Guar gum/borax hydrogel: Rheological, low field NMR and release characterizations

Study of Hydration Kinetics and Rheological Behaviour of Guar Gum

BACKGROUND Guar galactomannan is a plant polysaccharide with extensive applications in food, paper, textile and petroleum industries. The main advantages for using guar are its low cost, easy availability and capacity to form viscous solutions and gels at low concentration. Additionally, chain architecture of guar galactomannan can be selectively modified to tailor properties of guar formulatio...

Mechanical, rheological and release behaviors of a poloxamer 407/ poloxamer 188/carbopol 940 thermosensitive composite hydrogel.

The aims of this study were to prepare a thermosensitive composite hydrogel (TCH) by mixing 24% (w/v) poloxamer 407 (P407), 16% (w/v) poloxamer 188 (P188) and 0.1% (w/v) carbopol 940 (C940), and to determine the effect of natural borneol/ (2-hydroxypropyl)-β-cyclodextrin (NB/HP-β-CD) inclusion complex on the phase transition temperature, mechanical, rheological properties, and release behaviors...

Guar and Guar Derivatives

Characterization of Shales with Low Field Nmr

Nuclear Magnetic Resonance (NMR) relaxation methods are key techniques for evaluating shales, both from cores and logging data. First, very small pore sizes, down to nano-meter length scales, can be detected and quantified if the NMR tool has the ability to measure relaxation times in the range [0.1 – 1 ms], and second the different proton populations (water, oil, gas, organic matter) can be di...

Permanent Magnet Arrangements for Low-Field NMR

For low-field NMR, NdFeB permanent magnet arrangements are proposed to provide the static polarizing magnetic field. Especially a parallel and a circular arrangement of the permanent magnets, iron yokes and small shim magnets were tested and improved by COMSOL. The intent was to guide the design and the construction of NMR magnets by calculating the magnetic field strength and the associated fi...