Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Sami, Kaappa"'
Autor:
Suvi Santa-aho, Mari Honkanen, Sami Kaappa, Lucio Azzari, Andrey Saren, Kari Ullakko, Lasse Laurson, Minnamari Vippola
Publikováno v:
Materials & Design, Vol 234, Iss , Pp 112308- (2023)
Two steels, ferrite and ferrite-pearlite were thoroughly characterized by a multi-instrumental microscopy techniques to get detailed information about their microstructure and magnetic structure. Microstructural features act as pinning sites for the
Externí odkaz:
https://doaj.org/article/4db6ea683915466e8af123fe9553e47a
Autor:
Sami Kaappa, Lasse Laurson
Publikováno v:
Physical Review Research, Vol 5, Iss 2, p L022006 (2023)
Barkhausen noise in disordered ferromagnets is typically understood to originate primarily from jerky field-driven motion of domain walls. We study the magnetization reversal process in disordered permalloy thin films using micromagnetic simulations
Externí odkaz:
https://doaj.org/article/39a7262e00e7456e98af96a5677930df
Autor:
Qin Zhou, Sami Kaappa, Sami Malola, Hui Lu, Dawei Guan, Yajuan Li, Haochen Wang, Zhaoxiong Xie, Zhibo Ma, Hannu Häkkinen, Nanfeng Zheng, Xueming Yang, Lansun Zheng
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-8 (2018)
Translating high-resolution imaging methods to the curved organic surface of a nanoparticle has been challenging. Here, the authors are able to spatially resolve the sub-molecular surface details of a silver nanocluster by comparing scanning tunnelin
Externí odkaz:
https://doaj.org/article/ae2cfa44f86d4fa593d1bfddbb2e9397
Autor:
Liane S. Slaughter, Kevin M. Cheung, Sami Kaappa, Huan H. Cao, Qing Yang, Thomas D. Young, Andrew C. Serino, Sami Malola, Jana M. Olson, Stephan Link, Hannu Häkkinen, Anne M. Andrews, Paul S. Weiss
Publikováno v:
Beilstein Journal of Nanotechnology, Vol 8, Iss 1, Pp 2648-2661 (2017)
The supported monolayer of Au that accompanies alkanethiolate molecules removed by polymer stamps during chemical lift-off lithography is a scarcely studied hybrid material. We show that these Au–alkanethiolate layers on poly(dimethylsiloxane) (PDM
Externí odkaz:
https://doaj.org/article/46712c01c23747ff9ebbc35a5e5ede2b
Autor:
Shui-Chao Lin, Nanfeng Zheng, Boon K. Teo, Hannu Häkkinen, Ying-Zi Han, Guocheng Deng, Sami Kaappa, Hui Shen, Tong-De Tan, Sami Malola
Publikováno v:
Angewandte Chemie International Edition. 58:17731-17735
Surface organic ligands play a critical role in stabilizing atomically precise metal nanoclusters in solutions. However, it is still challenging to prepare highly robust ligated metal nanoclusters that are surface-active for liquid-phase catalysis wi
Publikováno v:
Kaappa, S, Larsen, C & Jacobsen, K W 2021, ' Atomic Structure Optimization with Machine-Learning Enabled Interpolation between Chemical Elements ', Physical Review Letters, vol. 127, no. 16, 166001 . https://doi.org/10.1103/PhysRevLett.127.166001
We introduce a computational method for global optimization of structure and ordering in atomic systems. The method relies on interpolation between chemical elements, which is incorporated in a machine-learning structural fingerprint. The method is b
Publikováno v:
Kaappa, S, Del Río, E G & Jacobsen, K W 2021, ' Global optimization of atomic structures with gradient-enhanced Gaussian process regression ', Physical Review B, vol. 103, no. 17, 174114 . https://doi.org/10.1103/PhysRevB.103.174114
Determination of atomic structures is a key challenge in the fields of computational physics and materials science, as a large variety of mechanical, chemical, electronic, and optical properties depend sensitively on structure. Here, we present a glo
Publikováno v:
The Journal of Physical Chemistry C. 123:20655-20663
There is a widespread interest to design ambient-stable gold nanoparticles with tailored physicochemical properties for applications in several areas such as plasmonics, nanomedicine, catalysis, bi...
Autor:
Hannu Häkkinen, J. Daniel Padmos, Renee W. Y. Man, Sami Kaappa, Ryohei Tomihara, Shinjiro Takano, Sami Malola, Cathleen M. Crudden, Kennedy Ayoo, Phillip J. Unsworth, Cao-Thang Dinh, Masakazu Nambo, Patrick J. Garrett, Tatsuya Tsukuda, Kimberly M. Osten, Edward H. Sargent, J. Hugh Horton, Mina R. Narouz, Kirsi Salorinne
Publikováno v:
Nature Chemistry. 11:419-425
Magic-number gold nanoclusters are atomically precise nanomaterials that have enabled unprecedented insight into structure-property relationships in nanoscience. Thiolates are the most common ligand, binding to the cluster via a staple motif in which
Autor:
Karsten Wedel Jacobsen, José A. Garrido Torres, Thomas Bligaard, Sami Kaappa, Estefanía Garijo del Río
Publikováno v:
Garijo del Rio, E, Kaappa, S J, Garrido Torres, J A, Bligaard, T & Jacobsen, K W 2020, ' Machine learning with bond information for local structure optimizations in surface science ', Journal of Chemical Physics, vol. 153, no. 23, 234116 . https://doi.org/10.1063/5.0033778
Local optimization of adsorption systems inherently involves different scales: within the substrate, within the molecule, and between the molecule and the substrate. In this work, we show how the explicit modeling of different characteristics of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28f649f82ec0a5379807821119c534fc
http://arxiv.org/abs/2010.09497
http://arxiv.org/abs/2010.09497