Article
Construction & Building Technology
Shayeste Hejazian, Mehdi Ahmadyari-Sharamin
Summary: This study investigated the effect of Arabic and guar gums on the corrosion behavior of steel in a concrete simulator. The results showed that these gums exhibited good inhibitive properties and could resolve the challenge of construction materials corrosion.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Chemistry, Physical
Ahmadyar Qureshi, Sehrish Habib, Muddasir Nawaz, R. A. Shakoor, Ramazan Kahraman, Elsadig Mahdi Ahmed
Summary: This study investigates the effect of polyolefin-based smart composite coatings containing modified halloysite nanotubes decorated with ceria particles on corrosion behavior. The results show that the modified ceria particles can significantly improve the corrosion inhibition performance of the polyolefin coatings by forming Ce(OH)3 and Fe-SDS layers at the cathodic and anodic regions of the steel, thus exhibiting synergistic corrosion inhibition.
APPLIED CLAY SCIENCE
(2023)
Article
Polymer Science
Muhammad Kamran, Anwar Ul Haq Ali Shah, Gul Rahman, Salma Bilal
Summary: This study reported the synthesis of a green Prunus domestica gum grafted polyaniline (PDG-g-PANI) composite by emulsion polymerization for efficient anti-corrosion applications on mild steel and stainless steel in strong corroding environments. The composite exhibited high corrosion inhibition efficiency in both 3.5% NaCl and 1 M H2SO4 solutions, demonstrating its potential as a protective coating material.
Article
Chemistry, Applied
Muddasir Nawaz, Ramazan Kahraman, Maryna G. Taryba, Mohammad K. Hassan, M. Attaei, M. F. Montemor, R. A. Shakoor
Summary: This study developed a modified polyolefin nanocomposite coating by loading a corrosion inhibitor, 2-Mercaptobenzothiazole, into Ceria nanoparticles. Compared to the non-modified polyolefin coatings, the modified coatings exhibited improved corrosion resistance, mechanical properties, and erosion resistance.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Polymer Science
Xiuzhou Lin, Qiang Peng, Song Duan, Chunjiang Zhang, Xulei Chen, Zhiqiang Deng, Baojie Dou, Yingjun Zhang, Xiulei Gao, Zhiwen Fang
Summary: In this study, a ZIF-8 modified fluorinated graphene composite (FG@ZIF-8) was prepared and used as a functional filler to enhance the anticorrosion performance of epoxy coating on carbon steel. The morphology and structure of the FG@ZIF-8 composites were characterized, and it was found that the composition ratio of FG and ZIF-8 influenced the structure and morphology of the composites. The mechanical properties and corrosion resistance of the FG@ZIF-8 modified coatings were investigated, and it was observed that the unique structure and insulation of FG in the filler inhibited corrosive media penetration and prevented electron migration at the coating/matrix interface. The chemical cross-linking between ZIF-8 and the epoxy group increased the density of the coatings, while the dissolution of ZIF-8 inhibited corrosion reactions. Overall, the FG@ZIF-8 modified epoxy coatings exhibited excellent long-term corrosion resistance, which could inspire the development of graphene-based materials for protection of metallic materials.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Food Science & Technology
Toyosi T. George, Ayodeji B. Oyenihi, Fanie Rautenbach, Anthony O. Obilana
Summary: Encapsulation of bioactive-rich plant extracts is an effective method to prevent damage or loss of activity. Microcapsules developed with Moringa oleifera leaf powder extract and different coatings showed varying properties and stability under different storage conditions.
Article
Multidisciplinary Sciences
Sherief A. Al Kiey, Mohamed S. Hasanin, Fakiha El-Taib Heakal
Summary: The application of green and sustainable anticorrosive coatings for metallic materials is of growing interest. In this study, a stable crystalline chitosan/gum Arabic composite (CGAC) nanopowder was successfully synthesized and tested for its anticorrosion ability on mild steel. The results showed that the nanocomposite coating provided good corrosion resistance, with higher doses of CGAC resulting in increased protection efficiency. Additionally, the coating was found to block corrosive sites on the steel surface and protect against aggressive chloride ions.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Hanlin Shao, Yibo Cao, Zhihao Chen, Wei Ding, Xiaoshuang Yin, Yun Chen, Ying Liu, Wenzhong Yang
Summary: In this study, gum arabic (GA), a biological macromolecule, is used as a green stabilizer to prepare aqueous dispersions of GA-PANI nanofillers. These nanofillers exhibit excellent dispersion, stability, and compatibility in waterborne epoxy matrix. The GA-PANI nanofillers also enhance the corrosion resistance of the coating and provide favorable adhesion and anodic protection.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Mohammad Ali Asaad, Ghasan Fahim Huseien, Mohammad Hajmohammadian Baghban, Pandian Bothi Raja, Roman Fediuk, Iman Faridmehr, Fahed Alrshoudi
Summary: The study investigated the inhibiting effect of Gum Arabic-nanoparticles (GA-NPs) on the corrosion of reinforced concrete exposed to carbon dioxide for 180 days. The results showed that incorporating 3% GA-NPs inhibitor into concrete formed a protective layer over the steel reinforcement, significantly inhibiting corrosion and improving carbonation resistance.
Article
Nanoscience & Nanotechnology
Lin Cao, Wei Wang, Jia Cheng, Tong Wang, Yue Zhang, Lei Wang, Wen Li, Shougang Chen
Summary: The article introduces a durable self-healing coating for marine corrosive environments, which utilizes a novel nanofiber network filler for enhanced protection. Density functional theory calculations and molecular dynamics simulations are used to verify the corrosion resistance of the coating.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Construction & Building Technology
Chandra Sekhar Das, Haibing Zheng, Xiao-Lin Zhao, Jian-Guo Dai
Summary: Chloride-induced corrosion is a severe problem for reinforced concrete structures in marine environments. This study assessed the effectiveness of alkali-activated slag (AAS) coatings in inhibiting corrosion of steel reinforcement in seawater sea-sand concrete. The results showed that AAS coatings are effective in preventing steel corrosion in both normal strength and ultra-high performance seawater sea sand concrete. However, conventional cement coating was only effective in the ultra-high performance concrete. The protective effects of the coatings were attributed to prepassivation of steel reinforcement and the coatings' chloride barrier effect.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
M. O. M. Danyliak, Yu. Ya. Rizun
Summary: This study investigated the inhibiting ability of the environmentally friendly corrosion inhibitor, gum arabic, using electrochemical methods. The results showed that gum arabic effectively reduced corrosion currents of the steel, with optimal efficiency observed at a concentration of 2 g/liter. Scanning electron microscopy and EDX analysis revealed an increase in carbon and oxygen contents on the surface of the steel after exposure to the inhibited solution, highlighting the enhanced anticorrosion action of gum arabic.
Article
Biochemistry & Molecular Biology
Gaetano Palumbo, Dominika Swiech, Marcin Gorny
Summary: This study investigates the corrosion inhibition performance of guar gum (GG), a natural polysaccharide, on N80 carbon steel in CO2-saturated saline solution. The results show that GG exhibits good inhibition performance at lower and higher temperatures, with efficiency reaching 76.16% and 63.19% at 25 and 50°C, respectively. The inhibition efficiency of GG increases with higher concentration and immersion time but decreases with increasing temperature. EIS and potentiodynamic measurements reveal the adsorption and protective nature of GG on the metal surface.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Food Science & Technology
Tatenda Gift Kawhena, Umezuruike Linus Opara, Olaniyi Amos Fawole
Summary: The effects of gum arabic coatings combined with lemongrass oil and/or pomegranate peel extract on 'Wonderful' pomegranate fruit were studied. The findings suggest that these coatings can be a beneficial postharvest treatment to reduce weight loss and decay development during cold storage.
Article
Chemistry, Applied
Frank Sznaider, Carlos A. Stortz, Ana M. Rojas, Diego A. Navarro
Summary: Traditionally, Brea gum obtained from the cuts made in the trunk and branches of Cercidium praecox tree is used as a substitute for gum Arabic in regions of Argentina. The rheological performance of purified Brea gum in water was evaluated and it showed higher initial thickening and pseudoplastic behavior compared to gum Arabic.
FOOD HYDROCOLLOIDS
(2023)
Article
Chemistry, Physical
Neelakandan M. Santhosh, Kush K. Upadhyay, Gregor Filipic, Janez Zavasnik, Maria de Fatima Montemor, Uros Cvelbar
Summary: Portable electronic devices require high-performance miniaturised electronic components, preferably produced at low cost. Currently, aluminium electrolytic capacitors (AECs) are commonly used, but they are bulky and have narrow electrochemical performance. In this study, an alternative compact capacitor design using vertically aligned carbon nanostructures as the electrode was fabricated and showed high capacity and low resistance, suggesting its suitability for high-frequency filtering applications.
Article
Construction & Building Technology
B. Sena da Fonseca, A. P. Ferreira Pinto, M. Rucha, M. M. Alves, M. F. Montemor
Summary: Consolidation improves the cohesion of stones and preserves stone-built heritage. However, it also modifies other characteristics that affect stone vulnerability to salt crystallization, especially in porous limestones. This study evaluates the compatibility of alkoxysilanes and phosphate-based treatments with a historic porous limestone in both short-term and medium/long-term perspectives. The findings reveal the potential risks of salt entrapment and development of subflorescences when using consolidants, highlighting the importance of addressing consolidation of damaged stones with proper compatibility.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Electrochemistry
A. C. Alves, Jorge P. Correia, Teresa M. Silva, M. F. Montemor
Summary: The birnessite structure of MnO2 makes it a promising electrode material for energy storage devices, especially supercapacitors, due to its high theoretical capacitance and pseudocapacitive response. The effect of alkali cations on the structure of birnessite has been discussed, but their role in the charge storage mechanism is still controversial. This study reveals new aspects of the pseudocapacitive charge storage mechanism of birnessite and discusses the contribution of non-faradaic and faradaic reactions based on EIS analysis. It demonstrates the role of alkali ions intercalation in the interlayer structure of birnessite.
ELECTROCHIMICA ACTA
(2023)
Article
Materials Science, Multidisciplinary
Sehrish Habib, Adnan Khan, Salman M. M. Ismail, R. A. Shakoor, Ramazan Kahraman, Elsadig Mahdi Ahmed
Summary: A smart self-healing epoxy coating system using modified halloysite nanotubes (HNTs) and 8-hydroxyquinoline (8HQ) as a corrosion inhibitor was designed for corrosion protection of steel. The loaded HNTs were capped with cobalt (II) to achieve controlled release of the inhibitor. The smart coatings exhibited excellent corrosion inhibition performance due to the efficient release of the loaded inhibitor from the capped HNTs. This study demonstrated the effectiveness of 8HQ in mitigating corrosion through controlled and efficient release of the inhibitor.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Polymer Science
Tiago A. R. Silva, Ana C. Marques, Rui G. dos Santos, Rana A. Shakoor, Maryna Taryba, Maria Fatima Montemor
Summary: Bio-based polyols were obtained from the thermochemical liquefaction of pinewood and Stipa tenacissima, and successfully used as a green raw material to produce bio-based polyurethane coatings. The coatings exhibited moderate thermal stability, mild hydrophobicity, and good corrosion protection properties. These BioPU coatings have great potential for various applications and further modification with bio-based fillers and corrosion inhibitors.
Article
Materials Science, Multidisciplinary
Junaid Saleem, Zubair Khalid Baig Moghal, Adriaan S. Luyt, R. A. Shakoor, Gordon McKay
Summary: Spin coating is commonly used to prepare thin films with uniformity and controlled thickness. However, it has not been successful in producing free-standing thin films of polyolefins due to their insufficient strength. In this study, we have achieved free-standing thin films of polyolefins, such as polyethylene, with varying thickness. These films can be used for hydrophobic coating, filtration membranes, and oil-sorbents.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Electrochemistry
Rodrigo Braga, Diana M. Fernandes, Alberto Adan-Mas, Teresa M. Silva, M. F. Montemor
Summary: The introduction of pillared agents or dopants to graphene in supercapacitor electrodes can improve ion transfer and electrochemical performance. This study evaluates the effect of different nitrogen (N) and sulfur (S) precursors on doped graphene flakes (GF). Co-doping with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole results in a specific capacitance of 48 F.g(-1) and over 90% capacitance retention after 10,000 cycles.
Article
Biochemistry & Molecular Biology
Junaid Saleem, Zubair Khalid Baig Moghal, Rana Abdul Shakoor, Gordon McKay
Summary: The use of PP in disposable items such as face masks, gloves, and personal protective equipment has increased significantly during and after the COVID-19 pandemic, leading to the presence of microplastics and nanoplastics in the environment. Upcycling waste PP into useful products provides a sustainable solution for managing plastic waste and promoting a circular economy.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Electrochemistry
R. S. Sampaio, T. M. Silva, M. F. Montemor
Summary: This work investigates the growth of manganese oxide on stainless steel for pseudocapacitor electrodes using a one-step potentiostatic method. The microstructure of the electrode material and its capacitive response were analyzed through in situ ellipsometry and electrochemical impedance spectroscopy. The results reveal the formation of three layers during the potentiostatic synthesis of manganese oxide on stainless steel: thickening of the native oxide layer on the substrate, and the growth of two distinct layers of manganese oxide. The inner layer is slightly more compact and resistive, while the outer layer is more porous.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Muhammad Irfan, Noor Tahir, Muhammad Zahid, Saima Noreen, Muhammad Yaseen, Muhammad Shahbaz, Ghulam Mustafa, Rana Abdul Shakoor, Imran Shahid
Summary: Rapid industrialization and urbanization are significant issues causing environmental pollution. This study successfully improved the degradation efficiency of dyes by synthesizing a novel photocatalytic nanocomposite.
Article
Polymer Science
Junaid Saleem, Zubair Khalid Baig Moghal, Rana A. Shakoor, Adriaan S. Luyt, Gordon McKay
Summary: Mixed polyolefin-based waste requires immediate attention to mitigate its negative impact on the environment. The separation of these plastics is energy-intensive due to their similar densities, and they cannot be blended without compatibilizers due to their inherent incompatibility. This study presents non-wettable microporous sheets made from recycled polyethylene (PE) and polypropylene (PP), which demonstrate efficient oil-water separation and high reusability. These findings emphasize the importance of sustainable solutions for plastic recycling and mitigating oil spill problems.
Article
Energy & Fuels
Buzaina Moossa, Jeffin James Abraham, Ranasinghe Arachchige Harindi Gayara, Abdul Moiz Ahmed, Rana Faisal Shahzad, Ramazan Kahraman, Siham Al-Qaradawi, Shahid Rasul, Rana Abdul Shakoor
Summary: Transition metal layered oxide materials with a general formula NaxMO2 have been widely researched for their potential as electrode materials in sodium ion batteries. In this study, O3-type NaNi(1-x)/2Mn(1-x)/2MoxO2 cathode materials were synthesized and their structural, thermal, and electrochemical performance were investigated. The addition of molybdenum improved the thermal stability and electrochemical performance of the cathode materials. The NaNi0.475Mn0.475Mo0.05O2 cathode material exhibited excellent specific discharge capacity. Overall, this research presents a promising cathode material for sodium ion batteries.
Article
Chemistry, Multidisciplinary
Norhan Ashraf Ismail, R. A. Shakoor, Noora Al-Qahtani, Ramazan Kahraman
Summary: A multilayered smart epoxy coating was developed and characterized for corrosion prevention of carbon steel. The coating includes zinc-aluminum nitrate-layered double hydroxide and urea-formaldehyde microcapsules, which are reinforced in an epoxy matrix to exhibit excellent self-healing properties.
Article
Chemistry, Multidisciplinary
Aldona Balciunate, Kush K. Upadhyay, Kristina Radinovic, Diogo M. F. Santos, M. F. Montemor, Biljana Sljukic
Summary: The β-Ni(OH)(2) nanoplatelets prepared by a hydrothermal procedure show efficient electrocatalytic performance for oxygen reduction, oxygen evolution, and hydrogen evolution reactions in alkaline media. The material also exhibits superior stability. This research is significant for the development of efficient electrocatalysts.
