Scattering Structure Factor of Colloidal Gels Characterized by Static Light Scattering, Small-Angle Light Scattering, and Small-Angle Neutron Scattering Measurements

Langmuir ◽  
2005 ◽  
Vol 21 (8) ◽  
pp. 3291-3295 ◽  
Author(s):  
Hua Wu ◽  
Jianjun Xie ◽  
Marco Lattuada ◽  
Massimo Morbidelli
Keyword(s):  
Light Scattering ◽  
Neutron Scattering ◽  
Small Angle ◽  
Structure Factor ◽  
Small Angle Neutron Scattering ◽  
Static Light Scattering ◽  
Colloidal Gels ◽  
Scattering Measurements ◽  
Small Angle Light Scattering

Ultra-small-angle neutron scattering from dense micrometre-sized colloidal systems: data evaluation and comparison with static light scattering

2006 ◽  
Vol 39 (2) ◽  
pp. 202-208 ◽  
Author(s):  
Josef Innerlohinger ◽  
Mario Villa ◽  
Matthias Baron ◽  
Otto Glatter
Keyword(s):  
Light Scattering ◽  
Neutron Scattering ◽  
Multiple Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Static Light Scattering ◽  
The Other ◽  
Data Evaluation ◽  
Scattering Data ◽  
Other Hand

Ultra-small-angle neutron scattering (USANS) probes the sameqregime as static light scattering (LS), making USANS an additional tool for the study of structures between 100 nm and 10 µm. Dense oil-in-water emulsions, which have already been characterized intensively by light scattering, are investigated in this study as a model system using USANS. The two basic problems of such scattering studies are the following: on the one hand, one has to use different scattering theories for USANS and LS, and on the other hand, in both cases one has to deal not only with particle interactions but also with multiple-scattering effects. For neutron scattering it is always possible to use the simpler Rayleigh–Debye–Gans (RDG) theory instead of the Lorenz–Mie theory, which generally describes light scattering from micrometre-sized globular objects. The samples have different contrasts in neutron and light scattering, such that only low-contrast (close to index match) LS data can be interpreted by the RDG theory. The data evaluation is performed by means of the generalized indirect Fourier transformation (GIFT) method, which enables the simultaneous calculation of the form and structure factors. The results are discussed and compared with those from light scattering experiments, taking into account the advantages of both methods. The effect of multiple scattering and its influence on data evaluation is also examined. Data evaluation by applying the GIFT method works well for both neutron and light scattering data, with results of comparable quality. The advantages of light scattering are the fast data acquisition and the large number of data points. USANS, on the other hand, covers a widerqrange and the problem of multiple scattering is not as severe as for light scattering, but still must not be neglected.

Small-Angle Neutron Scattering and 27Al Nmr Studies on the Microstructure and Composition of Alumina Sol-Gels

1990 ◽  
Vol 180 ◽  
Author(s):  
L. F. Nazar ◽  
D. G. Napier ◽  
D. Lapham ◽  
E. Epperson
Keyword(s):  
Light Scattering ◽  
Neutron Scattering ◽  
Acid Concentration ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Fractal Dimensions ◽  
Static Light Scattering ◽  
Scattering Data ◽  
Wide Range ◽  
Alumina Sol

ABSTRACTWe have used small angle neutron scattering, static light scattering and 27Al NMR to examine the structure and composition of alumina sol-gels formed by the hydrolysis of aluminum alkoxides. For LT sols at low acid concentrations, and HT gels over a wide range of acid concentration, 27Al solution NMR suggests, by the dearth of spectral resonances, that high molecular weight species are being formed. Analysis of the small angle neutron scattering data in the Porod regime indicates these sol-gels exhibit a power-law dependence consistent with mass fractal dimensions ranging from 1.45 to 1.8. These fractal dimensions are consistent with models based on diffusion limited cluster aggregation. The fractal dimensions do not differ significantly between LT and HT sols at the same acid concentration. However, for both temperature regimes, the fractal dimension increases with increasing acid concentration, suggesting a progression to a more compact network. Static light scattering measurements indicate the Guiner radii of the cluster aggregates vary from 600 to 2000Å.

Small Angle Neutron Scatitering Study of Sol-Gel Glasses

1989 ◽  
Vol 166 ◽  
Author(s):  
P. Wiltzius ◽  
S. B. Dierker
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Structure Factor ◽  
Small Angle Neutron Scattering ◽  
Sol Gel ◽  
Scattering Data ◽  
Length Scales ◽  
Internal Interface ◽  
Porous Glasses ◽  
Gel Glasses

ABSTRACTWe present small angle neutron scattering data of porous glasses. Analysis of the structure factor shows that the morphology on length scales between 30 A and 800 A depends on fabrication procedures. Fast gelation leads to a clumpy glass, whereas slow gelation produces a random smooth internal interface.

Small-angle neutron scattering and light scattering studies on the miscibility of protonated polyisoprene/deuterated polybutadiene blends

1991 ◽  
Vol 24 (8) ◽  
pp. 1813-1819 ◽  
Author(s):  
Hirokazu Hasegawa ◽  
Shinichi Sakurai ◽  
Mikihito Takenaka ◽  
Takeji Hashimoto ◽  
Charles C. Han
Keyword(s):  
Light Scattering ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering
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