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Effect of the surfactant alkyl chain length on the stabilisation of lyotropic nematic phases

Akpinar, Erol; Canioz, Cihan; Turkmen, Meric; Reis, Dennys; Neto, Antônio Martins Figueiredo

Customer publications

Effect of the surfactant alkyl chain length on the stabilisation of lyotropic nematic phases

Akpinar, Erol; Canioz, Cihan; Turkmen, Meric; Reis, Dennys; Neto, Antônio Martins Figueiredo

Lyotropic quaternary mixtures of potassium alkanoates (KCx) and sodium alkyl sulphates (NaCxS), where x is the number of carbon atoms in their alkyl chains, were prepared to investigate the effect of the surfactant alkyl chain length on the stabilisation of lyotropic nematic phases. The lyotropic mixtures investigated were formed by…
Effect of the presence of strong and weak electrolytes on the existence of uniaxial and biaxial nematic phases in lyotropic mixtures

Akpinar, Erol; Otluoglu, Kemal; Turkmen, Meric; Canioz, Cihan; Reis, Dennys; Neto, Antônio Martins Figueiredo

Customer publications

Effect of the presence of strong and weak electrolytes on the existence of uniaxial and biaxial nematic phases in lyotropic mixtures

Akpinar, Erol; Otluoglu, Kemal; Turkmen, Meric; Canioz, Cihan; Reis, Dennys; Neto, Antônio Martins Figueiredo

The lyotropic mixture of potassium laurate/decanol/water presenting only the uniaxial nematic calamitic phase was doped with one strong (potassium chloride, KCl) and 11 weak electrolytes with phenyl-rings (DL-mandelic acid, benzoic acid, DL-phenyllactic acid, phenylacetic acid, phenol and phenylmethanol) and with cyclohexyl-ring (RS-hexahydromandelic acid, cyclohexanecarboxylic acid,…
Effective enhancement of the creep resistance in isotactic polypropylene by elevated concentrations of DMDBS

Jia, Chenfei; Liao, Xia; Zhu, Jingjun; An, Zhu; Yang, Qi; Li, Guangxian

Customer publications

Effective enhancement of the creep resistance in isotactic polypropylene by elevated concentrations of DMDBS

Jia, Chenfei; Liao, Xia; Zhu, Jingjun; An, Zhu; Yang, Qi; Li, Guangxian

Isotactic polypropylene (iPP) specimens nucleated with different contents of alpha-phase nucleating agent (1,3:2,4-di(3,4-dimethylbenzylidene) sorbitol, trade name DMDBS) were employed to investigate deformation-induced microstructure evolution during creep deformation. Morphological investigations using scanning electron microscopy showed that the crystalline morphology of nucleated iPP is…
Effects of physical crosslinks on the photoresponse of epoxy-based polymers

Victorel, Marianela; Sáiz, Luciana M.; Galante, María J.; Oyanguren, Patricia A.

Customer publications

Effects of physical crosslinks on the photoresponse of epoxy-based polymers

Victorel, Marianela; Sáiz, Luciana M.; Galante, María J.; Oyanguren, Patricia A.

The influence of physical crosslinks on the photoinduced anisotropy in epoxy linear polymers with azobenzene and alkyl side groups was studied. Two series of linear epoxy-based polymers were synthesized by reaction between diglycidyl ether of bisphenol A (DGEBA), Disperse Orange-3 (DO3), and dodecylamine (DA). Two strategies of synthesis were employed…
Effect of calcium ions on structure and stability of the C1q-like domain of otolin-1 from human and zebrafish

Hołubowicz, Rafał; Wojtas, Magdalena; Taube, Michał; Kozak, Maciej; Ożyhar, Andrzej; Dobryszycki, Piotr

Customer publications

Effect of calcium ions on structure and stability of the C1q-like domain of otolin-1 from human and zebrafish

Hołubowicz, Rafał; Wojtas, Magdalena; Taube, Michał; Kozak, Maciej; Ożyhar, Andrzej; Dobryszycki, Piotr

Otolin-1 is a collagen-like protein expressed in the inner ear of vertebrates. It provides an organic scaffold for otoliths in fish and otoconia in land vertebrates. In this study, the expression and purification procedure of C1q-like domain of otolin-1 from human and zebrafish was developed. The structure and stability of…
Effect of aging and alkali activator on the porous structure of a geopolymer

Steins, P.; Poulesquen, A.; Frizon, F.; Diat, O.; Jestin, J.; Causse, J.; Lambertin, D.; Rossignol, S.

Customer publications

Effect of aging and alkali activator on the porous structure of a geopolymer

Steins, P.; Poulesquen, A.; Frizon, F.; Diat, O.; Jestin, J.; Causse, J.; Lambertin, D.; Rossignol, S.

Nitrogen sorption and small- and wide-angle X-ray and neutron scattering techniques were used to study the porous structure of geopolymers, inorganic polymers synthesized by reaction of a strongly alkaline solution and an aluminosilicate source (metakaolin). The effects of aging and the use of alkali activators (Na+, K+) of different sizes…
Effect of ammonium and aminosilane montmorillonites organo-clays on the curing kinetics of unsaturated polyester (UP) resin nanocomposites

Vargas, M. A.; Montiel, R.; Vázquez, H.

Customer publications

Effect of ammonium and aminosilane montmorillonites organo-clays on the curing kinetics of unsaturated polyester (UP) resin nanocomposites

Vargas, M. A.; Montiel, R.; Vázquez, H.

The curing kinetics of UP nanocomposites prepared by incorporating different amounts of two kinds of organo-montmorillonite (organo-MMT): trimethyloctadecacylammonium chloride (TMOA) and aminopropyl-triethoxysilane (APTES) were studied by non-isothermal differential scanning calorimetry (DSC) experiments. small angle X-ray scattering (SAXS) was used for measuring the d-spacings in the modified…