List of Articles
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Open Access Article
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Amirhosein Yazdanbakhsh -
Open Access Article
2 - review of polymer-protein
Nadereh Golshan Ebrahimi -
Open Access Article
3 - Polymer Networks as Hierarchical Porous Carbon Materials: Synthesize, Properties and Applications
ziba shirini kordabadi Fatemeh RafiemanzelatPorous materials have different types of pores in the micro, meso or nano range, each of which plays a special role in porous materials application. Among these materials, porous carbon materials have a special share due to their unique properties such as: mechanical, c MorePorous materials have different types of pores in the micro, meso or nano range, each of which plays a special role in porous materials application. Among these materials, porous carbon materials have a special share due to their unique properties such as: mechanical, chemical and thermal stability and their reasonable price. There are two main methods for synthesizing porous carbon materials: 1) template method and 2) pyrolysis/activation method. The template method is basically time consuming and tedious due to the use of the template and removal of template. Thus the method of pyrolysis/activation is widely used to prepare porous carbon materials from porous polymer precursers or waste and biomass materials in the presence of the physical and chemical active agents. Replacement of heteroatoms including: N, O, B, S and P in carbon materials leads to increased efficiency and development of their new applications; For example, the use of porous N-doped carbon materials as electrodes in superconducting cells increases the efficiency of energy storage and in the field of adsorbents materials increases the efficiency of CO2 uptake. Due to their unique properties, especially high surface area, low weight and high adsorption capacity, porous carbon materials are used in hydrogen storage, contaminants removal fron air air water, electrodes and as catalyst support. Manuscript profile -
Open Access Article
4 - Mini-Review of Self-Healing Mechanism and Formulation Optimization of Polyurea Coating
Moein Behzadpour Mahdi Hemmatian DamghaniSelf-healing polymers are categorized as smart materials that are capable of surface protection and prevention of structural failure. Polyurethane/polyurea, as one of the representative coatings, has also attracted attention for industrial applications. Compared with po MoreSelf-healing polymers are categorized as smart materials that are capable of surface protection and prevention of structural failure. Polyurethane/polyurea, as one of the representative coatings, has also attracted attention for industrial applications. Compared with polyurethane, polyurea coating, with a similar formation process, provides higher tensile strength and requires shorter curing time. The working principle of polyurea self-healing mechanisms is to fill cracks by introducing more healing components, which can polymerize and seal damage in the material. Alternatively, it can also be addressed by encouraging continuous chemical reactions, which can form bonds to close gaps between the separated faces of material due to the damage. In this paper, extrinsic and intrinsic mechanisms are reviewed to address the efficiency of the self-healing process. Furthermore, the extrinsic and intrinsic mechanisms have been compared to attain a better understanding of the advantages and limitations of each mechanism. Moreover, formulation optimization and strategic improvement to ensure self-healing within a shorter period of time with acceptable recovery of mechanical strength are also discussed. The choice and ratio of diisocyanates, as well as the choice of chain extender, are believed to have a crucial effect on the acceleration of the self-healing process and enhance self-healing efficiency during the preparation of polyurea coatings. Manuscript profile -
Open Access Article
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HamidReza Sabbaghi Ali Abbasian -
Open Access Article
6 - Graphene‑based composite membranes for nanofiltration: performances and future perspectives
Farzad MehrjoNanofiltration is one of the most widely used membrane processes for water purification with high practical value because of a large number of chemical species that are separated through this process. Usually, for nanofiltration, high energy–con- suming operations are i MoreNanofiltration is one of the most widely used membrane processes for water purification with high practical value because of a large number of chemical species that are separated through this process. Usually, for nanofiltration, high energy–con- suming operations are involved including the generation of enough pressure for the rejection of jumps and lower molecular weight chemicals at the surface of the membrane. Recent developments in the synthesis of nanocomposite membranes with graphene and graphene derivatives have led to an increase in energy requirements and the increase in membranes perfor- mances. In the present review, we have presented the recent advances in the field of graphene-based composite membranes for nanofiltration with applications for both types of based solvents—aqueous solutions and organic solvents. The presentation will be focused especially on the performances of membranes and applications of these materials for the rejection of salts (Na+, Mg2+), heavy metals (Li2+), and lower molecular weight organic compounds (methylene blue, Congo red, Direct Red, Methyl orange, Reactive green 13, etc.). Modern synthesis methods like interfacial polymerization for obtaining thin-film composite nanofiltration membranes are also presented. Nanofiltration is one of the most widely used membrane processes for water purification with high practical value because of a large number of chemical species that are separated through this process. Manuscript profile