فهرست مطالب قاسم پیام

Starch and its derivatives have proven their usefulness in flocculation processes. Among these derivatives, cationic starch has been widely used in the water treatment industry as a suspending agent and surface absorption processes. Cationic starch is synthesized by adding chemical materials with certain cationic groups to natural starch. Cationic starches have long been used as additives in papermaking to improve mechanical strength and provide better and faster shelf-life properties. This review briefly discusses the recent studies on the synthesis, structure and mechanism of surface adsorption in cationic starch flocculants. The most important use of flocculants is in water purification. Water treatment facilities use coagulants to neutralize charged particles suspended in water. This study also describes conventional synthetic processes and cation substitutions of cationic starches and addresses their current and potential applications in flocculation. In addition, the effect of structural and operational parameters on the mechanism and extent of cationic starch surface absorption has been investigated, especially in the case of microorganisms. All the mentioned studies have been investigated with the aim of expressing the high ability of cationic starches in the direction of flocculation and wastewater treatment with efficient and cost-effective performance.

In recent times, there has been significant interest in the field of biomedical applications, particularly in the realm of targeted drug delivery and medical implants, where injectable biomaterials possessing 3D printing capabilities have garnered considerable attention. While numerous biomaterials have been developed to replicate the mechanical behavior of human tissue, the quest for an ideal biocompatible material with adjustable mechanical properties that can accommodate a wide range of characteristics remains unfulfilled. Within the scope of this research, a printable and injectable elastomeric hydrogel was formulated utilizing polyurethane as the elastomer component and hydroxyethyl methacrylate as the hydrogel component. By varying the percentage composition of these constituents, a diverse array of mechanical properties was achieved. Fourier Transform Infrared Spectroscopy was employed to verify the successful synthesis of EPUH. The synthetic materials displayed modifiable mechanical properties in their dry states, encompassing a range of Young's modulus values from 20 MPa to 1.2 GPa, as well as elongation at break values ranging from 20% to 140%. Additionally, this study also encompassed an evaluation of water uptake and printability of the samples.