1
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Shimpi JR, Thomas R, Meena SK, Prasad BLV. Influence of van der Waals Interactions between the Alkyl Chains of Surface Ligands on the Size and Size Distribution of Nanocrystals Prepared by the Digestive Ripening Process. Langmuir 2023. [PMID: 38012063 DOI: 10.1021/acs.langmuir.3c02316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Thermal heating of polydispersed nanocrystals (NCs) with surface-active organic ligands in a solvent leads to the formation of monodispersed NCs, and this process is known as digestive ripening (DR). Here, by performing DR on Au NCs using different-chain-length amine and thiol ligands, we evidently show that ligands with C12 chain length result in the formation of NCs with narrow size distributions when compared to C8, C16, and C20 chain length ligands. Furthermore, our findings also show that in the case of alkyl thiol, the NC size remains more or less the same, while the size distribution gets altered significantly with the chain length. On the other hand, both size and size distribution are affected significantly when the alkyl amine chain length is varied. Fourier transform infrared (FTIR) studies indicate that the van der Waals (vdW) interactions are weakest when the amine with C12 carbon chain is used as the DR agent, while in the case of thiols, molecules with C8 and C12 chain lengths have nearly the same vdW interactions (with C12 slightly weaker than C8), which are weaker than those of C16 and C20. Molecular dynamics (MD) simulation results corroborate the experimental observations and suggest that due to more defects in the alkyl chain, the C8 and C12 (amine as well as thiol) ligands are disordered and less stable on Au(111) and Au(100) surfaces. This could result in efficient etching and redeposition, making the ligands with C8 and C12 chain lengths the better DR agents.
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Affiliation(s)
- Jayesh R Shimpi
- Physical and Material Chemistry Division, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Rinto Thomas
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Chemical Engineering and Process Development Division, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Santosh Kumar Meena
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Chemical Engineering and Process Development Division, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
- Department of Chemical Engineering, Indian Institute of Technology (IIT), Ropar 140001, India
| | - Bhagavatula L V Prasad
- Physical and Material Chemistry Division, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No.7, Shivanapura, Dasanapura Hobli, Bengaluru 562162, India
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2
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Akavaram V, Kumar K, Sriram S, Narra S, Kumawat A, Meena SK, Pushpavanam K. Self-Assembled Amino Acid Microstructures as Biocompatible Physically Unclonable Functions (BPUFs) for Authentication of Therapeutically Relevant Hydrogels. Macromol Biosci 2023; 23:e2300091. [PMID: 37357814 DOI: 10.1002/mabi.202300091] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 06/10/2023] [Indexed: 06/27/2023]
Abstract
Counterfeited biomedical products result in significant economic losses and pose a public health hazard for over a million people yearly. Hydrogels, a class of biomedical products, are being investigated as alternatives to conventional biomedical products and are equally susceptible to counterfeiting. Here, a biocompatible, physically unclonable function (BPUF) to verify the authenticity of therapeutically relevant hydrogels are developed. The principle of BPUF relies on the self-assembly of tyrosine into fibril-like structures which are incorporated into therapeutically relevant hydrogels resulting in their random dispersion. This unclonable arrangement leads to distinctive optical micrographs captured using an optical microscope. These optical micrographs are transformed into a unique security code through cryptographic techniques which are then used to authenticate the hydrogel. The temporal stability of the BPUFs are demonstrated and additionally, exploit the dissolution propensity of the structures upon exposure to an adulterant to identify the tampering of the hydrogel. Finally, a platform to demonstrate the translational potential of this technology in validating and detecting tampering of therapeutically relevant hydrogels is developed. The potential of BPUFs to combat hydrogel counterfeiting is exemplified by its simplicity in production, ease of use, biocompatibility, and cost-effectiveness.
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Affiliation(s)
- Vishwas Akavaram
- Discipline of Chemical Engineering, Indian Institute of Technology Gandhinagar, Gujarat, 382355, India
| | - Kush Kumar
- Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory (N.C.L.), Dr. HomiBhabha Road, Pune, 411008, India
| | - Shreya Sriram
- Department of Computer Science and Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, Tamil Nadu, 603110, India
| | - Saisrinath Narra
- Department of Computer Science and Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, Tamil Nadu, 603110, India
| | - Akshant Kumawat
- Discipline of Chemical Engineering, Indian Institute of Technology Gandhinagar, Gujarat, 382355, India
| | - Santosh Kumar Meena
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab, 140001, India
| | - Karthik Pushpavanam
- Discipline of Chemical Engineering, Indian Institute of Technology Gandhinagar, Gujarat, 382355, India
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3
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Aarabi M, Aranda D, Gholami S, Meena SK, Lerouge F, Bretonniere Y, Gürol I, Baldeck P, Parola S, Dumoulin F, Cerezo J, Garavelli M, Santoro F, Rivalta I. Quantum-Classical Protocol for Efficient Characterization of Absorption Lineshape and Fluorescence Quenching upon Aggregation: The Case of Zinc Phthalocyanine Dyes. J Chem Theory Comput 2023; 19:5938-5957. [PMID: 37641958 PMCID: PMC10500990 DOI: 10.1021/acs.jctc.3c00446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Indexed: 08/31/2023]
Abstract
A quantum-classical protocol that incorporates Jahn-Teller vibronic coupling effects and cluster analysis of molecular dynamics simulations is reported, providing a tool for simulations of absorption spectra and ultrafast nonadiabatic dynamics in large molecular photosystems undergoing aggregation in solution. Employing zinc phthalocyanine dyes as target systems, we demonstrated that the proposed protocol provided fundamental information on vibronic, electronic couplings and thermal dynamical effects that mostly contribute to the absorption spectra lineshape and the fluorescence quenching processes upon dye aggregation. Decomposing the various effects arising upon dimer formation, the structure-property relations associated with their optical responses have been deciphered at atomistic resolution.
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Affiliation(s)
- Mohammad Aarabi
- Dipartimento
di Chimica Industriale “Toso Montanari”, Universitá degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Daniel Aranda
- Consiglio
Nazionale delle Ricerche, Istituto di Chimica
dei Composti Organo Metallici (ICCOM-CNR), I-56124 Pisa, Italy
- Instituto
de Ciencia Molecular (ICMol), Universidad
de Valencia, Catedrático
J. Beltrán 2, 46980 Paterna, Valencia, Spain
| | - Samira Gholami
- Dipartimento
di Chimica Industriale “Toso Montanari”, Universitá degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Santosh Kumar Meena
- Department
of Chemical Engineering, Indian Institute
of Technology Ropar, Rupnagar, 140001 Punjab, India
| | - Frederic Lerouge
- ENSL,
CNRS, Laboratoire de Chimie UMR 5182, 46 Allée d’Italie, 69364 Lyon, France
| | - Yann Bretonniere
- ENSL,
CNRS, Laboratoire de Chimie UMR 5182, 46 Allée d’Italie, 69364 Lyon, France
| | - Ilke Gürol
- TÜBITAK
Marmara Research Center, Materials Technologies, Gebze, 41470 Kocaeli, Türkiye
| | - Patrice Baldeck
- ENSL,
CNRS, Laboratoire de Chimie UMR 5182, 46 Allée d’Italie, 69364 Lyon, France
| | - Stephane Parola
- ENSL,
CNRS, Laboratoire de Chimie UMR 5182, 46 Allée d’Italie, 69364 Lyon, France
| | - Fabienne Dumoulin
- Department
of Biomedical Engineering, Faculty of Engineering and Natural Sciences, Acibadem Mehmet Ali Aydinlar University, 34752 Istanbul, Türkiye
| | - Javier Cerezo
- Consiglio
Nazionale delle Ricerche, Istituto di Chimica
dei Composti Organo Metallici (ICCOM-CNR), I-56124 Pisa, Italy
- Departamento
de Química and Institute for Advanced Research in Chemical
Sciences (IAdChem), Universidad Autónoma
de Madrid, 28049 Madrid, Spain
| | - Marco Garavelli
- Dipartimento
di Chimica Industriale “Toso Montanari”, Universitá degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Fabrizio Santoro
- Consiglio
Nazionale delle Ricerche, Istituto di Chimica
dei Composti Organo Metallici (ICCOM-CNR), I-56124 Pisa, Italy
| | - Ivan Rivalta
- Dipartimento
di Chimica Industriale “Toso Montanari”, Universitá degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
- ENSL,
CNRS, Laboratoire de Chimie UMR 5182, 46 Allée d’Italie, 69364 Lyon, France
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4
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Meena SK, Meena C. The implication of adsorption preferences of ions and surfactants on the shape control of gold nanoparticles: a microscopic, atomistic perspective. Nanoscale 2021; 13:19549-19560. [PMID: 34806728 DOI: 10.1039/d1nr05244f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Shape modulation of nanoparticles is crucial for their tailored applications; however, it depends on surfactants, ions, reactants, and other additives present in the growth solution. Here we dissect the role of surfactants, their counterions (halide ions), silver ions, and gold reactant in gold nanoparticle anisotropic growth using polarizable surfaces and nanoseed molecular dynamics simulation models. Our planar surface models predict a 14%-16% increment in cetyltrimethylammonium bromide (CTAB) coverage on Au(111) and Au(100) due to the surface polarization effect. The CTAB micelle adsorbs compactly similar to that observed on non-polarizable surfaces. The cetyltrimethylammonium chloride (CTAC) micelle remains in solution leaving the polarizable gold surfaces unprotected, similar to that observed with the non-polarizable surfaces, which favors isotropic growth. The cetyltrimethylammonium iodide (CTAI) micelle adsorbs with higher surface densities than CTAB on all the surfaces. The surface polarizable penta-twinned nanoseed model predicts the total surface coverage of the cetyltrimethylammonium cation (CTA+), Br- and Ag+ to be around two times higher on the side as compared to the tip of the nanoseed, leading to a 2.6 times higher initial rate of adsorption of AuCl2- on the tip than on the side. Predicted CTA+ surface densities on the tip and the side of the nanoseed are consistent with experimental results. Our simulations explain the growth mechanism of anisotropic nanoparticles and the microscopic origin of their controlled shapes.
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Affiliation(s)
- Santosh Kumar Meena
- Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory (NCL), Dr. HomiBhabha Road, Pune-411008, India.
| | - Chandrakala Meena
- Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory (NCL), Dr. HomiBhabha Road, Pune-411008, India.
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5
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Meena SK, Lerouge F, Baldeck P, Andraud C, Garavelli M, Parola S, Sulpizi M, Rivalta I. On the origin of controlled anisotropic growth of monodisperse gold nanobipyramids. Nanoscale 2021; 13:15292-15300. [PMID: 34486622 DOI: 10.1039/d1nr01768c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We elucidate the crucial role of the cetyl trimethylammonium bromide (CTAB) surfactant in the anisotropic growth mechanism of gold nano-bipyramids, nano-objects with remarkable optical properties and high tunability. Atomistic molecular dynamics simulations predict different surface coverages of the CTAB (positively charged) heads and their (bromide) counterions as function of the gold exposed surfaces. High concentration of CTAB surfactant promotes formation of gold nanograins in solution that work as precursors for the smooth anisotropic growth of more elongated nano-bipyramidal objects. Nanobipyramids feature higher index facets with respect to nanorods, allowing higher CTAB coverages that stabilize their formation and leading to narrower inter-micelles channels that smooth down their anisotropic growth. Absorption spectroscopy and scanning electron microscopy confirmed the formation of nanograins and demonstrated the importance of surfactant concentration on driving the growth towards nano-bipyramids rather than nanorods. The outcome explains the formation of the monodisperse bipyramidal nano-objects, the origin of their controlled shapes and sizes along with their remarkable stability.
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Affiliation(s)
- Santosh Kumar Meena
- Chemical Engineering and Process Development Division, CSIR-National Chemical Laboratory (NCL), Dr. HomiBhabha Road, Pune-411008, India.
| | - Frederic Lerouge
- Univ Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F69342, Lyon, France
| | - Patrice Baldeck
- Univ Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F69342, Lyon, France
| | - Chantal Andraud
- Univ Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F69342, Lyon, France
| | - Marco Garavelli
- Dipartimento di Chimica Industriale "Toso Montanari", Universitá degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy.
| | - Stephane Parola
- Univ Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F69342, Lyon, France
| | - Marialore Sulpizi
- Institute of Physics, Johannes Gutenberg University Mainz, Staudingerweg 7, 55099 Mainz, Germany.
| | - Ivan Rivalta
- Dipartimento di Chimica Industriale "Toso Montanari", Universitá degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy.
- Univ Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F69342, Lyon, France
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6
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Ganesan B, Fong KNK, Meena SK, Prasad P, Tong RKY. Impact of COVID-19 pandemic lockdown on occupational therapy practice and use of telerehabilitation - A cross sectional study. Eur Rev Med Pharmacol Sci 2021; 25:3614-3622. [PMID: 34002837 DOI: 10.26355/eurrev_202105_25845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE COVID-19 has become a global public health emergency affecting 223 countries and territories, and it drastically changed the life of public and health care delivery systems. Although many guidelines have been proposed to avoid infection from COVID-19 and to promote the use of telerehabilitation, there is still no clear answer for the current scenario and strategies of therapists' practice during the COVID-19 pandemic lockdown. This study aimed to explore the impact of COVID-19 lockdown on Occupational Therapists' (OTs) practice, the use of telerehabilitation strategies by OTs, and their employment and mental health. Also, this study aimed to explore the OTs perspective on the role of telerehabilitation during this pandemic lockdown. MATERIALS AND METHODS Online cross-sectional survey was conducted between April 2020 and May 2020. RESULTS 114 OTs completed the survey. The results of this study showed that 52.8% of therapists had stress and anxiety due to COVID-19 lockdown. We found that 60.7% of OTs (n=65) used telerehabilitation, versus 36.1% (n=39) before the lockdown. Telerehabilitation approaches were mostly implemented during this lockdown for children with autistic problems (66.6%), stroke (12.9%), cerebral palsy (6.4%), learning disabilities (9.6%), Parkinson's diseases (1.6%), and other medical conditions (2.8%). 10% of therapists reported that they lost their job, and 76% reported that this lockdown affected their income negatively. Overall, 87.8% of therapists reported that mobile technology was very useful to overcome the stress due to COVID-19 related lockdown, social isolation, and social distancing. CONCLUSIONS The COVID-19 pandemic lockdown experiences made us rethink the current approach of therapy services into alternative method (mixed mode) delivery of occupational therapy practice, which is including the combined method of video-based (telerehabilitation) consultation and face to face intervention.
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Affiliation(s)
- B Ganesan
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR.
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Ganesan B, Gowda T, Al-Jumaily A, Fong KNK, Meena SK, Tong RKY. Ambient assisted living technologies for older adults with cognitive and physical impairments: a review. Eur Rev Med Pharmacol Sci 2020; 23:10470-10481. [PMID: 31841201 DOI: 10.26355/eurrev_201912_19686] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The global number of people over the age of 60 years is expected to increase from 970 million to 2.1 billion in 2050 and 3.1 billion in 2100. About 80% of the aging population will be in the developing countries. Aging population may suffer from various physical, cognitive, and social problems, due to aging process such as impairment of physical related functions (decreased mobility and walking speed, falls, frailty, decreased walking speed, difficulties in basic, and instrumental activities of daily living), cognitive related functions (memory-related issues), sensory functions (hearing loss, cataracts and refractive errors, presbyopia, decreased vestibular function), behavioural and psychological disorders, social isolation issues, and poor quality of life. Over the period of the last few decades, emerging technologies such as internet of things (IoT), artificial intelligence (AI), sensors, cloud computing, wireless communication technologies, and assistive robotics have given the vision to develop various ambient or active assisted living (AAL) approaches for supporting an elderly people to live safely and independently in their living environment and participate in their daily and community activities, as well as supporting them to maintain their physical, mental health, and quality of their life. The aim of this paper is to review the use of Ambient or Active Assisted Living for older adults with physical, cognitive impairments, and their social participation.
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Affiliation(s)
- B Ganesan
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, SAR.
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8
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Denny MS, Parent LR, Patterson JP, Meena SK, Pham H, Abellan P, Ramasse QM, Paesani F, Gianneschi NC, Cohen SM. Transmission Electron Microscopy Reveals Deposition of Metal Oxide Coatings onto Metal–Organic Frameworks. J Am Chem Soc 2018; 140:1348-1357. [DOI: 10.1021/jacs.7b10453] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Michael S. Denny
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Lucas R. Parent
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Joseph P. Patterson
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
- Laboratory
of Materials and Interface Chemistry and Center of Multiscale Electron
Microscopy, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
| | - Santosh Kumar Meena
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Huy Pham
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Patricia Abellan
- SuperSTEM Laboratory, SciTech Daresbury Campus, Daresbury WA4 4AD, United Kingdom
| | - Quentin M. Ramasse
- SuperSTEM Laboratory, SciTech Daresbury Campus, Daresbury WA4 4AD, United Kingdom
| | - Francesco Paesani
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Nathan C. Gianneschi
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Seth M. Cohen
- Department
of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
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Meena SK, Goldmann C, Nassoko D, Seydou M, Marchandier T, Moldovan S, Ersen O, Ribot F, Chanéac C, Sanchez C, Portehault D, Tielens F, Sulpizi M. Nanophase Segregation of Self-Assembled Monolayers on Gold Nanoparticles. ACS Nano 2017; 11:7371-7381. [PMID: 28613838 DOI: 10.1021/acsnano.7b03616] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Nanophase segregation of a bicomponent thiol self-assembled monolayer is predicted using atomistic molecular dynamics simulations and experimentally confirmed. The simulations suggest the formation of domains rich in acid-terminated chains, on one hand, and of domains rich in amide-functionalized ethylene glycol oligomers, on the other hand. In particular, within the amide-ethylene glycol oligomers region, a key role is played by the formation of interchain hydrogen bonds. The predicted phase segregation is experimentally confirmed by the synthesis of 35 and 15 nm gold nanoparticles functionalized with several binary mixtures of ligands. An extensive study by transmission electron microscopy and electron tomography, using silica selective heterogeneous nucleation on acid-rich domains to provide electron contrast, supports simulations and highlights patchy nanoparticles with a trend toward Janus nano-objects depending on the nature of the ligands and the particle size. These results validate our computational platform as an effective tool to predict nanophase separation in organic mixtures on a surface and drive further exploration of advanced nanoparticle functionalization.
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Affiliation(s)
- Santosh Kumar Meena
- Institute of Physics, Johannes Gutenberg University Mainz , Staudingerweg 7, 55099 Mainz, Germany
| | - Claire Goldmann
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
| | - Douga Nassoko
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
- Ecole Normale Supérieure , Rue du 22 Octobre, Quartier du Fleuve, BP 241 Bamako, Mali
| | - Mahamadou Seydou
- Université Paris Diderot, Sorbonne Paris Cité, ITODYS, UMR 7086 CNRS , 15 rue J.-A. de Baïf, 75205 CEDEX 13 Paris, France
| | - Thomas Marchandier
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
| | - Simona Moldovan
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 du CNRS , 23 rue du Loess, 67087 Strasbourg, France
| | - Ovidiu Ersen
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 du CNRS , 23 rue du Loess, 67087 Strasbourg, France
| | - François Ribot
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
| | - Corinne Chanéac
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
| | - Clément Sanchez
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
| | - David Portehault
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
| | - Frederik Tielens
- Sorbonne Universités UPMC Univ Paris 06, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, Sorbonne Universités , 11 place Marcelin Berthelot, 75005 Paris, France
| | - Marialore Sulpizi
- Institute of Physics, Johannes Gutenberg University Mainz , Staudingerweg 7, 55099 Mainz, Germany
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Schäfer P, Lalitha A, Sebastian P, Meena SK, Feliu J, Sulpizi M, van der Veen MA, Domke KF. Trimesic acid on Cu in ethanol: Potential-dependent transition from 2-D adsorbate to 3-D metal-organic framework. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.01.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Meena SK, Sulpizi M. From Gold Nanoseeds to Nanorods: The Microscopic Origin of the Anisotropic Growth. Angew Chem Int Ed Engl 2016; 55:11960-4. [DOI: 10.1002/anie.201604594] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 07/21/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Santosh Kumar Meena
- Institute of Physics; Johannes Gutenberg University Mainz; Staudingerweg 7 55099 Mainz Germany
| | - Marialore Sulpizi
- Institute of Physics; Johannes Gutenberg University Mainz; Staudingerweg 7 55099 Mainz Germany
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12
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Affiliation(s)
- Santosh Kumar Meena
- Institute of Physics; Johannes Gutenberg University Mainz; Staudingerweg 7 55099 Mainz Germany
| | - Marialore Sulpizi
- Institute of Physics; Johannes Gutenberg University Mainz; Staudingerweg 7 55099 Mainz Germany
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13
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Meena SK, Celiksoy S, Schäfer P, Henkel A, Sönnichsen C, Sulpizi M. The role of halide ions in the anisotropic growth of gold nanoparticles: a microscopic, atomistic perspective. Phys Chem Chem Phys 2016; 18:13246-54. [PMID: 27118188 PMCID: PMC5159743 DOI: 10.1039/c6cp01076h] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 04/08/2016] [Indexed: 11/21/2022]
Abstract
We provide a microscopic view of the role of halides in controlling the anisotropic growth of gold nanorods through a combined computational and experimental study. Atomistic molecular dynamics simulations unveil that Br(-) adsorption is not only responsible for surface passivation, but also acts as the driving force for CTAB micelle adsorption and stabilization on the gold surface in a facet-dependent way. The partial replacement of Br(-) by Cl(-) decreases the difference between facets and the surfactant density. Finally, in the CTAC solution, no halides or micellar structures protect the gold surface and further gold reduction should be uniformly possible. Experimentally observed nanoparticle's growth in different CTAB/CTAC mixtures is more uniform and faster as the amount of Cl(-) increases, confirming the picture from the simulations. In addition, the surfactant layer thickness measured on nanorods exposed to CTAB and CTAC quantitatively agrees with the simulation results.
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Affiliation(s)
- Santosh Kumar Meena
- Institute of Physics , Johannes Gutenberg University Mainz , Staudingerweg 7 , 55099 Mainz , Germany . ; Fax: +49 6131 39 25441 ; Tel: +49 6131 39 23641
| | - Sirin Celiksoy
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Philipp Schäfer
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Andreas Henkel
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Carsten Sönnichsen
- Institute of Physical Chemistry , University of Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Marialore Sulpizi
- Institute of Physics , Johannes Gutenberg University Mainz , Staudingerweg 7 , 55099 Mainz , Germany . ; Fax: +49 6131 39 25441 ; Tel: +49 6131 39 23641
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Meena SK, Sulpizi M. Understanding the microscopic origin of gold nanoparticle anisotropic growth from molecular dynamics simulations. Langmuir 2013; 29:14954-61. [PMID: 24224887 DOI: 10.1021/la403843n] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We use molecular dynamics simulations in order to understand the microscopic origin of the asymmetric growth mechanism in gold nanorods. We provide the first atomistic model of different surfaces on gold nanoparticles in a growing electrolyte solution, and we describe the interaction of the metal with the surfactants, namely, cetyltrimethylammonium bromide (CTAB) and the ions. An innovative aspect is the inclusion of the role of the surfactants, which are explicitly modeled. We find that on all the investigated surfaces, namely, (111), (110), and (100), CTAB forms a layer of distorted cylindrical micelles where channels among micelles provide direct ion access to the surface. In particular, we show how AuCl2(-) ions, which are found in the growth solution, can freely diffuse from the bulk solution to the gold surface. We also find that the (111) surface exhibits a higher CTAB packing density and a higher electrostatic potential. Both elements would favor the growth of gold nanoparticles along the (111) direction. These findings are in agreement with the growth mechanisms proposed by the experimental groups of Murphy and Mulvaney.
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Affiliation(s)
- Santosh Kumar Meena
- Institute of Physics, Johannes Gutenberg University Mainz , Staudingerweg 7, 55099, Mainz, Germany
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