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Mainali BP, Pattadar DK, Sharma JN, Zamborini FP. Electrochemical Analysis of the Thermal Stability of 0.9-4.1 nm Diameter Gold Nanoclusters. Anal Chem 2023. [PMID: 37506045 DOI: 10.1021/acs.analchem.3c01404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
Here we report the thermal properties of weakly stabilized 0.9, 1.6, and 4.1 nm Au nanoparticles (NPs)/nanoclusters (NCs) attached to indium-tin-oxide- or fluorine-doped-tin-oxide-coated glass electrodes (glass/ITO or glass/FTO). The peak oxidation potential (Ep) for Au measured by anodic stripping voltammetry (ASV) is indicative of the NP/NC size. Heating leads to a positive shift in Ep due to an increase in NP/NC size from thermal ripening. The size transition temperature (Tt) decreases with decreasing NP/NC size following the order of 4.1 nm (509 °C) > 1.6 nm (132 °C) > 0.9 nm (90 °C/109 °C, two transitions) as compared to the bulk melting point (Tm,b) for Au of 1064 °C. The Tt generally agrees with models describing the size-dependent melting point of Au NPs (Tm,NP) for 4.1 and 1.6 nm diameter Au NPs but is higher than the models for 0.9 nm Au NCs. Scanning electron microscopy (SEM) and UV-vis size analysis confirm the electrochemical results. The thermal stability of electrode-supported metal NPs/NCs is important for their effective use in catalysis, sensing, nanoelectronics, photovoltaics, and other applications.
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Affiliation(s)
- Badri P Mainali
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Dhruba K Pattadar
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Jay N Sharma
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Francis P Zamborini
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
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Süer NC, Acaroğlu Degitz İ, Sungur P, Bayır A, Eren T. Production of Au/phosphonium polymer nanoparticles. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110599] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Pattadar DK, Nambiar HN, Allen SL, Jasinski JB, Zamborini FP. Effect of Metal Nanoparticle Aggregate Structure on the Thermodynamics of Oxidative Dissolution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:7320-7327. [PMID: 34097413 DOI: 10.1021/acs.langmuir.1c00565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Here, we compare the electrochemical oxidation potential of 15 nm diameter citrate-stabilized Au NPs aggregated by acid (low pH) to those aggregated by tetrakis(hydroxymethyl) phosphonium chloride (THPC). For acid-induced aggregation, the solution changes to a blue-violet color, the localized surface plasmon resonance (LSPR) band of Au NPs at 520 nm decreases along with an increase in absorbance at higher wavelengths (600-800 nm), and the peak oxidation potential (Ep) in anodic stripping voltammetry (ASV) obtained in bromide has a positive shift by as large as 200 mV. For THPC-induced aggregation (Au/THPC mole ratio = 62.5), the solution changes to a blue color as the LSPR band at 520 nm decreases and a new distinct peak at 700 nm appears, but the Ep does not exhibit a positive shift. Scanning transmission electron microscopy (STEM) images reveal that acid-induced aggregates are three-dimensional with strongly fused Au NP-Au NP contacts, while THPC-induced aggregates are linear or two-dimensional with ∼1 nm separation between Au NPs. The surface area-to-volume ratio (SA/V) decreases for acid-aggregated Au NPs due to strong Au NP-Au NP contacts, which leads to lower surface free energy and a higher Ep. The SA/V does not change for THPC-aggregated Au NPs since space remains between them and their SA is fully accessible. These findings show that metal NP oxidative stability, as determined by ASV, is highly sensitive to the details of the aggregate structure.
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Affiliation(s)
- Dhruba K Pattadar
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721-0041, United States
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Zhou T, Li Q, Chen Y, Jiang X. Ligand-regulated self-assembly of luminescent Au nanoparticles towards diverse controllable superstructures. Chem Commun (Camb) 2020; 56:14023-14026. [PMID: 33099586 DOI: 10.1039/d0cc05732k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Only using one type of amphiphilic block copolymers as a template, we present a facile and robust approach to in situ fabricate a series of brightly emitting Au nano-assemblies with high controllability and tunability. Simply by altering thiol ligands, the Au nano-assemblies display diverse superstructures including fibers, vesicles, and honeycombs.
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Affiliation(s)
- Tingyao Zhou
- Department of Biomedical Engineering, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China.
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Moiseev DV, James BR. Syntheses and rearrangements of tris(hydroxymethyl)phosphine and tetrakis(hydroxymethyl)phosphonium salts. PHOSPHORUS SULFUR 2020. [DOI: 10.1080/10426507.2020.1764957] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | - Brian R. James
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada
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Kim DI, Park JH, Seo H, Hong SG, Kim HJ, Ahn H, Kim J, Moon GD, Hyun DC. Polymer particles with controllable and complex structures for high immobilization of noble-metal nanoparticles. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2019.11.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Antidiabetic Activity of Gold Nanoparticles Synthesized Using Wedelolactone in RIN-5F Cell Line. Antioxidants (Basel) 2019; 9:antiox9010008. [PMID: 31877697 PMCID: PMC7023137 DOI: 10.3390/antiox9010008] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 12/02/2019] [Accepted: 12/02/2019] [Indexed: 12/13/2022] Open
Abstract
We synthesized the gold nanoparticles (AuNPs) using wedelolactone (WDL) and characterized them using UV-visible spectroscopy, fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopic (SEM), transmission electron microscopic (TEM), energy dispersive X-ray diffraction, and atomic force microscopic (AFM) studies. The electronic spectrum exhibited an absorption peak at 535 nm. The FT-IR results proved that WDL was stabilized on the surface of AuNPs by acting as a capping or reducing agent. The crystalline structure was affirmed by XRD pattern and the spherical shape of WDL-AuNPs was evidenced by SEM, TEM, and AFM. The synthesized WDL-AuNPS were evaluated for anti-diabetic activity in pancreatic RIN-5F cell lines. In vitro results showed that WDL-AuNPs did not only improve the insulin secretion affected by di-(2-ethylhexyl) phthalate (DEHP), but also the cell viability in RIN5F cells. WDL-AuNPs treatment modulates the pro-apoptotic proteins and anti-apoptotic proteins expression to prevent the cells undergoing apoptosis in DEHP-exposed RIN-5F cells. The exposure of DEHP causes an increase in ROS production and lipid peroxidation levels. The free radical scavenging and antioxidant properties of WDL-AuNPs increase the deleterious effect caused by DEHP. On the other side, WDL-AuNPs increase mRNA expressions of insulin-signaling proteins in RIN-5F cells. This study concludes that WDL-AuNPs can be successfully used to regulate the expression of Bcl-2 family proteins, reduce lipid peroxidation, and to improve the secretion of antioxidants and insulin through the GLUT2 pathway in RIN-5F cell lines.
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Ong C, Cha BG, Kim J. Mesoporous Silica Nanoparticles Doped with Gold Nanoparticles for Combined Cancer Immunotherapy and Photothermal Therapy. ACS APPLIED BIO MATERIALS 2019; 2:3630-3638. [DOI: 10.1021/acsabm.9b00483] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Chunwei Ong
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Bong Geun Cha
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Jaeyun Kim
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
- Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences & Technology (SAIHST), Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
- Biomedical Institute for Convergence at SKKU (BICS), Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
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Pattadar DK, Zamborini FP. Size Stability Study of Catalytically Active Sub-2 nm Diameter Gold Nanoparticles Synthesized with Weak Stabilizers. J Am Chem Soc 2018; 140:14126-14133. [DOI: 10.1021/jacs.8b06830] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Dhruba K. Pattadar
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
| | - Francis P. Zamborini
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40292, United States
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Liu S, Zhao S, Tu W, Wang X, Wang X, Bao J, Wang Y, Han M, Dai Z. A “Signal On” Photoelectrochemical Biosensor Based on Bismuth@N,O-Codoped-Carbon Core-Shell Nanohybrids for Ultrasensitive Detection of Telomerase in HeLa Cells. Chemistry 2017; 24:3677-3682. [DOI: 10.1002/chem.201704251] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Indexed: 12/22/2022]
Affiliation(s)
- Shanshan Liu
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Shulin Zhao
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Wenwen Tu
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Xiaoying Wang
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Xiao Wang
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Jianchun Bao
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Yu Wang
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Min Han
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
| | - Zhihui Dai
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science; Nanjing Normal University; Nanjing 210023 P. R. China
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Brocker C, Kim H, Smith D, Barua S. Heteromer Nanostars by Spontaneous Self-Assembly. NANOMATERIALS 2017; 7:nano7060127. [PMID: 28561759 PMCID: PMC5485774 DOI: 10.3390/nano7060127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2017] [Revised: 05/17/2017] [Accepted: 05/23/2017] [Indexed: 11/16/2022]
Abstract
Heteromer star-shaped nanoparticles have the potential to carry out therapeutic agents, improve intracellular uptake, and safely release drugs after prolonged periods of residence at the diseased site. A one-step seed mediation process was employed using polylactide-co-glycolic acid (PLGA), polyvinyl alcohol (PVA), silver nitrate, and tetrakis(hydroxymethyl)phosphonium chloride (THPC). Mixing these reagents followed by UV irradiation successfully produced heteromer nanostars containing a number of arm chains attached to a single core with a high yield. The release of THPC from heteromer nanostars was tested for its potential use for breast cancer treatment. The nanostars present a unique geometrical design exhibiting a significant intracellular uptake by breast cancer cells but low cytotoxicity that potentiates its efficacy as drug carriers.
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Affiliation(s)
- Caitlin Brocker
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, 110 Bertelsmeyer Hall, 1101 N. State Street, Rolla, MO 65409, USA.
| | - Hannah Kim
- Department of Biological Sciences, Missouri University of Science and Technology, 143 Schrenk Hall, 400 W. 11th St., Rolla, MO 65409, USA.
| | - Daniel Smith
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, 110 Bertelsmeyer Hall, 1101 N. State Street, Rolla, MO 65409, USA.
| | - Sutapa Barua
- Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, 110 Bertelsmeyer Hall, 1101 N. State Street, Rolla, MO 65409, USA.
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