Article
Thermodynamics
Monika Szlachta, Klaudia Ordon, Katarzyna Nowicka, Kinga Pielichowska
Summary: The thermal properties of PU materials depend on the load of polysaccharides and bioceramics, with an increase in chitosan fraction leading to higher glass transition temperature and onset temperature of degradation. However, the presence of ceramics did not significantly impact the thermal properties of PU composites.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Polymer Science
Camille Bakkali-Hassani, Dimitri Berne, Pauline Bron, Lourdes Irusta, Haritz Sardon, Vincent Ladmiral, Sylvain Caillol
Summary: This study investigated various catalysts for the preparation of polyhydroxyurethane covalent adaptable networks. The catalyst systems were selected based on their ability to quantitatively promote cyclic carbonate aminolysis with minimal urea formation. The selected networks were extensively characterized using various techniques. The results suggested a catalyst-dependent exchange mechanism, in which the organotin Lewis acid (DBTDL) efficiently promoted transcarbamoylation in PHU, leading to efficient reprocessing.
Article
Materials Science, Composites
Xin-Gang Chen, Ang Li, Yang-Fei Zhang
Summary: Silver nanoparticle-filled thermoplastic polyurethane composites are widely used in various fields, including medical and electronic devices. This study found that the thermal, mechanical, and electrical properties of the composites are significantly influenced by temperature, with changes in thermal conductivity, tensile modulus, and electrical percolation thresholds observed with increasing temperature and AgNP content.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Composites
Eyob Wondu, Zelalem Chernet Lule, Jooheon Kim
Summary: In this study, a composite material with high-charge-storing properties was fabricated by using TPU as the matrix and SrTiO3 particles as a filler. The surface of SrTiO3 particles was functionalized with IPDI to improve the compatibility between the matrix and filler. The resulting composite material exhibited high-dielectric constant, high-thermal stability, and good mechanical properties.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Vladimir Yakushin, Ugis Cabulis, Velta Fridrihsone, Sergey Kravchenko, Romass Pauliks
Summary: The research reveals that spray foam made with HCFO-1233zd-E has lower thermal conductivity and water absorption compared to pouring foam. The cellular structure of foam plays a significant role in determining the thermal conductivity and other properties, which can be influenced by the technological parameters during production process.
Article
Polymer Science
Guilhem Coste, Claire Negrell, Sylvain Caillol
Summary: Polyurethane (PU) foams, with their unique physical properties and easy blowing characteristics, are widely used materials. In recent years, greener alternatives to isocyanates have been explored. One promising approach is the production of polyhydroxyurethanes (PHU), although this typically requires the use of external blowing agents. This study focuses on the synthesis of PHU foams using in situ reactions to produce NIPU foams with a chemical blowing agent.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Olga Yu Vassilyeva, Elena A. Buvaylo, Yevheniia Lobko, Rostyslav P. Linnik, Vladimir N. Kokozay, Brian W. Skelton
Summary: This study aims to apply new organic cadmium salts as fluorescent agents in cross-linked polyurethane materials to create flexible photoluminescent films, which exhibit stable and uniform fluorescent properties.
Article
Engineering, Chemical
Chinmoy Saha, Siva Ponnupandian, Francis R. Costa, Gert Heinrich, Nikhil K. Singha
Summary: This investigation synthesized a new class of polyurethane using bis(hydroxyalkyl) polydimethylsiloxane (PDMS) and isophorone diisocyanate, and prepared PU/LDH nanocomposite via ex-situ technique. The incorporation of LDH significantly improved the thermal stability of the composite, possibly due to the barrier effect of LDH layers. Differential scanning calorimetry study showed that the glass transition temperature (T-g) of the composite increased with LDH loading up to an optimum level.
POLYMER ENGINEERING AND SCIENCE
(2021)
Article
Chemistry, Physical
Lubomir Lapcik, Martin Vasina, Barbora Lapcikova, Yousef Murtaja
Summary: This article investigates the thermal-induced aging of soft polyurethane foams, finding that increasing humidity in the surrounding environment leads to decreased mechanical stiffness, increased permanent deformation, and a loss of elasticity and thermal stability.
Article
Thermodynamics
Rajesh Kumar, Arjun Singh, Mahesh Kumar, Pramod Kumar Soni, Vasundhara Singh
Summary: An energetic composite was developed by mixing octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine with a polymer matrix to improve mechanical strength and stability. The study investigated the effects of different curatives on the kinetic parameters of the composites, showing significant variation in activation energy in HTPB-based PU matrices.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Polymer Science
Stefan Oprea, Violeta Otilia Potolinca
Summary: Water-dispersible polyurethanes were prepared through a two-step polymerization procedure using polypropylene glycol (Mn = 2000), polyethylene glycol (Mn = 1500), and diisocyanates with different structures (aliphatic, cycloaliphatic, and aromatic). It was found that the diisocyanate structure influenced the molecular morphology, contact angle, and physical characteristics of the water-dispersible polyurethanes. Intermolecular connections and hard segment structure were closely related, with the presence of PEG improving aggregation through physical interactions. These environmentally friendly polyurethanes can be used in a wide range of applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Xiang-Zhao Wang, Dong-Mei Xie, Xiao-Li Zhao, Yi-Dong Li, Jian-Bing Zeng
Summary: This study developed sustainable and reprocessable poly(urethane urea) covalent adaptable networks (CANs) by incorporating reversible piperazine-urea bonds (PaUBs) into castor oil-derived polyurethanes (CPUs). The CANs showed variable tensile behavior, excellent malleability, stable reprocessability, and multiple recyclability.
Article
Polymer Science
Yosuke Akae, Masayoshi Sakurai, Toshikazu Takata
Summary: Alcohol moiety-containing stable acylazides have been developed as isocyanate precursors for use as polymerization initiators and monomers. These compounds have shown versatility and efficiency in the synthesis of polyurethanes, with the ability to generate various polyester-polyurethane block copolymers.
Article
Chemistry, Applied
Srihith Polimera, A. Gali, Ariful Rahaman, Mohammed Rehaan Chandan, S. J. Balakumaran, Susanta Kumar Nath
Summary: In this study, low cost and environment friendly fly ash particles and silica particles were used as additives in the rigid polyurethane foam composite. The addition of fly ash increased the compressive strength and glass transition temperature, and decreased water absorption of the foam composite. The FTIR spectra showed no aggregation of hard urea domains in the polyurethane matrix after the addition of silica/fly ash.
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
(2023)
Article
Polymer Science
Jihua Duan, Guichang Jiang
Summary: A novel physically crosslinked polyurethane (PUII) based on isophorone diisocyanates was successfully prepared and characterized. The PUII exhibited various self-assembly morphologies and showed enhanced antibacterial effect when supplemented with an antibacterial agent. Additionally, the antimicrobial polyurethane films displayed good mechanical properties.
Article
Chemistry, Multidisciplinary
Annum Saeed, Mehwish Akhtar, Sonia Zulfiqar, Farzana Hanif, Ibrahim A. Alsafari, Philips O. Agboola, Sajjad Haider, Muhammad Farooq Warsi, Imran Shakir
Summary: In this study, a highly efficient and selective sensor based on thiamine-modified Ag-Cu bimetallic nanoparticles was designed for trace-level determination of 4-aminoantipyrine. The prepared nanocomposite Th@Ag-Cu was characterized, and the modified glassy carbon electrode showed improved analytical signal in detecting 4-AAP.
Article
Chemistry, Multidisciplinary
Al-Zoha Warsi, Fatima Aziz, Sonia Zulfiqar, Sajjad Haider, Imran Shakir, Philips O. Agboola
Summary: In this study, tungsten oxide (WO3), MXene, and a WO3/MXene nanocomposite were synthesized and investigated for their photocatalytic and biological applications. The results demonstrated that the WO3/MXene composite exhibited excellent photocatalytic degradation and antibacterial activity, making it promising for applications in the fields of biology and environment.
Article
Materials Science, Ceramics
Talya Tahir, Dalal Alhashmialameer, Sonia Zulfiqar, Amany M. E. Atia, Muhammad Farooq Warsi, Khadija Chaudhary, Heba M. El Refay
Summary: In this study, Gd3+ doped V2O5/Ti3C2Tx MXene (GVO/MX) hierarchical architectures were synthesized and their electrochemical performance was evaluated. The GVO/MX composite exhibited the highest electrochemical activity and specific capacitance, with a longer cyclic life. This can be attributed to its unique morphology and higher surface area.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Sana Munir, Mirza Mahmood Baig, Sonia Zulfiqar, Muhammad Saqib Saif, Philips O. Agboola, Muhammad Farooq Warsi, Imran Shakir
Summary: In this study, 2D material-based Bi2O3/MXene nanohybrids were successfully prepared with enhanced photocatalytic properties for industrial pollutant degradation, showing potential for practical applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Nusrat Shaheen, Muhammad Farooq Warsi, Sonia Zulfiqar, Muhammad Waqas, Ibrahim A. Alsafari, Akmal Jamil, Muhammad Shahid
Summary: One-dimensional carbon-coated tungsten-doped molybdenum oxide nanowires (WMO@C) were prepared through a hydrothermal method to address the harmful effects of toxic dyes and infectious bacteria. The ternary nanocomposites of WMO@C and graphitic carbon nitride (gCN) were synthesized to enhance the photocatalytic and antibacterial activities for environmental remediation. The integration of gCN reduced the crystallite size of WMO@C to 3.53 and the synthesized nanophotocatalyst exhibited 1D nanowires with an average diameter of 192.33 nm. The WMO@C/gCN nanocomposites effectively degraded colored organic contaminants and inhibited the growth of P. aeruginosa and S. aureus microbes, with degradation rates of 91% for MB, 89% for CV, 92% for MG, 65% for benzimidazole, and 69% for benzoic acid under visible light after 120 minutes. The superior photocatalytic performance of WMO@C/gCN was attributed to its enlarged surface area, reduced electron-hole recombination rate, enhanced charge transfer capacity, and strong redox ability due to the chemical bonds formed between gCN and WMO@C nanowires. The study also investigated important reaction parameters such as pH, temperature, dye concentration, and photocatalyst dose. The facile synthesis route and excellent photodegradation and antimicrobial performance suggest that WMO@C/gCN nanocomposites hold great potential for environmental remediation.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Amna Irshad, H. H. Somaily, Sonia Zulfiqar, Muhammad Farooq Warsi, Muhammad Imran Din, Khadija Chaudhary, Muhammad Shahid
Summary: In this study, NiAl2O4 and silver doped NiAl2O4 were synthesized using a sol-gel approach, and their composite with g-C3N4 was successfully prepared through ultrasonication. The characterization of the fabricated materials was done using various techniques, and the electrochemical behavior of the fabricated electrode materials was investigated using electrochemical techniques. The results showed that Ag-NiAl2O4@g-C3N4 nanocomposite was a more active electrode material compared to the other prepared electrodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Nusrat Shaheen, Muhammad Farooq Warsi, Sonia Zulfiqar, Jalal T. Althakafy, Abdullah K. Alanazi, Muhammad Imran Din, Hala M. Abo-Dief, Muhammad Shahid
Summary: The hydrothermal approach was used to synthesize gCN supported carbon coated Lanthanum doped tungsten oxide (C@LWO/gCN) composite. The photodegradation of malachite green (MG), crystal violet (CV), and methylene blue (MB) cationic dyes was carried out using the prepared C@LWO/gCN composite. Characterization techniques such as XRD, FESEM, EDX, FTIR, BET, and UV/Vis spectroscopy were used to analyze the synthesized samples. The results showed that the incorporation of La ions into WO3 lattice and the reduced band gap of the doped sample significantly enhanced the photodegradation capability of the material.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mehwish Akhtar, Safaa N. Abdou, Tahreem Abdullah, M. H. H. Mahmoud, Zarnish Sabir, Zafar A. K. Khattak, Shagufta Zafar, Sonia Zulfiqar
Summary: The rGO-supported C@Nd2O3 photocatalyst was synthesized using a facile chemical approach and ultrasound radiations to enhance its photocatalytic performance. The synthesized samples were characterized for crystal structure, surface morphology, and chemical composition using UV, XRD, FT-IR, and FESEM. The ternary composite C@Nd2O3/rGO exhibited higher photocatalytic activity than C@Nd2O3, with a 90.93% removal of the dye under 60 min of UV exposure. The improved photocatalytic efficiency can be attributed to the heterojunction formation, high charge separation, and low recombination rate of photogenerated electron-hole pairs.
Article
Materials Science, Multidisciplinary
Mamoona Anwar, Kawthar Saad Alghamdi, Sonia Zulfiqar, Muhammad Farooq Warsi, Muhammad Waqas, Murtaza Hasan
Summary: The most promising strategy for environmental preservation and wastewater treatment is the creation of semiconductor-based photocatalysts. This study focused on fabricating bismuth oxychloride (BiOCl) and silver-decorated bismuth oxychloride (Ag@BiOCl) using a co-precipitation method, and synthesizing a composite of silver-decorated bismuth oxychloride with graphitic carbon nitride sheets (Ag@BiOCl/g-C3N4) through ultrasonication. The photocatalysts were characterized using various techniques, and their efficiency in water treatment and antimicrobial properties were evaluated.
Article
Physics, Condensed Matter
Anza Farooq, Mamoona Anwar, H. H. Somaily, Sonia Zulfiqar, Muhammad Farooq Warsi, Muhammad Imran Din, Ayyaz Muhammad, Amna Irshad
Summary: Magnesium aluminate (MgAl2O4, MAO) and silver doped magnesium aluminate (Ag-MgAl2O4, Ag-MAO) nanomaterials were synthesized using co-precipitation technique. Reduced graphene oxide composite (Ag-MgAl2O4@rGO, Ag-MAO@rGO) was prepared by ultrasonication method for photocatalytic degradation of crystal violet (CV) and phenol in organic effluents. The formation of doped and bare MgAl2O4 was confirmed by XRD, identified functional groups using FTIR, morphology observed by SEM, and optical analysis performed using UV-Visible spectrophotometer. Ag-MAO@rGO exhibited 81.89% CV degradation and 40.51% phenol degradation under sunlight, with hydroxyl radicals as the principal photoactive species.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Ceramics
Tehmina Kousar, Khadijah Mohammedsaleh Katubi, Sonia Zulfiqar, Z. A. Alrowaili, Mohd Zahid Ansari, M. S. Al-Buriahi, Muhammad Aadil, Warda Hassan, Farzana Mahmood, Mehtab Hussain
Summary: Cobalt-nickel mixed ferrite (CNFO) and gadolinium doped cobalt-nickel mixed ferrite (G-CNFO) materials were synthesized using the microemulsion technique. The physicochemical features of the materials were examined, and G-CNFO showed better photocatalytic activity than CNFO under visible light. The optimal parameters for G-CNFO's catalytic properties were investigated, and its enhanced photocatalytic activity was attributed to its tuned band structure, high light harvesting abilities, reduced electron-hole recombination, and nanostructured morphology.
CERAMICS INTERNATIONAL
(2023)
Article
Energy & Fuels
Muhammad Usman Khalid, Khadijah Mohammedsaleh Katubi, Sonia Zulfiqar, Z. A. Alrowaili, Muhammad Aadil, M. S. Al-Buriahi, Muhammad Shahid, Muhammad Farooq Warsi
Summary: A novel Ag-MnO2/MXene@NF electrode was developed by incorporating hydrothermal and post-sonication processes to boost its overall activity. Ag-doping and MXene reinforcement improved the conductivity of MnO2, while the sandwiching of Ag-MnO2 NWs between MXene sheets resulted in a hetero-structured composite with superb conductivity and high surface area. The nanostructured and spongy structure of Ag-MnO2/MXene@NF allowed for higher capacitance, impressive rate capability, and superb cyclic activity, making it suitable for advanced energy storage devices.
Article
Polymer Science
Ahmed Abdelhamid Maamoun, Mirham Abdallah Youssef Barakat, Abd El-Aziz Arafa El-Wakil, Sonia Zulfiqar, Victor James Oghenekohwo
Summary: This study developed a new piezoelectric foam material by preparing flexible polyurethane/calcined waste eggshell (FPU/CWES) composites for transducer applications. Different ratios of CWES (1-5 wt%) were loaded into the FPU matrix. Characterization using various techniques revealed improved properties of FPU/CWES 3% composite, including increased gel fraction, density, thermal stability, compressive and tensile strengths, and piezoelectric coefficient. The lightweight nature, low cost, and advantages over other piezoelectric materials make FPU/CWES composites a promising option for various applications.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Iqra Mustafa, Beriham Basha, Sonia Zulfiqar, Amiza Tahir, Farzana Hanif, M. S. Al-Buriahi, Mehwish Akhtar, Khadija Chaudhary
Summary: L-Cysteine functionalized Ag@MnO2 nanocomposite was synthesized using a hydrothermal method for electrochemical sensing of heavy metal ions (HMIs). Advanced techniques were employed to characterize the composition and morphology of L-Cys/Ag@MnO2. The optimized sensor exhibited high sensitivity towards Cd+2 and Pb+2 ions with LOD of 0.065 nM and 0.052 nM, respectively. The practical applicability of the sensor was also demonstrated in tap water, showing its potential for sensing other toxic metal ions in real samples.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Muhammad Usman Khalid, Maryam Al Huwayz, Sonia Zulfiqar, Eric W. Cochran, Z. A. Alrowaili, M. S. Al-Buriahi, Muhammad Farooq Warsi, Muhammad Shahid
Summary: This study investigates ultralong MnO2 nanowires reinforced with different Cu contents as a new electrode material for supercapacitors. XRD results showed phase transformation of MnO2 from alpha-MnO2 to beta-MnO2 induced by Cu doping. Ultralong nanowires with interconnected network enhance electron transport and electrical conductivity. CV profile and rate law confirmed preferred charge storage follows faradic mechanism. Nanosized morphology and spongy structure of current collector maximize electrode area and protect from pulverization.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
