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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and electrorheological characterization of emulsion-polymerized dodecylbenzenesulfonic acid doped polyaniline-based suspensions (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 894-898 
    Details
    ISSN: 1435-1536
    Keywords: Key words Electrorheological fluid ; Polyaniline ; Emulsion polymerization ; Dodecylbenzenesulfonic acid ; Suspension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrorheological (ER) properties of dodecylbenzenesulfonic acid (DBSA) doped polyaniline suspensions in silicone oil were investigated. In contrast to chemically polymerized polyaniline in an acidic aqueous medium by oxidation polymerization, we adopted an emulsion polymerization technique in which aniline is polymerized in an emulsion of water and a nonpolar (or weakly polar) organic solvent. The effects of electric field strength and particle concentration on the ER properties of DBSA-doped polyaniline suspensions in silicone oil were then examined. Rheological measurements were also carried out using a rotational rheometer with a high-voltage generator in both controlled shear rate and shear stress modes, and the results showed that the ER properties were enhanced by increasing the particle concentration and electric field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960000360
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  • 2
    Electronic Resource
    Electronic Resource
    Clinical characteristics of Peutz-Jeghers syndrome in Korean polyposis patients (2000)
    Springer
    International journal of colorectal disease 15 (2000), S. 35-38 
    Details
    ISSN: 1432-1262
    Keywords: Keywords Peutz-Jeghers syndrome ; Hamartomatous polyps ; Intussusception ; Cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Peutz-Jeghers syndrome is an autosomal dominant inherited disorder characterized by hamartomatous polyps in the small bowel and mucocutaneous pigmentation. Patients with Peutz-Jeghers syndrome often present as surgical emergencies with complications of the polyps, such as intussusception, bowel obstruction, and bleeding. Recently an increased risk of malignancies has also been reported. This study was initiated to determine the clinical features of Peutz-Jeghers syndrome in Korean patients, with special attention to the development of malignancies. Thirty patients with Peutz-Jeghers syndrome were investigated; their median age was 23.5 years, and symptoms appeared at a median age of 12.5 years. Family history was positive in one-half of cases, and mucocutaneous pigmentation was observed in almost all patients (93%). The jejunoileum was the most frequent site of the polyps, and there were generally 10–100 polyps. Multiple laparotomies were performed in a substantial portion of the patients, due mainly to polyp-induced bowel obstruction, and the surgical interventions were begun at a relatively young age (average 21.4 years). Four cases of small-bowel cancer and one case of breast cancer were detected in probands, at a relatively young age (mean 36 years). Cancers of the small bowel, stomach, colon, breast and cervix were diagnosed in the first relatives of the probands. Close follow-up from an early age should thus be performed in patients with Peutz-Jeghers syndrome as they are at high risk of surgical emergency and development of malignancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003840050005
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of polymerization temperature on polyaniline based electrorheological suspensions (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 73-76 
    Details
    ISSN: 1435-1536
    Keywords: Key words Electrorheological fluid ; Polyaniline ; Dielectric spectrum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract As one of the intrinsically polarizable materials used in electrorheological (ER) fluid, polyaniline was synthesized by the chemical oxidation of aniline with ammonium peroxysulfate. ER fluids were prepared by dispersing polyaniline particles in silicone oil, and their rheological properties were measured. The effect of the polymerization temperature of polyaniline on its ER characteristics was investigated. ER fluids with polyaniline particles synthesized at −10°C (PA-10) showed the best ER performance (yield stress) compared with those synthesized at higher temperatures. A difference in the flow behavior of the ER fluids was also investigated through the dielectric spectra of ER fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050369
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  • 4
    Electronic Resource
    Electronic Resource
    Electrorheological characteristics of polyaniline and its copolymer suspensions with ionic and nonionic substituents (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 61-64 
    Details
    ISSN: 1435-1536
    Keywords: Key words Electrorheological fluid ; N-substituted copolyaniline ; Polyaniline ; Poly(aniline-co-o-ethoxyaniline)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Electrorheological (ER) characteristics of ER fluids, composed of suspensions of semiconducting polyaniline and two different copolyaniline particles in silicone oil, were determined experimentally. Ionic sodium diphenylamine sulfonate and nonionic o-ethoxyaniline were used to synthesize copolyanilines, i.e. N-substituted copolyaniline and poly(aniline-co-o-ethoxyaniline), respectively. ER fluids composed of these three different polymers were compared with respect to their rheological properties under an applied electric field. It was found that ER fluids containing a copolymer with an ionic group exhibited the highest ER performance among polyaniline and its copolymer systems in a shear-rate region above 1 s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050009
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  • 5
    Electronic Resource
    Electronic Resource
    On the steady simple shear flows of the one-mode Giesekus fluid (1989)
    Springer
    Rheologica acta 28 (1989), S. 13-24 
    Details
    ISSN: 1435-1528
    Keywords: One-modeGiesekus model ; mobility parameter ; Weissenberg number ; Couette flow ; Poiseuille flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Analytical solutions for the plane Couette flow and the plane Poiseuille flow of the one-mode Giesekus fluid without any retardation time have been obtained by considering the domain of definition for each of the two branch solutions which arise due to the presence of the quadratic stress terms in the constitutive equations. For each fixed value of the mobility parametera, the limiting value of the Weissenberg number for the upper branch solution, i.e., the physically realistic solution is determined in terms of the corresponding dimensionless shear stress for the plane Couette flow and in terms of the corresponding dimensionless pressure gradient for the plane Poiseuille flow. In the case of the plane Couette flow, it is shown that fora falling in the range 0≤a≤1/2 only the physically realistic solution exists while for 1/2〈a ≤1 a nonphysical solution coexists with the realistic one. In the case of the plane Poiseuille flow, it is shown that the non-physical solution cannot even exist around the center plane of the channel, and the effects of the mobility parameter and the dimensionless pressure gradient on the flow variables are investigated. Possible extensions of the present approach to other steady simple shear flows with and without the introduction of the retardation time are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01354764
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    Paper (German National Licenses)
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