Mechanical and thermal properties of fly ash-filled geopolymers

Catauro, Michelina; Tranquillo, Elisabetta; Barrino, Federico; Poggetto, Giovanni Dal; Blanco, Ignazio; Cicala, Gianluca; Ognibene, Giulia; Recca, Giuseppe

doi:10.1007/s10973-019-08612-y

Cited by 40 publications

(36 citation statements)

References 33 publications

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“…Surface treatment and application of FA has been considered as the high value-added way to solve this problem [2]. FA has been used in several areas, such as construction and building materials [3], cement and concrete applications [4], photocatalysis [5], agriculture [6], polymer [7], sewage treatment [8], and geopolymers [9,10], among which, the application of FA as filler in polymer has been considered as the most high value-added field [11]. The reason is that FA not only supplements the bulk volume of the polymer itself, but also facilitates compounding and processing when custom-shaped products are fabricated [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fly Ash Coated with Zinc Oxide Nanocomposites

Wang

Bai

et al. 2019

Materials

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Calcined fly ash (CFA) was first obtained by calcining fly ash (FA) at 815 °C for two hours. Then, composite powders of CFA coated with zinc oxide nanoparticles (ZnO/CFA, ZCFA) were prepared by heterogeneous nucleation method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Scanning electronic microscopy (SEM), Whiteness, and Brunauer-Emmett-Teller specific surface area (BET). Effects of pH value, reaction temperature and time, coating amount, solid-to-liquid ratio, the coating agent concentrations, and dropping speed on the whiteness of ZCFA powders were studied. It was shown that after coated with ZnO particles, the whiteness of CFA was increased from 27.0 to 62.6%, and the specific surface area was increased from 5.80 to 14.61 m2/g. Needle ZnO with the average grain size of 46 nm was deposited on the surface of CFA. Si–O–Zn–OH bonds were formed.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Fly Ash Coated with Zinc Oxide Nanocomposites

Wang

Bai

et al. 2019

Materials

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“…In particular, the diameter of the zone of inhibition of SiO 2 /PEG/CGA and SiO 2 /PCL/CGA were compared. The better antibacterial activity was observed when E. coli was treated with the hybrids containing PEG …”

Section: Resultsmentioning

confidence: 99%

Antibacterial Properties of Sol–Gel Biomaterials with Different Percentages of PEG or PCL

Catauro

Tranquillo

Poggetto³

et al. 2020

Macromolecular Symposia

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The aim of this work is the synthesis of antibacterial biomedical implants using sol-gel method. Different percentages (6, 12, 24, 50 wt%) of polyethylene glycol (PEG) or poly( -caprolactone) (PCL) are embedded in the silica matrix; subsequently, high amounts of chlorogenic acid (CGA 20 wt%) are added to SiO 2 /PEG and SiO 2 /PCL sol. Fourier transform infrared spectroscopy is used to evaluate the interactions among different organic and inorganic phases in the hybrid materials. Furthermore, in order to study the potential antibacterial properties of the materials, two different bacterial strains are used and the diameter of zone of inhibition is observed. CGA is a natural product that is present in coffee beans, as well as tea leaves, grapes, and apples. This natural molecule is added to sol-gel materials due to its many health-promoting properties.

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“…Therefore, neither the polymer type nor the polymer amount influences the materials bioactivity. These results suggest that the bioactivity of the hybrid systems is due to the inorganic matrix …”

Section: Resultsmentioning

confidence: 99%

Bioactive Titania‐Based Organic–Inorganic Hybrids Synthesized via Sol–Gel

Bollino

Ciprioti

Catauro

2020

Macromolecular Symposia

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In the present work, the synthesis of organic-inorganic hybrid (OIH) materials for biomedical applications is described. Two types of OIH systems are prepared by means of a sol-gel process, both consisting of a titania matrix. The use of two different biocompatible thermoplastic polymers as organic component is evaluated: the poly( -caprolactone) and the poly(ether-imide). The formation of the hybrid structure is ascertained by scanning electron microscopy, whereas the identification of the interactions between the organic and the inorganic phases is obtained by using Fourier transform infrared spectroscopy. Moreover, a preliminary evaluation of the osseointegration ability of the obtained material is investigated by soaking the synthesized OIHs in a simulated body fluid to follow the ability of the materials to induce the hydroxyapatite nucleation. The results show that all OIHs are bioactive and, thus, potentially suitable for the implants' design.

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Mechanical and thermal properties of fly ash-filled geopolymers

Cited by 40 publications

References 33 publications

Preparation and Characterization of Fly Ash Coated with Zinc Oxide Nanocomposites

Preparation and Characterization of Fly Ash Coated with Zinc Oxide Nanocomposites

Antibacterial Properties of Sol–Gel Biomaterials with Different Percentages of PEG or PCL

Bioactive Titania‐Based Organic–Inorganic Hybrids Synthesized via Sol–Gel

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