Henning, Laura M.; Cubas, Diego Díaz; Colmenares, Maria G.; Schmidt, Johannes; Bekheet, Maged F.; Pauw, Brian R.; Gurlo, Aleksander; Simon, Ulla
High specific surface area ordered mesoporous silica COK-12 with tailored pore size
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…
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.…
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…
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…
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…
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…
Oxidation reactions in kink banded regions of UHMMPE fiber-based laminates used in body armor: A mechanistic study
Tsinas, Zois; Forster, Amanda L.; Al-Sheikhly, Mohamad
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…
A small-angle x-ray scattering system with a vertical layout
Wang, Zhen; Chen, Xiaowei; Meng, Lingpu; Cui, Kunpeng; Wu, Lihui; Li, Liangbin
Review of Scientific Instruments, 2014, vol 85, 12, pp. 125110DOI:10.1063/1.4903760Visit the full articleBack to the overview
Achieving grazing-incidence ultra-small-angle X-ray scattering in a laboratory setup
Zheng, N.; Yi, Z.; Li, Z.; Chen, R.; Lai, Y.; Men, Y.
A grazing-incidence sample stage was designed for realizing grazing-incidence scattering measurements, especially in the ultra-small-angle regime, in a modified Xenocs Xeuss system in the laboratory. The designed sample stage, which is composed of four separate motorized positioning stages, allows the sample to be moved along four different directions to locate…
Adsorption of F127 onto Single-Walled Carbon Nanotubes Characterized Using Small-Angle Neutron Scattering
Kastrisianaki-Guyton, E. S.; Chen, L.; Rogers, S. E.; Cosgrove, T.; van Duijneveldt, J. S.
Aqueous single-walled carbon nanotube dispersions are often made using polymers from the pluronic family of amphiphilic block copolymers; however, relatively few studies have been conducted using small-angle neutron scattering techniques to discover the mechanism by which they act. SANS results reported here show that a relatively simple core?shell cylinder model…