Article
Nanoscience & Nanotechnology
N. Tan Luong, Noemie Veyret, Jean-Francois Boily
Summary: The variation in air humidity plays a crucial role in controlling water film coverages on reactive minerals, which in turn affects CO2 capture. This study focuses on the growth of amorphous magnesium carbonate on MgO nanocubes exposed to moist CO2 gas, shedding new light on the potential bottleneck for the efficient mineralization of CO2.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Ye Yuan, Xu Yan, Yongjing Wang, Yansong Xiong, Chen Tian, Zhang Lin, Liyuan Chai
Summary: This study investigated the phase stability and transition of nanocrystals under different surface environments using MnS nanocrystals, revealing that a strong surfactant can significantly decrease the critical size for phase transformation. The thermodynamic analysis further demonstrated the decreasing trend of critical size for phase transition was caused by the decreasing of surface free energy.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
M. Stachowicz, A. Wierzbicka, J. M. Sajkowski, M. A. Pietrzyk, P. Dluzewski, E. Dynowska, J. Dyczewski, K. Morawiec, S. B. Kryvyi, S. Magalhaes, E. Alves, A. Kozanecki
Summary: This study analyzed heteroepitaxially grown ZnO/MgO superlattices on a-oriented ZnO substrates. It found that the different crystalline structures of ZnO and MgO influence the abruptness of the interface and the retention of the wurtzite structure. The wurtzite structure can be retained in the MgO thin barriers, but it inevitably leads to non-uniform biaxial strains and interdiffusion of Mg from barriers to ZnO QW's. The complex strain/composition heterogeneities can be explained by the difference in vapor pressure between Mg and Zn elements and the high mobility of Mg atoms. A ZnMgO film of three monolayers size was created at the interfaces, which partly contributes to retaining the wurtzite structure of the coherently grown MgO layers.
APPLIED SURFACE SCIENCE
(2022)
Article
Thermodynamics
Islam Shancita, Neil G. Vaz, Guilherme D. Fernandes, Adelia J. A. Aquino, Daniel Tunega, Michelle L. Pantoya
Summary: The study shows that the reactivity of magnesium particles in reactions with PFPE varies depending on heating rate and particle size. The analysis of material structure during reactions reveals the impact of the specific hydroxide layer on the surface of magnesium particles on the reaction pathways and outcomes.
COMBUSTION AND FLAME
(2021)
Article
Chemistry, Multidisciplinary
Chengkai Xia, Heng Wang, Jung Kyu Kim, Jingyu Wang
Summary: The research focuses on the rational design of metal oxide heterostructures to enhance photo-to-chemical energy conversion efficiency using photocatalytic and photoelectrochemical systems. Strategies to improve conversion efficiency include surface modification, surface regulation, and interfacial assembly with various materials. The underlying reaction mechanisms and challenges in developing metal oxide-based heterostructures for photo-to-chemical devices are also discussed.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Marek Glinski, Ewa M. Iwanek (nee Wilczkowska), Urszula Ulkowska, Agnieszka Czajka, Zbigniew Kaszkur
Summary: The research first aimed to synthesize a pure Upsalite, which would act as a precursor for high-surface, amorphous magnesium oxide. It was found that the type of alcohol reactant used had the most significant effect on the reaction yield. The optimized synthesis conditions were then used to obtain MgO which showed selective catalytic activity in transfer hydrogenation reactions.
Article
Chemistry, Physical
Akinori Saito, Seiji Obata, Yuta Nishina
Summary: MgO has high thermal conductivity and insulation, but readily hydrates with moisture. Coating MgO with graphene oxide (GO) improves its moisture resistance, as the negatively charged GO interacts strongly with the positively charged MgO. Incorporating reduced GO (rGO) further enhances the moisture resistance and thermal conductivity of MgO.
APPLIED SURFACE SCIENCE
(2022)
Article
Environmental Sciences
Mehnaz Shams, Linda M. Guiney, Mani Ramesh, Mark C. Hersam, Indranil Chowdhury
Summary: Graphene nanomaterials have been commercialized and disseminated into surface waters, but their photodegradation in natural aquatic environments is minimal and slow. This study evaluated the photodegradation of graphene oxide and partially reduced graphene oxide in Columbia River Water, finding that both direct and indirect photolysis occur simultaneously. However, the concentrations of photosensitizers in surface water are not sufficient to initiate degradation of graphene oxide. Overall, graphene nanomaterials show minimal phototransformation in natural surface water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Joshua A. Jackman, Bo Kyeong Yoon, Natalia Mokrzecka, Gurjeet Singh Kohli, Elba R. Valle-Gonzalez, Xinyi Zhu, Martin Pumera, Scott A. Rice, Nam-Joon Cho
Summary: Research shows that graphene oxide (GO) can protect Staphylococcus aureus bacterial cells under starvation conditions, increasing their viability. Transcriptomic profiling reveals that bacterial cells generally shut down metabolic activity in starvation conditions, but cells exposed to GO increase production of specific enzymes involved in the glyoxalase detoxification pathway while repressing autolysis.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Mohd Rafie bin Shaharudin, Christopher D. Williams, Amritroop Achari, Rahul R. Nair, Paola Carbone
Summary: We investigate the swelling mechanism of graphene oxide (GO) membranes exposed to different relative humidity (RH) values using Grand Canonical Monte Carlo simulations. Our study reveals that the structure of GO membranes changes as water is adsorbed and the graphene oxide flakes become charged and swell. We find that the surface charge of the flakes drives the water adsorption mechanism, and the membrane undergoes structural changes only at very high relative humidity.
Article
Chemistry, Multidisciplinary
Xuri Wu, Feng Tan, Shizhu Cheng, Yangyang Chang, Xiaochun Wang, Lingxin Chen
Summary: In this study, three types of MXene Ti3C2Tx nanosheets were prepared using different etching methods, and their behavior after exposure to human plasma was investigated. The study found that nanosheets with protein coronas were more prone to aggregation, and proteomic analysis revealed significant differences in the composition and abundance of proteins in the coronas. A random forest classification model identified hydrogen bonding, steric hindrance, and hydrophobic interaction as the main driving forces for the adsorption of plasma proteins on Ti3C2Tx.
Article
Engineering, Chemical
Trung Thanh Nguyen, Vu Anh Khoa Tran, Le Ba Tran, Phuoc Toan Phan, Minh Tan Nguyen, Long Giang Bach, Surapol Padungthon, Cong Khiem Ta, Nhat Huy Nguyen
Summary: This study introduces a new method for removing anions in water by pretreating CER with metal salts. Fe-Mg/CER material shows high nitrate adsorption capacity and good regeneration performance, making it suitable for water and wastewater treatment applications.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Alena I. Komayko, Sergey V. Ryazantsev, Ivan A. Trussov, Natalya A. Arkharova, Denis E. Presnov, Eduard E. Levin, Victoria A. Nikitina
Summary: This study demonstrates that the insertion of magnesium ions into PBA materials is a misconception, and provides conclusive evidence for the infeasibility of this process in both cation-rich and cation-poor nickel, iron, and copper hexacyanoferrates. The charge compensation for PBA redox is attributed to protons rather than divalent ions in aqueous magnesium ion solution.
Article
Green & Sustainable Science & Technology
Arianne A. Silva, Ana Maria F. Sousa, Cristina R. G. Furtado, Nakedia M. F. Carvalho
Summary: Green synthesis is an environmentally friendly process that uses plant extracts to prepare magnesium oxide nanoparticles (MgONPs), which have multiple applications. Green MgO shows promising antibacterial, antioxidant, anti-cancer, and luminescent properties, with applications in medicine and agriculture. This review discusses the synthesis, characterization, and applications of MgONPs using plant extracts.
MATERIALS TODAY SUSTAINABILITY
(2022)
Article
Chemistry, Physical
Marek Glinski, Agnieszka Czajka, Urszula Ulkowska, Ewa M. Iwanek (nee Wilczkowska), Dariusz Lomot, Zbigniew Kaszkur
Summary: This study investigates the synthesis of Mg(OH)(2) using magnesium nitrate, chloride, or sulphate, finding that the counter ion strongly influences purity and specific surface area. Factors such as calcination temperature and choice of precipitating agent also play a role in the properties of the obtained MgO.
Article
Engineering, Chemical
Somaye Sadat Miri, Fereshteh Meshkani, Ali Rastegarpanah, Mehran Rezaei
Summary: The catalytic and structural properties of mesoporous nanocrystalline 10 wt.% Ni-MeOx-MgAl2O4 catalysts were investigated in dry reforming of methane. The addition of Ce significantly improved the catalytic performance, suppressing carbon deposition and enhancing CH4 conversion. The 3 wt.% Ce-promoted catalyst exhibited the best performance in terms of high CH4 conversion and low carbon deposition.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Mohammad Varbar, Seyed Mehdi Alavi-Amleshi, Mehran Rezaei, Ehsan Akbari
Summary: Methane catalytic oxidation was investigated over Ni/MgAl2O4 catalysts synthesized by a solid-state mechanochemical preparation method. The catalysts displayed high catalytic activity, with the increment in Ni loading improving CH4 conversion and CO2 selectivity. The study also found that increasing the O2:CH4 molar ratio and gas hourly space velocity enhanced CH4 conversion. However, a higher calcination temperature had a negative influence on the catalytic activity.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Ehsan Akbari, Seyed Mehdi Alavi, Mehran Rezaei, Afsanehsadat Larimi
Summary: The study focused on Lean methane catalytic combustion over various noble metal catalysts supported on 10 wt% BaO-MnOx, with the Rh/BM catalyst showing a significant improvement in light-off temperature. The 1 wt% Rh/BM catalyst exhibited the best performance and high stability even in the presence of CO2 and water vapor. Additionally, the catalyst showed high activity in CO oxidation process at low temperatures.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Parisa Shafiee, Seyed Mehdi Alavi, Mehran Rezaei, Farzad Jokar
Summary: Fe, Mn, La, Ce, and Ba-promoted 15 wt%Ni-12.5 wt%Co-Al2O3 catalysts show improved catalytic performance in CO2 methanation reaction, with the Fe-promoted catalyst exhibiting the highest catalytic activity. The study also evaluated the effect of calcination temperature, feed composition, and gas hourly space velocity (GHSV) on the catalyst performance, confirming the Fe-promoted catalyst's superior performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Chemical
Zahra Ashouri Mehranjani, Majid Hayati-Ashtiani, Mehran Rezaei
Summary: The study explored the use of acid-activated natural bentonite as an adsorbent for Ni2+ ions in wastewater, showing that acid activation was crucial in enhancing the adsorption capacity. Factors such as pH and time concentration were found to be significant in the acid activation process and successful uptake of Ni2+.
PARTICULATE SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Mohammad Varbar, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: In this study, magnesium aluminate spinel was prepared as a catalyst support using a novel mechanochemical method. Co-promoted catalysts with 20% Ni were fabricated, with the 3%Co-20%Ni/MgAl2O4 catalyst showing optimal performance. Methane conversion rates of 50% and 90% were achieved at 530 and 600 degrees Celsius, respectively, indicating excellent catalytic activity.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Applied
Xiaofan Zhang, Yuxi Liu, Jiguang Deng, Lin Jing, Linke Wu, Hongxing Dai
Summary: In this work, PtPdx/ZrO2 catalysts were synthesized and characterized for methane oxidation. Among them, 0.44PtPd2.20/ZrO2 exhibited the best catalytic activity and sulfur resistance.
Article
Chemistry, Physical
Saba Kazemi, Seyed Mehdi Alavi, Mehran Rezaei
Summary: The study demonstrated that increasing the nickel content in NiO(x)/FeAl2O4 catalysts can enhance the catalytic activity, but excessive nickel loading may reduce the catalytic efficiency. The catalyst with 50% NiO showed excellent potential in the thermocatalytic decomposition of methane.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
F. Barzegari, M. Rezaei, M. Kazemeini, F. Farhadi, A. R. Keshavarz
Summary: This study examines the performance of NiO-MgO-SiO2 catalysts with different promoter loadings in the propane dry reforming reaction. The addition of promoters enhances the metal-support interaction and basic characteristics of the catalysts. Ce-promoted catalyst exhibits the highest propane conversion, while La and Y-promoted catalysts show relatively poor performance. Ce-promoted catalysts demonstrate the best catalytic performance due to their sufficient active sites, high oxygen mobility, and appropriate acidic/basic characteristics. Zr-promoted catalyst shows the highest coke deposition, while Ce-promoted catalyst exhibits the lowest carbon formation. The optimal loading of ceria is suggested to be 3 wt. %.
MOLECULAR CATALYSIS
(2022)
Article
Energy & Fuels
F. Barzegari, M. Kazemeini, M. Rezaei, F. Farhadi, A. R. Keshavarz
Summary: In this study, a NiO-MgO-SiO2 catalyst was prepared and subjected to calcination at different temperatures for syngas production via propane dry reforming. Increasing the calcination temperature led to lower catalyst basicity, while the highest propane and CO2 conversions were achieved at 650 degrees C.
Article
Chemistry, Multidisciplinary
Maryam Mirasgari, Seyed Mehdi Alavi, Mehran Rezaei
Summary: This study investigated the effects of adding Mn and Co on the performance of catalysts. It was found that adding Mn improved the catalytic activity and thermal stability, while adding Co led to a slight decrease in performance.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Energy & Fuels
Farzad Jokar, Seyed Mehdi Alavi, Mehran Rezaei
Summary: This study investigates the effect of pore shape on the hydroisomerization of n-pentane by synthesizing composites with different pore structures. The results demonstrate that a well-developed micro/mesoporous structure with higher specific surface area improves the yield and conversion, while a better balance between acidic and metallic sites enhances the RON of the product stream.
Article
Chemistry, Physical
Mohammad Varbar, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: The textural features and catalytic efficiency of Mn-promoted Ni/MgAl2O4 catalysts were evaluated in the catalytic combustion of lean methane. The addition of manganese oxide improved the structural features and light-off temperatures, while the decrease in calcination temperature further increased the catalyst performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Hamid Pourdelan, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: NiO-MgO catalysts with different nickel loadings were synthesized and characterized. The 50wt.%NiO-MgO catalyst exhibited the best activity in the methane decomposition process. The addition of Cr2O3 improved the catalytic performance and lifetime of the catalyst.
Article
Energy & Fuels
Maryam Kaviani, Mehran Rezaei, Seyed Mehdi Alavi, Ehsan Akbari
Summary: In this study, Ni-SiO2@SiO2 core-shell catalysts were prepared and the effect of nickel content and calcination temperature on the catalytic activity was investigated. The results showed that Ni-SiO2@SiO2 catalyst with 10% Ni loading exhibited stable and high conversion rates of methane and CO2 with minimal carbon deposition. The high stability and carbon resistance properties of the catalyst were attributed to the strong Ni-SiO2 interaction and coverage of Ni particles by SiO2. The catalytic activity gradually improved with increasing calcination temperature.
Article
Engineering, Chemical
Ri Zhang, Shasha Zhang, Mengyan Ding
Summary: A thin liquid film method is proposed to evaluate sand erosion in annular flow. This method considers the direct interaction between the liquid film and gas core, as well as the entrainment and deposition of droplets. The erosion rate is calculated by considering the effects of liquid entrainment and particle velocity decay. The method is fully verified by comparing with experimental data.
Article
Engineering, Chemical
Yu Suo, Xianheng Su, Wenyuan He, Xiaofei Fu, Zhejun Pan
Summary: This research investigates the mechanical properties of sandstone-shale composite through orthogonal experimental method and discrete element simulation. The results show that different lithologies and thickness ratios can affect the strength and fracture mode of the composite rock samples.
Article
Engineering, Chemical
Maurizio Troiano, Andrea El Hassanin, Roberto Solimene, Alessia Teresa Silvestri, Fabrizio Scala, Antonino Squillace, Piero Salatino
Summary: This study investigates the potential of Fluidized Bed Finishing (FBF) for square flat AlSi10Mg specimens manufactured via Laser-Powder Bed Fusion (L-PBF) additive manufacturing technology. The results show that good finishing can be achieved using rotation-assisted tests, with a maximum reduction of surface roughness by 67%. Steel particles are found to be the most effective bed material.
Review
Engineering, Chemical
Ningbo Song, Wanzhong Yin, Jin Yao
Summary: Seawater's dissolved salts and minerals have various effects on the flotation process, including influencing the characteristics and behavior of flotation factors, as well as affecting the surface of sulfide minerals. In most cases, seawater has adverse effects on the flotation of sulfide minerals, but these effects can be mitigated by adjusting the reagents.
Article
Engineering, Chemical
Kaiqiao Wu, Shuxian Jiang, Victor Francia, Marc-Olivier Coppens
Summary: In rectangular and cylindrical annular fluidized beds, pulsating gas flow can create regular bubble patterns, overcoming challenges seen in conventional units. This study provides new opportunities for modularization of fluidized bed operations.
Article
Engineering, Chemical
Shuo Li, Huili Zhang, Jan Baeyens, Miao Yang, Zehao Li, Yimin Deng
Summary: The paper assesses the behavior of cohesive Geldart C-type particles when fluidized by air with the aid of vibration. It determines that mechanical vibration is a simple and effective method to improve the fluidity of cohesive particles during fluidization.
Article
Engineering, Chemical
Zhenfei Feng, Qingyuan Zhang, Shanpan Liang, Zhenzhou Li, Fangwen Guo, Jinxin Zhang, Ding Yuan
Summary: A new micro/mini-channel heat sink (MCHS) with a combined structure of longitudinal and transverse vortex generators is designed, using Al2O3 nanofluid as the working medium. The study explores the effects of transverse vortex generator shape and longitudinal vortex generator angle on the hydraulic and thermal characteristics, comprehensive performance, entropy generation, and exergy efficiency. The results show that the triangular transverse vortex generator improves the comprehensive performance and exergy efficiency. Combined with the longitudinal vortex generator, the MCHS achieves the best comprehensive performance, entropy generation, and exergy efficiency when the Reynolds number is 742.
Article
Engineering, Chemical
Kostas Giannis, Christoph Thon, Guoqing Yang, Arno Kwade, Carsten Schilde
Summary: This study presents a 3D convolutional neural network (3D-CNN) methodology for generating realistic 3D models of particles. The method trains on 2D projections of particle images to predict their 3D shapes, and evaluates the accuracy of the predictions using Fourier shape descriptors (FSDs). This methodology has wide applications in particle shape analysis.
Article
Engineering, Chemical
Zheng-qing Zhou, Lu-jia Chai, Yu-long Zhang, Ya-bin Wang, Ze-chen Du, Tian-yi Wang, Yu-zhe Liu
Summary: The dynamic oxidation and shell-breaking processes of aluminum nanoparticles (ANPs) during heating were studied using in situ transmission electron microscopy. The results revealed that the changes in shell thickness can be divided into three stages, and the active aluminum content of ANP decreased before shell-breaking.
Article
Engineering, Chemical
Fulei Chen, Huaqing Ma, Zihan Liu, Lianyong Zhou, Yongzhi Zhao
Summary: A particle breakage model based on the particle replacement scheme, using the polyhedral model to describe particles, is proposed in this work to accurately describe the breakage of a large number of particles. Additionally, a fast-cutting algorithm is proposed to reproduce the size distribution of progeny particles determined by the breakage model. The validation and simulation results show satisfactory accuracy, efficiency, and stability of the algorithm.
Review
Engineering, Chemical
Matteo Errigo, Christopher Windows-Yule, Massimiliano Materazzi, Dominik Werner, Paola Lettieri
Summary: Gas-solid fluidized-bed systems have advantages in terms of chemical reaction efficiency and temperature control, making them widely used in industrial applications. However, the design, scale-up, and optimization of these complex units are limited by the lack of deep physical understanding. Non-invasive and non-intrusive diagnostic techniques provide a way for researchers to study these systems without affecting the flow field or directly contacting the medium under study.
Article
Engineering, Chemical
Saeed Fateh, Mohammad Behshad Shafii, Mohammad Najafi, Cyrus Aghanajafi
Summary: Applying a magnetic field to ferrofluids alters their flow characteristics and enhances heat transfer. Through visualization and quantitative investigation, it is found that the magnetic field influences the flow patterns and velocity profiles, improving fluid mixing and vorticity magnitude.
Article
Engineering, Chemical
Lei Gao, Bingbing Wei, Xiaochuan Hu, Zaifeng Yao, Yiwen Fang, Xuejian Gao
Summary: In this study, a numerical model of sand triaxial test was established using discrete element software PFC3D, and an indoor triaxial test was conducted to calibrate the numerical model. The influence of microscopic parameters on the macroscopic mechanical response of sand was analyzed. The results showed that the friction coefficient had the greatest impact on the peak strength and residual strength of the sand's stress-strain curve, and it was positively correlated. The normal tangential stiffness ratio was negatively correlated, while the porosity and boundary flexibility stiffness had minimal influence on it.
Article
Engineering, Chemical
Xuan Liu, Jie Gong, Kai Jiang, Xiaojuan Lai, Yu Tian, Kang Zhang
Summary: This study aimed to improve the performance of lignite coal water slurries (CWSs) by synthesizing a series of three-arm amphiphilic block copolymers. By controlling the relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content, the apparent viscosity of CWSs was significantly reduced and the static stability was improved. Thermogravimetric testing and XPS analysis were conducted to reveal the mechanism behind the improved performance.
Article
Engineering, Chemical
Lanka Dinushke Weerasiri, Daniel Fabijanic, Subrat Das
Summary: Fluidization at low pressure offers significant benefits for the fine chemical industry. This study investigates the behavior of bubbles and bed expansion under low pressure conditions. It is found that lower pressure leads to larger bubbles, increased bubble quantity, and higher aspect ratio. The predictability is affected by the inhomogeneous fluidization, but low pressure fluidization can generate similar bubble sizes with lower fluidizing mass compared to atmospheric pressure.
