Surface active sites introduced onto calcium carbonate powder by a new surface preparation process

Fuji, Masayoshi; Maruzuka, Nanami; Yoshimori, Jun; Takei, Takashi; Watanabe, Tohru; Chikazawa, Masatoshi; Tanabe, Katsuyuki; Mitsuhashi, Kohei

doi:10.1163/156855200750172312

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…Then, the FTIR spectra of dolomite before (DOL) and after chemical treatment with stearic acid (OMCD) in the wavenumber range of 650 to 4000 cm −1 were compared. The main difference of the IR signal can be observed at the spectral peaks of 1639.56, 2911.83 and 3464.32 cm −1 , which are assigned to the C–H stretching and O-H stretching vibration mode, as per discussed by Fuji et al [ 23 ]. However, the peaks are not observed in the DOL spectra, because they are associated with the C–H and O–H stretching modes in the organic surfactant.…”

Section: Resultsmentioning

confidence: 92%

The Mechanical and Thermal Properties of Poly(ethylene-co-vinyl acetate) (PECoVA) Composites with Pristine Dolomite and Organophilic Microcrystalline Dolomite (OMCD)

et al. 2021

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Poly (ethylene-co-vinyl acetate) (PECoVA) composite containing organophilic microcrystalline dolomite (OMCD) was studied to replace the non-recyclable silicone elastomer in biomedical application. Pristine dolomite (DOL) is an inorganic mineral filler and is hydrophilic in nature, hence incompatible with most polymers and limits its use in biomedical applications. DOL was subjected to a combination of size reduction, tip sonication and a surface modification process to obtain a more effective dolomite filler, known as OMCD, as reinforcement material in the PECoVA copolymer matrix. The effects of DOL and OMCD loadings (1, 3, 5 wt%) on the structure and properties of the PECoVA composite were investigated. According to the X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), tensile and tear tests, dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) analysis, the use of the OMCD filler brought a more pronounced positive impact to the PECoVA matrix as opposed to the DOL, where it enhanced the crystallinity of the matrix and led to much better matrix–filler interfacial interactions. Therefore, regardless of the filler loading, the PECoVA/OMCD composites demonstrate greater mechanical and thermal properties compared to the PECoVA/DOL composites. The best composite was produced with the OMCD loading of 3 wt%, in which the tensile strength (22.1 MPa), elongation at break (1413%) and Young’s modulus (2.0 MPa) of the copolymer matrix were increased by 44%, 23% and 21%, respectively. This proved that the combination of size reduction, tip sonication and the surface modification technique is efficient to obtain the PECoVA/dolomite composite with improved performance.

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Section: Resultsmentioning

confidence: 92%

The Mechanical and Thermal Properties of Poly(ethylene-co-vinyl acetate) (PECoVA) Composites with Pristine Dolomite and Organophilic Microcrystalline Dolomite (OMCD)

et al. 2021

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“…For this reason, the single modifier reacts with a hydroxyl group on the surface of the alumina particles without polymerization among modifiers. At the same time, owing to steric hindrance with the stearoyl groups, individual Ti atoms appeared to exist on the surface of the alumina particles, separated from each other at a regular specific distance between the atoms [17][18] . In order for these features to be utilized for accurate surface design of alumina powder, the authors chose the above-mentioned modifier.…”

Section: Sample Preparationmentioning

confidence: 99%

“…However, a similar study was still lacking for TiO 2 /Al 2 O 3 systems. To address this issue, the authors have attempted atomic level surface design for alumina powder by employing a surface modification processes in order to allow TiO 2 to be supported on Al 2 O 3 [17][18] . With this technique, the authors introduced Ti atoms onto the surface of alumina particles (the base material) to increase gradually Ti sites on the alumina particles, thereby transforming Al 2 O 3 into a photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Surface Structure and Photocatalytic Activity of Ti Supported on Alumina Powder [Translated]<sup>†</sup>

Fuji

Sugiyama

Takei

et al. 2004

KONA

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Surface modified alumina powder that has photocatalytic activity was studied. To control the amount of Ti introduced on the surface at the molecular level, the powder was prepared by chemical surface modification with a monofunctional titanate-based coupling agent, followed by partial oxidation of the modification group. The surface density of Ti introduced onto the surface was quantitatively increased with the concentration of the modifying reagent, and/or repetition of the modification. Furthermore, the relationship between the surface structure and the occurrence of photocatalytic activity was examined. The surface structure was measured by XPS and UV-Visible absorption spectrometry. The photocatalytic activity was determined by measuring the degradation of Methylene Blue molecules in water solution with UV irradiation. Photocatalytic activity was realized at a Ti surface density of 3.7 nm Ҁ2. The optical absorption edge in UV of the sample shifted to longer wavelengths. The ability as a photocatalyst increased with the amount of Ti-O-Ti. Photocatalytic activity was recognized to be related to the amount of Ti-O-Ti on the alumina surface and the ability of UV absorption.

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“…During the milling process, the added chemical agent will be coated on the surface of the powders, consequently endowing them with hydrophobic property. The hydrophobic performance of the powders prepared by this method is dependent on a number of parameters, including such as the nature and amount of the powders and surfactant, ball to solid ratio, milling speed and time [20,21]. Unlike the soft chemical method in which certain parameters crucially affect the preparation efficiency, no significant issues exist in mechanical approaches [20].…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the soft chemical method in which certain parameters crucially affect the preparation efficiency, no significant issues exist in mechanical approaches [20]. Comparing with the soft chemical method with which the target powders are added to the solution of surfactant agent, physical coating method like ball milling sometimes shows coating defects, especially when the powders present irregular shape [21]. The uncoated parts of the target powder will decrease the hydrophobicity.…”

Section: Introductionmentioning

confidence: 99%

Synthesizing super-hydrophobic ground granulated blast furnace slag to enhance the transport property of lightweight aggregate concrete

2018

Construction and Building Materials

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Surface active sites introduced onto calcium carbonate powder by a new surface preparation process

Cited by 6 publications

References 12 publications

The Mechanical and Thermal Properties of Poly(ethylene-co-vinyl acetate) (PECoVA) Composites with Pristine Dolomite and Organophilic Microcrystalline Dolomite (OMCD)

The Mechanical and Thermal Properties of Poly(ethylene-co-vinyl acetate) (PECoVA) Composites with Pristine Dolomite and Organophilic Microcrystalline Dolomite (OMCD)

Surface Structure and Photocatalytic Activity of Ti Supported on Alumina Powder [Translated]<sup>†</sup>

Synthesizing super-hydrophobic ground granulated blast furnace slag to enhance the transport property of lightweight aggregate concrete

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