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Ali RF, Gates BD. Elucidating the role of precursors in synthesizing single crystalline lithium niobate nanomaterials: a study of effects of lithium precursors on nanoparticle quality. NANOSCALE 2021; 13:3214-3226. [PMID: 33528486 DOI: 10.1039/d0nr08652e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A number of solution-based procedures have been realized for the synthesis of lithium niobate (LiNbO3) nanoparticles (NPs). Relatively little is, however, known about the influences of the selection of lithium (Li) precursors on the resulting dimensions, shapes, crystallinity, and purity of the products. A comparative study is provided herein on the role of different Li precursors during the synthesis of LiNbO3 NPs. To the best of our knowledge, this study provides the first systematic comparison of the effects of various Li reagents on the preparation of LiNbO3 NPs through solvothermal processes. This solution-phase approach was tuned by the inclusion of Li precursors that either lacked carbon based anions (e.g., F-, Cl-, Br-, I-, OH-, NO3-, or SO42-) or contained carbon-based anions (e.g., C2H5O-, C2H3OO-, C5H7OO-, or CO32-). All other variables were held constant during the synthesis, such as reaction temperature, solvent, niobium precursor, and surfactants. The results of these studies suggest that the type of Li precursor selected plays an important role in nanoparticle formation, such as through controlling the uniformity, crystallinity, and aggregation of LiNbO3 NPs. The average diameter of the resulting NPs can also vary from ∼30 to ∼830 nm as a function of the Li reagent used in the synthesis. The selection of Li precursors also influences the phase purity of the products. This comparative study on the preparation of crystalline LiNbO3 NPs represents a critical step forward to understand the influences and roles of precursors in the design of synthetic processes for the preparation of a variety of alkali metal niobates (e.g., including NaNbO3 and KNbO3) and crystalline metal oxide-based NPs containing other transition metals (e.g., titanium, tantalum).
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Affiliation(s)
- Rana Faryad Ali
- Department of Chemistry and 4D LABS, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
| | - Byron D Gates
- Department of Chemistry and 4D LABS, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6, Canada.
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Suchomel P, Kvitek L, Panacek A, Prucek R, Hrbac J, Vecerova R, Zboril R. Comparative study of antimicrobial activity of AgBr and Ag nanoparticles (NPs). PLoS One 2015; 10:e0119202. [PMID: 25781988 PMCID: PMC4363559 DOI: 10.1371/journal.pone.0119202] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 01/11/2015] [Indexed: 11/30/2022] Open
Abstract
The diverse mechanism of antimicrobial activity of Ag and AgBr nanoparticles against gram-positive and gram-negative bacteria and also against several strains of candida was explored in this study. The AgBr nanoparticles (NPs) were prepared by simple precipitation of silver nitrate by potassium bromide in the presence of stabilizing polymers. The used polymers (PEG, PVP, PVA, and HEC) influence significantly the size of the prepared AgBr NPs dependently on the mode of interaction of polymer with Ag+ ions. Small NPs (diameter of about 60–70 nm) were formed in the presence of the polymer with low interaction as are PEG and HEC, the polymers which interact with Ag+ strongly produce nearly two times bigger NPs (120–130 nm). The prepared AgBr NPs were transformed to Ag NPs by the reduction using NaBH4. The sizes of the produced Ag NPs followed the same trends – the smallest NPs were produced in the presence of PEG and HEC polymers. Prepared AgBr and Ag NPs dispersions were tested for their biological activity. The obtained results of antimicrobial activity of AgBr and Ag NPs are discussed in terms of possible mechanism of the action of these NPs against tested microbial strains. The AgBr NPs are more effective against gram-negative bacteria and tested yeast strains while Ag NPs show the best antibacterial action against gram-positive bacteria strains.
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Affiliation(s)
- Petr Suchomel
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University Olomouc, Czech Republic
- Department of Physical Chemistry, Faculty of Science, Palacky University Olomouc, Czech Republic
| | - Libor Kvitek
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University Olomouc, Czech Republic
- Department of Physical Chemistry, Faculty of Science, Palacky University Olomouc, Czech Republic
- * E-mail:
| | - Ales Panacek
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University Olomouc, Czech Republic
- Department of Physical Chemistry, Faculty of Science, Palacky University Olomouc, Czech Republic
| | - Robert Prucek
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University Olomouc, Czech Republic
- Department of Physical Chemistry, Faculty of Science, Palacky University Olomouc, Czech Republic
| | - Jan Hrbac
- Department of Physical Chemistry, Faculty of Science, Palacky University Olomouc, Czech Republic
| | - Renata Vecerova
- Department of Microbiology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Czech Republic
| | - Radek Zboril
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University Olomouc, Czech Republic
- Department of Physical Chemistry, Faculty of Science, Palacky University Olomouc, Czech Republic
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Skeete Z, Cheng H, Crew E, Lin L, Zhao W, Joseph P, Shan S, Cronk H, Luo J, Li Y, Zhang Q, Zhong CJ. Design of functional nanoparticles and assemblies for theranostic applications. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21752-21768. [PMID: 25111087 DOI: 10.1021/am502693t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Nanostructured materials have found increasing applications in medical therapies and diagnostics (theranostics). The main challenge is the ability to impart the nanomaterials with structurally tailored functional properties which can effectively target biomolecules but also provide signatures for effective detection. The harnessing of functional nanoparticles and assemblies serves as a powerful strategy for the creation of the structurally tailored multifunctional properties. This article highlights some of the important design strategies in recent investigation of metals (especially gold and silver), and magnetically functionalized nanoparticles, and molecularly assembled or biomolecularly conjugated nanoparticles with tunable optical, spectroscopic, magnetic, and electrical properties for applications in several areas of potential theranostic interests. Examples include colorimetric detection of amino acids and small peptides, surface-enhanced Raman scattering detection of biomolecular recognition of proteins and DNAs, delivery in cell transfection and bacteria inactivation, and chemiresistive detection of breath biomarkers. A major emphasis is placed on understanding how the control of the nanostructures and the molecular and biomolecular interactions impact these biofunctional properties, which has important implications for bottom-up designs of theranostic materials.
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Affiliation(s)
- Zakiya Skeete
- Department of Chemistry, State University of New York at Binghamton , Binghamton, New York 13902, United States
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Long Y, Lin Z, Xia M, Zheng W, Li Z. Mechanism of HERG potassium channel inhibition by tetra-n-octylammonium bromide and benzethonium chloride. Toxicol Appl Pharmacol 2013; 267:155-66. [PMID: 23313619 DOI: 10.1016/j.taap.2012.12.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/12/2012] [Accepted: 12/28/2012] [Indexed: 10/27/2022]
Abstract
Tetra-n-octylammonium bromide and benzethonium chloride are synthetic quaternary ammonium salts that are widely used in hospitals and industries for the disinfection and surface treatment and as the preservative agent. Recently, the activities of HERG channel inhibition by these compounds have been found to have potential risks to induce the long QT syndrome and cardiac arrhythmia, although the mechanism of action is still elusive. This study was conducted to investigate the mechanism of HERG channel inhibition by these compounds by using whole-cell patch clamp experiments in a CHO cell line stably expressing HERG channels. Tetra-n-octylammonium bromide and benzethonium chloride exhibited concentration-dependent inhibitions of HERG channel currents with IC(50) values of 4nM and 17nM, respectively, which were also voltage-dependent and use-dependent. Both compounds shifted the channel activation I-V curves in a hyperpolarized direction for 10-15mV and accelerated channel activation and inactivation processes by 2-fold. In addition, tetra-n-octylammonium bromide shifted the inactivation I-V curve in a hyperpolarized direction for 24.4mV and slowed the rate of channel deactivation by 2-fold, whereas benzethonium chloride did not. The results indicate that tetra-n-octylammonium bromide and benzethonium chloride are open-channel blockers that inhibit HERG channels in the voltage-dependent, use-dependent and state-dependent manners.
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Affiliation(s)
- Yan Long
- Key Laboratory of Regenerative Biology, Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou 510530, China
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Chakraborty M, Hsiao FW, Naskar B, Chang CH, Panda AK. Surfactant-assisted synthesis and characterization of stable silver bromide nanoparticles in aqueous media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7282-7290. [PMID: 22512457 DOI: 10.1021/la300615b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Colloidal dispersions of silver bromide (AgBr) in aqueous surfactant medium have been prepared using a surfactant-assisted synthesis approach with hexadecyltrimethylammonium bromide (CTAB). The surfactant acts both as source of bromide ion as well as the stabilizing agent. Upon progressive addition of silver nitrate to aqueous CTAB solution, stable AgBr dispersions were obtained. Formation of surfactant cation (CTA(+)) stabilized AgBr was confirmed by way of XRD, FTIR and NMR studies. Thermal behavior of the isolated nanoparticles was investigated by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA), where the occurrence of phase transition in the surfactant-stabilized nanoparticles was observed. Kinetics of the particle growth was investigated by dynamic light scattering measurements, which predicted the formation of surfactant bilayered structures associated with the nanoparticles of AgBr. Band gap of the nanoparticles was determined by suitably analyzing the UV-visible spectral data, which concluded that the particles behaved like insulators. Morphology of the particles, studied by TEM measurements, was found to be spherical. Finally, enthalpy of formation of surfactant-stabilized AgBr, determined calorimetrically, was found to be dependent on the concentration of the precursors.
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Affiliation(s)
- Moumita Chakraborty
- Department of Chemistry, University of North Bengal, Darjeeling 734 013, W.B., India
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Abstract
AbstractThis paper discusses the experimental results of the production of nanocolloidal silver using photoreduction method. Ultrafine crystalline gelatine-stabilised aqueous suspensions of silver bromide were used as a substrate for the synthesis of silver nanoparticles (Ag NPs). The influences of the reductant to substrate molar ratio, the medium’s pH, the type of the source of actinic radiation and the time of exposure to the efficient production of the Ag NPs were studied. A typical reaction was suggested, which involves the photo-induced reduction of silver bromide nanocrystals in the presence of ascorbic acid under specified physicochemical conditions. The properties of resultant silver particles were examined using UV-Vis spectroscopy and Dynamic Light Scattering (DLS). In addition, Transmission Electron Microscopy (TEM) was used for imaging the silver nanoparticle suspensions.
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Ivanov IM, Bulavchenko AI. Thermochemical study of silver halide nanoparticles formation conditions in AOT inverted micelles. RUSS J INORG CHEM+ 2010. [DOI: 10.1134/s0036023610060240] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Krutyakov YA, Olenin AY, Kudrinskii AA, Dzhurik PS, Lisichkin GV. Aggregative stability and polydispersity of silver nanoparticles prepared using two-phase aqueous organic systems. ACTA ACUST UNITED AC 2008. [DOI: 10.1134/s1995078008050054] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Khairallah GN, O'Hair RAJ. Gas phase synthesis, structure and unimolecular reactivity of silver iodide cluster cations, AgnIm+ (n = 2–5, 0 < m < n). Dalton Trans 2008:2956-65. [DOI: 10.1039/b719274f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mirkhalaf F, Paprotny J, Schiffrin DJ. Synthesis of Metal Nanoparticles Stabilized by Metal−Carbon Bonds. J Am Chem Soc 2006; 128:7400-1. [PMID: 16756268 DOI: 10.1021/ja058687g] [Citation(s) in RCA: 170] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new method for the preparation of metal nanoparticles in organic media is proposed. This is based on the formation of metal-carbon bonds after reduction of the corresponding diazonium derivative of the capping ligand. The particles are very stable due to the strong metal-ligand covalent bond, and the proposed method appears to be an alternative for the preparation of monolayer-protected metal nanoparticles when the formation of metal-sulfur or metal-nitrogen bonds needs to be avoided.
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Affiliation(s)
- Fakhradin Mirkhalaf
- Centre for Nanoscale Science, Chemistry Department, Liverpool University, Liverpool L69 7ZD, UK.
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Kariuki NN, Luo J, Maye MM, Hassan SA, Menard T, Naslund HR, Lin Y, Wang C, Engelhard MH, Zhong CJ. Composition-controlled synthesis of bimetallic gold-silver nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:11240-11246. [PMID: 15568881 DOI: 10.1021/la048438q] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This paper reports findings of an investigation of the synthesis of monolayer-capped binary gold-silver (AuAg) bimetallic nanoparticles that is aimed at understanding the control factors governing the formation of the bimetallic compositions. The synthesis of alkanethiolate-capped AuAg nanoparticles was carried out using two related synthetic protocols using aqueous sodium borohydride as a reducing agent. One involves a two-phase reduction of AuCl(4)(-), which is dissolved in organic solution, and Ag(+), which is dissolved in aqueous solution. The other protocol involves a two-phase reduction of AuCl(4)(-) and AgBr(2)(-), both of which are dissolved in the same organic solution. AuAg nanoparticles of 2-3 nm core sizes with different compositions in the range of 0-100% Au have been synthesized. The two synthetic routes were compared in terms of bimetallic composition and size properties. Our new findings have allowed us to establish the correlation between synthetic feeding of metals and metal compositions in the bimetallic nanoparticles, which have important implications to the exploration of gold-based bimetallic nanoparticles for constructing sensing and catalytic nanomaterials.
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Affiliation(s)
- Nancy N Kariuki
- Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902, USA
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