Sensors and Materials
ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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A Real-time Rheological Measurement for Biopolymer 3D-printing Process

A. Yokpradit, T. Tongloy, S. Kaewpirom, and S. Boonsang

(Received December 18, 2017; Accepted July 27, 2018)

Keywords: 3D-bioprinting, biopolymer fluid dispensing, volume flow rate, tissue engineering, biopolymer, user interface

Biopolymers combined with 3D printing technology for tissue engineering have been extensively used in many biomedical applications such as organ and tissue regeneration. The 3D printing technology generally relies on the continuous dispensing process which is usually known as the complicated dynamic processes. This is primarily caused by the rheological properties of materials. In addition, the substantial concern for biopolymers printing is the time-dependent variation of material properties such as viscosity during the printing process. The variation of the rheological properties significantly affects the printing process especially the volume flow rate control. In general, the measurement of rheological properties is carried out before the dispensing process. The fluid flow control setting up is usually performed according to parameters derived from the pre-measured rheological values. However, using such a method, it may not provide optimized parameters for printing control with some biopolymers. An innovative method of measuring rheological properties is proposed in this paper. An image processing procedure is employed to determine the fluid flow at a certain time in the fluid dispensing process. Experiments were carried out in which the rheological properties of poly-(vinyl alcohol) (PVA) and poly-(vinyl alcohol)/chitosan (PVA/CS) aqueous solutions used for dispensing the polymers were evaluated at different time-stamp and applied pressures. The measured flow rates were used to construct a pressure-dependent fluid flow rate curve as a function of time to identify the rheological properties of fluid materials under specific times and conditions.

Corresponding author: Siridech Boonsang




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