Cellulose nanowhisker foams by freeze casting

Dash, Rajalaxmi; Yang, Li; Ragauskas, Arthur J.

doi:10.1016/j.carbpol.2011.12.035

Cited by 130 publications

(88 citation statements)

References 27 publications

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“…The PVA is proved to inhibit the recrystallization and is a suitable polymer to preserve the food items at low temperature, which controls the ice nucleation (Budke and Koop, 2006;Pekor, Groth, & Nettleship, 2010). In general the cellulose scaffolds possess collapsed porous structure on freeze drying and addition of PVA modifies the mor-phology of the cellulose scaffolds due to the control of nucleation (Dash, Li, & Ragauskas, 2012). The lamellar morphology of the cel-lulose scaffolds in pristine clearly evidences that PVA plays an important role in the formation of lamellar/fibrous morphology.…”

Section: Results and Discussion 31 Scanning Electron Microscopymentioning

confidence: 99%

Surface stiffening and enhanced photoluminescence of ion implanted cellulose – polyvinyl alcohol – silica composite

Shanthini

Sakthivel

Menon

et al. 2016

Carbohydrate Polymers

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Novel Cellulose (Cel) reinforced polyvinyl alcohol (PVA)-Silica (Si) composite which has good stability and in vitro degradation was prepared by lyophilization technique and implanted using N 3+ ions of energy 24 keV in the fluences of 1 × 10 15 , 5 × 10 15 and 1 × 10 16 ions/cm 2 . SEM analysis revealed the formation of microstructures, and improved the surface roughness on ion implantation. In addition to these structural changes, the implantation significantly modified the luminescent, thermal and mechanical properties of the samples. The elastic modulus of the implanted samples has increased by about 50 times compared to the pristine which confirms that the stiffness of the sample surface has increased remarkably on ion implantation. The photoluminescence of the native cellulose has improved greatly due to defect site, dangling bonds and hydrogen passivation. Electric conductivity of the ion implanted samples was improved by about 25%. Hence, low energy ion implantation tunes the mechanical property, surface roughness and further induces the formation of nano structures. MG63 cells seeded onto the scaffolds reveals that with the increase in implantation fluence, the cell attachment, viability and proliferation have improved greatly compared to pristine. The enhancement of cell growth of about 59% was observed in the implanted samples compared to pristine. These properties will enable the scaffolds to be ideal for bone tissue engineering and imaging applications.

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Section: Results and Discussion 31 Scanning Electron Microscopymentioning

confidence: 99%

Surface stiffening and enhanced photoluminescence of ion implanted cellulose – polyvinyl alcohol – silica composite

Shanthini

Sakthivel

Menon

et al. 2016

Carbohydrate Polymers

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“…The resulting structure comprises thus just two populations of macropores ( Figure 3B), created respectively by the large ice crystals and the packing of particles. The final materials comprise polycrystalline platelets of large dimensions (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) µm in thickness, and hundreds of microns in length and width).…”

Section: Resultsmentioning

confidence: 99%

Crystal Templating with Mutually Miscible Solvents: A Simple Path to Hierarchical Porosity

2014

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Abstract:Ice templating, a route where ice crystals are used to template macroporosity, has been used to process a variety of materials with one level of macropores. We demonstrate here a variant of ice templating based on the solidification of mutually miscible solvents. The solidification of different phases, each defined by their own size and morphology, provides a simple one-step processing route for materials with hierarchical porosity defined by up to three levels of macroporosity. These concepts are demonstrated with both ceramic (yttria-stabilized zirconia) and polymer (polyvinyl alcohol) materials.

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“…The first idea is to use anisotropic objects such as platelets or fibers. If properly controlled, the freeze front can align and orient the anisotropic objects, and thus induce preferential orientations in the structure [28,29], but also create lightweight, percolating fiber scaffolds (SiC, cellulose) [30,31]. The alignment of objects can be used later to obtain specific morphologies and thus microstructures [32] and improves structural or functional properties.…”

Section: Self-organisation Self-assemblymentioning

confidence: 99%

The lure of ice-templating: Recent trends and opportunities for porous materials

Deville

2018

Scripta Materialia

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Ice-templating is a simple materials processing and shaping route where the growth of crystals from a solvent template the porosity. Although the principles of ice-templating were established a long time ago, it has lured considerable attention over the past 5 years to become a well-established processing route for porous materials of all kinds. In this viewpoint, I summarize the current status and recent trends of ice-templating studies. I then review the unique assets of ice-templating and propose a roadmap of the most promising or pressing questions and opportunities in this domain.

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Cellulose nanowhisker foams by freeze casting

Cited by 130 publications

References 27 publications

Surface stiffening and enhanced photoluminescence of ion implanted cellulose – polyvinyl alcohol – silica composite

Surface stiffening and enhanced photoluminescence of ion implanted cellulose – polyvinyl alcohol – silica composite

Crystal Templating with Mutually Miscible Solvents: A Simple Path to Hierarchical Porosity

The lure of ice-templating: Recent trends and opportunities for porous materials

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