Marcos A. Villetti
Universidade Federal de Santa Maria
Analytical chemistrySmall-angle X-ray scatteringNuclear chemistryIonDynamic light scatteringIonic liquidOrganic chemistryInorganic chemistryAqueous solutionChemistryPolymer chemistryMaterials scienceAlkylMoleculeChemical engineeringPolymerPulmonary surfactantThermal stabilityThermogravimetric analysisCrystallography
71Publications
17H-index
779Citations
Publications 73
Newest
#2Adryana Clementino (University of Parma)H-Index: 2
Tamoxifen citrate (TMC), a non-steroidal antiestrogen drug used for the treatment of breast cancer, was loaded in a block copolymer of maltoheptaose-b-polystyrene (MH-b-PS) nanoparticles, a potential drug delivery system to optimize oral chemotherapy. The nanoparticles were obtained from self-assembly of MH-b-PS using the standard and reverse nanoprecipitation methods. The MH-b-PS@TMC nanoparticles were characterized by their physicochemical properties, morphology, drug loading and encapsulation...
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#1Patrícia Regina Ebani (UFSM: Universidade Federal de Santa Maria)H-Index: 3
#2Luiza Stefanello (UFSM: Universidade Federal de Santa Maria)H-Index: 1
Last. Marcos A. Villetti (UFSM: Universidade Federal de Santa Maria)H-Index: 17
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Abstract null null New nanocarriers have contributed to develop the so-called third-generation photosensitizers for use in the photodynamic therapy (PDT). In this paper, nanoparticles based on carboxymethyl chitosan (CMC) and a monocationic ionic liquid imidazolium-based (IL) (1-dodecyl-3-methylimidazolium bromide, C12MIMBr), loaded with photosensitizer zinc phthalocyanine (ZnPc) was developed for application in PDT. The CMC/IL@ZnPc nanoparticles were characterized by their physicochemical prope...
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Mango industry processing disposes 40-60% of this fruit as residues, such as peels and kernels. The exploration of bioproducts from these industrial rejects can reduce environmental impact besides of producing high value-added materials. In this scenario, carboxymethyl starch nanoparticles were produced from mango (Mangifera indica L.) kernel starch. These nanoparticles were then decorated with thermoresponsive chains of the amino terminated poly(N-isopropylacrylamide) (PNIPAM-NH2), with the int...
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#1Caroline R. BenderH-Index: 12
#2Filipa A. Vicente (University of Aveiro)H-Index: 11
Last. Pedro J. Carvalho (University of Aveiro)H-Index: 37
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A cloud point evaluation was performed for the nonionic surfactant Tergitol 15-S-7 in aqueous solutions of McIlvaine buffer (pH 7.0). Cloud point temperatures of the selected nonionic surfactant were studied in relation to the effect that the addition of dicationic ionic liquids (ILs) had on the systems. The dicationic ILs with different alkyl spacer lengths were derived from 1, n-bis(3-methylimidazolium-1-yl)alkane bromide ([BisAlk(MIM)2][2Br]) — in which Alk = But, Hex, Oct, and Dec. The dicat...
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#1Ayrton F. Martins (UFSM: Universidade Federal de Santa Maria)H-Index: 23
#2Marcos A. Villetti (UFSM: Universidade Federal de Santa Maria)H-Index: 17
Last. Magale Karine Diel Rambo (UFT: Federal University of Tocantins)H-Index: 7
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Carbon-like materials from pyrolysis (<500 °C) of agricultural leftovers (rice husks, eucalyptus sawdust and peach stones) were submitted to steam activation and the expected adsorbent properties evaluated by means of a chemical method (methylene blue) and physically characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and surface area (BET). Batch experiments were carried out to check the pH effect on the adsorption of methylene blue, by evaluating the respectiv...
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#1Jean C. B. Vieira (UFSM: Universidade Federal de Santa Maria)H-Index: 3
#2Marcos A. Villetti (UFSM: Universidade Federal de Santa Maria)H-Index: 17
Last. Clarissa P. Frizzo (UFSM: Universidade Federal de Santa Maria)H-Index: 21
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Abstract This work presents the synthesis, thermal stability, and decomposition mechanisms of the dicationic ionic liquids (DILs) [Bis(CnMIM)][CmCO2]2 (in which n = 4 and 10, and m = 3 and 6). Short-term thermal stability was determined using conventional thermogravimetric analysis, while long-term thermal stability was studied through the kinetic analysis of thermal decomposition, using isothermal and isoconversional methodologies to determine the kinetic triplet (activation energy[Ea], pre-exp...
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#3Marcos A. Villetti (UFSM: Universidade Federal de Santa Maria)H-Index: 17
#4Rafael da Silva Fernandes (UFRN: Federal University of Rio Grande do Norte)H-Index: 5
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Last. Rosangela C. BalabanH-Index: 1
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Last. Rosangela C. BalabanH-Index: 1
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#1Bruno L. Hennemann (UFSM: Universidade Federal de Santa Maria)H-Index: 3
#2Guilherme S. Moleta (UFSM: Universidade Federal de Santa Maria)H-Index: 1
Last. Clarissa P. Frizzo (UFSM: Universidade Federal de Santa Maria)H-Index: 21
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Abstract The aim of this work was to evaluate the influence of US on the properties of the fluconazole emulsions prepared using imidazolium-based ILs ([Cn C1im]Br). The effects of the preparation method (mechanical stirring or US), US amplitude, alkyl chain length (of [C12C1im]Br or [C16C1im]Br), and IL concentration on the physicochemical properties were evaluated. Properties such as droplet size, span index, morphology, viscosity encapsulation efficiency, and drug release profile were determin...
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