All‐Aqueous Freeform Fabrication of Perfusable Self‐Standing Soft Compartments. Issue 31 (29th June 2022)

• Record Type: Journal Article
• Authors: Gonçalves, Raquel C.; Vilabril, Sara; Neves, Catarina M. S. S.; Freire, Mara G.; Coutinho, João A. P.; Oliveira, Mariana B.; Mano, João F.
• Is Part Of: Advanced materials. Volume 34:Issue 31(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-06-29
• Subjects: all‐aqueous fabrication -- aqueous two‐phase systems -- cell encapsulation -- interfacial complexation -- tubular/hollow materials; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202200352
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Compartmentalized structures obtained in all‐aqueous settings have shown promising properties as cell encapsulation devices, as well as reactors for trans‐membrane chemical reactions. While most approaches focus on the preparation of spherical devices, advances on the production of complex architectures have been enabled by the interfacial stability conferred by emulsion systems, namely mild aqueous two‐phase systems (ATPS), or non‐equilibrated analogues. However, the application of non‐spherical structures has mostly been reported while keeping the fabricated materials at a stable interface, limiting the free‐standing character, mobility and transposition of the obtained structures to different setups. Here, the fabrication of self‐standing, malleable and perfusable tubular systems through all‐aqueous interfacial assembly is shown, culminating in the preparation of independent objects with stability and homogeneity after disruption of the polymer‐based aqueous separating system. Those hollow structures can be fabricated with a variety of widths, and rapidly printed as long structures at flow rates of 15 mm s −1 . The materials are used as compartments for cell culture, showcasing high cytocompatibility, and can be tailored to promote cell adhesion. Such structures may find application in fields that benefit from freeform tubular structures, including the biomedical field with, for example, cell encapsulation, and benchtop preparation of microfluidic devices. Abstract : A straightforward method based on the interfacial complexation of oppositely charged natural polyelectrolytes is proposed to directly fabricate fiber‐shaped structures, stable in all‐aqueous physiological‐relevant conditions. Perfusable and size‐controllable materials can be obtained, with adequate permeability and improved biofunctionality, enabling cell adhesion and growth. Outside the separating interface of two‐phase systems, self‐standing entities can be easily handled, broadening the range of applications.