List of Articles
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Open Access Article
1 - Investigation of Blood Coagulation Process on Biopolymers and Review on the Hemocompatibility Evaluation Methods
Rahim Dehghan Jalal Barzin Seyed Hossein Abtahian Behnam Darabi Hamidreza GhaderiThe use of biopolymers in the development of biomedical devices has extended in recent years. These devices are including prosthetic heart valves catheter, cardiovascular stents, artificial arteries, peacemakers, hemodialysis membranes, etc. Hemocompatibility is taken i MoreThe use of biopolymers in the development of biomedical devices has extended in recent years. These devices are including prosthetic heart valves catheter, cardiovascular stents, artificial arteries, peacemakers, hemodialysis membranes, etc. Hemocompatibility is taken into account as one of the essential cases of biopolymers for biomedical applications. Knowing biopolymer-blood interaction is very considerable for the development of a hemocompatible biopolymer. Various factors can undergo the hemocompatibility of biopolymers. Surface properties such as hydrophilicity, surface energy, and electrostatic charge are the most important factor for the control of hemocompatibility. In this study, further blood coagulation mechanism on the biopolymers, evaluation methods of hemocompatibility is investigated. Methods include protein adsorption which is the first phenomenon of the blood coagulation process, investigation of kallikrein activity which evaluates intrinsic coagulation pathway, assessment of coagulation times such as thrombin time (TT), prothrombin time (PT) and activated partial thromboplastin time (APTT) which monitor extrinsic, intrinsic and common pathway of blood coagulation, hemolysis of erythrocytes, microscopy analysis of cell adhesion, platelet adhesion and activation. Change in platelet morphology is one of the main criteria for the investigation of blood compatibility. Finally, a hemocompatible polymer should pass all mentioned blood compatibility analyses. Herein, besides i Manuscript profile -
Open Access Article
2 - a review of the investigation methods and performance of pure polymer gears
Rasool Molhsenzadeh ehsan nozad bonabPlastic gears are widely used in various industries. The advantages of these gears include their lightness, automation, low noise, easy production and low cost. However, the high wear rate, limited working temperature and low mechanical strength in polymer gears, compar MorePlastic gears are widely used in various industries. The advantages of these gears include their lightness, automation, low noise, easy production and low cost. However, the high wear rate, limited working temperature and low mechanical strength in polymer gears, compared to metal types, limit their application. Therefore, extensive research has been done on the performance of polymer gears in order to identify the failure mechanisms. Among the conducted researches, the researchers focus on different parts such as determining the critical torque or in other words, load bearing capacity, gear behavior at lower and higher torques than the critical torque, gear fatigue resistance, gear wear behavior on a micro and macro scale, as well as The thermal resistance of the gear is drawn. In addition, the difference in methods and the provision of new methods for checking the mentioned factors in order to check the performance of the gear can be seen in the research. In general, the type of polymer, torque and work cycle have been recognized as factors influencing the wear of polymer gears. In this research, the method and results of the research conducted on various types of gears made with commonly used polymer materials are presented. In such a way that by comparing the performance of all types of gears, it is possible to reach a general conclusion about their use. Manuscript profile -
Open Access Article
3 - Polymer composites containing sheep wool fibers using thermal and sound insulation: from introduction to application
Mohsen SadroddiniAs a natural and environmentally friendly fiber, sheep wool has an extraordinary place among all textile fibers due to its unique properties such as high thermal insulation properties, good sound insulation and absorption, self-extinguishing, high flame resistance, low MoreAs a natural and environmentally friendly fiber, sheep wool has an extraordinary place among all textile fibers due to its unique properties such as high thermal insulation properties, good sound insulation and absorption, self-extinguishing, high flame resistance, low weight and high strength. Sheep wool fibers are traditionally used in clothing and textiles, but they can be used in various applications. One of the vital industrial applications of sheep wool fibers is to employ them as reinforcing fillers in polymer composites using thermal insulation and sound and acoustic absorbers. This review paper aims to introduce sheep wool fiber and present it as a high-performance fiber (HPF) in the role of a natural and low-cost alternative to synthetic polymer fibers. In this regard, an attempt has been made to conduct a comprehensive review of polymer-sheep wool composites as thermal insulation and sound absorber. Manuscript profile -
Open Access Article
4 - A review of polymer 3D printing technology: materials, process and design strategies for medical applications
amir hasnvandچكيده انگليسي Polymer 3D printing is an emerging technology that further research in this field will lead to continuous improvement of polymer 3D printing design performance, which is necessary to push the boundaries in engineering and medicine. Polymer 3D printing pr Moreچكيده انگليسي Polymer 3D printing is an emerging technology that further research in this field will lead to continuous improvement of polymer 3D printing design performance, which is necessary to push the boundaries in engineering and medicine. Polymer 3D printing provides the possibility of printing low-cost functional parts with various properties and capabilities. Here, by reviewing research on materials, processes and related strategies applied for medical applications, it is presented. Research in materials has led to the development of polymers with useful properties for mechanics and biocompatibility, by tuning the mechanical properties achieved by changing the parameters of the printing process. Polymer 3D printing technologies include extrusion, sheet lamination, Vat photo polymerization, additive layer, powder-based fusion, material projection, direct energy deposition. Thermal and laser inkjet techniques are more common. The two technologies of sheet exfoliation and direct energy deposition have limited medical applications. Which enables the direct deposition of design materials for useful and customized architectures. Design strategies, such as the hierarchical distribution of materials, make it possible to balance contrasting properties. The most investigated medical applications include tissue scaffolds, dental implants, medical education, delivery systems, and drug safety devices. And finally, the challenges and obstacles of polymer 3D printing were studied. Manuscript profile -
Open Access Article
5 - A review of the sorbents based on covalent organic frameworks containing hybrids for extraction methods
Mohammad Javad Aghajani Milad Ghani Jahan Bakhsh RaoofCovalent organic frameworks have been used as a group of porous organic frameworks due to their remarkable intrinsic properties, such as high specific surface area and variable pore size as well as high stability. Also, they are flexible that by producing functional cov MoreCovalent organic frameworks have been used as a group of porous organic frameworks due to their remarkable intrinsic properties, such as high specific surface area and variable pore size as well as high stability. Also, they are flexible that by producing functional covalent organic frameworks or polystructures based on them, major changes in their physical and chemical properties can be made. In this article, several important groups of covalent organic frameworks are examined in terms of their design and manufacturing methods. Also, synergism of covalent organic frameworks with other materials, such as different types of magnetic nanoparticles, metal/metal oxide, silica, carbon nanomaterials, polymers, polyoxometalates and metal-organic frameworks are studied. Finally, recent applications of covalent organic frameworks as efficient adsorbents in sample preparation methods such as solid phase extraction, diffusion solid phase extraction, magnetic solid phase extraction and fibrous solid phase microextraction with emphasis on important factors that lead to increased efficiency It will be extracted and will be checked. Investigations have shown that hybrid formation of organic-covalent frameworks and other compounds, including polymers, can be effective in improving the performance of these compounds. It is important to note that an essential step during the synthesis of covalent organic frameworks is their design concept. The purpose of design is the specific orientation of covalent bonds between the functional groups of constituents (node and linker), types of bonds and types of topologies with pore sizes that require engineering. In addition, the challenges in these approaches will also be discussed. Manuscript profile -
Open Access Article
6 - Mechanisms and promising applications of mussel-inspired hydrogels
AKBAR MIRZAEI shahrzad javanshir ghalzaleh MIRZAEImussel-inspired chemistry has become a powerful tool for the rational design and synthesis of hydrogels with modified properties and applications due to their unique functionalities. Hydrogels are cross-linked three-dimensional polymer networks with high water content a Moremussel-inspired chemistry has become a powerful tool for the rational design and synthesis of hydrogels with modified properties and applications due to their unique functionalities. Hydrogels are cross-linked three-dimensional polymer networks with high water content and flexible structure, and due to their mechanical and chemical similarities with biological tissues, as well as the existence of mechanical and electrical properties, they are used in various fields of medical engineering, soft robotics, Electronics and environmental science have many applications. Despite the extensive progress in this field, conventional hydrogels still face many problems, such as the lack of general strategies to program the chemical/physical properties and the difficulty in meeting some specific application requirements, especially in the diverse and complex working environment that limit their application. severely restricts. Therefore, the modification of hydrogels according to different purposes can lead to their more and better use in various industries. Adhesive hydrogels are gaining interest for biomedical applications due to their high adhesion, tunable structure, high water content, and biocompatibility. Meanwhile, the modification of normal hydrogels with the help of oyster-inspired chemistry, such as the use of dopamine and tannic acid, can give unique properties to the gels and their application in many fields, including biomedical engineering, electronics, stimuli and sensors. Wider wearable. Our aim in this review article is to investigate the hydrogel made with the help of mussel-inspired compounds. Manuscript profile