0000000000457994
AUTHOR
Rosario De Lisi
Thermodynamic evidences for the formation of tri-block copolymer/surfactant nanostructures in water
Adsorption of a dye on clay and sand. Use of cyclodextrins as solubility-enhancement agents.
Abstract Laboratory-scale studies were aimed at elucidating the physico-chemical aspects on the removal process of crystal violet (CV) from waters and solid substrates. The laponite clay (RD) and sand were chosen for the double aim at investigating them as CV adsorbents for water treatment and as substrates which mime the soil components. Sand is very effective in removing CV from waters. The cyclodextrins (CDs) were exploited as solubility-enhancement agents to remove CV from the solid substrates. They are powerful solvent media because they extract the CV from sand forming water-soluble CV/CD inclusion complexes and do not show affinity for sand. Optimum performance was shown by the modif…
Thermodynamics of cyclodextrin-surfactant interactions. Volume Enthalpy and Heat Capacity Studies
Cyclodextrins as Solubility-Enhancement Agents for Contaminant Removal from Solid Substrates
Solubilizzazione di composti organici in micelle di copolimeri termo- e pH-sensibili
A specific operative protocol set up during the restoration of the Grammichele's slate slab
Il cammino del sole, gli spazi del giorno. Piano urbanistico del comune di Grammichele (CT) su lastra di ardesia dipinta
Aggregation of triblock copolymers in water induced by chlorinated oils
Gelation Dynamics of Laponite Hydrogels in Presence of Tri-block Copolymers and their Homopolymers: a Rheological and Dynamic Light Scattering Study
Incorporation of Nitropropane in Copolymer and Copolymer-Surfactant Aggregates. A Volume, Viscosity and Differential Scanning Calorimetry Study
Aggregation in aqueous media of tri-block copolymers tuned by the molecular selectivity of cyclodextrins
The water + cyclodextrin + poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) mixtures have been investigated to explore the temperature effect on the aggregation of the copolymer in the presence of cyclodextrins (CDs). The CDs with different cavity sizes were chosen because they may include either the hydrophilic poly(ethylene oxides) block or both kinds of blocks. The differential scanning calorimetry and viscosity experiments straightforwardly evidenced that the critical micellar temperature is shifted to larger values by adding a CD which is able to include the middle poly(propylene oxide) block while it is not influenced by the presence of CD which is selective to the poly…
Temperature and Solvent effect on the Cyclodextrin-Triblock Copolymers Pseudo-Polyrotaxanes Formation
Study for Designing Novel Gels to Clean an Aged Varnish on a Stone Painted Work of Art: DSC, FT-IR and Viscosity Analysis
A thermodynamic study to evidence interactions between tri-block copolymers and conventional surfactant
Thermodynamic and Structural Characterization of Copolymer Functionalized Nanosized Particles
Aqueous Block Copolymer-Surfactant Aggregates: Tools to Solubilize Organic Compounds. Thermodynamic and Structural Investigations
Group contributions to the infinite dilution partial molar volumes of alkanes, alcohols, and glycols in polar organic solvents
Densities of binary mixtures of polar organic solvents with alcohols were measured at 25‡C. The solvents studied were N,N-dimethylformamide, dimethylsulfoxide, and formamide while alcohols were butanol, pentanol, hexanol, and 1,4-butanediol. Density measurements of hydrocarbons (from pentane to dodecane and some heptane isomers) + N,N-dimethylformamide were also performed. From these data the apparent molar volumes of alcohols and hydrocarbons as functions of concentration were calculated. The standard partial molar volumes were obtained by extrapolation to infinite dilution and are discussed in terms of group contributions.
Interactions of native and modified cyclodextrins with some biologically active pyridine derivatives.
Phenol in Aqueous Mixtures Composed by Pluronic Copolymer and Laponite Clay. A Calorimetric and Spectrophotometric Study
Aggregation of Poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) Copolymers in Water at Some Temperatures. Volumetric and viscosimetric studies
Calorimetric, FT-IR and Viscosity Investigations to Designnovel Cleaning Agents for Removing Linseed Oil Based Varnish
A Volumetric and Calorimetric Study on Interactions Occurring Between Cyclodextrins and Nicotinic Acid in Aqueous Solution.
Thermodynamic properties of alcohols in a micellar phase. Binding constants and partial molar volumes of pentanol in sodium dodecylsulfate micelles at 15, 25, and 35°C
Densities of the ternary system water-sodium dodecylsulfate (NaDS)-pentanol and of the binary systems butanol-octane and pentanol-octane were measured at 15, 25, and 35 °C. The apparent molar volume of pentanol in the ternary system was analyzed using a mass-action model for the alcohol distribution in micellar solutions. The partial molar volume of alcohol bound to the micelles and the ratio between the binding constant and the aggregation number of the surfactant are calculated. The partial molar volume binding constant, is discussed in terms of solubilization sites of the alcohol in the micelles whereas the binding constant is compared with that derived from the Nernstian partition const…
Kinetics of Gelation of Aqueous Laponite Dispersions in the Presence of Tri-blockCopolymers and their Homopolymers. Rheological and Dynamic Light Scattering Studies
Cyclodextrin-Macromolecule Interactions. Volumetric and Calorimetric Investigations
A Calorimetric and Viscosimetric Study for the Characterization of Pectin Hydrogels. Application in the field of Cultural Heritage
Laponite Clay Dispersed in Polymeric Matrices. DSC and Structural Studies
Nanostructured systems functional to the recover and conservation of cultural heritage
Thermodynamics of adsorption of low and high molecular weight surfactants onto polystyrene nanoparticles
Copolymers sensitive to temperature and pH in water and in water+oil mixtures: A DSC, ITC and volumetric study
Block copolymer micelles are receiving an increasing interest because of the variety of structures and the possibilities to tune them by changing external and internal parameters achieving the desired properties for a specific purpose. We have investigated the acid/base behavior, self-assembling and solubilization ability towards polar oils of star-like copolymers named Tetronics. They are composed of branched four-arms each one consisting of two blocks made of EO and PO units linked to the diethylenediamine group, which confers pH response ability. The copolymers T1107 and T90R4 were studied with a sequential and reverse architecture. The thermodynamics of the acid/base equilibrium was stu…
Solubilization of Nitropropane in Copolymer and Surfactant-Copolymer Aggregates
Aggregates of Triblock Copolymers and Triblock Copolymer-Surfactant Functional to the Solubilization of Chlorinated Oils. A Thermodynamic Study
Thermodynamic Studies to Evidence Block Copolymer-Surfactant Interactions
Gels Based on Pectin for Cultural Heritage Applications
Thermodynamics of Surfactant, Block Copolymer and Their Mixtures in Water: The Role of the Isothermal Calorimetry
The thermodynamics of conventional surfactants, block copolymers and their mixtures in water was described to the light of the enthalpy function. The two methodologies, i.e. the van't Hoff approach and the isothermal calorimetry, used to determine the enthalpy of micellization of pure surfactants and block copolymers were described. The van't Hoff method was critically discussed. The aqueous copolymer+surfactant mixtures were analyzed by means of the isothermal titration calorimetry and the enthalpy of transfer of the copolymer from the water to the aqueous surfactant solutions. Thermodynamic models were presented to show the procedure to extract straightforward molecular insights from the …
Solubilization of oils in aqueous solution of star-like block copolymer with thermo- and pH-sensitive features
Solid/liquid interface. Interaction between polystyrene nanoparticles and amphiphilic additives
Thermodynamics of binary mixtures: Volumes, heat capacities, and dilution enthalpies for then-pentanol+2-methyl-2-butanol system
The densities, heat capacities, and dilution enthalpies ofn-pentanol+2-methyl-2-butanol mixtures have been measured, in many cases as a function of temperature, over the complete mole fraction range. Excesses thermodynamic properties, apparent and partial molar heat capacities, volumes and expansibilities were derived. The concentration and temperature dependences of these functions are discussed in terms of the variations of the structure of the system caused by the participation of the two alcohol molecules (with quite different steric hindrance of the alkyl chain around the-OH group) in the dynamic intermolecular association process through hydrogen bonding.
A physico-chemical study to evidence nano-structured systems formed by triblock copolymers
A Thermodynamic Model for the Properties of Transfer of Non-ionic Copolymers from water to the aqueous Surfactant Solution. Effect of the Copolymer Molecular Weight and the Surfactant Hydrophobicity
Nanostructured Gels for the Conservation of a Slate Painted Work of Art
Apparent molar volumes of 1-pentanol in water fromT=298 K toT=413 K atp=0.1 MPa andp=19 MPa
Abstract Densities of 1-pentanol aqueous solutions were measured by using a vibrating tube densimeter especially designed and equipped to perform accurate measurements from ambient conditions up toT=423 K andp=80 MPa. The densimeter was tested by measuring densities of NaCl (aq). A comparison with the most reliable literature data showed very good agreement with differences lower than (0.03 and 0.1) kg·m−3for molalities below and above 0.5 mol·kg−1, respectively. From the density measurements, the apparent molar volumes of 1-pentanol in water,Vφwere determined as a function of molalitymat temperatures fromT=298 K toT=413 K atp=0.1 MPa andp=19 MPa. At a given temperature and pressure, and pa…
Solubilisation of chlorinated oils in triblock copolymers and triblock copolymer-surfactant mixed aggregates
Thermodynamic Characterization of Interactions of Cyclodextrins with Nicotinic Acid
The restoration of a painted stone work of art: study on altered protective layer
The Urban Map of the Grammichele City (Ct): Novel Gels Used for the Restoration of a Painted Stone Work Of Art
Triblock Copolymers/Laponite Nanostructures in Aqueous Media and their Solubilization Capability. Thermodynamic and Structural Study
Calorimetric and Dynamic Light Scattering Characterization of Surfactant-Nanoparticle Interactions
Conductance of potassium halides near the temperature of maximum density of water
The conductances of dilute aqueous solutions of KCl, KBr, and KI have been measured over the temperature range 2 to 8°C and have been analyzed by the Fuoss-Hsia equation. The ionic Walden products at infinite dilution have been discussed in terms of local viscosity. The temperature dependence of these products suggest that near the temperature of maximum density of water, the structure-breaking ability of these ions changes in a regular way.
A Calorimetric Investigation to Study the Effect of Polymers onto the Behaviour of Aqueous Laponite Concentrated Dispersions
Solubilization of an Organic Compound in Aqueous Solutions of Unimeric Block Copolymers and their Mixtures with Monomeric Surfactant. Volume, SANS, Surface Tension, DSC, Viscosity and Fluorescence Spectroscopy Studies
Volume and heat capacity studies to evidence interactions between cyclodextrins and nicotinic acid in water
Density and heat capacity of the water+cyclodextrin (CD), water+nicotinic acid (NA) and water+CD+NA mixtures were determined at 298.15 K. CDs with different cavity size and alkylation were selected. From the experimental data the apparent molar properties were calculated. Assuming the formation of inclusion complexes of 1:1 stoichiometry, these properties were modeled and provided the stability constants of CD/NA inclusion complexes and the corresponding property change. The binding of NA with the smallest sized alpha-cyclodextrin (alpha-CD) generates more stable complexes accompanied by the lower volume and the heat capacity changes. These results are in agreement with earlier proposed bin…