@article{fdi:010042791,
  title = {{F}ractal structure in natural gels : effect on carbon sequestration in volcanic soils},
  author = {{C}hevallier, {T}iphaine and {W}oignier, {T}. and {T}oucet, {J}o{\¨e}le and {B}lanchart, {E}ric and {D}ieudonn{\'e}, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}llophanic soils are interesting in terms of environmental properties especially because of their potentialities as sinks for "greenhouse gases" by the way of {C} sequestration. {T}hese volcanic soils contain amorphous clays (allophanes) and exhibit higher organic carbon content than the one measured in other clay soils. {W}e measured the {C} content of a set of allophanic soils and showed that the {C} content is positively correlated to the allophane content. {W}e also measured the part of organic matter transformed into {CO}2 during a respiration experiment and showed that the decomposition is lowered as the soils allophane content increases. {A}llophane aggregates are very close to the synthetic gels: high specific surface area large pore volume, fractal structure, large water content and important irreversible shrinkage during drying. {I}n this work we characterized by {S}mall {A}ngle {X}-{R}ay {S}cattering ({SAXS}) the fractal structure of the allophane aggregates at the nano scale. {W}e hypothesized that the peculiar structure and the associated low accessibility of the allophanic soils could explain the high organic carbon content and the associated poor transformation into {CO}2. {T}he tortuous structure of the allophane aggregates plays the role of a labyrinth which fix and traps soil organic carbon.},
  keywords = {{N}atural gel ; {A}llophane ; {F}ractal materials ; {C} sequestration ; {P}ermeability ; {D}iffusion coefficient},
  booktitle = {},
  journal = {{J}ournal of {S}ol-{G}el {S}cience and {T}echnology},
  volume = {48},
  numero = {1-2},
  pages = {231--238},
  ISSN = {0928-0707},
  year = {2008},
  DOI = {10.1007/s10971-008-1795-z},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042791},
}