The Experts below are selected from a list of 48765 Experts worldwide ranked by ideXlab platform
Abbas Khaksar Manshad - One of the best experts on this subject based on the ideXlab platform.
-
characterization and likelihood application of extracted mucilage from hollyhocks plant as a Natural Polymer in enhanced oil recovery process by alkali surfactant Polymer asp slug injection into sandstone oil reservoirs
Journal of Molecular Liquids, 2020Co-Authors: Iman Nowrouzi, Amir H Mohammadi, Abbas Khaksar ManshadAbstract:Abstract Injection of water-based Polymeric solutions into oil reservoirs is a common way to enhance oil recovery in the tertiary oil production stage. Polymers are normally injected under different scenarios individually, or with surfactants and alkalis, or both as a slug. Adjusting the ratio of water and oil mobility, preventing the phenomenon of fingering and early production of injectable water by increasing water viscosity are the most important mechanisms of Polymer injection in enhanced oil recovery (EOR) process. In this study, the possibility of using extracted mucilage from Hollyhocks plant as a Natural Polymer for injection as a slug with surfactant and alkaline in sandstone reservoirs was investigated. The plant Polymer was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Energy Dispersive X-ray Analysis (EDAX) and Thermal Gravimetric Analysis (TGA) after extraction and preparation. Viscosity tests were performed at different shear rates and the effects of Polymer concentration, Polymer hydration time, temperature and salinity on the viscosity of the Polymeric solutions were investigated. Finally, a Polymeric slug containing the Polymer, an anionic surfactant at the critical concentration of micelle (CMC) and NaOH alkali at the optimum concentration was injected into a sandstone plug to calculate the oil recovery rate by the Alkali-Surfactant-Polymer (ASP) slug injection process. The novelty of this research is the introduction and use of a new, affordable and inexpensive Polymer for use in ASP-slug injection into sandstone reservoirs, which can solve many of the challenges in this method. Based on the results, TGA analysis confirms the stability of the Polymer at reservoir temperatures. Decreased viscosity versus increased shear rate shows non-Newtonian behavior of the Polymeric solutions. The viscosity values of the Polymeric solutions are several tens of times more than the surfactant solutions viscosities even at the low concentrations. Therefore, the Polymer can be considered suitable for use in the ASP-slug injection process. The viscosity of Polymeric solutions decreases with increasing temperature and salinity. However, the final values are not low enough to counteract the Polymer effect. Finally, an increase in oil recovery of 27.9% is achieved under the ASP slug injection process containing an anionic surfactant synthesized from waste chicken fat at CMC, NaOH alkali at 2500 ppm and the Polymer extracted from Hollyhocks at 2000 ppm. At last, it should be mentioned that the main purpose of this study was to introduce a new Polymer for EOR process by injecting ASP slug. However, its application does not lead to this only. Polymers are used in various oil and gas industries. Due to the properties and behavior of the Polymer solution, it can be used to reduce water production from oil reservoirs, improve the properties of drilling fluids and inject it with other additives to increase oil recovery.
Zhongxu Dai - One of the best experts on this subject based on the ideXlab platform.
-
synthesis of graphene quantum dots from Natural Polymer starch for cell imaging
Green Chemistry, 2018Co-Authors: Weifeng Chen, Li Tian, Wei Xiang, Tianyuan Wang, Shaona Chen, Jianfeng Chen, Zhongxu DaiAbstract:We developed a facile and effective route to synthesize GQDs for bioimaging by using starch as a precursor. The reactants consist of only starch and water. Furthermore, the products are only GQDs, water, and carbide precipitate. Thus, the complicated post-processing steps are avoided. The present work is the first report of the synthesis of GQDs from a high molecular weight Polymer.
Tae-il Son - One of the best experts on this subject based on the ideXlab platform.
-
Photo-reactive Natural Polymer derivatives for medical application
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Eun-hye Kim, Yoshihiro Ito, Ga-dug Han, Seung-hyun Noh, Jae-won Kim, Jae-gwan Lee, Tae-il SonAbstract:Abstract Biomaterials should be biocompatible and biodegradable. Many researches had been studied to upgrade biomaterials to deliver various types of drugs. In this respect, Natural Polymers have been catching on as a biomaterial. To immobilize drugs using Natural Polymer, photo-immobilization method has been designed. This method has several advantages. For photo-immobilization, photo-reactive functional group should be introduced to Natural Polymer. According to purpose of application, you could choice one of the photo-reactive functional group. Finally, many types of chemically modified Natural Polymers, which are photo-reactive Natural Polymer derivatives, have been prepared and studied to apply in medical field.
Wanli Chu - One of the best experts on this subject based on the ideXlab platform.
-
Natural Polymer-based Stimuli-responsive Hydrogels.
Current medicinal chemistry, 2020Co-Authors: Yuheng Jiang, Ying Wang, Wanli ChuAbstract:The abilities of intelligent Polymer hydrogels to change their structure and volume phase in response to external stimuli have provided new possibilities for various advanced technologies and great research and application potentials in the medical field. The Natural Polymer-based hydrogels have the advantages of environment-friendliness, rich sources and good biocompatibility. Based on their responsiveness to external stimuli, the Natural Polymer-based hydrogels can be classified into the temperature-responsive hydrogel, pH-responsive hydrogel, light-responsive hydrogel, electricresponsive hydrogel, redox-responsive hydrogel, enzyme-responsive hydrogel, magnetic-responsive hydrogel, multi-responsive hydrogel, etc. In this review, we have compiled some recent studies on Natural Polymer-based stimuli-responsive hydrogels, especially the hydrogels prepared from polysaccharides. The preparation methods, properties and applications of these hydrogels in the medical field are highlighted.
Mohammad Zuber - One of the best experts on this subject based on the ideXlab platform.
-
A review on synthesis, properties and applications of Natural Polymer based carrageenan blends and composites
International Journal of Biological Macromolecules, 2017Co-Authors: Khalid Mahmood Zia, Muhammad Nasif, Nosheen Aslam, Aqdas Noreen, Shazia Tabasum, Neelam Sultan, Mohammad ZuberAbstract:Carrageenan is a Natural polysaccharide extracted from edible red seaweeds of Rhodophycea class. It has been used as a viscosity increasing or gelling agent for prolonged and controlled drug release, food, pharmaceuticals and other industries. However, in spite of wide range of applications, carrageenan has some drawbacks and adverse effects on the biological systems, so its modifications with Natural and synthetic Polymers are carried out. This review article presents different sources and properties of carrageenans with special emphasis on Natural Polymer based carrageenan blends and composites and their applications in controlled drug delivery system, wound dressing and tissue engineering because of their biodegradability and biocompatibility, food industry as thickening/gelling materials, cosmeceuticals and making polyelectrolyte complexes.
