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Investigation of AOT/isooctane/water reverse microemulsion system with the presence of different mass ratios of SDS: Conductivity and water solubilization. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2
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Ceja-Fdez A, Carriles R, González-Yebra AL, Vivero-Escoto J, de la Rosa E, López-Luke T. Imaging and SERS Study of the Au Nanoparticles Interaction with HPV and Carcinogenic Cervical Tissues. Molecules 2021; 26:3758. [PMID: 34203098 PMCID: PMC8235590 DOI: 10.3390/molecules26123758] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 06/05/2021] [Accepted: 06/11/2021] [Indexed: 11/17/2022] Open
Abstract
In this work, gold NPs were prepared by the Turkevich method, and their interaction with HPV and cancerous cervical tissues were studied by scanning electron microscopy, energy-dispersive x-ray spectroscopy, confocal and multiphoton microscopy and SERS. The SEM images confirmed the presence and localization of the gold NPs inside of the two kinds of tissues. The light absorption of the gold NPs was at 520 nm. However, it was possible to obtain two-photon imaging (red emission region) of the gold NPs inside of the tissue, exciting the samples at 900 nm, observing the morphology of the tissues. The infrared absorption was probably due to the aggregation of gold NPs inside the tissues. Therefore, through the interaction of gold nanoparticles with the HPV and cancerous cervical tissues, a surface enhanced Raman spectroscopy (SERS) was obtained. As preliminary studies, having an average of 1000 Raman spectra per tissue, SERS signals showed changes between the HPV-infected and the carcinogenic tissues; these spectral signatures occurred mainly in the DNA bands, potentially offering a tool for the rapid screening of cancer.
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Affiliation(s)
- Andrea Ceja-Fdez
- Departamento de Física Médica, División de Ciencias e Ingenierías Campus León, Universidad de Guanajuato, León 37150, Mexico;
| | - Ramon Carriles
- Centro de Investigaciones en Óptica, A.P. 1-948, León 37150, Mexico;
| | - Ana Lilia González-Yebra
- Departamento de Ciencias Aplicadas al Trabajo, División Ciencias de la Salud, Campus León, Universidad de Guanajuato, León 37670, Mexico;
| | - Juan Vivero-Escoto
- Department of Chemistry, The University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, NC 28223, USA;
| | - Elder de la Rosa
- Facultad de Ingenierías, Campus Campestre, Universidad De La Salle Bajio, León 37150, Mexico;
| | - Tzarara López-Luke
- Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Edificio U, Ciudad Universitaria, Morelia 58030, Mexico
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3
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Bardhan S, Rahman MH, Banerjee S, Singh AP, Senapati S. Extended H-Bonding through Protic Ionic Liquids Facilitates the Growth and Stability of Water Domains in Hydrophobic Environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:15362-15372. [PMID: 33305946 DOI: 10.1021/acs.langmuir.0c02855] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Discrete water domains in hydrophobic environment find relevance in aerosols, oil refinery, the human body, etc. The interfacial microstructure plays a crucial role in the stability of such water domains. Over the decades, the amphiphile-induced electrostatic interaction is considered to be the major stabilizing factor operating at these interfaces. Here we take the representative water/AOT/oil microemulsion to show that creating a strong H-bonding network through suitable additive, such as protic ionic liquid (IL) at the interface, helps both the growth and stability of water domains in the hydrophobic phase. On the other hand, common electrolytes and aprotic ILs fail to replicate such behavior as seen by Raman, Fourier transform infrared spectroscopy, dynamic light scattering (DLS), and electron microscopy measurements. Experimental results are further supported by the all-atomic molecular dynamics (MD) simulations that showed extended H-bonding mediated by the protic IL cations that were localized at the interface. High temperature DLS and rheology studies have shown greater thermal stability and mechanical strengths of our biocompatible microemulsions, which have potential to become suitable templates for in situ synthesis of nanoparticle and various organic compounds.
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Affiliation(s)
- Soumik Bardhan
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India
| | - Mohammad Homaidur Rahman
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India
| | - Shankha Banerjee
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India
| | - Akhil Pratap Singh
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India
| | - Sanjib Senapati
- Department of Biotechnology and BJM School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India
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4
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Koetz J. The Effect of Surface Modification of Gold Nanotriangles for Surface-Enhanced Raman Scattering Performance. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E2187. [PMID: 33147806 PMCID: PMC7694140 DOI: 10.3390/nano10112187] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 10/29/2020] [Indexed: 11/16/2022]
Abstract
A surface modification of ultraflat gold nanotriangles (AuNTs) with different shaped nanoparticles is of special relevance for surface-enhanced Raman scattering (SERS) and the photo-catalytic activity of plasmonic substrates. Therefore, different approaches are used to verify the flat platelet morphology of the AuNTs by oriented overgrowth with metal nanoparticles. The most important part for the morphological transformation of the AuNTs is the coating layer, containing surfactants or polymers. By using well established AuNTs stabilized by a dioctyl sodium sulfosuccinate (AOT) bilayer, different strategies of surface modification with noble metal nanoparticles are possible. On the one hand undulated superstructures were synthesized by in situ growth of hemispherical gold nanoparticles in the polyethyleneimine (PEI)-coated AOT bilayer of the AuNTs. On the other hand spiked AuNTs were obtained by a direct reduction of Au3+ ions in the AOT double layer in presence of silver ions and ascorbic acid as reducing agent. Additionally, crumble topping of the smooth AuNTs can be realized after an exchange of the AOT bilayer by hyaluronic acid, followed by a silver-ion mediated reduction with ascorbic acid. Furthermore, a decoration with silver nanoparticles after coating the AOT bilayer with the cationic surfactant benzylhexadecyldimethylammonium chloride (BDAC) can be realized. In that case the ultraviolet (UV)-absorption of the undulated Au@Ag nanoplatelets can be tuned depending on the degree of decoration with silver nanoparticles. Comparing the Raman scattering data for the plasmon driven dimerization of 4-nitrothiophenol (4-NTP) to 4,4'-dimercaptoazobenzene (DMAB) one can conclude that the most important effect of surface modification with a 75 times higher enhancement factor in SERS experiments becomes available by decoration with gold spikes.
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Affiliation(s)
- Joachim Koetz
- Institute for Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 25, 14476 Potsdam, Germany
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5
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Henning R, Liebig F, Prietzel C, Klemke B, Koetz J. Gold nanotriangles with magnetite satellites. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Liebig F, Sarhan RM, Schmitt CNZ, Thünemann AF, Prietzel C, Bargheer M, Koetz J. Gold Nanotriangles with Crumble Topping and their Influence on Catalysis and Surface-Enhanced Raman Spectroscopy. Chempluschem 2020; 85:519-526. [PMID: 31961045 DOI: 10.1002/cplu.201900745] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/20/2020] [Indexed: 12/12/2022]
Abstract
By adding hyaluronic acid (HA) to dioctyl sodium sulfosuccinate (AOT)-stabilized gold nanotriangles (AuNTs) with an average thickness of 7.5±1 nm and an edge length of about 175±17 nm, the AOT bilayer is replaced by a polymeric HA-layer leading to biocompatible nanoplatelets. The subsequent reduction process of tetrachloroauric acid in the HA-shell surrounding the AuNTs leads to the formation of spherical gold nanoparticles on the platelet surface. With increasing tetrachloroauric acid concentration, the decoration with gold nanoparticles can be tuned. SAXS measurements reveal an increase of the platelet thickness up to around 14.5 nm, twice the initial value of bare AuNTs. HRTEM micrographs show welding phenomena between densely packed particles on the platelet surface, leading to a crumble formation while preserving the original crystal structure. Crumbles crystallized on top of the platelets enhance the Raman signal by a factor of around 20, and intensify the plasmon-driven dimerization of 4-nitrothiophenol (4-NTP) to 4,4'-dimercaptoazobenzene in a yield of up to 50 %. The resulting crumbled nanotriangles, with a biopolymer shell and the absorption maximum in the second window for in vivo imaging, are promising candidates for biomedical sensing.
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Affiliation(s)
- Ferenc Liebig
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 25, 14476, Potsdam, Germany
| | - Radwan M Sarhan
- Chemistry Department Faculty of Science, Cairo University, Cairo, 12613, Egypt.,Institute of Physics, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 27, 14476, Potsdam, Germany.,Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof (SALSA), Albert-Einstein-Str. 5-9, 10099, Berlin, Germany
| | - Clemens N Z Schmitt
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476, Potsdam, Germany
| | - Andreas F Thünemann
- Anstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205, Berlin, Germany
| | - Claudia Prietzel
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 25, 14476, Potsdam, Germany
| | - Matias Bargheer
- Institute of Physics, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 27, 14476, Potsdam, Germany
| | - Joachim Koetz
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Strasse 24-25, Haus 25, 14476, Potsdam, Germany
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Liebig F, Sarhan RM, Bargheer M, Schmitt CNZ, Poghosyan AH, Shahinyan AA, Koetz J. Spiked gold nanotriangles: formation, characterization and applications in surface-enhanced Raman spectroscopy and plasmon-enhanced catalysis. RSC Adv 2020; 10:8152-8160. [PMID: 35497869 PMCID: PMC9050016 DOI: 10.1039/d0ra00729c] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 02/12/2020] [Indexed: 11/21/2022] Open
Abstract
We show the formation of metallic spikes on the surface of gold nanotriangles (AuNTs) by using the same reduction process which has been used for the synthesis of gold nanostars. We confirm that silver nitrate operates as a shape-directing agent in combination with ascorbic acid as the reducing agent and investigate the mechanism by dissecting the contribution of each component, i.e., anionic surfactant dioctyl sodium sulfosuccinate (AOT), ascorbic acid (AA), and AgNO3. Molecular dynamics (MD) simulations show that AA attaches to the AOT bilayer of nanotriangles, and covers the surface of gold clusters, which is of special relevance for the spike formation process at the AuNT surface. The surface modification goes hand in hand with a change of the optical properties. The increased thickness of the triangles and a sizeable fraction of silver atoms covering the spikes lead to a blue-shift of the intense near infrared absorption of the AuNTs. The sponge-like spiky surface increases both the surface enhanced Raman scattering (SERS) cross section of the particles and the photo-catalytic activity in comparison with the unmodified triangles, which is exemplified by the plasmon-driven dimerization of 4-nitrothiophenol (4-NTP) to 4,4′-dimercaptoazobenzene (DMAB). We show the formation of metallic spikes on the surface of gold nanotriangles (AuNTs) by using the same reduction process which has been used for the synthesis of gold nanostars leading to a higher SERS enhancement by a factor of 75.![]()
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Affiliation(s)
- Ferenc Liebig
- Institute for Chemistry
- University of Potsdam
- 14476 Potsdam
- Germany
| | - Radwan M. Sarhan
- Chemistry Department
- Faculty of Science
- Cairo University
- Cairo 12613
- Egypt
| | - Matias Bargheer
- Institute for Physics
- University of Potsdam
- 14476 Potsdam
- Germany
| | - Clemens N. Z. Schmitt
- Department of Biomaterials
- Max Planck Institute of Colloids and Interfaces
- 14476 Potsdam
- Germany
| | - Armen H. Poghosyan
- International Scientific-Educational Center of National Academy of Sciences
- 0019 Yerevan
- Armenia
| | - Aram A. Shahinyan
- International Scientific-Educational Center of National Academy of Sciences
- 0019 Yerevan
- Armenia
| | - Joachim Koetz
- Institute for Chemistry
- University of Potsdam
- 14476 Potsdam
- Germany
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8
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Ma T, Duan H, Zhang W, Shao Y, Hao L, Chen X, Leng Y, Huang X, Xiong Y. An amphiphilic-ligand-modified gold nanoflower probe for enhancing the stability of lateral flow immunoassays in dried distillers grains. RSC Adv 2019; 9:36670-36679. [PMID: 35539045 PMCID: PMC9075177 DOI: 10.1039/c9ra06690j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Accepted: 10/28/2019] [Indexed: 01/21/2023] Open
Abstract
An amphiphilic ligand-capped gold nanoflower (AuNF) was proposed as a novel lateral flow immunoassay (LFA) reporter for zearalenone (ZEN) detection in distillers dried grains solubles (DDGS).
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Affiliation(s)
- Tongtong Ma
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- Jiangxi-OAI Joint Research Institute
| | - Hong Duan
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- Jiangxi-OAI Joint Research Institute
| | - Wenjing Zhang
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- Jiangxi-OAI Joint Research Institute
| | - Yanna Shao
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- Jiangxi-OAI Joint Research Institute
| | - Liangwen Hao
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- Jiangxi-OAI Joint Research Institute
| | - Xirui Chen
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- Jiangxi-OAI Joint Research Institute
| | - Yuankui Leng
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- School of Food Science and Technology
| | - Xiaolin Huang
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- School of Food Science and Technology
| | - Yonghua Xiong
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- P. R. China
- Jiangxi-OAI Joint Research Institute
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