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Xenocs

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…
12 March 2019
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsFractal dimensionMaterialPolymer researchSAXSTechniqueWAXS

Anomalies in the low frequency vibrational density of states for a polymer with intrinsic microporosity – the Boson peak of PIM-1

Zorn, Reiner; Yin, Huajie; Lohstroh, Wiebke; Harrison, Wayne; Budd, Peter M.; Pauw, Brian R.; Böhning, Martin; Schönhals, Andreas

Polymers with intrinsic microporosity are promising candidates for the active separation layer in gas separation membranes. Here, the vibrational density of states (VDOS) for PIM-1, the prototypical polymer with intrinsic microporosity, is investigated by means of inelastic neutron scattering. The results are compared to data measured for a more conventional…
12 March 2019
Customer publications

Are Keggin’s POMs Charged Nanocolloids or Multicharged Anions?

Malinenko, Alla; Jonchère, Alban; Girard, Luc; Parrès-Maynadié, Sandra; Diat, Olivier; Bauduin, Pierre

Owing to their multiple charges and their nanometric size, polyoxometalates (POMs) are at the frontier between ions and charged colloids. We investigated here the effect of POM–POM electrostatics repulsions on their self-diffusion in water by varying POM and supporting salt concentrations. The self-diffusion coefficients of two Keggin’s POMs [silicotungstate (SiW12O404–)…
12 March 2019
Customer publications

Assembly and photochemical properties of mesoporous networks of spinel ferrite nanoparticles for environmental photocatalytic remediation

Skliri, Euaggelia; Miao, Jianwei; Xie, Jian; Liu, Guangfeng; Salim, Teddy; Liu, Bin; Zhang, Qichun; Armatas, Gerasimos S.

Spinel ferrite materials have an electronic band structure that is well suited for visible light-induced catalysis, however, their photocatalytic activity remains low due to the daunting charge-carrier separation process. In this article, we report that high-surface-area mesoscopic architectures composed of tightly connected ultrasmall spinel ferrite nanocrystals can efficiently suppress…
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…
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…
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 (
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…
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…
12 March 2019