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Virtual poster session

Rheology of a hydrogel-ink, printing fidelity and elastic behavior of 3D-printed scaffolds

Wednesday (07.10.2020)
19:28 - 19:31 Room 1
Part of:
Line-Up:
18:40 Virtual poster session Development of CFRP - hybrid foam composites for improved light-weight design of electric vehicles 1 Joachim Baumeister
18:43 Virtual poster session Study of the thermal conductivity of powdered microcellular polymers based on PMMA 1 Ph.D. Ismael Sánchez
18:46 Virtual poster session Manufacturing of functional aluminium matrix syntactic foams 1 Alexandra Kemény
18:49 Virtual poster session Manufacturing and comparison of AlSi12 matrix unimodal and bimodal syntactic metal foams 1 Borbála Leveles
18:52 Virtual poster session The effect of elastomer viscosity in pp/poe foams produced by core-back injection moulding over impact properties 1 Ph.D. Santiago Muñoz Pascual
18:55 Virtual poster session Modelling of the mechanisms of heat transfer in glass foams at different temperatures 1 Paula Cimavilla-Román
18:58 Virtual poster session Thermal conductivity of polyisocyanurate foams (PIR) produced using hydrofluoroolefins (HFOs) as blowing agents 1 Ph.D. Patricia Torres
19:01 Virtual poster session Multiscale modeling of biopolymer aerogels 1 Dr.-Ing. Ameya Rege
19:04 Virtual poster session On the way to mass production of unit-cell based auxetic materials 1 Angela Schwarz
19:07 Virtual poster session Wavy knits – enabling the production of auxetic materials 1 Angela Schwarz
19:10 Virtual poster session Influence of Sample Size on Dynamic Compression of Metal Syntactic Foams 1 Nima Movahedi
19:13 Virtual poster session Synthesis of new non-isocyanate polyurethane foams based on cyclic triscarbonates and diamines 1 Ph.D. Mercedes Santiago-Calvo
19:16 Virtual poster session Formation of monodisperse surfactant foams 1 Prof. Dr. Rumen Krastev
19:19 Virtual poster session Analysis of a AlMg2.5 matrix syntactic foam produced via thixoinfiltration of loosely packed and micro structured recycled balloons 1 João Paulo Paschoal
19:22 Virtual poster session In-situ observation of combustion foaming process for synthesizing porous Al3Ti by X-ray radioscopy 1 Takamasa Inukai
19:25 Virtual poster session Characterization of 3D printed PHBV+BG scaffolds for bone regeneration 1 Prof. Dr. Elida B. Hermida
19:28 Virtual poster session Rheology of a hydrogel-ink, printing fidelity and elastic behavior of 3D-printed scaffolds 1 Prof. Dr. Elida B. Hermida
19:31 Virtual poster session Keratinocytes hacat proliferation on 3D-printed chitosan-collagen scaffolds 1 Prof. Dr. Elida B. Hermida
19:34 Virtual poster session The microhardness and microstructure studies on the sintered open-cell nickel foam 0 Faeze Barzegar
19:37 Virtual poster session Characterization of porous titanium implants produced by 3D printer technique 0 Dr. Akram Salehi
19:40 Virtual poster session Adapting polymer derived ceramic membranes for emulsification process 1 Natália Cristina Fontão
19:43 Virtual poster session Poster discussion in video chat rooms 0
Session Chair


Session V.1: Session 1
Belongs to:
General Topic V: Virtual poster session


Recently, 3D bioprinting has emerged as a flexible tool with great potential in various tissue engineering and regenerative medicine applications. Natural hydrogels are widely implemented for this purpose due to their biocompatibility, crosslinking capability and good bioresorption.

In this work we studied the printing fidelity and rheological properties of gelatine-alginate-hyaluronic ink, as well as the elastic behavior and cytocompatibility of 3D-printed scaffolds. Ink printability, Pr, was defined as the ratio between the area of pores of a printed grid and the area of the design. Rotary and oscillatory tests were performed at 37°C in a rheometer in the Small Amplitude Oscillatory Shear (SAOS) mode. Creep tests were performed at 41°C, 37°C, 33°C, and 29°C; recorded curves were adjusted with a generalized Kelvin model with two relaxation times; the temperature dependence of these times was fitted by Arrhenius´ law. After crosslinking the 3D-printed with CaCl2 the mechanical response was measured with a Dynamical Mechanical Analyzer. Additionally cytocompatibility were assessed growing DiO labelled NIH/3T3 fibroblasts on printed scaffolds for 48h.

Inks depicted a pseudoplastic behavior with thermo-responsive gelation point of gelatine at 25°C, leading to self supported structures during 3D-printing and good printing fidelity (Pr=0.91±0.06). During the 3D-printing process the ink cartridge was at 37°C for and the plate at room temperature. The height of the extruded filament, measured as a function of time, was compared with the equation that predicts the creep at different temperatures. This prediction was significantly similar to height measurements.

Mechanical characterization of scaffolds evidenced a tensile module of (0.13±0.01 MPa). Fibroblast cells could attach and grow on the surface of scaffolds, revealing cytocompatibility of final products. Herein reported self-supported 3D-printed scaffolds could be considered for soft tissues regeneration, such as skin, muscle and endothelium, taking into account their elastic modulus and their cytocompatibility.

Speaker:
Prof. Dr. Elida B. Hermida
National University of San Martin - UNSAM
Additional Authors:
  • Joaquin Palma
    UBA / UNSAM
  • Dr. Marcos Bertuola
    UNSAM-CONICET

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