Tailored montmorillonite nanoparticles and their behaviour in the alkaline cement environment

Calabria-Holley, Juliana; Naden, Benjamin J.; Mitchels, John M.; Paine, Kevin

doi:10.1016/j.clay.2017.03.005

Cited by 39 publications

(34 citation statements)

References 14 publications

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“…Of all nanoparticles employed in these studies, the nMt's, which are promising materials for a number of reasons, including the fact that they are naturally occurring, abundant, and cost effective, provided ambiguous results. It was found that their addition at significant concentrations can, indeed, cause a reduction in compressive strength of samples and this was attributed to a number of issues; primarily the modifier and dispersion agent used and the nanostructure of each dispersion itself [19,33], the quantity of nMt addition, and the absence of superplasticizer [1,28]. In summary, results suggest that in ternary (Portland limestone nanocomposites) [32] and quaternary combinations [1] 1% of nMt addition by total weight of the binder is optimal and can offer strength improvements in pastes.…”

Section: Manufacturing and Fabrication Methods Cement MIX Characterizamentioning

confidence: 99%

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

Paine

2019

Applied Sciences

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With the current paper three nano-Montmorillonites (nMt) are applied in cement nanohybrids: an organomodified nMt dispersion, nC2; an inorganic nMt dispersion, nC3; and an organomodified powder, nC4. nC4 is fully characterized in this paper (X-ray diffraction, scanning electron microscopy/X-ray energy dispersive spectroscopy and thermal gravimetric analysis/differential thermogravimetry. Consecutively a ternary non pozzolanic combination of fiber–cement nanohybrids (60% Portland cement (PC) and 40% limestone (LS)) was investigated in terms of flexural strength, thermal properties, density, porosity, and water impermeability. Flexural strength was improved after day 28, particularly with the addition of the inorganic nMt dispersion. There was no change in density or enhancement in pozzolanic reactions for the powder nMt. Mercury intrusion porosimetry showed that the pore related parameters were increased. This can be attributed to mixing effects and the presence of fibers. Water impermeability tests yielded ambiguous results. Clearly, novel manufacturing processes of cement nanohybrids must be developed to eliminate mixing issues recorded in this research.

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Section: Manufacturing and Fabrication Methods Cement MIX Characterizamentioning

confidence: 99%

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

Paine

2019

Applied Sciences

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“…Clay minerals are naturally layered silicate constructions (phyllosilicates) that have crystallized to micro-and nanometer-sized particles. Clay nanoparticles have been used in porous polymer scaffolds to increase compressive strength and stiffness which are vital elements for scaffold design in tissue engineering, especially in bone repair [6,7]. Clay nanoparticles have an important role in the structure to generate strong porous scaffolds with strength and stiffness equivalent to trabecular bone.…”

Section: Introductionmentioning

confidence: 99%

The Comparison between the Osteogenic Differentiation Potential of Clay-Polyacrylonitrile Nanocomposite Scaffold and Graphene-Polyacrylonitrile Scaffold in Human Mesenchymal Stem Cells

Mirakabad¹,

Hosseinzadeh²,

Abbaszadeh³

et al. 2019

Nano BioMed ENG

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Nowadays, bone repair by means of stem cells potential is considered as a new approach in regenerative medicine. Adipose-derived mesenchymal stem cells (AD-MSCs) have been investigated as a plentiful cell source with the ability of osteogenic differentiation which can play an important role in bone tissue engineering applications. Discovering proper elements in combination of scaffolds structure to stimulate osteogenesis in adipose-derived stem cells is one of the major concerns in this issue. Porous polymeric scaffolds such as polyacrylonitrile (PAN) and susceptible nanoparticles have attracted a lot of attention recently due to biodegradability and differentiation potential respectively. In the present study, clay-PAN nanocomposite (CPN) and graphene-PAN scaffold have been electrospuned separately and evaluated from the point of the osteogenic potential in AD-MSCs. The objective of this study was to determine the effect of clay and graphene nanoparticles with PAN nanofibers on the fate of viability and osteogenesis of AD-MSCs. First, isolated mesenchymal cells were characterized by flow cytometry. After cell culture on the surface of scaffolds MTT assay, scanning electron microscope (SEM) and DAPI staining were done. The scaffolds were characterized and osteogenic differentiation potential of AD-MSCs has been investigated. The results have indicated that alkaline phosphatase (ALP) activity, calcium content and collagen expression of cells which cultured on clay-PAN nanofibers were higher than cells which cultured on graphene-PAN scaffold. Taken together, these results suggest that porous nanofiber clay-PAN scaffold can enhance the osteogenic differentiation of AD-MSCs, and can be used as a new biodegradable scaffold for bone tissue engineering applications.

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“…Volume was obtained by water displacement. : (2) Where, m a = the mass of the specimen in air, in kg, m w = the apparent mass of the immersed specimen in water, in kg, = the density of water, at 20 °C, taken as 998 kg/m³.…”

Section: Methods -Characterization Techniques Employedmentioning

confidence: 99%

“…At the same time the emergence of nanotechnology has allowed the formulation of cementitious composites beyond regulatory acceptable limits. Latest findings have ascertained the increase in mechanical strengths and pozzolanic reactivity with the addition of nanoparticles [1], the good affinity of nano-montmorillonite (nMt) particles in pH environments as that of hydrating cement [2] and the overall effect nanotechnology can have on the detection and investigation of cement's binding agent, C-S-H [3]. One of the challenges of this study was to create a Portland-composite binder with high limestone content and lower than the permissible clinker content according to EN 197-1 [4], by adding nanoparticles of montmorillonite.…”

Section: Introductionmentioning

confidence: 99%

Pore-structure and microstructural investigation of organomodified/Inorganic nano-montmorillonite cementitious nanocomposites

Grammatikos

Adl‐Zarrabi

Paine³

2018

AIP Conference Proceedings

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Tailored montmorillonite nanoparticles and their behaviour in the alkaline cement environment

Cited by 39 publications

References 14 publications

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

From Nanostructural Characterization of Nanoparticles to Performance Assessment of Low Clinker Fiber–Cement Nanohybrids

The Comparison between the Osteogenic Differentiation Potential of Clay-Polyacrylonitrile Nanocomposite Scaffold and Graphene-Polyacrylonitrile Scaffold in Human Mesenchymal Stem Cells

Pore-structure and microstructural investigation of organomodified/Inorganic nano-montmorillonite cementitious nanocomposites

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