Preparation of submicron talc particles by sonication

Pérez‐Maqueda, Luis A.; Durán, A.; Pérez-Rodríguez, J. L.

doi:10.1016/j.clay.2004.01.012

Cited by 88 publications

(52 citation statements)

References 22 publications

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“…While the situation after 24h could indicate that the particles of the dispersion at this time have not been sufficiently sonicated to cause the expected particle reduction, the situation after 96h could on the other hand be attributable to particle re-aggregation of broken particles arising from prolonged sonication time. There is literature report to justify that particle aggregation occurs partly after a prolonged sonication [12][13][14][15][16]. Consequently, it is reasonable to state that sonication carried out after 48h under our experimental conditions represents the practical limit for obtaining submicron narrow-sized particles.…”

Section: Characterizationsmentioning

confidence: 97%

Mechanical and Morphological Properties of Films Based on Ultrasound Treated Titanium Dioxide Dispersion/Natural Rubber Latex

Ochigbo¹,

Luyt²

2012

CMATERIALS

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Titanium dioxide dispersion was sonicated as an attempt to reduce its particle sizes and thereafter used as fillers in making natural rubber (NR) composite films. Fillers of reduced particle sizes, owing to enhanced surface areas and aspect ratios, usually result in unique property improvements. The reinforcing effects of untreated and sonicated samples of the fillers were, therefore, compared through the measurement of tensile properties of the dry films. Results, however, indicated a monotonic decrease in moduli with filler content, contrary to behaviour due to conventional fillers, but showed improvement in both elongation at break and tensile strength data at low filler concentration (2phr), and thereafter a decrease in the trend. The affinity between the filler and matrix was examined using the composite theory of Einstein. Theoretical prediction of Young's moduli from this was compared against experimental data and it was found that there was certain level of interfacial interaction.

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Section: Characterizationsmentioning

confidence: 97%

Mechanical and Morphological Properties of Films Based on Ultrasound Treated Titanium Dioxide Dispersion/Natural Rubber Latex

Ochigbo¹,

Luyt²

2012

CMATERIALS

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“…폭넓어짐 현상이 나타나는 원인은 Au 정광 시료를 기계적-화학적으로 미분쇄하는 과정에서 입자 크기가 감소하고 동시에 결정입자에 응력(strain)이 발생하기 때문이다 (Ungar, 2004;Venkateswarlu et al, 2010). 정광 시료, 건식 시료 그리고 습식 시료에 대한 황철 석 XRD 회절 peak의 폭넓어짐 현상을 다음 Scherrer 공식 (1)에 적용하여 결정크기(crystallite size)를 결정 하였다 (Chatfield et al, 1985;Perez-Rodriguez et al, 1991;Wiewiora et al, 1993, Perez-Maqucda et al, 2005Venkateswarlu et al, 2010). (Fig.…”

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Enhancement of Au·Ag Leaching by Mechanochemical Activation and Thiourea-Thiocyanate Mixing Solution

You¹,

Park²

2014

Journal of the Korean earth science society

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In order to enhance the Au · Ag leach rate, a mechanochemical activation process and a mixed thioureathiocyanate solution has been applied to Au concentrate. To achieve mechanochemical activation, the Au concentrate was mechanically ground using a dry and a wet process. The results of a particle size distribution analysis and an XRD analysis, average particle size and crystallite size were much smaller in the dry-sample than in the concentrate sample. As well the size was smaller in the wet-sample than in the dry-sample. In SEM and XRD analysis, the amorphization effect was observed in the wet-sample due to mechanochemical activation. Au · Ag leaching experiments were carried out with a thiourea solution, a thiocyanate solution and a mixed thiourea-thiocyanate solution. The Au · Ag leach rate was much greater in the dry-ground-sample than in the concentrate sample, and the leach rate was greater in the wet-ground-sample than in the dry-sample. The Au · Ag leach rate was much greater in the thiocyanate solution than in the thiourea solution, and the leaching rate was much greater in the mixed thiourea-thiocyanate solution than in the thiocyanate solution. Up to a 99% leach rate for Au · Ag were only achieved in the wet-sample using the mixed thiourea-thiocyanate leaching solution.

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“…Talc was reported to form at low temperatures in the metamorphism of the CaO-MgO-SiO 2 -H 2 O-CO 2 system [4][5][6]. Talc is characterized by a trioctahedron structure [7] and is chemically inert, soft, white, and highly thermally conductive [8]. As a result, talc is used in various industrial applications [7,9,10].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study of the Formation of Talc through CaMg(CO₃)₂–SiO₂–H₂O Interaction at 100–200°C and Vapor-Saturation Pressures

et al. 2017

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The metamorphic interaction between carbonate and silica-rich fluid is common in geological environments. The formation of talc from dolomite and silica-rich fluid occurs at low temperatures in the metamorphism of the CaO-MgO-SiO 2 -CO 2 -H 2 O system and plays important roles in the formation of economically viable talc deposits, the modification of dolomite reservoirs, and other geological processes. However, disagreement remains over the conditions of talc formation at low temperatures. In this study, in situ Raman spectroscopy, quenched scanning electron microscopy, micro-X-ray diffraction, and thermodynamic calculations were used to explore the interplay between dolomite and silica-rich fluids at relatively low temperatures in fused silica tubes. Results showed that talc formed at ≤200 ∘ C and low CO 2 partial pressures (PCO 2 ). The reaction rate increased with increasing temperature and decreased with increasing PCO 2 . The major contributions of this study are as follows: (1) we confirmed the formation mechanism of Mg-carbonate-hosted talc deposits and proved that talc can form at ≤200 ∘ C; (2) the presence of talc in carbonate reservoirs can indicate the activity of silica-rich hydrothermal fluids; and (3) the reactivity and solubility of silica require further consideration, when a fused silica tube is used as the reactor in high P-T experiments.

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Preparation of submicron talc particles by sonication

Cited by 88 publications

References 22 publications

Mechanical and Morphological Properties of Films Based on Ultrasound Treated Titanium Dioxide Dispersion/Natural Rubber Latex

Mechanical and Morphological Properties of Films Based on Ultrasound Treated Titanium Dioxide Dispersion/Natural Rubber Latex

Enhancement of Au·Ag Leaching by Mechanochemical Activation and Thiourea-Thiocyanate Mixing Solution

An Experimental Study of the Formation of Talc through CaMg(CO₃)₂–SiO₂–H₂O Interaction at 100–200°C and Vapor-Saturation Pressures

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Preparation of submicron talc particles by sonication

Cited by 88 publications

References 22 publications

Mechanical and Morphological Properties of Films Based on Ultrasound Treated Titanium Dioxide Dispersion/Natural Rubber Latex

Mechanical and Morphological Properties of Films Based on Ultrasound Treated Titanium Dioxide Dispersion/Natural Rubber Latex

Enhancement of Au·Ag Leaching by Mechanochemical Activation and Thiourea-Thiocyanate Mixing Solution

An Experimental Study of the Formation of Talc through CaMg(CO3)2–SiO2–H2O Interaction at 100–200°C and Vapor-Saturation Pressures

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An Experimental Study of the Formation of Talc through CaMg(CO₃)₂–SiO₂–H₂O Interaction at 100–200°C and Vapor-Saturation Pressures