Effect of oleic acid on the stability and rheology of nanoaluminium/JP‐10 bi‐phase system

2017 ◽  
Vol 12 (9) ◽  
pp. 675-679 ◽  
Author(s):  
Bing Hong Chen ◽  
Jian Zhong Liu ◽  
Feng Yao ◽  
He Ping Li ◽  
Jun Hu Zhou
Keyword(s):  
Oleic Acid ◽  
Phase System ◽  
The Stability

The effect of oleic acid on the stability of magnetite ferrofluid

1995 ◽  
Vol 31 (6) ◽  
pp. 4178-4180 ◽  
Author(s):  
M.S. Dababneh ◽  
N.Y. Ayoub
Keyword(s):  
Oleic Acid ◽  
The Stability

scholarly journals Effect of pH on the stability of quartz in a multi-phase system of kaolinite, hydrous Al (hydr)oxide and quartz

2019 ◽  
Vol 1 (5) ◽  
Author(s):  
Abdullah Musa Ali ◽  
Eswaran Padmanabhan ◽  
Abubakar Mijinyawa ◽  
Mohammed Yerima Kwaya
Keyword(s):  
Phase System ◽  
Effect Of Ph ◽  
The Stability ◽  
Multi Phase

scholarly journals Hydrosilylation of Reactive Quantum Dots and Siloxanes for Stable Quantum Dot Films

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 905
Author(s):  
Changmin Lee ◽  
Eunhee Nam ◽  
Woosuk Lee ◽  
Heeyeop Chae
Keyword(s):  
Quantum Dots ◽  
Oleic Acid ◽  
Nucleophilic Addition ◽  
Addition Reaction ◽  
Light Emitting Diode ◽  
Molecular Structures ◽  
One Pot ◽  
Nucleophilic Addition Reaction ◽  
The Stability ◽  
Photo Stability

The reactive acrylate-terminated CdZnSeS/ZnS quantum dots (QDs) were designed and prepared by the effective synthetic route to bond with a siloxane matrix via hydrosilylation. The conventional QD with oleic acid ligands does not have any reactivity, so the QDs were functionalized to assign reactivity for the QDs by the ligand modification of two step reactions. The oleic acid of the QDs was exchanged for hydroxyl-terminated ligands as an intermediate product by one-pot reaction. The hydroxyl-terminated QDs and acrylate-containing isocyanates were combined by nucleophilic addition reaction with forming urethane bonds and terminal acrylate groups. No degradation in quantum yield was observed after ligand exchange, nor following the nucleophilic addition reaction. The modification reactions of ligands were quantitatively controlled and their molecular structures were precisely confirmed by FT-IR and 1H-NMR. The QDs with acrylate ligands were then reacted with hydride-terminated polydimethylsiloxane (H-PDMS) to form a QD-siloxane matrix by thermal curing via hydro-silylation for the first time. The covalent bonding between the QDs and the siloxane matrix led to improvements in the stability against oxygen and moisture. Stability at 85 °C and 85% relative humidity (RH) were both improved by 22% for the QD-connected siloxane QD films compared with the corresponding values for conventional QD-embedded poly(methylmethacrylate) (PMMA) films. The photo-stability of the QD film after 26 h under a blue light-emitting diode (LED) was also improved by 45% in comparison with those of conventional QD-embedded PMMA films.

scholarly journals Asymptotic Stability of the Golden-Section Control Law for Multi-Input and Multi-Output Linear Systems

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Duo-Qing Sun ◽  
Zhu-Mei Sun
Keyword(s):  
Asymptotic Stability ◽  
Linear Systems ◽  
Golden Section ◽  
Stability Result ◽  
Least Square ◽  
Control Law ◽  
Phase System ◽  
Characteristic Model ◽  
Model Based ◽  
The Stability

This paper is concerned with the problem of the asymptotic stability of the characteristic model-based golden-section control law for multi-input and multi-output linear systems. First, by choosing a set of polynomial matrices of the objective function of the generalized least-square control, we prove that the control law of the generalized least square can become the characteristic model-based golden-section control law. Then, based on both the stability result of the generalized least-square control system and the stability theory of matrix polynomial, the asymptotic stability of the closed loop system for the characteristic model under the control of the golden-section control law is proved for minimum phase system.

On the Equilibrium of Cavitation Nuclei in Liquid-Gas Solutions

1981 ◽  
Vol 103 (3) ◽  
pp. 425-430 ◽  
Author(s):  
Y. S. Cha
Keyword(s):  
Stable Equilibrium ◽  
Thermodynamic Theory ◽  
Phase System ◽  
Saturated Liquid ◽  
Theoretical Justification ◽  
Two Phase ◽  
System Pressure ◽  
Two Component ◽  
Cavitation Nuclei ◽  
The Stability

The stability of a spherical bubble in a two-component two-phase system is examined by employing the thermodynamic theory of dilute solutions. It is shown that a bubble can remain in a state of stable equilibrium provided that the ratio of the total number of moles of the solute to the total number of moles of the solvent in the system is not extremely small and that the system pressure falls between an upper bound (dissolution limit) and a lower bound (cavitation limit). The results of the analysis provide a theoretical basis for the persistence of microbubbles in a saturated liquid-gas solution. Thus to a certain extent, the results also help to resolve the dilemma that exists in the field of cavitation due to (1) the necessity of postulating the existence of microbubbles; and (2) the lack of theoretical justification for the persistence of such bubbles in a liquid.

scholarly journals Studies on Paliperidone in OROS Tablets: Extraction Procedure and Chromatographic Analysis

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Fábio Barbosa ◽  
Luciano Mantovani ◽  
Cássia V. Garcia ◽  
Andreas S. L. Mendez
Keyword(s):  
Oral Delivery ◽  
Degradation Products ◽  
Extraction Procedure ◽  
Reversed Phase ◽  
Forced Degradation ◽  
Phase System ◽  
Stability Indicating ◽  
Ultrasonic Bath ◽  
The Stability ◽  
Liquid Chromatographic

A stability-indicating liquid chromatographic (LC) method was studied for the determination of paliperidone in osmotic-controlled release oral delivery system (OROS) tablets. A tablet extraction procedure was developed by testing the efficiency of solvents (water, HCl, NaOH, acetonitrile, methanol) and techniques (ultrasonic bath, magnetic stirrer), and evaluating the release of the drug with respect to time. A forced degradation study was conducted to demonstrate the stability-indicating power of the method. Chromatographic separation was achieved using an isocratic elution in a reversed-phase system with a mobile phase prepared from a mixture of phosphate buffer and acetonitrile. The use of an ultrasonic bath demonstrated paliperidone release from OROS tablets in a total time of 60 min. Verifying the efficiency of the chromatographic procedure, the theoretical plates (N=12634.21) and tailing factor (tf=1.31) were constant during repeated injections. The retention time of paliperidone was 4.8 min, and the method was validated within the concentration range of 10–50 μg mL-1 (r=0.9999). Adequate reproducibility (RSD% = 0.30–0.59), interday precision (RSD%=1.81), and accuracy were obtained. The proposed method was successfully applied to paliperidone determination in the presence of degradation products, and an efficient extraction procedure from the OROS tablets was developed.

scholarly journals Stability studies of mefenamic acid Self-Nanoemulsifying Drug Delivery System (SNEEDS) preparation with oleic acid as the oil phase

2020 ◽  
Vol 16 (2) ◽  
pp. 130-143
Author(s):  
Yandi Syukri ◽  
Septiani Eka Cahyani ◽  
Bambang Hernawan Nugroho
Keyword(s):  
Oleic Acid ◽  
Mefenamic Acid ◽  
Tween 80 ◽  
Stability Studies ◽  
Storage Test ◽  
Peg 400 ◽  
Accelerated Storage ◽  
The Stability ◽  
Accelerated Storage Test

Background: Mefenamic acid is a non-steroidal anti-inflammatory drug (NSAID) with low solubility in water. Self-Nanoemulsifying Drug Delivery Systems (SNEDDS) play a role to improve the solubility and bioavailability of mefenamic acid. Objective: This study aimed to determine the stability of mefenamic acid in SNEDDS formulation through various stability studies. Methods: The stability studies conducted consisted of centrifugation test, heating-cooling cycle test, freezethaw cycle test, robustness to dilution, accelerated storage test, and determination of drug content. Results: The centrifugation test, heating-cooling cycle test, and freeze-thaw cycle test showed no phase separation in the samples. The robustness to dilution and accelerated storage test resulted in 2 formulas of mefenamic acid loaded SNEDDS having good stability with 10% oleic acid, 80% tween 80, 10% PEG 400 and 10% oleic acid, 70% tween 80, 20% PEG 400. The determination of drug content in both of these formulations showed 98.20 ± 0.04% and 90.98 ± 0.06%. Conclusion: The SNEDDS formulation of mefenamic acid in this study had good stability. Keywords: SNEDDS, mefenamic acid, stability study, oleic acid

Influence of HLB Parameters of Surfactants on Properties of Magneto-Rheological Fluid

2010 ◽  
Vol 97-101 ◽  
pp. 843-847 ◽  
Author(s):  
Cheng Bin Du ◽  
Wei Qing Chen ◽  
Fa Xue Wan
Keyword(s):  
Magnetic Properties ◽  
Oleic Acid ◽  
Polyethylene Glycol ◽  
Rheological Properties ◽  
Magnetic Particles ◽  
Hydrophilic Lipophilic Balance ◽  
The Stability ◽  
Magneto Rheological

The hydrophilic-lipophilic balance (HLB) parameters of surfactants have a significant effect on properties of surfactants and determine the effects of surfactants. The magneto-rheological fluid (MRF) is prepared by using the two typical HLB parameters of surfactants including Polyethylene Glycol and oleic acid in order to improve the property of MRF. Polyethylene Glycol (PEG) whose HLB parameter is 20 has strong hydrophilic. Oleic acid whose HLB parameter is 1 has strong lipophilic. The results indicate that magnetic properties of magnetic particles and rheological properties of MRF can hardly be changed by adding surfactants. The sedimentary stability of MRF adding lipophilic surfactants is superior to that of MRF adding hydrophilic surfactants, and the stability of MRF adding two surfactants increases significantly.

Epoxidation of oleic acid catalyzed by peroxo phosphotungstate in a two-phase system

1998 ◽  
Vol 134 (1-3) ◽  
pp. 223-228 ◽  
Author(s):  
I.V. Kozhevnikov ◽  
G.P. Mulder ◽  
M.C. Steverink-de Zoete ◽  
M.G. Oostwal
Keyword(s):  
Oleic Acid ◽  
Phase System ◽  
Two Phase ◽  
Acid Catalyzed
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