2024-03-29T16:22:25Z
https://www.jourtm.com/?_action=export&rf=summon&issue=16805
Journal of Tissues and Materials
JTM
2645-3487
2645-3487
2020
3
4
The effect of synthesis parameters on structure and properties of silica xerogels
elmira
banaee mofakham
azadeh
ghaee
arezou
mashak
IntroductionSol gel derived silica matrices have many promising features such as high homogeneity, product purity, chemical and physical stability and porosity. These porous materials with nanosized pores enable loading of numerous biologically active substances into matrices. ObjectiveThe aim of this study was to investigate the effect of synthesis parameters on structure of silica xerogels. MethodsThe effect of two different catalysts (NH4OH and HCl), drying temperature and water content on properties of xerogels were studied. Chemical composition and structure of xerogels were analyzed by Fourier Transfer Infrared Radiation (FTIR) and Scanning Electron Microscopy (SEM), respectively. Specific surface area and pore size of xerogels were examined by BET. ResultsFTIR results confirmed the forming of Si-O-Si bonds which proved condensation of silanols. According to results, acid-base catalyst, lower temperature for drying and lower water content caused to form crack free xerogels. SEM results showed that acid-base catalyzed xerogels were more porous and pores of acid-base catalyzed xerogels were cylindrical while acid catalyzed xerogels had plate like pores. BET results represented that using higher drying temperature, higher water content and acid-base catalyst increased pore size of xerogel. Also BET results proved that these xerogels had nanosized pores( ̴ 4nm).ConclusionWe conclude that different active substances can be entrapped in xerogels by changing synthesis parameters and achieving different pore sizes.
Silica
Xerogel
Sol gel
Catalyst
drying temperature
2020
12
01
1
5
https://www.jourtm.com/article_122545_9adde802cb64a9d127698b0115a636da.pdf
Journal of Tissues and Materials
JTM
2645-3487
2645-3487
2020
3
4
An Overview of Polyaniline in Tissue Engineering
Bahareh
Kheilnezhad
Alireza
Safaei Firoozabady
Amir
Aidun
Electrical response in tissue regeneration has been demonstrate, so growing use of conductive polymers as a main component of scaffolds have developed. Advantages of Polyaniline outweigh other conductive polymers, these including, cost-effective, easy to fabrication, more biocompatible than others, etc. On other hand, cell signaling has been proved as dynamic biochemical that could be promoted cell behaviors such as adhesion, proliferation, and differentiation. In addition, oligoaniline has been emerged to solve some limitation of polyaniline such as biodegradability and biocompatibility problems. Recent researches have been shown that all cells such as cardiac, neural, muscle, bone and fibroblast cells respond to electrical stimulation and to enhance their functions. Bio-mimicking scaffolds is a key role in tissue engineering to achieve a target goal. Hence, the use of polyaniline/oligoaniline has increased. In this review, we investigated properties of polyaniline/oligoaniline and its applications in a variety of tissue engineering.
Polyaniline
Oligoaniline
Tissue engineering applications
Regenerative medicine
2020
10
01
6
22
https://www.jourtm.com/article_142186_ee9660b04c92cdf58fdda8824b9c6d0b.pdf
Journal of Tissues and Materials
JTM
2645-3487
2645-3487
2020
3
4
Three-Dimensional Bioprinting in the neural system
2020
12
01