@article{Larsson2024,

title = {Elastic surrogate modeling of graphene nanoplatelet-reinforced epoxy using computational homogenization},

author = {Ragnar Larsson and Danilo J. Carastan and Matheus M. de Oliveira and Linnéa Selegård and Mario Martínez},

url = {https://www.sciencedirect.com/science/article/pii/S0266353824003312},

doi = {10.1016/j.compscitech.2024.110761},

issn = {0266-3538},

year  = {2024},

date = {2024-09-00},

urldate = {2024-09-00},

journal = {Composites Science and Technology},

volume = {256},

publisher = {Elsevier BV},

abstract = {2D nanoparticles, such as graphene or graphite nanoplatelets, are used as additives in polymer matrices to improve their stiffness and electrical conductivity. In this paper, a finite element-based model for homogenized macrolevel stiffness is developed to understand the increase in stiffness of the epoxy matrix induced by graphene nanoplatelets. The model uses image segmentation of regular SEM micrographs to account for the morphology of the graphene platelet network. Here, it is essential to include a fluctuation field in computational homogenization to describe microstructural relaxation. Platelets of the microstructure are modeled as embedded membranes, assuming perfect bonding to the polymer. To estimate the stiffness of the membrane, we used molecular dynamics simulations from a related paper on layered graphene platelets. A novel feature is the identified anisotropic and isotropic elastic surrogate models obtained by least-squares fits of homogenized microstructural responses. Surrogate models serve as a basis for the evaluation of the stiffness of the nanocomposites, and these models are validated through the Halpin–Tsai and Mori–Tanaka models. According to the experimental investigation, the results show that the samples exhibit an increase in stiffness of up to 10 % to 30 % for GNP contents ranging from 1 to 5 wt. %, respectively, obtained from the morphological properties and the weight fraction of the carbon filler.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{deOliveira2024,

title = {Hybrid Nanofiller-Enhanced Carbon Fiber-Reinforced Polymer Composites (CFRP) for Lightning Strike Protection (LSP)},

author = {Matheus Mendes de Oliveira and Linnea Runqvist and Thirza Poot and Kajsa Uvdal and Danilo J. Carastan and Linnea Selegård},

url = {https://pubs.acs.org/doi/full/10.1021/acsomega.4c03272},

doi = {10.1021/acsomega.4c03272},

issn = {2470-1343},

year  = {2024},

date = {2024-08-09},

urldate = {2024-08-09},

journal = {ACS Omega},

publisher = {American Chemical Society (ACS)},

abstract = {The aviation industry relies on lightweight carbon fiber-reinforced polymers (CFRP) for fuel efficiency, which necessitates lightning strike protection (LSP) and electromagnetic shielding due to their electrical insulating characteristics. Traditional metallic meshes used for LSP are heavy and corrosion-prone, prompting the exploration of alternatives. This research showcases CFRP nanocomposites with enhanced LSP properties through the incorporation of graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs). While the enhanced conductivity in the nanofilled epoxy matrix did not impact the overall conductivity of CFRP panels, a significant damage reduction was observed after simulated lightning strike tests. Similar approaches in the literature have also noted this discrepancy, but no attempts to reconcile it have been made. This work provides a framework to explain the damage reduction mechanism while accounting for the modest conductivity improvements in the nanoreinforced CFRPs. Additionally, a simple, nondestructive method to assess surface resin degradation after a lightning strike test is proposed, based on the fluorescence of diphenyl ketones. The discussion is supported by electrical conductivity measurements, damage pattern evaluation using the proposed UV-illumination method, ATR-FTIR, and scanning electron microscopy analysis pre- and postlightning strike simulation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Santos2024,

title = {Self-healing epoxy coatings via microencapsulation of aromatic diisocyanate in lignin stabilized Pickering emulsions},

author = {Amanda N.B. Santos and Júlia R. Gouveia and Guilherme E.S. Garcia and Renato A. Antunes and Demetrio J. dos Santos and Danilo J. Carastan},

url = {https://www.sciencedirect.com/science/article/pii/S294982282400073X},

doi = {10.1016/j.nxmate.2024.100176},

issn = {2949-8228},

year  = {2024},

date = {2024-04-00},

urldate = {2024-04-00},

journal = {Next Materials},

volume = {3},

publisher = {Elsevier BV},

abstract = {Isocyanate-filled microcapsules are gaining increased attention for their role in developing self-healing materials, thereby reducing maintenance costs and increasing polymer durability. Nevertheless, microencapsulating highly reactive -NCO groups remains a challenging task in the literature. Likewise, considerable efforts have been directed towards developing polymers from renewable and biobased sources, which could also be applied to microcapsule synthesis. In this work, lignin, an abundant biopolymer, was used as a solid stabilizer for oil-in-water (O/W) interfaces, enabling the encapsulation of highly reactive isocyanate. Hybrid polyurethane/polyurea microcapsules containing reactive methylenediphenyl diisocyanate (MDI) were obtained via optimized O/W Pickering emulsions using lignin for system stabilization. This optimized process facilitated shell formation via the reaction of diisocyanate with lignin and water, eliminating the need for additional chain extenders. Scanning electron microscopy revealed the formation of spherical and rough microcapsules, while infrared spectroscopy confirmed the presence of residual free -NCO groups, indicating effective encapsulation of MDI. Additionally, a core -NCO concentration of 11 wt% was confirmed by titration. The microcapsules were further assessed as components in self-healing epoxy coatings. Their incorporation resulted in the retardation of corrosion on a low carbon steel panel after 72 h of submersion in a saline solution. Electrochemical impedance spectroscopy (EIS) confirmed a significant increase of approximated 620% in impedance modulus after 83 days of immersion in a 3.5 wt% NaCl solution, compared to the neat epoxy coating. These findings suggest a promising technological application of this material for the advancement of self-healing epoxy-based coatings and composites.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Santos2024b,

title = {Self-healing epoxy coatings via microencapsulation of aromatic diisocyanate in lignin stabilized Pickering emulsions},

author = {Amanda N.B. Santos and Júlia R. Gouveia and Guilherme E.S. Garcia and Renato A. Antunes and Demetrio Jackson dos Santos and Danilo J. Carastan},

url = {https://www.sciencedirect.com/science/article/pii/S294982282400073X},

doi = {10.1016/j.nxmate.2024.100176},

issn = {2949-8228},

year  = {2024},

date = {2024-04-00},

urldate = {2024-04-00},

journal = {Next Materials},

volume = {3},

publisher = {Elsevier BV},

abstract = {Isocyanate-filled microcapsules are gaining increased attention for their role in developing self-healing materials, thereby reducing maintenance costs and increasing polymer durability. Nevertheless, microencapsulating highly reactive -NCO groups remains a challenging task in the literature. Likewise, considerable efforts have been directed towards developing polymers from renewable and biobased sources, which could also be applied to microcapsule synthesis. In this work, lignin, an abundant biopolymer, was used as a solid stabilizer for oil-in-water (O/W) interfaces, enabling the encapsulation of highly reactive isocyanate. Hybrid polyurethane/polyurea microcapsules containing reactive methylenediphenyl diisocyanate (MDI) were obtained via optimized O/W Pickering emulsions using lignin for system stabilization. This optimized process facilitated shell formation via the reaction of diisocyanate with lignin and water, eliminating the need for additional chain extenders. Scanning electron microscopy revealed the formation of spherical and rough microcapsules, while infrared spectroscopy confirmed the presence of residual free -NCO groups, indicating effective encapsulation of MDI. Additionally, a core -NCO concentration of 11 wt% was confirmed by titration. The microcapsules were further assessed as components in self-healing epoxy coatings. Their incorporation resulted in the retardation of corrosion on a low carbon steel panel after 72 h of submersion in a saline solution. Electrochemical impedance spectroscopy (EIS) confirmed a significant increase of approximated 620% in impedance modulus after 83 days of immersion in a 3.5 wt% NaCl solution, compared to the neat epoxy coating. These findings suggest a promising technological application of this material for the advancement of self-healing epoxy-based coatings and composites.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{deSousaJúnior2023,

title = {Viscoelastic behavior of pressure-sensitive adhesive based on block copolymer and kraft lignin},

author = {Rogerio R. de Sousa Júnior and Guilherme E.S. Garcia and Demetrio J. dos Santos and Danilo J. Carastan},

url = {https://www.tandfonline.com/doi/abs/10.1080/00218464.2023.2201443},

doi = {10.1080/00218464.2023.2201443},

issn = {1545-5823},

year  = {2024},

date = {2024-01-25},

urldate = {2024-01-25},

journal = {The Journal of Adhesion},

volume = {100},

number = {2},

pages = {139--155},

publisher = {Informa UK Limited},

abstract = {Practical adhesion of pressure-sensitive adhesives (PSAs) is strongly dependent on their viscoelastic properties. The use of biobased materials emerged as an effective approach to modify the rheological, mechanical, and adhesive properties of PSAs. The biopolymer kraft lignin (KL), a by-product of pulp and paper manufacturing, appeared as a potential candidate for modifying the adhesive behavior of PSAs. In this study, we developed a block copolymer-based PSA by incorporating a hydrocarbon resin (HCR) and kraft lignin into the block copolymer polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS). “Viscoelastic windows”, which describe the potential application of a PSA based on its viscoelastic behavior, were constructed for PSAs with the addition of KL. These results demonstrate the potential for application as a high-shear PSA due to the increased energy dissipation of the samples. Practical adhesion was evaluated using probe tack tests and lap shear strength measurements, which effectively demonstrated an increase in the cohesive strength of the PSA with an optimized concentration of 5 wt% KL.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{deSousaJúnior2023c,

title = {Viscoelastic behavior of pressure-sensitive adhesive based on block copolymer and kraft lignin},

author = {Rogerio R. de Sousa Júnior and Guilherme E.S. Garcia and Demetrio Jackson dos Santos and Danilo J. Carastan},

url = {https://www.tandfonline.com/doi/abs/10.1080/00218464.2023.2201443},

doi = {10.1080/00218464.2023.2201443},

issn = {1545-5823},

year  = {2024},

date = {2024-01-25},

urldate = {2024-01-25},

journal = {The Journal of Adhesion},

volume = {100},

number = {2},

pages = {139--155},

publisher = {Informa UK Limited},

abstract = {Practical adhesion of pressure-sensitive adhesives (PSAs) is strongly dependent on their viscoelastic properties. The use of biobased materials emerged as an effective approach to modify the rheological, mechanical, and adhesive properties of PSAs. The biopolymer kraft lignin (KL), a by-product of pulp and paper manufacturing, appeared as a potential candidate for modifying the adhesive behavior of PSAs. In this study, we developed a block copolymer-based PSA by incorporating a hydrocarbon resin (HCR) and kraft lignin into the block copolymer polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS). “Viscoelastic windows”, which describe the potential application of a PSA based on its viscoelastic behavior, were constructed for PSAs with the addition of KL. These results demonstrate the potential for application as a high-shear PSA due to the increased energy dissipation of the samples. Practical adhesion was evaluated using probe tack tests and lap shear strength measurements, which effectively demonstrated an increase in the cohesive strength of the PSA with an optimized concentration of 5 wt% KL.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{deSousa2023b,

title = {High-Performance Block-Copolymer-Based Dielectric Elastomers with Enhanced Mechanical Properties},

author = {Rogerio R. de Sousa and Joana B. Sacramento and Laura C. E. da Silva and Daniela Becker and Suel E. Vidotti and Danilo J. Carastan},

url = {https://pubs.acs.org/doi/abs/10.1021/acsapm.3c01880},

doi = {10.1021/acsapm.3c01880},

issn = {2637-6105},

year  = {2023},

date = {2023-11-10},

urldate = {2023-11-10},

journal = {ACS Appl. Polym. Mater.},

volume = {5},

number = {11},

pages = {9505--9514},

publisher = {American Chemical Society (ACS)},

abstract = {Thermoplastic elastomer gels have been highlighted in recent years due to their highly tunable properties, becoming interesting electroactive polymers for the fabrication of dielectric elastomer actuators. These materials are obtained by adding high concentrations of an organic solvent, such as mineral oil, to a block copolymer thermoplastic elastomer. The organic solvent is selective to one of the blocks and, therefore, significantly improves the elastomer flexibility. However, high solvent concentrations tend to reduce the mechanical stability of these materials, restricting future applications. In this work, we aimed to improve the strength and elongation of polystyrene-b-poly(ethylene-butylene)-b-polystyrene (SEBS) block copolymer gels by partially substituting mineral oil for a hydrogenated hydrocarbon resin, which has partial miscibility with the rubbery central block. The addition of the resin led to a significant increase in tensile strength and elongation at break (1000 and 1300%, respectively), compared to the thermoplastic elastomer gels containing solely mineral oil and without a significant increase in elastic modulus. The resulting gels show promise for electroactive applications, exhibiting a remarkable mechanical response to an electrical stimulus. The materials also demonstrate large actuation strains under relatively low electric fields, showing superior performance compared to other systems in the literature.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{deSousa2023,

title = {Electrical Conductivity and In Situ SAXS Probing of Block Copolymer Nanocomposites Under Mechanical Stretching},

author = {Rogerio R. de Sousa and Daniel A. Heinze and Joana B. Sacramento and Alexandre J. C. Lanfredi and Danilo J. Carastan},

url = {https://pubs.acs.org/doi/abs/10.1021/acsami.3c03573},

doi = {10.1021/acsami.3c03573},

issn = {1944-8252},

year  = {2023},

date = {2023-06-07},

urldate = {2023-06-07},

journal = {ACS Appl. Mater. Interfaces},

volume = {15},

number = {22},

pages = {27156--27165},

publisher = {American Chemical Society (ACS)},

abstract = {Elastomers based on block copolymers can self-organize into ordered nanoscale structures, making them attractive for use as flexible conductive nanocomposites. Understanding how ordered structures impact electrical properties is essential for practical applications. This study investigated the morphological evolution of flexible conductive elastomers based on polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS) block copolymers with aligned single- or multi-wall carbon nanotubes (SWCNTs or MWCNTs) and their electrical conductivity under large deformations. Oriented nanocomposites were obtained through injection molding and characterized using two different setups: tensile testing monitored by in situ small-angle X-ray scattering (SAXS) and tensile testing with simultaneous electrical conductivity measurements. Our findings demonstrate that structural orientation significantly influences electrical conductivity, with higher conductivity in the longitudinal direction due to the preferred orientation of carbon nanotubes. Tensile testing demonstrated that carbon nanotubes accelerate the process of realignment of the ordered structure. As a consequence, higher deformations reduced the conductivity of samples with longitudinal alignment due to the disruption of percolation contacts between nanotubes, while in samples with a transverse alignment the process promoted the formation of a new conductive network, increasing electrical conductivity.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{daSilva2023,

title = {PVC containing silver nanoparticles with antimicrobial properties effective against SARS-CoV-2},

author = {Daniel J. da Silva and Guilherme B. Gramcianinov and Pamela Z. Jorge and Vanessa B. Malaquias and Augusto A. Mori and Mário H. Hirata and Sergio A. M. Lopes and Luciano A. Bueno and Mathilde Champeau and Danilo J. Carastan},

url = {https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1083399/full},

doi = {10.3389/fchem.2023.1083399},

issn = {2296-2646},

year  = {2023},

date = {2023-03-13},

urldate = {2023-03-13},

journal = {Front. Chem.},

volume = {11},

publisher = {Frontiers Media SA},

abstract = {Poly (vinyl chloride) (PVC) is commonly used to manufacture biomedical devices and hospital components, but it does not present antimicrobial activity enough to prevent biofouling. With the emergence of new microorganisms and viruses, such as Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) that was responsible for the global pandemic caused by Coronavirus Disease 2019 (COVID-19), it is evident the importance of the development of self-disinfectant PVC for hospital environments and medical clinics where infected people remain for a long time. In this contribution, PVC nanocomposites with silver nanoparticles (AgNPs) were prepared in the molten state. AgNPs are well-known as antimicrobial agents suitable for designing antimicrobial polymer nanocomposites. Adding 0.1 to 0.5 wt% AgNPs significantly reduced Young’s modulus and ultimate tensile strength of PVC due to the emergence of microstructural defects in the PVC/AgNP nanocomposites, but the impact strength did not change significantly. Furthermore, nanocomposites have a higher yellowness index (YI) and lower optical bandgap values than PVC. The PVC/AgNP nanocomposites present virucidal activity against SARS-CoV-2 (B.1.1.28 strain) within 48 h when the AgNP content is at least 0.3 wt%, suitable for manufacturing furniture and hospital equipment with self-disinfectant capacity to avoid secondary routes of COVID-19 contagion.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{daSilva2023h,

title = {PVC containing silver nanoparticles with antimicrobial properties effective against SARS-CoV-2},

author = {Daniel J. da Silva and Guilherme B. Gramcianinov and Pamela Z. Jorge and Vanessa B. Malaquias and Augusto A. Mori and Mário H. Hirata and Sergio A. M. Lopes and Luciano A. Bueno and Mathilde Champeau and Danilo J. Carastan},

url = {https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1083399/full},

doi = {10.3389/fchem.2023.1083399},

issn = {2296-2646},

year  = {2023},

date = {2023-03-13},

urldate = {2023-03-13},

journal = {Front. Chem.},

volume = {11},

publisher = {Frontiers Media SA},

abstract = {Poly (vinyl chloride) (PVC) is commonly used to manufacture biomedical devices and hospital components, but it does not present antimicrobial activity enough to prevent biofouling. With the emergence of new microorganisms and viruses, such as Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) that was responsible for the global pandemic caused by Coronavirus Disease 2019 (COVID-19), it is evident the importance of the development of self-disinfectant PVC for hospital environments and medical clinics where infected people remain for a long time. In this contribution, PVC nanocomposites with silver nanoparticles (AgNPs) were prepared in the molten state. AgNPs are well-known as antimicrobial agents suitable for designing antimicrobial polymer nanocomposites. Adding 0.1 to 0.5 wt% AgNPs significantly reduced Young’s modulus and ultimate tensile strength of PVC due to the emergence of microstructural defects in the PVC/AgNP nanocomposites, but the impact strength did not change significantly. Furthermore, nanocomposites have a higher yellowness index (YI) and lower optical bandgap values than PVC. The PVC/AgNP nanocomposites present virucidal activity against SARS-CoV-2 (B.1.1.28 strain) within 48 h when the AgNP content is at least 0.3 wt%, suitable for manufacturing furniture and hospital equipment with self-disinfectant capacity to avoid secondary routes of COVID-19 contagion.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{daSilva2022,

title = {Designing antimicrobial polypropylene films with grape pomace extract for food packaging},

author = {Daniel J. da Silva and Matheus M. de Oliveira and Shu Hui Wang and Danilo J. Carastan and Derval S. Rosa},

url = {https://www.sciencedirect.com/science/article/abs/pii/S2214289422001211},

doi = {10.1016/j.fpsl.2022.100929},

issn = {2214-2894},

year  = {2022},

date = {2022-12-00},

urldate = {2022-12-00},

journal = {Food Packaging and Shelf Life},

volume = {34},

publisher = {Elsevier BV},

abstract = {Grape pomace (mixture of skins and seeds) is a residual by-product of the winemaking process, rich in polyphenolic compounds that have antioxidant and antimicrobial properties and can be recycled to manufacture fruit extracts to be used in new technological products. The use of non-toxic substances is exciting for developing packagings that are in direct contact with food, as components present in the polymer might migrate to the food. Moreover, the gradual release of these non-toxic bioactive components confers long-term antimicrobial activity to these PP films enriched with grape pomace extract. In addition, the use of raw materials from natural and renewable origins to manufacture antimicrobial packaging contributes to a more sustainable and eco-friendly industrial production and to mitigate environmental impacts. In this research, bactericidal isotactic polypropylene (PP) was developed using grape pomace extract as an antimicrobial additive and presents low water vapor permeability and antimicrobial activity against Gram-negative (Escherichia coli) and Gram-positive (Bacillus subtilis) bacteria, showing potential to function as an active and safer polymeric food packaging.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{daSilva2022c,

title = {Designing antimicrobial polypropylene films with grape pomace extract for food packaging},

author = {Daniel J. da Silva and Matheus M. de Oliveira and Shu Hui Wang and Danilo J. Carastan and Derval S. Rosa},

url = {https://www.sciencedirect.com/science/article/abs/pii/S2214289422001211},

doi = {10.1016/j.fpsl.2022.100929},

issn = {2214-2894},

year  = {2022},

date = {2022-12-00},

urldate = {2022-12-00},

journal = {Food Packaging and Shelf Life},

volume = {34},

publisher = {Elsevier BV},

abstract = {Grape pomace (mixture of skins and seeds) is a residual by-product of the winemaking process, rich in polyphenolic compounds that have antioxidant and antimicrobial properties and can be recycled to manufacture fruit extracts to be used in new technological products. The use of non-toxic substances is exciting for developing packagings that are in direct contact with food, as components present in the polymer might migrate to the food. Moreover, the gradual release of these non-toxic bioactive components confers long-term antimicrobial activity to these PP films enriched with grape pomace extract. In addition, the use of raw materials from natural and renewable origins to manufacture antimicrobial packaging contributes to a more sustainable and eco-friendly industrial production and to mitigate environmental impacts. In this research, bactericidal isotactic polypropylene (PP) was developed using grape pomace extract as an antimicrobial additive and presents low water vapor permeability and antimicrobial activity against Gram-negative (Escherichia coli) and Gram-positive (Bacillus subtilis) bacteria, showing potential to function as an active and safer polymeric food packaging.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{deOliveira2021,

title = {The Influence of Sonication Processing Conditions on Electrical and Mechanical Properties of Single and Hybrid Epoxy Nanocomposites Filled with Carbon Nanoparticles},

author = {Matheus Mendes de Oliveira and Sven Forsberg and Linnéa Selegård and Danilo J. Carastan},

url = {https://www.mdpi.com/2073-4360/13/23/4128},

doi = {10.3390/polym13234128},

issn = {2073-4360},

year  = {2021},

date = {2021-12-00},

urldate = {2021-12-00},

journal = {Polymers},

volume = {13},

number = {23},

publisher = {MDPI AG},

abstract = {Graphene nanoplatelets (GNP) and carbon nanotubes (CNT) are used to enhance electrical and mechanical properties of epoxy-based nanocomposites. Despite the evidence of synergetic effects in the hybrid GNP-CNT-epoxy system, there is still a lack of studies that focus on the influence of different dispersion methods on the final properties of these ternary systems. In the present work, direct and indirect ultrasonication methods were used to prepare single- and hybrid-filled GNP-CNT-epoxy nanocomposites, varying the amplitude and time of sonication in order to investigate their effect on electrical and thermomechanical properties. Impedance spectroscopy was combined with rheology and electron microscopy to show that high-power direct sonication tends to degrade electrical conductivity in GNP-CNT-epoxy nanocomposites due to damage caused in the nanoparticles. CNT-filled samples were mostly benefitted by low-power direct sonication, achieving an electrical conductivity of 1.3 × 10−3 S·m−1 at 0.25 wt.% loading, while indirect sonication was not able to properly disperse the CNTs and led to a conductivity of 1.6 ± 1.3 × 10−5. Conversely, specimens filled with 2.5 wt. % of GNP and processed by indirect sonication displayed an electrical conductivity that is up to 4 orders of magnitude higher than when processed by direct sonication, achieving 5.6 × 10−7 S·m−1. The introduction of GNP flakes improved the dispersion state and conductivity in hybrid specimens processed by indirect sonication, but at the same time impaired these properties for high-power direct sonication. It is argued that this contradictory effect is caused by a selective localization of shorter CNTs onto GNPs due to strong π-π interactions when direct sonication is used. Dynamic mechanical analysis showed that the addition of nanofillers improved epoxy’s storage modulus by up to 84%, but this property is mostly insensitive to the different processing parameters. Decrease in crosslinking degree and presence of residual solvent confirmed by Fourier-transform infrared spectroscopy, however, diminished the glass transition temperature of the nanocomposites by up to 40% when compared to the neat resin due to plasticization effects.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{UlloaRojas2021,

title = {Silk Fibroin/Poly(vinyl Alcohol) Microneedles as Carriers for the Delivery of Singlet Oxygen Photosensitizers},

author = {Jose Eduardo Ulloa Rojas and Vivian Leite de Oliveira and Daniele Ribeiro de Araujo and Giovana Radomille Tofoli and Matheus Mendes de Oliveira and Danilo J. Carastan and Moises Palaci and Francesca Giuntini and Wendel Andrade Alves},

url = {https://pubs.acs.org/doi/10.1021/acsbiomaterials.1c00913},

doi = {10.1021/acsbiomaterials.1c00913},

issn = {2373-9878},

year  = {2021},

date = {2021-11-09},

urldate = {2022-01-10},

journal = {ACS Biomater. Sci. Eng.},

volume = {8},

number = {1},

pages = {128--139},

publisher = {American Chemical Society (ACS)},

abstract = {Photodynamic therapy (PDT) is a medical treatment in which a combination of a photosensitizing drug and visible light produces highly cytotoxic reactive oxygen species (ROS) that leads to cell death. One of the main drawbacks of PDT for topical treatments is the limited skin penetration of some photosensitizers commonly used in this therapy. In this study, we propose the use of polymeric microneedles (MNs) prepared from silk fibroin and poly(vinyl alcohol) (PVA) to increase the penetration efficiency of porphyrin as possible applications in photodynamic therapy. The microneedle arrays were fabricated from mixtures in different proportions (1:0, 7:3, 1:1, 3:7, and 0:1) of silk fibroin and PVA solutions (7%); the polymer solutions were cast in polydimethylsiloxane (PDMS) molds and dried overnight. Patches containing grids of 10 × 10 microneedles with a square-based pyramidal shape were successfully produced through this approach. The polymer microneedle arrays showed good mechanical strength under compression force and sufficient insertion depth in both Parafilm M and excised porcine skin at different application forces (5, 20, 30, and 40 N) using a commercial applicator. We observe an increase in the cumulative permeation of 5-[4-(2-carboxyethanoyl) aminophenyl]-10,15,20-tris-(4-sulphonatophenyl) porphyrin trisodium through porcine skin treated with the polymer microneedles after 24 h. MNs may be a promising carrier for the transdermal delivery of photosensitizers for PDT, improving the permeation of photosensitizer molecules through the skin, thus improving the efficiency of this therapy for topical applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Santos2021,

title = {Microencapsulation of reactive isocyanates for application in self-healing materials: a review},

author = {Amanda N. B. Santos and Demetrio J. dos Santos and Danilo J. Carastan},

url = {https://www.tandfonline.com/doi/abs/10.1080/02652048.2021.1921068},

doi = {10.1080/02652048.2021.1921068},

issn = {1464-5246},

year  = {2021},

date = {2021-07-04},

urldate = {2021-07-04},

journal = {Journal of Microencapsulation},

volume = {38},

number = {5},

pages = {338--356},

publisher = {Informa UK Limited},

abstract = {Microencapsulation of curing agents is a major strategy for the development of self-healing polymers. Isocyanates are among the most promising compounds for the development of one-part, catalyst free, self-healing materials, but their microencapsulation is challenging due to their high reactivity. To keep the healing agent intact in the liquid state and containing free-NCO groups, the monitoring of several synthesis parameters is essential. This review aims to summarise the outcomes in the microencapsulation of isocyanates, emphasising the efforts reported in the literature to modulate the microcapsule properties. In this regard, the main synthesis procedures are presented, followed by the most relevant characterisation methods used to assess microcapsule properties. The correlation between these properties and synthesis parameters is also discussed, and finally the main potential and challenges for industrial applications are highlighted.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Santos2021b,

title = {Microencapsulation of reactive isocyanates for application in self-healing materials: a review},

author = {Amanda N. B. Santos and Demetrio Jackson dos Santos and Danilo J. Carastan},

url = {https://www.tandfonline.com/doi/abs/10.1080/02652048.2021.1921068},

doi = {10.1080/02652048.2021.1921068},

issn = {1464-5246},

year  = {2021},

date = {2021-07-04},

urldate = {2021-07-04},

journal = {Journal of Microencapsulation},

volume = {38},

number = {5},

pages = {338--356},

publisher = {Informa UK Limited},

abstract = {Microencapsulation of curing agents is a major strategy for the development of self-healing polymers. Isocyanates are among the most promising compounds for the development of one-part, catalyst free, self-healing materials, but their microencapsulation is challenging due to their high reactivity. To keep the healing agent intact in the liquid state and containing free-NCO groups, the monitoring of several synthesis parameters is essential. This review aims to summarise the outcomes in the microencapsulation of isocyanates, emphasising the efforts reported in the literature to modulate the microcapsule properties. In this regard, the main synthesis procedures are presented, followed by the most relevant characterisation methods used to assess microcapsule properties. The correlation between these properties and synthesis parameters is also discussed, and finally the main potential and challenges for industrial applications are highlighted.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}