scholarly journals Morphology and Rheology of a Cool-Gel (Protein) Blended with a Thermo-Gel (Hydroxypropyl Methylcellulose)

Foods ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 128
Author(s):  
Zhili Ji ◽  
Long Yu ◽  
Qingfei Duan ◽  
Song Miao ◽  
Hongsheng Liu ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Correlation Length ◽  
Rheological Behavior ◽  
Small Angle ◽  
Hydroxypropyl Methylcellulose ◽  
Fluorescence Microscope ◽  
Gel Properties ◽  
X Ray ◽  
Gelling Temperature ◽  
X Ray Scattering

This study investigates the morphological and rheological properties of blended gelatin (GA; a cooling-induced gel (cool-gel)) and hydroxypropyl methylcellulose (HPMC; a heating-induced gel (thermo-gel)) systems using a fluorescence microscope, small angle X-ray scattering (SAXS), and a rheometer. The results clearly indicate that the two biopolymers are immiscible and have low compatibility. Moreover, the rheological behavior and morphology of the GA/HPMC blends significantly depend on the blending ratio and concentration. Higher polysaccharide contents decrease the gelling temperature and improve the gel viscoelasticity character of GA/HPMC blended gels. The SAXS results reveal that the correlation length (ξ) of the blended gels decreases from 5.16 to 1.89 nm as the HPMC concentration increases from 1 to 6%, which suggests that much denser networks are formed in blended gels with higher HPMC concentrations. Overall, the data reported herein indicate that the gel properties of gelatin can be enhanced by blending with a heating-induced gel.

Small-angle X-ray scattering study on correlation length and density fluctuations in a supercritical CO2–water mixture

2002 ◽  
Vol 198 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Jianling Zhang ◽  
Juncheng Liu ◽  
Liang Gao ◽  
Xiaogang Zhang ◽  
Zhenshan Hou ◽  
...  
Keyword(s):  
Correlation Length ◽  
Small Angle ◽  
Supercritical Co2 ◽  
Density Fluctuations ◽  
Water Mixture ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

scholarly journals Increasing correlation length in bulk supercooled H2O, D2O, and NaCl solution determined from small angle x-ray scattering

2010 ◽  
Vol 133 (13) ◽  
pp. 134504 ◽  
Author(s):  
Congcong Huang ◽  
T. M. Weiss ◽  
D. Nordlund ◽  
K. T. Wikfeldt ◽  
L. G. M. Pettersson ◽  
...  
Keyword(s):  
Correlation Length ◽  
Small Angle ◽  
Nacl Solution ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering

scholarly journals Monovalent Salt and pH-Induced Gelation of Oxidized Cellulose Nanofibrils and Starch Networks: Combining Rheology and Small-Angle X-Ray Scattering

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 951
Author(s):  
Kazi M. Zakir Hossain ◽  
Vincenzo Calabrese ◽  
Marcelo A. da da Silva ◽  
Saffron J. Bryant ◽  
Julien Schmitt ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Small Angle ◽  
Cellulose Nanofibrils ◽  
Salt Content ◽  
Quality Parameters ◽  
X Ray ◽  
X Ray Scattering ◽  
Aggregation Behaviour ◽  
The Stability ◽  
Ray Scattering

Water quality parameters such as salt content and various pH environments can alter the stability of gels as well as their rheological properties. Here, we investigated the effect of various concentrations of NaCl and different pH environments on the rheological properties of TEMPO-oxidised cellulose nanofibril (OCNF) and starch-based hydrogels. Addition of NaCl caused an increased stiffness of the OCNF:starch (1:1 wt%) blend gels, where salt played an important role in reducing the repulsive OCNF fibrillar interactions. The rheological properties of these hydrogels were unchanged at pH 5.0 to 9.0. However, at lower pH (4.0), the stiffness and viscosity of the OCNF and OCNF:starch gels appeared to increase due to proton-induced fibrillar interactions. In contrast, at higher pH (11.5), syneresis was observed due to the formation of denser and aggregated gel networks. Interactions as well as aggregation behaviour of these hydrogels were explored via ζ-potential measurements. Furthermore, the nanostructure of the OCNF gels was probed using small-angle x-ray scattering (SAXS), where the SAXS patterns showed an increase of slope in the low-q region with increasing salt concentration arising from aggregation due to the screening of the surface charge of the fibrils.

scholarly journals Rheological properties and small-angle X-ray scattering studies of phosphate dust obtained from baghouse collectors

2019 ◽  
Vol 29 (1) ◽  
pp. 196-201
Author(s):  
Ikram Labtaini ◽  
Khalil El-Hami
Keyword(s):  
Calcium Phosphate ◽  
Rheological Behavior ◽  
Small Angle ◽  
Mass Concentration ◽  
Solid Mass ◽  
Filter Media ◽  
X Ray ◽  
X Ray Scattering ◽  
Three Samples ◽  
Ray Scattering

AbstractBaghouse dust collectors are using in the drying unit of Beni Idir situated in Beni-Idir Khouribga city, Morocco, to retrieve phosphates particles from dust air-drying before its expulsion through the smokestacks. The phosphate dust samples used in this study were taken from the filtration chamber of the baghouse dust collectors. The first sample (S1) is untreated calcium phosphate dust, the second (S2) is the calcium phosphate dust from the outside of filter media while the third one (S3) is the calcium phosphate dust from the inside of filter media which causes clogging depth. In this paper, the rheology and the small-angle X-ray scattering (SAXS) of the three samples were investigated to elucidate the changes in terms of local structure, the viscosity, and the shear stress parameters. The rheological behavior of the dust samples was investigated for a solid mass concentration ranging from 50 to 60%, the three samples (S1) (S2) and (S3) had a solid mass concentration of C1=60%, C2=55% and C3=50% and a shear rate in the range from 1 to 1000 s−1. The results indicated that during the filtration process, the pseudo-plastic behavior of the dust phosphate changed to that of Bingham. Comparing the results of the sample’s viscosity, we found that the viscosity decreased during the process filtration. The SAXS results suggested that the dust phosphate samples possess a fractal surface structure of enormous dust particles with a rough surface interface. This new study highlights the rheological behavior of grain phosphates that could be extrapolated to other mining powder as grains material or in solution. It is important to understand the rheological characteristics of materials, their flow, and the subsequent deformation of matter as a result of the flow.

A Revised O2 Reduction Model in Li-O2 Batteries as Revealed by in Situ Small Angle X-Ray Scattering

2019 ◽  
Author(s):  
Christian Prehal ◽  
Aleksej Samojlov ◽  
Manfred Nachtnebel ◽  
Manfred Kriechbaum ◽  
Heinz Amenitsch ◽  
...  
Keyword(s):  
Small Angle ◽  
Wide Angle ◽  
Reduction Mechanism ◽  
Reduction Model ◽  
X Ray ◽  
X Ray Scattering ◽  
O2 Reduction ◽  
Ray Scattering

<b>Here we use in situ small and wide angle X-ray scattering to elucidate unexpected mechanistic insights of the O2 reduction mechanism in Li-O2 batteries.<br></b>

In situ Time-Resolved Small-Angle X-ray Scattering Reveals the Formation Kinetics of Polyelectrolyte Complex Micelles

2019 ◽  
Author(s):  
Hao Wu ◽  
Jeffrey Ting ◽  
Siqi Meng ◽  
Matthew Tirrell
Keyword(s):  
Small Angle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Polyelectrolyte Complex ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

We have directly observed the <i>in situ</i> self-assembly kinetics of polyelectrolyte complex (PEC) micelles by synchrotron time-resolved small-angle X-ray scattering, equipped with a stopped-flow device that provides millisecond temporal resolution. This work has elucidated one general kinetic pathway for the process of PEC micelle formation, which provides useful physical insights for increasing our fundamental understanding of complexation and self-assembly dynamics driven by electrostatic interactions that occur on ultrafast timescales.

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