Elaboration and Structural Investigation of Iron (III)  Phosphate Glasses

Aqdim, Said; Ouchetto, M.

doi:10.4236/ampc.2013.38046

Cited by 23 publications

(15 citation statements)

References 23 publications

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“…However, the possible existence of crystalline phases should not be excluded. 39,40 In agreement with the results of XRD, the FTIR measurements also do not indicate any type of modification in the glass matrix with the addition of silver. Figure 2 shows the FTIR spectra of all samples.…”

Section: Resultssupporting

confidence: 86%

Nontoxic glasses: Preparation, structural, electrical and biological properties

Gavinho

Prezas

Ramos

et al. 2019

Int J Applied Ceramic Tech

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Bacterial infections affect about 1 in 5 patients who receive a dental implant within 5 years of surgery. To avoid the implant rejection it is necessary for the development of innovative biomaterials, with addition or substitution of the ions, for implant coatings that promote a strong bond with the new host bone and antibacterial action. The objective of this work was to synthesize a bioactive glass with different silver concentrations to evaluate their antibacterial performance. The glasses were synthesized with up to 2% silver content by melt‐quenching. Structural, morphological, biological, and electrical properties of all samples were studied. The biological behavior was evaluated through cytotoxicity tests and antibacterial activity. The structural analysis shows that the introduction of silver do not promote significant changes, not altering the advantageous properties of the bioglass of the bioglass. It was verified that the glasses with a silver content from 0.5% to 2%, completely prevented the growth of both Staphylococcus aureus and Escherichia coli while being nontoxic toward mammalian cells. Therefore, these bioglasses are promising materials to be used in the production of dental implants with antimicrobial activity.

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Section: Resultssupporting

confidence: 86%

Nontoxic glasses: Preparation, structural, electrical and biological properties

Gavinho

Prezas

Ramos

et al. 2019

Int J Applied Ceramic Tech

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“…When the CaO content increases in the glass network, we see the disappear of the phase Ca 4 ) for x ≥ 25 mol%, which indicates the change of olygophosphate units in the form, presumably, of cyclic metaphosphate chains that result in agglomerates of crystallites amounting to a few tens of micrometres. These agglomerates lead to a clear improvement in chemical durability [14].…”

Section: Discussionmentioning

confidence: 99%

Chemical Durability and Structural Proprieties of the Vitreous Part of the System xCaO-(40-x)ZnO-15Na2O-45P2O5

Chabbou¹,

Aqdim²

2014

AMPC

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The influence of CaO on the glass forming characteristics and properties of Na2O-CaO-ZnO-P2O5 glasses has been investigated. According to the studies that we performed on phosphate based glass within system xCaO-(40-x)ZnO-15Na2O-45P2O5 (10 ≤ x ≤ 30; mol%), it was found that the increase of CaO and substitution of ZnO can give a good chemical durability. Both Cristallographies X-ray and IR spectroscopy have confirmed the structure change when the CaO content increases in the glass. This change results in the formation of metaphosphate and/or rings of metaphosphate groups at the expense of pyrophosphate. So it indicates the formation of Ca-O-P bonds in the network glass that replaces hydrated P-O-Na and P-O-P bands. The phosphate chains units can be bonded together in rings forming meta-phosphate groups. These rings likely lead to the formation of agglomerates of crystalline phases, which is the main cause of the increase in the chemical durability of the glasses when the CaO content increases. The latter may lead to wider use of these materials, especially in the biomedical field.

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“…On the other hand, phosphate glasses have lower glass transition temperature, higher thermal expansion coefficient and higher transmission in the UV region compared with silicate and borate glasses [2]. It is known that, phosphate glasses represent a dielectric energy-storage material, and therefore, they are useful for fabricating high energy density devices [3].The addition of transition metal oxides, such as Fe2O3, to phosphate glasses makes them more chemical resistive due to the replacing of the easily hydrated P-O-P bonds by the stronger Fe-O-P ones [4]. The effect of ZnO concentration on the dielectric properties of magnesium zinc phosphate glasses has been investigated [5], where the obtained results showed that the dielectric constant and dielectric strength rise with increasing ZnO content due to the increase of the dipole density associated to Zn 2+ ions.…”

Section: Introductionmentioning

confidence: 99%