|
|
|
|
| |
|
|
| VIANA, L. C.; BOLZON DE MUÑIZ, G. I.; MAGALHAES, W. L. E.; ANDRADE, A. S. de; NIGOSKI, S.; POTULSKI, D. C.. |
| Este trabalho investiga as propriedades físicas e mecânicas de filmes nanoestruturados produzidos a partir da polpa kraft branqueada de Pinus sp. Para obter a nanocelulose, a polpa kraft branqueada foi submetida a seis diferentes intensidades de desfibrilação pelo moinho: dois, cinco, dez, 20, 30 e 40 passes. A influência do número de passes foi avaliada por meio das propriedades físicas e mecânicas dos filmes. Os resultados indicam que a presença de nanofibrilas reduziu a espessura e aumentou consideravelmente os valores de densidade dos filmes fabricados. Observou-se aumento da resistência à tração de 300% e o índice de ruptura foi dez vezes maior em relação aos papéis normais. A estrutura mais compacta e a menor porosidade causada pela maior superfície... |
| Tipo: Artigo de periódico |
Palavras-chave: Nanocelulose; Moinho; Densidade; Índice de cristalinidade; Nanocellulose; Grinder; Crystallinity index; Propriedade Mecânica; Pinus; Mechanical properties; Density. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1111655 |
| |
|
|
| El-Gamal,Rehab; Nikolaivits,Efstratios; Zervakis,Georgios I; Abdel-Maksoud,Gomaa; Topakas,Evangelos; Christakopoulos,Paul. |
| Background: Many buildings in Egypt e.g. museums, mosques and churches, do not possess controlled environments for minimizing the risks of damage of wooden artifacts due to the growth of fungi. Fungal damage usually appears as change in wood color, appearance of stains, and sometimes deformation of wooden surfaces. In this study we focused on the effect that some fungi exert on the properties of wooden artifacts and evaluated the effectiveness of different concentrations of chitosan on their protection against damage by mold fungi. Results: Samples were collected from different monuments and environments, and fungi growing on them were isolated and identified. The isolated Penicillium chrysogenum, Aspergillus flavus and /Aspergillus niger strains were used... |
| Tipo: Journal article |
Palavras-chave: Archeological wood; Chitosan protection; Crystallinity index; Damage of wooden artifacts; Filamentous fungi; FTIR; Fungal damage; Prevention of fungal growth; UV spectrophotometry; Wood deterioration; XRD. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600011 |
| |
|
|
| Wang, Ke; Tada, Ryuji; Zheng, Hongbo; Irino, Tomohisa; Zhou, Bin; Saito, Keita. |
| The inner shelf sediments of the East China Sea (ECS) preserve valuable information regarding climatic changes on land through detrital material discharged from large rivers, particularly the Yangtze River. In this paper, we examine the provenance changes of fine-grained detrital quartz preserved in the sediment of the MD06-3040 core retrieved from the mud belt on the inner shelf of the ECS during the last 6 kyrs. The provenance of the fine silt fraction (4–16 μm) of the sediments, which is considered to represent the suspended particulate matter (SPM) from the Yangtze River, is estimated based on the electron spin resonance (ESR) signal intensity and crystallinity index (CI) of quartz. By comparing the ESR signal intensity and CI of quartz in the fine... |
| Tipo: Text |
Palavras-chave: Electron spin resonance; Crystallinity index; East Asian summer monsoon; The Yangtze River drainage; The East China Sea. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00607/71886/70584.pdf |
| |
|
|
|
