Charge-Stabilized Liquidlike Ordered Binary Colloidal Suspensions. 2. Partial Structure Factors Determined by Small-Angle Neutron Scattering

Langmuir ◽  
1999 ◽  
Vol 15 (2) ◽  
pp. 345-352 ◽  
Author(s):  
N. Lutterbach ◽  
H. Versmold ◽  
V. Reus ◽  
L. Belloni ◽  
Th. Zemb ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Colloidal Suspensions ◽  
Partial Structure ◽  
Structure Factors

scholarly journals Simultaneous light and small-angle neutron scattering on aggregating concentrated colloidal suspensions

2003 ◽  
Vol 36 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Sara Romer ◽  
Claus Urban ◽  
Vladimir Lobaskin ◽  
Frank Scheffold ◽  
Anna Stradner ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Dynamic Properties ◽  
Sol Gel ◽  
Colloidal Suspensions ◽  
Gel Point ◽  
Local Dynamic ◽  
Colloidal Systems ◽  
High Concentration

A new sample environment has been developed in order to perform light and small-angle neutron scattering (SANS) simultaneously on colloidal systems. The combination of SANS and diffusing wave spectroscopy (DWS) is of particular use in the high-concentration regime. DWS provides information on the local dynamic properties of the individual particles, whereas SANS gives access to the structural properties on similar length scales. The combination of both methods thus allows one to obtain structural and dynamic information over a very large range of length and time scales. Using this new setup, the onset of aggregation and the sol–gel transition in concentrated destabilized polystyrene sphere suspensions have been investigated. At the gel point, a dramatic change of the particle dynamics from diffusion to a subdiffusive arrested motion is observed. However, while the DWS measurements indicate that dramatic changes in the local dynamics occur over a long period, the SANS pattern quickly reaches its final appearance. The SANS experiments thus indicate that a fluid-like structure is arrested in the course of the gel formation. The data are found to be in good qualitative agreement with computer simulations.

Structural transitions of hard-sphere colloids studied by spin-echo small-angle neutron scattering

2003 ◽  
Vol 36 (6) ◽  
pp. 1417-1423 ◽  
Author(s):  
Timofei Krouglov ◽  
Wim G. Bouwman ◽  
Jeroen Plomp ◽  
M. Theo Rekveldt ◽  
Gert Jan Vroege ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Hard Sphere ◽  
Small Angle Neutron Scattering ◽  
Crystalline State ◽  
Spin Echo ◽  
Colloidal Suspensions ◽  
Real Space ◽  
Concentrated Suspension ◽  
Dilute Suspension

The structure of hard-sphere colloidal suspensions is measured at different concentrations using the recently developed spin-echo small-angle neutron scattering (SESANS) technique. It is shown that SESANS measures real-space correlations ranging from the size of a single particle for a dilute suspension to several particle diameters for a concentrated suspension, glass and crystalline state.

Nano-Structural Studies on Fe3O4 Particles Dispersing in a Magnetic Fluid Using X-Ray Diffractometry and Small-Angle Neutron Scattering

2015 ◽  
Vol 827 ◽  
pp. 213-218 ◽  
Author(s):  
Ahmad Taufiq ◽  
Sunaryono ◽  
Edy Giri Rachman Putra ◽  
Suminar Pratapa ◽  
Darminto
Keyword(s):  
Neutron Scattering ◽  
Magnetic Fluid ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Colloidal Suspension ◽  
Lattice Parameter ◽  
Fractal Model ◽  
X Ray ◽  
Structure Factors ◽  
Co Precipitation

Ferrofluid (magnetite/Fe3O4magnetic fluid) is colloidal suspension containing Fe3O4nanoparticles dispersed in a liquid carrier. In this work, Fe3O4particles in the fluid have been prepared by a simple co-precipitation route. The nano-structural behaviors such as phase purity and crystal structure of magnetite particles in ferrofluid were studied by means of X-ray diffractometry (XRD). Meanwhile, the form and structure factors were investigated by small-angle neutron scattering (SANS) spectrometer. The XRD pattern confirmed a single phase of spinel cubic Fe3O4structure. Further XRD data analysis revealed that the magnetite has a lattice parameter of 8.38 Å. The SANS data was fitted by applying a lognormal spherical calculation as a form factor and a mass fractal model as a structure factor. It showed that the magnetite ferrofluid has primary particles of 7.6 nm in diameter with fractal dimension of 1.2, which can be associated with chain-like structure. The chain-like structured Fe3O4ferrofluid based on local natural iron sand in this work opens new opportunities to be applied for novel prospective applications.

Theoretical studies on the structure of interacting colloidal suspensions by spin-echo small angle neutron scattering

2010 ◽  
Vol 132 (17) ◽  
pp. 174509 ◽  
Author(s):  
Xin Li ◽  
Chwen-Yang Shew ◽  
Yun Liu ◽  
Roger Pynn ◽  
Emily Liu ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Echo ◽  
Colloidal Suspensions ◽  
Theoretical Studies
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