeric hydrogels for AWH are summarized.
EUROPEAN POLYMER JOURNAL
(2024)
Article
Polymer Science
Ying Du, Shuaishuai Lu, Yuanna Sun, Qingshan Li, Xinhai He
Summary: This study introduces a method to improve the performance of hydrogels by incorporating proline, resulting in hydrogels with excellent stretchability, high conductivity, and long-term stability. The hydrogel remains flexible and conductive even at ultra-low temperatures.
EUROPEAN POLYMER JOURNAL
(2024)
