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Mace A, Laasonen K, Laaksonen A. Free energy barriers for CO2and N2in zeolite NaKA: an ab initio molecular dynamics approach. Phys Chem Chem Phys 2014; 16:166-72. [DOI: 10.1039/c3cp52821a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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52
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Melander M, Latsa V, Laasonen K. CO dissociation on iron nanoparticles: Size and geometry effects. J Chem Phys 2013; 139:164320. [DOI: 10.1063/1.4827078] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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53
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Takaluoma TT, Laasonen K, Laitinen RS. Molecular Dynamics Simulation of the Solid-State Topochemical Polymerization of S2N2. Inorg Chem 2013; 52:4648-57. [DOI: 10.1021/ic400273p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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54
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Laasonen K. Ab initio molecular dynamics. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2013; 924:29-42. [PMID: 23034744 DOI: 10.1007/978-1-62703-017-5_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In this chapter, an introduction to ab initio molecular dynamics (AIMD) has been given. Many of the basic concepts, like the Hellman-Feynman forces, the difference between the Car-Parrinello molecular dynamics and AIMD, have been explained. Also a very versatile AIMD code, the CP2K, has been introduced. On the application, the emphasis was on the aqueous systems and chemical reactions. The biochemical applications have not been discussed in depth.
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Ikäläinen S, Laasonen K. A DFT study of adsorption of perylene on clean and altered anatase (101) TiO2. Phys Chem Chem Phys 2013; 15:11673-8. [DOI: 10.1039/c3cp51295a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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56
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Huuppola M, Zhu Z, Johansson LS, Kontturi K, Laasonen K, Johans C. Anomalous dependence of particle size on supersaturation in the preparation of iron nanoparticles from iron pentacarbonyl. J Colloid Interface Sci 2012; 386:28-33. [PMID: 22921409 DOI: 10.1016/j.jcis.2012.06.041] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 06/08/2012] [Accepted: 06/16/2012] [Indexed: 10/28/2022]
Abstract
Iron nanoparticles were prepared by decomposing iron pentacarbonyl (Fe(CO)(5)) at 170-220°C in the presence of amine surfactant and alkane solvent and under 1-12 bar carbon monoxide (CO) pressure. It was found that the amine not only acted as a stabilizer for the growing particles but also had a critical role as a promotor in the decomposition reaction. Relatively small changes in the CO pressure had anomalous effects on the particle size distribution. Typically, monodisperse particles were obtained at 1 bar, while pressures in the 2-6 bar range led to wider and even bimodal size distributions due to an emergence of smaller particles. At still higher pressures, the larger particle size disappeared leaving the distribution monodisperse again. The CO pressure, at which the bimodal transition took place, increased with the reaction temperature. Polycrystalline particles were formed at lower pressures and monocrystalline particles at higher pressures. This indicates that increased CO pressure inhibits aggregation.
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Lanzani G, Sarpola A, Saukkoriipi J, Laasonen K, Morrison CA, Slater B, Rämö J, Pehkonen SO. Study of the stability of aluminium trimeric clusters in aqueous solutions. MOLECULAR SIMULATION 2012. [DOI: 10.1080/08927022.2012.674209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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58
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Peljo P, Murtomäki L, Kallio T, Xu HJ, Meyer M, Gros CP, Barbe JM, Girault HH, Laasonen K, Kontturi K. Biomimetic Oxygen Reduction by Cofacial Porphyrins at a Liquid–Liquid Interface. J Am Chem Soc 2012; 134:5974-84. [DOI: 10.1021/ja3004914] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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59
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Wang X, Pehkonen SO, Rämö J, Väänänen M, Highfield JG, Laasonen K. Experimental and computational studies of nitrogen doped Degussa P25 TiO2: application to visible-light driven photo-oxidation of As(iii). Catal Sci Technol 2012. [DOI: 10.1039/c2cy00486k] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mareš J, Liimatainen H, Laasonen K, Vaara J. Solvation Structure and Dynamics of Ni2+(aq) from First Principles. J Chem Theory Comput 2011; 7:2937-46. [DOI: 10.1021/ct200320z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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61
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Susi T, Lanzani G, Nasibulin AG, Ayala P, Jiang T, Bligaard T, Laasonen K, Kauppinen EI. Mechanism of the initial stages of nitrogen-doped single-walled carbon nanotube growth. Phys Chem Chem Phys 2011; 13:11303-7. [DOI: 10.1039/c1cp20454h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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62
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Pesonen H, Wuorimaa A, Jokela R, Aksela R, Laasonen K. Synthesis, structure, and complexation properties of hydroxybenzyl analogs of diethylenetriaminepentaacetic acid. J COORD CHEM 2010. [DOI: 10.1080/00958972.2010.499936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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63
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Saukkoriipi J, Laasonen K. Theoretical Study of the Hydrolysis of Pentameric Aluminum Complexes. J Chem Theory Comput 2010. [DOI: 10.1021/ct900670a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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64
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Pesonen H, Aksela R, Laasonen K. Density Functional Complexation Study of Metal Ions with Cysteine. J Phys Chem A 2009; 114:466-73. [DOI: 10.1021/jp905733d] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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65
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Saukkoriipi JJ, Laasonen K. Density Functional Studies of the Hydrolysis of Aluminum (Chloro)Hydroxide in Water with CPMD and COSMO. J Phys Chem A 2008; 112:10873-80. [DOI: 10.1021/jp804176v] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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66
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Jalkanen JP, Halonen M, Fernández-Torre D, Laasonen K, Halonen L. A Computational Study of the Adsorption of Small Ag and Au Nanoclusters on Graphite. J Phys Chem A 2007; 111:12317-26. [DOI: 10.1021/jp074969m] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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67
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Torpo L, Kurtén T, Vehkamäki H, Laasonen K, Sundberg MR, Kulmala M. Significance of Ammonia in Growth of Atmospheric Nanoclusters. J Phys Chem A 2007; 111:10671-4. [PMID: 17914768 DOI: 10.1021/jp0741307] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We apply accurate quantum chemistry methods to study the thermochemistry of molecular clusters containing ammonia, water, and sulfuric acid and investigate initial reaction steps in atmospheric nucleation by calculating free energies for the related reactions. The results indicate that ammonia is a key reactant enhancing the growth of small water-sulfuric acid clusters in atmospheric conditions. The role of ammonia becomes significant when the nanoclusters contain more than one or two sulfuric acid molecules. This implies a lower limit of 1:3 for the NH3/H2SO4 mole ratio of atmospheric sulfuric acid-water-ammonia clusters.
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SÄlli E, Jalkanen JP, Laasonen K, Halonen L. Computational study of adsorption and the vibrational properties of water on the Cu(110) surface. Mol Phys 2007. [DOI: 10.1080/00268970701420516] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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69
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Pesonen H, Aksela R, Laasonen K. Density functional complexation study of metal ions with amino polycarboxylic acid ligands: EDDHA and HBED in comparison to EDTA, EDDS, ODS, and ISA. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2006.10.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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70
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Kurtén T, Torpo L, Ding CG, Vehkamäki H, Sundberg MR, Laasonen K, Kulmala M. A density functional study on water-sulfuric acid-ammonia clusters and implications for atmospheric cluster formation. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007391] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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71
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Haiminen N, Gionis A, Laasonen K. Algorithms for unimodal segmentation with applications to unimodality detection. Knowl Inf Syst 2006. [DOI: 10.1007/s10115-006-0053-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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72
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Laasonen K, Larrucea J, Sillapää A. Ab initio molecular dynamics study of a mixture of HF(aq) and HCl(aq). J Phys Chem B 2006. [PMID: 16800604 DOI: 10.1021/jp054876] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have studied a mixture of HF and HCl molecules in water using Car-Parrinello ab initio molecular dynamics (CPMD). We have done simulations with 1 HF and 3 HCl molecules, 3 HF and 4 HCl, 6 HF and 8 HCl (6/8 simulation), and 14 HF molecules. All simulations consist of 32 molecules, and they were 10-96 ps long. The HF dissociation probability was around 30%, and HCl's was more than 90%. The solvation of the HF molecule was much better than the solvation of HCl. The solvation environment of F, both the F- ion and the F in HF, did not depend much on the acids concentration, whereas the Cl coordination numbers were rather sensitive to the concentration. In the 6/8 simulation, all XH-Y (X, Y = F, Cl) type molecules were observed and the FH-F was the most probable. In general, the molecular structures in mixed aqueous acid systems were similar to the pure HF(aq) and HCl(aq) systems.
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Laasonen K, Larrucea J, Sillapää A. Ab Initio Molecular Dynamics Study of a Mixture of HF(aq) and HCl(aq)†. J Phys Chem B 2006; 110:12699-706. [PMID: 16800604 DOI: 10.1021/jp054876+] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have studied a mixture of HF and HCl molecules in water using Car-Parrinello ab initio molecular dynamics (CPMD). We have done simulations with 1 HF and 3 HCl molecules, 3 HF and 4 HCl, 6 HF and 8 HCl (6/8 simulation), and 14 HF molecules. All simulations consist of 32 molecules, and they were 10-96 ps long. The HF dissociation probability was around 30%, and HCl's was more than 90%. The solvation of the HF molecule was much better than the solvation of HCl. The solvation environment of F, both the F- ion and the F in HF, did not depend much on the acids concentration, whereas the Cl coordination numbers were rather sensitive to the concentration. In the 6/8 simulation, all XH-Y (X, Y = F, Cl) type molecules were observed and the FH-F was the most probable. In general, the molecular structures in mixed aqueous acid systems were similar to the pure HF(aq) and HCl(aq) systems.
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Pesonen H, Sillanpää A, Aksela R, Laasonen K. Density functional complexation study of metal ions with poly(carboxylic acid) ligands. Part 2. Poly(acrylic acid-co-maleic acid), poly(methyl vinyl ether-co-maleic acid), and poly(epoxy succinic acid). POLYMER 2005. [DOI: 10.1016/j.polymer.2005.10.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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75
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Pesonen H, Sillanpää A, Aksela R, Laasonen K. Density functional complexation study of metal ions with poly(carboxylic acid) ligands. Part 1. Poly(acrylic acid) and poly(α-hydroxy acrylic acid). POLYMER 2005. [DOI: 10.1016/j.polymer.2005.10.069] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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