Giuseppe Storti

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Storti

First Name

Giuseppe

ORCID

0000-0002-9140-2456

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Publications 1 - 10 of 23

Equilibrium Theory-Based Assessment of Dual-Reflux Pressure Swing Adsorption Cycles That Utilize Light Gas for Pressure Swing
Bhatt, Tushar S.; Storti, Giuseppe; Denayer, Joeri F.M.; et al. (2019)
Industrial & Engineering Chemistry Research
Self-association dynamics and morphology of short polymeric PBA-b/co-PAA surfactants
Lamprou, Alexandros; Xie, Delong; Storti, Giuseppe; et al. (2014)
Colloid & polymer science
The self-association characteristics of very short and well-defined poly(butyl acrylate)-b-poly(acrylic acid) (PBA-b-PAA) block copolymers in water have been studied. The diblocks are asymmetric with the PBA block longer than the PAA block, giving rise to hollow sphere morphology. This is affirmed by experimental data and theoretical evaluations of the hydrophilic and hydrophobic domain sizes, as well as a value close to 1 for the ratio of the hydrodynamic to the gyration radius of the micelles. Besides, the untypically short PBA blocks (polymerization number around 15) render the micelles dynamic. Indications in support include among others the following: the CMC (critical micellar concentration) values depend, together with the aggregation numbers and the micellar sizes, on the block lengths, as predicted by theory; above the CMC their sizes are concentration-independent, while the micelles disappear below CMC. A comparison was also made with a random PBA-co-PAA copolymer of similar length, which self-associates at an apparent CMC 1 order of magnitude larger than those of the block copolymers, but the size of the formed micelles depends on the concentration.
Maltodextrin as stabilizer for emulsion polymerization: Adsorption and grafting behavior
Ferrari, Raffaele; Storti, Giuseppe; Morbidelli, Massimo (2020)
Journal of Polymer Science
Self-Diffusion of Small Molecules into Rubbery Polymers: A Lattice Free-Volume Theory
Costa, Liborio I.; Storti, Giuseppe (2010)
Journal of Polymer Science. Part B, Polymer Physics
n the framework of the free-volume (FV) theory, a new equation was derived for the evaluation of self-diffusion coefficients of small molecules in polymers above the mixture glass transition temperature. The derivation of the equation turned out to be straightforward once the equivalence between the free volume and the unoccupied volume given by thermodynamic lattice theories is assumed. A parameter evaluation scheme is proposed, which is substantially simpler compared with the conventional Vrentas–Duda approach, even without losing generality. The key assumption is discussed, and its consistency is verified from a numerical viewpoint. A comparison with experimental solvent self-diffusion coefficients for several solvent/polymer binary systems confirmed that the proposed theory presents good correlative ability over wide temperature and composition ranges. Moreover, the introduced thermodynamic foundation allows one to easily include the pressure effect too. In the frame of the proposed lattice free volume theory, the sizes of the polymer jumping units decrease with temperature and increase with pressure. Such behavior converges with theoretical expectations and opens the way for a predictive FV theory.
Optimal Design Procedure of Dual-Reflux Pressure Swing Adsorption Units for Nonlinear Separations
Rossi, Ester; Storti, Giuseppe; Rota, Renato (2019)
Industrial & Engineering Chemistry Research
Studies on the interactions of CO2 with biodegradable poly(dl-lactic acid) and poly(lactic acid-co-glycolic acid) copolymers using high pressure ATR-IR and high pressure rheology
Tai, Hongyun; Upton, Clare E.; White, Lisa J.; et al. (2010)
Polymer
Amorphous poly(dl-lactic acid) (PdlLA) and poly(lactic acid-co-glycolic acid) (PLGA) polymers have been used to fabricate porous scaffolds for tissue engineering applications via a supercritical foaming technique. The chemical composition of the polymers and the morphology (pore size, porosity and interconnectivity) of the scaffolds are crucial because they influence cell filtration, migration, nutrient exchange, degradation and drug release rate. To control the morphology of supercritical foamed scaffolds, it is essential to study the interactions of polymers with CO2 and the consequent solubility of CO2 in the polymers, as well as the viscosity of the plasticized polymers. In this paper, we are showing for the first time that well known and useful biodegradable polymers can be plasticized easily using high pressure CO2 and that we can monitor this process easily via a high pressure attenuated total reflection Fourier transform infrared (ATR-IR) and rheology. High pressure ATR-IR has been developed to investigate the interactions of CO2 with PdlLA and PLGA polymers with the glycolic acid (GA) content in the copolymers as 15, 25, 35 and 50% respectively. Shifts and intensity changes of IR absorption bands of the polymers in the carbonyl region (∼1750 cm−1) are indicative of the interaction on a qualitative level. A high pressure parallel plate rheometer has also been developed for the shear viscosity measurements of the CO2-plastisized polymers at a temperature below their glass transition temperatures. The results demonstrate that the viscosities of the CO2-plasticized polymers at 35 °C and 100 bar were comparable to the values for the polymer melts at 140 °C, demonstrating a significant process advantage through use of scCO2. The data from the high pressure rheology and high pressure ATR-IR, combined with the sorption and swelling studies reported previously, demonstrate that the interaction and the solubility of CO2 in PLGA copolymers is related to the glycolic acid content. As the glycolic acid ratio increases the interaction and consequent solubility of CO2 decreases. The potential applications of this study are very broad, from tissue engineering and drug delivery to much broader applications with other polymers in areas that may range from composites and polymer synthesis through to injection moulding.
Mechanical phase inversion of Pickering emulsions via metastable wetting of rough colloids
Zanini, Michele; Cingolani, Alberto; Hsu, Chiao-Peng; et al. (2019)
Soft Matter
The possibility to invert emulsions from oil-in-water to water-in-oil (or vice versa) in a closed system, i.e. without any formulation change, remains an open fundamental challenge with many opportunities for industrial applications. Here, we propose a mechanism that exploits particle surface roughness to induce metastable wetting and obtain mechanically-responsive Pickering emulsions. We postulate that the phase inversion is driven by an in situ switch of the particle wettability from metastable positions at the interface following the input of controlled mechanical energy. Oil-in-water emulsions can be prepared at low energy using mildly hydrophobic rough colloids, which are dispersed in water and weakly pinned at the interface, and switched to water-in-oil emulsions by a second emulsification at higher energy, which triggers the relaxation of the particle contact angle. The same principle is demonstrated for the complementary emulsions using mildly hydrophilic colloids initially dispersed in oil. Our experiments and simulations support that the delicate interplay between particle surface design during synthesis and the energy of the emulsification process can encode a kinetic pathway for the phase inversion. Both organic and inorganic nanoparticles can be used, allowing for the future implementation of our strategy in a broad range of smart industrial formulations.
Preparation of perfusive chromatographic materials via shear-induced reactive gelation
Cingolani, Alberto; Baur, Daniel; Caimi, Stefano; et al. (2018)
Journal of Chromatography A
Coal characterization for ECBM recovery: Gas sorption under dry and humid conditions, and its effect on displacement dynamics
Pini, Ronny; Marx, Dorian; Burlini, Luigi; et al. (2011)
Energy Procedia ~ 10th International Conference on Greenhouse Gas Control Technologies
Enhanced Coal Bed Methane (ECBM) recovery is a technique under investigation as a possible approach to the geological storage of CO2 in a carbon dioxide capture and storage (CCS) system. This technology allows enhancing the recovery of coal bed methane by injecting CO2 in the coal seam at supercritical conditions. Through an in situ sorption/desorption process the displaced methane is produced and the adsorbed CO2 is permanently stored. In the case of coal, the uptake of CO2, CH4 and N2 is a combination of adsorption on its surface and penetration (absorption) into its solid matrix, the latter resulting in coal’s swelling. These two processes act simultaneously, making the coal a challenging material to be studied, in particular with respect to the understanding of the fundamental aspects of gas adsorption. High pressure sorption data of CO2, CH4 and N2 on a coal sample from Australia are presented; the interpretation of the experimental data takes into account the dual nature of the sorption process and a Langmuir-like model is applied to the sorption data, by fitting the isotherm parameters to the experimental values. The results confirm that this equation is a valuable option to describe gas sorption on coal. Moreover, a one-dimensional mathematical model previously derived is used to perform numerical simulations on the performance of ECBM recovery in coal beds. Important insights are obtained regarding the gas flow dynamics during displacement and the effects of gas sorption on the ECBM operation.
Modeling dual reflux-pressure swing adsorption processes: Numerical solution based on the finite volume method
Rossi, Ester; Paloni, Matteo; Storti, Giuseppe; et al. (2019)
Chemical Engineering Science

Publications 1 - 10 of 23

Giuseppe Storti

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