<i>SAXSMorph</i>: a program for generating representative morphologies for two-phase materials from small-angle X-ray and neutron scattering data

Ingham, Bridget; Li, Haiyong; Allen, Emily; Toney, Michael F.

doi:10.1107/s0021889810048557

Cited by 10 publications

(14 citation statements)

References 9 publications

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“…As the hard segment content increases, AFM images reveal an increase on the hard domain connectivity and the formation of large structures. [44,46,47] It has previously been reported [42,46] that larger structures are aggregates of smaller hard domains. The AFM images showed an estimated interdomain spacing of 10-12 nm.…”

Section: Resultsmentioning

confidence: 96%

“…[41] This model-independent approach provides representative 3D structures corresponding to the experimental scattering data. [42] Figure 6 shows the evolution of the morphologies (HS are represented as solid) at 250 sec and 1500 sec for PU-25% HS and PU-32.5% HS nanocomposite foams, respectively. (Detailed explanation of the analysis approach is provided in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of hard segment content and carbon-based nanostructures on the kinetics of flexible polyurethane nanocomposite foams

Bernal

Martin-Gallego

Romasanta

et al. 2012

Polymer

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Effect of hard segment content and carbon-based nanostructures on the kinetics of flexible polyurethane nanocomposite foams

Bernal

Martin-Gallego

Romasanta

et al. 2012

Polymer

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“…SAXSMorph 56 was used to generate three-dimensional representations (cubes) of structures for the samples featured in Figure 4 using known pore fractions and SAXS profiles (see Section 4.4.1). Because the infinite number of structures provides the same SAXS profile, representations produced through SAXSMorph are potential microstructures and are not guaranteed to match the real structure.…”

Section: Methodsmentioning

confidence: 99%

Sol–Gel Synthesis and Characterization of Gels with Compositions Relevant to Hydrated Glass Alteration Layers

2019

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During the processes associated with glass corrosion, porous hydrated glass alteration layers typically form upon exposure to aqueous conditions for extended time periods. The impacts of the alteration layer on glass durability have not been agreed upon in the glass science community. In particular, the formation mechanisms of hydrated glass alteration layers are still largely unknown and require further investigation, but these layers often require months to years to develop and are often too thin to adequately characterize. Meanwhile, sol–gel-derived silicate gels are relatively easy to synthesize in bulk with custom compositions relevant to hydrated glass alteration layers. If alteration layers and synthetic silicate gels demonstrate physical and chemical properties that are sufficiently similar, synthetic silicate gels could be used as analogues for hydrated glass alteration layers in future studies. However, synthetic gels must first be prepared and evaluated before comparisons between glass alteration layers and synthetic silicate gels can be made. This work focuses entirely on the synthesis and observed physical properties of synthetic silicate gels. A future work will compare the characteristics of synthetic gels described in this work with altered waste glass formed in similar pH environments. In this study, synthetic gels were made with custom compositions at various pH values to evaluate the effect of pH on gel structure and morphology. Several other variables were examined also, such as composition, drying, and aging. Gels were produced by sequential additions of organometallic precursors in a single container. Gels were analyzed with several techniques including small-angle X-ray scattering, gas adsorption, and He pycnometry to determine the effects of the variables on physical properties. Results show that gels prepared at pH 3 consistently contained fewer primary particles with diameters larger than 7.2 nm and fewer pores with diameters larger than 30 nm compared to gels synthesized at pH 7 and 9. Composition was shown to have no discernable effect on primary particle and pore sizes at any pH.

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“…We have also explored three‐dimensional morphology of mixed oligopeptide‐polysaccharide hydrogels using the program SAXSMorph 28. Two‐dimensional slices of the hydrogel bulks created by SAXSMorph were then analyzed using the NIH image analysis program ImageJ (see Supporting Information) 29…”

Section: Methodsmentioning

confidence: 99%

Viscoelastic properties and nanoscale structures of composite oligopeptide‐polysaccharide hydrogels

Hyland¹,

Taraban²,

Feng³

et al. 2011

Biopolymers

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Biocompatible and biodegradable peptide hydrogels are drawing increasing attention as prospective materials for human soft tissue repair and replacement. To improve the rather unfavorable mechanical properties of our pure peptide hydrogels, in this work we examined the possibility of creating a double hydrogel network. This network was created by means of the co-assembly of mutually attractive but self-repulsive oligopeptides within an already existing fibrous network formed by the charged, biocompatible polysaccharides chitosan, alginate, and chondroitin. Using dynamic oscillatory rheology experiments, it was found that the co-assembly of the peptides within the existing polysaccharide network resulted in a less stiff material as compared to the pure peptide networks (the elastic modulus G′ decreased from 90 kPa to 10 kPa). However, these composite oligopeptide-polysaccharide hydrogels were characterized by a greater resistance to deformation (the yield strain γ grew from 4 % to 100 %). Small-angle neutron scattering (SANS) was used to study the 2D cross-sectional shapes of the fibers, their dimensional characteristics and the mesh sizes of the fibrous networks. Differences in material structures found with SANS experiments confirmed rheology data showing that incorporation of the peptides dramatically changed the morphology of the polysaccharide network. The resulting fibers were structurally very similar to those forming the pure peptide networks, but formedless stiff gels because of their markedly greater mesh sizes. Together, these findings suggest an approach for the development of highly deformation-resistant biomaterials.

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SAXSMorph: a program for generating representative morphologies for two-phase materials from small-angle X-ray and neutron scattering data

Cited by 10 publications

References 9 publications

Effect of hard segment content and carbon-based nanostructures on the kinetics of flexible polyurethane nanocomposite foams

Effect of hard segment content and carbon-based nanostructures on the kinetics of flexible polyurethane nanocomposite foams

Sol–Gel Synthesis and Characterization of Gels with Compositions Relevant to Hydrated Glass Alteration Layers

Viscoelastic properties and nanoscale structures of composite oligopeptide‐polysaccharide hydrogels

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