MAS-NMR studies of geopolymers heat-treated for applications in biomaterials field

Oudadesse, Hassane; Derrien, A. C.; Lefloch, M.; Davidovits, Joseph

doi:10.1007/s10853-006-0524-7

Cited by 64 publications

(44 citation statements)

References 16 publications

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“…This can be explained by the increase of the silica content due to the addition of glass. In the literature [10], indeed, it is reported that geopolymer with a high Si/Al content releases a lower content of Al.…”

Section: Resultsmentioning

confidence: 96%

“…The exposure to GVBa does not affect cell proliferation as well as pure VBa. Moreover, GVBa shows also lower toxicity than the pure geopolymer, because the addition of glass to the geopolymeric matrix causes the increase of the Si/Al ratio in GVBa compared to pure GP, which leads to a decrease in the Al release [10].…”

Section: Resultsmentioning

confidence: 99%

“…In the literature, no specific studies on the cytotoxicity of geopolymers containing waste were found; authors are aware of papers published only on cement for dental application [5,6], glasses [7], materials for shore protection [8], and traditional building materials [9]. Moreover, some studies [10,11] are reported which evaluate the potential application of geopolymers in the biomedical field. However, their clinical use is hindered by Al release.…”

Section: Introductionmentioning

confidence: 99%

“…However, metals ion toxicity is concentration-dependent [12]. Therefore, to reduce Al release, the use of raw materials with ratio of Si/Al = 31 was successfully proposed [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Addition of WEEE Glass to Metakaolin-Based Geopolymeric Binder: A Cytotoxicity Study

2017

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Waste Electrical and Electronic Equipment (WEEE) types of glass, including Cathode Ray Tube (CRT) glass, are now separately collected in European Union 28 (EU28) zone. Due to the high level of Pb and Ba in their compositions, this type of waste finds its way to the disposal. In the present research, a geopolymer matrix based on metakaolin is used to blend in fine powder panel and funnel glass from personal computer (PC) and television (TV) monitors. Such waste glass, which cannot be directed to glass melting furnaces, is safely incorporated into a geopolymer matrix. The consolidation of the geopolymeric matrix containing the waste glass was followed by pH and conductibility up to 28 days of curing. Scanning electron microscope equipped with energy dispersive spectroscopy (SEM/EDS) was used to obtain information on the microstructure of the consolidated products. Cytotoxicity tests helped the environmental evaluation of these materials.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…However, metals ion toxicity is concentration-dependent [12]. Therefore, to reduce Al release, the use of raw materials with ratio of Si/Al = 31 was successfully proposed [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Addition of WEEE Glass to Metakaolin-Based Geopolymeric Binder: A Cytotoxicity Study

2017

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“…For implant applications 24 , geopolymers have been shown to be bioactive with low ion leakage, although the possible leaching of aluminium can result in toxicity 21 . Kaolinite, a good source material for making geopolymers, has been extensively used as a pharmaceutical excipient.…”

Section: Introductionmentioning

confidence: 99%

Bioactivity enhancement of calcined kaolin geopolymer with CaCl2 treatment

Pangdaeng¹,

Sata²,

Aguiar³

et al. 2016

ScienceAsia

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This paper reports that surface treatment with CaCl 2 enhances the bioactivity of a calcined kaolin geopolymer. Calcined kaolin, NaOH solution, sodium silicate solution, and heat curing were used to form geopolymer pastes. A soaked-treatment method was applied to the geopolymer samples using CaCl 2 solution as the ion exchange agent. The bioactivity of the material was determined by the simulated body fluid (SBF) in vitro testing method. Scanning electron microscope images showed a dense apatite formation on the treated geopolymer surface after SBF immersion for only 3 days. The CaCl 2 treatment promoted compressive strength and enhanced bioactivity by accelerating apatite precipitation and slowing down the rise in pH.

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Inorganic Polymers (Geopolymers)

MacKenzie

2017

Encyclopedia of Polymer Science and Technology

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Geopolymers are ceramic-like inorganic polymers produced at low temperature, generally below 100 °C. They consist of chains or networks of mineral molecules linked with covalent bonds. The raw materials are mainly minerals of geological origin, hence the name "geopolymer". They comprise several molecular units for example: silico-oxide (Na,K)-(-Si-O-Si-O-) for (Na,K)-poly(silicate) or (Na,K)-poly(siloxonate), silico-aluminate (Na,K)-(-Si-O-Al-O) for (Na,K)poly(sialate), ferro-silico-aluminate (Na,K)-(-Fe-O-Si-O-Al-O-) or (Na,K)-poly(ferro-sialate), alumino-phosphate (-Al-O-P-O-) for poly(alumino-phosphate), formed in a geopolymerization process. We focus here on the reactivity of calcined kaolinite, an aluminosilicate oxide Si 2 O 5 Al 2 O 2 , metakaolin, which led to the discovery of geopolymers 40 years ago. A distinction is made between two synthesis routes: alkaline medium (Na+, K+, Li+, Ca++, Cs+ and the like) and acidic milieu (phosphoric acid, organic carboxylic acids). The alkaline route is the most important, so far. NMR spectroscopy provides data on the molecular structure and polymeric character. The geopolymerization mechanism starts with polycondensation of oligomers into small ribbon-like molecules. This intermediary stage involves several Si-OH groups together with H 2 O molecules. It is referred to as NASH or KASH by some cement scientists and generalized to the final geopolymer structure. The poly(sialate) final structure consists of well-polymerized individual elementary nanoparticles of 5 to 40 nm in size.

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MAS-NMR studies of geopolymers heat-treated for applications in biomaterials field

Cited by 64 publications

References 16 publications

Addition of WEEE Glass to Metakaolin-Based Geopolymeric Binder: A Cytotoxicity Study

Addition of WEEE Glass to Metakaolin-Based Geopolymeric Binder: A Cytotoxicity Study

Bioactivity enhancement of calcined kaolin geopolymer with CaCl2 treatment

Inorganic Polymers (Geopolymers)

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