2024-03-29T19:05:07Z
https://www.jourtm.com/?_action=export&rf=summon&issue=15053
Journal of Tissues and Materials
JTM
2645-3487
2645-3487
2020
3
2
Synthesis polyurethane closed cell foam via chemical method
Mohammad Reza
Gharabeik
Hassan
Nosrati
Amir Hossein
Ahmadi
Introduction: Possibly the most important class of polymeric foams are polyurethane foams (PUFs), as their thermal conductivity and low density combined with their interesting mechanical properties make them excellent thermal and sound insulators, as well as structural and comfort materials. Objective: In this study, we demonstrate synthesis polyurethane closed cell foam via a simple chemical method. Material and Methods: The chemicals used in the study included polyol, foaming agent, silicon oil, and other additives. Characterization methods included X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), elemental map, and Fourier transform infrared spectroscopy (FTIR). Result: The results of the analysis showed that the obtained foams were successfully synthesized. The cells in these foams were mostly closed, and were micrometric in size. Trace elements were homogeneously distributed in synthesized foams. Conclusion: The results of this study are expected to be useful for the engineering application of this type of foam.
Polyurethane
Closed cell foam
Chemical Method
Synthesis
2020
06
01
Journal of Tissues and Materials
JTM
2645-3487
2645-3487
2020
3
2
Preparation and characterization of SiC/SiO2 coating by a sol–gel method
Mohammad Reza
Gharabeik
Hassan
Nosrati
Amir Hossein
Ahmadi
Introduction: There are different methods of coating. Depending on the benefits and limitations of each, one method will be optimal. Objective: The aim of this study is to synthesis SiC-SiO2 coatings with different percentages of SiO2 and SiC. Material and Methods: By changing the parameters affecting the sol, the percentage of SiO2 and SiC in the coating is adjusted to optimize the mechanical properties such as hardness and wear resistance. The morphology of the coating is examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Result: Suspensions prepared in an acidic environment are rapidly agglomerated and practically cannot be coated. Suspensions prepared in a neutral environment also settle after a very short time. However, the suspensions and colloids prepared in the alkaline environment have a relatively high stability. Therefore, it can be conclude that pH is the main variable of coating process. Conclusion: The results of this study are expected to be useful for the engineering application of this type of coating.
SiC/SiO2
Sol–Gel
coating
Synthesis
2020
06
01
Journal of Tissues and Materials
JTM
2645-3487
2645-3487
2020
3
2
3D bioprinting for bone tissues: materials and design
2020
06
01
Journal of Tissues and Materials
JTM
2645-3487
2645-3487
2020
3
2
Fabricating Polyethylene oxide (PEO) Nanofiber Scaffolds with Different Molecular Weight for Viral Infection Diseases
Elnaz
Ahani
Masumeh
Dodel
Recently, a novel dosage form topical vaginal delivery has been developed utilizing drug-fibers fabricated by electrospinning. Biocompatible and biodegradable nanofiber meshes suitable for drug delivery systems were electrospun based on poly (ethylene oxide) (PEO) with high molecular weight (HMW) and low molecular weight (LMW) to design innovative vaginal delivery systems. It is desirable to encapsulate a drug inside the fibers to enhance the drug antiviral activity in addition to controlling the fiber diameter. The surface morphology and average diameter of the nanofibers were determined by field emission scanning electron microscopy (FE-SEM). Based on SEM results it was revealed that the HMW PEO has more uniform nanofibers with good average diameters than LMW PEO. We formulated acyclovir (ACV) at 20 wt% into electrospun solid dispersions construct from PEO nanofibers and examined distribution in characterizing drug release rates into aqueous media. We assumed that ACV-loaded PEO nanofiber scaffolds were prepared using electrospinning when applied to vaginal environment, should remain undamaged as long as the environment is acidic.
Nanofibers
Scaffolds
Electrospinning
Poly (ethylene oxide)
high molecular weight (HMW)
low molecular weight (LMW)
Acyclovir (ACV)
2020
06
01