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Mu Y, Tran HH, Xiang Z, Majumder A, Hsu E, Steager E, Koo H, Lee D. Spiky Magnetic Microparticles Synthesized from Microrod-Stabilized Pickering Emulsion. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2402292. [PMID: 38864236 DOI: 10.1002/smll.202402292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 05/21/2024] [Indexed: 06/13/2024]
Abstract
Tailoring the microstructure of magnetic microparticles is of vital importance for their applications. Spiky magnetic particles, such as those made from sunflower pollens, have shown promise in single cell treatment and biofilm removal. Synthetic methods that can replicate or extend the functionality of such spiky particles would be advantageous for their widespread utilization. In this work, a wet-chemical method is introduced for spiky magnetic particles that are templated from microrod-stabilized Pickering emulsions. The spiky morphology is generated by the upright attachment of silica microrods at the oil-water interface of oil droplets. Spiky magnetic microparticles with control over the length of the spikes are obtained by dispersing hydrophobic magnetic nanoparticles in the oil phase and photopolymerizing the monomer. The spiky morphology dramatically enhances colloidal stability of these particles in high ionic strength solutions and physiologic media such as human saliva and saline-based biofilm suspension. To demonstrate their utility, the spiky magnetic particles are applied for magnetically controlled removal of oral biofilms and retrieval of bacteria for diagnostic sampling. This method expands the toolbox for engineering microparticle morphology and could promote the fabrication of functional magnetic microrobots.
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Affiliation(s)
- Yijiang Mu
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Hong-Huy Tran
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
- School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Zhenting Xiang
- School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Anirban Majumder
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Emery Hsu
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Edward Steager
- School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Hyun Koo
- School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA
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Chai Z. Heterogeneous Photocatalytic Strategies for C(sp 3 )-H Activation. Angew Chem Int Ed Engl 2024; 63:e202316444. [PMID: 38225893 DOI: 10.1002/anie.202316444] [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: 10/31/2023] [Revised: 01/12/2024] [Accepted: 01/15/2024] [Indexed: 01/17/2024]
Abstract
Activation of ubiquitous C(sp3 )-H bonds is extremely attractive but remains a great challenge. Heterogeneous photocatalysis offers a promising and sustainable approach for C(sp3 )-H activation and has been fast developing in the past decade. This Minireview focuses on mechanism and strategies for heterogeneous photocatalytic C(sp3 )-H activation. After introducing mechanistic insights, heterogeneous photocatalytic strategies for C(sp3 )-H activation including precise design of active sites, regulation of reactive radical species, improving charge separation and reactor innovations are discussed. In addition, recent advances in C(sp3 )-H activation of hydrocarbons, alcohols, ethers, amines and amides by heterogeneous photocatalysis are summarized. Lastly, challenges and opportunities are outlined to encourage more efforts for the development of this exciting and promising field.
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Affiliation(s)
- Zhigang Chai
- State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China
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Tao Y, Jiang W, Wang H, Hao W, Bi Q, Liu X, Fan J, Li G. Tuning electronic structure of hedgehog-like nickel cobaltite via molybdenum-doping for enhanced electrocatalytic oxygen evolution catalysis. J Colloid Interface Sci 2024; 657:921-930. [PMID: 38091915 DOI: 10.1016/j.jcis.2023.12.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 12/05/2023] [Accepted: 12/08/2023] [Indexed: 01/02/2024]
Abstract
As a typical spinel oxide, nickel cobaltite (NiCo2O4) is considered to be a promising and reliable oxygen evolution reaction (OER) catalyst due to its abundant oxidation states and the synergistic effect of multiple metal species. However, the electrocatalytic OER performance of NiCo2O4 has always been limited by the low specific surface area and poor intrinsic conductivity of spinels. Herein, the hedgehog-like molybdenum-doped NiCo2O4 (Mo-NiCo2O4) catalyst was prepared as an efficient OER electrocatalyst via a facile hydrothermal method followed with high-temperature annealing. The Mo-NiCo2O4-0.075 with Mo doping concentration of ∼ 1.95 wt% exhibits excellent OER performance with a low overpotential of 265 mV at a current density of 10 mA·cm-2and a Tafel slope of 126.63 mV·dec-1, as well as excellent cyclingstability.The results demonstrated that the hedgehog-like structure provides Mo-NiCo2O4 with the high surface area and mesopores that enhance electrolyte diffusion and optimal active site exposure. The in-situ Raman spectra and density functional theory calculations show that the Mo cations doping improve the intrinsic conductivity of the NiCo2O4 while modulating the chemisorption of intermediates. Meanwhile, the energy barriers of *OH and O* formation decrease significantly after Mo doping, effectively facilitating water dissociation and optimizing the reaction kinetics.
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Affiliation(s)
- Yinghao Tao
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Wendan Jiang
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Guangzhou, Guangdong 510006 PR China
| | - Hui Wang
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Weiju Hao
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Qingyuan Bi
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Xinjuan Liu
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China
| | - Jinchen Fan
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China.
| | - Guisheng Li
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, PR China
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Wang J, Ye B, Xiao S, Liu X. Engineering a hierarchically micro-/nanostructured Si@Au-based artificial enzyme with improved accessibility of active sites for enhanced catalysis. RSC Adv 2024; 14:2697-2703. [PMID: 38229716 PMCID: PMC10790278 DOI: 10.1039/d3ra07421h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 11/29/2023] [Indexed: 01/18/2024] Open
Abstract
The active site accessibility and high loading of gold nanoparticles (AuNPs) are key factors affecting the catalytic activity of supported AuNP-based catalysts. However, the preparation of supported AuNP-based catalysts with highly accessible active sites still remains a challenge. Herein, sphere-on-sphere (SoS) silica microspheres with a hierarchical structure, good dispersion and high surface density of thiol groups (10 SH nm-2) are prepared and used as a platform for the growth of high-density AuNPs. The obtained hierarchical Si@Au micro-/nanostructure consisting of 0.55 μm SoS silica microspheres and 7.3 nm AuNPs (SoS-0.55@Au-7.3) is found to show excellent peroxidase-mimicking activity (Km = 0.033 mM and Vmax = 34.6 × 10-8 M s-1) with merits of high stability and good reusability. Furthermore, the as-obtained SoS-0.55@Au-7.3-based system can sensitively detect hydrogen peroxide (H2O2) with a low detection limit of 1.6 μM and a wide linear range from 2.5 μM to 1.0 mM. The high catalytic activity, excellent stability and good reusability of SoS-0.55@Au-7.3 imply its great prospects in biosensing and biomedical analysis.
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Affiliation(s)
- Jian Wang
- School of Chemistry, Southwest Jiaotong University Chengdu 610031 China
| | - Bo Ye
- College of Life Science and Engineering, Southwest Jiaotong University Chengdu 610031 China
| | - Shiqi Xiao
- College of Life Science and Engineering, Southwest Jiaotong University Chengdu 610031 China
| | - Xia Liu
- School of Chemistry, Southwest Jiaotong University Chengdu 610031 China
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Tayebi M, Masoumi Z, Tayyebi A, Kim JH, Lee H, Seo B, Lim CS, Kim HG. Photoelectrochemical Epoxidation of Cyclohexene on an α-Fe 2O 3 Photoanode Using Water as the Oxygen Source. ACS APPLIED MATERIALS & INTERFACES 2023; 15:20053-20063. [PMID: 37040426 DOI: 10.1021/acsami.2c22603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
This study developed a safe and sustainable route for the epoxidation of cyclohexene using water as the source of oxygen at room temperature and ambient pressure. Here, we optimized the cyclohexene concentration, volume of solvent/water (CH3CN, H2O), time, and potential on the photoelectrochemical (PEC) cyclohexene oxidation reaction of the α-Fe2O3 photoanode. The α-Fe2O3 photoanode epoxidized cyclohexene to cyclohexene oxide with a 72.4 ± 3.6% yield and a 35.2 ± 1.6% Faradaic efficiency of 0.37 V vs Fc/Fc+ (0.8 VAg/AgCl) under 100 mW cm-2. Furthermore, the irradiation of light (PEC) decreased the applied voltage of the electrochemical cell oxidation process by 0.47 V. This work supplies an energy-saving and environment-benign approach for producing value-added chemicals coupled with solar fuel generation. Epoxidation with green solvents via PEC methods has a high potential for different oxidation reactions of value-added and fine chemicals.
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Affiliation(s)
- Meysam Tayebi
- Center for Advanced Specialty Chemicals, Division of Specialty and Bio-Based Chemicals Technology, Korea Research Institute of Chemical Technology (KRICT), 45 Jonggaro, Ulsan 44412, Republic of Korea
| | - Zohreh Masoumi
- Department of Civil and Environment Engineering, University of Ulsan, Daehakro 93, Namgu, Ulsan 44610, Republic of Korea
| | - Ahmad Tayyebi
- Department of Energy Engineering, School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea
| | - Jun-Hwan Kim
- Center for Advanced Specialty Chemicals, Division of Specialty and Bio-Based Chemicals Technology, Korea Research Institute of Chemical Technology (KRICT), 45 Jonggaro, Ulsan 44412, Republic of Korea
| | - Hyungwoo Lee
- Center for Advanced Specialty Chemicals, Division of Specialty and Bio-Based Chemicals Technology, Korea Research Institute of Chemical Technology (KRICT), 45 Jonggaro, Ulsan 44412, Republic of Korea
| | - Bongkuk Seo
- Center for Advanced Specialty Chemicals, Division of Specialty and Bio-Based Chemicals Technology, Korea Research Institute of Chemical Technology (KRICT), 45 Jonggaro, Ulsan 44412, Republic of Korea
| | - Choong-Sun Lim
- Center for Advanced Specialty Chemicals, Division of Specialty and Bio-Based Chemicals Technology, Korea Research Institute of Chemical Technology (KRICT), 45 Jonggaro, Ulsan 44412, Republic of Korea
| | - Hyeon-Gook Kim
- Center for Advanced Specialty Chemicals, Division of Specialty and Bio-Based Chemicals Technology, Korea Research Institute of Chemical Technology (KRICT), 45 Jonggaro, Ulsan 44412, Republic of Korea
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