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  • Title: 3D printing of Pickering emulsions, Pickering foams and capillary suspensions - A review of stabilization, rheology and applications.
    Author: Tyowua AT, Harbottle D, Binks BP.
    Journal: Adv Colloid Interface Sci; 2024 Oct; 332():103274. PubMed ID: 39159542.
    Abstract:
    Pickering emulsions and foams as well as capillary suspensions are becoming increasingly more popular as inks for 3D printing. However, a lack of understanding of the bulk rheological properties needed for their application in 3D printing is potentially stifling growth in the area, hence the timeliness of this review. Herein, we review the stability and bulk rheology of these materials as well as the applications of their 3D-printed products. By highlighting how the bulk rheology is tuned, and specifically the inks storage modulus, yield stress and critical balance between the two, we present a rheological performance map showing regions where good prints and slumps are observed thus providing clear guidance for future ink formulations. To further advance this field, we also suggest standard experimental protocols for characterizing the bulk rheology of the three types of ink: capillary suspension, Pickering emulsion and Pickering foam for 3D printing by direct ink writing.
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