Structure of bioactive mixed polymer/colloid aerogels

Esquivias, L.; Morales‐Flórez, Víctor; Piñero, Manuel; Rosa–Fox, N. de la

doi:10.1016/j.jnoncrysol.2005.08.007

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…Thus, rupture strains of sample TD0w were found at  = 0.02 for both liquids. Thereby, the Young"s moduli in TD0w were neglected as the sample failed with the previous research in bioactive composite materials based on mineral-organicsilica aerogels [38][39][40][41], in order to establish first steps for developing new exploitable features for biomaterial applications.…”

Section: Structure Of the Wet Samplesmentioning

confidence: 99%

Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels

Morales‐Flórez

Piñero

Braza

et al. 2016

J Sol-Gel Sci Technol

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This work is a new approach to the study of the structural, mechanical and absorption properties of hybrid organic/inorganic silica-based aerogels. Diethoxydimethylsilane and tetraethoxysilane have been used as precursors. Changes in properties such as specific surface area, porous volume, pore radius and surface texture and chemistry were researched as a function of the relative organic content. In addition, the absorption properties were tested for different organic liquids. The discrepancy in the absorption mechanisms and the kinetics of pure inorganic and hybrid samples were discussed. It was confirmed that swelling occurs in samples with high organic content, which, in turn, governs the absorption process. Finally, the mechanical behaviour was studied by uniaxial compression. A significant rise of the rupture strain up to 0.45 and a 10-fold decrease in the Young"s modulus to 7.8 MPa were measured in the dry samples by increasing the organic content. The mechanical response of the samples after saturation by the absorption of two reference oily liquids, namely, common motor oil and liquid PDMS, was also compared with the behaviour of dry samples. The presence of liquid within the sample reduced the value of the mechanical parameters in almost all cases. Moreover, the inclusion of organic chains also made the wet aerogels highly deformable. In summary, our results suggest that tuning the organic ratio of the hybrid aerogels allows the control of not only the structural and mechanical properties but also the absorption properties.

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Section: Structure Of the Wet Samplesmentioning

confidence: 99%

Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels

Morales‐Flórez

Piñero

Braza

et al. 2016

J Sol-Gel Sci Technol

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“…Hasmy has also worked on characterization, studying the behavior of the characteristic cluster size and the influence of the simulation box size [23]. One of the most frequently studied features of porous materials is the pore size distribution (PSD), which is experimentally calculated by several techniques, such as N 2 adsorption or Hg porosimetry [24]. Similarly, the PSD of different porous structural models has been also pursued by several research groups, using different strategies or different concepts for describing a pore [16,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

The cluster model: A hierarchically-ordered assemblage of random-packing spheres for modelling microstructure of porous materials

Morales‐Flórez

Piñero

Rosa–Fox

et al. 2008

Journal of Non-Crystalline Solids

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“…Thus, some strategies have been proposed to bioactivate bioinert materials. For example, Esquivias et al [ 16 , 17 , 18 ] showed that the addition of wollastonite conferred bioactivity to silica aerogels. Moreover, another alternative strategy has been proposed by Almeida et al [ 19 ], who obtained bioactive hybrid materials made of PDMS-SiO 2 -TiO 2 -CaO by the sol-gel process, and the starting sol has been proposed as a coating to confer bioactivity to porous alumina [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Porous Alumina Structures by SPS and Carbon Sacrificial Template for Bone Regeneration

et al. 2022

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In this work, a procedure for fabricating porous alumina with the use of a carbon sacrificial template has been tested in order to optimize the fabrication of porous structures mimicking the porosity and mechanical properties of the human cortical bone. Two different sources of sacrificial carbon were used and compared, and different sintering and calcination routes were considered. The porosity of the alumina structures studied by Hg porosimetry revealed that the amount of porosity and the size and shape of the pores are still below the required values, although some acicular pores were clearly observed by SEM. Moreover, measured mechanical properties (Young’s modulus) remained below that of the bone, suggesting the need for further consolidation treatments. In summary, these encouraging results drive the optimization of future fabrication routes.

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Structure of bioactive mixed polymer/colloid aerogels

Cited by 4 publications

References 21 publications

Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels

Absorption capacity, kinetics and mechanical behaviour in dry and wet states of hydrophobic DEDMS/TEOS-based silica aerogels

The cluster model: A hierarchically-ordered assemblage of random-packing spheres for modelling microstructure of porous materials

Fabrication of Porous Alumina Structures by SPS and Carbon Sacrificial Template for Bone Regeneration

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