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Asha A, Chamundeeswari M, Flora RMN, Preethy KR. Optimization of hematite nanoparticles from natural ore as novel imaging agents: A Green Chemistry approach. Biotechnol Appl Biochem 2024; 71:791-808. [PMID: 38486404 DOI: 10.1002/bab.2577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 02/25/2024] [Indexed: 08/09/2024]
Abstract
In this research, we propose an environmentally friendly method for producing hematite nanoparticles (H-NPs) from natural hematite ore, focusing on their application as efficient contrast agents in x-ray and computed tomography (CT) imaging for medical purposes. The process involves the reduction of iron oxide within the ore to attain the desired hematite phase, crucial for synthesizing H-NPs. To ensure sustainability, we adopted a Green Chemistry approach, utilizing a combination of carbon soot and limestone for the purification process, thereby achieving eco-conscious production. The produced H-NPs were thoroughly characterized using various analytical techniques, such as x-ray fluorescence (XRF), x-ray diffraction (XRD), Fourier transmission infrared spectroscopy (FT-IR), and FESEM-EDX (field emission scanning electron microscopy-energy-dispersive x-ray spectroscopy). XRD analysis confirmed the crystalline rhombohedral hexagonal lattice structure, while FT-IR spectra indicated the presence of characteristic Fe-O stretching modes in line with the expected molecular composition. FESEM-EDX imaging unveiled agglomerated particles, ranging in size from 54.6 to 149.9 nm for iron ore and 22 nm for H-NPs. These particles were primarily composed of iron (Fe) and oxygen (O). The magnetic properties of the H-NPs were investigated through vibrating sample magnetometer (VSM) studies, highlighting their distinct ferromagnetic behavior. Of particular significance, the H-NPs demonstrated exceptional performance as contrast agents in both x-ray and CT imaging. Even at minimal concentrations, they exhibited remarkable x-ray absorption capabilities. CT scans further validated their exceptional absorptive capacity. These findings emphasize the potential of H-NPs as valuable assets in medical imaging, serving as sustainable tools for enhanced diagnostic applications. The study showcases an eco-conscious approach to harnessing natural resources, paving the way for a greener and more effective utilization of H-NPs in the medical imaging landscape.
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Affiliation(s)
- Albert Asha
- Department of Physics, St. Joseph's Institute of Technology, Chennai, India
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Salah L, Makhseed S, Ghazal B, Abdel Nazeer A, Etherington MK, Ponseca CS, Li C, Monkman AP, Danos A, Shuaib A. Covalently linked pyrene antennas for optically dense yet aggregation-resistant light-harvesting systems. Phys Chem Chem Phys 2023; 25:24878-24882. [PMID: 37681234 DOI: 10.1039/d3cp02586a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
In this study we present a novel energy transfer material inspired by natural light-harvesting antenna arrays, zinc(II) phthalocyanine-pyrene (ZnPcPy). The ZnPcPy system facilitates energy transfer from 16 covalently linked pyrene (Py) donor chromophores to the emissive central zinc(II) phthalocyanine (ZnPc) core. Nearly 98% energy transfer efficiency is determined from the changes in emission decay rates between free MePy to covalently linked Py, supported by comparisons of photoluminescence quantum yields using different excitation wavelengths. A comparative analysis of ZnPcPy and an equivalent mixture of ZnPc and MePy demonstrates the superior light-harvesting performance of the covalently linked system, with energy transfer rates 9705 times higher in the covalently bound system. This covalent strategy allows for very high loadings of absorbing Py chromophores to be achieved while also avoiding exciton quenching that would otherwise arise, with the same strategy widely applicable to other pairs of Főrster resonance energy transfer (FRET) chromophores.
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Affiliation(s)
- Lubna Salah
- Department of Chemistry, Faculty of Science, Kuwait University, P. O. Box 5969, Safat 13060, Kuwait
| | - Saad Makhseed
- Department of Chemistry, Faculty of Science, Kuwait University, P. O. Box 5969, Safat 13060, Kuwait
| | - Basma Ghazal
- Organometallic and Organometalloid Chemistry Department, National Research Centre, Giza, Egypt
| | - Ahmed Abdel Nazeer
- Organometallic and Organometalloid Department, National Research Centre, Dokki, Cairo, 12622, Egypt
| | - Marc K Etherington
- Department of Mathematics, Physics & Electrical Engineering, Northumbria University, Ellison Place, Newcastle upon Tyne, NE1 8ST, UK
| | - Carlito S Ponseca
- Mathematics and Natural Science Department, Gulf University for Science and Technology, Kuwait
| | - Chunyong Li
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK.
| | - Andrew P Monkman
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK.
| | - Andrew Danos
- Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK.
| | - Ali Shuaib
- Biomedical Engineering Unit, Department of Physiology, Faculty of Medicine, Kuwait University, P. O. Box 24923, Safat 13110, Kuwait.
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Chang Y, Zhang Y, Hu T, Chen W, Tang T, Luo E, Jia J. Carbonaceous Material Modified MoO 2 Nanospheres with Oxygen Vacancies for Enhanced Visible-Light Photocatalytic Oxidative Coupling of Benzylamine. Molecules 2023; 28:4739. [PMID: 37375295 DOI: 10.3390/molecules28124739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 06/10/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023] Open
Abstract
Surface oxygen vacancy (OV) plays a pivotal role in the activation of molecular oxygen and separation of electrons and holes in photocatalysis. Herein, carbonaceous materials-modified MoO2 nanospheres with abundant surface OVs (MoO2/C-OV) were successfully synthesized via glucose hydrothermal processes. In situ introduction of carbonaceous materials triggered a reconstruction of the MoO2 surface, which introduced abundant surface OVs on the MoO2/C composites. The surface oxygen vacancies on the obtained MoO2/C-OV were confirmed via electron spin resonance spectroscopy (ESR) and X-ray photoelectron spectroscopy (XPS). The surface OVs and carbonaceous materials boosted the activation of molecular oxygen to singlet oxygen (1O2) and superoxide anion radical (•O2-) in selectively photocatalytic oxidation of benzylamine to imine. The conversion of benzylamine was 10 times that of pristine MoO2 nanospheres with a high selectivity under visible light irradiation at 1 atm air pressure. These results open an avenue to modify Mo-based materials for visible light-driven photocatalysis.
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Affiliation(s)
- Yuhong Chang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Yanxia Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Tianjun Hu
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Wenwen Chen
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Tao Tang
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Ergui Luo
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
| | - Jianfeng Jia
- Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science of Shanxi Normal University, Taiyuan 030032, China
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Xu J, Koh M, Minteer SD, Korzeniewski C. In Situ Confocal Raman Microscopy of Redox Polymer Films on Bulk Electrode Supports. ACS MEASUREMENT SCIENCE AU 2023; 3:127-133. [PMID: 37090254 PMCID: PMC10120033 DOI: 10.1021/acsmeasuresciau.2c00064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 05/03/2023]
Abstract
A spectroelectrochemical cell is described that enables confocal Raman microscopy studies of electrode-supported films. The confocal probe volume (∼1 μm3) was treated as a fixed-volume reservoir for the observation of potential-induced changes in chemical composition at microscopic locations within an ∼20 μm thickness layer of a redox polymer cast onto a 3 mm diameter carbon disk electrode. Using a Raman system with high collection efficiency and wavelength reproducibility, spectral subtraction achieved excellent rejection of background interferences, opening opportunities for measuring within micrometer-scale thickness redox films on widely available, low-cost, and conventional carbon disk electrodes. The cell performance and spectral difference technique are demonstrated in experiments that detect transformations of redox-active molecules exchanged into electrode-supported ionomer membranes. The in situ measurements were sensitive to changes in the film oxidation state and swelling/deswelling of the polymer framework in response to the uptake and discharge of charge-compensating electrolyte ions. The studies lay a foundation for confocal Raman microscopy as a quantitative in situ probe of processes within electrode-immobilized redox polymers under development for a range of applications, including electrosynthesis, energy conversion, and chemical sensing.
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Affiliation(s)
- Jiahe Xu
- Department
of Chemistry and Biochemistry, Texas Tech
University, Lubbock, Texas79409-1061, United States
| | - Miharu Koh
- Department
of Chemistry, University of Utah, Salt City, Utah84112, United States
| | - Shelley D. Minteer
- Department
of Chemistry, University of Utah, Salt City, Utah84112, United States
| | - Carol Korzeniewski
- Department
of Chemistry and Biochemistry, Texas Tech
University, Lubbock, Texas79409-1061, United States
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Wei Z, Ren Y, Wang P, Ma Y, Pan J. Polyethyleneimine functionalized crescent-shaped microgel templated by Janus emulsion for rapid eliminating lead from water. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Samajdar RN, Brown SA, Kairy SK, Robertson SD, Wain AJ. Methodologies for Operando ATR-IR Spectroscopy of Magnesium Battery Electrolytes. Anal Chem 2022; 94:14985-14993. [PMID: 36260706 DOI: 10.1021/acs.analchem.2c02843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We explore the suitability of operando attenuated total reflection infrared (ATR-IR) spectroscopy methodologies for the study of organoaluminate electrolytes for Mg battery applications. The "all-phenyl complex" in tetrahydrofuran (THF), with the molecular structure [Mg2Cl3·6THF]+[AlPh4]-, is used as an exemplar electrolyte to compare two different spectroelectrochemical cell configurations. In one case, a Pt gauze is used as a working electrode, while in the second case, a thin (∼10 nm) Pt film working electrode is deposited directly on the surface of the ATR crystal. Spectroscopic measurements indicate substantial differences in the ATR-IR response for the two configurations, reflecting the different spatial arrangements of the working electrode with respect to the ATR sampling volume. The relative merits and potential pitfalls associated with the two approaches are discussed.
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Affiliation(s)
- Rudra N Samajdar
- Department of Electromagnetic and Electrochemical Technologies, National Physical Laboratory, Teddington TW11 0LW, U.K.,WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - Scott A Brown
- Department of Electromagnetic and Electrochemical Technologies, National Physical Laboratory, Teddington TW11 0LW, U.K.,WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - Shravan K Kairy
- Department of Electromagnetic and Electrochemical Technologies, National Physical Laboratory, Teddington TW11 0LW, U.K
| | - Stuart D Robertson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, U.K
| | - Andrew J Wain
- Department of Electromagnetic and Electrochemical Technologies, National Physical Laboratory, Teddington TW11 0LW, U.K
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Abstract
Interpretation of impedance spectroscopy data requires both a description of the chemistry and physics that govern the system and an assessment of the error structure of the measurement. The approach presented here includes use of graphical methods to guide model development, use of a measurement model analysis to assess the presence of stochastic and bias errors, and a systematic development of interpretation models in terms of the proposed reaction mechanism and physical description. Application to corrosion, batteries, and biological systems is discussed, and emerging trends in interpretation and implementation of impedance spectroscopy are presented.
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Affiliation(s)
- Vincent Vivier
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface, 4 place Jussieu, Paris 75005 Cedex 05, France
| | - Mark E Orazem
- Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, United States
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