Article
Materials Science, Ceramics
S. Simon, V. Simon
Summary: The effect of treatment temperature on the atomic environment in chromium doped lanthanum oxide synthesized by glycerol-assisted sol-gel route was investigated. Different phases were developed in the treated samples as temperature rises, leading to an increase in crystallite size and surface basicity, potentially enhancing catalytic activity. The X-ray diffraction, Fourier transform infrared, and X-ray photoelectron spectroscopy analyses were used to detect structural changes influencing sample properties.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
Kumud Choudhary, Richa Saini, Gaurav K. Upadhyay, L. P. Purohit
Summary: Yttrium doped ZnO:CdO nanocomposite thin films were prepared and studied for CO2 gas sensing. The YZC2 sample showed promising gas sensing performance and suitable for CO2 gas sensing application. Characterization of the films was conducted using XRD, FE-SEM, and UV-Vis spectroscopy to analyze their structural, surface, and optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Anis Muneerah Shaiful Bahari, Siti Zubaidah Othman, Mohammad Faizulizwan Mohamad Fadli, Mohd Zul Amzar Zulkifli, Saidatul Akmal Biyamin, Mohammad Aminul Islam, Zarina Aspanut, Nowshad Amin, Halina Misran
Summary: Zr-MOG, a novel zirconium-based metal-organic gel, was successfully synthesized in an amorphous state without chloride ions and toxic modulators, overcoming some drawbacks of metal-organic frameworks in industrial applications. It exhibited a disordered wormhole-like structure similar to mesoporous silica materials.
SURFACES AND INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Ekaterina V. Ilyina, Yuri Y. Gerus, Svetlana V. Cherepanova, Alexander F. Bedilo
Summary: Calcium aluminate aerogels with mayenite stoichiometry C12A7 were prepared for the first time. The surface area of amorphous aerogel obtained after hydrolysis with stoichiometric amount of water was about 330 m(2)/g after supercritical drying and 170 m(2)/g after calcination at 500 degrees C. The presence of diphenyloxyl nitroxyl radicals on the surface of calcined C12A7 aerogels suggests the existence of mayenite cages capable of stabilizing active forms of oxygen.
Article
Chemistry, Physical
Narthana Kandhasamy, Gopal Ramalingam, Govindhasamy Murugadoss, Manavalan Rajesh Kumar, Gunasekaran Manibalan, Rajabathar JothiRamalingam, Hemraj M. Yadav
Summary: The study successfully synthesized highly uniform copper and zinc oxide anchored nanoparticles on the surface of silica using a sol-gel method. Detailed structural and compositional analyses were carried out using X-ray diffraction, X-ray photoelectron spectroscopy, Laser Raman, field emission scanning electron microscopy, and transmission electron microscopy. The charge-discharge results showed excellent performance in specific capacitance at high current densities for the composite materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Prathibha Vasudevan, Arun S. Prasad
Summary: Zinc oxide nanoparticles were successfully synthesized using sol-gel technique and Azadirachta indica leaves extract, with characterization done through various techniques to study their structure, size, morphology, and crystallite parameters. Optical properties investigation showed that these nanoparticles have potential for white luminescence applications.
JOURNAL OF CLUSTER SCIENCE
(2021)
Article
Materials Science, Ceramics
Mehrnoush Nakhaei, Marcos A. L. Nobre, Davoud Sanavi Khoshnoud, Martin Bremholm, Hossein Ali Khonakdar
Summary: Crystalline and single-phase Y1-xScxFeO3 (x = 0, 0.5 & 1) nanoparticles were synthesized by sol-gel method. The nanocrystals had sizes ranging from 30 to 39 nm as determined by X-Ray Diffractometry (XRD). The morphology and surface characteristics of the samples were analyzed using Field Emission Scanning Electron Microscopy (FE-SEM) and energy dispersive spectroscopy (EDS). The magnetic properties of the samples exhibited antiferromagnetic and paramagnetic behaviors, while the electrical properties showed polarization-electric loops, dielectric constant changes, and dielectric loss through frequency and temperature. The band gap energy of YFeO3 and ScFeO3 was calculated to be 2.97 and 3.07 eV, respectively, using diffuse reflectance spectroscopy analysis.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ummer Altaf, Mohd Zubair Ansari, Seemin Rubab
Summary: The synthesis of Sn1-xAlxO2 (x = 0.0, 0.01, 0.02, 0.03, 0.04) nanoparticles by the sol-gel method and their characterization using various techniques revealed that increasing the aluminium content led to a decrease in the crystallite size and optical band gap. Photoluminance measurements showed violet emissions for all samples, with the 3% doped sample exhibiting the lowest intensity, indicating its potential for applications in photocatalysis and lithium-ion batteries. Additionally, 3% aluminium doping was found to be the optimum concentration for tin oxide samples in photocatalytic applications.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Monmon Podder, Md. Farid Ahmed, Md. Rassel Moni, Md. Lutfor Rahman, Bristy Biswas, Nahid Sharmin
Summary: The bright blue nano crystallite cobalt aluminate (CoAl2O4) was synthesized using a sol-gel method with a mixture of glycerol and citric acid as chelating agents. The effects of different metal ion concentrations (0.05, 0.075, 0.10, 0.25, 0.50, and 0.75 mol/L) on the structural, morphological, and color properties of the synthesized CoAl2O4 were analyzed using various techniques including X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, nanoparticle size analysis, simultaneous thermal analysis, UV-vis absorption spectrometry, and CIE-LAB colorimetric analysis. The results showed that the crystallite size, lattice strain, dislocation density, lattice constant, cell volume, band gap, and color properties of the cobalt aluminate were influenced by the metal ion concentration.
ARABIAN JOURNAL OF CHEMISTRY
(2023)
Article
Optics
B. Sundarakannan, M. Kottaisamy
Summary: The red-emitting zinc oxide material prepared exhibits a broad band emission under blue light excitation with a peak emission at 540 nm and strong infrared light absorption. When excited by blue LEDs, it emits bright broad band red light with a peak emission at 625 nm and a CIE chromaticity value of (x=0.65, y=0.37).
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Physical
Ahsan Quddus, Syed Zia Hussain Hashmi, Ghulam Mustafa, Muhammad Khalid, M. G. B. Ashiq, Ghazanfar Nazir, Thamraa Alshahrani, Mohammed S. Alqahtani, Kiran Naz
Summary: In this study, nickel-doped zinc ferrites were successfully synthesized to modify the high-frequency dielectric and magnetic properties of zinc ferrites. Various characterizations were conducted to examine the crystal structure, absorption bands, dielectric properties, and magnetic properties. The results showed that the incorporation of nickel increased crystallite size, reduced lattice parameters, and enhanced magnetic properties. Overall, the nickel-doped zinc ferrites exhibited notable structural, magnetic, and dielectric properties, suggesting their potential utility in microwave and high-storage magnetic devices.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Ceramics
Hiroyuki Hayashi, Keita Kouzai, Yuta Morimitsu, Isao Tanaka
Summary: Despite extensive research, accurately predicting successful synthesis conditions for new pseudo-binary oxides remains a challenge. This study introduces a synthesis-condition recommender system to efficiently explore a wide chemistry space and successfully discovered two yet-to-be-found pseudo-binary oxides through systematic synthesis experiments.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Rina R. Tikare, Rohit R. Powar, Sharadchandra S. Patil, Dhanaji G. Kanase
Summary: Mixed metal oxides with different iron content (x = 0.2-1.0) were synthesized using sol-gel auto combustion process. The properties of the oxide materials were characterized using various techniques. The results showed that the replacement of aluminium ions affected the structure, bandgap, and crystallite size of the mixed metal oxides. The iron-substituted aluminate gas sensors exhibited good performance in detecting gases such as CO, H2S, and NO2.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Ingrid Milosev, Damir Hamulic, Peter Rodic, Charly Carriere, Sandrine Zanna, Hanna Budasheva, Dorota Korte, Mladen Franko, Dimitri Mercier, Antoine Seyeux, Philippe Marcus
Summary: Siloxane-polyacrylic coatings were synthesized from different acrylate derivatives and tetraethyl orthosilicate. By using various analytical techniques, the coatings were characterized in terms of their composition, structure, wettability, thermal properties, and porosity. The study found that the chemical structure of the coatings significantly influenced their performance, especially in terms of corrosion resistance and porosity.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Hafiz Muhammad Tahir Farid, Muhammd Noman Saeed, Soumaya Gouadria, Fatemah Farraj Alharbi, Salma Aman
Summary: In response to concerns about fossil fuel pollution, energy-saving strategies and programs have been developed by relevant organizations. Supercapacitors, compared to conventional batteries, offer advantages such as faster charge and discharge times, higher power density, longer cycle life, and less negative impact on the environment. Researchers have explored the use of perovskite as an eco-friendly electrode for energy conversion devices. This study developed a sol gel route to produce ZnMnO3 for supercapacitor applications, and various characterization techniques were used to analyze its properties. The results showed that the fabricated perovskite demonstrated high capacitive efficiency, good stability, and the potential to replace other polluted energy sources.
Article
Multidisciplinary Sciences
Zhaoyuan Lyu, Shichao Ding, Peter Tieu, Lingzhe Fang, Xin Li, Tao Li, Xiaoqing Pan, Mark H. Engelhard, Xiaofan Ruan, Dan Du, Suiqiong Li, Yuehe Lin
Summary: In this study, a single-atomic site catalyst (SASC) with excellent catalytic activity was designed to enhance the portable detection performance of herbicides. The catalyst exhibited superior peroxidase-like (POD-like) activity and was used as a label in lateral flow immunoassay (LFIA) for herbicide detection. The Fe-SASC-LFIA achieved a linear detection range of 1-250 ng/mL with a low limit of detection (LOD) of 0.82 ng/mL for 2,4-dichlorophenoxyacetic acid (2,4-D). The method demonstrated excellent specificity and selectivity towards 2,4-D and showed promising results in the detection of human urine samples, indicating its potential as a portable and high-sensitive point-of-care (POC) detection strategy for pesticide exposure evaluation.
Article
Nanoscience & Nanotechnology
Xianhui Zhang, Peiyuan Gao, Zhaohui Wu, Mark H. Engelhard, Xia Cao, Hao Jia, Yaobin Xu, Haodong Liu, Chongming Wang, Jun Liu, Ji-Guang Zhang, Ping Liu, Wu Xu
Summary: In this study, a pinned EEI layer is designed to stabilize a SPAN cathode by regulating the EEI formation mechanism in an advanced LiFSI/ether/fluorinated-ether electrolyte. This design strategy improves the chemical stability and electrochemical performance of Li||SPAN batteries.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Shichao Ding, Jordan Alysia Barr, Zhaoyuan Lyu, Fangyu Zhang, Maoyu Wang, Peter Tieu, Xin Li, Mark H. Engelhard, Zhenxing Feng, Scott P. Beckman, Xiaoqing Pan, Jin-Cheng Li, Dan Du, Yuehe Lin
Summary: The introduction of phosphorus into Fe-N-C single-atom catalysts enhances the peroxidase-like activity, showing excellent selectivity and stability. A 1D carbon nanowire catalyst with enriched Fe-N-4 active sites and phosphorus doping is designed and synthesized, and it is employed in an enzyme cascade platform for highly sensitive colorimetric detection of the neurotransmitter acetylcholine.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Zhun Dong, Ahmad Mukhtar, Thomas Ludwig, Sneha A. Akhade, ShinYoung Kang, Brandon Wood, Katarzyna Grubel, Mark Engelhard, Tom Autrey, Hongfei Lin
Summary: This study investigates the kinetics of surface-functionalized Pd on carbon catalysts for formate dehydrogenation and the impact of O-functional groups. The study shows that O-functional groups play critical roles in dispersing Pd nanoparticles and decreasing the activation energy, while C-O groups hinder the formation of metallic Pd.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Biochemistry & Molecular Biology
Ewa C. E. Ronnebro, Mark Engelhard, Danny Edwards, Katarzyna Grubel, Anthony Guzman, Randall Storms
Summary: The coating of metal specimens affects the hydrogen gettering performance. This study evaluated the role of post-plating heat treatments on gettering rates, surface composition, and texture. It was found that the pre-heat treatment in air before activation is necessary to avoid slower gettering rates.
Article
Chemistry, Physical
Donald R. Baer, John F. Watts, Alberto Herrera-Gomez, Karen J. Gaskell
Summary: Based on literature analysis, the use of X-ray photoelectron spectroscopy (XPS) has been increasing exponentially. However, there is a growing presence of significantly flawed data analyses, which is recognized as a problem within the surface analysis community. Efforts to address this issue include providing guides and protocols for non-experts, improving data and analysis reporting, and addressing peak fitting problems. Encouraging high-quality XPS analysis and reporting requires collaboration within the surface and interface analysis community.
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Hao Jia, Ju-Myung Kim, Peiyuan Gao, Yaobin Xu, Mark H. Engelhard, Bethany E. Matthews, Chongmin Wang, Wu Xu
Summary: This study systematically investigates and compares localized high-concentration electrolytes (LHCEs) based on five different solvents in lithium-ion batteries (LIBs). The unique solvation structure of LHCEs facilitates the formation of solid electrolyte interphase (SEI) on graphite anode, enabling previously incompatible solvents to achieve reversible lithiation/delithiation. The study also reveals that the long-term cyclability of LIBs can be improved by introducing additives into LHCEs, which results in effective SEIs and cathode electrolyte interphases (CEIs).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Konstantin Khivantsev, Nicholas R. Jaegers, Hristiyan A. Aleksandrov, Inhak Song, Xavier Isidro Pereira-Hernandez, Mark H. Engelhard, Jinshu Tian, Linxiao Chen, Debora Motta Meira, Libor Kovarik, Georgi N. Vayssilov, Yong Wang, Janos Szanyi
Summary: Atom trapping leads to catalysts with atomically dispersed Ru1O5 sites on (100) facets of ceria, showing excellent activity in catalytic NO oxidation and high NOx storage properties. The Ru1O5 sites exhibit higher stability during calcination and the Ru1/CeO2 catalyst is stable during continuous cycling and in the presence of moisture. In addition, the catalyst shows excellent reactivity for NO reduction by CO at low temperatures. This study highlights the applicability of novel ceria-based single-atom catalysts in NO and CO abatement.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Guangxia Feng, Hao Jia, Yaping Shi, Xu Yang, Yanliang Liang, Mark H. Engelhard, Ye Zhang, Chaojie Yang, Kang Xu, Yan Yao, Wu Xu, Xiaonan Shan
Summary: Reflection interference microscopy enables real-time imaging of the formation and evolution of the solid-electrolyte interphase in batteries, providing valuable insights into its structure and dynamics. The imaging reveals the stratified structure of the interphase, with an inner inorganic layer, an interfacial electrified double layer, and an outer organic-rich layer that is reversible with cycling. The thicknesses of the interphase subcomponents show an inverse correlation, indicating the influence of the inner layer on the formation of the outer layer and lithium nucleation.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Physical
Vanessa Lebarbier Dagle, Gregory Collinge, Mohammed Rahmana, Austin Winkelman, Wenda Hu, Jian Zhi Hu, Libor Kovarik, Mark Engelhard, Jennifer Jocz, Yong Wang, Mal-Soon Lee, Vassiliki-Alexandra Glezakou, Debmalya Ray, Roger Rousseau, Robert Dagle
Summary: This study reports on a Cu/ZrO2/SBA-16 catalyst with remarkable olefins selectivity and enhanced stability compared to the Ag/ZrO2/SBA-16 catalyst. Replacing Ag with Cu shifts the reaction pathway of crotonaldehyde hydrogenation, leading to the formation of butyraldehyde. Experimental and computational tools were used to verify the performance and stability advantage of the Cu/ZrO2/SBA-16 catalyst.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Multidisciplinary Sciences
Jianghao Zhang, Wenda Hu, Binbin Qian, Houqian Li, Berlin Sudduth, Mark Engelhard, Lian Zhang, Jianzhi Hu, Junming Sun, Changbin Zhang, Hong He, Yong Wang
Summary: In this study, the authors demonstrate that coordinating Pd with alkenyl-type ligands creates an electron-rich environment for selective hydrogenation. The method of forming homogeneous-like Pd catalyst structure with noble metals is crucial for inhibiting side reactions in hydrotreating processes.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Robert F. Hansen, Evan Z. Dalton, Rebecca B. Abney, Mark H. Engelhard, Gerardo Castillo Valdes, Sarah D. Burton, Rosalie K. Chu, Daniel P. Veghte, Swarup China, Yaroslav Losovyj, John B. Cliff, Jonathan D. Raff
Summary: Organicnitrate ester compounds (RONO2) act as sinks for nitrogen oxides (NO x & EQUIV;NO + NO2) and play a crucial role in the formation of ozone and organic aerosols in the lower atmosphere. This study investigates the production of RONO2 in organic aerosols through aqueous phase reactions involving nitronium (NO2 (+)) and humic and fulvic acids. The results provide evidence that NO2 (+) targets the lipid fraction of organic matter and forms stable RONO2 compounds through reactions with terminal alcohols (ROH) and alkenes.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Martin Weiser, Matthew J. Olszta, Mark H. Engelhard, Zihua Zhu, Daniel K. Schreiber
Summary: The transport paths of oxygen during intergranular oxidation in binary Ni-Cr were studied using electron microscopy, atom probe tomography (APT), secondary ion mass spectroscopy, and oxygen tracer exchange experiments. The selective oxidation of Cr was isolated by performing oxidation with a CO/CO2 gas mixture. The results reveal nanometer-scale details of passivation and penetrative intergranular oxidation processes, as well as preferred transport paths at the oxide/alloy interface.
NPJ MATERIALS DEGRADATION
(2023)
Article
Biophysics
Michael J. Taylor, Hoshin Kim, William Kew, Amity Andersen, Arunima Bhattacharjee, Mark H. Engelhard, Christopher R. Anderton
Summary: In beam-based ionization methods, the substrate plays a crucial role in the desorption mechanism of molecules from surfaces. Atomistic simulations combined with density functional theory calculations were used to study the desorption of a sphingolipid from a model surface. The results provide insights into the effects of biointerfacial lipid ordering on SIMS imaging.
Article
Chemistry, Multidisciplinary
Xia Cao, Yaobin Xu, Lianfeng Zou, Jie Bao, Yunxiang Chen, Bethany E. Matthews, Jiangtao Hu, Xinzi He, Mark H. Engelhard, Chaojiang Niu, Bruce W. Arey, Chunsheng Wang, Jie Xiao, Jun Liu, Chongmin Wang, Wu Xu, Ji-Guang Zhang
Summary: The calendar life of Lithium Metal Batteries (LMBs) can be significantly improved by forming a stable Solid Electrolyte Interphase (SEI) layer on the surface of Li metal anodes. The stability and reusability of this SEI during repeated lithium stripping/deposition processes have been studied using in situ electron microscopy. LMBs stored under fully charged or fully discharged conditions exhibit longer calendar life.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
