Factors affecting the rheological behaviour of carbomer …
2022年3月25日 · Carbomer dispersions must be neutralised to pH 5–9 (preferably pH 6.5–7.5) to achieve maximum gel viscosity (Lubrizol, 2009b). Thus, organic or inorganic bases are commonly used as pH neutralisers in carbomer formulations prepared in water.
The Influence of pH Values on the Rheological, Textural and …
For carbomer-based gels, the required pH value is obtained by neutralizing them with alkaline components, which leads to their structuring (thickening). This affects the physical properties of the gel, its residence time at the application site and the …
Maximum viscosity is typically achieved at a pH of 6.0 - 7.0. The viscosity of Carbopol® polymers will begin to decrease at a pH of 9.0 and higher. This is caused by the presence of excess electrolytes which affect the electrostatic repulsion of the ionized carboxylic groups.
Carbomers: Overview, recommendations, and formulating tips
2013年11月29日 · The optimum viscosity for Carbomer gels occurs at a PH of ~6-7. If the batch viscosity is too low, it is possible to add more Carbomer if you slurry the unneutralized Carbomer in water first before adding it to the batch.
Carbopol® and PemulenTM polymers must be neutralized in order to achieve maximum viscosity. Unneutralized dispersions have an approximate pH range of 2.5-3.5 depending on the polymer concentration. The unneutralized dispersions have very low viscosities, especially Carbopol® ETD and Carbopol® Ultrez polymers.
Overview: Application of Carbopol 940 in Gel - ResearchGate
2021年1月1日 · The concentration of Carbopol 940 as a gelling-agent can be varied to produce preparations that meet the criteria for gel physical properties such as pH, viscosity, adhesion, spreadability ...
Rheological characterization of topical carbomer gels …
The theological behavior of the Carbopol microgels do not change appreciably in the pH range 5.0-8.0, and the gels can be used as effective dermatological base for topical applications.
2015年7月18日 · The rheological properties of Carbomer and Polycarbophil gels were studied in relation to pH, Carbomer con-centration and brand, temperature, and dispersal medium composition. The study results permit rational selec-tion of Carbomers as gel-forming agents. Gel formation occurring on neutralization of Carbomer with alkali
Studies of Carbomer Gels Using Rotational Viscometry and Spin Probes
2015年12月6日 · The rheological properties of Carbomer and Polycarbophil gels were studied in relation to pH, Carbomer concentration and brand, temperature, and dispersal medium composition. The study results permit rational selection of Carbomers as gel-forming agents.
Carbomer 940 | Understanding Carbomer 940
2024年5月14日 · The gelling strength and viscosity of Carbomer 940 are influenced by the formulation’s pH level, which ideally should be maintained between 5.0 to 10.0 for optimal gel integrity and effectiveness. Carbomer 940 in Cosmetic Products