1
|
Hossain SM, Patnaik P, Sharma R, Sarkar S, Chatterjee U. Unveiling CeZnO x Bimetallic Oxide: A Promising Material to Develop Composite SPPO Membranes for Enhanced Oxidative Stability and Fuel Cell Performance. ACS APPLIED MATERIALS & INTERFACES 2024; 16:7097-7111. [PMID: 38296332 DOI: 10.1021/acsami.3c16113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
The incorporation of cerium-zinc bimetallic oxide (CeZnOx) nanostructures in sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) membranes holds promise in an enhanced and durable fuel cell performance. This investigation delves into the durability and efficiency of SPPO membranes intercalated with CeZnOx nanostructures by varying the filler loading of 1, 2, and 3% (w/w). The successful synthesis of CeZnOx nanostructures by the alkali-aided deposition method is confirmed by wide-angle X-ray diffraction spectroscopy (WAXS), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analyses. CeZnOx@SPPO nanocomposite membranes are fabricated using a solution casting method. The intricate interplay of interfacial adhesion and coupling configuration between three-dimensional CeZnOx and sulfonic moieties of the SPPO backbone yields an enhancement in the bound water content within the proton exchange membranes (PEMs). This constructs simultaneously an extensive hydrogen bonding network intertwined with the proton transport channels, thereby elevating the proton conductivity (Km). The orchestrated reversible redox cycling involving Ce3+/Ce4+ enhances the quenching of aggressive radicals, aided by Zn2+, promoting oxygen deficiency and Ce3+ concentration. This synergistic efficacy ultimately translates into composite PEMs characterized by a mere 4% mass loss and a nominal 6% decrease in Km after rigorous exposure to Fenton's solution. Remarkably, an improved power density of 403.2 mW/cm2 and a maximum current density of 1260.6 mA/cm2 were achieved with 2% loading of CeZnOx (SPZ-2) at 75 °C and 100% RH. The fuel cell performance of SPZ-2 is 74% higher than its corresponding pristine SPPO membrane.
Collapse
Affiliation(s)
- Sk Miraz Hossain
- Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pratyush Patnaik
- Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ritika Sharma
- Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Suman Sarkar
- Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Uma Chatterjee
- Membrane Science and Separation Technology Division, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| |
Collapse
|
2
|
Gupta DS, Kaur G, Bhushan S, Sak K, Garg VK, Aggarwal D, Joshi H, Kumar P, Yerer MB, Tuli HS. Phyto nanomedicine for cancer therapy. NANOTECHNOLOGY IN HERBAL MEDICINE 2023:313-347. [DOI: 10.1016/b978-0-323-99527-6.00007-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2024]
|
3
|
Escudero A, González-García L, Strahl R, Kang DJ, Drzic J, Kraus T. Large-Scale Synthesis of Hybrid Conductive Polymer-Gold Nanoparticles Using "Sacrificial" Weakly Binding Ligands for Printing Electronics. Inorg Chem 2021; 60:17103-17113. [PMID: 34735769 DOI: 10.1021/acs.inorgchem.1c02350] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe the gram-scale synthesis of hybrid gold nanoparticles with a shell of conductive polymers. A large-scale synthesis of hexadecyltrimethylammonium bromide (CTAB)-capped gold nanoparticles (AuNP@CTAB) was followed by ligand exchange with conductive polymers based on thiophene in a 10 L reactor equipped with a jacket to ensure a constant temperature of 40 °C and a mechanical stirrer. Slow and controlled reduction of the gold precursors and the presence of small amounts of silver nitrate are revealed to be the critical synthesis variables to obtain particles with a sufficiently narrow size distribution. Batches of approximately 10 g of faceted AuNP@CTAB with tunable average particle sizes from 54 to 85 nm were obtained per batch. Ligand exchange with poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) in the same reactor then yielded hybrid Au@PEDOT:PSS nanoparticles. They were used to formulate sinter-free inks for the inkjet printing of conductive structures without the need for a sintering step.
Collapse
Affiliation(s)
- Alberto Escudero
- INM─Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany.,Departamento de Química Inorgánica and Instituto de Investigaciones Químicas (IIQ), Universidad de Sevilla─CSIC, Calle Américo Vespucio 49, 41092 Seville, Spain
| | - Lola González-García
- INM─Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Robert Strahl
- INM─Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Dong Jin Kang
- INM─Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Juraj Drzic
- INM─Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany
| | - Tobias Kraus
- INM─Leibniz Institute for New Materials, Campus D2 2, 66123 Saarbrücken, Germany.,Colloid and Interface Chemistry, Saarland University, 66123 Saarbrücken, Germany
| |
Collapse
|
4
|
Dev Sarkar R, Singh HB, Chandra Kalita M. Enhanced lipid accumulation in microalgae through nanoparticle-mediated approach, for biodiesel production: A mini-review. Heliyon 2021; 7:e08057. [PMID: 34622062 PMCID: PMC8481968 DOI: 10.1016/j.heliyon.2021.e08057] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 07/02/2021] [Accepted: 09/20/2021] [Indexed: 12/11/2022] Open
Abstract
Nanoparticle application in microalgae for enhanced lipid production is an ongoing work that leads towards the contribution in biodiesel production. During this decade, metal nanoparticles are constantly being reported to have numerous applications in diverse fields, because of their unique optical, electrical, and magnetic properties. They can interact with the biomolecules of cells and thereby alters cellular metabolisms, which in turn reflects their ability to regulate some primary or secondary metabolic pathways. Nanoparticles derived from metals like Fe, Cu, and Se are taking part in redox processes and their presence in many enzymes may modulate algal metabolisms. Besides by upregulating or downregulating the expression of several genes, nanoparticle exposure can alter gene expressions in many organisms. In microalgae such as Chlorella vulgaris, C. pyrenoidosa, Scenedesmus obliquus, S. rubescens, Trachydiscus minut u s, Parachlorella kessleri, and Tetraselmis suecica; metal nanoparticle exposure in different environmental conditions have impacts on various physiological or molecular changes, thereby increasing the growth rate, biomass and lipid production. The present mini-review gives an insight into the various advantages and a future outlook on the application of nanoparticles in microalgae for biofuel production. Also, it can be proposed that nanoparticles could be useful in blocking or deactivating the AGPase enzyme (involved in the glucose to starch conversion pathway), binding to its active site, thereby increasing lipid production in microalgae that could be utilized for enhanced biodiesel production.
Collapse
|
5
|
Scale-up of green synthesis and characterization of silver nanoparticles using ethanol extract of Plantago major L. leaf and its antibacterial potential. SOUTH AFRICAN JOURNAL OF CHEMICAL ENGINEERING 2021. [DOI: 10.1016/j.sajce.2021.06.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
|
6
|
Lin CY, Chen YY, Chen PY, Chen MC, Su TF, Chiang YY. Scale-out production in core-annular liquid–liquid microextractor. J Flow Chem 2021. [DOI: 10.1007/s41981-021-00153-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
7
|
Abstract
We review the solution-based synthesis routes to cerium oxide materials where one or more elements are included in place of a proportion of the cerium, i.e., substitution of cerium is performed. The focus is on the solvothermal method, where reagents are heated above the boiling point of the solvent to induce crystallisation directly from the solution. This yields unusual compositions with crystal morphology often on the nanoscale. Chemical elements from all parts of the periodic table are considered, from transition metals to main group elements and the rare earths, including isovalent and aliovalent cations, and surveyed using the literature published in the past ten years. We illustrate the versatility of this synthesis method to allow the formation of functional materials with applications in contemporary applications such as heterogeneous catalysis, electrodes for solid oxide fuel cells, photocatalysis, luminescence and biomedicine. We pick out emerging trends towards control of crystal habit by use of non-aqueous solvents and solution additives and identify challenges still remaining, including in detailed structural characterisation, the understanding of crystallisation mechanisms and the scale-up of synthesis.
Collapse
|
8
|
Quesada-Cabrera R, Parkin IP. Qualitative Approaches Towards Useful Photocatalytic Materials. Front Chem 2020; 8:817. [PMID: 33024744 PMCID: PMC7516336 DOI: 10.3389/fchem.2020.00817] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 08/04/2020] [Indexed: 11/13/2022] Open
Abstract
The long-standing crusade searching for efficient photocatalytic materials has resulted in a vast landscape of promising photocatalysts, as reflected by the number of reviews reported in the last decade. Virtually all of these reviews have focused on quantitative approaches aiming at developing an understanding of the underlying mechanisms behind photocatalytic behavior and the parameters that influence structure–function correlation. Less attention has been paid, however, to qualitative measures around the development and assessment of photocatalysts. These measures will contribute toward narrowing the range of potential photocatalytic materials for widespread applications. The current report provides a critical perspective over some of the main factors affecting the assessment of photocatalytic materials as a code of good practice. A case of study is also provided, where this qualitative analysis is applied to one of the most prolific materials of the last-decade, disorder-engineered, black titanium dioxide (TiO2).
Collapse
Affiliation(s)
- Raul Quesada-Cabrera
- Christopher-Ingold Laboratories, Materials Chemistry Center, Department of Chemistry, UCL (University College London), London, United Kingdom
| | - Ivan P Parkin
- Christopher-Ingold Laboratories, Materials Chemistry Center, Department of Chemistry, UCL (University College London), London, United Kingdom
| |
Collapse
|
9
|
Wong PM, Juan JC, Lai JC, Lim TH. Galvanic Replacement-Enabled Synthesis of In(OH) 3/Ag/C Nanocomposite as an Effective Photocatalyst for Ultraviolet C Degradation of Methylene Blue. ACS OMEGA 2020; 5:13719-13728. [PMID: 32566837 PMCID: PMC7301362 DOI: 10.1021/acsomega.0c00881] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 05/21/2020] [Indexed: 06/11/2023]
Abstract
Sub-10 nm indium metal nanoparticles (In NPs) stabilized on conductive carbon were reacted with silver nitrate in dark conditions in water at room temperature in a galvanic replacement manner to produce an indium hydroxide/silver/carbon nanocomposite (In(OH)3/Ag/C). The chosen carbon imparted colloidal stability, high surface area, and water dispersibility suitable for photodegradation of harmful dyes in water. The size and shape of indium hydroxide and silver nanoparticles produced were found to be 6.6 ± 0.9 nm, similar to that of the In NPs that were started with. The nanocomposite was characterized by transmission electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and thermogravimetric analysis. The galvanic reaction between In NPs and silver nitrate was tracked with UV-vis spectroscopy in a control experiment without a carbon substrate to confirm that the reaction was indeed thermodynamically spontaneous as indicated by the positive electromotive force (EMF) of +1.14 V calculated for In/Ag+ redox couple. The photocatalytic performance of the nanocomposite was evaluated to be approximately 90% under UVC radiation when 10 ppm of methylene blue and 13 wt % of indium hydroxide/silver loading on carbon were used.
Collapse
Affiliation(s)
- Pui Munn Wong
- Department
of Physical Science, Faculty of Applied Sciences, Tunku Abdul Rahman University College, Jalan Genting Kelang, Setapak, Kuala Lumpur 53300, Malaysia
| | - Joon Ching Juan
- Nanotechnology
& Catalysis Research Centre (NANOCAT), Level 3, IPS Building, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Jau Choy Lai
- Department
of Bioprocess and Polymer Engineering, School of Chemical & Energy
Engineering, Universiti Teknologi Malaysia, Skudai 81310, Malaysia
| | - Teck Hock Lim
- Department
of Physical Science, Faculty of Applied Sciences, Tunku Abdul Rahman University College, Jalan Genting Kelang, Setapak, Kuala Lumpur 53300, Malaysia
| |
Collapse
|
10
|
Xu Y, Sumboja A, Zong Y, Darr JA. Bifunctionally active nanosized spinel cobalt nickel sulfides for sustainable secondary zinc–air batteries: examining the effects of compositional tuning on OER and ORR activity. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02185j] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanosized cobalt nickel sulfides were prepared via a continuous hydrothermal method and evaluated as electrocatalysts, with the catalytic activity being linked to the cationic composition.
Collapse
Affiliation(s)
- Yijie Xu
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
- Institute of Materials Research and Engineering (IMRE)
| | - Afriyanti Sumboja
- Material Science and Engineering Research Group
- Faculty of Mechanical and Aerospace Engineering
- Institut Teknologi Bandung
- Bandung 40132
- Indonesia
| | - Yun Zong
- Institute of Materials Research and Engineering (IMRE)
- A*STAR (Agency for Science, Technology and Research)
- Singapore
| | - Jawwad A. Darr
- Department of Chemistry
- University College London
- London WC1H 0AJ
- UK
| |
Collapse
|
11
|
Chen Y, Tang Q, Ye Z, Li Y, Yang Y, Pu H, Li G. Monolithic Zn xCe 1−xO 2 catalysts for catalytic synthesis of dimethyl carbonate from CO 2 and methanol. NEW J CHEM 2020. [DOI: 10.1039/d0nj02650f] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The schematic diagram of reactor module comprised of honeycomb ceramic monolith with the catalysts for the synthesis of DMC.
Collapse
Affiliation(s)
- Yongdong Chen
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu 610500
- China
| | - Qiang Tang
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu 610500
- China
| | - Zhongbin Ye
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu 610500
- China
| | - Yue Li
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu 610500
- China
| | - You Yang
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu 610500
- China
| | - Haoyu Pu
- College of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu 610500
- China
| | - Gao Li
- State Key Laboratory of Catalysis
- Dalian Institute of Chemical Physics
- Chinese Academy of Sciences
- Dalian 116023
- China
| |
Collapse
|
12
|
Długosz O, Banach M. Inorganic nanoparticle synthesis in flow reactors – applications and future directions. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00188k] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The use of flow technologies for obtaining nanoparticles can play an important role in the development of ecological and sustainable processes for obtaining inorganic nanomaterials, and the continuous methods are part of the Flow Chemistry trend.
Collapse
Affiliation(s)
- Olga Długosz
- Faculty of Chemical Engineering and Technology
- Institute of Chemistry and Inorganic Technology
- Cracow University of Technology
- Cracow 31-155
- Poland
| | - Marcin Banach
- Faculty of Chemical Engineering and Technology
- Institute of Chemistry and Inorganic Technology
- Cracow University of Technology
- Cracow 31-155
- Poland
| |
Collapse
|
13
|
Coupling of $$\hbox {CH}_{3}$$OH and $$\hbox {CO}_{2}$$ with 2-cyanopyridine for enhanced yields of dimethyl carbonate over $$\text {ZnO}$$–$$\text {CeO}_{2}$$ catalyst. J CHEM SCI 2019. [DOI: 10.1007/s12039-019-1651-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
14
|
Xu Y, Musumeci V, Aymonier C. Chemistry in supercritical fluids for the synthesis of metal nanomaterials. REACT CHEM ENG 2019. [DOI: 10.1039/c9re00290a] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The supercritical flow synthesis of metal nanomaterials is sustainable and scalable for the efficient production of materials.
Collapse
Affiliation(s)
- Yu Xu
- CNRS
- Univ. Bordeaux
- 33600 Pessac
- France
| | | | | |
Collapse
|
15
|
Darr JA, Zhang J, Makwana NM, Weng X. Continuous Hydrothermal Synthesis of Inorganic Nanoparticles: Applications and Future Directions. Chem Rev 2017; 117:11125-11238. [PMID: 28771006 DOI: 10.1021/acs.chemrev.6b00417] [Citation(s) in RCA: 291] [Impact Index Per Article: 41.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nanomaterials are at the leading edge of the emerging field of nanotechnology. Their unique and tunable size-dependent properties (in the range 1-100 nm) make these materials indispensable in many modern technological applications. In this Review, we summarize the state-of-art in the manufacture and applications of inorganic nanoparticles made using continuous hydrothermal flow synthesis (CHFS) processes. First, we introduce ideal requirements of any flow process for nanoceramics production, outline different approaches to CHFS, and introduce the pertinent properties of supercritical water and issues around mixing in flow, to generate nanoparticles. This Review then gives comprehensive coverage of the current application space for CHFS-made nanomaterials including optical, healthcare, electronics (including sensors, information, and communication technologies), catalysis, devices (including energy harvesting/conversion/fuels), and energy storage applications. Thereafter, topics of precursor chemistry and products, as well as materials or structures, are discussed (surface-functionalized hybrids, nanocomposites, nanograined coatings and monoliths, and metal-organic frameworks). Later, this Review focuses on some of the key apparatus innovations in the field, such as in situ flow/rapid heating systems (to investigate kinetics and mechanisms), approaches to high throughput flow syntheses (for nanomaterials discovery), as well as recent developments in scale-up of hydrothermal flow processes. Finally, this Review covers environmental considerations, future directions and capabilities, along with the conclusions and outlook.
Collapse
Affiliation(s)
- Jawwad A Darr
- Department of Chemistry, University College London, Christopher Ingold Laboratories , 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Jingyi Zhang
- Department of Environmental & Resource Sciences, Zhejiang University , 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, People's Republic of China
| | - Neel M Makwana
- Department of Chemistry, University College London, Christopher Ingold Laboratories , 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Xiaole Weng
- Department of Environmental & Resource Sciences, Zhejiang University , 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, People's Republic of China
| |
Collapse
|
16
|
Kinoshita K, Takano Y, Ohkouchi N, Deguchi S. Free-Radical Polymerization of Acrylic Acid under Extreme Reaction Conditions Mimicking Deep-Sea Hydrothermal Vents. ACS OMEGA 2017; 2:2765-2769. [PMID: 31457614 PMCID: PMC6641060 DOI: 10.1021/acsomega.7b00293] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 05/26/2017] [Indexed: 06/10/2023]
Abstract
Free-radical polymerization with a thermochemical initiator, which usually takes hours to complete, was dramatically accelerated under reaction conditions mimicking the deep-sea hydrothermal vents, where reaction mixtures were only briefly exposed to ultrahigh temperatures under pressure. In tests using acrylic acid and potassium persulfate, poly(acrylic acid) (M n = 2.1 × 104, Đ = 2.73) was obtained in 5.2 s with the monomer conversion of 60.3% in water at 200 °C and 25 MPa without using any catalysts. The process that we call heat-shock-induced polymerization may pave the way for an entirely new strategy in reaction engineering for developing extremely fast, green, and scalable processes for polymer synthesis.
Collapse
Affiliation(s)
- Keigo Kinoshita
- Research
and Development Center for Marine Biosciences and Department of
Biogeochemistry, Japan Agency for Marine-Earth
Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
| | - Yoshinori Takano
- Research
and Development Center for Marine Biosciences and Department of
Biogeochemistry, Japan Agency for Marine-Earth
Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
| | - Naohiko Ohkouchi
- Research
and Development Center for Marine Biosciences and Department of
Biogeochemistry, Japan Agency for Marine-Earth
Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
| | - Shigeru Deguchi
- Research
and Development Center for Marine Biosciences and Department of
Biogeochemistry, Japan Agency for Marine-Earth
Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
| |
Collapse
|
17
|
Bauer D, Roberts AJ, Matsumi N, Darr JA. Nano-sized Mo- and Nb-doped TiO 2 as anode materials for high energy and high power hybrid Li-ion capacitors. NANOTECHNOLOGY 2017; 28:195403. [PMID: 28352001 DOI: 10.1088/1361-6528/aa69df] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nano-sized Mo-doped titania (Mo0.1Ti0.9O2) and Nb-doped titania (Nb0.25Ti0.75O2) were directly synthesized via a continuous hydrothermal flow synthesis process. Materials characterization was conducted using physical techniques such as transmission electron microscopy, powder x-ray diffraction, x-ray photoelectron spectroscopy, Brunauer-Emmett-Teller specific surface area measurements and energy dispersive x-ray spectroscopy. Hybrid Li-ion supercapacitors were made with either a Mo-doped or Nb-doped TiO2 negative electrode material and an activated carbon (AC) positive electrode. Cells were evaluated using electrochemical testing (cyclic voltammetry, constant charge discharge cycling). The hybrid Li-ion capacitors showed good energy densities at moderate power densities. When cycled in the potential window 0.5-3.0 V, the Mo0.1Ti0.9O2/AC hybrid supercapacitor showed the highest energy densities of 51 Wh kg-1 at a power of 180 W kg-1 with energy densities rapidly declining with increasing applied specific current. In comparison, the Nb0.25Ti0.75O2/AC hybrid supercapacitor maintained its energy density of 45 Wh kg-1 at 180 W kg-1 better, showing 36 Wh g-1 at 3200 W kg-1, which is a very promising mix of high energy and power densities. Reducing the voltage window to the range 1.0-3.0 V led to an increase in power density, with the Mo0.1Ti0.9O2/AC hybrid supercapacitor giving energy densities of 12 Wh kg-1 and 2.5 Wh kg-1 at power densities of 6700 W kg-1 and 14 000 W kg-1, respectively.
Collapse
Affiliation(s)
- Dustin Bauer
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom. School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, 923-1211 Nomi, Ishikawa, Japan
| | | | | | | |
Collapse
|
18
|
|
19
|
Kellici S, Acord J, Power NP, Morgan DJ, Coppo P, Heil T, Saha B. Rapid synthesis of graphene quantum dots using a continuous hydrothermal flow synthesis approach. RSC Adv 2017. [DOI: 10.1039/c7ra00127d] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A rapid and environmentally benign synthesis of green fluorescent graphene quantum dots (GQD) with low cytotoxicity via Continuous Hydrothermal Flow Synthesis (CHFS) aided by calix[4]arene tetrasulfonic acid (SCX4) as a particle size limiting agent.
Collapse
Affiliation(s)
- Suela Kellici
- School of Engineering
- London South Bank University
- London
- UK
| | - John Acord
- School of Applied Sciences
- London South Bank University
- London
- UK
| | - Nicholas P. Power
- School of Life Health & Chemical Sciences
- Open University
- Milton Keynes
- UK
| | - David J. Morgan
- Cardiff Catalysis Institute
- School of Chemistry
- Cardiff University
- Cardiff
- UK
| | - Paolo Coppo
- Centre for Phosphors and Display Materials
- The Wolfson Centre
- Brunel University
- Uxbridge
- UK
| | - Tobias Heil
- Nanoinvestigation Centre at Liverpool
- Liverpool University
- Liverpool
- UK
| | - Basudeb Saha
- School of Engineering
- London South Bank University
- London
- UK
| |
Collapse
|
20
|
Mrad K, Schoenstein F, Nong HTT, Anagnostopoulou E, Viola A, Mouton L, Mercone S, Ricolleau C, Jouini N, Abderraba M, Lacroix LM, Viau G, Piquemal JY. Control of the crystal habit and magnetic properties of Co nanoparticles through the stirring rate. CrystEngComm 2017. [DOI: 10.1039/c7ce00714k] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
21
|
Tripathi VK, Nagarajan R. Sol-Gel Synthesis of High-Purity Actinide Oxide ThO 2 and Its Solid Solutions with Technologically Important Tin and Zinc Ions. Inorg Chem 2016; 55:12798-12806. [PMID: 27989197 DOI: 10.1021/acs.inorgchem.6b02086] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The applicability of epoxide-based sol-gel synthesis for actinide oxide (thoria) starting from air-stable salt, Th(NO3)4, has been examined. The homogeneous gel formed from Th(NO3)4 when calcined at 400 °C yielded nanostructured thoria, and with increasing tempeartures (600, 700, and 800 °C), the average crystallite size increased. Successful Rietveld refinement of the powder X-ray diffraction pattern of ThO2 in Fm3̅m space group was carried out with a = 5.6030(35) Å. The fingerprint vibrational mode of the fluorite structure of ThO2 was noticed as a sharp band in the Raman spectrum at 457 cm-1. In the SEM image, a near spherical morphology of thoria was noticed. Samples showed blue emission on exciting with λ = 380 nm in the photoluminescence spectrum indicative of the presence of defects. Following this approach, 50 mol % of Sn4+ could be substituted for Th4+, retaining the fluorite structure as evidenced by the PXRD, Raman spectroscopy, electron microscopy, EDAX, and XPS measurements. Randomization of the lattice was observed for the tin-substituted samples. A significant blue shift in the absorption threshold along with a persistent blue emission in the photoluminesence spectra were evident for the tin-substituted samples. The concentration of Zn2+ ion in thoria was limited to 15 mol % as revealed by PXRD and XPS measurements. The Raman peak shifted to higher values for Zn2+-substituted samples. A change in the optical absorbance characteristics was observed for the zinc-substituted thoria. A 50 mol % Sn4+-substituted thoria degraded aqueous Rhodamine 6G dye solutions in the presence of UV-vis radiation following pseudo-first-order kinetics.
Collapse
Affiliation(s)
- Vikash Kumar Tripathi
- Materials Chemistry Group, Department of Chemistry, University of Delhi , Delhi 110007, India
| | - Rajamani Nagarajan
- Materials Chemistry Group, Department of Chemistry, University of Delhi , Delhi 110007, India
| |
Collapse
|
22
|
Loveridge MJ, Lain MJ, Johnson ID, Roberts A, Beattie SD, Dashwood R, Darr JA, Bhagat R. Towards High Capacity Li-ion Batteries Based on Silicon-Graphene Composite Anodes and Sub-micron V-doped LiFePO 4 Cathodes. Sci Rep 2016; 6:37787. [PMID: 27898104 PMCID: PMC5127186 DOI: 10.1038/srep37787] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 11/02/2016] [Indexed: 11/13/2022] Open
Abstract
Lithium iron phosphate, LiFePO4 (LFP) has demonstrated promising performance as a cathode material in lithium ion batteries (LIBs), by overcoming the rate performance issues from limited electronic conductivity. Nano-sized vanadium-doped LFP (V-LFP) was synthesized using a continuous hydrothermal process using supercritical water as a reagent. The atomic % of dopant determined the particle shape. 5 at. % gave mixed plate and rod-like morphology, showing optimal electrochemical performance and good rate properties vs. Li. Specific capacities of >160 mAh g−1 were achieved. In order to increase the capacity of a full cell, V-LFP was cycled against an inexpensive micron-sized metallurgical grade Si-containing anode. This electrode was capable of reversible capacities of approximately 2000 mAh g−1 for over 150 cycles vs. Li, with improved performance resulting from the incorporation of few layer graphene (FLG) to enhance conductivity, tensile behaviour and thus, the composite stability. The cathode material synthesis and electrode formulation are scalable, inexpensive and are suitable for the fabrication of larger format cells suited to grid and transport applications.
Collapse
Affiliation(s)
| | - M J Lain
- Warwick University, Coventry, CV4 7AL, UK
| | | | - A Roberts
- Warwick University, Coventry, CV4 7AL, UK
| | | | - R Dashwood
- Coventry University, Coventry, CV1 5FB, UK
| | - J A Darr
- University College, London, WC1E 6BT, UK
| | - R Bhagat
- Warwick University, Coventry, CV4 7AL, UK
| |
Collapse
|
23
|
Bersani M, Gupta K, Mishra AK, Lanza R, Taylor SFR, Islam HU, Hollingsworth N, Hardacre C, de Leeuw NH, Darr JA. Combined EXAFS, XRD, DRIFTS, and DFT Study of Nano Copper-Based Catalysts for CO2 Hydrogenation. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01529] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marco Bersani
- Department
of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Kalyani Gupta
- Department
of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Abhishek Kumar Mishra
- Department
of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Roberto Lanza
- Department
of Chemical Engineering and Technology, KTH-Royal Institute of Technology, Teknikringen 42, 100 44 Stockholm, Sweden
| | - S. F. Rebecca Taylor
- School
of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Husn-Ubayda Islam
- School
of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Nathan Hollingsworth
- Department
of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Christopher Hardacre
- School
of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Nora H. de Leeuw
- Department
of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
- School
of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, U.K
| | - Jawwad A. Darr
- Department
of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| |
Collapse
|
24
|
Kellici S, Acord J, Vaughn A, Power NP, Morgan DJ, Heil T, Facq SP, Lampronti GI. Calixarene Assisted Rapid Synthesis of Silver-Graphene Nanocomposites with Enhanced Antibacterial Activity. ACS APPLIED MATERIALS & INTERFACES 2016; 8:19038-46. [PMID: 27378104 DOI: 10.1021/acsami.6b06052] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Demonstrated herein is a single rapid approach employed for synthesis of Ag-graphene nanocomposites, with excellent antibacterial properties and low cytotoxicity, by utilizing a continuous hydrothermal flow synthesis (CHFS) process in combination with p-hexasulfonic acid calix[6]arene (SCX6) as an effective particle stabilizer. The nanocomposites showed high activity against E. coli (Gram-negative) and S. aureus (Gram-positive) bacteria. The materials were characterized using a range of techniques including transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, UV-vis spectrophotometry, FT-IR, and X-ray powder diffraction (XRD). This rapid, single step synthetic approach not only provides a facile means of enabling and controlling graphene reduction (under alkaline conditions) but also offers an optimal route for homogeneously producing and depositing highly crystalline Ag nanostructures into reduced graphene oxide substrate.
Collapse
Affiliation(s)
- Suela Kellici
- School of Engineering, London South Bank University , 103 Borough Road, London SE1 0AA, United Kingdom
| | - John Acord
- School of Applied Sciences, London South Bank University , 103 Borough Road, London SE1 0AA, United Kingdom
| | - Arni Vaughn
- School of Engineering, London South Bank University , 103 Borough Road, London SE1 0AA, United Kingdom
| | - Nicholas P Power
- School of Applied Sciences, London South Bank University , 103 Borough Road, London SE1 0AA, United Kingdom
| | - David J Morgan
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University , Park Place, Cardiff CF10 3AT, United Kingdom
| | - Tobias Heil
- Nanoinvestigation Centre at Liverpool, Liverpool University , 1-3 Brownlow Street, Liverpool L69 3GL, United Kingdom
| | - Sébastien P Facq
- Department of Earth Sciences, University of Cambridge , Downing Street, Cambridge CB2 3EQ, United Kingdom
| | - Giulio I Lampronti
- Department of Earth Sciences, University of Cambridge , Downing Street, Cambridge CB2 3EQ, United Kingdom
| |
Collapse
|
25
|
Lübke M, Ding N, Powell MJ, Brett DJ, Shearing PR, Liu Z, Darr JA. VO2 nano-sheet negative electrodes for lithium-ion batteries. Electrochem commun 2016. [DOI: 10.1016/j.elecom.2016.01.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
26
|
Marchand P, Makwana NM, Tighe CJ, Gruar RI, Parkin IP, Carmalt CJ, Darr JA. High-Throughput Synthesis, Screening, and Scale-Up of Optimized Conducting Indium Tin Oxides. ACS COMBINATORIAL SCIENCE 2016; 18:130-7. [PMID: 26798986 DOI: 10.1021/acscombsci.5b00166] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A high-throughput optimization and subsequent scale-up methodology has been used for the synthesis of conductive tin-doped indium oxide (known as ITO) nanoparticles. ITO nanoparticles with up to 12 at % Sn were synthesized using a laboratory scale (15 g/hour by dry mass) continuous hydrothermal synthesis process, and the as-synthesized powders were characterized by powder X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray analysis, and X-ray photoelectron spectroscopy. Under standard synthetic conditions, either the cubic In2O3 phase, or a mixture of InO(OH) and In2O3 phases were observed in the as-synthesized materials. These materials were pressed into compacts and heat-treated in an inert atmosphere, and their electrical resistivities were then measured using the Van der Pauw method. Sn doping yielded resistivities of ∼ 10(-2) Ω cm for most samples with the lowest resistivity of 6.0 × 10(-3) Ω cm (exceptionally conductive for such pressed nanopowders) at a Sn concentration of 10 at %. Thereafter, the optimized lab-scale composition was scaled-up using a pilot-scale continuous hydrothermal synthesis process (at a rate of 100 g/hour by dry mass), and a comparable resistivity of 9.4 × 10(-3) Ω cm was obtained. The use of the synthesized TCO nanomaterials for thin film fabrication was finally demonstrated by deposition of a transparent, conductive film using a simple spin-coating process.
Collapse
Affiliation(s)
- Peter Marchand
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Neel M. Makwana
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Christopher J. Tighe
- Department
of Chemical Engineering, Imperial College London, South Kensington
Campus, London, SW7 2AZ, United Kingdom
| | - Robert I. Gruar
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Ivan P. Parkin
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Claire J. Carmalt
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Jawwad A. Darr
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom
| |
Collapse
|
27
|
Lübke M, Sumboja A, Johnson ID, Brett DJ, Shearing PR, Liu Z, Darr JA. High power nano-Nb2O5 negative electrodes for lithium-ion batteries. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.01.226] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
28
|
Golmohammadi M, Towfighi J, Hosseinpour M, Ahmadi SJ. An investigation into the formation and conversion of metal complexes to metal oxide nanoparticles in supercritical water. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2015.07.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
29
|
Powell MJ, Marchand P, Denis CJ, Bear JC, Darr JA, Parkin IP. Direct and continuous synthesis of VO2 nanoparticles. NANOSCALE 2015; 7:18686-18693. [PMID: 26497868 DOI: 10.1039/c5nr04444h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Monoclinic VO2 nanoparticles are of interest due to the material's thermochromic properties, however, direct synthesis routes to VO2 nanoparticles are often inaccessible due to the high synthesis temperatures or long reaction times required. Herein, we present a two-step synthesis route for the preparation of monoclinic VO2 nanoparticles using Continuous Hydrothermal Flow Synthesis (CHFS) followed by a short post heat treatment step. A range of particle sizes, dependent on synthesis conditions, were produced from 50 to 200 nm by varying reaction temperatures and the residence times in the process. The nanoparticles were characterised by powder X-ray diffraction, Raman and UV/Vis spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The nanoparticles were highly crystalline with rod and sphere-like morphologies present in TEM micrographs, with the size of both the rod and spherical particles being highly dependent on both reaction temperature and residence time. SEM micrographs showed the surface of the powders produced from the CHFS process to be highly uniform. The samples were given a short post synthesis heat treatment to ensure that they were phase pure monoclinic VO2, which led to them exhibiting a large and reversible switch in optical properties (at near-IR wavelengths), which suggests that if such materials can be incorporated into coatings or in composites, they could be used for fenestration in architectural applications.
Collapse
Affiliation(s)
- M J Powell
- University College London, Department of Chemistry, Materials Chemistry Centre, 20 Gordon Street, London, WC1H 0AJ, UK.
| | | | | | | | | | | |
Collapse
|
30
|
Carbó-Argibay E, Bao XQ, Rodríguez-Abreu C, Fátima Cerqueira M, Petrovykh DY, Liu L, Kolen’ko YV. Up-scaling the synthesis of Cu2O submicron particles with controlled morphologies for solar H2 evolution from water. J Colloid Interface Sci 2015; 456:219-27. [DOI: 10.1016/j.jcis.2015.06.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 06/08/2015] [Accepted: 06/11/2015] [Indexed: 10/23/2022]
|
31
|
Gruar RI, Tighe CJ, Southern P, Pankhurst QA, Darr JA. A Direct and Continuous Supercritical Water Process for the Synthesis of Surface-Functionalized Nanoparticles. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01817] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert I. Gruar
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Christopher J. Tighe
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| | - Paul Southern
- UCL
Healthcare Biomagnetics Laboratory, University College London, 21 Albemarle
Street, London W1S 4BS, U.K
- Institute
of Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, U.K
| | - Quentin A. Pankhurst
- UCL
Healthcare Biomagnetics Laboratory, University College London, 21 Albemarle
Street, London W1S 4BS, U.K
- Institute
of Biomedical Engineering, University College London, Gower Street, London WC1E 6BT, U.K
| | - Jawwad A. Darr
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K
| |
Collapse
|
32
|
Ruiz-Trejo E, Boldrin P, Medley-Hallam J, Darr J, Atkinson A, Brandon N. Partial oxidation of methane using silver/gadolinia-doped ceria composite membranes. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2015.01.047] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
33
|
Ma CY, Liu JJ, Zhang Y, Wang XZ. Simulation for scale-up of a confined jet mixer for continuous hydrothermal flow synthesis of nanomaterials. J Supercrit Fluids 2015. [DOI: 10.1016/j.supflu.2014.12.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
34
|
Goodall JBM, Illsley D, Lines R, Makwana NM, Darr JA. Structure-property-composition relationships in doped zinc oxides: enhanced photocatalytic activity with rare earth dopants. ACS COMBINATORIAL SCIENCE 2015; 17:100-12. [PMID: 25602735 DOI: 10.1021/co500109f] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
In this paper, we demonstrate the use of continuous hydrothermal flow synthesis (CHFS) technology to rapidly produce a library of 56 crystalline (doped) zinc oxide nanopowders and two undoped samples, each with different particle properties. Each sample was produced in series from the mixing of an aqueous stream of basic zinc nitrate (and dopant ion or modifier) solution with a flow of superheated water (at 450 °C and 24.1 MPa), whereupon a crystalline nanoparticle slurry was rapidly formed. Each composition was collected in series, cleaned, freeze-dried, and then characterized using analytical methods, including powder X-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller surface area measurement, X-ray photoelectron spectroscopy, and UV-vis spectrophotometry. Photocatalytic activity of the samples toward the decolorization of methylene blue dye was assessed, and the results revealed that transition metal dopants tended to reduce the photoactivity while rare earth ions, in general, increased the photocatalytic activity. In general, low dopant concentrations were more beneficial to having greater photodecolorization in all cases.
Collapse
Affiliation(s)
- Josephine B. M. Goodall
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Derek Illsley
- Sun Chemical, St Mary Cray, Kent BR5 3PP, United Kingdom
| | - Robert Lines
- Sun Chemical, St Mary Cray, Kent BR5 3PP, United Kingdom
| | - Neel M. Makwana
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Jawwad A. Darr
- Christopher
Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| |
Collapse
|
35
|
Nanocarrier mediated delivery of siRNA/miRNA in combination with chemotherapeutic agents for cancer therapy: current progress and advances. J Control Release 2014; 194:238-56. [PMID: 25204288 DOI: 10.1016/j.jconrel.2014.09.001] [Citation(s) in RCA: 251] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 08/29/2014] [Accepted: 09/01/2014] [Indexed: 12/21/2022]
Abstract
Chemotherapeutic agents have certain limitations when it comes to treating cancer, the most important being severe side effects along with multidrug resistance developed against them. Tumor cells exhibit drug resistance due to activation of various cellular level processes viz. activation of drug efflux pumps, anti-apoptotic defense mechanisms, etc. Currently, RNA interference (RNAi) based therapeutic approaches are under vibrant scrutinization to seek cancer cure. Especially small interfering RNA (siRNA) and micro RNA (miRNA), are able to knock down the carcinogenic genes by targeting the mRNA expression, which underlies the uniqueness of this therapeutic approach. Recent research focus in the regime of cancer therapy involves the engagement of targeted delivery of siRNA/miRNA in combinations with other therapeutic agents (such as gene, DNA or chemotherapeutic drug) for targeting permeability glycoprotein (P-gp), multidrug resistant protein 1 (MRP-1), B-cell lymphoma (BCL-2) and other targets that are mainly responsible for resistance in cancer therapy. RNAi-chemotherapeutic drug combinations have also been found to be effective against different molecular targets as well and can increase the sensitization of cancer cells to therapy several folds. However, due to stability issues associated with siRNA/miRNA suitable protective carrier is needed and nanotechnology based approaches have been widely explored to overcome these drawbacks. Furthermore, it has been univocally advocated that the co-delivery of siRNA/miRNA with other chemodrugs significantly enhances their capability to overcome cancer resistance compared to naked counterparts. The objective of this article is to review recent nanocarrier based approaches adopted for the delivery of siRNA/miRNA combinations with other anticancer agents (siRNA/miRNA/pDNA/chemodrugs) to treat cancer.
Collapse
|
36
|
Goodall JBM, Kellici S, Illsley D, Lines R, Knowles JC, Darr JA. Optical and photocatalytic behaviours of nanoparticles in the Ti–Zn–O binary system. RSC Adv 2014. [DOI: 10.1039/c3ra48030e] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
37
|
Ma CY, Chen M, Wang XZ. Modelling and simulation of counter-current and confined jet reactors for hydrothermal synthesis of nano-materials. Chem Eng Sci 2014. [DOI: 10.1016/j.ces.2014.01.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
38
|
Middelkoop V, Tighe CJ, Kellici S, Gruar RI, Perkins JM, Jacques SD, Barnes P, Darr JA. Imaging the continuous hydrothermal flow synthesis of nanoparticulate CeO2 at different supercritical water temperatures using in situ angle-dispersive diffraction. J Supercrit Fluids 2014. [DOI: 10.1016/j.supflu.2013.12.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
39
|
Bartlett PN, Cook DA, George MW, Hector AL, Ke J, Levason W, Reid G, Smith DC, Zhang W. Electrodeposition from supercritical fluids. Phys Chem Chem Phys 2014; 16:9202-19. [DOI: 10.1039/c3cp54955k] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
40
|
Quesada-Cabrera R, Weng X, Hyett G, Clark RJH, Wang XZ, Darr JA. High-throughput continuous hydrothermal synthesis of nanomaterials (part II): unveiling the as-prepared CexZryYzO2-δ phase diagram. ACS COMBINATORIAL SCIENCE 2013; 15:458-63. [PMID: 23902344 DOI: 10.1021/co3001346] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-throughput continuous hydrothermal flow synthesis was used to manufacture 66 unique nanostructured oxide samples in the Ce-Zr-Y-O system. This synthesis approach resulted in a significant increase in throughput compared to that of conventional batch or continuous hydrothermal synthesis methods. The as-prepared library samples were placed into a wellplate for both automated high-throughput powder X-ray diffraction and Raman spectroscopy data collection, which allowed comprehensive structural characterization and phase mapping. The data suggested that a continuous cubic-like phase field connects all three Ce-Zr-O, Ce-Y-O, and Y-Zr-O binary systems together with a smooth and steady transition between the structures of neighboring compositions. The continuous hydrothermal process led to as-prepared crystallite sizes in the range of 2-7 nm (as determined by using the Scherrer equation).
Collapse
Affiliation(s)
- Raul Quesada-Cabrera
- Department
of Chemistry, University College London, Christopher Ingold Laboratories,
20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Xiaole Weng
- Department of Environmental
Engineering, Zhejiang University, Zhejiang
Province, Hangzhou, 310027, P. R. China
| | - Geoff Hyett
- Department of Chemistry, University of Southampton, Highfield, Southampton,
SO17 1BJ, U.K
| | - Robin J. H. Clark
- Department
of Chemistry, University College London, Christopher Ingold Laboratories,
20 Gordon Street, London, WC1H 0AJ, United Kingdom
| | - Xue Z. Wang
- Institute
of Particle Science
and Engineering, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Jawwad A. Darr
- Department
of Chemistry, University College London, Christopher Ingold Laboratories,
20 Gordon Street, London, WC1H 0AJ, United Kingdom
| |
Collapse
|
41
|
Li X, Qiu Y, Wang S, Lu S, Gruar RI, Zhang X, Darr JA, He T. Electrophoretically deposited TiO2 compact layers using aqueous suspension for dye-sensitized solar cells. Phys Chem Chem Phys 2013; 15:14729-35. [DOI: 10.1039/c3cp51705e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|