Solubility of Oleic and Linoleic Acids in Subcritical Water

Khuwijitjaru, Pramote; Kimura, Yukitaka; Matsuno, Ryuichi; Adachi, Shuji

doi:10.3136/fstr.10.261

Cited by 24 publications

(16 citation statements)

References 6 publications

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“…The k u values obtained here can be compared to values reported in the literature for relatively simple substrates, such as methyl formate and ethyl formate (36) , ethyl acetate (12) , several aliphatic methyl and butyl esters with carboxylate group ranging from 8 to 16 carbons (37) , prepolymers for UP resins (38) , PLA (39) and other aliphatic polyesters (40) , and a polyester urethane (41) . The k u values were deduced by using simple assumptions (first order kinetics for ester consumption at low conversion rate) and are plotted in Fig.…”

Section: Discussionmentioning

confidence: 99%

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Crosslink Density Changes during the Hydrolysis of Tridimensional Polyesters

Richaud

Pierre

Coquillat

et al. 2014

Macro Theory & Simulations

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. The hydrolysis of almost ideal networks based on macrodiols (poly(adipate of ethylene glycol)) of average molar mass about 2 kg/mol, with L=18 ester groups per chain has been studied. Tensile testing was used to evaluate the crosslink density through the statistical theory of rubber elasticity at two temperatures and three values of relative humidity. A kinetic model for ester consumption including an autocatalysis term was proposed and combined with two original approaches for modeling the crosslink density changes. This allowed kinetic parameters of hydrolysis to be determined, and very good predictions were obtained for the variations of crosslink density (or elastic modulus) in the three aging conditions considered.The initial curvature of elastic modulus vs. time was predicted positive for weak autocatalysis and negative for strong autocatalysis. The obtained conversion ratio at degelation was found to decrease sharply with the number of esters per elastically active chain.

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Section: Discussionmentioning

confidence: 99%

“…Some k u and k c values have been reported in the literature for auto-catalyzed hydrolyses (12,(36)(37)(38)(39)(40)(41)(42) . For instance, Krammer and Vogel (12) presented a plot for the hydrolysis of ethyl acetate, which displays a curvature from which A can be assessed by using (11) and the time for consuming half the initial esters.…”

Section: Figurementioning

confidence: 99%

Crosslink Density Changes during the Hydrolysis of Tridimensional Polyesters

Richaud

Pierre

Coquillat

et al. 2014

Macro Theory & Simulations

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“…C 5 H 11 COO À + H 3 O + ) almost all HA molecules carry a single negative net charge at the given pH value. Secondly, we choose stearic acid (SA, C 18 H 36 O 2 ), a long-chain fatty acid with a very low solubility in water (smaller than 1 mM [30]). As a result of the formation of premicellar aggregates, the pK a value of SA strongly depends on its concentration.…”

Section: à2mentioning

confidence: 99%

An Electrochemical Transducer Based on a Pentacene Double‐Gate Thin‐Film Transistor

2012

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We report an electrochemical transducer based on an organic double-gate transistor. The bottom-gate is given by a p-doped silicon substrate, which is covered by 300 nm thermal oxide. A 20 nm pentacene film acts as the semiconducting layer, and a 50 nm tetratetracontane (TTC) alkane film is used as a top-gate dielectric. An aqueous ionic solution acts as top-gate. We record the transistor transfer characteristics by variation of the electrolyte potential via a Ag/AgCl electrode for various bottom-gate settings. A change of the electrolyte potential results in a change of the transistor current and the characteristic behaviour of the device is in good agreement with the expected behaviour of a double-gate transistor. The top-gate capacitance of the alkane layer is as high as 2.6 10 À8 F cm À2 determined by impedance measurements, indicating that TTC is a good choice as an organic top-gate dielectric. The suitability of this transducer configuration for sensing in aqueous media is demonstrated by the detection of hexanoic acid and stearic acid molecules adsorbing to the alkane interface, respectively. We show that the transducer easily achieves a concentration sensitivity in the range of 100 nM.

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“…We measured their solubility in the temperature range from 60 to 230 1C, and showed that their solubility at 200 1C or higher temperatures was hundreds-fold or a thousand-fold higher than that at ambient temperature (Khuwijitjaru, Adachi, & Matsuno, 2002;Khuwijitjaru, Kimura, Adachi, & Matsuno, 2004a). Based on these measurements, we devised a novel method to prepare a finely dispersed oil-inwater (O/W) emulsion by mixing water containing a dissolved fatty acid at a high temperature and a surfactant solution, and confirmed the realization of the method (Khuwijitjaru, Kimura, Matsuno, & Adachi, 2004b).…”

Section: Introductionmentioning

confidence: 99%