Tsinas, Zois; Forster, Amanda L.; Al-Sheikhly, Mohamad
Oxidation reactions in kink banded regions of UHMMPE fiber-based laminates used in body armor: A mechanistic study
This work demonstrates the synergy between the thermo-mechanical and humidity induced degradation as well as the oxidation reactions in the kink-banded areas of ultra-high molar mass polyethylene (UHMMPE) fiber-based laminates used in body armor. For aged materials, the energy-dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) results reveal…
Formation of a new type of uranium(IV) poly-oxo cluster {U38} based on a controlled release of water via esterification reaction
Martin, Nicolas P.; Volkringer, Christophe; Henry, Natacha; Trivelli, Xavier; Stoclet, Grégory; Ikeda-Ohno, Atsushi; Loiseau, Thierry
A new strategy for the synthesis of large poly-oxo clusters bearing 38 tetravalent uranium atoms {U38} has been developed by controlling the water release from the esterification reaction between a carboxylic acid and an alcohol. The molecular entity ·(ipa)x (ipa = isopropanol) was crystallized from the solvothermal reaction of a…
Effects of the biaxial orientation on the mechanical and optical properties and shrinkage of polyamide 6-66–montmorillonite–nanosilica nanocomposite films
Liu, Xiaochao; Liu, Yuejun; Yang, Jian; Wang, Wenzhi; Lai, Dengwang; Mao, Long; Zheng, Wei; Yang, Jun; Chen, Xi
Polyamide 6–66 (PA6-66)–montmorillonite (MMT)–nanosilica (NS) nanocomposite films were fabricated through a cast film process and then biaxially stretched on a laboratory stretcher. Uniaxial or biaxial stretching induced the elongated conformation of MMT and NS. The b axis of the α crystals and the amorphous phase were revealed to align along…
Temperature Dependent Self-Organization of DMPC Membranes Promoted by Intermediate Amounts of the Saponin Aescin
Sreij, Ramsia; Dargel, Carina; Hannappel, Yvonne; Jestin, Jacques; Prévost, Sylvain; Dattani, Rajeev; Wrede, Oliver; Hellweg, Thomas
The plant-derived biosurfactant aescin is naturally present in many plants and is used for treatment of disorders such as varicose veins and inflammation of veins. The hemolytic activity of this saponin is attributed to its interaction with cholesterol in the red blood cell membrane. This work investigates the phase and…
Large strain cavitation induced stress whitening in propylene-butene-1 copolymer during stretching
Lyu, Dong; Tang, Yujing; Qian, Li; Chen, Ran; Lu, Ying; Men, Yongfeng
Large strain cavitation induced stress whitening was observed in propylene-butene-1 copolymer during stretching by means of ultra-small angle X-ray scattering technique. The critical stress for initiating this cavitation depended on the stretching temperature (Ts). A constant critical stress was found below Ts of 125 °C while the stress started to increase…
Shear-Induced Transformation of Polymer-Rich Lamellar Phases to Micron-Sized Vesicles
Großkopf, Sören; Tiersch, Brigitte; Koetz, Joachim; Mix, Andreas; Hellweg, Thomas
In the present work, we study the shear-induced transformation of polymer-rich lamellar phases into vesicles. The evolution of vesicle size is studied by different scattering techniques, rheology, and microscopy methods. The lamellar phase found in the system D2O/o-xylene/Pluronic PE9400/C8TAB can be fully transformed to multilamellar vesicles (MLVs) by applying shear.…
High specific surface area ordered mesoporous silica COK-12 with tailored pore size
Henning, Laura M.; Cubas, Diego Díaz; Colmenares, Maria G.; Schmidt, Johannes; Bekheet, Maged F.; Pauw, Brian R.; Gurlo, Aleksander; Simon, Ulla
Ordered mesoporous silica materials such as COK-12, analogous to the well-known SBA-15, are characterized by high surface areas and unique features such as defined pore sizes in the meso-size range and high pore ordering. The aim of this work was to prove the washing step and choice of calcination and…
Poly(oxymethylene)/poly(butylene succinate) blends: Miscibility, crystallization behaviors and mechanical properties
Jiao, Qi; Shen, Jieqing; Ye, Lijun; Li, Yongjin; Chen, Hualin
In this work, we investigated the miscibility, crystallization behaviors and mechanical properties of the crystalline/crystalline poly(oxymethylene)/poly(butylene succinate) (POM/PBSU) blends. It was found that POM and PBSU are miscible in the melt state. The POM with a higher melting temperature (Tm) crystallizes first into banded spherulites and the crystals fill the…
Enhanced Oxidation Stability of Transparent Copper Films Using a Hybrid Organic-Inorganic Nucleation Layer
Bellchambers, Phillip; Walker, M.; Huband, Steven; Dirvanauskas, A.; Hatton, Ross Andrew
We report a novel seed layer for the formation of slab-like transparent copper films on glass and plastic substrates, based on a mixed molecular monolayer and an ultra-thin (0.8 nm) aluminium layer both deposited from the vapour phase, which substantially outperforms the best nucleation layer for optically thin copper films…
In-flight modification of Ni nanoparticles by tubular magnetron sputtering
Kretkova, Tereza; Hanuš, Jan; Kylian, Ondrej; Solař, Pavel; Dopita, Milan; Cieslar, Miroslav; Choukourov, Andrei; Biederman, Hynek
Abstract Tubular magnetron was used for in-flight deposition of Cu over Ni nanoparticles (NPs) pre-synthesized in a planar magnetron-based gas aggregation cluster source. The amount of deposited copper was driven by magnetron current and magnetic field of the tubular magnetron. Structure of the resultant NPs was investigated by TEM, STEM,…