Lu, Ying; Wang, Yaotao; Fu, Lianlian; Jiang, Zhiyong; Men, Yongfeng
Crystallization, Recrystallization, and Melting Lines in Syndiotactic Polypropylene Crystallized from Quiescent Melt and Semicrystalline State Due to Stress-Induced Localized Melting and Recrystallization
Crystalline lamellar thickness in syndiotactic polypropylene (sPP) during crystallization from either isothermal molten or stretching induced localized melt states and during subsequent heating was investigated by means of temperature dependent small-angle X-ray scattering techniques. Well-defined crystallization lines where the reciprocal lamellar thickness is linearly dependent on…
Cysteamine-modified ZIF-8 colloidal building blocks: Direct assembly of nanoparticulate MOF films on gold surfaces via thiol chemistry
Segovia, Gustavo M.; Tuninetti, Jimena S.; Moya, Sergio; Picco, Agustín S.; Ceolín, Marcelo R.; Azzaroni, Omar; Rafti, Matías
Chemical modification of metal organic framework (MOF) nanocrystal colloids was used to endow them with chemical affinity for gold substrates. Modified nanocrystals were then used as building blocks for rapid and selective self-assembly of porous films. Cysteamine (Cys, 2-aminoetanethiol) was chosen as both chemical modulator and functionalizing agent of Zeolite…
Determination of the Structures of Uranyl–Tri-n-butyl-Phosphate Aggregates by Coupling Experimental Results with Molecular Dynamic Simulations
Guilbaud, Phillipe; Berthon, Laurence; Louisfrema, Wilfried; Diat, Olivier; Zorz, Nicole
The complex structure of a plutonium uranium refining by extraction (PUREX) process organic phase was characterized by combining results from experiments and molecular dynamics simulations. For the first time, the molecular interactions between tri-n-butyl phosphate (TBP) and the extracted solutes, as well as TBP aggregation after the extraction of water…
Determining the Effective Density and Stabilizer Layer Thickness of Sterically Stabilized Nanoparticles
Akpinar, Bernice; Fielding, Lee A.; Cunningham, Victoria J.; Ning, Yin; Mykhaylyk, Oleksandr O.; Fowler, Patrick W.; Armes, Steven P.
A series of model sterically stabilized diblock copolymer nanoparticles has been designed to aid the development of analytical protocols in order to determine two key parameters: the effective particle density and the steric stabilizer layer thickness. The former parameter is essential for high resolution particle size analysis based on analytical…
Direct Formation of Different Crystalline Forms in Butene-1/Ethylene Copolymer via Manipulating Melt Temperature
Wang, Yaotao; Lu, Ying; Zhao, Jiayi; Jiang, Zhiyong; Men, Yongfeng
The crystallization behavior of a butene-1/ethylene random copolymer with 9.88 mol % ethylene counits was investigated by means of differential scanning calorimetry, wide- and small-angle X-ray scattering, and polarized optical microscopy. Unlike in its homopolymer counterpart which crystallizes always into a metastable form II from the melt state, the random…
Direct Nanoimprinting of a Colloidal Self-Organizing Nanowire Ink for Flexible, Transparent Electrodes
Maurer, Johannes H. M.; González‐García, Lola; Backes, Indra K.; Reiser, Beate; Schlossberg, Sarah M.; Kraus, Tobias
A semicontinuous process is used to nanoimprint a nanowire ink and form transparent conductive electrodes. Ultrathin gold nanowires are confined in the features of an elastomeric stamp, where they spontaneously assemble upon drying into hierarchical, percolating superstructures. This templated self-organization yields grids with defined line widths down to 0.9 µm…
Direct synthesis of ordered mesoporous hydrothermal carbon materials via a modified soft-templating method
Xiao, Pei-Wen; Zhao, Li; Sui, Zhu-Yin; Xu, Meng-Ying; Han, Bao-Hang
We developed a facile and universal method for synthesizing ordered mesoporous hydrothermal carbon materials from saccharides through a modified soft-templating approach. In a typical process, the micelles formed during the dissolving process of triblock copolymer and acted as soft template. Then, in order to avoid the destruction of the micelles…
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…
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 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…