Navegação Eventos - Resumos por Autores IPEN "KODAMA, YASKO"

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  • IPEN-DOC 28095

    VIEIRA, ANA C.D.; KODAMA, YASKO ; OTUBO, LARISSA ; SANTOS, PAULO S. ; VASQUEZ, PABLO A.S. ; GARCIA, RAFAEL H.L. . Application of gamma irradiation to conservation: effects of ionizing radiation on the color of featherwork. In: ICOM-CC TRIENNIAL CONFERENCE, 19th, May 17-21, 2021, Beijing, China. Abstract... Paris, France: International Council of Museums, 2021.

    Abstract: Featherwork is one of the most remarkable categories of material culture produced by Brazilian indigenous peoples due to its technical qualities and aesthetic beauty. Weapons, baskets, and musical instruments are frequently decorated with feathers, which are also used in body adornments that, in addition to their aesthetic purpose, are intended to convey information about the wearer, their position within a group, and the cultural values that they wish to transmit. The preservation of this type of artifacts is demanding given the biological cycle of the organic materials that compose them, which are inevitably subject to various stages of deterioration. In addition to the damage resulting from their use and perishable materials, these ethnographic objects are exposed to a new environment when they are incorporated into museum collections, where their existence must be prolonged. Since Brazil’s tropical climate often leads to pest proliferation, their degradation can be exacerbated by the action of insects such as moths and microorganisms such as fungi with irreversible consequences, making their conservation a daily challenge. Although the art of featherwork is still practiced by indigenous communities, the scarce supply of raw materials and contact with the tribes involved has reduced the scale of production. The preservation of this material heritage is thus very important, particularly in ethnographic museums. The use of gamma radiation for the disinfestation of cultural heritage artifacts and archived materials has been shown to be a safe process and an excellent alternative to traditional methods, which usually involve toxic chemical pesticides. Ionizing radiation has been used for more than 40 years and, since 2004, the Multipurpose Irradiator at the Institute of Energy and Nuclear Research (IPEN), a pioneering technology developed in Brazil, has made its application to cultural heritage a reality. With more than 20,000 cultural artifacts irradiated, IPEN is currently the national and international reference center for the use of radiation technology applied to the preservation of cultural heritage collections. Several studies have been conducted to determine the optimal dose required to eliminate contamination by biological agents in organic materials such as wood, leather, and feathers.A maximum dose of 10 kGy is recommended for featherwork in order to avoid affecting the physical and chemical properties of this type of material. This poster reports on the results of the effects of ionizing radiation on the color and morphological properties of a featherwork from the Museum of Archaeology and Ethnology at the University of São Paulo (MAE/USP). Samples of feathers were selected and irradiated with gamma rays at the Multipurpose Gamma Irradiation Facility, applying absorbed doses of between 0.5 and 200 kGy. The samples were chosen according to the color of the feathers and then photographed and analyzed using colorimetry based on the CIELAB 1976 color space scale before and 48 hours after irradiation and scanning electron microscopy. There were no significant changes in morphological and color properties within the disinfestation range applied.

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  • IPEN-DOC 13237

    KODAMA, YASKO ; GIOVEDI, CLAUDIA; LIMA, NELSON B. ; MACHADO, LUCI D.B. ; NAKAYAMA, KAZUO. Effect of gamma radiation on PCL/PLLA blends. In: PROCEEDINGS OF THE SYMPOSIUM BRAZIL-JAPAN IN ECONOMY, SCIENCE AND TECHNOLOGICAL INNOVATION, June 14-16, 2008, Sao Paulo, SP. Abstracts... 2008. p. 45.

    Palavras-Chave: polymers; biodegradation; gamma radiation; lactic acid; organic polymers; x-ray diffraction; fourier transformation; infrared spectrometers

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  • IPEN-DOC 15393

    KODAMA, YASKO ; MACHADO, LUCI D.B. ; NAKAYAMA, KAZUO. Effect of gamma rays on thermal properties of biodegradacle alphatic polyesters blends. In: CONGRESSO BRASILEIRO DE ANALISE TERMICA E CALORIMETRIA, 5., 2-5 de abril, 2006, Pocos de Caldas, MG. Resumo... 2006.

    Palavras-Chave: polymers; biodegradation; ionizing radiations; thermodynamic properties

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  • IPEN-DOC 26550

    LIMA, LENI M.P.R. ; KODAMA, YASKO ; OTUBO, LARISSA ; SANTOS, PAULO S. ; VASQUEZ, PABLO A.S. . Effect of ionizing radiation on the color of botanical collections: exsiccata. In: VASQUEZ, PABLO A.S. (Ed.); NAGAI, MARIA L.E. (Coord.) INTERNATIONAL SYMPOSIUM ON GAMMA IONIZATION: TECHNOLOGY FOR PRESERVATION OF CULTURAL HERITAGE, 1st, October 25, 2019, São Paulo, SP. Abstract... São Paulo, 2019.

    Abstract: Conservation and preservation methods are essential to maintain the wholeness of botanical collections specially for dried herbarium specimens also known as exsiccates, usually referring to a set of identified specimens belonging to taxa and distributed among all herbaria around the world. These vegetal materials are subjected to fungal attack and insect pests threatening their entirety. In recent years, disinfection by ionizing radiation has become an effective strategy to preserve cultural heritage objects and archived materials with excellent results. In this work, the effects on color properties of exsiccates samples irradiated with gamma radiation from Co-60 with different absorbed doses were studied. The botanical pressed and dehydrated samples – exsiccates – were selected from the Dom Bento José Pickel Herbarium (SPSF), located at São Paulo (Brazil). Two exsiccate samples were selected: SPSF-4021 and SPSF-08821. These samples come from Asteraceae and Solanaceae family and were collected in 1946 and 1984, respectively. Families of selected botanical collections are very susceptible to biodegradation. The irradiation was performed at the Multipurpose Gamma Irradiation Facility at IPEN applying absorbed doses of 1 kGy, 6 kGy and 10 kGy. The selected ranged dose promotes insect disinfestation and fungal disinfection. Results were analyzed using colorimetry with CIELAB color space scale. Scanning electron microscopy were performed to analyze surface topography and elemental structure modifications by ionizing radiation and characterize the non-irradiated (0 kGy) and the effective disinfected (10 kGy) exsiccata samples. The results revealed no significant changes on colorimetric morphological properties of then irradiated samples. The color changes between the non-irradiated samples and the irradiated sample at the high absorbed dose are perceptible, but acceptable considering the adopted scale. The microscopy images of the non-irradiated and 10 kGy irradiated samples did not show significant differences in the topographic morphology of the exsiccata samples. The results obtained corroborate the studies of the application of gamma radiation to preserve materials of cellulosic origin. Subsequently and for continuity of this research, other samples will be analyzed.

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  • IPEN-DOC 26542

    VIEIRA, ANA C.D.; KODAMA, YASKO ; OTUBO, LARISSA ; SANTOS, PAULO S. ; VASQUEZ, PABLO A.S. . Effect of ionizing radiation on the color of featherwork. In: VASQUEZ, PABLO A.S. (Ed.); NAGAI, MARIA L.E. (Coord.) INTERNATIONAL SYMPOSIUM ON GAMMA IONIZATION: TECHNOLOGY FOR PRESERVATION OF CULTURAL HERITAGE, 1st, October 25, 2019, São Paulo, SP. Abstract... São Paulo, 2019.

    Abstract: Featherwork collections are usually stored and managed by ethnographic museums. Even though the featherwork manufacturing is still practiced by the indigenous communities, the offer of raw material and the contact with the surrounding society ended up reducing the production scale of such objects. Consequently, the preservation of the culture heritage is very important, particularly in museums. Biodegradation can affect featherworks mainly by xylophagous insects and moths’ action. The tropical Brazilian weather contributes to the contamination and proliferation of insects and fungi making the preservation conditions difficult. The use of gamma radiation for the disinfection of cultural heritage objects and archived materials has shown to be a safe process and an excellent alternative to traditional methods usually involving high persistent and toxic chemical pesticides. In this work are presented the preliminary results of the ionizing radiation effects on the color and morphological properties of a featherwork from the Museum of Archeology and Ethnology of the University of São Paulo (MAE/USP). Samples of feathers were selected from the artifact and irradiated with gamma rays at the Multipurpose Gamma Irradiation Facility at IPEN, applying absorbed doses between 0.5 kGy to 200 kGy. Samples were firstly chosen according to feather colors, photographed and analyzed using colorimetry with CIELAB 1976 color space scale and scanning electron microscopy (SEM), just after and 48 hours after the irradiation process. The results shown had no significant changes on color and morphological properties within the disinfection absorbed dose range applied.

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  • IPEN-DOC 29481

    KODAMA, YASKO ; BIANCOLLI, ANA L. ; BARBOSA, ANDREY ; SANTIAGO, ELISABETE . Effects of gamma radiation absorbed dose on VBC grafting onto LDPE films and on anion exchange membrane fuel cells performance. In: INTERNATIONAL CONFERENCE ON APPLICATIONS OF RADIATION SCIENCE AND TECHNOLOGY, 2nd, August 22-26, 2022, Vienna, Austria. Abstract... Vienna, Austria: International Atomic Energy Agency (IAEA), 2022.

    Abstract: Anion-Exchange Membranes (AEMs) are polymer electrolytes that conduct anions, such as OH- and Cl-, as they contain positively charged [cationic] groups (typically) bound covalently to a polymer backbone. It is possible to take advantage of this characteristic for electrochemical devices, such as fuel cells. Fuel cells are electrochemical systems that convert chemical energy into electrical energy through continuous feeding fuel. These systems represent an alternative technology of electricity with great efficiency and large applicability in the areas of portable, stationary, and automotive powers due to important improvements achieved in the field of electrocatalysis in the past decade. In this present research, AEMs based on films of low density polyethylene (LDPE), were synthesized by radiation induced grafting with 4-vinylbenzylchloride (VBC) monomer solution using direct method. Samples were irradiated with gamma rays from Co-60 at room temperature, in nitrogen and/or air atmosphere at Gammacell of IPEN-CNEN/SP. Several radiation absorbed doses (10-30kGy) were used to study degree of grafting (DoG) of VBC onto LDPE gamma irradiated films. The optimization of parameters and conditions of irradiation have been evaluated by degree of grafting. Functionalization with quaternary ammonium groups was made in water by using trimethylamine (TMA). After, treatment with NaCl for Cl-groups addition was performed, responsible for ionic exchange and ionic groups stabilization. Then, hydroxylation reaction was performed with KOH for hydroxyl groups addition (anionic exchange of Cl- groups by OH-). Besides DoG, characterization of the ion exchange membranes was performed at IPEN-CNEN/SP involving determination of physico-chemical properties such as water uptake, ion exchange capacity and ionic conductivity. Furthermore, AC impedance spectroscopy, scanning electron microscopy (SEM) were performed for characterization of radiation grafted membranes. DoG increased with radiation absorbed dose increase, homopolymerization affected some grafted membranes at high radiation absorbed doses. Also, atmosphere of irradiation affected the DoG. The resulting AEM synthesized by RIG of VBC onto LDPE with 30 kGy radiation absorbed was tested in a fuel cell and reached a maximum power density of 942 mW cm−2 at 80 ℃ with gases flow of 0.8 L min-1 and 0.5 L min-1 for H2 and O2, respectively.

    Palavras-Chave: anions; ion exchange; membranes; fuel cells; gamma radiation; electrochemical cells

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  • IPEN-DOC 15539

    KODAMA, YASKO ; MACHADO, LUCI D.B. ; GIOVEDI, CLAUDIA; NAKAYAMA, KAZUO. Gamma radiation effect on structural properties of PLLA/PCL blends. In: INTERNATIONAL SYMPOSIUM ON IONIZING RADIATION AND POLYMERS, 7th, September 23-28, 2006, Antalya, Turquia. Abstract... 2006.

    Palavras-Chave: polymers; lactic acid; gamma radiation; cobalt 60; ionizing radiations; radiation effects; scanning electron microscopy; morphological changes; radiolysis

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  • IPEN-DOC 26553

    KODAMA, YASKO ; RODRIGUES JUNIOR, ORLANDO ; GARCIA, RAFAEL H.L. ; OTUBO, LARISSA ; SANTOS, PAULO S. ; VASQUEZ, PABLO A.S. . Kinetics of Free Radicals Decay Reactions in Cellulosic Based Heritage Materials Disinfected by Gamma Radiation. In: VASQUEZ, PABLO A.S. (Ed.); NAGAI, MARIA L.E. (Coord.) INTERNATIONAL SYMPOSIUM ON GAMMA IONIZATION: TECHNOLOGY FOR PRESERVATION OF CULTURAL HERITAGE, 1st, October 25, 2019, São Paulo, SP. Abstract... São Paulo, 2019.

    Abstract: In this study, contemporary paper samples were irradiated using gamma radiation from Co-60 with different absorbed doses. The absorbed dose range was chosen taking into account the effective values to promote insect eradication, fungal disinfection and sterilization. The kinetics of decay of the cellulose free radicals induced by irradiation was analyzed using Electron Paramagnetic Resonance. Several spectra were obtained at room temperature for each applied absorbed dose immediately after irradiation as reference measurements. In order to understand the decay process of free radicals, additional spectra were obtained for different decay times up to almost 50 days after irradiation. De-noising treatment of the original obtained spectra signals were performed using wavelets. By integrating the electron paramagnetic resonance curves were calculated the area values and correlated to concentration, it is equivalent to spin concentration. Comparison of spectra was done by normalization of calculated area corresponding to cellulose spin concentration, considering the first measurement after irradiation as 100%. Further analyses and calculations were made to study the half-life and the kinetics models of the free radicals created. X-ray diffraction was carried out to identify crystalline phases and the effect of ionizing radiation on the crystalline structure of cellulose in paper. Scanning electron microscopy and Scanning Electron Microscopy Energy Dispersive Spectrometry were performed to analyze structure modifications by ionizing radiation, identifying cellulose fiber agglomeration zones and to quantify chemical elements. Likewise, samples were analyzed by infrared spectroscopy to determinate changes on the carbonyl groups. Results shown that for sterilization dose, 80% of the cellulose free radicals induced by ionizing radiation disappear in almost 40 days and for disinfection dose in 8 days. It can be concluded that if no significant modifications (side-effects) appear in the irradiated material after the radical decay time, the material will stay stable for the remaining lifetime. Proposed method using electron paramagnetic resonance results showed suitably to study the behavior of radicals on cellulosic based cultural heritage materials.

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  • IPEN-DOC 29477

    VASQUEZ, PABLO A.S. ; VIEIRA, ANA C.; LIMA, LENI; NAGAI, MARIA L.; KODAMA, YASKO ; OLIVEIRA, MARIA J. ; SANTOS, PAULO . New trends and applications of ionizing radiation for preservation of cultural heritage tangible materials. In: INTERNATIONAL CONFERENCE ON APPLICATIONS OF RADIATION SCIENCE AND TECHNOLOGY, 2nd, August 22-26, 2022, Vienna, Austria. Abstract... Vienna, Austria: International Atomic Energy Agency (IAEA), 2022.

    Abstract: Disinfection of cultural heritage artefacts and archived materials using ionizing radiation has been successfully applied and accepted by the Brazilian conservation and preservation institutions and community in recent years. Several works of art, museum collections artefacts, books, manuscripts, drawings, archive documents, musical instruments, ethnographic objects, archaeological findings and natural history collections have been decontaminated. Several research studies have been developed addressing the behaviour of cellulosic based materials treated with the ionizing radiation. However, many Brazilian collections have objects made from the most diverse constitutive materials and these are affected by biodeterioration. In order to the effective decontamination of the most diverse types of objects there was a need to establish protocols for care of institutions and individuals carrying cultural and historical collections and for the effective processing by ionizing radiation in the facilities respecting the ethical principles of conservation and restoration covering activities from the problem detection to the final cleaning. Additionally, ionizing radiation has allowed the development of innovative nanostructured cross-linked materials, with applicability in cleaning delicate surfaces. This work presents the most recent results of the effect of ionizing radiation on morphology and physicochemical properties of photographic and cinematographic films, featherwork and botanical collections – exsiccate; as well as the protocols developed as a practical guide for conservatives and professionals of the irradiation for treatment of tangible objects. Preliminary results of nanostructured cross-linked polymeric hydrogels for cleaning surface of artworks obtained by ionizing radiation are also presented. The IAEA sponsored projects have helped to increase the acceptance of nuclear technology by the Brazilian society, especially by the community of restorers, curators and conservators of material cultural goods. The research developed and disseminated with the support of IAEA contributes to the understanding that the cultural heritage is the legacy of physical artefacts and intangible attributes of a group or society that are inherited from past generations, maintained in the present and restored for the benefit of future generations.

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  • IPEN-DOC 16291

    KODAMA, YASKO ; LIMA, NELSON B. ; MACHADO, LUCI D.B. ; NAKAYAMA, KAZUO; LACERDA, ANDRE T. de. PCL, PLLA homopolymers and PCL/PLLA blend gamma irradiated investigation by wide-angle x-ray diffraction. In: INTERNATIONAL SYMPOSIUM ON IONIZING RADIATION AND POLYMERS, 8th, 12-17 de outubro, 2008, Angra dos Resis, RJ. Abstract... 2008. p. 69.

    Palavras-Chave: polymers; biodegradation; gamma radiation; cobalt 60; radiation effects; crystal structure; x-ray diffraction; diffractometers

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  • IPEN-DOC 29195

    SANTOS, BIANCA P.S. ; KODAMA, YASKO ; SANTIAGO, ELISABETE I. . Synthesis and characterization of fluoropolymer membrane using RIG and reversible addition-fragmentation- chain-transfer (RAFT) method for fuel cell application. In: BRAZIL MRS MEETING, 20th, September 25-29, 2022, Foz do Iguaçu, PR. Abstract... São Carlos, SP: Aptor Software, 2022.

    Abstract: Anion exchange fuel cells (AEMFC) have attracted widespread attention in the last years and are considered one of the most promising environmentally friendly power generations. An auspicious way to produce well-controlled structures for applications as anion exchange membrane is using the radiation-induced grafting method (RIG) with RAFT agents [1]. RAFT consists of a reversible addition fragmentation chain transfer of free radicals and allows the control over polymeric molecular weight and copolymer topology and other properties. Ethylene tetrafluoroethylene (ETFE) is a type of fluoropolymer that can be applied in AEM due to its lightweight, excellent chemical and thermodynamic stability, and greater resistance to radiation ageing [2]. In this study, we investigated the beneficial outcomes of performing the ETFE-AEM synthesis in a fully controlled manner by RAFT polymerization using RIG. The influence of RAFT agent on physical (mechanical behavior, dimension), chemical (such as IEC), thermal properties (TGA and DSC) were investigated in detail for future and evaluated in AEMFCs. ETFE-grafting-Vinylbenzyl chloride (VBC) using RAFT agent controlled grafting degree of membrane and improved mechanical properties compared to conventional method of grafting.

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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.