All Posts By

sergio.rodrigues@xenocs.com

ApplicationCharacterizationCustomer publicationsFibersFractal dimensionMaterialOrientation analysisOtherSAXSTechnique

4D biofabrication of skeletal muscle microtissues

Apsite, Indra; Uribe, Juan Manuel; Posada, Andrés Fernando; Rosenfeldt, Sabine; Salehi, Sahar; Ionov, Leonid

Skeletal muscle is one of the most abundant tissues in the body. Although it has a relatively good regeneration capacity, it cannot heal in the case of disease or severe damage. Many current tissue engineering strategies fall short due to the complex structure of skeletal muscle. Biofabrication techniques have emerged…
27 January 2020
(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialOrientation analysisPolymer researchTechniqueWAXS

Multi-scale modelling approach to homogenise the mechanical properties of polymeric closed-cell bead foams

Gebhart, Thomas M. J.; Jehnichen, Dieter; Koschichow, Roman; Müller, Michael; Göbel, Michael; Geske, Vinzenz; Stegelmann, Michael; Gude, Maik

The complex mechanical deformation behaviour of closed-cell foams is governed by morphological and physical properties such as cell structure and crystallinity. In this study, the micro-, meso- and macroscopic scale of commercially available bead foam was analysed. Statistical distribution of the cell structure including cell size, wall thickness and shape…
27 January 2020
ApplicationCharacterizationCrystalline fractionCustomer publicationsInorganic materialMaterialNanoparticles & colloidsParticlesSAXSShapeSizeTechniqueWAXS

Nucleation and Growth Kinetics of ZnO Nanoparticles Studied by in Situ Microfluidic SAXS/WAXS/UV–Vis Experiments

Herbst, Maria; Hofmann, Eddie; Förster, Stephan

The synthesis of ZnO nanoparticles proceeds through a complex sequence of precursor reactions, nucleation, and growth processes. For further advancement and control of nanoparticle synthesis, a detailed understanding of the mechanisms and kinetics is essential. With the recent advancement in X-ray scattering and spectroscopy methods, in situ experiments during nanoparticle…
27 January 2020
(Natural) polymersApplicationCharacterizationCustomer publicationsFractal dimensionMaterialNanoparticles & colloidsParticlesSAXSShapeSizeTechnique

Soft cellulose II nanospheres: sol–gel behaviour, swelling and material synthesis

Beaumont, Marco; Rosenfeldt, Sabine; Tardy, Blaise L.; Gusenbauer, Claudia; Khakalo, Alexey; Nonappa; Opietnik, Martina; Potthast, Antje; Rojas, Orlando J.; Rosenau, Thomas

High axial aspect crystalline nanomaterials have emerged as polymeric building blocks for the construction of supermaterials. In contrast to this form, amorphous nanospheres have remained largely untapped. This is especially peculiar in the context of material assembly, due to the wide range of opportunities they offer by virtue of their…
27 January 2020
(Natural) polymersApplicationCharacterizationCrystalline fractionCustomer publicationsMaterialPolymer researchTechniqueWAXS

Improving the Hydrolysis Rate of the Renewable Poly(hexamethylene sebacate) Through Copolymerization of a Bis(pyrrolidone)-Based Dicarboxylic Acid

Noordzij, Geert J.; Roy, Manta; Bos, Natasja; Reinartz, Vincent; Wilsens, Carolus H. R. M.

In this work, we report on the synthesis of a series of polyesters based on 1,6-hexanediol, sebacic acid, and N,N’-dimethylene-bis(pyrrolidone-4-carboxylic acid) (BP-C2), of which the latter is derived from renewable itaconic acid and 1,2-ethanediamine. Copolymers with a varying amount of BP-C2 as dicarboxylic acid are synthesized using a melt-polycondensation reaction…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialPolymer researchTechniqueWAXS

Pendant side-chain sterics against electrostatic forces: Influencing short-range ordering in random polyelectrolytes

Nwosu, Chinomso; Coughlin, E. Bryan

The length of pendant side chains in charged, random, comb-shaped polymers dictates the nature of their short-range ordering. Random copolymers, and terpolymer, of 4-vinylpyridine (4VP), styrene, and isoprene were synthesized and subsequently fully quaternized with 1-alkylbromides having varying number of carbons on the alkyl group ranging from 2 to 8.…
27 January 2020
ApplicationCharacterizationCustomer publicationsInorganic materialMaterialParticlesProteins & DNA/RNASAXSShapeSizeStructural biologyTechnique

Probing the Nanostructure and Arrangement of Bacterial Magnetosomes by Small-Angle X-Ray Scattering

Rosenfeldt, Sabine; Riese, Cornelius N.; Mickoleit, Frank; Schüler, Dirk; Schenk, Anna S.

Magnetosomes are membrane-enveloped single-domain ferromagnetic nanoparticles enabling the navigation of magnetotactic bacteria along magnetic field lines. Strict control over each step of biomineralization generates particles of high crystallinity, strong magnetization, and remarkable uniformity in size and shape, which is particularly interesting for many biomedical and biotechnological…
27 January 2020
ApplicationCharacterizationCustomer publicationsInorganic materialMaterialNanoparticles & colloidsParticle size and size distributionParticlesSAXSTechnique

Rapid synthesis of [Au25(Cys)18] nanoclusters via carbon monoxide in microfluidic liquid-liquid segmented flow system and their antimicrobial performance

Huang, He; Hwang, Gi Byoung; Wu, Gaowei; Karu, Kersti; Du Toit, Hendrik; Wu, Han; Callison, June; Parkin, Ivan P.; Gavriilidis, Asterios

Atomically precise thiolate-gold nanoclusters with well-defined structures attract attention for use in various applications. However, most of the recently reported synthetic methods rely on prolonged synthesis times (a few hours to days) in order to produce high purity materials with a single cluster size. Such extended synthesis times make these…
27 January 2020
(Natural) polymersApplicationCharacterizationCustomer publicationsMaterialOtherOtherSAXSTechniqueWAXS

Bacteria-Resistant, Transparent, Free-Standing Films Prepared from Complex Coacervates

Kurtz, Irene S.; Sui, Shuo; Hao, Xi; Huang, Mengfei; Perry, Sarah L.; Schiffman, Jessica D.

We report the fabrication, properties, and bacteria-resistance of polyelectrolyte complex (PEC) coatings and free-standing films. Poly(4-styrenesulfonic acid), poly(diallyldimethylammonium chloride), and salt were spin-coated into PEC films. After thermal annealing in a humid environment, highly transparent, mechanically strong, and chemically robust films were formed. Notably, we demonstrate…
27 January 2020
(Natural) polymersApplicationCharacteristic dimensionCharacterizationCustomer publicationsMaterialOtherPolymer researchSAXSSelf-assembled materialTechniqueTemperature

Two-Step Chemical Transformation of Polystyrene-block-poly(solketal acrylate) Copolymers for Increasing ?

Yu, Duk Man; Smith, Darren M.; Kim, Hyeyoung; Rzayev, Javid; Russell, Thomas P.

We investigated the two-step chemical transformation of a series of symmetric poly(styrene-b-solketal acrylate) (PS-b-PSA) copolymers with varying molecular weights from 1900 to 27?300 g/mol (13 ? N ? 194) synthesized by sequential atom transfer radical polymerization. Through acid-catalyzed hydrolysis, the PSA block is converted into poly(glycerol acrylate) (PGA), which subsequently…
27 January 2020