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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
25/04/2003 |
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Data da última atualização: |
22/07/2010 |
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Autoria: |
MATTOSO, L. H. C.; RIUL JR. A.; HERRMANN, P. S. P.; BERNARDES FILHO, R. |
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Afiliação: |
Embrapa Instrumentação Agropecuária, São Carlos, SP. |
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Título: |
Use of atomic force microscopy for the study of polymers. |
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Ano de publicação: |
2003 |
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Fonte/Imprenta: |
Acta Microscopica, Maracaibo, v.12, 2003. Supplement A |
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Idioma: |
Inglês |
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Notas: |
CD de trabalhos e resumos apresentados no Second Latin American Symposium on Scanning Microscopy, Búzios, Apr. 2003. 1 f. 1 CD-ROM. |
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Conteúdo: |
Atomic force microscopy (AFM) and other scanning probe microscopy (SPM) techniques are receiving a great attention in the last years due to their enormous potential of investigation of materials at the nanoscale. They posses several advantages over the common electon microscopy techniques for the study of materials such as greater resolution, surface properties such as stiffness, hardness, adhesion, etc, can be evaluated, measurements can be taken inside solutions, assessment of chemical interactions between samples and tips modified with different chemical species, etc. For instance, atomic force microscopy can be successfully used to study the morphology, quantify the roughness and chek microscopically several other surface properties. The aim of this presentation is to provide some insight on the use of AFM technique as a tool for the study of conducting polymers blends, self-assembled and nanostructured thin films for sensor applications and natural fibers and their modification by benzylation and plasma tretment. The morphology and roughness of these materials can be significantly modified as a function of the surface tratment used, as shown by AFM, which presented to be a prowerful tool for studying different types of polymers. |
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Palavras-Chave: |
Microscopia de força atômica; Polímero; Técnicas de microscopia. |
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Thesaurus Nal: |
atomic force microscopy. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01996naa a2200217 a 4500
001 1024688
005 2010-07-22
008 2003 bl uuuu u00u1 u #d
100 1 $aMATTOSO, L. H. C.
245 $aUse of atomic force microscopy for the study of polymers.
260 $c2003
500 $aCD de trabalhos e resumos apresentados no Second Latin American Symposium on Scanning Microscopy, Búzios, Apr. 2003. 1 f. 1 CD-ROM.
520 $aAtomic force microscopy (AFM) and other scanning probe microscopy (SPM) techniques are receiving a great attention in the last years due to their enormous potential of investigation of materials at the nanoscale. They posses several advantages over the common electon microscopy techniques for the study of materials such as greater resolution, surface properties such as stiffness, hardness, adhesion, etc, can be evaluated, measurements can be taken inside solutions, assessment of chemical interactions between samples and tips modified with different chemical species, etc. For instance, atomic force microscopy can be successfully used to study the morphology, quantify the roughness and chek microscopically several other surface properties. The aim of this presentation is to provide some insight on the use of AFM technique as a tool for the study of conducting polymers blends, self-assembled and nanostructured thin films for sensor applications and natural fibers and their modification by benzylation and plasma tretment. The morphology and roughness of these materials can be significantly modified as a function of the surface tratment used, as shown by AFM, which presented to be a prowerful tool for studying different types of polymers.
650 $aatomic force microscopy
653 $aMicroscopia de força atômica
653 $aPolímero
653 $aTécnicas de microscopia
700 1 $aRIUL JR. A.
700 1 $aHERRMANN, P. S. P.
700 1 $aBERNARDES FILHO, R.
773 $tActa Microscopica, Maracaibo$gv.12, 2003. Supplement A
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
29/12/2022 |
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Data da última atualização: |
22/01/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
REIS, C. A.; GUIMARÃES JÚNIOR, M.; MOREIRA, F. K. V.; MARCONCINI, J. M.; VAZ, L. E. V. S. B. |
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Afiliação: |
JOSE MANOEL MARCONCINI, CNPDIA. |
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Título: |
Synthesis and characterization of chitosan/montmorillonite nanocomposites for application as edible coating. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Food Science and Technology International, v. 29, n. 1, 2022. |
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Páginas: |
25 - 39 |
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ISSN: |
1082-0132 |
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DOI: |
10.1177/10820132211057718 |
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Idioma: |
Inglês |
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Conteúdo: |
Edible coating can improve fruits shelf life and, consequently, reduce their waste. Chitosan, which presents a potential for chemical modifications and capacity to form films, can be an alternative for coating due to its biocompatibility, biodegradability, and antimicrobial properties. Chitosan film can be obtained through casting method presenting suitable mechanical properties, such as resistance to traction and elongation, ability to adhere to surfaces and selective permeability to gases, such as O2 and CO2. However, it is highly permeable to water vapor, which can limit its potential coating use. The properties of chitosan films can be improved through the formation of composites by inserting nanoclays as montmorillonite in the polymeric matrix. The objective of this study was to develop and characterize chitosan/montmorillonite nanocomposites for fruit coating aiming for future applications in the field of smart packaging. Nanocomposites were characterized by its microstructure, thermal, mechanical, and physicochemical properties. X-ray diffraction analysis indicated changes in crystallinity with the insertion of montmorillonite. Nanocomposites became more transparent and significantly reduced its water permeability rate with 0.5% w/w montmorillonite addition. Elastic rigidity and tensile strength of the films were improved.Chitosan/montmorillonite nanocomposites demonstrated the potential to improve the storage time ofWilliams pears. |
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Palavras-Chave: |
Biopolymer; Nanoclay. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1150487/1/P-Synthesis-and-characterization-of-chitosan.pdf
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Marc: |
LEADER 02169naa a2200229 a 4500
001 2150487
005 2024-01-22
008 2022 bl uuuu u00u1 u #d
022 $a1082-0132
024 7 $a10.1177/10820132211057718$2DOI
100 1 $aREIS, C. A.
245 $aSynthesis and characterization of chitosan/montmorillonite nanocomposites for application as edible coating.$h[electronic resource]
260 $c2022
300 $a25 - 39
520 $aEdible coating can improve fruits shelf life and, consequently, reduce their waste. Chitosan, which presents a potential for chemical modifications and capacity to form films, can be an alternative for coating due to its biocompatibility, biodegradability, and antimicrobial properties. Chitosan film can be obtained through casting method presenting suitable mechanical properties, such as resistance to traction and elongation, ability to adhere to surfaces and selective permeability to gases, such as O2 and CO2. However, it is highly permeable to water vapor, which can limit its potential coating use. The properties of chitosan films can be improved through the formation of composites by inserting nanoclays as montmorillonite in the polymeric matrix. The objective of this study was to develop and characterize chitosan/montmorillonite nanocomposites for fruit coating aiming for future applications in the field of smart packaging. Nanocomposites were characterized by its microstructure, thermal, mechanical, and physicochemical properties. X-ray diffraction analysis indicated changes in crystallinity with the insertion of montmorillonite. Nanocomposites became more transparent and significantly reduced its water permeability rate with 0.5% w/w montmorillonite addition. Elastic rigidity and tensile strength of the films were improved.Chitosan/montmorillonite nanocomposites demonstrated the potential to improve the storage time ofWilliams pears.
653 $aBiopolymer
653 $aNanoclay
700 1 $aGUIMARÃES JÚNIOR, M.
700 1 $aMOREIRA, F. K. V.
700 1 $aMARCONCINI, J. M.
700 1 $aVAZ, L. E. V. S. B.
773 $tFood Science and Technology International$gv. 29, n. 1, 2022.
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