Relationship between Surface Roughness, Internal Crystal Perfection, and Crystal Growth Rate

Galbraith, Shaun; Flood, Adrian E.; Rugmai, Supagorn; Chirawatkul, Prae

doi:10.1002/ceat.201500286

Cited by 9 publications

(9 citation statements)

References 40 publications

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“…Many substances exhibit wide face, directional, and mass growth rate dispersion under different growth conditions. − It is shown that dissolution and refaceting narrow these dispersions. , It can be seen from Figures , , and that for all investigated macroscopic external conditions, a wide range of face growth rates exists after refaceting. These growth rate distributions can be described by a simple normal distribution, as was shown previously .…”

Section: Discussionmentioning

confidence: 91%

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Investigation of Growth Mechanisms of Sodium Chlorate Crystals from Aqueous Solutions

Radiša

Mitrovic

Misailović

et al. 2016

Ind. Eng. Chem. Res.

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Difficulties in determining the crystal growth mechanism from growth rate versus solution supersaturation dependence are discussed. Obtained results indicate that in the supersaturation range of 0.66−1.56%, sodium chlorate crystals grow in accordance with the spiral growth model. It is shown that in the supersaturation range of 0.44−1.32%, the growth mechanism depends on crystal growth history. Namely, the exponent n in the power law R = Kσ n depends on the manner of supersaturation changes (varied from 1.3 to 1.9%). This indicates that the overlapping of diffusion fields of neighboring steps depends on growth history.

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Section: Discussionmentioning

confidence: 91%

“…Crystal growth rate dispersion, which occurs for many substances, ,− complicates analysis of ( R , σ) dependence. Dispersion of growth rates in one direction (sum of growth rates of opposite faces) is wider than dispersion of face growth rates.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Growth Mechanisms of Sodium Chlorate Crystals from Aqueous Solutions

Radiša

Mitrovic

Misailović

et al. 2016

Ind. Eng. Chem. Res.

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“…Thereafter, there was a decrease in the average lattice strain in CR4 and CR5, which showed similar average lattice strain values as that of CR1 (0.041). Since the lattice strain is inversely related to the crystal perfectness, low average lattice strain values indicated that the fat crystal network of CR4 and CR5 was highly ordered [ 59 ]. In a nutshell, we observed that the inclusion of GO in the oleogels enhanced the compactness and formation of large-sized crystallites with very low lattice imperfections.…”

Section: Resultsmentioning

confidence: 99%

Graphene Oxide Increases Corneal Permeation of Ciprofloxacin Hydrochloride from Oleogels: A Study with Cocoa Butter-Based Oleogels

Qureshi

Choudhary

Mohanty³

et al. 2020

Gels

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In this work, oleogels of cocoa butter (CB), rice bran oil (RBO), and graphene oxide (GO) were prepared. The prepared oleogels were subjected to various characterization techniques such as bright-field microscopy, X-ray diffraction (XRD), crystallization kinetics, differential scanning calorimetry (DSC), and mechanical studies. The influence of increasing GO content on the in vitro drug release and ex vivo corneal permeation of the model drug (ciprofloxacin HCl—CPH) from the oleogels was also investigated. Bright-field micrographs showed that increment in GO content reduced the size of the globular particles of CB. XRD analysis revealed that CB was crystallized in its β’ and β polymorphic forms in the oleogels, which was in agreement with thermal studies. The mechanical characterization demonstrated that the presence of GO improved the elastic nature and stress-bearing properties of the oleogels. Moreover, GO altered the crystallization kinetics of CB in the oleogels in a composition-dependent manner. The in vitro release of CPH from the oleogels occurred through either Fickian diffusion or fat network relaxation or a combination thereof. Furthermore, the inclusion of GO enhanced the ex vivo permeation of CPH molecules across the caprine cornea. Hence, we concluded that the prepared oleogels could be explored as potential delivery systems for ophthalmic applications.

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“…These morphologic characteristics of fayalite and their absence at the surface of FeO-rich olivine crystals identified in chondrites could indicate a change in the chemical composition of the fluid. Previous studies show that crystals growing in high supersaturation solutions have rougher, irregular surfaces (on a macroscopic rather than molecular scale) than those growing in low supersaturation solutions (Galbraith et al, 2016;Pantaraks et al, 2007). Although the difference in saturation for the chemical composition of the fluid in chondrites and the hydrothermal experiment cannot be disregarded, these morphologic characteristics could have been erased by subsequent metamorphic processes in chondrites (Allende, Kaba, and Tieschitz; Brearley, 2009;Dobric a & Brearley, 2014;Krot et al, 1997;Watt et al, 2006;Weisberg et al, 1997).…”

Section: Discussionmentioning

confidence: 98%

Fayalite formation through hydrothermal experiments: Insights into early fluid‐assisted aqueous alteration processes on asteroids

Dobricǎ

Nuth

Brearley

2022

Meteorit & Planetary Scien

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In order to understand the effects of the earliest fluid-assisted hydration processes on asteroids, we performed one hydrothermal experiment using three different reactants (FeO-rich amorphous silicates, iron metal powder, and water) at conditions informed by our current state of knowledge of asteroidal alteration. This experiment provides, for the first time, clear evidence that the growth of fayalite can occur during hydrothermal alteration, as described previously in meteorites. These newly formed fayalite crystals are elongated and porous, similar to the ones described in CV3, CK, and ordinary chondrites. The results show that (1) fayalite could form even if chemical equilibrium was not reached in the experiment, at a water to rock mass ratio (0.4 W/R at the beginning of the experiment) higher than the values calculated to be thermodynamically viable at equilibrium (W/R > 0.2); (2) the composition and the texture of the reactants changed during the hydrothermal alteration process, suggesting that the reactants, especially the amorphous silicates, underwent dissolution and reprecipitation; (3) fayalite can form at low temperature (220 °C), which is at the transition between hydrothermal alteration and fluid-assisted metamorphism in chondrites. The results are consistent with previous mineralogical observations and thermodynamic models, which suggest that fayalite crystals are formed on asteroidal parent bodies by the interaction between a hydrothermal fluid and disequilibrium assemblages that compose the pristine materials that condensed in the early solar nebula. This experiment suggests that two variables play a very important role in the formation of fayalite during the hydrothermal growth (W/R mass ratio and the fluid composition). These results are similar to the recent observations of the fine-grained matrix of ordinary chondrites.

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Relationship between Surface Roughness, Internal Crystal Perfection, and Crystal Growth Rate

Cited by 9 publications

References 40 publications

Investigation of Growth Mechanisms of Sodium Chlorate Crystals from Aqueous Solutions

Investigation of Growth Mechanisms of Sodium Chlorate Crystals from Aqueous Solutions

Graphene Oxide Increases Corneal Permeation of Ciprofloxacin Hydrochloride from Oleogels: A Study with Cocoa Butter-Based Oleogels

Fayalite formation through hydrothermal experiments: Insights into early fluid‐assisted aqueous alteration processes on asteroids

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