Monthly Archives

March 2019

Customer publications

DMPC vesicle structure and dynamics in the presence of low amounts of the saponin aescin

Sreij, Ramsia; Dargel, Carina; Geisler, Philippe; Hertle, Yvonne; Radulescu, Aurel; Pasini, Stefano; Perez, Javier; Moleiro, Lara H.; Hellweg, Thomas

Vesicle shape and bilayer parameters are studied by small-angle X-ray (SAXS) and small-angle neutron (SANS) scattering in the presence of the saponin aescin. We confirm successful incorporation of aescin molecules by analysis of the radii of gyration RG and study furthermore the impact of aescin incorporation on bilayer thickness parameters…
Xenocs
12 March 2019
Characteristic dimensionCustomer publicationsFibersOtherSAXSWAXS

Determination of the packing model of a supramolecular nanofiber via mass-per-length measurement and de novo simulation

Yao, Qingxin; Bao, Qiang; Li, Xinming; Wang, Hui; Yang, Zhenyu; Shi, Xinghua; Gao, Yuan; Xu, Bing

Herein, we report an example of using scanning transmission electron microscopy to determine the mass-per-length of supramolecular nanofibers. Together with the measurement of the diameter of nanofibers via transmission electron microscopy, we could estimate the packing density of assembling molecules along the nanofibers. A parallel unbiased de novo simulation screens…
Xenocs
12 March 2019
Customer publications

Covalently bonded multimers of Au25(SBut)18 as a conjugated system

Sels, Annelies; Salassa, Giovanni; Cousin, Fabrice; Lee, Lay-Theng; Bürgi, Thomas

Aromatic dithiol linkers were used to prepare aggregates of Au25(SR)18 clusters (SR: thiolate) via ligand exchange reactions. Fractions of different aggregate sizes were separated by size exclusion chromatography (SEC). The aggregates were characterized by UV-vis absorption spectroscopy, matrix assisted laser desorption ionization (MALDI) mass spectrometry, nuclear magnetic resonance (NMR)…
Xenocs
12 March 2019
Customer publications

Creating cross-linked lamellar block copolymer supporting layers for biomimetic membranes

Lang, Chao; Shen, Yue-xiao; LaNasa, Jacob A.; Ye, Dan; Song, Woochul; Zimudzi, Tawanda J.; Hickner, Michael A.; Gomez, Enrique D.; Gomez, Esther W.; Kumar, Manish; Hickey, Robert J.

The long-standing goal in membrane development is creating materials with superior transport properties, including both high flux and high selectivity. These properties are common in biological membranes, and thus mimicking nature is a promising strategy towards improved membrane design. In previous studies, we have shown that artificial water channels can…
Xenocs
12 March 2019
Customer publications

Compatibilization of multicomponent composites through a transitioning phase: Interfacial tensions considerations

Koh, J. Justin; Zhang, Xiwen; Kong, Junhua; He, Chaobin

A novel interfacial compatibilization technique for incompatible polymer blends or composites is proposed, in which a transitioning layer was introduced between the matrix and the dispersed phase of the otherwise incompatible components. The transitioning phase should have good interactions with both the components, resulting in lower interfacial energy between the…
Xenocs
12 March 2019
Customer publications

Chirality inversion, supramolecular hydrogelation and lectin binding of two thiolactose amphiphiles constructed on a di-lauroyl-L-tartaric acid scaffold

Cano, María Emilia; Chenna, Pablo Héctor Di; Lesur, David; Wolosiuk, Alejandro; Kovensky, José; Uhrig, María Laura

Herein we report the synthesis, characterization and self-assembly properties of two new thiolactose based amphiphiles constructed on a di-lauroyl-L-tartaric acid scaffold that only differ in the length of the spacer by an ethylene glycol unit. Upon dissolution in hot water the amphiphiles give rise to different colloidal systems at 25…
Xenocs
12 March 2019
Customer publications

Characterization of ketoprofen-loaded PEG-CH semi-IPN system for wound dressing application

Gaitán‐Tolosa, Ibeth M.; Montiel‐Campos, Raúl; Flores‐Estrada, Jaime; Domínguez‐García, Ma Victoria; Flores‐Merino, Miriam V.

Polymer systems, in the form of crosslinking networks, have been widely used in biomedicine. However, they are a challenge mainly due to the impact of their physicochemical properties on release kinetics of drugs. Ketoprofen is an analgesic anti-inflammatory drug with short half-life (
Xenocs
12 March 2019
(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialOrientation analysisPolymer researchSAXSTechniqueTemperatureTensileUSAXS

Cavitation in Poly(4-methyl-1-pentene) during Tensile Deformation

Chen, Ran; Lu, Ying; Jiang, Zhiyong; Men, Yongfeng

The poly(4-methyl-1-pentene) sample was used to investigate the cavitation-induced stress-whitening phenomenon during stretching at different temperatures via the ultrasmall-angle X-ray scattering technique. Two modes of cavitation were found that mode I cavitation activated around yield point followed by mode II cavitation generated in highly oriented state. The critical strain for…
Xenocs
12 March 2019
Customer publications

Asynchronous fracture of hierarchical microstructures in hard domain of thermoplastic polyurethane elastomer: Effect of chain extender

Guo, Yaqian; Zhang, Ruoyu; Xiao, Qiang; Guo, Hongxia; Wang, Zongbao; Li, Xing; Chen, Jing; Zhu, Jin

Four chain extenders, 1,3-propanediol (PDO), 2-methyl-1,3-propanediol (MPO), 2,2-dimethyl-1,3-propanediol (NPG) and 2,2,4,4-tetramethyl-1,3-cyclobutanedio (CBDO) are chosen to synthesize model polyurethanes, respectively. Although with similar oxygen distance between the two hydroxyl groups, their volumes increase gradually according to computer simulation. As expected, the degree of microphase…
Xenocs
12 March 2019