Pickering Aqueous Foam Stabilized by Rice Bran Wax Byproduct: A Sustainable and Multiscale Approach.

Area of Science:

• Materials Science
• Colloid and Surface Chemistry
• Sustainable Chemistry

Background:

• Aqueous foams are widely used but often rely on synthetic stabilizers.
• Rice bran wax (RBW) is a byproduct with potential for material applications.
• Pickering stabilization offers an alternative to traditional foam stabilization methods.

Purpose of the Study:

• To develop a sustainable and scalable method for creating rice bran wax (RBW)-stabilized aqueous foams.
• To characterize the physical properties and long-term stability of these RBW foams.
• To investigate the recyclability of RBW powder for repeated foam production.

Main Methods:

• A one-pot, energy-efficient process was used to create foams from RBW powder and water.
• Multiscale analysis characterized foam properties (e.g., density, firmness) across various concentrations (5-12 wt %).
• Microstructural analysis confirmed the Pickering effect, and foam drying/recycling experiments were conducted.

Main Results:

• Stable aqueous foams were successfully produced using only RBW powder and water.
• The 12 wt % RBW foam exhibited a dense structure (firmness 2 N, density ~0.5 g/mL) and remained stable for months.
• Dried RBW powder could be recovered and reused for multiple foam production cycles with minimal material loss.

Conclusions:

• Rice bran wax is an effective Pickering stabilizer for aqueous foams.
• The developed process is scalable, energy-efficient, and utilizes a sustainable byproduct.
• This research offers a promising route for eco-designed products and environmentally friendly Pickering foams.