Particle Size and Rapid Stability Analyses of Concentrated Dispersions: Use of Multiple Light Scattering Technique

Bru, Pascal; Brunel, Laurent; Buron, H.; Cayré, I.; Ducarre, X.; Fraux, A.; Mengual, O.; Meunier, Gérard; Marie, A. de Sainte

doi:10.1021/bk-2004-0881.ch003

Cited by 31 publications

(29 citation statements)

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“…The value of the backscattered radiation is related to the photon transport mean free path l ∗, which represents the mean free path run by the photons before losing the direction of the incident light. Considering a narrow area with a differential thickness, d h , like that in the measuring system, the BS can be expressed as [41]: The ΔBS parameter was evaluated in three different height positions of the cell. In the middle part, BS variations involve changes in particle size, whereas ΔBS and ΔTS in the upper and lower part of the cell provide information about migration, sedimentation and creaming phenomena [42].…”

Section: Resultsmentioning

confidence: 99%

“…In figure 6(a) the % BS vs cell height (2–12 mm), after different days of dispersion preparation, was plotted for both base oils. As can be seen, the behavior of these systems does not follow the Mie theory [41], which explains the classical sedimentation phenomenon: BS increase in the lower part of the cell as a consequence of the increment in the concentration of the dispersed phase (sediment) and a simultaneous decrease in the upper part of the cell as a consequence of the clarification phenomenon.…”

Section: Resultsmentioning

confidence: 99%

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Engineered silica nanoparticles as additives in lubricant oils

López

González

Reguero

et al. 2015

Science and Technology of Advanced Materials

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Silica nanoparticles (SiO2 NPs) synthesized by the sol–gel approach were engineered for size and surface properties by grafting hydrophobic chains to prevent their aggregation and facilitate their contact with the phase boundary, thus improving their dispersibility in lubricant base oils. The surface modification was performed by covalent binding of long chain alkyl functionalities using lauric acid and decanoyl chloride to the SiO2 NP surface. The hybrid SiO2 NPs were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, simultaneous differential thermal analysis, nuclear magnetic resonance and dynamic light scattering, while their dispersion in two base oils was studied by static multiple light scattering at low (0.01% w/v) and high (0.50%w/v) concentrations. The nature of the functional layer and the functionalization degree seemed to be directly involved in the stability of the suspensions. The potential use of the functional SiO2 NPs as lubricant additives in base oils, specially designed for being used in hydraulic circuits, has been outlined by analyzing the tribological properties of the dispersions. The dendritic structure of the external layer played a key role in the tribological characteristics of the material by reducing the friction coefficient and wear. These nanoparticles reduce drastically the waste of energy in friction processes and are more environmentally friendly than other additives.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Engineered silica nanoparticles as additives in lubricant oils

López

González

Reguero

et al. 2015

Science and Technology of Advanced Materials

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“…On the other hand, NaCAS–GA mixture exhibited a significant decrease of BS, being more pronounced between the 32 and 48 hr to finally stabilize at 56 hr of reaction (from 7.5% to 4%). According to the Mie scattering model for particles smaller than the incident wavelength (λ = 880 nm), a decrease of backscattered light flux entails a decrease of particle mean diameter (Bru et al., ). These results are in agreement with Davidov‐Pardo et al.…”

Section: Resultsmentioning

confidence: 99%

Attenuated Total Reflectance Fourier Transform Midinfrared Spectroscopy Combined with Multivariate Analysis, a Novel Approach to Monitor Maillard Reaction

Mellado-Carretero

Kaade

Ferrando

et al. 2019

Journal of Food Science

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The aim of this work was to study the potential of using infrared spectroscopy and chemometrics to monitor Maillard reaction. Sodium caseinate (NaCAS) and gum Arabic (GA) or sodium carboxymethyl cellulose (CMC) powders were mixed at 1:1, spray‐dried, and incubated at 60 °C and 76% of relative humidity from 0 to 72 hr. Sample infrared spectra were collected, and browning degree, conjugation efficiency, and stabilization properties of the conjugates were analyzed by spectrophotometry, fluorescence spectroscopy, turbidity, and zeta potential measurements. Pairwise soft independent modeling of class analogy (SIMCA) models showed significant chemical differences among NaCAS–GA mixtures incubated for 0 (Control) and 16 hr, attributed to functional groups linked to different Maillard reaction products such as Schiff's base and pyridine compounds. Infrared spectroscopy combined with SIMCA is a powerful tool to monitor the formation of protein–polysaccharide conjugates by Maillard reaction. Practical Application Protein–polysaccharide conjugates obtained by Maillard reaction are currently used as novel food emulsifiers. However, conventional methods to study this chemical reaction are time consuming or involve the use of toxic and harmful reactants. Infrared spectroscopy combined with multivariate analysis is evaluated to be used as a rapid tool to monitor Maillard reaction.

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“…(12)- (15) Eqs. (17) and ( Drag corrective coefficient for permeable agglomerates (-) Ω S Drag corrective coefficient based on structure of agglomerate (−) ψ…”

Section: Resultsmentioning

confidence: 99%

“…The fundamentals and principles of the Turbiscan MA 2000 device are well exposed, respectively, in Bru et al [17] , Mengual et al [18], and Snabre & Arhaliass's [19] works. In this section, we restrict our attention to the operating principle Fig.…”

Section: Methods: Turbiscan Ma 2000mentioning

confidence: 99%

Determination of the characteristics of agglomerates in aqueous suspensions using nonlinear optimization

Bongono¹,

Azéma²,

Johannet³

et al. 2011

Powder Technology

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Measurement of characteristics of particles in suspensions without dilution has a practical interest in formulation, mineral processing, material sciences and environmental technologies. These characteristics are the size, shape, and surface properties of the primary particles, and also the size, structure and the number of primary particles in the agglomerates. In this work, the multiple light-scattering model through the optical analyzer, Turbiscan MA 2000 is used to determine the mean settling velocities of monodisperse glass beads and two polydisperse samples of powders, kaolin D and alumina, differing by their particle size distribution, their shape and their surface properties. Beyond the experimental validation of theoretical and empirical predictions, the nonlinear adjustment of experimental settling data gives the number of primary particles per agglomerate and the agglomerate size. These two characteristics lead to the determination of the fractal dimension of the agglomerates. The latter was found in the range of 2.5-2.7 for all suspensions examined. The calculation of permeability and spherical factor reveals the nonspherical impermeable agglomerates.

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Particle Size and Rapid Stability Analyses of Concentrated Dispersions: Use of Multiple Light Scattering Technique

Cited by 31 publications

References 1 publication

Engineered silica nanoparticles as additives in lubricant oils

Engineered silica nanoparticles as additives in lubricant oils

Attenuated Total Reflectance Fourier Transform Midinfrared Spectroscopy Combined with Multivariate Analysis, a Novel Approach to Monitor Maillard Reaction

Determination of the characteristics of agglomerates in aqueous suspensions using nonlinear optimization

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