The crystal growth of barium flouride in aqueous solution

Barone, J. P.; Svrjcek, D.; Nancollas, G.H.

doi:10.1016/0022-0248(83)90005-2

Cited by 21 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is consistent with the known fact that, on average, the nucleation rate of bulk strontium fluoride 33 is faster than that of a bulk barium fluoride. 34 The relatively fast relaxation of strontium fluoride, unfortunately, means that we cannot track the corresponding reorganization of molecules in the organic layer, which we were able to do with barium fluoride. 28 We do see the LS-phase diffraction peaks at undersaturated concentrations ͑not shown͒ just as we have seen with other divalent ions 35 in dilute solutions.…”

Section: A Macrostrainmentioning

confidence: 95%

Organic-template-directed nucleation of strontium fluoride and barium fluoride: Epitaxy and strain

Kmetko

Evmenenko

et al. 2003

Phys. Rev. B

View full text Add to dashboard Cite

Section: A Macrostrainmentioning

confidence: 95%

Organic-template-directed nucleation of strontium fluoride and barium fluoride: Epitaxy and strain

Kmetko

Evmenenko

et al. 2003

Phys. Rev. B

View full text Add to dashboard Cite

“…T ime/nS Figure 5. (A) Time-resolved luminescence decay of 3 X 10"5 M RuII in laponite colloid (1 g/L) with various [Cu2+]: (1) 0, (2) 0.02, (3) 0.04, (4) 0.1, (5) 0.2, and (6) 0.4 mM. Insert shows the plots of the observed rate constant vs. [Cu2+]eff: Symbols are the same as in Figure 2A.…”

Section: Table IV Influence Of Cacl On the Ruii Emission Decaymentioning

confidence: 99%

“…The last decade has seen a marked interest in the photochemistry of systems in assemblies such as micelles and vesicles. 2 Recently similar attention has been paid to the photochemistry of various systems in clay films3 or in clay colloids.4 5"6 Much of the interest in the clay systems stems from the fact that these clays are strongly catalytic,7 that their occurrence in nature makes them of prime importance, and that they can provide new assembly systems for directing photochemical reactions.20 The photochemical reactions that have been investigated are mainly of a fluoroescence quenching character whereby a cationic fluorescent molecule is strongly adsorbed to the clay and its emission after excitation is quenched by various molecules which may or may not be strongly adsorbed by the clay system. An additional feature is that many naturally occurring clays contain reactive lattice metal ions such as (1) We thank the Army Research Office via Grant DAAG 29-83-K-0129 for support of this work.…”

Section: Introductionmentioning

confidence: 99%

Photochemistry of materials adsorbed on clay systems. Effect of the nature of the adsorption on the kinetic description of the reactions

Nakamura¹,

Thomas²

1985

Langmuir

View full text Add to dashboard Cite

The fluorescent probe tris(2,2'-bipyridine)ruthenium(II) (RuII) has been used to investigate the nature of the surfaces of the following clays: laponite, which is a synthetic clay, and natural hectorite and montmorillonite. RuII is adsorbed completely by the clay by ion exchange and on excitation gives rise to a luminescence spectrum in the red part of the spectrum with a lifetime of about half a microsecond. The lifetime, quantum yield, and nature of the absorption spectrum are dependent on whether the RuII is adsorbed in layers as in the natural clays or whether it is adsorbed on the surface as with laponite. At low concentrations of laponite, RuII is adsorbed on outer layers and is in contact with the aqueous phase. However, at higher clay concentrations or in the presence of calcium chloride, layering of the clay occurs and the probe molecule is placed progressively between the layers where its photophysics is altered. The casting of a film from the laponite-RuII exhibits maximum spectral change as associated with maximum colloid layer formation. Such changes are not as readily observed with hectorite or montmorillonite, and this indicates that, for the most part, these systems exist as layered colloids and that RuII is already adsorbed between the layers. Other molecules such as Cu2+, dimethylaniline, and nitrobenzene react with excited RuII through electron-transfer reactions and are also adsorbed to varying extents on the clay surface. Cu2+ is adsorbed strongly and the kinetics are simplified due to the strong adsorption. Here, Stern-Volmer type kinetics are observed and a quenching rate constant is obtained which is lower than that in the aqueous solution, which gives an estimate of the degree of movement of cupric ions on the clay surface. Dimethylaniline and nitrobenzene are adsorbed weakly on the clay. However, the clay catalyzes the reaction of the RuII with these quenchers as both are adsorbed in a small volume, i.e., the clay surface. The kinetics that describe these latter reactions are of the Poisson form, and the kinetics indicate that the reactive quencher molecules are adsorbed around the RuII, in a zonelike effect, rather than being adsorbed randomly throughout the system. This tends to indicate that the sites of adsorption are not uniform on the clay surface but occur in regions.

show abstract

“…Therefore, further regulation is still needed in synthesis to improve superhydrophobic properties. So far, numerous methods were used to synthesize the BaF 2 Crystals in previous reports, such as chemical precipitation, ame process, microemulsion, hydrothermal method, liquid-solid-solution method, thermal decomposition of tri uoroacetates, and so on [13][14][15][16][17][18][19][20][21] . Hu and Zang et al reported that the BaF 2 materials synthesized successfully by the CTAB/2-octanol/water microemulsion method [16] .…”

Section: Introductionmentioning

confidence: 99%

Formation of BaF2 Microcrystals as Superhydrophobic Materials via a Hydrothermal Method

et al. 2021

Preprint

View full text Add to dashboard Cite

Controllable BaF2 microcrystals with super-hydrophobic property have been successfully synthesized via a facile hydrothermal process. XRD, SEM and CA are used to study the structure, morphology and the hydrophobic properties of the BaF2 materials. The effects of reaction time, surfactants and pH are also detailed investigated in order to get a series of accurate reaction conditions for the preparation of BaF2 material. The results show that uniform BaF2 tetragonal phase structure was fabricated when the reaction temperature was controlled at 180 oC for 24 h. In addition, the BaF2 materials showed excellent super-hydrophobic properties. The results about the influence of time and substrates exhibit that the sample can maintain the stable super-hydrophobic property for over 10 days. As a promising super hydrophobic materials, the studies of BaF2 reported in this paper is quite practical and it has a certain guiding meaning for the future study about super hydrophobic materials.

show abstract

The crystal growth of barium flouride in aqueous solution

Cited by 21 publications

References 14 publications

Organic-template-directed nucleation of strontium fluoride and barium fluoride: Epitaxy and strain

Organic-template-directed nucleation of strontium fluoride and barium fluoride: Epitaxy and strain

Photochemistry of materials adsorbed on clay systems. Effect of the nature of the adsorption on the kinetic description of the reactions

Formation of BaF2 Microcrystals as Superhydrophobic Materials via a Hydrothermal Method

Contact Info

Product

Resources

About