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Tsakova V. Electrochemistry born in Bulgaria: the wide spread of ripened seeds at the transition to the twenty-first century. J Solid State Electrochem 2023. [DOI: 10.1007/s10008-023-05397-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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2
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In memoriam of Alexander Milchev. J Solid State Electrochem 2022. [DOI: 10.1007/s10008-022-05336-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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3
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Simulation of Diffusion-Controlled Growth of Interdependent Nuclei under Potentiostatic Conditions. MATERIALS 2022; 15:ma15103603. [PMID: 35629634 PMCID: PMC9147730 DOI: 10.3390/ma15103603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 05/11/2022] [Accepted: 05/16/2022] [Indexed: 12/10/2022]
Abstract
The problem of diffusion-controlled growth following an instantaneous nucleation event was studied within the framework of a new numerical model, considering the spatial distribution of hemispherical nuclei on the electrode surface and the mutual influence of growing nuclei via the collision of 3D diffusion fields. The simulation of the diffusion-controlled growth of hexagonal and random ensembles was performed at the overpotential-dependent number density of nuclei. The diffusion flow to each nucleus within a random ensemble was simulated by the finite difference method using the derived analytical expressions for the surface areas and the volumes formed at the intersection of 3D diffusion fields with the side faces of a virtual right prism with a Voronoi polygon base. The implementation of this approach provides an accurate calculation of concentration profiles, time dependences of the size of nuclei, and current transients. The results, including total current density transients, growth exponents, and nucleus size distribution, were compared with models developed within the concept of planar diffusion zones, the mean-field approximation and the Brownian dynamics simulation method, as well as with experimental data from the literature. The prospects of the model for studying the initial stages of electrocrystallization were discussed.
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Garcia-Quintana L, Ortiz-Vitoriano N, Zhu H, Nolis GM, Herrero-Martín J, Echeverría M, López Del Amo JM, Forsyth M, Bond AM, Howlett PC, Pozo-Gonzalo C. Unveiling the Impact of the Cations and Anions in Ionic Liquid/Glyme Hybrid Electrolytes for Na-O 2 Batteries. ACS APPLIED MATERIALS & INTERFACES 2022; 14:4022-4034. [PMID: 35019264 DOI: 10.1021/acsami.1c20257] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
A series of hybrid electrolytes composed of diglyme and ionic liquids (ILs) have been investigated for Na-O2 batteries, as a strategy to control the growth and purity of the discharge products during battery operation. The dependence of chemical composition of the ILs on the size, purity, and distribution of the discharge products has been evaluated using a wide range of experimental and spectroscopic techniques. The morphology and composition of the discharge products found in the Na-O2 cells have a complex dependence on the physicochemical properties of the electrolyte as well as the speciation of the Na+ and superoxide radical anion. All of these factors control the nucleation and growth phenomena as well as electrolyte stability. Smaller discharge particle sizes and largely homogeneous (2.7 ± 0.5 μm) sodium superoxide (NaO2) crystals with only 9% of side products were found in the hybrid electrolyte containing the pyrrolidinium IL with a linear alkyl chain. The long-term cyclability of Na-O2 batteries with high Coulombic efficiency (>90%) was obtained for this electrolyte with fewer side products (20 cycles at 0.5 mA h cm-2). In contrast, rapid failure was observed with the use of the phosphonium-based electrolyte, which strongly stabilizes the superoxide anion. A high discharge capacity (4.46 mA h cm-2) was obtained for the hybrid electrolyte containing the pyrrolidinium-based IL bearing a linear alkyl chain with a slightly lower value (3.11 mA h cm-2) being obtained when the hybrid electrolyte contained similar pyrrolidinium-based IL bearing an alkoxy chain.
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Affiliation(s)
- Laura Garcia-Quintana
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Geelong, Victoria 3200, Australia
| | - Nagore Ortiz-Vitoriano
- Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Alava, Albert Einstein 48, Vitoria-Gasteiz 01510, Spain
- Ikerbasque, Basque Foundation for Science, María Díaz de Haro 3, Bilbao 48013, Spain
| | - Haijin Zhu
- Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia
| | - Gene M Nolis
- Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Alava, Albert Einstein 48, Vitoria-Gasteiz 01510, Spain
- ALBA Synchrotron, CELLS, Cerdanyola de Vallès 08290, Spain
| | | | - María Echeverría
- Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Alava, Albert Einstein 48, Vitoria-Gasteiz 01510, Spain
| | - Juan Miguel López Del Amo
- Centre for Cooperative Research on Alternative Energies (CIC energiGUNE), Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Alava, Albert Einstein 48, Vitoria-Gasteiz 01510, Spain
| | - Maria Forsyth
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Geelong, Victoria 3200, Australia
- Ikerbasque, Basque Foundation for Science, María Díaz de Haro 3, Bilbao 48013, Spain
| | - Alan M Bond
- ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Patrick C Howlett
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Geelong, Victoria 3200, Australia
| | - Cristina Pozo-Gonzalo
- ARC Centre of Excellence for Electromaterials Science, Institute for Frontier Materials, Deakin University, Geelong, Victoria 3200, Australia
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Gramatikov D, Hadzi Jordanov S. Extraordinary regularities of zinc dendrites’ growth under appropriate electrolysis conditions. JOURNAL OF THE SERBIAN CHEMICAL SOCIETY 2022. [DOI: 10.2298/jsc220122029g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A case study is given of dendritic growth during zinc electrolysis in
conditions that promote it. Subject of the main interest was how the
electrolysis parameters affect the duration of dendrites life. The selected
set of parameters did provide a surprisingly regular dendrite?s life, i.e.
period from start of the electrolysis until dendrites detachment from the
cathode. Dendrite?s growth did proceed with lowering of the zinc current
efficiency, and the end of life was manifested by intensive hydrogen
evolution due to corrosion of detached zinc deposit in the acid electrolyte.
Current efficiency was successfully followed by the bubble counting
technique, invented especially for kinetic studies of gas including
reactions. The acquired results on dendrites? life duration were so exact
that it was easy to unify all five mono-variable dependencies into one
five-variable expression. The calculated values of life duration did differ
from the measured ones by only ?3%! This is a proof that the developed
expression accurately presents the real nature of dendritic growth under the
applied conditions, i.e. 0.5 to 2 M zinc (II) ions, 0.41 to 3.06 M H2SO4,
10 to 2500 mg dm-3 copper (II) ions, 0.14 to 14 g dm-3
hexamethylenetetramine, and 4.25 to 103 mA dm-2 current density. The
eventual broader region of Zn dendrites? strict regular growth is not
excluded.
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Affiliation(s)
- Dimitar Gramatikov
- Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University, Skopje, Republic of North Macedonia + Faculty of Economy, Ss. Cyril and Methodius University, Skopje, Republic of North Macedonia
| | - Svetomir Hadzi Jordanov
- Faculty of Technology and Metallurgy, Ss. Cyril and Methodius University, Skopje, Republic of North Macedonia
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Isaev VA, Grishenkova OV, Kosov AV, Semerikova OL, Zaikov Y. Simulation of 3D Electrochemical Phase Formation: Mixed Growth Control. MATERIALS 2021; 14:ma14216330. [PMID: 34771855 PMCID: PMC8585326 DOI: 10.3390/ma14216330] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/14/2021] [Accepted: 10/20/2021] [Indexed: 11/16/2022]
Abstract
Processes of nucleation and growth largely determine the structure and properties of thin films obtained by electrodeposition on foreign substrates. Theoretical aspects of the initial stages of electrochemical phase formation under constant and variable overpotentials are considered in this work. Simulation of multiple nucleation with mixed (charge transfer, and diffusion) controlled growth was performed for three cases (cyclic voltammetry, potentiostatic electrodeposition, and galvanostatic electrodeposition). The influence of the bulk concentration of depositing ions and the exchange current density at the electrolyte/nucleus interface on cyclic voltammograms (CVs), transients of current and overpotential, as well as the number and size of non-interacting new-phase nuclei was analyzed. It is found that, under galvanostatic conditions, the number of nuclei decreases as the concentration of depositing ions increases due to a more rapid decrease in overpotential. The proposed model was applied to determine the diffusion coefficient, exchange current density, and transfer coefficient considering the experimental CV.
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Kosov AV, Grishenkova OV, Semerikova OL, Isaev VA, Zaikov YP. On the theory of cyclic voltammetry for multiple nucleation and growth: Scan rate influence. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115056] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Gupta A, Srivastava C. Single Atom Nucleation of Cobalt over Graphene Oxide: Theory and Experimental Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7824-7834. [PMID: 32564608 DOI: 10.1021/acs.langmuir.0c00798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Nucleation and growth mechanism of Co electrodeposition over graphene oxide (GO) was studied using cyclic voltammetry (CV) and chronoamperometry techniques. The studies were performed over an aqueous electrolyte containing 10 mM CoSO4·7H2O maintained at an initial pH of 2.5. CV studies established that the deposition mechanism was diffusion-controlled and irreversible. Chronoamperometry studies revealed the presence of three concurrent processes: an initial adsorption current, which indicated adatom layer formation, 3D nucleation and growth of Co islands over GO, and hydrogen evolution over the deposited Co nanoclusters. It was observed that the nucleation rate increased with increasing the overpotential (η) for deposition (from 2.71 × 104 cm-2 s-1 at η = 0.35 V to 3.62 × 106 cm-2 s-1 at η = 0.90 V). Application of the classical theory of nucleation over the chronoamperometry results suggested that the free energy of formation of the critical nucleus was lower than room temperature thermal energy. This indicated that the nucleation and growth process was not activation-controlled but rather a kinetically controlled process. Application of Milchev's atomistic theory revealed that every single atom of Co deposited over the GO sheet was a supercritical nucleus that could grow into a cluster irreversibly.
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Affiliation(s)
- Abhay Gupta
- Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
| | - Chandan Srivastava
- Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
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Isaev VA, Grishenkova OV, Zaykov YP. Theoretical modeling of electrochemical nucleation and growth of a single metal nanocluster on a nanoelectrode. RSC Adv 2020; 10:6979-6984. [PMID: 35493918 PMCID: PMC9049746 DOI: 10.1039/d0ra00608d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 02/08/2020] [Indexed: 12/31/2022] Open
Abstract
Theory of the initial stages of electrochemical formation and growth of a single metal nanocluster on an indifferent nanoelectrode has been developed and analyzed. General theoretical time dependences of the current and nanocluster size have been presented for the case of diffusion controlled growth at potentio- and galvanostatic deposition, and cyclic voltammetry. The models of formation and growth of a single nanocluster on a nanoelectrode are presented for three basic electrochemical methods (cyclic voltammetry, potentiostatic and galvanostatic electrodeposition).![]()
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Affiliation(s)
- Vladimir A Isaev
- Institute of High Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences 20 Academicheskaya Str. 620137 Ekaterinburg Russia
| | - Olga V Grishenkova
- Institute of High Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences 20 Academicheskaya Str. 620137 Ekaterinburg Russia
| | - Yurii P Zaykov
- Institute of High Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences 20 Academicheskaya Str. 620137 Ekaterinburg Russia .,Ural Federal University 19 Mira Str. 620002 Ekaterinburg Russia
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Avchukir K, Yessaly N, Burkitbayeva B. Electrodeposition of Indium on Glassy Carbon from Tetrabutylammonium Chloride Containing Solutions. EURASIAN CHEMICO-TECHNOLOGICAL JOURNAL 2019. [DOI: 10.18321/ectj826] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The effectiveness of tetrabutylammonium chloride (TBACh) as inhibition additive of dendritic growth of indium has been investigated by means of cyclic voltammetry and chronoamperometry methods. The rotating disk electrode (RDE) method allowed the calculation of the diffusion coefficient of In3+ ions using the Levich equation, at 25 °C is 4.41 × 10–6 cm2/s. Diffusion coefficient of indium ions determined by chronoamperometry using the Cottrell law (6.63 × 10–6 cm2/s) is in consistent with the value calculated by the Levich equation. The addition of tetrabutylammonium ions to the electrolyte reduces the diffusion coefficient and inhibits the cathodic process by increasing the activation energy from 10.5 kJ/mol to 20.7 kJ/mol. The indium nucleation and growth on glassy carbon in chloride solutions was studied by single potentiostatic pulse techniques. The nucleation mechanism was evaluated by analyzing the influence of different TBACh ion concentration and applied potentials. The electrocrystallization mechanisms were determined by fitting the experimental non-dimensional current transients on the basis nucleation and growth model developed by Scharifker-Hills. The type of nucleation corresponding to the progressive three-dimensional nucleation with diffusion control is determined. Based on theoretical models of 3D multiple nucleation from the potentiostatic current transients were calculated nucleation characteristics, such as the stationary nucleation rate, saturation nucleus density and the average grains radius of indium deposits. The leveling action of TBACh on the electrodeposition of indium at concentration of 10-4 M was found.
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Isaev VA, Grishenkova OV, Zaykov YP. On the theory of 3D multiple nucleation with kinetic controlled growth. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.04.051] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Mamme MH, Köhn C, Deconinck J, Ustarroz J. Numerical insights into the early stages of nanoscale electrodeposition: nanocluster surface diffusion and aggregative growth. NANOSCALE 2018; 10:7194-7209. [PMID: 29620775 DOI: 10.1039/c7nr08529j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Fundamental understanding of the early stages of electrodeposition at the nanoscale is key to address the challenges in a wide range of applications. Despite having been studied for decades, a comprehensive understanding of the whole process is still out of reach. In this work, we introduce a novel modelling approach that couples a finite element method (FEM) with a random walk algorithm, to study the early stages of nanocluster formation, aggregation and growth, during electrochemical deposition. This approach takes into account not only electrochemical kinetics and transport of active species, but also the surface diffusion and aggregation of adatoms and small nanoclusters. The simulation results reveal that the relative surface mobility of the nanoclusters compared to that of the adatoms plays a crucial role in the early growth stages. The number of clusters, their size and their size dispersion are influenced more significantly by nanocluster mobility than by the applied overpotential itself. Increasing the overpotential results in shorter induction times and leads to aggregation prevalence at shorter times. A higher mobility results in longer induction times, a delayed transition from nucleation to aggregation prevalence, and as a consequence, a larger surface coverage of smaller clusters with a smaller size dispersion. As a consequence, it is shown that a classical first-order nucleation kinetics equation cannot describe the evolution of the number of clusters with time, N(t), in potentiostatic electrodeposition. Instead, a more accurate representation of N(t) is provided. We show that an evaluation of N(t), which neglects the effect of nanocluster mobility and aggregation, can induce errors of several orders of magnitude in the determination of nucleation rate constants. These findings are extremely important towards evaluating the elementary electrodeposition processes, considering not only adatoms, but also nanoclusters as building blocks.
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Affiliation(s)
- Mesfin Haile Mamme
- Vrije Universiteit Brussel (VUB), Research Group Electrochemical and Surface Engineering (SURF), Pleinlaan 2, 1050 Brussels, Belgium.
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Legkaya DA, Solov’eva ND, Yakovlev AV. Physicomechanical properties of nickel coating deposited from sulfate nickel plating electrolyte using preliminary underpotential deposition. RUSS J APPL CHEM+ 2018. [DOI: 10.1134/s1070427217090129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Sebastián P, Botello LE, Vallés E, Gómez E, Palomar-Pardavé M, Scharifker BR, Mostany J. Three-dimensional nucleation with diffusion controlled growth: A comparative study of electrochemical phase formation from aqueous and deep eutectic solvents. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.12.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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On the theory of cyclic voltammetry for formation and growth of single metal cluster. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3425-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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17
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Milchev A. Electrochemical phase formation: classical and atomistic theoretical models. NANOSCALE 2016; 8:13867-13872. [PMID: 27108683 DOI: 10.1039/c6nr02354a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The process of electrochemical phase formation at constant thermodynamic supersaturation is considered in terms of classical and atomistic nucleation theories. General theoretical expressions are derived for important thermodynamic and kinetic quantities commenting also upon the correlation between the existing theoretical models and experimental results. Progressive and instantaneous nucleation and growth of multiple clusters of the new phase are briefly considered, too.
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Affiliation(s)
- Alexander Milchev
- Evgeni Budevski Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 10, 1113 Sofia, Bulgaria.
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20
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Sotskaya NV, Sapronova LV, Dolgikh OV. Kinetics of nickel electrocrystallization from serine-containing electrolytes. RUSS J ELECTROCHEM+ 2014. [DOI: 10.1134/s1023193514120106] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Velmurugan J, Noël JM, Mirkin MV. Nucleation and growth of mercury on Pt nanoelectrodes at different overpotentials. Chem Sci 2014. [DOI: 10.1039/c3sc52488d] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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22
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Novikova VV, Starodubova SP, Chaika MY, Kravchenko TA. Electroreduction of molecular oxygen on carbon electrode modified by dispersed silver. RUSS J ELECTROCHEM+ 2013. [DOI: 10.1134/s1023193513030117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Electrochemical nucleation of palladium on graphene: A kinetic study with an emphasis on hydrogen co-reduction. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2012.09.092] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sevonkaev I, Privman V, Goia D. Synthesis of dispersed metal particles for applications in photovoltaics, catalysis, and electronics. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1954-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Isaev VA, Grishenkova OV, Semerikova OL. Three-dimensional nucleation and growth under galvanostatic conditions. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1911-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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26
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Gamburg Y. Some novel efforts to describe the nucleation and growth at electrodeposition. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1917-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Electrochemical nucleation: comparison test of classical and atomistic nucleation models. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1872-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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28
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Agmo Hernández V. The theory of metal electronucleation applied to the study of fundamental properties of liposomes. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1874-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Velmurugan J, Noël JM, Nogala W, Mirkin MV. Nucleation and growth of metal on nanoelectrodes. Chem Sci 2012. [DOI: 10.1039/c2sc21005c] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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31
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Gorshkov V, Zavalov O, Atanassov PB, Privman V. Morphology of nanoclusters and nanopillars formed in nonequilibrium surface growth for catalysis applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8554-8561. [PMID: 21082805 DOI: 10.1021/la103113f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We consider growth of nanoclusters and nanopillars in a model of surface deposition and restructuring yielding morphologies of interest in designing catalysis applications. Kinetic Monte Carlo numerical modeling yields examples of the emergence of face centered cubic (fcc) symmetry surface features in Pt-type metal nanostructures, allowing evaluation of the fraction of the resulting active sites with desirable properties, such as (111)-like coordination, as well as suggesting the optimal growth regimes.
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Affiliation(s)
- Vyacheslav Gorshkov
- Institute of Physics, National Academy of Sciences, 46 Nauky Avenue, Kiev 03028, Ukraine
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Agmo Hernández V, Karlsson G, Edwards K. Intrinsic heterogeneity in liposome suspensions caused by the dynamic spontaneous formation of hydrophobic active sites in lipid membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:4873-4883. [PMID: 21391645 DOI: 10.1021/la1049919] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The spontaneous, dynamic formation of hydrophobic active sites in lipid bilayer membranes is studied and characterized. It is shown that the rates of formation and consumption of these active sites control at least two important properties of liposomes: their affinity for hydrophobic surfaces and the rate by which they spontaneously release encapsulated molecules. The adhesion and spreading of liposomes onto hydrophobic polystyrene nanoparticles and the spontaneous leakage of an encapsulated fluorescent dye were monitored for different liposome compositions employing Cryo-TEM, DLS, and fluorescence measurements. It was observed that an apparently homogeneous, monodisperse liposome suspension behaves as if composed by two different populations: a fast leaking population that presents affinity for the hydrophobic substrate employed, and a slow leaking population that does not attach immediately to it. The results reported here suggest that the proportion of liposomes in each population changes over time until a dynamic equilibrium is reached. It is shown that this phenomenon can lead to irreproducibility in, for example, spontaneous leakage experiments, as extruded liposomes leak much faster just after preparation than 24 h afterward. Our findings account for discrepancies in several experimental results reported in the literature. To our knowledge, this is the first systematic study addressing the issue of an existing intrinsic heterogeneity of liposome suspensions.
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Affiliation(s)
- Víctor Agmo Hernández
- Department of Physical and Analytical Chemistry, Uppsala University, Husargatan 3, Box 579, 75123, Uppsala, Sweden.
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Licona-Sánchez TDJ, Álvarez-Romero GA, Mendoza-Huizar LH, Galán-Vidal CA, Palomar-Pardavé M, Romero-Romo M, Herrera-Hernández H, Uruchurtu J, Juárez-García JM. Nucleation and Growth Kinetics of Electrodeposited Sulfate-Doped Polypyrrole: Determination of the Diffusion Coefficient of SO42− in the Polymeric Membrane. J Phys Chem B 2010; 114:9737-43. [DOI: 10.1021/jp102676q] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | - J. M. Juárez-García
- Laboratorio de Microanálisis, Centro Nacional de Metrología, km 4.5 de la Carretera a los Cues, municipio de El Marqués, Querétaro, México
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Dale SEC, Bending SJ, Peter LM. Real-time in situ atomic force microscopy imaging of bismuth crystal growth. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:11228-11231. [PMID: 19788205 DOI: 10.1021/la9022536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have performed real-time atomic force microscopy (AFM) imaging of bismuth crystals that were grown under electrochemical control at low overpotentials to ensure a slow growth rate and allow in situ observation of the growth. A two step chronoamperometric potential was applied to a boron-doped diamond (BDD) working electrode with a short high overpotential, -0.4 V (2 s), to nucleate the bismuth, and then a long low overpotential for slow growth, -0.32 V (4.4 h). Growth rates of individual crystals and detailed growth mechanisms could be followed in real time because of the slow crystal growth. The close proximity of the AFM tip and tip holder to the working electrode appears to hinder the diffusion of bismuth to the BDD surface, as evidenced by the significantly lower density of crystals under the cantilever as compared to the rest of the electrode, therefore slowing down the growth process.
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Affiliation(s)
- Sara E C Dale
- Department of Physics, University of Bath, Bath, BA2 7AY, UK.
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Hernández VA, Milchev A, Scholz F. Study of the temporal distribution of the adhesion-spreading events of liposomes on a mercury electrode. J Solid State Electrochem 2009. [DOI: 10.1007/s10008-008-0770-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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The overall adhesion-spreading process of liposomes on a mercury electrode is controlled by a mixed diffusion and reaction kinetics mechanism. J Solid State Electrochem 2008. [DOI: 10.1007/s10008-008-0639-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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