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Melamine-formaldehyde microcapsules : micro- and nanostructural characterization with electron microscopy

(2016) MICROSCOPY AND MICROANALYSIS. 22(6). p.1222-1232
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Abstract
A systematic study has been carried out to compare the surface morphology, shell thickness, mechanical properties, and binding behavior of melamine-formaldehyde microcapsules of 5-30 mu m diameter size with various amounts of core content by using scanning and transmission electron microscopy including electron tomography, in situ nanomechanical tensile testing, and electron energy-loss spectroscopy. It is found that porosities are present on the outside surface of the capsule shell, but not on the inner surface of the shell. Nanomechanical tensile tests on the capsule shells reveal that Young's modulus of the shell material is higher than that of bulk melamine-formaldehyde and that the shells exhibit a larger fracture strain compared with the bulk. Core-loss elemental analysis of microcapsules embedded in epoxy indicates that during the curing process, the microcapsule-matrix interface remains uniform and the epoxy matrix penetrates into the surface micro-porosities of the capsule shells.
Keywords
ENCAPSULATION, transmission electron microscopy, melamine formaldehyde, in situ, mechanical TEM, electron tomography, EELS

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Chicago
Heidari, Hamed, Guadalupe Rivero, Hosni Idrissi, Dhanya Ramachandran, Seda Çakır, Ricardo Egoavil, Mert Kurttepeli, et al. 2016. “Melamine-formaldehyde Microcapsules : Micro- and Nanostructural Characterization with Electron Microscopy.” Microscopy and Microanalysis 22 (6): 1222–1232.
APA
Heidari, H., Rivero, G., Idrissi, H., Ramachandran, D., Çakır, S., Egoavil, R., Kurttepeli, M., et al. (2016). Melamine-formaldehyde microcapsules : micro- and nanostructural characterization with electron microscopy. MICROSCOPY AND MICROANALYSIS, 22(6), 1222–1232.
Vancouver
1.
Heidari H, Rivero G, Idrissi H, Ramachandran D, Çakır S, Egoavil R, et al. Melamine-formaldehyde microcapsules : micro- and nanostructural characterization with electron microscopy. MICROSCOPY AND MICROANALYSIS. 2016;22(6):1222–32.
MLA
Heidari, Hamed, Guadalupe Rivero, Hosni Idrissi, et al. “Melamine-formaldehyde Microcapsules : Micro- and Nanostructural Characterization with Electron Microscopy.” MICROSCOPY AND MICROANALYSIS 22.6 (2016): 1222–1232. Print.
@article{8515855,
  abstract     = {A systematic study has been carried out to compare the surface morphology, shell thickness, mechanical properties, and binding behavior of melamine-formaldehyde microcapsules of 5-30 mu m diameter size with various amounts of core content by using scanning and transmission electron microscopy including electron tomography, in situ nanomechanical tensile testing, and electron energy-loss spectroscopy. It is found that porosities are present on the outside surface of the capsule shell, but not on the inner surface of the shell. Nanomechanical tensile tests on the capsule shells reveal that Young's modulus of the shell material is higher than that of bulk melamine-formaldehyde and that the shells exhibit a larger fracture strain compared with the bulk. Core-loss elemental analysis of microcapsules embedded in epoxy indicates that during the curing process, the microcapsule-matrix interface remains uniform and the epoxy matrix penetrates into the surface micro-porosities of the capsule shells.},
  author       = {Heidari, Hamed and Rivero, Guadalupe and Idrissi, Hosni and Ramachandran, Dhanya and \c{C}ak{\i}r, Seda and Egoavil, Ricardo and Kurttepeli, Mert and Crabbe, Amandine C and Hauffman, Tom and Terryn, Herman and Du Prez, Filip and Schryvers, Dominique},
  issn         = {1431-9276},
  journal      = {MICROSCOPY AND MICROANALYSIS},
  language     = {eng},
  number       = {6},
  pages        = {1222--1232},
  title        = {Melamine-formaldehyde microcapsules : micro- and nanostructural characterization with electron microscopy},
  url          = {http://dx.doi.org/10.1017/S1431927616012484},
  volume       = {22},
  year         = {2016},
}

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