Small angle X-Ray scattering (SAXS) on calcium sulfonate dispersions: effects of friction on microstructure

Giasson, S.; Espinat, D.; Palermo, Thierry; Ober, R.; Pessah, M.; Morizur, M F

doi:10.1016/0021-9797(92)90327-i

Cited by 19 publications

(15 citation statements)

References 15 publications

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“…Such behavior is unexpected for colloidal materials. 36,37 It can result in macroscopic precipitation of the solutions for smaller sizes after excessive ''washing'' ͑several size selections͒. It is also in agreement with luminescence data where smaller quantum yield is measured for the smaller particles.…”

Section: Resultssupporting

confidence: 81%

Properties of CdSe nanocrystal dispersions in the dilute regime: Structure and interparticle interactions

Mattoussi¹,

Cumming²,

Murray³

et al. 1998

Phys. Rev. B

107

143

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We report an investigation of the properties of CdSe nanocrystal dispersions using small-angle x-ray scattering. These nanocrystals are prepared from organometallic precursors using high-temperature solution chemistry. The study provides direct and accurate measures of the nanocrystal size and size distribution. The low polydispersity measured confirms the high quality of the nanocrystals prepared using a high-temperature solution chemistry route, as anticipated from optical data. The study also provides information on the interparticle interactions and their dependence on a few relevant parameters, such as nature of the capping molecules and solvent. Nanocrystal association, e.g., dimers, in dispersions characterized by weakly attractive interactions, and/or aggregation in solutions with strong attractions, can be observed. The study also unveiled other features where interactions are reversed from repulsive stabilizing to attractive as the particle size is decreased. This behavior, unexpected for colloidal dispersions, may be caused by a reduction of the cap density as the size is decreased. The general trend for the interparticle interactions in these dispersions can be understood within the framework of a van der Waals core to core attractive potential, to which are superposed effects of cap affinity to the core and to the surrounding solvent. Within these considerations, one can distinguish three types of dispersions: sterically stabilized dispersions, dispersions thermodynamically stable but governed by weak attractions, and unstable dispersions where strong attractions induce macroscopic aggregation.

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Section: Resultssupporting

confidence: 81%

Properties of CdSe nanocrystal dispersions in the dilute regime: Structure and interparticle interactions

Mattoussi¹,

Cumming²,

Murray³

et al. 1998

Phys. Rev. B

107

143

View full text Add to dashboard Cite

show abstract

“…The complementary Tof SIMS analyses [56] established clearly the presence of under-stoechiometric calcium carbonate amorphous phase stabilized by residual calcium hydroxide. All these results are in perfect agreement with studies carried out by QELS [40], Small Angle Neutron Scattering SANS [57,58], Small Angle X ray Scattering SAXS [59], Infra red spectroscopy (IR) [60] and Chromatography/Mass Spectroscopy-NMR (CP/MAS-NMR) [61].…”

Section: Rcooh+(1+x)me(oh) + Xcosupporting

confidence: 79%

Nanolubrication

Mansot¹,

Bercion²,

Romana³

et al. 2009

Braz. J. Phys.

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Lubrication strategies developed long time ago employed amphiphilic molecular lubricant additives to confer to lubricating oils or greases specific properties such as friction reduction, antiwear, anticorrosion. The understanding of their action and the development of various type of nanoparticles are at the origin of new lubrication strategies using composite or functionalized nanoparticles in dispersion in lubricating oils or greases to confer to the lubricants the needed functions. The present work is concerned with the presentation of these new approaches. Some examples will be developed to show the main aspects of the mechanisms of action of these new nano-additives.

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“…500 [28]. Giasson et al examined an overbased calcium sulfonate dispersion showing an average calcium carbonate core radius of 2.0 nm with a standard deviation of 0.4 nm by using SAXS [40]. Dagaonkar et al [41] investigated the influence of amount of water and dispersive media on the CaCO 3 nanoparticle size mediated by the surfactant 1,2-bis-(2-ethylhexyl-oxycarbonyl)-1-ethane sulfonate (AOT), colloid particles of diameter ranged from 25 nm to around 200 nm were produced mainly depending on the volume of water added.…”

Section: Light Scattering Measurements (Dls and Sls) And Transmissionmentioning

confidence: 99%

Calcium carbonate phase transformations during the carbonation reaction of calcium heavy alkylbenzene sulfonate overbased nanodetergents preparation

Chen

Xiao

Chen

et al. 2011

Journal of Colloid and Interface Science

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Small angle X-Ray scattering (SAXS) on calcium sulfonate dispersions: effects of friction on microstructure

Cited by 19 publications

References 15 publications

Properties of CdSe nanocrystal dispersions in the dilute regime: Structure and interparticle interactions

Properties of CdSe nanocrystal dispersions in the dilute regime: Structure and interparticle interactions

Nanolubrication

Calcium carbonate phase transformations during the carbonation reaction of calcium heavy alkylbenzene sulfonate overbased nanodetergents preparation

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