Article
Chemistry, Physical
Lester C. Geonzon, Motoyoshi Kobayashi, Takuya Sugimoto, Yasuhisa Adachi
Summary: The adsorption kinetics of polyelectrolytes on a single particle were investigated, showing that the charge density and salt concentration have an impact on the adsorption behavior. The adsorption process of cationic polyelectrolytes is controlled by attractive interactions, while the adsorption of anionic polyelectrolytes is influenced by repulsion between charged segments and the particle surfaces.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Krzysztof Kolman, Giovanna Poggi, Michele Baglioni, David Chelazzi, Piero Baglioni, Michael Persson, Krister Holmberg, Romain Bordes
Summary: Controlling charge density through pH can avoid flocculation during the layer-by-layer deposition of polyelectrolytes on nanoparticles.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Jiang Zhan, Heyu Sun, Manman Xie, Junping Han, Li Chen, Yiping Zhao
Summary: In this study, composite gels containing sodium alginate/chitosan were prepared with the introduction of chitosan on polyamidoamine. The SCPP-G2 composite gel showed higher stability and greater adsorption capacity for dyes. Chemical adsorption was found to be the dominant mechanism for dye adsorption.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Polymer Science
Ilke Sahin Eguz, Murat Ihlamur, Emrah Sefik Abamor, Murat Topuzogullari
Summary: Polyelectrolytes can be used as adjuvants in subunit vaccine formulations to increase immunogenicity. Linear conjugates of polyacrylic acid (PAA) with an antigenic peptide sequence of the HPV-16 E7 oncoprotein were produced in this study, showing high conjugation efficiency and biocompatibility, stimulating macrophages to release high levels of nitric oxide.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Ilke Sahin Eguz, Murat Ihlamur, Emrah Sefik Abamor, Murat Topuzogullari
Summary: Polyelectrolytes can be used as adjuvants in subunit vaccine formulations to enhance the immunogenicity of antigenic molecules. In this study, linear conjugates of polyacrylic acid and an antigenic peptide sequence of the HPV-16 E7 oncoprotein were successfully produced. These conjugates showed high biocompatibility and stimulated macrophages to release high levels of NO.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Chemistry, Analytical
Qais M. Al-Bataineh, Ahmad D. Telfah, Victoria Shpacovitch, Carlos J. Tavares, Roland Hergenroeder
Summary: Imaging wide-field surface plasmon resonance (SPR) microscopy sensors based on polyacrylic acid polyelectrolyte brushes (PAA PEBs) were designed to enhance the sensitivity of nano-object detection. The switching behavior of the PAA PEBs against changes in the pH values was investigated. Coating a Au-layer with PAA PEBs enhances the sensitivity of the SPR sensing device, and improves the spatial resolution of the recorded image.
Article
Construction & Building Technology
Jakuja Mzwandile, Mbasha Willy, Haldenwang Rainer
Summary: Self-compacting concrete (SCC) is widely used due to its high-performance, which is attributed to the integral stability of its components driven by the cement paste rheology and viscosity of the overall suspension. This study explores that the stability of self-compacting cement mortar depends not only on the cement suspension viscosity but also on the yield stress of the cement paste. Higher yield stress pastes result in more stable suspensions, while lower yield stresses lead to unstable mortars with higher segregation. No correlation is found between rheological parameters and bleeding.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Fu-Qi Mi, Fa-Xue Ma, Shui-Xiang Zou, Dong-Sun Zhan, Teng Zhang
Summary: The metal-organic framework (MOF) demonstrated excellent chemical stability in acids, bases, and boiling water, as well as high hydrophilicity. It also showed a proton conductivity of 1.14 x 10(-3) S cm(-1) at 90 degrees C and 98% RH, suggesting a vehicle mechanism for proton transport.
DALTON TRANSACTIONS
(2022)
Article
Biotechnology & Applied Microbiology
Amina Bibi, Shazia Bibi, Mohammed Abu-Dieyeh, Mohammad A. Al-Ghouti
Summary: In this study, the removal of phenol from synthetic and real wastewater using a new polyacrylic acid-modified graphene oxide (GO-PAA) composite material was investigated. Results showed that the adsorption capacity of GO-PAA was double compared to un-modified GO, and under the optimum conditions (pH 2 and 25°C), GO-PAA was able to remove approximately 75% of phenol from synthetic wastewater. These findings suggest that adsorption using GO-PAA could be an effective and simple method for remediating pollution, especially in acidic conditions.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Biochemistry & Molecular Biology
Marvin Detert, Tatiana Porto Santos, Amy Q. Shen, Vincenzo Calabrese
Summary: The relationship between the alignment of biosourced rod-like colloids (RC) and rod-like polymers (RP) and the rheological properties of the fluid is investigated. It is found that the alignment of RC and RP contributes to the viscosity of the fluid in a consistent manner across different systems, independent of concentration. A dimensionless parameter (& beta;) directly proportional to the specific viscosity (& eta;(sp)) at zero shear rate (& eta;(0,sp)) is also identified.
Article
Engineering, Chemical
Vitalis Chipakwe, Tommy Karlkvist, Jan Rosenkranz, Saeed Chehreh Chelgani
Summary: This study investigates the effects of polyacrylic-based grinding aids (ZaltaTM GR20-587: AAG) on the grinding performance and quartz flotation from magnetite. It is found that the use of AAG can reduce energy consumption, produce a finer and more uniform product, and enhance quartz collection and magnetite recovery.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ashley R. Bielinski, Emily A. Sprague-Klein, Brian T. Phelan, Alex B. F. Martinson
Summary: This study developed a pyroelectric calorimeter to quantitatively detect the heat generated by ALD reactions, with the most effective design used to measure the heat produced by a specific reaction. The sensitive and ultrafast probe can potentially enhance our fundamental understanding of numerous ALD reaction mechanisms through quantitative comparison with computational predictions.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Vishnu Arumughan, Tiina Nypelo, Merima Hasani, Anette Larsson
Summary: This review article discusses the non-covalent modification of cellulose fibers through the adsorption of functional polymers, focusing on fundamental aspects of polymer adsorption on cellulose surfaces. The correlation of adsorption findings with the Scheutjens-Fleer polymer adsorption theory provides insight into the phenomenon and its context in utilizing cellulose fibers. Studies on model surfaces and cellulose macro-fibers are reviewed to understand the potential of using this approach for tailored material properties.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Kenta Kitamura, Yuto Mochizuki, Takamasa Mori
Summary: This study investigated the effects of polyelectrolyte on aqueous alumina slurries and found that the amount of added polyelectrolyte determines the long-term dispersion state of the slurries. The research results show that the amount of polyelectrolyte added plays a crucial role in the dispersion state of the slurries.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Mohamed Brahmi, Kamal Essifi, Nurgul Karadas Bakirhan, Ali EL Bachiri, Sandrine Delpeux Ouldriane, Abdesselam Tahani
Summary: This study investigates the binding mechanism between alginate and chitosan in the presence of montmorillonite nanoparticles using a layer-by-layer approach. The results show that the formation of the complex is pH-dependent, with the highest intercalation observed when chitosan is added first at a lower pH. The presence of montmorillonite enhances the thermal stability of the complex, and this stability is dependent on both pH and the order of addition of the biopolymers. This study provides valuable insights into the formation mechanism of alginate-chitosan complexes in the presence of montmorillonite nanoparticles and suggests that combining biopolymer-based complexes with clay particles can lead to a low-cost, more stable, and effective nanocomposite for encapsulation and delivery of active agents.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Nanoscience & Nanotechnology
Agnieszka Nosal-Wiercinska, Marlena Martyna, Slawomira Skrzypek, Anna Szabelska, Malgorzata Wisniewska
Summary: This paper discusses the electroreduction of Bi(III) ions by expanding the cap-pair effect and its association with organic substances. The study reveals that the supporting electrolyte concentration, electrochemical active type, and protonated organic substances can influence the acceleration process. Furthermore, the phenomena at the electrode/solution interface can impact the dynamics of the electrode's process according to the cap-pair rule.
APPLIED NANOSCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Iryna Sulym, Malgorzata Wisniewska, Liudmyla Storozhuk, Konrad Terpilowski, Dariusz Sternik, Mykola Borysenko, Anna Derylo-Marczewska
Summary: A series of highly dispersed nanocomposites were synthesized using a liquid-phase method, resulting in amorphous particles with a sphere-like morphology of uniform size and shape post-calcination at different ratios. The agglomerated particles of nanocomposites in the aqueous medium ranged from 200 to 850 nm, showing good stability.
APPLIED NANOSCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Malgorzata Wisniewska, Dariusz Sternik, Piotr Nowicki, Stanislaw Chibowski, Magdalena Medykowska, Marlena Geca, Katarzyna Szewczuk-Karpisz
Summary: The thermal analysis methods were used to describe the adsorption behavior of different proteins on activated biocarbon, indicating that proteins with smaller hydrodynamic radius showed higher adsorption capacity at specific pH values close to their pI values.
APPLIED NANOSCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Malgorzata Wisniewska, Stanislaw Chibowski, Monika Wawrzkiewicz, Magda Onyszko, Viktor Bogatyrov
Summary: The global production of colored products and intermediates is increasing year on year, leading to an increase in toxic dyes entering the aquatic environment. This study explored the potential of using a carbon and silica (C/SiO2) composite for removing the azo dye C.I. Basic Red 46 (BR46), finding that the adsorption capacity was temperature dependent. The adsorption of cationic dye and surfactants influenced the structure of the electrical double layer at the solid-liquid interface.
Article
Engineering, Chemical
Malgorzata Wisniewska, Gracja Fijalkowska, Katarzyna Szewczuk-Karpisz, Karolina Herda, Stanislaw Chibowski
Summary: This paper investigates the adsorption mechanism of ionic polyacrylamides (PAMs) with different functional group contents on clay minerals, and compares the adsorption efficiency and stability of the clay mineral-polymer-heavy metal system. The study finds that the mixed PAM+heavy metal adsorption layers significantly modify the surface properties of clay minerals, leading to the destabilization of the solid suspension and its separation from the liquid phase.
Article
Chemistry, Physical
Malgorzata Wisniewska, Magdalena Marciniak, Marlena Geca, Karolina Herda, Robert Pietrzak, Piotr Nowicki
Summary: This study investigates the adsorption properties of heavy metal ions on carbonaceous materials obtained through the chemical activation of biomass. The effects of different precursors and preparation procedures on the physicochemical properties and sorption abilities of the activated biocarbons were examined. The study provides valuable insights into the mechanism of heavy metal binding on the surface of activated biocarbons and contributes to the understanding of heavy metal removal in water treatment.
Article
Environmental Sciences
Magdalena Konczak, Paulina Godlewska, Malgorzata Wisniewska, Patryk Oleszczuk
Summary: This study examines the effects of biochar derived from sewage sludge (BCSSL) or sewage sludge/biomass (BCSSLW) on the persistence and bioavailability of polycyclic aromatic hydrocarbons (PAHs) in soils with different properties. The results show that the content of organic solvent extractable PAHs decreases when biochar is applied to the soils, depending on pH and feedstock. Similarly, the content of freely dissolved PAHs also decreases. The bioavailability and persistence of PAHs in the biochar-amended soils are closely related to the chemical properties of the soils, as indicated by the significant relationships between PAH content and pH, cation exchange capacity, available nutrients, and dissolved organic carbon.
ENVIRONMENTAL POLLUTION
(2023)
Article
Biochemistry & Molecular Biology
Malgorzata Wisniewska, Kacper Rejer, Robert Pietrzak, Piotr Nowicki
Summary: This study focused on the preparation of biochars and activated biocarbons through pyrolysis and activation methods using mugwort plant residue. The properties of the resulting carbonaceous materials, including elemental composition, surface characteristics, and adsorption abilities, were investigated. The research also explored the potential use of the prepared biochars as renewable fuels.
Article
Chemistry, Physical
Marlena Geca, Malgorzata Wisniewska, Teresa Urban, Piotr Nowicki
Summary: The study aimed to investigate the effects of temperature on the adsorption mechanisms of PAA and PEI on activated carbon surfaces obtained from nettle and sage herbs. Measurements were conducted at pH 3 and three temperature values. Adsorption/desorption of the polymers from single and mixed adsorbate solutions were also studied. The viscosity studies provided important data on the conformation of the polymer chains in solution. XPS studies were carried out on the systems with the highest adsorption capacity. Thermodynamic parameters were calculated to further analyze the adsorption process.
Article
Chemistry, Physical
Malgorzata Wisniewska, Natalia Pawlak, Dariusz Sternik, Robert Pietrzak, Piotr Nowicki
Summary: This research investigates the adsorption of organic and inorganic pollutants on carbonaceous adsorbents prepared from expired or broken food products. The activation process was conducted using potassium carbonate and orthophosphoric acid as activating agents. The activated carbons were characterized and their suitability as adsorbents for methylene blue and iodine removal from aqueous solutions was evaluated. The materials activated with H3PO4 showed higher effectiveness in both pollutant adsorptions. The Langmuir isotherm model provided a better fit for the experimental adsorption data for all carbonaceous materials compared to the Freundlich model.
Article
Biochemistry & Molecular Biology
Agata Wawrzyniak, Malgorzata Wisniewska, Piotr Nowicki
Summary: Water resources are being degraded by waste discharge from urban, industrial, and agricultural areas. This study investigates the use of carbonaceous adsorbents derived from pistachio nut shells to effectively treat drinking water and sewage by adsorbing organic and inorganic pollutants. The activation method and properties of the carbonaceous materials are examined, and their efficiency in adsorbing iodine, methylene blue, and poly(acrylic acid) from aqueous solutions is evaluated. The results show that the sample prepared through chemical activation is more effective in adsorbing all tested pollutants, with maximum sorption capacities of 1059 mg/g for iodine, 183.1 mg/g for methylene blue, and 207.9 mg/g for poly(acrylic acid).
Article
Biochemistry & Molecular Biology
Malgorzata Wisniewska, Amanda Sadlowska, Karolina Herda, Teresa Urban, Piotr Nowicki
Summary: The objective of this study was to assess the usability of low-quality brown coal ash and used gear oil for the production of mineral-carbon adsorbents. The adsorbents were characterized and their suitability for drinking water purification was tested. The results showed that the efficiency of organic dye removal primarily depended on the adsorbent and adsorbate used.
Review
Chemistry, Physical
Marlena Geca, Ahmed M. Khalil, Mengqi Tang, Arvind K. Bhakta, Youssef Snoussi, Piotr Nowicki, Malgorzata Wisniewska, Mohamed M. Chehimi
Summary: In recent years, biochar has gained recognition as a valuable biosourced material for tackling global challenges in various fields. This review focuses on the surface treatment of biochar using silane and other coupling agents, and summarizes the recent progress in this area. The correlation between the nature and extent of functionalization and the end applications of surface-engineered biochar is also discussed.
Article
Environmental Sciences
Kacper Latusek, Teresa Urban, Justyna Ulatowska, Izabela Polowczyk, Piotr Nowicki, Malgorzata Wisniewska
Summary: The aim of this research was to investigate the adsorption-desorption, surface, electrokinetic, and stability properties of iron-containing minerals in the presence of anionic polyacrylamide (AN PAM) and lead(II) ions. Three minerals, akaganeite, goethite, and magnetite, were synthesized using precipitation method. The interaction mechanism of heavy metal ions with polymer flocculant on soil mineral particles was proposed. The results showed that akaganeite had the highest affinity for AN PAM and/or Pb(II), adsorbing both from single and mixed solutions. Polymer-metal complexes formed in the mixed adsorbate systems were stable, reducing the desorption and bioavailability of toxic lead ions in the soil environment.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Magdalena Medykowska, Malgorzata Wisniewska, Stanislaw Chibowski
Summary: The main purpose of this study was to investigate the mechanisms of protein adsorption on porous materials and the effects of common environmental contaminants. The results showed that Na-X zeolite was an effective adsorbent for protein removal, with the highest adsorption at pH values close to the protein's isoelectric point.
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.
