Choupin, T.; Fayolle, B.; Régnier, G.; Paris, C.; Cinquin, J.; Brulé, B.
Isothermal crystallization kinetic modeling of poly(etherketoneketone) (PEKK) copolymer
Isothermal melt and cold crystallizations of a poly(etherketoneketone) (PEKK) copolymer prepared from diphenyl ether (DPE), terephthalic acid (T) and isophthalic acid (I) with a T/I ratio of 60/40 have been investigated by differential scanning calorimetry, wide-angle X-ray scattering and polarized optical microscopy. For the first time, the two-stage overall crystallization…
Investigating solvent effects on aggregation behaviour, linear and nonlinear optical properties of silver nanoclusters
Bhavitha, K. B.; Nair, Anju K.; Perumbilavil, Sreekanth; Joseph, Saju; Kala, M. S.; Saha, Abhijit; Narayanan, R. Aravinda; Hameed, Nishar; Thomas, Sabu; Oluwafemi, Oluwatobi S.; Kalarikkal, Nandakumar
We herein report the solvent effects on the aggregation, linear and nonlinear optical properties of silver nanoclusters synthesised using three solvents namely; ethanol, acetone and isopropanol. The Ag clusters were characterized using UV–Visible (UV–vis) and photoluminescence (PL) spectroscopy, Fourier transform-infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), high…
Integration of lysozyme into chitosan nanoparticles for improving antibacterial activity
Wu, Tiantian; Wu, Chunhua; Fu, Shalu; Wang, Liping; Yuan, Chunhong; Chen, Shiguo; Hu, Yaqin
Lysozyme was integrated into chitosan nanoparticles (CS-NPs) to improve the antibacterial activity. CS-NPs and chitosan-lysozyme nanoparticles (CS-Lys-NPs) were prepared according to the ionic gelation technique and then characterized by average size, zeta potential, polydispersity index (PDI), atomic force microscopy (AFM), fourier transform infrared (FT-IR), small-angle X-ray scattering (SAXS),…
Inter-fibrillar tie chains determined critical stress of large strain cavitation in tensile stretched isotactic polypropylene
Lu, Ying; Lyu, Dong; Xiong, Bijin; Chen, Ran; Men, Yongfeng
Isotactic polypropylene (iPP) samples with pure mesophase, pure α modification, and coexistence of both phases were used to investigate the sudden stress whitening triggered at large strain during stretching. This whitening was caused by the cavities generated in the highly oriented amorphous network. The critical stresses of such cavitation-induced whitening…
Insights into gliadin supramolecular organization at digestive pH 3.0
Herrera, M. G.; Vazquez, D. S.; Sreij, R.; Drechsler, M.; Hertle, Y.; Hellweg, T.; Dodero, V. I.
Alpha-gliadin is a highly immunogenic protein from wheat, which is associated with many human diseases, like celiac disease and non-celiac gluten sensitivity. Because of that, gliadin solution is subject to intense biomedical research. However, the physicochemical nature of the employed gliadin solution at physiological pH is not understood. Herein, we…
Initiation of cavitation upon drawing of pre-oriented polypropylene film: In situ SAXS and WAXD studies
Xiong, Bijin; Kang, Jian; Chen, Ran; Men, Yongfeng
Initiation of cavitation upon drawing of pre-oriented polypropylene films has been investigated via in-situ small angle X-ray scattering (SAXS) and wide angle X-ray diffraction (WAXD) techniques. The macroscopic strains for the initiation of the cavitation εcav and for the initiation of crystal shear εcs have been estimated from in-situ SAXS…
Influence of propylene-based elastomer on stress-whitening for impact copolymer
Lu, Ying; Sun, Yingying; Li, Lan; Men, Yongfeng
Two pure impact copolymer polypropylenes (ICP), one pure homo-polypropylene (HPP) and their compounds with different type and fraction of Vistamaxx™ propylene-based elastomer (“Vistamaxx”) were used to investigate the stress whitening activated in the impact processes via ultra-small-angle X-ray scattering technique. The whitening presented in ICP is confirmed to be caused…
Improving the fracture toughness of epoxy with nanosilica-rubber core-shell nanoparticles
Liu, Songlin; Fan, Xiaoshan; He, Chaobin
Nanocomposites from epoxy and nanosilica-rubber core–shell nanoparticles were fabricated. The soft shell was a copolymer synthesized from caprolactone and meso-lactide and was designed compatible with the cured epoxy system. The core–shell nanoparticles achieved a reasonably good dispersion in the matrix with minor aggregations. With the addition of the nanosilica based…
Impact of aluminum on the structure of geopolymers from the early stages to consolidated material
Benavent, Virginie; Steins, Prune; Sobrados, Isabel; Sanz, Jesus; Lambertin, David; Frizon, Fabien; Rossignol, Sylvie; Poulesquen, Arnaud
The aim of this study is to assess the effects of the addition of aluminum (NaAlO2) into the activating solution on the geopolymerization reactions and the characteristics of the porous network. It was established by liquid state NMR that the speciation of the aluminosilicate oligomers and then the mean degree…
Hydrazinium-loaded perovskite solar cells with enhanced performance and stability
Akbulatov, Azat F.; Frolova, Lyubov A.; Anokhin, Denis V.; Gerasimov, Kirill L.; Dremova, Nadezhda N.; Troshin, Pavel A.
In this study, we investigated the effects of partial substitution of methylammonium (MA) with hydrazinium (HA) cations on the optical properties, film morphology, crystal structure and photovoltaic performance of the hybrid perovskites MA1−xHAxPbI3. Planar heterojunction solar cells with an optimal hydrazinium loading demonstrated an enhanced power conversion efficiency of 11.6%…