Article
Chemistry, Physical
Paul Pullara, Ibraheem Alshareedah, Priya R. Banerjee
Summary: Research shows that RNA-polyamine mixtures undergo a reentrant phase separation with temperature, forming a homogenous phase at low temperatures, condensates at higher temperatures, and back to homogenous phase at further increased temperatures. This dual-response phase separation is not unique to polyamines but also observed with short cationic peptides.
Article
Chemistry, Applied
Suzana Goncalves Carvalho, Aline Martins dos Santos, Amanda Leticia Polli Silvestre, Andreia Bagliotti Meneguin, Leonardo Miziara Barboza Ferreira, Marlus Chorilli, Maria Palmira Daflon Gremiao
Summary: The study evaluates the influence of pH, molecular weight, and polymeric proportion on the formation of polyelectrolyte complexes based on chitosan:dextran sulfate. Results showed that nanoparticles with an excess of polycation formed aggregates, while an excess of dextran sulfate reduced the size of the particles. The graph of zeta potential as a function of pH is a promising tool in the choice of polymers and a better pH condition for the development of polyelectrolyte complexes.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Applied
Ni Zhang, Jing Han, Fenglian Chen, Chengcheng Gao, Xiaozhi Tang
Summary: The study investigated the relationships between the preparation, microstructure and interface activity of chitosan/gum arabic complexes, with findings that the interface activity of CS/GA complexes is influenced by CS/GA mass ration, ionic strength and pH.
FOOD HYDROCOLLOIDS
(2022)
Article
Engineering, Environmental
Xujing Guo, Yuyao Peng, Nanxi Li, Yuanyuan Tian, Lichun Dai, Yi Wu, Yang Huang
Summary: The structure and composition of biochar-derived dissolved organic matter varied significantly at different pyrolysis temperatures, impacting the binding properties of Cu(II) onto walnut-shell DOM. The preferential Cu(II) binding with fulvic-like and protein-like substances at different temperatures were observed, suggesting that pyrolysis temperature plays a crucial role in heavy metal behavior. The presence of DOM influenced the adsorption behavior of biochar towards Cu(II).
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Physical
Karolina Polec, Beata Wyzga, Karolina Olechowska, Katarzyna Hac-Wydro
Summary: This study analyzed the influence of mixtures of four terpenes on lipid monolayers and bilayers that mimic bacterial membranes. The results showed that the synergy between the terpenes increased the effect of their mixtures on the membranes compared to individual components. It was also found that the equimolar myrcene/humulene/farnesene/limonene system had the strongest penetration into the monolayer and changed its morphology, as well as increased the fluidity of the bilayer.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Thermodynamics
Jiaheng Yu, Thao T. T. Nguyen, Anisha Pawar, Peter C. Wayner, Joel L. Plawsky, David F. Chao, Ronald J. Sicker
Summary: The Constrained Vapor Bubble (CVB) design was studied in microgravity aboard the ISS, showing how different condenser temperatures affect heat transfer and fluid flow behavior with different working fluids. Results were summarized onto a single Nusselt number vs. Marangoni number curve, showing a decrease in Nusselt number with increasing Marangoni number to the 1/3 power.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(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
Materials Science, Multidisciplinary
Filippo Pascucci, Sara Conti, David Neilson, Jacques Tempere, Andrea Perali
Summary: This study investigates a Josephson junction in an electron-hole superfluid in a double-layer transition metal dichalco-genide heterostructure, and the observation of a critical tunneling current serves as a clear indication of superfluidity. Furthermore, it is observed that the BCS-BEC crossover physics in the narrow barrier region controls the critical current across the entire system, and the corresponding critical velocity reaches its maximum when the excitations transition from bosonic to fermionic. The density at the boundary of the BEC to BCS-BEC crossover regime, determined from the condensate fraction, provides an experimental way to determine the position of this boundary in a semiconductor system.
Article
Polymer Science
Jian Tang, Takuya Katashima, Xiang Li, Yoshiro Mitsukami, Yuki Yokoyama, Ung-il Chung, Mitsuhiro Shibayama, Takamasa Sakai
Summary: Polyelectrolyte gels exhibit swelling behaviors dependent on the external environment and can be explained using specific models. Finite extensibility is a key factor determining the swelling equilibrium of highly charged polyelectrolyte gels. The modified model can effectively reproduce the swelling behavior of various polyelectrolyte gels.
Article
Chemistry, Physical
Jalel M'halla, Sondes Boughammoura, Anis Ghazouani
Summary: The translational dielectric friction effect on polyions, which is often ignored in literature, has a significant impact on the conductibility of polyions. By comparing experimental and theoretical values, the chain conformation of the concerned polyelectrolyte can be predicted.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Sunita Srivastava, Anuj Chhabra, Oleg Gang
Summary: This study investigates the behavior of polyelectrolyte (PE) chains grafted onto spherical gold nanoparticles' surface under different salt environments using in situ small-angle X-ray scattering (SAXS). The results indicate that the brush length of DNA decreases faster with salt concentration in divalent salt environment and leads to chain collapse in trivalent salt environment. The mechanism of the nanoparticle-grafted chain's response to ionic environments involves electrostatic screening and divalent ion bridging.
Article
Chemistry, Physical
Jiaying Li, Krishna B. Ameya, Gerard van Ewijk, Derk Jan van Dijken, Wiebe M. de Vos, Jasper van der Gucht
Summary: In the field of coatings, there is a major trend towards developing water-based alternatives to traditional solvent-based paints in order to reduce volatile organic compounds. Complexes formed by oppositely charged polyelectrolytes have emerged as a promising candidate for such coatings. This study demonstrates the use of an ammonia-evaporation induced complexation approach to form polyelectrolyte complex films of two weak poly-electrolytes. The properties of the films depend strongly on the charge ratio and the resulting films show potential and tunability.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Applied
Saeedeh Hosseini, Mehdi Varidi
Summary: This study evaluated the effects of alginate, chitosan, and CaCl2 on rennet encapsulation and optimized the process using RSM. Encapsulated enzyme showed higher activity at various pH and temperature, and the release mechanism was confirmed to be Fickian.
Article
Polymer Science
Jian Tang, Takuya Katashima, Caidric Indaya Gupit, Xiang Li, Yoshiro Mitsukami, Yuki Yokoyama, Naoyuki Sakumichi, Ung -il Chung, Mitsuhiro Shibayama, Takamasa Sakai
Summary: The swelling behavior of polyelectrolyte gels is influenced by the ambient conditions, including the ionic pressure of the Gibbs-Donnan equilibrium and the conden-sation effect of counterions. This study investigated the swelling properties of polyelectrolyte gels in a divalent CaCl2 salt solution using model polyelectrolyte gels. The results showed that the swelling ratio increased with increasing pH, but the gel showed non-swellability independent of pH with increasing Ca2+ ion concentration.
Article
Materials Science, Multidisciplinary
T. Karabassov, A. A. Golubov, V. M. Silkin, V. S. Stolyarov, A. S. Vasenko
Summary: Superconducting hybrid structures with topological order and induced magnetization show potential for fault-tolerant quantum computation. However, the interplay between magnetization and topological insulator surface properties, known as spin-momentum locking, on the superconducting proximity effect needs further investigation. Results from studying a 2D superconductor/topological insulator junction with helical magnetization on the topological insulator surface show nonmonotonic dependence of critical temperature on thickness, whether the magnetization evolves along or perpendicular to the interface. These findings are valuable for designing novel superconducting nanodevices and understanding superconductivity in systems with nonuniform magnetization.
Article
Biophysics
Simona Sennato, Laura Carlini, Domenico Truzzolillo, Federico Bordi
COLLOIDS AND SURFACES B-BIOINTERFACES
(2016)
Article
Biochemical Research Methods
Elita Montanari, Chiara Di Meo, Simona Sennato, Antonio Francioso, Anna Laura Marinelli, Francesca Ranzo, Serena Schippa, Tommasina Coviello, Federico Bordi, Pietro Matricardi
Review
Chemistry, Physical
Domenico Truzzolillo, Luca Cipelletti
Article
Chemistry, Physical
Francesca Ceccacci, Simona Sennato, Edoardo Rossi, Raffaele Proroga, Stefano Sarti, Marco Diociaiuti, Stefano Casciardi, Valentina Mussi, Alessia Ciogli, Federico Bordi, Giovanna Mancini, Cecilia Bombelli
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2018)
Article
Chemistry, Physical
Domenico Truzzolillo, Simona Sennato, Stefano Sarti, Stefano Casciardi, Chiara Bazzonic, Federico Bordi
Article
Chemistry, Physical
F. Domenici, F. Brasili, L. Oddo, B. Cerroni, A. Bedini, F. Bordi, G. Paradossi
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2019)
Article
Polymer Science
Simona Sennato, Edouard Chauveau, Stefano Casciardi, Federico Bordi, Domenico Truzzolillo
Summary: The study reveals that PNIPAm microgels synthesized in water exhibit different charge characteristics at different temperatures. When collapsed, the charged microgels undergo significant charge reversal and reentrant condensation when co-suspended with oppositely charged polyelectrolytes or nanoparticles, while their stability remains unaffected in their swollen state.
Article
Chemistry, Multidisciplinary
Federica Piccirilli, Franco Tardani, Annalisa D'Arco, Giovanni Birarda, Lisa Vaccari, Simona Sennato, Stefano Casciardi, Stefano Lupi
Summary: The use of halloysite nanotubes as a nanostructured clay for DNA carriers has constraints, but super-resolved infrared spectroscopy proves to be an effective tool for evaluating immobilization processes in drug delivery and gene transfer. DNA molecules undergo significant structural modifications when loaded onto halloysite nanotubes, which have surface properties conducive to the selective loading of biomolecules.
Article
Chemistry, Physical
Serena De Santis, Edoardo Rossi, Marco Sebastiani, Simona Sennato, Edoardo Bemporad, Monica Orsini
Summary: Surface free energy (SFE) of titanium surfaces plays a significant role in tissue engineering, affecting the effectiveness and long-term stability of active coatings and functionalization as well as the establishment of strong bonds to newly growing bone. This study used a high-resolution non-destructive elastic contacting nanoindentation method to investigate the SFE of micro- and nano-structured titanium surfaces, both immediately after preparation and after exposure to air. The effectiveness of different surface treatments in enhancing SFE was evaluated. The study observed a time-dependent decay of SFE within a few hours, with kinetics related to sample preparation. The fast, non-destructive method allowed for accurate measurement of SFE in very hydrophilic conditions, allowing for reliable comparison between surfaces with different properties.
Article
Chemistry, Multidisciplinary
Angela Capocefalo, Thomas Bizien, Simona Sennato, Neda Ghofraniha, Federico Bordi, Francesco Brasili
Summary: This study presents a thorough investigation of a hybrid nanomaterial based on the protein-mediated aggregation of gold nanoparticles. The main factors that determine the assembly process and their strong correlation with the optical properties of the assemblies were established. The calibration curves obtained based on the extinction spectra indicate the notable flexibility of this nanomaterial, enabling the selection of different working ranges with high sensitivity.
Article
Chemistry, Physical
Elvira Maria Bauer, Gabriele Bogliardi, Cosimo Ricci, Daniele Cecchetti, Tilde De Caro, Simona Sennato, Alessandro Nucara, Marilena Carbone
Summary: Extrinsic chemiluminescence is an efficient tool for determining pesticides and fungicides without intrinsic fluorescent signal. In this study, APTMS@ZnO was synthesized and tested as an extrinsic probe for the fungicide penconazole. Different synthetic routes were explored to ensure a green synthesis pathway and a good signal variation for penconazole concentration. The synthesized samples were characterized using various techniques. The chemiluminescence tests showed a good linear response and a low detection limit for penconazole.
Article
Chemistry, Physical
Francesco Brasili, Angela Capocefalo, Damiano Palmieri, Francesco Capitani, Ester Chiessi, Gaio Paradossi, Federico Bordi, Fabio Domenici
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Article
Polymer Science
Marco Palombo, Andrea Barbetta, Cesare Cametti, Gabriele Favero, Silvia Capuani
Summary: Using diffusion NMR, it is possible to quantify subdiffusion and measure the fractal dimension of systems characterized by micro and sub-micro geometrical structures. This method is important for studying highly heterogeneous nanostructured and complex functional materials.