Micellar super-structure in magnetically aligned lyotropic liquid crystals studied by light scattering

1979 ◽  
Vol 57 (9) ◽  
pp. 1108-1110 ◽  
Author(s):  
Paulo C. Isolani ◽  
Leonard W. Reeves ◽  
J. Atílio Vanin
Keyword(s):  
Liquid Crystals ◽  
Light Scattering ◽  
Laser Light ◽  
Angular Separation ◽  
Average Diameter ◽  
Laser Light Scattering ◽  
Lyotropic Liquid Crystals ◽  
Type Ii ◽  
X Ray ◽  
Magnetically Aligned

Depolarized components of laser light scattering patterns have been investigated for type II lyotropic liquid crystals. These patterns are characterized by intensity maxima and minima with constant angular separation. By using the Bragg equation, a set of distances typical for lamellar arrays can be derived. Two possible models are proposed to explain the results: the first is that the distances are related to the average diameter of lyomesomorphic micelles not accessible to low angle X-ray studies and the second model is a repeating hyperstructure of micellar microdomains.

Probing the Early Stages of Melt Crystallization in Polypropylene by Simultaneous Small- and Wide-Angle X-ray Scattering and Laser Light Scattering

2000 ◽  
Vol 33 (3) ◽  
pp. 978-989 ◽  
Author(s):  
Zhi-Gang Wang ◽  
Benjamin S. Hsiao ◽  
Eric B. Sirota ◽  
Pawan Agarwal ◽  
Srivatsan Srinivas
Keyword(s):  
Light Scattering ◽  
Laser Light ◽  
Laser Light Scattering ◽  
Wide Angle ◽  
Melt Crystallization ◽  
X Ray ◽  
Early Stages ◽  
X Ray Scattering ◽  
Ray Scattering

High-pressure cell for simultaneous small-angle x-ray scattering and laser light scattering measurements

2001 ◽  
Vol 72 (6) ◽  
pp. 2679-2685 ◽  
Author(s):  
Tadanori Koga ◽  
Shuiqin Zhou ◽  
Benjamin Chu ◽  
John L. Fulton ◽  
Shu Yang ◽  
...  
Keyword(s):  
High Pressure ◽  
Light Scattering ◽  
Small Angle ◽  
Laser Light ◽  
Laser Light Scattering ◽  
High Pressure Cell ◽  
X Ray ◽  
Pressure Cell ◽  
X Ray Scattering ◽  
Scattering Measurements

Premonitory Martensitic Surface Relief Via Novel X-Ray Diffuse and Laser Light Reflectivity from The (001)-Surface of A Ni63Al37Single Crystal

1999 ◽  
Vol 580 ◽  
Author(s):  
U. Klemradt ◽  
M. Aspelmeyer ◽  
H. Abe ◽  
L.T. Wood ◽  
S.C. Moss ◽  
...  
Keyword(s):  
Light Scattering ◽  
Martensitic Transformation ◽  
Temperature Interval ◽  
Laser Light ◽  
Isothermal Holding ◽  
Laser Light Scattering ◽  
X Ray ◽  
In Situ Experiments ◽  
First Time

AbstractBoth x-ray diffuse reflectivity and laser light scattering have been used to investigate the temperature-dependent surface behavior of a Ni63Al37 single crystal on different length scales. In-situ experiments were performed above the conventional martensitic start temperature Ms to search for premartensitic phenomena. X-ray experiments showed the presence of a surface precursor with second-order (continuous) character several 10 K above Ms. This premonitory effect corresponds to a height-height-correlation function which changes on the nanometer scale as the martensitic transformation is approached. At the martensitic transformation, the surface morphology changed from nanoscopic roughness to macroscopic relief within a temperature interval of less than 1 K via intermediate stages. Laser light scattering was employed to study time-dependent aspects of the athermal martensitic transformation above Ms. The occurrence of a martensitic transformation on isothermal holding after a certain incubation period was observed in Ni-Al for the first time. The measured incubation times increased by four orders of magnitude within a temperature interval of 0.5 K.

scholarly journals Determining the Aspect Ratio of Palygorskite by Dynamic Laser Light Scattering and X-Ray Diffraction Analysis Techniques

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Fei Xie ◽  
Jie Zhang ◽  
Jiyan Chen
Keyword(s):  
Light Scattering ◽  
Aspect Ratio ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Laser Light ◽  
Laser Light Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dynamic Laser Light Scattering

As a natural two-dimensional nanomaterial, palygorskite has been widely used in the fields of biology, chemical industry, medicine, and agriculture. Recently, more and more researchers point out that the aspect ratio of palygorskite directly affects the properties of its composite materials. Due to the large specific surface area and the tiny width of the palygorskite rod-like particles, it is difficult to obtain the aspect ratio information quickly and accurately by conventional means such as microphotography method and specific surface area method. In this paper, the length and width of the crystal is measured quickly and accurately by using dynamic laser light scattering technique and X-ray diffraction technique, so that the aspect ratio of the crystal can be calculated easily. It is recommended to analyze the crystallite size and microstrain of the diffraction pattern of palygorskite that using Pearson VII function, Caglioti equation, and average (LANGFORD) method, after comparing the three modes of W.-H. method. This feasible method has a good application prospect of the study of rod-like nanomaterials.

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