Influence of interlayer species on the thermal characteristics of montmorillonite

Chen, Qingze; Zhu, Jianxi; Ma, Longlong; Zhou, Qing; He, Hongping

doi:10.1016/j.clay.2016.09.014

Cited by 43 publications

(6 citation statements)

References 48 publications

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“…Cations and water are not part of the crystalline structure and can be easily replaced by other cations: The lamellae layers are bonded each other by weak interaction forces (Van der Waals bonds) and therefore can be easily separated from each other [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Another peculiar characteristic of montmorillonite is thixotropy, that is, that peculiar characteristic of a few clays to give rise, when they are dispersed in a certain aqueous solution with Cations and water are not part of the crystalline structure and can be easily replaced by other cations: The lamellae layers are bonded each other by weak interaction forces (Van der Waals bonds) and therefore can be easily separated from each other [13,14].…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly Processes in Hydrated Montmorillonite by FTIR Investigations

Caccamo

Mavilia

et al. 2020

Materials

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Experimental findings obtained by FTIR and Raman spectroscopies on montmorillonite-water mixtures at three concentration values are presented. To get some insight into the hydrogen bond network of water within the montmorillonite network, FTIR and Raman spectra have been collected as a function of time and then analyzed following two complementary approaches: An analysis of the intramolecular OH stretching mode in the spectral range of 2700–3900 cm−1 in terms of two Gaussian components, and an analysis of the same OH stretching mode by wavelet cross-correlation. The FTIR and Raman investigations have been carried as a function of time for a montmorillonite-water weight composition (wt%) of 20–80%, 25–75%, and 35–65%, until the dehydrated state where the samples appear as a homogeneous rigid layer of clay. In particular, for both the FTIR and Raman spectra, the decomposition of the OH stretching band into a “closed” and an “open” contribution and the spectral wavelet analysis allow us to extract quantitative information on the time behavior of the system water content. It emerges that, the total water contribution inside the montmorillonite structure decreases as a function of time. However, the relative weight of the ordered water contribution diminishes more rapidly while the relative weight of the disordered water contribution increases, indicating that a residual water content, characterized by a highly structural disorder, rests entrapped in the montmorillonite layer structure for a longer time. From the present study, it can be inferred that the montmorillonite dehydration process promotes the layer self-assembly.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Assembly Processes in Hydrated Montmorillonite by FTIR Investigations

Caccamo

Mavilia

et al. 2020

Materials

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“…The major band observed close to 1000 cm −1 in the FTIR spectrum of hydroxyapatite corresponds to the stretching vibrations of the phosphate (PO 4 ) groups in the compound [28]. The peek at 3621 cm −1 is due to the OH − functional group stretching vibration [29], The OH band provides information about the hydrogen bonding environment and structural properties of hydroxyapatite . The bands at 602 and 564 cm −1 are attributed to v4 bending mode of PO 4…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Densification of nanocrystalline hydroxyapatite powder via sintering: enhancing mechanical properties for biomedical applications

Akram

Khan

Amjad

et al. 2023

Mater. Res. Express

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The effect of compaction load, sintering temperature and soaking time on the sinter-ability and densification of Nano crystalline hydroxyapatite (HA) was assessed. The compaction and sinter-ability of HA particles was done at three different compaction loads and temperatures ranging from 1 ton to 5 ton and 850 ⁰C to 1250 ⁰C, respectively. Compaction of the green pellets was best achieved at 5-ton compaction load and it’s percent green densification was up to 50% of the theoretical density of HA (3.16g/cm3). For sintered density, the best results were achieved at a temperature of 1250⁰C and a compaction load of 1 ton which were 98% of the theoretical density. Soaking time at these sintering temperatures was varied between 1 and 3 hours and was found that with the variation of soaking time from 3 hours to 1 hour, the sintered density decreased tremendously at 850⁰C from 85% to 50% whereas at higher temperatures the decrease in density was only 4 to 6%. The maximum hardness of 625 (+28) HV1 was obtained for HA sintered at 1250⁰C with a soaking time of 3 hours. Phase analyses were carried out using an X-Ray diffractometer. The HA phase was stable even at the highest sintering temperature of 1250⁰C and did not decompose into α tri-calcium phosphate (TCP) and β TCP. The grain size was reduced by decreasing soaking time and lowering sintering temperature.

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“…In recent years, various studies have showed that the polymer matrix containing nanofillers not only has good biological properties but also has sufficient mechanical properties [40,41]. As a natural clay nanomaterial, MMT not only has a large specific surface area, large aspect ratio, high rigidity, and good processibility but also can be well combined with polymeric matrix materials through physical or chemical effects [42,43]. It has been reported that only a lower content of nanomontmorillonite filler was needed to significantly improve the mechanical properties of composite materials [38].…”

Section: Montmorillonite Improves the Mechanical Properties Of The Scaffoldmentioning

confidence: 99%

Progress in Montmorillonite Functionalized Artificial Bone Scaffolds: Intercalation and Interlocking, Nanoenhancement, and Controlled Drug Release

Dong-ying

Пин

et al. 2022

Journal of Nanomaterials

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Montmorillonite (MMT) has attracted widespread attention in the field of bone tissue engineering in recent years because of its interlayer domain structure. The progress of MMT application was reviewed in this article. Concretely, the application of MMT was mainly explained from the structural characteristics, mechanical strengthening mechanism, organic functionalization, and drug loading and release. Firstly, the polar polymer molecular chains are easily induced into the interlayer domain of MMT to form an interlock and achieve the mechanical strengthening of scaffold. Secondly, the “sandwich” sheet structure of MMT can be exfoliated into graphene-like MMT nanosheets, providing a nanostrengthening effect for polymer matrix. In addition, MMT’s interlayer domain provides a favorable environment for the loading and slow release of drugs, and it is an ideal platform for the functionalization of bone scaffolds. More importantly, MMT can be easily modified by cation exchange and chemical reaction to further improve the compatibility of composites: such as strengthening mechanical interlocking and nanostrengthening effects and achieving controllable loading and release of drugs. It is expected to provide a reference for improving the application of bone tissue engineering scaffolds.

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Influence of interlayer species on the thermal characteristics of montmorillonite

Cited by 43 publications

References 48 publications

Self-Assembly Processes in Hydrated Montmorillonite by FTIR Investigations

Self-Assembly Processes in Hydrated Montmorillonite by FTIR Investigations

Densification of nanocrystalline hydroxyapatite powder via sintering: enhancing mechanical properties for biomedical applications

Progress in Montmorillonite Functionalized Artificial Bone Scaffolds: Intercalation and Interlocking, Nanoenhancement, and Controlled Drug Release

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