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Han Y.,CAS Chengdu Institute of Organic Chemistry | Han Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Chu Z.,CAS Chengdu Institute of Organic Chemistry | Sun H.,Sinopec | And 3 more authors.
RSC Advances | Year: 2012

In such application fields as oilwell stimulation, tertiary oil recovery and drug release, environmental-friendly wormlike micelles are largely preferred. The present work reports a "green" wormlike micellar system formed by a bio-based anionic surfactant, sodium erucate (NaOEr), and a biodegradable hydrotrope, choline. The micellar solutions were examined by means of rheology and cryo-TEM observation. Besides possessing lower toxicity, choline exhibits a stronger ability to induce micelle growth than tetramethylammonium, which is commonly used to promote the formation of anionic worms, and the choline-NaOEr system is more thermosensitive with increasing counterion concentration. These notable advantages enable the choline-NaOEr wormlike micellar system to find potential applications in biomedical areas and clean fracturing fluids. © 2012 The Royal Society of Chemistry.


Han Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Wei Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Wang H.,Second Research Institute of Civil Aviation Administration of China CAAC | Mei Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Zhou H.,Second Research Institute of Civil Aviation Administration of China CAAC
Journal of Surfactants and Detergents | Year: 2013

Rheological measurements were performed to understand the effect of benzyltrimethyl ammonium bromide (BTAB) and NaBr on the growth of wormlike micelles formed by sodium oleate (NaOA). Both salts can make the micellar solution viscoelastic, and the rheological responses verify the formation of wormlike micelles. The viscoelastic solution follows the Maxwell model of a single stress relaxation mode in the low-frequency region. In comparison, the BTAB system exhibits stronger viscoelasticity than the NaBr system at constant salt concentration, but the critical overlapping concentration shows no significant difference; less BTAB can induce the solution to be more viscous than NaBr, but the viscosity maximum of the BTAB system is remarkably lower than that of NaBr at fixed NaOA content. The puzzling result is attributed to the effect of the composition on the packing parameter. In addition, it is shown that the zero-shear viscosity of the two salt systems decreases upon heating, following the Arrhenius mode well. © 2012 AOCS.


Zhou H.,Second Research Institute of Civil Aviation Administration of China CAAC | Mei Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Wang H.,Second Research Institute of Civil Aviation Administration of China CAAC
Journal of Macromolecular Science, Part B: Physics | Year: 2010

A hydrophobically modified poly(acrylic acid) (HMPA) with twin-tailed hydrophobic pendant side groups was prepared by precipitation polymerization. The rheology behavior of HMPA was examined in mixtures of water and ethylene glycol (EG) of different proportions. It was shown that the solvent had a direct impact on both the steady and dynamic rheology behaviors of the HMPA solutions. The change of hydrophobic interactions in the EG-rich mixtures may be attributed to the observed decrease in polymer coil dimension together with a lower tendency of the hydrophobes to form junctions. As the temperature decreased, the viscosities and numbers of active junctions of HMPA in water-EG mixtures increased. Copyright © 2010 Taylor & Francis Group, LLC.


Li J.,Second Research Institute of Civil Aviation Administration of China CAAC | Wang G.Q.,Second Research Institute of Civil Aviation Administration of China CAAC | Zhu P.,Second Research Institute of Civil Aviation Administration of China CAAC | Lu X.,Guilin Air Traffic Management Station of Civil Aviation of China | Su J.,Guilin Air Traffic Management Station of Civil Aviation of China
MATEC Web of Conferences | Year: 2016

A-SMGCS is a modular system defined in the ICAO (International Civil Aviation Organization) Manual on Advanced Surface Movement Guidance and Control System (A-SMGCS).One of A-SMGCS goals is to provide enhanced safety and protection of the runway. This paper presents a novel runway incursion detection approach for A-SMGCS, in which a multiple protected area is proposed to decrease complexity of pre-Treatment for incursion judgment, and a flight status machine is designed to specify the transitions of one flight from one target status to another. Additionally, an HMI (Human Machine Interface) independently developed by the Second Research Institute of CAAC (Civil Aviation Administration of China) was designed in order to validate the runway incursion detection approach, the result shows that the algorithm has the potential to significantly improve runway safety by early detection and alerting of runway incursions. © Owned by the authors, published by EDP Sciences, 2016.


Zhou H.,Second Research Institute of Civil Aviation Administration of China CAAC | Han Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Wei Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Wang H.,Second Research Institute of Civil Aviation Administration of China CAAC | Mei Y.,Second Research Institute of Civil Aviation Administration of China CAAC
Journal of Molecular Liquids | Year: 2016

Wormlike micelles (WLMs) are prepared in ethylene glycol (EG)-aqueous mixed solution. Gemini surfactant, 2-hydroxyl-propanediyl- α,ω -bis-(dimethyldodecylammonium bromide) and sodium benzoate were used, referred as 12-3(OH)-12 and NaBen respectively, to construct WLMs. The effect of EG on WLMs was investigated by rheological measurements. Steady rheological responses of mixed solution slide down like a terrace with the displacement of water by EG. Dynamic rheology spectra shift towards high angular frequency and the mixture transformed from viscoelastic to less viscous fluid. The addition of NaBen into 12-3(OH)-12 solution causes similar salt effect within different EG content. However, the peaks of viscosity and relaxation time both shifts towards high NaBen concentration and the maximum values decreases one order of magnitude when EG content varying from 0% to 20%. All rheological behaviors were investigated below room temperature. The results show that the WLMs system still keeps desirable rheological properties in EG-water system. The evolution of sample viscosity upon temperature conforms to Arrhenius law. The study provides deep comprehension on the self-assembly behavior of WLMs in low-temperature region. © 2016 Elsevier B.V. All rights reserved.


Yixiu H.,Second Research Institute of Civil Aviation Administration of China CAAC | Hong Z.,Second Research Institute of Civil Aviation Administration of China CAAC | Yongqiang W.,Second Research Institute of Civil Aviation Administration of China CAAC | Yongjun M.,Second Research Institute of Civil Aviation Administration of China CAAC | Hang W.,Second Research Institute of Civil Aviation Administration of China CAAC
Journal of Molecular Liquids | Year: 2015

Abstract Rheological experiments were carried out on wormlike micelle formed by C22-tailed anionic surfactant sodium erucate (NaOEr) in the presence of KCl or tetramethyl ammonium bromide (TMAB). The effects of salt and surfactant concentration are systematically investigated at 80°C. Two kinds of salt-based micelle systems both maintain strong rheological properties at high temperature. By comparison, KCl-NaOEr system possesses lower critical overlapping concentration, stronger viscosity, and threshold salt concentration. Obviously, KCl shows high efficiency than TMAB in favoring micelle growth and improving the viscoelasticity of solution. The steric hindrance should be responsible for the inefficiency of TMAB compared to KCl. The extra-long hydrophobic chain of NaOEr is responsible for the desirable thermostability. © 2015 Elsevier B.V.


Yongqiang W.,Second Research Institute of Civil Aviation Administration of China CAAC | Yixiu H.,Second Research Institute of Civil Aviation Administration of China CAAC | Hong Z.,Second Research Institute of Civil Aviation Administration of China CAAC | Ke W.,University of Sichuan | And 2 more authors.
Journal of Solution Chemistry | Year: 2015

Abstract The interactions between hydrophobically modified polyacrylic acid (HMPAA) and wormlike micelles (worms) were investigated by a well-designed rheological measurement procedure. For worms formed by sodium oleate and benzyltrimethylammonium bromide, remarkable rheology enhancement was observed once a small amount of HMPAA was introduced. Moduli enhancement and varied shear thickening or hysteresis behaviors were observed with changing HMPAA content of the mixture. Only at low HMPA content and low shear rate was shear-thickening observed. With the support of DPD simulation, it was found that low-rate shear can induce a coil-to-bridge transition of HMPAA conformation at low concentration. The relationship between the network structure and rheological properties are discussed. The transition of aggregation modes and the enrichment of the network should be responsible for the enhancement of the rheology. © 2015 Springer Science+Business Media New York.


Hong Z.,Second Research Institute of Civil Aviation Administration of China CAAC | Yongjun M.,Second Research Institute of Civil Aviation Administration of China CAAC | Hang W.,Second Research Institute of Civil Aviation Administration of China CAAC | Lin X.,Second Research Institute of Civil Aviation Administration of China CAAC
Journal of Solution Chemistry | Year: 2010

Hydrophobically modified poly(acrylic acid) (HMPA) with single-tailed pendant side groups was prepared by precipitation polymerization. The effects of polymer concentration, surfactant and co-solvent on the solution properties of HMPA were investigated. HMPA solutions showed good viscosity enhancement and typical shear thinning behavior with increasing concentration. The surfactant TX-10 and co-solvent ethylene glycol gave rise to factors that changed the hydrophobic interactions and in turn the rheology behavior of the solutions. The transient associative network of HMPA in ethylene glycol + water mixed solutions was retained as the temperature was decreased to below 0∈°C. © 2010 Springer Science+Business Media, LLC.


Zhou H.,Second Research Institute of Civil Aviation Administration of China CAAC | Han Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Mei Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Wei Y.,Second Research Institute of Civil Aviation Administration of China CAAC | Wang H.,Second Research Institute of Civil Aviation Administration of China CAAC
Journal of Polymer Research | Year: 2014

The response behaviors of a mixed solution of polyelectrolytes and wormlike micelles have seldom been noticed. This paper reports rheological synergism between wormlike micelles and hydrophobically modified polyacrylic acid (HMPAA) or polyacrylic acid (PAA). The anionic, wormlike micelle system of sodium oleate (NaOA) and a hydrotrope, benzyltrimethylammonium bromide (BTAB), was exemplified in our study. Under tuned shear conditions, the following phenomena are observed successively: rheology enhancement, shear hysteresis, shear thickening, and moduli increase upon the addition of PAA or HMPAA into wormlike micelles. There is no apparent difference at low polymer concentrations between PAA- and HMPAA-based mixed systems. Remarkable contrast on rheological responses occurs at high polymer concentrations. Combined with rheological responses, the interaction mechanism is further probed by dissipative particle dynamics simulation. Entanglement between wormlike micelles and polyelectrolytes dominantly constitutes the enrichment of the network at a low polymer concentration. Hydrophobic association originating from HMPAA plays a decisive role in its superiority over a PAA system of higher concentration. Moreover, the high salinity made an adverse impact on the stretching of the PAA backbone, which aggravates the decline of synergism. © 2014 Springer Science+Business Media Dordrecht.

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