Preparation of 3D Printed Chitosan/Polyvinyl Alcohol Double Network Hydrogel Scaffolds

2021 ◽  
pp. 2000398
Author(s):  
Fei Liu ◽  
Wenyu Li ◽  
Hongting Liu ◽  
Teng Yuan ◽  
Yu Yang ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Double Network ◽  
Hydrogel Scaffolds ◽  
3D Printed

scholarly journals Characterization of polyvinyl alcohol-borax/agarose (PVA-B/AG) double network hydrogel utilized for the cleaning of works of art

2020 ◽  
Author(s):  
Ehab Awad Al-Emam ◽  
Hilde Soenen ◽  
Joost Caen ◽  
Koen Janssens
Keyword(s):  
Polyvinyl Alcohol ◽  
Self Healing ◽  
Retention Capacity ◽  
Structured Surfaces ◽  
Double Network ◽  
Liquid Retention ◽  
Long Time ◽  
Cleaning Procedures ◽  
Phase Retention

Abstract Since cleaning of artworks may cause undesirable physicochemical alterations and is a nonreversible procedure, it is mandatory to adopt the proper cleaning procedure. Such a procedure should remove undesired materials whilst preserving the original surface. In this regard, numerous gels have been developed and exploited for the cleaning of various artwork surfaces. Lately, agarose (AG) and polyvinyl alcohol-borax (PVA-B) hydrogels have been widely employed as cleaning tools by conservators. Both hydrogels show some limitations in specific cleaning practices. In this work, we investigated the influence of including increased levels of agarose into PVA-B systems. For this reason, we performed a detailed characterization on the double network (DN) hydrogel including the chemical structure, the liquid phase retention, the rheological behavior, and the self-healing behavior of various PVA-B/AG double network hydrogels. These new hydrogels revealed better properties than PVA-B hydrogels and obviated their limitations. The inclusion of AG into PVA-B systems enhanced the liquid retention capacity, shape-stability, and mechanical strength of the blend. Furthermore, AG minimized the expelling/syneresis issue that occurs when loading PVA-B systems with low polarity solvents or chelating agents. The resultant double network hydrogel exhibits relevant self-healing properties. The PVA-B/AG double network is a new and useful cleaning tool that can be added to the conservators’ tool-kit. It is ideal for cleaning procedures dealing with porous and complex structured surfaces, vertical surfaces and for long time applications.

scholarly journals 3D Printed Silicone Meniscus Implants: Influence of the 3D Printing Process on Properties of Silicone Implants

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2136
Author(s):  
Eric Luis ◽  
Houwen Matthew Pan ◽  
Anil Kumar Bastola ◽  
Ram Bajpai ◽  
Swee Leong Sing ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Weight Bearing ◽  
Thermo Gravimetric Analysis ◽  
Silicone Implants ◽  
Osteoarthritis Of The Knee ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Hydrogel Scaffolds ◽  
Custom Made ◽  
3D Printed

Osteoarthritis of the knee with meniscal pathologies is a severe meniscal pathology suffered by the aging population worldwide. However, conventional meniscal substitutes are not 3D-printable and lack the customizability of 3D printed implants and are not mechanically robust enough for human implantation. Similarly, 3D printed hydrogel scaffolds suffer from drawbacks of being mechanically weak and as a result patients are unable to execute immediate post-surgical weight-bearing ambulation and rehabilitation. To solve this problem, we have developed a 3D silicone meniscus implant which is (1) cytocompatible, (2) resistant to cyclic loading and mechanically similar to native meniscus, and (3) directly 3D printable. The main focus of this study is to determine whether the purity, composition, structure, dimensions and mechanical properties of silicone implants are affected by the use of a custom-made in-house 3D-printer. We have used the phosphate buffer saline (PBS) absorption test, Fourier transform infrared (FTIR) spectroscopy, surface profilometry, thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) to effectively assess and compare material properties between molded and 3D printed silicone samples.

scholarly journals Control of Nanoparticle Release Kinetics from 3D Printed Hydrogel Scaffolds

2017 ◽  
Vol 56 (16) ◽  
pp. 4623-4628 ◽  
Author(s):  
Bernhard Baumann ◽  
Tomasz Jungst ◽  
Simone Stichler ◽  
Susanne Feineis ◽  
Oliver Wiltschka ◽  
...  
Keyword(s):  
Release Kinetics ◽  
Hydrogel Scaffolds ◽  
3D Printed ◽  
Nanoparticle Release

HBC-nanofiber hydrogel scaffolds with 3D printed internal microchannels for enhanced cartilage differentiation

2020 ◽  
Vol 8 (28) ◽  
pp. 6115-6127
Author(s):  
Xiaoyun Liu ◽  
Shaoshuai Song ◽  
Jie Huang ◽  
Han Fu ◽  
Xinyu Ning ◽  
...  
Keyword(s):  
Hydrogel Scaffolds ◽  
Cartilage Differentiation ◽  
3D Printed

HBC-nanofiber hydrogel scaffolds with 3D printed internal microchannels have been developed to provide a multifunctional biomimetic microenvironment for hMSC chondrogenesis.

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