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Composite Hydrogels with Tunable Anisotropic Morphologies and Mechanical Properties

Chau, Mokit; De France, Kevin J.; Kopera, Bernd; Machado, Vanessa R.; Rosenfeldt, Sabine; Reyes, Laura; Chan, Katelyn J. W.; Förster, Stephan; Cranston, Emily D.; Hoare, Todd; Kumacheva, Eugenia

Customer publications

Composite Hydrogels with Tunable Anisotropic Morphologies and Mechanical Properties

Chau, Mokit; De France, Kevin J.; Kopera, Bernd; Machado, Vanessa R.; Rosenfeldt, Sabine; Reyes, Laura; Chan, Katelyn J. W.; Förster, Stephan; Cranston, Emily D.; Hoare, Todd; Kumacheva, Eugenia

Fabrication of anisotropic hydrogels exhibiting direction-dependent structure and properties has attracted great interest in biomimicking, tissue engineering, and bioseparation. Herein, we report a freeze-casting-based fabrication of structurally and mechanically anisotropic aerogels and hydrogels composed of hydrazone cross-linked poly(oligoethylene glycol methacrylate) (POEGMA) and cellulose…
Amphiphilic single and double networks: a small-angle X-ray scattering investigation

Zhang, Xiaohan; Kyriakos, Konstantinos; Rikkou-Kalourkoti, Maria; Kitiri, Elina N.; Patrickios, Costas S.; Papadakis, Christine M.

Customer publications

Amphiphilic single and double networks: a small-angle X-ray scattering investigation

Zhang, Xiaohan; Kyriakos, Konstantinos; Rikkou-Kalourkoti, Maria; Kitiri, Elina N.; Patrickios, Costas S.; Papadakis, Christine M.

We investigated the microphase-separated morphologies of water-swollen amphiphilic single and double polymer networks using small-angle X-ray scattering (SAXS). The networks consist of (i) a first conetwork containing hydrophobic blocks from either 2-ethylhexyl methacrylate (EHMA) or lauryl methacylate (LauMA) and hydrophilic blocks from 2-(dimethylamino)ethyl methacrylate (DMAEMA) and (ii) a…
Complexes of PEO-PPO-PEO triblock copolymer P123 and bile salt sodium glycodeoxycholate in aqueous solution: A small angle X-ray and neutron scattering investigation

Bayati, Solmaz; Galantini, Luciano; Knudsen, Kenneth D.; Schillén, Karin

Customer publications

Complexes of PEO-PPO-PEO triblock copolymer P123 and bile salt sodium glycodeoxycholate in aqueous solution: A small angle X-ray and neutron scattering investigation

Bayati, Solmaz; Galantini, Luciano; Knudsen, Kenneth D.; Schillén, Karin

Small angle X-ray (SAXS) and neutron scattering techniques were combined to study mixed complexes formed between micelles of the nonionic amphiphilic PEO-PPO-PEO copolymer (P123) and the anionic bile salt (NaGDC) in aqueous solution. The purpose was to investigate the structural parameters of the charged complexes, such as size and internal…
Small-Angle X-ray Scattering Demonstrates Similar Nanostructure in Cortical Bone from Young Adult Animals of Different Species

Kaspersen, Jørn Døvling; Turunen, Mikael Juhani; Mathavan, Neashan; Lages, Sebastian; Pedersen, Jan Skov; Olsson, Ulf; Isaksson, Hanna

Customer publications

Small-Angle X-ray Scattering Demonstrates Similar Nanostructure in Cortical Bone from Young Adult Animals of Different Species

Kaspersen, Jørn Døvling; Turunen, Mikael Juhani; Mathavan, Neashan; Lages, Sebastian; Pedersen, Jan Skov; Olsson, Ulf; Isaksson, Hanna

Despite the vast amount of studies focusing on bone nanostructure that have been performed for several decades, doubts regarding the detailed structure of the constituting hydroxyapatite crystal still exist. Different experimental techniques report somewhat different sizes and locations, possibly due to different requirements for the sample preparation. In this study,…
Adsorption of sodium dodecylsulfate on single-walled carbon nanotubes characterised using small-angle neutron scattering

Kastrisianaki-Guyton, E. S.; Chen, L.; Rogers, S. E.; Cosgrove, T.; van Duijneveldt, J. S.

Customer publications

Adsorption of sodium dodecylsulfate on single-walled carbon nanotubes characterised using small-angle neutron scattering

Kastrisianaki-Guyton, E. S.; Chen, L.; Rogers, S. E.; Cosgrove, T.; van Duijneveldt, J. S.

Aqueous dispersions of single-walled carbon nanotubes are often made using sodium dodecylsulfate (SDS), which adsorbs to the nanotube surface to stabilise them. Despite SDS being commonly used with single-walled carbon nanotubes, there is no consensus on the structure of the adsorbed layer. Small-angle neutron and X-ray scattering results reported here…
On the dissolution state of cellulose in aqueous tetrabutylammonium hydroxide solutions

Behrens, M. A.; Holdaway, J. A.; Nosrati, P.; Olsson, U.

Customer publications

On the dissolution state of cellulose in aqueous tetrabutylammonium hydroxide solutions

Behrens, M. A.; Holdaway, J. A.; Nosrati, P.; Olsson, U.

We have characterized the dissolution state of microcrystalline cellulose (MCC) in aqueous 40 wt% tetrabutylammonium hydroxide (TBAH) using a combination of light and small angle X-ray scattering, up to 0.1 g cm−3. In dilute solutions, cellulose–cellulose interactions are repulsive, as seen by a positive second virial coefficient. Above 0.04 g…
Monodisperse Cylindrical Micelles of Controlled Length with a Liquid-Crystalline Perfluorinated Core by 1D “Self-Seeding”

Li, Xiaoyu; Jin, Bixin; Gao, Yang; Hayward, Dominic W.; Winnik, Mitchell A.; Luo, Yunjun; Manners, Ian

Customer publications

Monodisperse Cylindrical Micelles of Controlled Length with a Liquid-Crystalline Perfluorinated Core by 1D “Self-Seeding”

Li, Xiaoyu; Jin, Bixin; Gao, Yang; Hayward, Dominic W.; Winnik, Mitchell A.; Luo, Yunjun; Manners, Ian

Precise control over the morphology and dimensions of block copolymer (BCP) micelles has attracted interest due to the potential of this approach to generate functional nanostructures. Incorporation of liquid crystalline (LC) block can provide additional ways to vary micellar morphologies, but the formation of uniform micelles with controllable dimensions from…
Sequence distribution and elastic properties of propylene-based elastomers

Tsou, Andy H.; Norman, Alexander I.; Lu, Yonglai; Throckmorton, Joseph A.; Hsiao, Benjamin S.

Customer publications

Sequence distribution and elastic properties of propylene-based elastomers

Tsou, Andy H.; Norman, Alexander I.; Lu, Yonglai; Throckmorton, Joseph A.; Hsiao, Benjamin S.

Three iso-specific organometallic catalysts for ethylene and propylene copolymerization with varying r1r2 parameters, i.e., the products of ethylene and propylene reactivity ratios, were utilized to synthesize equal-molecular-weight propylene-based elastomers (PBEs) of alternating, random, and blocky backbone sequences. To compensate for the variations in catalyst iso-specificity and thus to…
Ferroelectric switching and electrochemistry of pyrrole substituted trialkylbenzene-1,3,5-tricarboxamides

Meng, Xiao; Gorbunov, Andrey V.; Christian Roelofs, W. S.; Meskers, Stefan C. J.; Janssen, René A. J.; Kemerink, Martijn; Sijbesma, Rint P.

Customer publications

Ferroelectric switching and electrochemistry of pyrrole substituted trialkylbenzene-1,3,5-tricarboxamides

Meng, Xiao; Gorbunov, Andrey V.; Christian Roelofs, W. S.; Meskers, Stefan C. J.; Janssen, René A. J.; Kemerink, Martijn; Sijbesma, Rint P.

We explore a new approach to organic ferroelectric diodes using a benzene-tricarboxamide (BTA) core connected with C10 alkyl chains to pyrrole groups, which can be polymerized to provide a semiconducting ferroelectric material. The compound possesses a columnar hexagonal liquid crystalline (LC) phase and exhibits ferroelectric switching. At low switching frequencies,…
Morphology and tensile properties of model thermoplastic polyurethanes with MDI/butanediol based monodisperse hard segments

Ren, Li; Shah, Priyank N.; Faust, Rudolf

Customer publications

Morphology and tensile properties of model thermoplastic polyurethanes with MDI/butanediol based monodisperse hard segments

Ren, Li; Shah, Priyank N.; Faust, Rudolf

Morphology and tensile properties of model thermoplastic polyurethanes (TPUs) containing polyisobutylene (PIB) or poly(tetramethylene oxide) (PTMO) based soft segment and 4,4-methylene bis(phenyl isocyanate) (MDI) and 1,4-butanediol (BDO) based monodisperse hard segments (HSs), consisting of exactly two to four MDI units extended by BDO, were investigated. Using FT-IR spectroscopy, increased…