Xiao, Pei-Wen; Zhao, Li; Sui, Zhu-Yin; Xu, Meng-Ying; Han, Bao-Hang
Direct synthesis of ordered mesoporous hydrothermal carbon materials via a modified soft-templating method
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…
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 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…
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…
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…
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…
Crystallization, Recrystallization, and Melting Lines in Syndiotactic Polypropylene Crystallized from Quiescent Melt and Semicrystalline State Due to Stress-Induced Localized Melting and Recrystallization
Lu, Ying; Wang, Yaotao; Fu, Lianlian; Jiang, Zhiyong; Men, Yongfeng
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…
Crystallization of Polymer Chains Chemically Attached on a Surface: Lamellar Orientation from Flat-on to Edge-on
Chen, Yihuang; Gan, Tiansheng; Ma, Chunfeng; Wang, Linge; Zhang, Guangzhao
Crystallization of polymer chains confined on a surface greatly influences surface properties. We have grafted comb-like copolymer, consisting of poly(2-hydroxyethyl methacrylate) (PHEMA) backbone and semicrystalline poly(ε-caprolactone) (PCL) side chains, on silicon surface and investigated the crystallization of such confined PCL chains upon solvent evaporation by using atomic force microscopy…
Crystallization of hard segments in MDI/BD-based polyurethanes deformed at elevated temperature and their dependence on the MDI/BD content
Li, Xuke; Lu, Ying; Wang, Hai; Pöselt, Elmar; Eling, Berend; Men, Yongfeng
Morphological variation of thermoplastic polyurethanes (TPUs) with different hard segment contents (HSCs) stretched at 100 °C higher than the Tg of hard domain was monitored by in-situ wide-angle X-ray scattering (WAXS) and small-angle X-ray scattering (SAXS) techniques. WAXS patterns reveal that the crystalline modification of TPUs with high HSCs transforms from…
Crystallization and melting of isotactic polypropylene crystallized from quiescent melt and stress-induced localized melt
Lu, Ying; Wang, Yaotao; Chen, Ran; Men, Yongfeng
Temperature dependency of crystalline lamellar thickness during crystallization and subsequent melting in isotactic polypropylene crystallized from both quiescent molten state and stress-induced localized melt was investigated using small angle X-ray scattering technique. Both cases yield well-defined crystallization lines where inverse lamellar thickness is linearly dependent on crystallization…