Article
Polymer Science
Zhonglan Cui, Yan Zhang, Chenkai Zhu, Lixiang Song, Jicheng Wang, Qianhong Jin, Qunchao Su, Dongming Qi
Summary: This study investigated the change process of the orientation morphology of functional fillers in polymer composites and its impact on performance. It was found that the composite fibers achieved tight arrangement and high orientation at a high melting temperature, with no effect on the rheological type from the addition of nano SiO2 particles. The shear stress increased significantly, and the elongation at break also improved.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Rahul Shankar, Lisa K. Kemp, Nicholas A. Smith, Jacob A. Cross, Beibei Chen, Sergei I. Nazarenko, Jin Gyu Park, Travis L. Thornell, John K. Newman, Sarah E. Morgan
Summary: This study investigates the application of POSS in high-performance polymers, revealing that TSP-POSS offers better enhancement of processability and reduction of viscosity compared to DP-POSS, with a more uniform nanoscale dispersion.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Biyou Peng, Jiawen Li, Jintian Wu, Ning Chen, Gang Chen
Summary: In this study, composite scaffolds with different pore structures were successfully fabricated using FDM technology and characterized using SEM and dynamic thermomechanical analyzer. The introduction of PLA and HA increased the modulus of the material, enhancing its FDM processing. Biocompatibility and mineralization ability of the scaffolds were investigated, showing good bone formation and mineralization ability with reduced concentrations of Ca2+ and PO4(3-) in simulated body fluid over time. Biotoxicity test confirmed excellent biocompatibility of the scaffold.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Souheyla Chami, Nicolas Joly, Patrizia Bocchetta, Patrick Martin, Djamel Aliouche
Summary: The study explores the possibilities of using xanthan-g-polyacrylamide for polymer flooding in a medium salinity Devonian oilfield. The grafted copolymer shows improved rheological performance and stability in steady shear and oscillatory flow experiments, indicating better salt sensitivity and temperature sensitivity control compared to xanthan.
Article
Polymer Science
Pengcheng Li, Dawei Yan, Lin Luo, Wanli Tang, Haohao Ren, Yonggang Yan
Summary: PENAPs copolymers were synthesized with excellent mechanical properties, good solubility, and processability, as well as notable thermal stability and flowability.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Engineering, Chemical
Ramona Huelsmann, Wiebke Wiggers, Guenter J. Esper, Reinhard Kohlus
Summary: The investigation of single droplets in the acoustic levitator has been increasingly used to study their behavior during drying. By controlling the environment and using cameras, accurate calculations of drying kinetics and parameters can be made. The drying behavior of solutions at different concentrations and temperatures were examined, leading to conclusions about the final particle structure and solution viscosity.
Article
Polymer Science
Wei Lu, Huilin Zhang, Guansheng Qi, Xiangming Hu, Lulu Sun, Hao Su, Qian Zhang
Summary: In this paper, a new kind of environmental friendly double-network gel material was prepared by graft copolymerization and chelation reaction. The gel has a stable three-dimensional network structure and exhibits excellent water absorption, plugging, and fire extinguishing capabilities.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Jorne Driezen, Axel S. Herrmann
Summary: This study investigates the crystallization behavior of high-performance thermoplastics and proposes an effective method to predict key process parameters in polymer processing. By simulating the thermal history of the materials, optimal process parameters can be assigned at specific time points, improving the processing and material properties while avoiding trial-and-error experimentation or post-processing.
Article
Chemistry, Applied
Xiaowan Zhao, Yun Zhou, Zhen Wu, Jia Chen, Fang Zhou, Guohua Zhao
Summary: The interaction between different degrees of esterified high-methoxyl pectin (HMP) and Ca2+ was studied. The results showed that Ca2+ promoted the aggregation of HMP molecules, significantly increased the viscosity and thixotropy, and changed the shear-thinning behavior. These findings are expected to promote the application of HMP in acid-and sugar-restricted food products.
FOOD HYDROCOLLOIDS
(2023)
Article
Polymer Science
Natanel Jarach, Hanna Dodiuk, Samuel Kenig, Naum Naveh
Summary: The effect of chemical composition on the rheology of reversible covalent bond containing polyethyleneimine was investigated. It was found that adding triethylenetetramine can reduce the viscosity, and the transformation of bonds at different temperatures affects the dynamic behavior of the material.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Petr Filip, Jana Zelenkova, Petra Peer
Summary: A new method for evaluating the initial polymer concentration required for the production of beadless nanofibres during electrospinning process is proposed in this study. This approach avoids the use of traditional concepts of overlap and entanglement concentrations, aiming to address the issue of inability to apply classical methods in specific material cases.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Physical
Yuyin Xi, Ryan P. Murphy, Qingteng Zhang, Aurora Zemborain, Suresh Narayanan, Junsu Chae, Siyoung Q. Choi, Andrei Fluerasu, Lutz Wiegart, Yun Liu
Summary: Bicontinuous structures have broad applications in various research fields. A new gel called SeedGel has been developed to create reversible bicontinuous channels with tunable particle sizes. The mechanical properties of SeedGel were characterized using temperature-dependent rheology, showing excellent reproducibility and an interesting temperature dependence. The gelation transition and solvent exchange between domains were studied using SANS measurements, while the long-time dynamics of the gel were studied with X-ray Photon Correlation Spectroscopy (XPCS).
Article
Polymer Science
Vincenzo Calabrese, Simon J. Haward, Amy Q. Shen
Summary: Cellulose nanocrystals (CNC) act as model colloidal rods in the formation of soft materials with tailored anisotropy. Experimental quantification using microfluidic devices shows that the deformation rate required for CNC alignment is 4 times smaller in extension than in shear. A scaling relationship based on a Peclet number allows for the prediction of alignment under purely extensional deformation, providing coherent guidelines for manufacturing structured soft materials.
Article
Polymer Science
Manuela Walteros-Leon, Monica Lucia Alvarez-Lainez
Summary: Natural rubber latex (NRL) is a complex colloidal system that can be concentrated using hydroxyethyl cellulose (HEC) and sodium dodecyl sulphate (SDS), which alter its colloidal and rheological properties. SDS plays a key role in enhancing the creaming process and improving the electrostatic stability of the colloidal system.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Polymer Science
Shilong Wu, Huanhuan Yang, Quan Chen
Summary: Molecular theories for dynamics of entangled polymers are based on the number of Kuhn segments per entanglement and the number of entanglements per chain. Linear viscoelasticity can be properly normalized, but normalization fails in the nonlinear extensional rheological properties. This study identifies a suitable model system with fixed parameters and finds that the degree of transient strain hardening during extensional flow increases with alkyl group size, attributed to weaker friction reduction when the main backbones are more separated.
Article
Engineering, Chemical
Sanaz Ghiasi, Toraj Mohammadi, Maryam Ahmadzadeh Tofighy
Summary: This study focused on the removal of boron from water using hybrid nanofiltration thin film composite hollow fiber membranes. The researchers fabricated nanocomposite PVC HF membranes containing bentonite and LDH nanoparticles as adsorbents, and found that LDH interacts better with PVC polymeric chains and results in more hydrophilic membranes with better performance. The fabricated membranes containing LDH also have lower MWCO and more uniform pore size distribution, making them better options as support for the TFC layer formation to fabricate NF TFC membranes. The NF TFC membranes containing LDH exhibited better performance in boron removal compared to those containing bentonite.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Ali Behboudi, Toraj Mohammadi, Mathias Ulbricht
Summary: This study prepared forward osmosis hollow-fiber membranes with in situ assembly of polyethyleneimine and surface-modified silver nanoparticles. These membranes exhibited excellent separation performance in an osmotic membrane bioreactor and reduced fouling by wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Sanaz Ghiasi, Toraj Mohammadi, Maryam Ahmadzadeh Tofighy
Summary: Hybrid adsorptive nanofiltration membranes with charge-patterned structure were successfully fabricated for enhanced boron removal. The modified UiO-66/PEI TFN membrane showed the highest boron removal efficiency under alkaline pH conditions.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Review
Polymer Science
Elham Valamohammadi, Fatemeh Behdarvand, Toraj Mohammadi, Maryam Ahmadzadeh Tofighy, Zohreh Moghiseh
Summary: Polymeric membranes used in wastewater treatment and desalination show decreased efficiency over time. Polymer nanocomposite membranes (PNMs) with carbon nanotubes (CNTs) can improve permeability and antifouling properties, while also enhancing other physicochemical characteristics.
Article
Chemistry, Multidisciplinary
Fariba Sadat Kamelian, Fereshteh Naeimpoor, Toraj Mohammadi
Summary: This study investigates the efficient fermentation of high glucose and xylose levels via an innovative two-stage fermentation-pervaporation process. The use of immobilized Zymomonas mobilis and Pichia stipitis in a sequential-co-immobilized culture improves bioethanol productivity and reduces inhibitions. The study also fabricates a tubular superhydrophobic silicalite-1/PDMS pervaporative membrane to reduce inhibitions. The results show improved xylose conversion and ethanol productivity, making it a robust integrated process for second-generation bioethanol production.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Soha Habibi, Toraj Mohammadi, Romina HMTShirazi, Fatemeh Atyabi, Melika Kiani, Amir Atabak Asadi
Summary: In this study, double-layer CS/PVA/mupirocin (CPM) + CS/PVA/bupivacaine (CPB) electrospun nanofiber mats were prepared and crosslinked to optimize their water-resistant and biodegradation properties. The mats exhibited defect-free and interconnected nanofibers, providing a moist environment for efficient wound breathing and repairing. The highly porous mat absorbed wound exudates and allowed air permeability, reducing the chance of bacterial infections.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Multidisciplinary
Zahra Rezaee, Toraj Mohammadi, Omid Bakhtiari
Summary: In this study, nanocomposite membranes with uniform dispersion of amorphous PANI nanofibers were prepared using different concentrations of Pebax 1657 and PANI. The membranes exhibited defect-free structures and lower crystallinities. As the nanofiber loading increased, the CO2 permeability and selectivity of the membranes increased, surpassing the Robeson upper bound limit and approaching the values in 2008. The CO2 permeability and ideal CO2/CH4 selectivity of the nanocomposite membrane loaded with 10 wt.% PANI nanofibers increased to 121.2 Barrer and 33, respectively, showing increments of 64% and 40%.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Ali Behboudi, Toraj Mohammadi, Mathias Ulbricht
Summary: Surface-modified silver nanoparticles with different functional groups were synthesized and used as functional fillers in nanocomposite membranes for membrane bioreactors (MBRs). The modifications successfully immobilized the nanoparticles inside the membrane, reducing silver release. The modified nanoparticles exhibited enhanced antimicrobial activity and improved the antifouling properties of the membranes. This led to significant improvements in MBR performance, with increased flux, COD removal, and flux recovery.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Polymer Science
Negin Asadi Arbabi, Mahsa Ostadi, Fariba Sadat Kamelian, Toraj Mohammadi, Soheil Zarghami, Mona Dehghankar
Summary: Membrane bioreactors (MBRs) have gained attention in recent years as biotechnology-based wastewater treatment processes. However, the issue of membrane fouling/biofouling has limited their widespread use. A novel MIL-101(Cr) (MCPs)/polyethersulfone (PES) composite membrane was prepared using the phase inversion method. Adding 0.4 wt% MCPs significantly improved the hydrophilicity and pore characteristics of the membrane, resulting in reduced fouling/biofouling. The optimal composite membrane exhibited improved water flux, fouling resistance, and COD removal efficiency.
Article
Engineering, Chemical
Saeed Seraj, Toraj Mohammadi, Maryam Ahmadzadeh Tofighy
Summary: For the first time, lycopodium was incorporated into a polyvinylidene fluoride matrix to fabricate a lycopodium/polyvinylidene fluoride membrane for desalination applications. The membrane showed superior performance in terms of flux, salt rejection, water contact angle, and hydrophobicity compared to the neat polyvinylidene fluoride membrane. The presence of lycopodium with its hydrophobic nature and interconnected nano-channels in the membrane structure contributed to the improved flux and salt rejection.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Chemical
Romina HMTShirazi, Azarakhsh Heidari, Toraj Mohammadi
Summary: Efficient separation of salts and heavy metal ions from wastewater is crucial for environmental protection and resource recovery. A new hollow fiber nanofiltration membrane (HFNM) with a highly positive charge was developed using HPEI self-assembly and MeI quaternization. The membrane exhibited superb rejection rates of Zn2+ and Mg2+, high water flux, and long-term stability, making it an effective solution for water purification.
Review
Engineering, Chemical
Hamed Faramarzi, Mehran Arzani, Abdollah Khosravanian, Hamidreza Mahdavi, Omid Bakhtiari, Toraj Mohammadi
Summary: The idea of using liquid membranes (LMs) for faster and facilitated transport is theoretically fascinating and promising for various applications. Among the different forms of LMs, supported liquid membranes (SLMs) have shown great selectivity and potential. This review comprehensively analyzes the current state of the art in SLMs for gas separation and discusses the design and application considerations when choosing between polymeric or ceramic supports. The principles of LMs, including their chronology, transport mechanism, and advantages and disadvantages are thoroughly examined, along with the different configurations suggested and their transition from the laboratory to practical implementation.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Review
Engineering, Environmental
Mona Dehghankar, Romina HMTShirazi, Toraj Mohammadi, Maryam Ahmadzadeh Tofighy
Summary: Metal-organic frameworks (MOFs) with highly flexible structures and extraordinary surface area are considered as promising materials for separation processes. However, the challenge lies in improving MOFs' stability and recyclability in membranes and overcoming membrane fouling. This article presents an overview of current progress in the combination of MOFs with polymeric membranes to address these issues.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Mohammad Hosein Moghadasin, Toraj Mohammadi, Maryam Ahmadzadeh Tofighy
Summary: This study reports the successful synthesis and integration of a NaP/GO nanohybrid into a PVA matrix to fabricate mixed matrix membranes. The membranes containing 0.5 wt% NaP/GO exhibited superior separation performance at an elevated temperature, with impressive separation factor and permeate flux.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Setareh Karimzadeh, Romina Hmtshirazi, Toraj Mohammadi, Amir Atabak Asadi
Summary: In this study, an innovative nanofibrous membrane was fabricated using an electrospinning technique for the removal of Cu(II) and Pb(II) ions from contaminated water. The membrane exhibited high removal percentages, good modeling capability, high water flux, suitable reusability, and long-term stability, making it a potential filter for water treatment applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
