The yellow mini-hutch for SAXS experiments at MAX IV Laboratory

Labrador, Ana; Cerenius, Yngve; Svensson, C.; Theodor, Keld; Plivelic, Tomás S.

doi:10.1088/1742-6596/425/7/072019

Cited by 101 publications

(122 citation statements)

References 1 publication

Supporting

Mentioning

122

Contrasting

Order By: Relevance

“…Small angle X-ray scattering (SAXS) experiments were carried out at the I911-4 beamline (Labrador et al 2013) at the MAX-IV laboratory synchrotron using a wavelength of 0.91 Å . The samples were analyzed in a capillary maintained at 20°C, and were prepared 24 h prior to the measurements.…”

Section: Small Angle X Ray Scatteringmentioning

confidence: 99%

Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

et al. 2016

Self Cite

View full text Add to dashboard Cite

Natural anisotropic building-blocks such as cellulose nanocrystals (CNCs) have attracted considerable attention due to their biodegradability and nanometer-size. In this work the colloidal behavior of CNCs, obtained from sulfuric acid hydrolysis of microcrystalline cellulose, has been studied in presence of salts of different valences. The influence on the colloidal stability and nature of aggregates has been investigated for monovalent salts (LiCl, NaCl, KCl, CsCl), divalent salts (CaCl 2 and MgCl 2 ), and a trivalent salt (AlCl 3 ), both experimentally by means of turbidity and small angle X-ray scattering (SAXS) measurements, as well as by Monte Carlo simulations using a simple coarse-grained model. For the entire salt series, a critical aggregation concentration (CAC) could be determined by turbidity measurements, as a result of the reduction of effective Coulomb repulsions due to the presence of sulfate groups on the CNC surface. The CACs also followed the Schulze-Hardy law, i.e. the critical aggregation concentration decreased with increasing counterion valence. For the monovalent ions, the CACs followed the trend, which could be rationalized in terms of matching affinities between the cation and the sulfate groups present at the surface of CNCs. From the SAXS measurements it was shown that the density of the aggregates increased with increasing salt concentration and ion valence. In addition, these findings were rationalized by means of simulation, which showed a good correlation with experimental data. The combination of the experimental techniques and the simulations offered insight into interactionaggregation relationship of CNC suspensions, which is of importance for their structural design applications.Electronic supplementary material The online version of this article

show abstract

Section: Small Angle X Ray Scatteringmentioning

confidence: 99%

Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…SAXS measurements were performed at the MAX II SAXS beamline I911-4 at MAX IV Laboratory in Lund, Sweden (Labrador et al 2013). The scattered intensity (wavelength = 0.91 Å ), was recorded in the scattering Cellulose (2017) 24:3645-3657 3647 vector range 0.1-5.5 nm -1…”

Section: Saxsmentioning

confidence: 99%

On the dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide: a frustrated solvent

Idström¹,

Gentile

Gubitosi

et al. 2017

Cellulose

View full text Add to dashboard Cite

We have found that the dissolution of cellulose in the binary mixed solvent tetrabutylammonium acetate/dimethyl sulfoxide follows a previously overlooked near-stoichiometric relationship such that one dissolved acetate ion is able to dissolve an amount of cellulose corresponding to about one glucose residue. The structure and dynamics of the resulting cellulose solutions were investigated using small-angle X-ray scattering (SAXS) and nuclear magnetic resonance techniques as well as molecular dynamics simulation. This yielded a detailed picture of the dissolution mechanism in which acetate ions form hydrogen bonds to cellulose and causes a diffuse solvation sheath of bulky tetrabutylammonium counterions to form. In turn, this leads to a steric repulsion that helps to keep the cellulose chains apart. Structural similarities to previously investigated cellulose solutions in aqueous tetrabutylammonium hydroxide were revealed by SAXS measurement. To what extent this corresponds to similarities in dissolution mechanism is discussed.

show abstract

“…The SAXS experiments were carried out at the MAX-IV Synchrotron Laboratory, Lund, Sweden, using the beamline I911-4 with a wavelength of λ = 0.91 Å. 24 The scattering vector range q (q = 4π/λ sin(θ), where 2θ is the scattering angle) was 0.0082-0.47 Å -1 . A bi-dimensional hybrid pixel Xray detector (Pilatus 1M, Dectris) was used to obtain two-dimensional images with sample to detector distance of 1901.71 mm and an exposure time of either 2 or 5 min.…”

Section: Small Angle X-ray Scatteringmentioning

confidence: 99%

“…The SAXS data were analyzed using the software bli9114. 24 The obtained data were normalized with respect to integrated intensity incident on the sample during the exposure time and corrected for sample absorption and background.…”

Section: Small Angle X-ray Scatteringmentioning

confidence: 99%

Nanostructural Morphology of Plasticized Wheat Gluten and Modified Potato Starch Composites: Relationship to Mechanical and Barrier Properties

et al. 2015

View full text Add to dashboard Cite

In the present study, we were able to produce composites of wheat gluten (WG) protein and a novel genetically modified potato starch (MPS) with attractive mechanical and gas barrier properties using extrusion. Characterization of the MPS revealed an altered chain length distribution of the amylopectin fraction and slightly increased amylose content compared to wild type potato starch. WG and MPS of different ratios plasticized with either glycerol or glycerol and water were extruded at 110 and 130°C. The nano morphology of the composites showed the MPS having semi-crystalline structure of a characteristic lamellar arrangement with an approximately 100 Å period observed by SAXS and a B-type crystal structure observed by WAXS. WG has a structure resembling the hexagonal macromolecular arrangement as reported previously in WG films. A larger amount of β-sheets was observed in the samples 70/30 and 30/70 WG-MPS processed at 130°C with 45% glycerol. Highly polymerized WG protein was found in the samples processed at 130°C vs. 110°C. Also, greater amounts of WG protein in the blend resulted in greater extensibility (110°C), and a decrease in both E-modulus and maximum stress at 110 and 130°C, respectively. Under ambient conditions the WG-MPS composite (70/30) with 45% glycerol showed excellent gas barrier properties to be further explored in multilayer film packaging applications.

show abstract

The yellow mini-hutch for SAXS experiments at MAX IV Laboratory

Cited by 101 publications

References 1 publication

Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

Aggregation behavior of aqueous cellulose nanocrystals: the effect of inorganic salts

On the dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide: a frustrated solvent

Nanostructural Morphology of Plasticized Wheat Gluten and Modified Potato Starch Composites: Relationship to Mechanical and Barrier Properties

Contact Info

Product

Resources

About