A5018685135- Surfactants and Colloidal Systems
- Advanced Polymer Synthesis and Characterization
- Analytical Chemistry and Chromatography
- Petroleum Processing and Analysis
- Chemical and Physical Properties in Aqueous Solutions
- Enhanced Oil Recovery Techniques
- Pickering emulsions and particle stabilization
- Hydrocarbon exploration and reservoir analysis
- Crystallization and Solubility Studies
- Advanced Cellulose Research Studies
- Protein Interaction Studies and Fluorescence Analysis
- Lipid Membrane Structure and Behavior
- Polymer Surface Interaction Studies
- Proteins in Food Systems
- Electrostatics and Colloid Interactions
- Photochemistry and Electron Transfer Studies
- Hydrogels: synthesis, properties, applications
- Thermodynamic properties of mixtures
- thermodynamics and calorimetric analyses
- Chemistry and Chemical Engineering
- Spectroscopy and Quantum Chemical Studies
- Semiconductor materials and devices
- Nanoparticle-Based Drug Delivery
- NMR spectroscopy and applications
- Analytical Chemistry and Sensors
Universidade Estadual de Campinas (UNICAMP)
2016-2025
Brazilian Computer Society
2016
Arab Foundations Forum
2014-2015
Institut de Recherches sur la Catalyse et l'Environnement de Lyon
2013
Johns Hopkins University
2013
Atkins (United States)
2013
University of Oxford
2013
Technical University of Denmark
2013
TU Dortmund University
2013
Fudan University
2013
Unconventional oils - mainly heavy oils, extra and bitumens represent a significant share of the total oil world reserves. Oil companies have expressed interest in unconventional as alternative resources for energy supply. These are composed usually viscous and, this reason, their use requires additional efforts to guarantee viability recovery from reservoir its subsequent transportation production wells ports refineries. This review describes main properties high-viscosity crude well...
The nature of the interactions between 1,3-dialkylimidazolium cations and noncoordinating anions such as tetrafluoroborate, hexafluorophosphate, tetraphenylborate has been studied in solid state by X-ray diffraction analysis solution (1)H NMR spectroscopy, conductivity, microcalorimetry. In state, these compounds show an extended network hydrogen-bonded which one cation is surrounded at least three anion imidazolium cations. pure form, salts are better described polymeric supramolecules type...
Properties of nonionic triblock copolymers poly(ethylene oxide) (PEO) and poly(propylene (PPO) (EOnPOmEOn) in aqueous solution their interaction with the ionic surfactants sodium dodecyl sulfate hexadecyltrimethylammonium chloride have been investigated by static dynamic light scattering, high sensitivity differential scanning, isothermal titration calorimetry. The studied (denoted P123 F127) same hydrophobic PPO central block (m = 68), but different length endblocks, n 20 97. At 40 °C, are...
Recent studies have pointed out the importance of polyelectrolyte assembly in elaboration innovative nanomaterials.
ADVERTISEMENT RETURN TO ISSUEEditorialNEXTArtificial Intelligence (AI) for Sustainable Resource Management and Chemical ProcessesMilad KamkarMilad KamkarMore by Milad Kamkarhttps://orcid.org/0000-0002-6822-7370, Kevin C. LeonardKevin LeonardMore Leonardhttps://orcid.org/0000-0002-0172-3150, Ivet FerrerIvet FerrerMore Ferrerhttps://orcid.org/0000-0002-4568-4843, Say Chye Joachim LooSay LooMore Loohttps://orcid.org/0000-0001-5300-1275, Elizabeth J. BiddingerElizabeth BiddingerMore...
Critical micelle concentrations (cmc) were determined for aqueous solutions of 15 EO−PO−EO (EO = ethylene oxide, PO propylene oxide) block copolymers by using three different techniques: spectral changes an iodine/iodide mixture, methyl yellow solubilization, and surface tension measurements. Two polymers showed no sign formation up to phase separation: one reverse (PO−EO−PO) the other with low EO/PO ratio. The obtained cmc's consistent techniques employed allowed determination ΔG values...
Oxidized alginate (ADA) and oxidized blended with chitosan (ADA-Chit) were prepared in the presence of borax CaCl2, their interactions an antifolate drug, pyrimethamine (PYR), have been investigated. Tablets a mean diameter 1.2 ± 0.06 cm produced drug performed dimethyl sulfoxide (DMSO) using isothermal titration calorimetry (ITC). From ITC responses, enthalpy changes interaction PYR/materials, ΔintH, determined found to be −11.73 0.517 kJ mol−1 for ADA −4.86 0.156 ADA-Chit. The PYR...
We report a comprehensive study on the interactions between cationic surfactant homologues CnTAB (n = 12, 14, and 16) with negatively charged cellulose nanocrystals (CNCs). By combining different techniques, such as isothermal titration calorimetry (ITC), surface tension, light scattering, electrophoretic mobility, fluorescence anisotropy measurements, we identified two driving forces for formation of induced micellar aggregates. For C12TAB surfactant, monolayer alkyl chains exposed to water...
Using advanced nanotechnology membranes has opened up new possibilities in the field of biomedicine, particularly for controlled drug delivery and especially topical use. Bacterial cellulose (BCM), particular, have gained prominence owing to their distinctive attributes, including remarkable water retention, safety, biodegradability, tunable gas exchange. However, they are aqueous matrices and, this reason, limited capacity incorporation apolar compounds. Cubosomes lipid nanoparticles...
Complex coacervates result from an associative phase separation commonly involving oppositely charged polyelectrolytes. When this interaction occurs between charged-neutral diblock copolymers and homopolymers, a nanometric aggregate called complex coacervate core micelle, C3M, is formed. Recent studies have addressed the issue of their thermodynamic or kinetic stability but without clear consensus. To further investigate issue, we studied C3Ms formed by combination...
The evolution of ternary mixtures containing water, poly(ethylene oxide) (PEO) and dextran or electrolytes (NaCl, Na2SO4 Li2SO4), toward the formation aqueous two-phase systems was investigated by calorimetry measuring enthalpies solution for one components in water an other component. These values were then analyzed as transfer from to second component, probe energy balance solvation transferred component between both states. obtained results confirmed that enthalpic contributions are...
The interaction between three triblock copolymers of poly(ethylene oxide) and poly(propylene oxide), EOnPOmEOn, the ionic surfactants sodium dodecyl sulfate, SDS, hexadecyltrimethylammonium chloride, CTAC, has been studied in dilute aqueous solution using differential scanning calorimetry, DSC, isothermal titration calorimetry. length PPO block was same all (68−69 PO units), lengths PEO groups varied from 5, 20 97 EO units. are denoted L121, P123, F127 order increasing size. In P123...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of Thermodynamic and Kinetic Parameters from Isothermal Heat Conduction Microcalorimetry: Applications to Long-Term-Reaction StudiesRichard J. Willson, Anthony E. Beezer, John C. Mitchell, Watson LohCite this: Phys. Chem. 1995, 99, 18, 7108–7113Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1...
The interaction between the nonionic surfactant C12EO6 and poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer EO20PO68EO20 (P123) has been investigated by means of isothermal titration differential scanning calorimetry (DSC) as well static dynamic light scattering (SLS DLS). P123 self-assembles in water into spherical micelles at ambient temperatures. At raised temperatures, DSC data revealed a sphere-to-rod transition around 60 degrees C. interacts strongly...
Isothermal titration calorimetry is increasingly becoming a common tool for the investigation of surfactant association processes. This can be associated with development new, sensitive and easy-to-operate commercial equipment, allied advantage producing simultaneous information on main thermodynamic parameters process under investigation. However, significant fraction users are still unfamiliar many aspects related use these calorimetric techniques. review intends to discuss design...
The spontaneous formation of a Janus polymer shell is clearly demonstrated by electron tomography and NOESY-NMR.