Flexibility and Cross-Sectional Structure of an Anionic Dual-Surfactant Wormlike Micelle Explored with Small-Angle X-ray Scattering Coupled with Contrast Variation Technique

2009 ◽  
Vol 113 (30) ◽  
pp. 10222-10229 ◽  
Author(s):  
Kenzo Naruse ◽  
Kenichi Eguchi ◽  
Isamu Akiba ◽  
Kazuo Sakurai ◽  
Hiroyasu Masunaga ◽  
...  
Keyword(s):  
Small Angle ◽  
Contrast Variation ◽  
Cross Sectional ◽  
X Ray ◽  
X Ray Scattering ◽  
Wormlike Micelle ◽  
Sectional Structure ◽  
Variation Technique ◽  
Ray Scattering

Accessing the hidden lamellar nanostructure of semi-crystalline nascent polymers by small-angle X-ray scattering contrast variation

2011 ◽  
Vol 44 (5) ◽  
pp. 1123-1126 ◽  
Author(s):  
Harry Westfahl Jr ◽  
Mateus Borba Cardoso
Keyword(s):  
Small Angle ◽  
Contrast Variation ◽  
Interference Peak ◽  
X Ray ◽  
Crystalline Polymers ◽  
X Ray Scattering ◽  
Interface Scattering ◽  
Scattering Contribution ◽  
Variation Technique ◽  
Ray Scattering

Most melt-crystallized polymers present a lamellar nanostructure of alternating crystalline and amorphous lamellae which is coherent enough to display a broad interference peak in small-angle X-ray scattering experiments (SAXS). Nascent semi-crystalline polymers, on the other hand, though highly crystalline, hardly show an interference peak. This has long been attributed either to the formation of extended chain crystals or to a highly incoherent lamellar stacking. Here it is shown that a coherent lamellar order is shaded by a large scattering contribution from the air/grain interface. This is revealed by a SAXS contrast variation technique that suppresses the air/grain interface scattering and leaves only the scattering contribution from the internal lamellae.

Measurement of cross-sectional profile for sub-15nm hp LS patterns in nanoimprint templates using small-angle x-ray scattering

2020 ◽  
Author(s):  
Kazuki Hagihara ◽  
Eiji Yamanaka ◽  
Yoshiyasu Ito ◽  
Kiyoshi Ogata ◽  
Kazuhiko Omote ◽  
...  
Keyword(s):  
Small Angle ◽  
Cross Sectional ◽  
X Ray ◽  
X Ray Scattering ◽  
Cross Sectional Profile ◽  
Sectional Profile ◽  
Ray Scattering

scholarly journals Visualizing a viral genome with contrast variation small angle X-ray scattering

2020 ◽  
Vol 295 (47) ◽  
pp. 15923-15932
Author(s):  
Josue San Emeterio ◽  
Lois Pollack
Keyword(s):  
Small Angle ◽  
Viral Genome ◽  
Viral Assembly ◽  
Measured Signal ◽  
Structural Rearrangements ◽  
Contrast Variation ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Despite the threat to human health posed by some single-stranded RNA viruses, little is understood about their assembly. The goal of this work is to introduce a new tool for watching an RNA genome direct its own packaging and encapsidation by proteins. Contrast variation small-angle X-ray scattering (CV-SAXS) is a powerful tool with the potential to monitor the changing structure of a viral RNA through this assembly process. The proteins, though present, do not contribute to the measured signal. As a first step in assessing the feasibility of viral genome studies, the structure of encapsidated MS2 RNA was exclusively detected with CV-SAXS and compared with a structure derived from asymmetric cryo-EM reconstructions. Additional comparisons with free RNA highlight the significant structural rearrangements induced by capsid proteins and invite the application of time-resolved CV-SAXS to reveal interactions that result in efficient viral assembly.

scholarly journals Size Determination of a Liposomal Drug by Small-Angle X-ray Scattering Using Continuous Contrast Variation

Langmuir ◽  
2016 ◽  
Vol 32 (3) ◽  
pp. 772-778 ◽  
Author(s):  
Raul Garcia-Diez ◽  
Christian Gollwitzer ◽  
Michael Krumrey ◽  
Zoltan Varga
Keyword(s):  
Small Angle ◽  
Size Determination ◽  
Contrast Variation ◽  
Liposomal Drug ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

Simultaneous size and density determination of polymeric colloids by continuous contrast variation in small angle X-ray scattering

2016 ◽  
Vol 81 ◽  
pp. 641-649 ◽  
Author(s):  
Raul Garcia-Diez ◽  
Aneta Sikora ◽  
Christian Gollwitzer ◽  
Caterina Minelli ◽  
Michael Krumrey
Keyword(s):  
Small Angle ◽  
Contrast Variation ◽  
X Ray ◽  
Density Determination ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Structure of Nonionic Surfactant Diglycerol Monomyristate Micelles in Cyclohexane: a SAXS Study

1970 ◽  
Vol 23 ◽  
pp. 74-81
Author(s):  
Lok Kumar Shrestha
Keyword(s):  
Nonionic Surfactant ◽  
Small Angle ◽  
Water Addition ◽  
Saxs Data ◽  
Cross Sectional ◽  
X Ray ◽  
X Ray Scattering ◽  
Added Water ◽  
Trace Water ◽  
Ray Scattering

Structure of nonionic surfactant diglycerol monomyristate (C14G2) micelles in cyclohexane has been investigated by small-angle X-ray scattering (SAXS) technique. Structural modulation of reverse micelle (RM) has been systematically studied by changing composition, temperature change and added-water. The SAXS data were evaluated by the generalized indirect Fourier transformation (GIFT) method, which gives pair-distance distribution function (PDDF). Unlike conventional poly(oxyethylene) type nonionic surfactants, C14G2 forms RM in cyclohexane without water addition at normal room temperature. A clear indication of one dimensional (1-D) micellar growth was found with increasing C14G2 concentrations. On the other hand, temperature induced cylinder-to-sphere type transition in the RM structure. The maximum dimension and the cross-sectional diameter of the RM increased upon addition of trace water indicating the formation of water pool in the reverse micellar core.Keywords: Diglycerol monomyristate, small-angle X-ray scattering, reverse micelles.DOI: 10.3126/jncs.v23i0.2099J. Nepal Chem. Soc., Vol. 23, 2008/2009Page: 74-81

Small Angle X-ray Scattering Studies of Polymeric Zirconium Species in Aqueous Solution

1990 ◽  
Vol 180 ◽  
Author(s):  
J.A. Jutson ◽  
R.M. Richardson ◽  
S.L. Jones ◽  
C. Norman
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Small Angle ◽  
Cross Sectional ◽  
Zirconyl Chloride ◽  
X Ray ◽  
X Ray Scattering ◽  
Varying Length ◽  
Shape And Size ◽  
Ray Scattering

ABSTRACTSmall angle X-ray scattering techniques have been used to investigate the shape and size distribution of Zr(IV) species in aqueous solution. This study has shown that when zirconyl chloride solutions, containing the zirconyl tetramer, are subjected to various treatments polymerisation occurs. While ageing and addition of base produces an increase in particle size the shape remains globular. Refluxing the solutions produces “rod” like particles of varying length but constant cross sectional radius.

Nanoparticle characterization by continuous contrast variation in small-angle X-ray scattering with a solvent density gradient

2015 ◽  
Vol 48 (1) ◽  
pp. 20-28 ◽  
Author(s):  
Raul Garcia-Diez ◽  
Christian Gollwitzer ◽  
Michael Krumrey
Keyword(s):  
Density Gradient ◽  
Electron Density ◽  
Small Angle ◽  
Glass Capillary ◽  
Contrast Variation ◽  
X Ray ◽  
X Ray Scattering ◽  
Novel Approach ◽  
Solvent Density ◽  
Ray Scattering

Many low-density nanoparticles show a radial inner structure. This work proposes a novel approach to contrast variation with small-angle X-ray scattering based on the constitution of a solvent density gradient in a glass capillary in order to resolve this internal morphology. Scattering curves of a polymeric core–shell colloid were recorded at different suspending medium contrasts at the four-crystal monochromator beamline of PTB at the synchrotron radiation facility BESSY II. The mean size and size distribution of the particles as well as an insight into the colloid electron density composition were determined using the position of the isoscattering points in the Fourier region of the scattering curves and by examining the Guinier region in detail. These results were corroborated with a model fit to the experimental data, which provided complementary information about the inner electron density distribution of the suspended nanoparticles.

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