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1

The Dependence of Castings Quality Produced in Clay Moulding Mixtures from the Properties of Binder Based on a Montmorillonite

100%

Vasková I., Fecko D., Malik J.

Archives of Foundry Engineering

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2012

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issue 3

2

Mechanism of rhodamine 6G molecular aggregation in montmorillonite colloid

100%

Lofaj M., Valent I., Bujdák J.

Open Chemistry

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2013

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vol. 11

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issue 10

1606-1619

EN

Stopped-flow mixing device and visible absorption spectroscopy were used for the analysis of dye rhodamine 6G (R6G) molecular aggregation in the colloids based on Na-saturated montmorillonite. Two stages of the reaction were identified: The first stage was very short and taking only several seconds, involving the adsorption of R6G cations and their initial aggregation on the surface of colloid particles. The initially formed J-aggregates exhibited similar spectral properties as monomeric form of R6G. In the second stage, initially formed aggregates converted to sandwich-type H-aggregates absorbing light at significantly lower wavelengths and adsorbed monomers. The aggregate rearrangement took several hours. Monomers, with the spectral properties identical to R6G solution, were also identified as a component in complex spectra using principal component analysis (PCA) and multivariate curve resolution (MCR). Partial bleaching of the dye was also proven. Reaction kinetics of the rearrangement of the aggregates followed the model considering a complex mechanism of the molecular aggregation. Data fits using stretched-exponential function led to the determination of rate constants, which had been in the range 10−3−4×10−3s−1. [...]

3

The effect of layer charge and exchangeable cations on sorption of biphenyl on montmorillonites

100%

Pálková H., Madejová J., Komadel P.

Open Chemistry

|

2009

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vol. 7

|

issue 3

494-504

EN

Montmorillonies separated from the bentonites SAz-1 (Cheto, AZ, USA), and Cressfield (New South Wales, Australia) were used as starting materials. Reduced charge montmorillonites (RCMs) were prepared from these chemically different and Li-saturated montmorillonites via heating at temperatures in the range of 120–300°C. The residual exchangeable Li+ cations were then replaced with tetramethylammonium (TMA+) or hexadecyltrimethylammonium (HDTMA+) cations and the ability of the modified montmorillonites to adsorb biphenyl was investigated. Lower adsorption was observed for Li-montmorillonites than for the organoclays. The extent of adsorption was dependent on both the layer charge of montmorillonite and the size of alkylammonium cations. HDTMA-forms prepared from unheated Li-montmorillonites adsorbed biphenyl better than the organoclays prepared from RCMs. In contrast, the TMA-samples prepared from the Li-montmorillonites that were not heated showed low uptake of biphenyl probably due to high content of TMA+ cations. Reduction of the layer charge, resulting in lower content of TMA+ cations, increased sorption efficiency of both TMA-montmorillonites. The best adsorbents of biphenyl were HDTMA-SAz-1 prepared from the unheated Li-SAz-1 and TMA-Cressfield prepared from the Li-form heated at 180°C. These samples removed about 80% of biphenyl from its aqueous solutions [...]

4

Effect of Bentonite Clay Addition on the Thermal and Mechanical Properties of Conventional Moulding Sands

86%

Kamińska J., Puzio S., Angrecki M., Kamińska J., Puzio S., Angrecki M.

Archives of Foundry Engineering

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2020

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vol. 20

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issue 1

5

Studies of Poly(Acrylic Acid-co-Maleic Acid) Sodium Salt Intercalated Montmorillonite

86%

Grabowska B., Cukrowicz S., Kurleto-Kozioł Ż., Kaczmarska K., Drożyński D., Sitarz M., Bobrowski A., Grabowska B., Cukrowicz S., Kurleto-Kozioł Ż., Kaczmarska K., Drożyński D., Sitarz M., Bobrowski A.

Archives of Foundry Engineering

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2019

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vol. 19

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issue 4

6

139 Assessment Criteria of Bentonite Binding Properties

86%

Żymankowska-Kumon S.

Archives of Foundry Engineering

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2012

|

issue 3

7

Structural Studies (FTIR, XRD) of Sodium Carboxymethyl Cellulose Modified Bentonite

86%

Cukrowicz S., Grabowska B., Kaczmarska K., Bobrowski A., Sitarz M., Tyliszczak B., Cukrowicz S., Grabowska B., Kaczmarska K., Bobrowski A., Sitarz M., Tyliszczak B.

Archives of Foundry Engineering

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2020

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vol. 20

|

issue 3

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The Dependence of Castings Quality Produced in Clay Moulding Mixtures from the Properties of Binder Based on a Montmorillonite

Mechanism of rhodamine 6G molecular aggregation in montmorillonite colloid

The effect of layer charge and exchangeable cations on sorption of biphenyl on montmorillonites

Effect of Bentonite Clay Addition on the Thermal and Mechanical Properties of Conventional Moulding Sands

Studies of Poly(Acrylic Acid-co-Maleic Acid) Sodium Salt Intercalated Montmorillonite

139 Assessment Criteria of Bentonite Binding Properties

Structural Studies (FTIR, XRD) of Sodium Carboxymethyl Cellulose Modified Bentonite