Bioactivity of quaternary glass prepared from bentonite clay

Adams, Luqman A.; Essien, Enobong R.

doi:10.1007/s40145-015-0172-y

“…Bentonite clay, in particular (Na,Ca)(Al,Mg) 6 (Si 4 O 10 ) 3 (OH) 6 .nH 2 O, is a naturally occurring sedimentary clay with the 3-layered clay structure formed from the weathering of volcanic ash. Recently, bentonite has been shown to be a promising source of silica in bioactive glass production [15]. In that report, the glass formed exhibited textural parameters containing sub-micron sized particles and large surface area desirable for in vivo biological applications.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Mechanical and Bioactivity Assessment of Wollastonite/PVA Composite Synthesized from Bentonite Clay

Adams

¹

,

Essien

²

,

Kaufmann

³

2019

Glass Phys Chem

0

1

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Glass/polymer composites can mimic the natural structure of bone by possessing a fiber-matrix configuration which provides appropriate physical and biological properties. Wollastonite ceramics are known for their promising bioactivity and biocompatibility when applied in bone regeneration. Polyvinyl alcohol (PVA) has various attractive properties including biocompatibility and degradability which may be exploited as a polymer matrix in composites for biomedical applications. Therefore, a cost-effective method of preparing wollastonite/PVA composites is desirable by starting from bentonite clay as a silica source for the glass, instead of traditional alkoxysilanes. The composite prepared was characterized by mechanical testing, scanning electron microscopy, X-ray diffractometry and Fourier-transform infrared spectroscopy to evaluate its compressive strength, morphology, phase composition and bioactivity, respectively. Results obtained revealed for the composite a compressive strength of 0.3 MPa, the ability to induce apatite on its surface when immersed in a simulated body fluid for 7 days and desirable controlled degradation. Hence, this method can be up-scaled for preparation of wollastonite/PVA composite commercially for possible use in bone regeneration.

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“…Panday and Ramontja [12] list in detail the most recent progress in the use of bentonite and its compounds to eliminate contaminating synthetic dyes in water. Luqman and Enobong [13] used bentonite as a base to prepare sol-gel to obtain bioactive glass, significantly lowering the costs generated using old precursors to alkoxysilane. Aravindhraj and Sapna [14] were able to raise the resistance to compression and flection of concrete, mortars and cements, substituting the cement for bentonite in 15%, which also made it exceptionally durable against the effects of sulphate and chlorides.…”

Section: Introductionmentioning

confidence: 99%

Bentonites in Southern Spain. Characterization and Applications

Costafreda¹,

Martín²

2021

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The objective of this work was to investigate and demonstrate the pozzolanic properties of the bentonites found at the San José–Los Escullos deposit, located in the southeast of the Iberian Peninsula, to be used in the manufacturing of more durable and environmentally compatible pozzolanic cements, mortars and concretes. These bentonites are mainly composed of smectites, with montmorillonite as the main clay mineral. They were formed by the hydrothermal alteration of tuffs, volcanic glasses, dacites, rhyolites and andesites. For this research, samples were taken from outcrops on the south, north and west side of the San José–Los Escullos deposit, and in the Los Trancos deposit located 19.3 km to the northeast. All samples consisted of bentonites, except for a zeolite sample taken from the northern flank of the San José–Los Escullos deposit, which was used to contrast and compare the behaviour of bentonite in some of the analyses that were done. An investigation of the mineralogical, petrological, chemical and thermogravimetric characteristics of the samples was carried out using various methods, such as XRD, OA (Oriented aggregates), TGA, XRF, SEM and thin section petrography (TSP). In addition, a chemical analysis of pozzolanicity (CAP) was done at 8 and 15 days to determine the pozzolanic capacity of the samples. XRD, XRF, SEM and TSP studies showed that these bentonites have a complex mineralogical constitution, composed mainly of smectites of the montmorillonite variety, as well as halloysite, illite, vermiculite, biotite, muscovite, kaolinite, chlorite, mordenite, feldspar, pyroxene, amphibole, calcite, volcanic glass and quartz. Thermogravimetric analysis (TGA) established the thermal stability of the bentonites studied at above 800 °C. Chemical analysis of pozzolanicity (CAP) confirmed the pozzolanic character of the bentonites, exhibited in their reactive behaviour with Ca(OH)2. The pozzolanic reactivity increased significantly from 8 to 15 days. These results show that the materials studied can be used as quality pozzolans for the manufacture of pozzolanic cements, mortars and concretes.

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“…Bentonite clay, in particular (Na,Ca)(Al,Mg) 6 (Si 4 O 10 ) 3 (OH) 6 .nH 2 O, is a naturally occurring sedimentary clay with the 3-layered clay structure formed from the weathering of volcanic ash. Recently, bentonite has been shown to be a promising source of silica in bioactive glass production [15]. In that report, the glass formed exhibited textural parameters containing sub-micron sized particles and large surface area desirable for in vivo biological applications.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and bioactivity assessment of wollastonite/PVA composite synthesized from bentonite clay

Adams

¹

,

Essien

²

,

Kaufmann

³

2019

View full text Add to dashboard Cite

Glass/polymer composites can mimic the natural structure of bone by possessing a fiber-matrix configuration which provides appropriate physical and biological properties. Wollastonite ceramics are known for their promising bioactivity and biocompatibility when applied in bone regeneration. Polyvinyl alcohol (PVA) has various attractive properties including biocompatibility and degradability which may be exploited as a polymer matrix in composites for biomedical applications. Therefore, a cost-effective method of preparing wollastonite/PVA composites is desirable by starting from bentonite clay as a silica source for the glass, instead of traditional alkoxysilanes. The composite prepared was characterized by mechanical testing, scanning electron microscopy, X-ray diffractometry and Fourier-transform infrared spectroscopy to evaluate its compressive strength, morphology, phase composition and bioactivity, respectively. Results obtained revealed for the composite a compressive strength of 0.3 MPa, the ability to induce apatite on its surface when immersed in a simulated body fluid for 7 days and desirable controlled degradation. Hence, this method can be up-scaled for preparation of wollastonite/PVA composite commercially for possible use in bone regeneration.

show abstract

Bioactivity of quaternary glass prepared from bentonite clay

Cited by 10 publications

References 39 publications

RETRACTED ARTICLE: Mechanical and Bioactivity Assessment of Wollastonite/PVA Composite Synthesized from Bentonite Clay

RETRACTED ARTICLE: Mechanical and Bioactivity Assessment of Wollastonite/PVA Composite Synthesized from Bentonite Clay

Bentonites in Southern Spain. Characterization and Applications

Mechanical and bioactivity assessment of wollastonite/PVA composite synthesized from bentonite clay

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