Article
Polymer Science
Takayuki Takei, Rio Tomimatsu, Takanori Matsumoto, Kamalalayam Rajan Sreejith, Nam-Trung Nguyen, Masahiro Yoshida
Summary: The unique properties and morphology of liquid marbles make them potentially useful for various applications. In this study, hydrophobically modified gelatin was used as the base material for particles, and the effect of surface tension and liquid-over-solid spreading coefficient on the formation of liquid marbles was investigated.
Article
Polymer Science
Fabio Bignotti, Francesco Baldi, Mario Grassi, Michela Abrami, Gloria Spagnoli
Summary: This work presents a novel method to synthesize hydrophobically-modified hydrogels, which exhibit thermosensitive behavior and enhanced properties when the HLB decreases, especially when wp exceeds 10%. The decrease in HLB results in an increase in polymer weight content and improvement in mechanical properties due to the occurrence of physical crosslinking.
Article
Chemistry, Physical
Salah Eddine Ghellab, Xiaojun Han
Summary: Biomolecular self-assembly is crucial in the life system. In this study, double-helical phospholipid-modified carbon nanotube structures were created through the self-assembly of phospholipids on carbon nanotubes. These micrometer size spring structures may have potential applications in biocompatible microrobots.
Article
Chemistry, Physical
M. Pilkowski, G. Morgiante, J. Mysliwiec, M. Kuchowicz, J. Marczak
Summary: Surface wettability is crucial in coating science, and developing non-wettable materials has promising applications. Research on vapor phase modification of glass and silica substrates provided insight into chemical composition, roughness changes, and the effects of temperature and humidity on modified surfaces. Conducted studies contribute to a deeper understanding of surface properties and environmental durability of modified materials such as nanocomposites and coatings.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Julie Chanut, Yiqian Wang, Irene Dal Cin, Regis D. Gougeon, Eric Ferret, Jean-Pierre Bellat, Thomas Karbowiak
Summary: The surface tension of cork is determined to be 22.6 (+/- 1.2) mN.m(-1), with a polar component at 5.2 (+/- 0.5) mN.m(-1) and a dispersive component at 17.4 (+/- 1.6) mN.m(-1). Cork exhibits an intermediate hydrophobic/hydrophilic behavior with a water contact angle of around 90 degrees.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Liling Jing, Pengfei Yang, Xiaoli Lu, Haoran Tian, Jinlong Mao, Junying Li, Feng Ma, Zhiliang Zhang
Summary: In this study, benzophenone derivatives with hydrophobic perfluorooctyl groups were synthesized and covalently grafted onto commercial filter papers to create cellulose-based materials with excellent hydrophobicity. These modified filter papers were capable of efficiently separating various oil-water mixtures and surfactant-stabilized water-in-oil emulsions, showing potential for large-scale industrial applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Katarzyna Szymczyk, Andrzej Lewandowski, Anna Zdziennicka, Magdalena Szaniawska, Bronislaw Janczuk
Summary: This study investigated the behavior of Auramine O (AuO) at the water-air interface and in aqueous solution of Kolliphor (R) ELP (ELP) and Kolliphor (R) RH 40 (RH40) and their mixture. Measurements of contact angle, surface tension, density, and fluorescence intensity were used to determine the components and parameters of AuO, ELP, RH40, and their mixed monolayer and mixed micelles. The Gibbs standard free energy of adsorption, micellization, and AuO solubilization were also determined. The obtained results suggested that the surface tension isotherms of the solutions could be described by mathematical equations and the composition of the mixed surface layer could be predicted based on the contribution of its components to the reduction of water surface tension.
Article
Chemistry, Physical
Manuel Kerscher, Julius H. Jander, Junwei Cui, Max M. Martin, Moritz Wolf, Patrick Preuster, Michael H. Rausch, Peter Wasserscheid, Thomas M. Koller, Andreas P. Froeba
Summary: The thermophysical properties of binary mixtures of diphenylmethane with benzophenone were investigated. It was found that the addition of benzophenone increased the density, surface tension, and viscosity of the mixture. The viscosity showed a distinct change in the temperature dependence during the transition from the liquid to the supercooled liquid state. Additionally, water dissolved in benzophenone had a significant impact on the viscosity and surface tension.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Olasehinde Owoseni, Yang Su, Srinivasa Raghavan, Arijit Bose, Vijay T. John
Summary: The integration of cationic and hydrophobic functionalities into hydrophobically modified chitosan (HMC) biopolymer facilitates complementary emulsion stabilization with negatively charged halloysite clay nanotubes (HNT). The adsorption of the cationic HMC onto the negatively charged HNT modifies the surface wettability of the nanotubes, facilitating the attachment of the nanotubes to the oil-water interface. Hydrophobic interaction, insertion of HMC hydrophobes into the oil phase, and electrostatic interactions between HMC and HNT are proposed as key mechanisms driving the increased emulsion stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Qi Sun, Fu-Tang Hu, Lu Han, Xiu-Yu Zhu, Fan Zhang, Gui-Yang Ma, Lei Zhang, Zhao-Hui Zhou, Lu Zhang
Summary: This paper studied the influences of different surfactants on the viscosity of two polymers, HPAM and HMPAM, and conducted experiments in different reservoir environments. The results showed that surfactants acted as electrolytes to reduce the viscosity of HPAM, while they formed aggregates with the hydrophobic blocks of HMPAM molecules, reducing the bulk viscosity. However, zwitterionic surfactant BSB was able to build bridges between different polymer molecules through hydrogen bonding and electrostatic interaction, resulting in an increase in viscosity.
Article
Chemistry, Multidisciplinary
Bingbing Xu, Quhui Zhang
Summary: In this study, nano-SiO2 was modified with HDTMS to enhance its hydrophobicity, resulting in a superhydrophobic surface with a water contact angle over 170 degrees. The novelty of this work lies in achieving such high WCA values and analyzing the modification mechanism using 2D-COS, providing insights for the hydrophobic modification of nano-SiO2 and expanding its application field.
Article
Chemistry, Physical
Norah Alwadani, Nasim Ghavidel, Pedram Fatehi
Summary: In this study, lignin was modified via methylation and grafting with dodecyl glycidyl ether to improve its hydrophobicity, reducing water uptake and potentially making it more attractive for applications in coating and packaging. Analyses showed successful reduction in lignin dissolution in water and fundamental water absorption behavior by the films.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Jotam Bergfreund, Pascal Bertsch, Peter Fischer
Summary: Protein adsorption at fluid interfaces is influenced by the hydrophobicity of the subphase, with hydrophobic substances accelerating adsorption speed while more polar oils slow it down. The stability of protein structures also plays a role in determining adsorption rates, with less stable globular proteins adsorbing more quickly. The correlation between oil polarity and induced surface pressure of proteins is a universal principle that can be used to predict protein unfolding based on protein-subphase interactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Youichi Takata, Amu Uchikura
Summary: Solubilization plays a crucial role in dissolving hydrophobic materials in water. This study focuses on controlling solubilization and release of solubilized materials through external stimulation. An amphoteric surfactant, SB-12, was used and pH change was chosen as the external stimulus. Surface tension and absorbance measurements revealed that pH had minimal effect on the adsorption behavior and micelle formation of SB-12, whereas solubilization behavior depended significantly on pH. Moreover, the solubilization ability was much greater under basic conditions compared to acidic or neutral conditions. This study provides insights into the mechanism of release for solubilized materials due to pH change.
Article
Mechanics
Guang Yang, Pengyu Pei, Cheng Huang, Ming Dai
Summary: The study presents a modified closed-form solution for the problem of a finite interface rigid line between two bonded half-planes under remote in-plane heat flux in the context of linear plane thermoelasticity. The modified solution incorporates the influence of the expansion of the rigid line caused by thermal load and successfully derives an explicit closed-form expression for the holomorphic function. The study also easily recovers existing results for simpler cases in the literature.
Article
Environmental Sciences
Asmaa Bouyahya, Berthe-Sandra Sembo-Backonly, Audrey Favrelle-Huret, Sebastien Balieu, Frederic Guillen, Valerie Mesnage, Carole Karakasyan-Dia, Mohammed Lahcini, Didier Le Cerf, Geraldine Gouhier
Summary: A new hybrid material was developed through innovative supramolecular tripartite association, showing excellent inclusion properties and extraction efficiency, which is significant for green analytical chemistry.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Polymer Science
Mathieu Madau, Gaelle Morandi, Vincent Lapinte, Didier Le Cerf, Virginie Dulong, Luc Picton
Summary: HA-based thermo-responsive hydrogels were obtained through functionalization with PiPrOx-co-PnBuOx copolymers. The hydrogel transition temperature can be controlled by varying the monomeric composition.
Article
Chemistry, Multidisciplinary
Meriem Aitouguinane, Zainab El Alaoui-Talibi, Halima Rchid, Imen Fendri, Slim Abdelkafi, Mohamed Didi Ould El-Hadj, Zakaria Boual, Pascal Dubessay, Philippe Michaud, Didier Le Cerf, Christophe Rihouey, Guillaume Pierre, Cedric Delattre, Cherkaoui El Modafar
Summary: Sulfated glycoproteins extracted from Moroccan green seaweed can induce natural defense metabolism in tomato seedlings. These extracts stimulate phenylalanine ammonia-lyase activity, polyphenol accumulation, and lignin content increase.
APPLIED SCIENCES-BASEL
(2022)
Article
Biochemistry & Molecular Biology
Martin Souce, Ali Tfayli, Veronique Rosilio, Ioannis Nicolis, Athena Kasselouri
Summary: In this study, the incorporation of two photosensitizing drugs, Temoporfin and Verteporfin, into a model membrane was investigated. The results showed that Temoporfin significantly affected the stretching vibrations of the membrane, while Verteporfin had a smaller impact and mainly remained at the polar interface of the membrane.
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
(2023)
Article
Biochemistry & Molecular Biology
Mengli Ding, Jingwen Qiu, Stephan Rouziere, Christophe Rihouey, Luc Picton, Ruxandra Gref
Summary: Due to their flexible composition, large surface areas, versatile surface properties, and degradability, nanoscale metal organic frameworks (nano MOFs) are drawing significant attention in nanomedicine. In particular, iron trimesate MIL-100 (Fe) is extensively studied in drug delivery. The challenging synthesis of room-temperature (RT) MIL100 has been addressed by using acetic acid as a modulator and non-toxic cyclodextrin-based coatings for stability. RT MIL100 obtained using acetic acid showed good colloidal stability, low cytotoxicity, and high drug payload efficiency, making it suitable for cancer therapy.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
David Chapron, Juan Chen, Gang Zheng, Veronique Rosilio
Summary: Photodynamic therapies combine the action of a photosensitizer, molecular oxygen, and light to destroy infectious sites and tumors. Incorporating photosensitizers in nanocarriers allows better control of their distribution in tissues and increases concentration in the illuminated area. This study highlights the importance of characterizing the interfacial properties of porphyrin derivatives and their interaction with the oil to design stable nanoemulsions with well-controlled optical properties.
Article
Chemistry, Medicinal
Meriem Aitouguinane, Zainab El Alaoui-Talibi, Halima Rchid, Imen Fendri, Slim Abdelkafi, Mohamed Didi Ould El-Hadj, Zakaria Boual, Didier Le Cerf, Christophe Rihouey, Christine Gardarin, Pascal Dubessay, Philippe Michaud, Guillaume Pierre, Cedric Delattre, Cherkaoui El Modafar
Summary: The study investigated the ability of alginates extracted from two Moroccan brown seaweeds and their derivatives to induce phenolic metabolism in tomato seedlings. Elicitation was done by foliar spraying the seaweed alginates on tomato seedlings and evaluating their effects on PAL activity, polyphenol, and lignin production. It was found that low-molecular-weight alginates were more effective in inducing natural defenses in tomato seedlings compared to the alginate polymers. These findings suggest that low-molecular-weight alginates may have potential as a stimulant for plant natural defenses.
Article
Polymer Science
Gwendoline Christophe, Xiaoyang Hou, Emmanuel Petit, Mounir Traikia, Didier Le Cerf, Christophe Rihouey, Christine Gardarin, Cedric Delattre, Philippe Michaud, Guillaume Pierre, Pascal Dubessay
Summary: This study identified Peteryoungia rosettifformans as a wild producer of an exopolysaccharide related to glucuronan. Structural and biochemical analyses revealed that the polysaccharide had a molecular mass of 1.85 x 10(5) Da and was partially O-acetylated at C-2 and/or C-3 positions. The concentration of Mg2+ ions in the cultivation medium was found to impact the structure of the polysaccharide.
Article
Pharmacology & Pharmacy
Huu Van Le, Virginie Dulong, Luc Picton, Didier Le Cerf
Summary: The lyophilization of nanogels allows for long-term conservation and adjustment of their concentration and dispersant type. This study investigated the effects of formulation aspects on the integrity of polyelectrolyte complex nanogels after lyophilization and reconstitution. The best approach for freeze-drying thermoresponsive PEC-NGs was determined, and it was found that freeze-drying PEC-NG suspensions prepared at a relatively low polymer concentration with trehalose as a cryoprotectant allowed for homogeneous redispersion of PEC-NGs without significant aggregation.
Article
Biochemistry & Molecular Biology
Manel Sfar, Ghada Souid, Fahad M. M. Alminderej, Zeineb Mzoughi, Yassine El-Ghoul, Christophe Rihouey, Didier Le Cerf, Hatem Majdoub
Summary: This study investigated the extraction of polysaccharides from coriander seeds and evaluated their antioxidant and hepatoprotective effects. The structural characterization of the polysaccharide was performed, showing its composition and properties. Results demonstrated that the polysaccharide exhibited significant inhibition of cadmium-induced oxidation damage and protection against Cd hepatocytotoxicity by reducing MDA production and increasing CAT and SOD enzyme levels.
Article
Infectious Diseases
Hung Le, Emmanuelle De, Didier Le Cerf, Carole Karakasyan
Summary: Developing novel antibiotic delivery strategies is essential to increase the bioavailability of antibiotics at infection sites. In this study, fluoroquinolone antibiotics ciprofloxacin and levofloxacin were encapsulated into polymer-based nano-carriers with anti-staphylococcal antibodies as ligand molecules. The targeted nano-antibiotic showed enhanced antimicrobial activity against S. aureus in both planktonic and biofilm forms compared to free-form antibiotic. The release profile of the targeted nano-antibiotic treatment was found to influence its efficacy.
Article
Chemistry, Multidisciplinary
Manel Sfar, Ghada Souid, Zeineb Mzoughi, Didier Le Cerf, Hatem Majdoub
Summary: Polysaccharides from F. vulgare seeds were characterized and found to have antioxidant activity, reducing oxidative damage and hepatotoxicity induced by cadmium. These findings suggest that FPS could be a potential natural antioxidant for the treatment of hepatic diseases.
CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY
(2023)
Article
Biotechnology & Applied Microbiology
Claire Toucheteau, Valentine Deffains, Clement Gaignard, Christophe Rihouey, Celine Laroche, Guillaume Pierre, Olivier Lepine, Ian Probert, Didier Le Cerf, Philippe Michaud, Ingrid Arnaudin-Fruitier, Nicolas Bridiau, Thierry Maugard
Summary: This study isolated and depolymerized exopolysaccharides (EPS) from different microalgae, characterized their structural features, and investigated their effects on collagen activity. The depolymerized EPS forms enhanced collagen production, and the inhibition of collagenase activity was strongly correlated to the sulfate group content of EPS. These findings provide new insights into the dermo-cosmetic potential of microalgae EPS.
Article
Chemistry, Multidisciplinary
Louis-Gabriel Bronstein, Agota Toth, Paul Cressey, Veronique Rosilio, Florent Di Meo, Ali Makky
Summary: The assembling mechanism and molecular organization of phospholipid-porphyrin conjugates (PL-Por) and their impact on optical properties were studied. The research found that the interaction between porphyrin cores plays a central role in controlling the structure of lipid bilayer membranes. These findings provide guidance for the design of new PL-Por conjugates with tunable morphology and optical properties.
