Morphology control and interlayer pillaring of swellable Na-taeniolite mica crystals

Yamaguchi, Tomohiro; Ikuta, K.; Taruta, Seiichi; Kitajima, Kunio

doi:10.1016/j.mseb.2012.01.007

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…Although mica has a naturally layered structure, it does not allow water molecules to penetrate into its structure in aqueous environments as a result of factors includes high charge density between the layers, insufficient hydration energy of the interlayer potassium ions to overcome the cooperative structural forces at the coherent edges of a cleavage surface and strong bonding force between layers [4]. In order to make the muscovite mineral swellable in an aqueous environment, (K + ) ions between the layers of natural mica should be reduced and natural mica should be converted to Na + mica in turn reducing the bonding force between the layers in a controlled process [5][6][7]. This requires the intercalation and/or delamination of functional molecules into the mica mineral interlayers for the purpose of using mica mineral-based nanocomposite products in many industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Development of Nanosized Mica Particles from Natural Mica by Sonication/Organic Intercalation Method for Pearlescent Pigment

Malayoğlu

Besun²

2020

Minerals

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In this study, the possibility of reducing natural mica particles to nanosizes without damaging its surface properties and smooth flake shape for pearlescent pigment application was investigated by using the sonication delamination method. For this purpose, the layer charge density of the natural mica mineral was reduced using surfactant intercalation followed by maximum exfoliation of mica interlayers with the help of sonication. Therefore, the delamination was achieved in a simple and more energy-efficient way by the sonication process and, in turn, the dimensions of mica were reduced to nanoscale with smooth surface features. With this new delamination process, the lowest particle thickness values were obtained as 0.061 microns after only 1 h sonication period. The results were found to be much significant when compared to the literature. Furthermore, the unique pearlescent pigment properties of mica particles were attributed to the characteristic shape and nanosized mica, which are coated with TiO2.

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Section: Introductionmentioning

confidence: 99%

Development of Nanosized Mica Particles from Natural Mica by Sonication/Organic Intercalation Method for Pearlescent Pigment

Malayoğlu

Besun²

2020

Minerals

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“…A fine crystal-morphology plays an important role in the safety and stability of a material [5][6][7]. Methods for controlling crystal-morphology can therefore be used to regulate nucleation and crystal growth during the crystallization process to increase the production and use of security of energetic materials, and improve their energy output performances [8][9][10][11][12].…”

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confidence: 99%

Morphological control of zinc tricarbohydrazide perchlorate crystals: Theoretical and experimental study

Shen

Zhang

et al. 2013

Chin. Sci. Bull.

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The theoretical crystal-morphology of zinc tricarbohydrazide perchlorate (ZnCP) was studied using the morphology simulation software. The growth trends and surface characteristics were calculated using the Bravais-Friedel-Donnay-Harker (BFDH), Growth Morphology, and Equilibrium Morphology methods; these provide theoretical guidance for the choice of crystal-control reagents. On the basis of the simulations, experiments were carried out to study the effects of five different crystal-control reagents, including carboxymethylcellulose (A), polyacrylamide (B), dextrin (C), Tween 40 (D), and Tween 60 (E), in the control of the crystal-morphology of ZnCP. Mixtures of two reagents and higher temperatures were used to further optimize the ZnCP crystals. The results show that ZnCP crystals are well dispersed, and have a large apparent density and regular crystal-morphology under the control of a mixture of reagents A and E in a mass ratio of 1:4 at 80°C. The crystal-morphology of an energetic material has a direct effect on its physical properties such as fluidity, apparent density, electrostatic accumulation, and pressure resistance, and even has an important impact on its chemical and explosive properties such as stability, detonation ability, and sensitivity [1,2]. Generally, a material with a smooth surface, uniform particles, and spherical crystals has many advantages over needle-or twig-like irregular crystals, such as good fluidity, high apparent density (more than 0.8 g/cm 3 ), low sensitivity, and stable performance [3,4]. A fine crystal-morphology plays an important role in the safety and stability of a material [5][6][7]. Methods for controlling crystal-morphology can therefore be used to regulate nucleation and crystal growth during the crystallization process to increase the production and use of security of energetic materials, and improve their energy output performances [8][9][10][11][12]. Zinc tricarbohydrazide perchlorate ([Zn(CHZ) 3 ](ClO 4 ) 2 , ZnCP) is a new green energetic coordination compound that excludes toxic heavy metals [13]. However, ZnCP crystals prepared using traditional synthetic techniques are too small, fragmented, and irregular, and have poor fluidity and a small apparent density (less than 0.7 g/cm 3 ), leading to weak explosive power. Crystal-morphology control using a crystalcontrol reagent would improve the crystal quality, and enable ZnCP to be used as a green energetic material in practical applications.In this study, the crystal-morphology and crystal-face parameters of ZnCP were simulated using the Morphology module of the Materials Studio simulation software (MS Morphology, Accelrys Corp., San Diego, CA, USA). Based on the theoretical calculations, experiments were performed to select the optimum crystal-control reagents and reaction conditions for the crystal-morphology optimization of ZnCP.

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Heteroatom framework distribution and layer charge of sodium Taeniolite

Perdigón

Pesquera

Cota

et al. 2018

Applied Clay Science

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12The most advanced applications of clays depend crucially on their hydration state and 13 swelling is probably the most important feature of expandable 2:1 layered silicate. 14 Sodium Taeniolite, Na-TAE, a swelling trioctahedral fluormica, has been synthesized 15 and studied using thermogravimetric analysis, X-ray diffraction, scanning electron 16 microscopy and infrared and solid state NMR spectroscopies. The results indicated the 17 formation of a swelling 2:1 phyllosilicate with actual layer charge lower than the 18 nominal one. Herein, a new heteroatom distribution and more accurate composition 19 could be deduced. 20 21 22 23 24 25 2 26 48 governed by those structural features because their swelling behaviour depends on the 49 repulsive forces relating to the interactions between the 2:1 layers and the attractive 50 3 forces between the interlayer cation and the negative charged siloxane surface (Pavon et 51 al., 2014). 52True and brittle natural micas constitute a major group of those 2D host 53 materials but layer charge is high and strong Coulomb interactions with interlayer 54 cations usually inhibit their swelling and hence, a very low cation-exchange capacity 55 (CEC) results and limits applicability. However, as will be shown in the following, 56 swelling high-charge micas can be easily synthesized and their CEC tuned via the 57 degree of isomorphous substitution, broadening their wide-ranging uses. 58Depending on the origin of the layer charge, two family of swelling mica can be 59 found. First, synthetic fluorine micas have been recently synthetized (Alba et al., 2006) 60 that are able to swell despite their high layer charge originated in the tetrahedral sheet 61 by Si/Al replacements (Alba et al., 2006; Naranjo et al., 2015; Pavon et al., 2013). 62Consequently, those materials, referred as Na-n-Mica or Na-Mica-n (being n the layer 63 charge and related to the ratio Si/Al) have potential used as decontaminants and storage 64 media (Alba et al., 2006; Garcia-Jimenez et al., 2016; Gregorkiewitz and Rausell-65 Colom, 1987; Park et al., 2002; Paulus et al., 1992). 66 Second, synthetic sodium Taeniolite, an analogous of the swelling fluoromica 67 Na-Mica-2, where substitutions in the octahedral sheet (Mg/Li) are the ultimate 68 responsible of layer charge (Kitajima et al., 1985; Kitajima and Takusagawa, 1990; 69 Kitajima et al., 1991). Sodium Taeniolite (NaSi4Mg2LiO10F2·xH2O) exhibits reversible 70 swelling (Toraya et al., 1977) and Kitajima et al. (Kitajima et al., 1973) explained its 71 swelling characteristics by the high hydration energy of the interlayer sodium ions.72Taeniolite derivatives are interesting microporous host materials that can be used as 73 sensors for redox-active ambient gas (Baumgartner et al., 2008; Mariychuk et al., 2007). 74 4 The capability of the 2:1 structure to vary the framework chemical composition 75 and heteroatom distribution is crucial to design new materials with desired properties; 76 however, it leaves one worrying about the homogeneity of the synthesized mater...

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Morphology control and interlayer pillaring of swellable Na-taeniolite mica crystals

Cited by 4 publications

References 21 publications

Development of Nanosized Mica Particles from Natural Mica by Sonication/Organic Intercalation Method for Pearlescent Pigment

Development of Nanosized Mica Particles from Natural Mica by Sonication/Organic Intercalation Method for Pearlescent Pigment

Morphological control of zinc tricarbohydrazide perchlorate crystals: Theoretical and experimental study

Heteroatom framework distribution and layer charge of sodium Taeniolite

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