• Crosslinked GelCrosslinked Gel ... Borate • Simple Salt (HBO & Borate ChelatedChelatedCompounds • Simple Salt (H BO –– Retard OxideRetard Oxide FormationFormation • Crosslinking RateCrosslinking Rate ... Crosslinked and Linear Gel Composition Author: Richard Hodge, ConocoPhillips
Borate crosslinked gel fracturing fluids utilize borate ions to crosslink the hydrated polymers and provide increased viscosity. The crosslink obtained by using borate is reversible and is triggered by altering the pH of the fluid system.
fluid. Borate gels will normally cross-link at a pH of between 8.5 and 9.0. Temperatures for borate fluids are generally limited to wells with a BHST of 140 degrees Fahrenheit, but with proper testing can be designed for use at much higher temperatures. Once cross-linked, borate gels can develop in excess of 2,000 cps of viscosity.
show all hide all. Introduction. The effectiveness of Bora-Care in a gel form for sealed or hard-to-reach wood. Jecta is a ready-to-use injectable borate gel used by pest management professionals to protect sealed or inaccessible wood from termites and other wood destroying organisms.
The gel network was formed through the crosslinking reaction between borate ions dissociated from organic borate and the cis-diol hydroxyl groups on the mannose units of polysaccharide chains. The rheological properties of the complex gels were studied by dynamic viscoelastic measurement.
When a crosslinker, typically made of borate or metal compounds such as zirconium (Zr) and titanium (Ti) compounds, is added to a linear fluid, the crosslinking species form bonding among polymer chains, resulting in a viscous crosslinked fluid with enhanced gel viscosity and improved high temperature stability.
A crossed-link polymer. By Colin Baker 1 January 2005. No comments. ... hydrolyses to form a boric acid-borate ion solution with a pH of about nine. ... After a few minutes a gel is formed which can be lifted out with the glass rod. Repeat with different volume ratios to investigate the amount of cross-linking.
TAE or TBE, which is best? Well, of course, it depends on what you want to do. Here are the pros and cons of both: TBE (Tris-borate-EDTA) is a better conductive medium than TAE (Tris-acetate EDTA) so is less prone to overheating so use TBE for long runs Borate is an enzyme inhibitor so TBE…
Help us to eliminate this tragedy by spreading the word about this method for faster, cooler DNA gels. You can do this by clicking the link below this article to e-mail it to your molecular biologist friends. We, and they, thank you for your help. Further reading: 1. Brody and Kern(2004) Biotechniques 36 p214 2.
Borax forms the borate ion when in solution. This ion has the structure: The borate ion can make weak bonds with the OH groups in the polymer chains so it can link the chains together as shown below. This is called cross-linking: Slime is a non-Newtonian fluid that is dilatant – ie under stress, the material dilates or expands.