A Small- and Wide-Angle X-ray Scattering (SWAXS) beamline (BL-18) is installed and commissioned at a 1.5 T bending magnet port (5°) of Indus-2 synchrotron at RRCAT, Indore, India. The ∼40-m-long beamline has tunable x-ray energy in the range of 5–20 keV by using a double crystal monochromator. A 1.5-m-long toroidal mirror is used to focus the x-ray beam at the detector position. The beamline is equipped with a 6-m-long movable detector stage to access different wave-vector transfer ranges. At present, an online image plate area detector and a linear position-sensitive gas detector are installed for Small-Angle X-ray Scattering (SAXS) and Wide-Angle X-ray Scattering (WAXS) measurements, respectively. The beamline is operational in simultaneous SAXS/WAXS mode to probe the mesoscopic as well as molecular level structure over a wide range of wave-vector transfer. The specification of the beamline and its performance are reported here. A few recent experimental results, as obtained from BL-18, are also described in brief.
For various industrial processes, the stabilization of an oil phase is crucial and it demands a proper balance of complex interactions in an emulsion system. In Pickering emulsions, this is...
Understanding the deposition pattern
formed by an evaporated colloidal
drop is of fundamental and technological interest. Such an evaporative
process is important in various applications starting from inkjet
printing to disease diagnosis. In this work, it is shown that the
deposit pattern on a porous membrane can be tuned by varying the colloidal
viscosity and membrane pore size. We have used small-angle X-ray scattering
(SAXS) in scanning mode for profiling of deposit morphology and also
for estimation of the interparticle correlation. It is demonstrated
that low viscosity and small pore size favor a centrally dipped pattern
owing to the coffee ring effect, which can be modified to a contrasting
centrally peaked pattern by increasing the viscosity and pore size.
To comprehend the experimental observations, a computer model has
been developed using a continuity equation that well corroborates
the experimental observations on the final deposited pattern and also
provides the time evolution of the pattern. The work provides a way
to tune the pattern of colloidal stain on a porous substrate by controlling
flow and absorption.
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