Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Freeze-dried macroporous foam prepared from chitosan/xanthan gum/montmorillonite nanocomposites

    Access Status
    Fulltext not available
    Authors
    Liu, Huihua
    Nakagawa, K.
    Chaudhary, Deeptangshu
    Asakuma, Y.
    Tade, Moses
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Liu, Huihua and Nakagawa, Kyuya and Chaudhary, Deeptangshu and Asakuma, Yusuke and Tade, Moses O. 2011. Freeze-dried macroporous foam prepared from chitosan/xanthan gum/montmorillonite nanocomposites. Chemical Engineering Research and Design. 89: pp. 2356-2364.
    Source Title
    Chemical Engineering Research and Design
    DOI
    10.1016/j.cherd.2011.02.023
    ISSN
    02638762
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/29441
    Collection
    • Curtin Research Publications
    Abstract

    Freeze-dried macroporous foams were prepared from an aqueous colloidal suspension of chitosan/xanthangum/Na+-montmorillonite nanoclay (MMT). The suspension formed gel structure as a consequence of freezing, named cryogel. Cryogel is defined as a gel formed due to the concentration increase of the substrates caused by the ice formation during freezing. This obtained cryogel was subsequently dried under vacuum condition to produce porous foam materials. Two freezing methods were employed in the present work in order to investigate the influence of the processing on sample characteristics, namely; contact freezing with a heat exchanger and immersion freezing in a cryo-bath. Based on the SEM observation, in the case of contact freezing; rapid freezing (−2 C/min) resulted in randomly aligned pores as compared to the pore alignment obtained in the case of slow freezing (−0.25 C/min); the mean pore size for rapid freezing and slowing freezing were 40 μm and 68 μm, respectively. However, in immersion freezing samples, aligned and bamboo-like straight structures with pore layer spacing of 22 μm were observed. The different microstructures significantly influenced the mechanical hardness of the prepared foams nanocomposites. The MMT dispersion within the bionanocomposites was found to be characteristically exfoliated from X-ray diffraction and electron microscopy analysis. Small angle X-ray diffraction data indicated that the polymeric networks were modified by the exfoliated MMT and the MMT also improved the hardness of the prepared foams.

    Related items

    Showing items related by title, author, creator and subject.

    • Investigation of the production and mechanical properties of porous Beta Titanium alloy compacts prepared by powder metallurgy processes for biomedical applications
      Nugroho, Aris Widyo (2013)
      Titanium and its alloys are known to be widely used for biomedical applications due to their biocompatibility, and excellent corrosion resistance. The introduction of porosity into the metals may reduce the stiffness to ...
    • Processing and properties of porous Ti-Nb-Ta-Zr alloy for biomedical applications using the powder metallurgy route
      Nugroho, Aris; Leadbeater, Garry; Davies, Ian (2011)
      Titanium alloys, due to their biocompatibility and low stiffness, are among the most studied of metallic implant materials. Whereas most titanium-based biomaterials are produced from prealloyed powders, in this work the ...
    • Activated carbon monoliths with hierarchical pore structure from tar pitch and coal powder for the adsorption of CO2, CH4 and N2
      Arami-Niya, Arash ; Rufford, T.E.; Zhu, Z. (2016)
      Activated carbon monoliths with hierarchical pore structures were prepared from petroleum tar pitch and powdered coal in a low pressure foaming process with potassium hydroxide activation. The effects of coal to tar pitch ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.