Adsorption of Oleic Acid at Sillimanite/Water Interface

Kumar, T Vijaya; Prabhakar, S.; Raju, G Bhaskar

doi:10.1006/jcis.2001.8131

Cited by 61 publications

(35 citation statements)

References 13 publications

(7 reference statements)

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“…The value of κ a is much smaller than κ s , implying that the stearate-alumina interactions are much stronger that the interactions between the solution and surface stearate molecules (the stearate molecules adsorbed on the surface). This is in agreement with the literature which have suggested that the stearate adsorption is multilayer in nature and that the initial layer adsorbs strongly by chemical bonding followed by additional weakly bonded layers [36][37][38][39][40][41][42].…”

Section: Resultssupporting

confidence: 93%

“…The pH was adjusted to 9.2 to operate at the pzc of the powder where maximum stearate adsorption was observed [39][40][41][42] and to prevent precipitation of sodium stearate. The solid concentration in each bottle was adjusted to 20 g/L in all experiments.…”

Section: Methodsmentioning

confidence: 99%

“…The model was tested with the sodium stearate/water/α-alumina system for the specific reasons that (i) α-alumina provides essentially a nonporous, homogeneous surface; (ii) the stearate molecules produce multilayers on α-alumina [33][34][35][36]; (iii) adsorption takes place through both chemisorption (the carboxylate-surface hydroxyl bonds) [36][37][38] and physisorption (the stearate-stearate hydrocarbon chain bonds) [35,36,38,[40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

Polat

2006

Journal of Colloid and Interface Science

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A phenomenological multilayer adsorption model for a well-dispersed, homogeneous, nonporous adsorbent and a molecular adsorbate is presented. The model provides explicit kinetic expressions associating the adsorbed amounts to the fraction of the surface occupied and reduces to the first-and second-order adsorption models for special cases. Parameters of the model are a pair of true rate constants related to the adsorbateadsorbent and adsorbate-surface adsorbate affinities. A general graphical procedure and analytical equations for special cases are provided to estimate the rate constants from kinetic adsorption data. Data from the adsorption of sodium stearate onto α-alumina from water were used to test the model. The predicted values of the rate constants suggested that the stearate was distributed homogeneously on the alumina surface and essentially adsorbed as a monolayer before starting to form the second layer.

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Section: Resultssupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

Polat

2006

Journal of Colloid and Interface Science

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“…This behavior is similar to that of sillimanite with oleate. 15) From the amount of adsorption at pH 5.0, an occupation area of one adipic acid molecule is calculated. When adipic acid is presumed to adsorb in a monolayer on the surface of alumina, the occupation area is 0.10 nm 2 .…”

Section: Jcs-japanmentioning

confidence: 99%

“…8)-14) Kumar et al 15) confirmed the chemisorption of oleic acid on the sillimanite by zeta-potential, adsorption isotherm and FT-IR studies. Arenas et al 16) reported two symmetric and asymmetric νC-O bands were explained by the cooperative and opposing movements of the rotated carboxylic groups in the FT-IR and Raman spectroscopic investigation.…”

Section: Introductionmentioning

confidence: 97%

Estimation and confirmation of adsorption behavior of acrylic polymer on alumina from a molecular chemistry standpoint of adipic acid adsorption

Nagata

Yamamoto

2008

J. Ceram. Soc. Japan

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Adsorption of a low molecular carboxylic acid (adipic acid) on alumina was studied at molecular chemistry standpoint to estimate adsorption behavior of an acrylic polymer containing carboxylic acid group in water-base system. By the zeta potential measurement, adipic acid adsorbs on alumina chemically. The maximum amount of adsorption of adipic acid was observed at pH 5, which is close to pKa1 (4.41) and pKa2 (5.28) of adipic acid. In the region over pH 5, the adsorbed amount decreased monotonously with increase of pH. Adsorption behavior of adipic acid is considered by investigating both surface species distribution on alumina (AlOH2 ; X: -OCOC4H8COO-) at various pH. It is supposed that amount of adsorbed adipic acid on alumina is maximum, because the electrostatic attraction between a positive charge of alumina surface and a negative charge of adipic acid is large. By FT-IR analysis of adsorbate, alumina surface reaction with adipic acid produces outer-sphere complex at pH higher than pKa1 of adipic acid. The occupation area of one adipic acid molecule that was calculated from the amount of adsorption agreed with the molecule area estimated by chem-3D simulator. Adipic acid is supposed to be adsorbed on alumina surface perpendicularly in a single molecule layer. Adsorption of acrylic resin on alumina in alkali side was predicted from the knowledge of adsorption behavior of adipic acid. Furthermore, properties of polymer solution, suspension behavior and green sheet were estimated and confirmed. It is found that a molecular chemistry study of adsorption of a low molecular weight carboxylic acid can be adapted to polymer system.

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Effect of oleic acid on improving flame retardancy of brucite in low‐density polyethylene composite

Liu

Xia²,

Otitoju

et al. 2021

J of Applied Polymer Sci

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Brucite was modified with oleic acid (OA) and the effect of OA on flame retardancy of brucite in low-density polyethylene (LDPE) composites was investigated. Fourier transform infrared spectroscopy, X-ray diffraction, and particle size analysis were used to examine the structural changes of the OA modified brucite. Flammability of the LDPE/brucite composites with different OA content was characterized by thermogravimetric analysis, limiting oxygen index (LOI), UL-94 test, and microscale combustion calorimetry. The results showed that when brucite was modified with OA, magnesium oleate was formed on the brucite surface. The brucite particle size and the relative intensity of the (101) diffraction peak of brucite decreased. When the content of OA and brucite in the composite were 6 and 40 phr respectively, the prepared LDPE composite displayed better flame retardancy than the corresponding OA free LDPE composite: the LOI value increased from 22.2% to 24.9%, and the peak heat release rate decreased from 678 to 546 kW/m 2 . The influence of OA on the improvement of flame retardancy of brucite in LDPE/brucite composite was due to the efficient dispersion of brucite in LDPE matrix and the structural changes of brucite, caused by the reaction of OA with brucite.

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Adsorption of Oleic Acid at Sillimanite/Water Interface

Cited by 61 publications

References 13 publications

Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

Kinetic estimation of the adsorbate distribution on the surface from adsorbed amounts

Estimation and confirmation of adsorption behavior of acrylic polymer on alumina from a molecular chemistry standpoint of adipic acid adsorption

Effect of oleic acid on improving flame retardancy of brucite in low‐density polyethylene composite

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