Characteristics evaluation of calcium carbonate particles modified by surface functionalization

Tang, Zhongfeng; Cheng, Guojun; Chen, Youshuang; Xiuhua, Yu; Wang, Honglong

doi:10.1016/j.apt.2014.05.017

Cited by 38 publications

(17 citation statements)

References 14 publications

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“…a), exhibiting a hydrophilic character with the water drop infiltrating instantly. Figure b displays that KH‐550 of coupling agent has a certain effect on whiskers, whereas outwards of hydrophilic amidogen leads to a lower contact angle, this result is consistent with the study of Tang et al The evolution of the contact angle of treated samples by fatty acid with the increase of chain length is illustrated in Fig. (c‐h), indicating an enhancement in contact angle from 104.08° to a maximum of 137.87°.…”

Section: Resultssupporting

confidence: 89%

Investigation into the surface modification of aragonite whiskers

Jing

Nai

Zhu

et al. 2016

Surface & Interface Analysis

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Aragonite whiskers (AWs) were treated with several fatty acid surfactants and silane coupling agent in order to determine the optimal modifier by using contact angle measurements. The results revealed that the AWs modified by fatty acids showed more remarkable increase in the contact angle than by silane, suggesting the former were preferentially applied in modifying AWs. While the samples coated with fatty acids exhibited hydrophobicity with contact angles ranging from 104.08°to 137.87°with increasing of carbon chain length. Therefore, the highest contact angle of AWs treated by oleic acid was discussed in detail as an example, which was characterized by field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), thermo-gravimetry analyses (TGA), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR). FESEM and TEM results showed a thin layer coated on the modified sample surface. Both the results of TGA and XPS confirmed organic groups existed in the sample of AWs treated by oleic acid. FTIR demonstrated that calcium dioleate was formed in the modification process. Further, modification mechanism was proposed based on the obtained results.

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Section: Resultssupporting

confidence: 89%

Investigation into the surface modification of aragonite whiskers

Jing

Nai

Zhu

et al. 2016

Surface & Interface Analysis

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“…As is seen from Fig. (b), apart from the characteristic absorption peaks of blank CaCO 3 at 1423, 870, and 706 cm ‐1 , the new peaks appear around 2980 and 2870 cm ‐1 , corresponding to the stretching vibration of methylene of APTS, more importantly, other new absorption peaks at 1150 and 1043 cm ‐1 present Si–O–Si and Si–O–C group, which indicate the nano‐CaCO 3 has been modified by APTS. For GO‐CaCO 3 hybrids exhibited in Fig.…”

Section: Resultsmentioning

confidence: 88%

“…81‐2027). The 2θ value of 23.2°, 29.5°, 36.1°, 39.6°, 43.3°, 47.6°, 48.7°, 56.6°, and 57.6° correspond to the (012), (104), (110), (113), (202), (018), (116), (211), and (122) crystal faces of calcite, respectively . Moreover, an interesting phenomenon that a new diffraction peak at 2θ = 9.9° can be observed in the curve of GO‐CaCO 3 nanohybrids (Fig.…”

Section: Resultsmentioning

confidence: 92%

Anchoring calcium carbonate on graphene oxide reinforced with anticorrosive properties of composite epoxy coatings

et al. 2016

Polym. Adv. Technol.

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Calcium carbonate nanoparticles (nano-CaCO 3 ) anchored graphene oxide (GO) sheet nanohybrids (GO-CaCO 3 ) are fabricated, and their structure can be measured by scanning electron microscope, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and Fourier-transform infrared spectroscopy analysis. Afterwards, composite epoxy coatings, filled with GO and GO-CaCO 3 nanohybrids, are prepared via a curing process. The dispersion and anticorrosive properties of composite epoxy coatings are investigated. The results reveal that GO-CaCO 3 nanohybrids achieve a homogeneous dispersion as well as reinforce corrosion resistance of epoxy coatings. Furthermore, the anticorrosive mechanisms are tentatively proposed for the GO-CaCO 3 /epoxy coatings.

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“…According to the literature, various methods [4,5] such as coupling agent coating treatment, dichromate passivation reducing treatment, sol-gel spin coating technique, and silicone resin films coating treatment have been used to improve the oxidation resistance of Nd 2 Fe 14 B. Among the above mentioned methods, coating treatment using silane coupling agent KH550 not only improves the oxidation resistance, but also exhibits positive effects on enhancing dispersion in organic media [6] and promoting the adhesion between inorganic magnetic powders and organic adhesive in the following process of manufacturing bonding plastic magnet [7]. However, the surface modification of NdFe 12 N x magnetic powder for enhancing the oxidation resistance has never been studied till date.…”

Section: Introductionmentioning

confidence: 99%