Navegação Livros - Capítulos por Autores IPEN "LUGAO, ADEMAR B."

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  • IPEN-DOC 24662

    FRANCISCO, DANAE L. ; PAIVA, LUCILENE B. de; ALDEIA, WAGNER; LUGAO, ADEMAR B. ; MOURA, ESPERIDIANA A.B. . Characterization of non-covalently functionalized halloysite. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 317-323, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_34

    Abstract: The inorganic nanotube halloysite (HNT) is a promising type of natural occurring filler for polymers. Its characteristics, such as high aspect ratio (10–50), small size, and high strength (elastic modulus—140 GPa) suggest that HNTs have a potential use in high-performance polymer nanocomposites. Compared to other nanoclays and nanosilica the relatively low content of hydroxyl groups on their surfaces makes HNTs relatively hydrophobic, although, sometimes, this is not sufficient for guaranty a good interfacial adhesion in composite systems. Further hydrophobic treatment is required to improve HNTs compatibility with polymer matrixes, maximizing interfacial interactions. In the present study, different percentages of EPB (2,2-(1,2-ethene diyldi-4,1-phenylene) bisbenzoxazole) was used to perform a non-covalent functionalization of halloysite, based on electron transfer interactions. The functionalization is characterized by specific surface area (BET), thermogravimetric analysis (TG) and water/toluene extraction experiment.

    Palavras-Chave: nanotubes; silicate minerals; clays; benzoxazoles; thermal gravimetric analysis; toluene; polymers

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  • IPEN-DOC 23237

    OLIANI, WASHINGTON L. ; PARRA, DUCLERC F. ; LIMA, LUIS F.C.P. ; OTAGURO, HARUMI; FERRETO, HELIO F.R. ; LUGAO, ADEMAR B. . Contribution to the β relaxation study of the HDPE, LDPE and LLDPE. In: IKHMAYIES, SHADIA (Ed.); LI, BOWEN (Ed.); CARPENTER, JOHN S. (Ed.); LI, JIAN (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); ZHANG, MINGMING (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); BAI, CHENGUANG (Ed.); KALAY, YUNUS E. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. Gewerbestrasse, Switzerland: Springer International Publishing AG., 2017. p. 617-626, (The Minerals, Metals & Materials Series).

    Abstract: The activation of three polyethylenes, the low density, the high density and the linear low density polyethylene, was determined by means of dynamic mechanical analysis (DMA). Storage modulus and tan δ spectra were obtained as a function of the temperature from −60 to 50 °C with a heating rate of 2° min−1 at frequencies of 1, 2 and 5 Hz and measurement strain amplitude of 10−5. In the tan δ spectra, a small peak in the β region of the three polyethylenes was found and substantiated by subtracting the growing exponential background. This procedure was based on a model that associates the dislocation motion on metals under cyclic stress to vibrating strings and considering the same for the polymeric chains. For the determination of the activation energy we have utilized the frequency versus the reciprocal of the absolute temperature peak of the tan δ. The values obtained for the three polyethylenes, the low density, the high density and the linear low density were, 362 ± 12, 266 ± 9 and 197 ± 6 kJ mol−1, respectively, which were compared with those presented in the literature.

    Palavras-Chave: polyethylenes; relaxation; activation energy; density

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  • IPEN-DOC 28698

    THIPE, VELAPHI C. ; BATISTA, JORGE G.S. ; LUGAO, ADEMAR B. . Copper nanomaterials for eliminating the risk of mycotoxins. In: ABD-ELSALAM, KAMEL A. (Ed.). Copper Nanostructures: Next-Generation of Agrochemicals for Sustainable Agroecosystems. Amsterdam, Netherlands: Elsevier, 2022. p. 243-262, cap. 11. (Nanobiotechnology for Plant Protection). DOI: 10.1016/B978-0-12-823833-2.00026-X

    Abstract: Mycotoxins continue to pose significant challenges in agriculture and health sector. The most feasible strategy to eliminate their manifestation and risk is the use of fungicides against mycotoxigenic fungal contamination as an indirect approach. However, conventional fungicides have not been effectively attributed to acquired fungicide resistance and high toxicity on plants, animals, and human health. Copper (Cu) has been recognized as an essential micronutrient metal/mineral required by plants that participate in various physiological processes (chlorophyll and photosynthesis) and as a cofactor for enzymatic reactions including activation of many metalloproteins and those involved in lignin synthesis. Herein, we review Cu nanomaterials for the risk of mycotoxin also; we explore their nanofungicidal activity and the comprehensive understanding of the multitude of the tripartite interactions of Cu nanomaterials with the ecosystem (plants, soil, and animals/humans), and green nanotechnological approach in limiting their toxicity profile. Lately, we discuss some of the future recommendations for Cu nanofungicides toward eliminating the risk of mycotoxicology.

    Palavras-Chave: copper; nanomaterials; fungicides; mycotoxins; agriculture; nanotechnology

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  • IPEN-DOC 28699

    THIPE, VELAPHI C. ; FREITAS, LUCAS F. ; LIMA, CAROLINE S.A. de ; NOGUEIRA, KAMILA M. ; BATISTA, JORGE G.S. ; FERREIRA, ARYEL H. ; LUGAO, ADEMAR B. . Cu and Cu-based nanomaterials as nanofungicides. In: ABD-ELSALAM, KAMEL A. (Ed.). Copper Nanostructures: Next-Generation of Agrochemicals for Sustainable Agroecosystems. Amsterdam, Netherlands: Elsevier, 2022. p. 155-183, cap. 7. (Nanobiotechnology for Plant Protection). DOI: 10.1016/B978-0-12-823833-2.00020-9

    Abstract: Green nanotechnology through the production of copper and copper oxide nanoparticles (CuNPs and CuONPs, respectively) as nanofungicides brings forth the opportunity attributed to their antimicrobial properties in addition to Cu being an essential metal micronutrient that functions as a cofactor for many enzymatic activities in plants. Herein, we explore the use of CuNPs and CuONPs as nanofungicides against toxigenic fungi and their mechanism of action. We also highlight the green nanoagriculture and the ecotoxicology and safety of CuNPs and CuONPs as nanofungicides to significantly aid as agricultural breakthroughs because such approaches will provide realistic sustainable nano Cu-enabled products deemed safe for agricultural practices.

    Palavras-Chave: nanomaterials; copper; antimicrobial agents; nanoparticles; fungicides

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  • IPEN-DOC 25626

    ROMANO, REBECA da S.G. ; OLIANI, WASHINGTON L. ; KUMAR, VIJAYA R.; PARRA, DUCLERC F. ; LUGAO, ADEMAR B. . Differences in properties of pro-degradant added PP and gamma-irradiated PP under environmental aging. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); BAI, CHENGUANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); SPENA, PASQUALE R. (Ed.); GOSWAMI, RAMASIS (Ed.). Characterization of Minerals, Metals, and Materials. Cham, CZ, Switzerland: Springer Nature Switzerland AG, 2019. p. 591-603, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-030-05749-7_59

    Abstract: Polypropylene (PP) is used for different sectors of the industry and in consequence produces a large amount of waste discarded at landfills causing serious environmental impacts. Controlled degradation of PP can be achieved by exposing the polymers to defined parameters, such as absorbed radiation dose, weather, oxygen, etc. The aim of this study was to compare two methods of accelerated degradation: gamma irradiation of PP 20 kGy and the incorporation of the commercial pro-degradant d2w® (1 wt%) in PP. Dumbbell samples were manufactured by the injection process and exposed to the environment aging for 90 days. Structural changes in PP macromolecules are created upon exposure to ionizing radiation such as main chain scission, crosslinking and peroxidation (in presence of air). Differential scanning calorimetry (DSC), thermogravimetric analysis (TG), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDX), X-ray fluorescence, Fourier-transformed infrared spectroscopy (FTIR) and mechanical tests characterized the samples. The samples previously irradiated, PP 20 kGy, after natural aging showed higher oxidation and presence of surface cracks than the PP d2w®. They also showed presence of carbonyl groups and decrease of melting temperature corroborating with oxo-degradation.

    Palavras-Chave: polypropylene; ionizing radiations; gamma radiation; residues; wastes; environment; aging; calorimetry

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  • IPEN-DOC 24234

    ROMANO, REBECA S.G. ; OLIANI, WASHINGTON L. ; PARRA, DUCLERC F. ; LUGAO, ADEMAR B. . Effects of environmental aging in polypropylene obtained by injection molding. In: MAAZOUZ, ABDERRAHIM (Ed.). INTERNATIONAL CONFERENCE OF THE POLYMER PROCESSING SOCIETY, 32nd. Melville, NY: AIP Publishing, 2017. p. 140001-1 - 140001-5, (AIP Conference Proceedings 1914).

    Notas de conteúdo: Conference date: July 25-29, 2016. Location: Lyon, France

    Abstract: UV light, heat, and pollutants can interact with Polypropylene (PP) molecules, mainly with the tertiary carbon producing free radicals which can react with oxygen producing changes in its properties. PP has outstanding chemical and physical properties, and a good processability at very low market price. In addition PP is extensively used for manufacturing various kinds of products, however due to its large scale consumption a lot of waste is generated at the end of their life cycle to the environment with low rate degradation. This study has the objective of comparing the environmental exposure of PP (spheres) neat and PP (spheres) irradiated with 20 kGy. Dumbbell samples were manufactured by injection molding and exposed to the environment during 90 days. Another one set was exposed to gamma irradiation at 20 kGy total dose and exposed at the same conditions. The samples were characterized by Mechanical Testing, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Differential Scanning Calorimetry (DSC). The dumbbell samples PP 20 kGy, after environmental aging, showed oxidation with presence of surface cracks more intensely than the PP spheres neat.

    Palavras-Chave: gamma radiation; polypropylene; environmental exposure; environment; aging

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  • IPEN-DOC 29813

    THIPE, VELAPHI C. ; FREITAS, LUCAS F. ; LIMA, CAROLINE S.A. ; BATISTA, JORGE G.S. ; FERREIRA, ARYEL H.; OLIVEIRA, JUSTINE P.R. de ; BALOGH, TATIANA S. ; KADLUBOWSKI, SLAWOMIR; LUGAO, ADEMAR B. ; KATTI, KATTESH V.. Fabrication of green nanomaterials: biomedical applications and ecotoxicology. In: SHANKER, UMA (Ed.); HUSSAIN, CHAUDHERY M. (Ed.); RANI, MANVIRI (Ed.). Handbook of Green and Sustainable Nanotechnology. Cham, Switzerland: Springer Nature, 2023. p. 23-46, cap. 2. DOI: 10.1007/978-3-031-16101-8_2

    Abstract: The purpose of this chapter is to discuss the production of biocompatible green nanomaterials for biomedical applications using green nanotechnology. To enhance drug loading and delivery, these nanomaterials are engineered with immunomodulatory ligands such as phytochemicals (Epigallocatechin gallate, Mangiferin, Resveratrol), proteins (albumin and papain), crosslinked hydrogels, and nanogels. The nanomaterials described herein are synthesized via redox potential of electron-dense phytochemicals that reduce metallic precursors to their stable corresponding nanoparticles and via water radiolysis with ionizing radiation as a green approach (due to the absence of any reducing agent) for use as radiosensitizers (albumin and papain nanoparticles) in nuclear medicine – theranostics applications. The phytochemicals facilitate the delivery of nanoparticles through receptor mediated endocytosis, while the proteins such as papain, due to their proteolytic action enhances the permeation of nanoparticles into tumor tissue, and albumin increase the pharmacokinetic efficiency of these nanoparticles. The nanoparticles developed have shown effectiveness against a variety of human cancers while posing no toxicity to normal tissue. Additionally, a pilot human clinical combing Ayurvedic medicine with green nanomedicine is given as a novel approach for treating breast cancer and other related illnesses. Finally, the importance of ecotoxicology for nanomaterials is discussed in order to provide safety data in relevant multiple species (fish, daphnia, algae, rodents, etc.) with paratope/epitope distributions for evaluating tissue cross-reactivity profiles in human tissues and to provide critical information on in vivo toxicity in order to predict the possible adverse effects of nanomaterials on human and environmental health as an effort to establish regulatory limits and ISO standards for nanomaterials.

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  • IPEN-DOC 25629

    FRANCISCO, DANAE L. ; PAIVA, LUCILENE B. de; ALDEIA, WAGNER; LUGAO, ADEMAR B. ; MOURA, ESPERIDIANA A.B. . Investigation on mechanical behaviors of polyamide 11 reinforced with halloysite nanotubes. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); BAI, CHENGUANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); SPENA, PASQUALE R. (Ed.); GOSWAMI, RAMASIS (Ed.). Characterization of Minerals, Metals, and Materials. Cham, CZ, Switzerland: Springer Nature Switzerland AG, 2019. p. 693-701, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-030-05749-7_69

    Abstract: The inorganic halloysite nanotubes (HNTs) are a promising type of natural occurring filler for polymers. Its characteristics such as high aspect ratio (10–50), small size, and high strength (elastic modulus—140 GPa) suggest that HNTs have a potential use in high-performance polymer nanocomposites. Compared to other nanoclays and nanosilica, the relatively low content of hydroxyl groups on their surfaces makes HNTs relatively hydrophobic, although, sometimes, this is not sufficient for guaranty a good interfacial adhesion in composite systems. In the present study, halloysite nanotubes were incorporated in a polyamide 11 (PA11) matrix by melt extrusion, using a twin-screw extruder and injection molding machine. The neat PA11 and PA11/HNT nanocomposites were characterized by mechanical tests (tensile, flexural and impact tests), and the correlation between properties were discussed.

    Palavras-Chave: polyamides; nanostructures; nanotubes; nanocomposites; mechanical properties; thermoplastics; inorganic polymers; tensile properties

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  • IPEN-DOC 24658

    OLIANI, WASHINGTON L. ; PARRA, DUCLERC F. ; RANGARI, VIJAYA K.; LINCOPAN, NILTON; LUGAO, ADEMAR B. . Irradiation influence on the properties of HMS-Polypropylene Clay/AgNPs nanocomposites. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG, 2018. p. 583-595, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_62

    Abstract: Due to its versatility and low cost, polypropylene (PP) is one of the most widely used polymers in the world, consequently in research and development of new products. The polypropylene modified was prepared by gamma irradiation in acetylene at 12.5 kGy dose, technical polymer also known as high-melt-strength-polypropylene (HMSPP). It was mixed with montmorillonite (MMT) clay and silver nanoparticles (AgNPs) for bactericide activity. HMS-Polypropylene-clay -silver nanocomposites were manufactured using twin-screw extruders. Those materials were prepared by a melt mixing process via twin screw extrusion with a wide range of processing conditions. The polypropylene nanocomposites (PPNC) surfaces were exposed to gamma-radiation (60Co) source in presence of nitrogen as inert atmosphere at 1; 3; 5; 10; 20 and 50 kGy doses for modified the surfaces in order to enhance biocide activity. The samples surfaces were characterized by Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDX) and evaluated by determination of bactericide effects. The results indicate the formation of structures predominantly intercalated of HMSPP nanocomposite. Contact tests for antibacterial activity of the hybrid polymer were applied against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria. The irradiations on the samples surfaces were insufficient to promote activity on contact biocide tests.

    Palavras-Chave: nanocomposites; polypropylene; irradiation; gamma radiation; silver; clays; germicides; montmorillonite

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  • IPEN-DOC 25621

    BRIGGS, EXAMPLE; MOURA, ESPERIDIANA A.B. de ; FURUSAWA, HELIO A. ; COTRIM, MARYCEL E.B. ; OGUZIE, EMEKA E.; LUGAO, ADEMAR B. . Microplastics: a novel method for surfacewater sampling and sample extraction in Elechi Creek, Rivers State, Nigeria. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); BAI, CHENGUANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); SPENA, PASQUALE R. (Ed.); GOSWAMI, RAMASIS (Ed.). Characterization of Minerals, Metals, and Materials. Cham, CZ, Switzerland: Springer Nature Switzerland AG, 2019. p. 269-281, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-030-05749-7_27

    Abstract: The geometric increase in the production and exploitation of plastics worldwide has several advantages as well as disadvantages due to the mismanagement of plastic waste. These waste products find its way into the aquatic body. Microplastics are plastic particles with its longest diameter less than or equal to 5 mm. Their microscopic nature, irregular color and morphology have made their extraction from the buoyant organic materials problematic. This work documents for the first time, the sampling and sample extraction of microplastics in Nigeria. An optimized sampling and sample extraction protocol for surfacewaterwas developed. The extraction protocolwas developed in a laboratory study using a simulated sample that mimics the environmental sample (microplastics+organic materials). A micronized LDPE (<300 μm) was used for the study and yielded a percentage recovery rate of 82%. The digested microplastics which were subjected to SEM analysis showed a slight change in the surface morphology. Thereafter, the environmental sample was extracted using the developed laboratory protocol and a high positive result was achieved. This protocol improved NOAA’s method of extraction by excluding the use of microscope for the final extraction, which, of course, will yield a biased result. This was achieved by the addition of ethanol to the final solution.

    Palavras-Chave: plastics; pollutants; water pollution; microstructure; sampling; africa; rivers; separation processes; densimeters; plankton; nanoparticles; wet oxidation processes; peroxides; sample preparation; ethanol; scanning electron microscopy

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  • IPEN-DOC 29814

    THIPE, VELAPHI C.; MENDES, GIOVANNA de O.A. ; ALVES, VICTORIA M. ; SOUZA, THAYNA ; AJAYI, RACHEL F.; LUGAO, ADEMAR B. ; KATTI, KATTESH V.. Nanodiagnostic tools for mycotoxins detection. In: LIM, KI-TAEK (Ed.); ABD-ELSALAM, KAMEL A. (Ed.). Nanorobotics and Nanodiagnostics in Integrative Biology and Biomedicine. Cham, Switzerland: Springer Nature, 2022. p. 361-381, cap. 15. DOI: 10.1007/978-3-031-16084-4_15

    Abstract: In recent decades, mycotoxin contamination of agricultural food items has garnered considerable attention because to their high acute or chronic toxicity in humans and animals, resulting from consumption and exposure duration to contaminated food or feed. This is exacerbated by the impact of the Covid-19 pandemic, civil wars, and conflicts (e.g., the Russia-Ukraine conflict, Yemen, Ethiopia, Afghanistan, and others), which further strain the food security and nutritional status of the most vulnerable demographic groups, which are predicted to continue to deteriorate due to health and socioeconomic factors. The presence of these mycotoxins in food and animal feed has a negative impact on public health and the economy; consequently, it is crucial to detect and quantify these toxins in agricultural lots. Maintaining food quality and minimizing adverse effects on human and animal health are dependent on early detection. Conventional techniques for detecting mycotoxins include enzyme-linked immunoassay (ELISA), gas chromatography (GC), thin-layer chromatography (TLC), and high-performance liquid chromatography (HPLC). Nanomaterial-based sensor technologies provide diverse mitigation methods for quantifying single or multiple analytes, as mycotoxin co-occurrence in a single matrix has become more common. In this chapter, we describe recent advancements in nanodiagnostic techniques that permit multiplex detection of mycotoxins on a single platform. In addition, we discuss certain commercially available lateral flow immunoassay (LFIA) test strips that often use gold nanoparticles (AuNPs) or quantum dots (QDs) as colored labels for signal amplification, as well as some commercial goods with nanoformulations used in agriculture. For the commercialization of nano-based assays (nanosensors), nanodisks (nanoparticles-based artificial sensing), and that may be used as point-of-care testing (POCT) devices for mycotoxin detection, it will be necessary to conduct additional research and make additional investments to overcome the difficulties identified.

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  • IPEN-DOC 23238

    OLIANI, WASHINGTON L. ; FERMINO, DANILO M.; KOMATSU, LUIZ G.H. ; LUGAO, ADEMAR B. ; RANGARI, VIJAYA K.; LINCOPAN, NILTON; PARRA, DUCLERC F. . Preparation and characterization of polyethylene nanocomposites with clay and silver nanoparticles. In: IKHMAYIES, SHADIA (Ed.); LI, BOWEN (Ed.); CARPENTER, JOHN S. (Ed.); LI, JIAN (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); ZHANG, MINGMING (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); BAI, CHENGUANG (Ed.); KALAY, YUNUS E. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. Gewerbestrasse, Switzerland: Springer International Publishing AG., 2017. p. 709-718, (The Minerals, Metals & Materials Series).

    Abstract: Polyethylene is widely used for packing applications. Different grades of polyethylene, LLDPE and LDPE play a major role in the film blowing industry. The use of nanoclay in polymer matrices (non-polar) requires the use of a compatibilizer agent, ethylene graft maleic anhydride copolymer (PE-g-MA), which acts as a bridge for nanoclay-matrix-interaction. In our study, blown films of LLDPE, LDPE, and their blends were produced using a twin screw extruder. The combination of PEs as matrix, montmorillonite (MMT) and silver nanoparticles (AgNPs) intended to improve mechanical and thermal properties. Nanocomposites films with 1 wt% of montmorillonite and 0.5–1.0 wt% silver nanoparticles were prepared by blow extrusion and evaluated. Nanoclay intercalation/exfoliation degree was investigated by X-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM). Mechanical and thermal properties were evaluated. The results showed optimum dispersion at intercalation/exfoliation levels for polyethylene nanocomposite (PENC), slight increasing in mechanical and especially improvement in thermal properties.

    Palavras-Chave: polyethylenes; silver; nanoparticles; films; montmorillonite; clays

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  • IPEN-DOC 27630

    OLIANI, WASHINGTON L. ; KOMATSU, LUIZ G.H. ; LUGAO, ADEMAR B. ; RANGARI, VIJAYA K.; PARRA, DUCLERC F. . Processing and characterization of polyethylene-AgNPs films: biocide effect. In: LI, JIAN (Ed.); ZHANG, MINGMING (Ed.); LI, BOWEN (Ed.); MONTEIRO, SERGIO N. (Ed.); IKHMAYIES, SHADIA (Ed.); KALAY, YUNUS E. (Ed.); HWANG, JIANN-YANG (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); CARPENTER, JOHN S. (Ed.); BROWN, ANDREW D. (Ed.). Characterization of Minerals, Metals, and Materials. Cham, CZ, Switzerland: Springer Nature Switzerland AG, 2020. p. 679-688, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-030-36628-5_67

    Abstract: Low-density-polyethylene (LDPE) and Linear-low-density-polyethylene (LLDPE) nanocomposites films containing silver nitrate (AgNO3) and surfactant oleic acid (AO) were manufactured via extrusion and subsequently characterised. The films were evaluated by scanning electronmicroscopy (SEM), energy dispersive spectroscopy (EDX), differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and infrared spectroscopy (FTIR). Further, the antibacterial properties of the films were investigated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) bacteria.The results indicated that LDPE nanocomposite films containing AgNPs have the potential to be used in antimicrobial packaging for food applications.

    Palavras-Chave: nanocomposites; polyethylenes; silver nitrates; oleic acid; germicides

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  • IPEN-DOC 28536

    THIPE, VELAPHI C. ; LIMA, CAROLINE S.A. ; NOGUEIRA, KAMILA M. ; BATISTA, JORGE G.S. ; FERREIRA, ARYEL H. ; KATTI, KATTESH V.; LUGAO, ADEMAR B. . Silver nanoparticles applications and ecotoxicology for controlling mycotoxins. In: ABD-ELSALAM, KAMEL A. (Ed.). Silver Nanomaterials for Agri-Food Applications. Amsterdam, Netherlands: Elsevier, 2021. p. 549-575, cap. 23. DOI: 10.1016/B978-0-12-823528-7.00019-6

    Palavras-Chave: nanoparticles; silver; mycotoxins; fungi; nutritional deficiency; agriculture

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  • IPEN-DOC 26703

    CARDOSO, ELIZABETH C.L. ; PARRA, DUCLERC F. ; SCAGLIUSI, SANDRA R. ; SALES, RICARDO M. ; CAVIQUIOLI, FERNANDO ; LUGAO, ADEMAR B. . Study of bio-based foams prepared from PBAT/PLA reinforced with bio-calcium carbonate and compatibilized with gamma radiation. In: ALMAYAHI, BASIM (Ed.). Use of Gamma Radiation Techniques in Peaceful Applications. London, UK: IntechOpen, 2019. p. 1-17, cap. 9. DOI: 10.5772/intechopen.85462

    Abstract: Foamed polymers are future materials, considered “green materials” due to their properties with very low consumption of raw materials; they can be used to ameliorate appearance of structures besides contributing for thermal and acoustic insulation. Nevertheless, waste disposal has generated about 20–30% of total of solid volume in landfills besides prejudicing flora and fauna by uncontrolled disposal. The development of biodegradable polymers aims to solve this problem, considering that in 2012, bio-plastics market was evaluated in 1.4 million tons produced and in 2017 attained 6.2 million tons. Biodegradable polymers as poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) are thermoplastics which can be processed using the most conventional polymer processing methods. PLA is high in strength and modulus but brittle, while PBAT is flexible and tough. In order to reduce interfacial tension exhibited by PLA/PBAT blends, it was used as compatibilizing agent 5 phr of PLA previously gamma-radiated at 150 kGy. Ionizing radiation induces compatibilization by free radicals, improving the dispersion and adhesion of blend phases, without using chemical additives and at room temperature. As a reinforcement agent, calcium carbonate from avian eggshell waste was used, at 10 ph of micro particles, 125 μm. Admixtures were further processed in a singlescrew extruder, using CO2 as physical blowing agent (PBA). Property investigations were performed by DSC, TGA, XRD, SEM, FTIR, and mechanical essays.

    Palavras-Chave: butenes; gamma radiation; eggs; shells; compatibility; polymers

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  • IPEN-DOC 24657

    ZAFALON, ANGELICA T. ; SANTOS, VINICIUS J. dos ; ESPOSITO, FERNANDA; LINCOPAN, NILTON; RANGARI, VIJAYA; LUGAO, ADEMAR B. ; PARRA, DUCLERC F. . Synthesis of polymeric hydrogel loaded with antibiotic drug for wound healing applications. In: LI, BOWEN (Ed.); LI, JIAN (Ed.); IKHMAYIES, SHADIA (Ed.); ZHANG, MINGMING (Ed.); KALAY, YUNUS E. (Ed.); CARPENTER, JOHN S. (Ed.); HWANG, JIANN-YANG (Ed.); MONTEIRO, SERGIO N. (Ed.); FIRRAO, DONATO (Ed.); BROWN, ANDREW (Ed.); BAI, CHENGUANG (Ed.); PENG, ZHIWEI (Ed.); ESCOBEDO-DIAZ, JUAN P. (Ed.); GOSWAMI, RAMASIS (Ed.); KIM, JEONGGUK (Ed.). Characterization of Minerals, Metals, and Materials. TMS. Cham, CZ, Switzerland: Springer International Publishing AG., 2018. p. 165-176, (The Minerals, Metals & Materials Series). DOI: 10.1007/978-3-319-72484-3_18

    Abstract: Polymeric hydrogels are natural or synthetic systems, which have gained interest due to their high biocompatibility with soft tissues. These types of hydrogels have been used for wound dressing as a drug delivery system. Here in this study the polymeric hydrogels based wound healing systems were prepared using poly (N-vinyl-2-pyrrolidone) (PVP), poly (ethylene glycol) (PEG), agar and neomycin drug followed by gamma irradiation to promote crosslinking and sterilization. The influence of irradiation process with 25 kGy dose was investigated. The gel fraction and maximum swelling were estimated using physicochemical methods and found about 95% gel fraction and 1100% swelling after 8 h of immersion. Neomycin released from hydrogel was carried out by Liquid Chromatography-Mass Spectrometry method and the drug concentration remained constant for 48 h. Hydrogel/neomycin exhibited antibacterial effects against Staphylococcus aureus. With these results, it can be inferred that hydrogel/neomycin is a suitable candidate for wound dressing.

    Palavras-Chave: hydrogels; polymers; antibiotics; drugs; wounds; neomycin; pvp; irradiation

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  • IPEN-DOC 28700

    THIPE, VELAPHI C. ; MENTOR, SHIREEN; LIMA, CAROLINE S.A. ; FREITAS, LUCAS F. ; FONSECA, ANA C.M.; NOGUEIRA, KAMILA M. ; RODRIGUES, ADRIANA S. ; BATISTA, JORGE G.S. ; FERREIRA, ARYEL H. ; LUGAO, ADEMAR B. . The role of probiotics in maintaining immune homeostasis. In: DWIVEDI, M.K. (Ed.); AMARESAN, N. (Ed.); SANKARANARAYANAN, A. (Ed.); HELEN KEMP, E. (Ed.). Probiotics in The Prevention and Management of Human Diseases. London, United Kingdom: Academic Press, 2022. p. 41-58, cap. 3. (A Scientific Perspective). DOI: 10.1016/B978-0-12-823733-5.00024-6

    Abstract: The immune system is a complex architecture of a collective and coordinated network regulated by various pathways to thermodynamically maintain immune homeostasis. The gut microbiota plays a pivotal role that offers significant stimuli (i.e., gut-brain, gut-lung, and gut-liver axis) for both innate and adaptive immunity, mediating immune and metabolic homeostasis. An intricate correlation between changes in the gut microbiota (dysbiosis) and common diseases/disorders have been attributed to the invasion of pathogens, constant use of antibiotics, and hypercytokinemia—a hallmark of immune homeostasis imbalance. These factors contribute to the severity of inflammatory diseases such as cardiovascular diseases, neurological disorders, and of late the coronavirus disease, Covid-19. Probiotics (Lactobacillus spp. and Bifidobacterium spp.) have been considered as alternative and/or adjuvant therapeutic in restoring the balance of gut microbiota for maintaining immune homeostasis and integrity. The probiotics catalyze dietary fibers and proteins to generate short-chain fatty acids and tryptophan to promote antiinflammatory cytokines, reduce epithelium permeability, reinforcing immunity in the gut mucosa, and regulating the systemic immune response. Herein, we review our overarching understanding of current applications of probiotics in amelioration of gut microbiome, and the improvement of gut barrier function and maintaining immune homeostasis. We also highlight clinical trials on probiotics with reported results for the treatment of inflammatory diseases. Additionally, the looming global Covid-19 pandemic makes it prudent to highlight the role of probiotics in both the innate and adaptive human immune responses, especially amid the Covid-19 vaccination paradigm.

    Palavras-Chave: lactobacillus; fermentation; homeostasis; immunity; inflammation; intestines

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Exemplo:

Buscar os artigos apresentados em um evento internacional de 2015, sobre loss of coolant, do autor Maprelian.

Autor: Maprelian

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Tipo de publicação: Texto completo de evento

Ano de publicação: 2015

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O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

1. Portaria IPEN-CNEN/SP nº 387, que estabeleceu os princípios que nortearam a criação do RDI, clique aqui.


2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.