ºÝºÝߣshows by User: cristinachiutu / http://www.slideshare.net/images/logo.gif ºÝºÝߣshows by User: cristinachiutu / Mon, 08 Jun 2015 14:10:36 GMT ºÝºÝߣShare feed for ºÝºÝߣshows by User: cristinachiutu Poster presentation cristina chiutu bremen blsm 2015 /slideshow/poster-presentation-cristina-chiutu-bremen-blsm-2015/49124964 posterpresentationcristinachiutubremenblsm2015-150608141036-lva1-app6892
Characterizing the Interaction of Chromatographic Beads with Yeast by Force Spectroscopy and XDLVO]]>
Characterizing the Interaction of Chromatographic Beads with Yeast by Force Spectroscopy and XDLVO]]> Mon, 08 Jun 2015 14:10:36 GMT /slideshow/poster-presentation-cristina-chiutu-bremen-blsm-2015/49124964 cristinachiutu@slideshare.net(cristinachiutu) Poster presentation cristina chiutu bremen blsm 2015 cristinachiutu Characterizing the Interaction of Chromatographic Beads with Yeast by Force Spectroscopy and XDLVO <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/posterpresentationcristinachiutubremenblsm2015-150608141036-lva1-app6892-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Characterizing the Interaction of Chromatographic Beads with Yeast by Force Spectroscopy and XDLVO
Poster presentation cristina chiutu bremen blsm 2015 from Cristina Chiutu
]]> 457 1 https://cdn.slidesharecdn.com/ss_thumbnails/posterpresentationcristinachiutubremenblsm2015-150608141036-lva1-app6892-thumbnail.jpg?width=120&height=120&fit=bounds document 000000 http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Poster Presentation Cristina Chiutu Borstel 2015 /slideshow/poster-presentation-cristina-chiutu-borstel-2015/46214563 97cd88c6-290b-4332-8b4f-8febab1b571b-150324061959-conversion-gate01
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]]> Tue, 24 Mar 2015 06:19:59 GMT /slideshow/poster-presentation-cristina-chiutu-borstel-2015/46214563 cristinachiutu@slideshare.net(cristinachiutu) Poster Presentation Cristina Chiutu Borstel 2015 cristinachiutu <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/97cd88c6-290b-4332-8b4f-8febab1b571b-150324061959-conversion-gate01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br>
Poster Presentation Cristina Chiutu Borstel 2015 from Cristina Chiutu
]]> 501 3 https://cdn.slidesharecdn.com/ss_thumbnails/97cd88c6-290b-4332-8b4f-8febab1b571b-150324061959-conversion-gate01-thumbnail.jpg?width=120&height=120&fit=bounds document 000000 http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 Imaging, spectroscopy and manipulation of C60 molecule on semiconductor surfaces with UHV STM and AFM - Ph. D. results 2014 cristina chiutu /slideshow/ph-d-results-2014-cristina-chiutu/32881501 phdresults2014cristinachiutu-140329053653-phpapp01
Scanning probe microscopy techniques were employed to investigate C60 molecules adsorbed on Si(111)-(7x7) and Ag-Si(111)-(√3x√3)R30o using imaging, spectroscopy, and manipulation methods. First, dynamic scanning tunnelling microscopy revealed the lowest unoccupied molecular orbital features of C60 molecules adsorbed on Si(111)-(7x7) with extremely high resolution at 77 K. Experimental data were compared with Hückel molecular orbital theory simulations to determine the orientation of the molecules on these surfaces. Second, C60 molecules were imaged with a qPlus atomic force microscope, in the attractive force regime and appeared as bright spherical protrusions. The potential energy of interaction between the AFM tip and C60 molecules adsorbed on Si(111)-(7x7) was quantified by force spectroscopy. Furthermore, a C60 molecule was transferred to the scanning probe microscope tip and used as molecular probe to image the Si(111)-(7x7) surface and other C60 molecules. The on-tip C60 molecule was imaged with high precision. Hückel molecular orbital theory calculations accurately predicted the shape and characteristics of molecular orbitals observed with dynamic scanning tunnelling microscopy, which were strongly dependent on molecular symmetry, orientation, and adsorption angle. Using qPlus atomic force microscopy, chemical reactivity was probed close to or at the carbon atom positions in the C60 cage. Density functional theory simulations showed that an (iono)covalent bond formed between a carbon atom and the underlying Si adatom was responsible for contrast formation. The pair potential for two C60 molecules was also determined experimentally and found to be in very good agreement with the Girifalco potential (Girifalco, L.A., J. Phys. Chem., 1992. 96(2): p. 858). Using Hückel molecular orbital theory, the mutual orientation of a C60 molecule adsorbed on the STM/AFM tip and a C60 molecule adsorbed on the Si(111)-(7x7) surface was determined via comparison of simulated images to the experimental data. Individual C60 molecules were also manipulated with qPlus atomic force microscopy. Manipulation of single C60 molecules was performed on the Ag-Si(111)-(√3x√3)R30o surface using scanning tunnelling microscopy at room temperature and at 100 K. The interaction was predominantly attractive. Due to weak molecule-substrate interaction, a short-range chemical force between the C60 molecule and the tip was considered to be responsible for the manipulation process.]]>
Scanning probe microscopy techniques were employed to investigate C60 molecules adsorbed on Si(111)-(7x7) and Ag-Si(111)-(√3x√3)R30o using imaging, spectroscopy, and manipulation methods. First, dynamic scanning tunnelling microscopy revealed the lowest unoccupied molecular orbital features of C60 molecules adsorbed on Si(111)-(7x7) with extremely high resolution at 77 K. Experimental data were compared with Hückel molecular orbital theory simulations to determine the orientation of the molecules on these surfaces. Second, C60 molecules were imaged with a qPlus atomic force microscope, in the attractive force regime and appeared as bright spherical protrusions. The potential energy of interaction between the AFM tip and C60 molecules adsorbed on Si(111)-(7x7) was quantified by force spectroscopy. Furthermore, a C60 molecule was transferred to the scanning probe microscope tip and used as molecular probe to image the Si(111)-(7x7) surface and other C60 molecules. The on-tip C60 molecule was imaged with high precision. Hückel molecular orbital theory calculations accurately predicted the shape and characteristics of molecular orbitals observed with dynamic scanning tunnelling microscopy, which were strongly dependent on molecular symmetry, orientation, and adsorption angle. Using qPlus atomic force microscopy, chemical reactivity was probed close to or at the carbon atom positions in the C60 cage. Density functional theory simulations showed that an (iono)covalent bond formed between a carbon atom and the underlying Si adatom was responsible for contrast formation. The pair potential for two C60 molecules was also determined experimentally and found to be in very good agreement with the Girifalco potential (Girifalco, L.A., J. Phys. Chem., 1992. 96(2): p. 858). Using Hückel molecular orbital theory, the mutual orientation of a C60 molecule adsorbed on the STM/AFM tip and a C60 molecule adsorbed on the Si(111)-(7x7) surface was determined via comparison of simulated images to the experimental data. Individual C60 molecules were also manipulated with qPlus atomic force microscopy. Manipulation of single C60 molecules was performed on the Ag-Si(111)-(√3x√3)R30o surface using scanning tunnelling microscopy at room temperature and at 100 K. The interaction was predominantly attractive. Due to weak molecule-substrate interaction, a short-range chemical force between the C60 molecule and the tip was considered to be responsible for the manipulation process.]]> Sat, 29 Mar 2014 05:36:53 GMT /slideshow/ph-d-results-2014-cristina-chiutu/32881501 cristinachiutu@slideshare.net(cristinachiutu) Imaging, spectroscopy and manipulation of C60 molecule on semiconductor surfaces with UHV STM and AFM - Ph. D. results 2014 cristina chiutu cristinachiutu Scanning probe microscopy techniques were employed to investigate C60 molecules adsorbed on Si(111)-(7x7) and Ag-Si(111)-(√3x√3)R30o using imaging, spectroscopy, and manipulation methods. First, dynamic scanning tunnelling microscopy revealed the lowest unoccupied molecular orbital features of C60 molecules adsorbed on Si(111)-(7x7) with extremely high resolution at 77 K. Experimental data were compared with Hückel molecular orbital theory simulations to determine the orientation of the molecules on these surfaces. Second, C60 molecules were imaged with a qPlus atomic force microscope, in the attractive force regime and appeared as bright spherical protrusions. The potential energy of interaction between the AFM tip and C60 molecules adsorbed on Si(111)-(7x7) was quantified by force spectroscopy. Furthermore, a C60 molecule was transferred to the scanning probe microscope tip and used as molecular probe to image the Si(111)-(7x7) surface and other C60 molecules. The on-tip C60 molecule was imaged with high precision. Hückel molecular orbital theory calculations accurately predicted the shape and characteristics of molecular orbitals observed with dynamic scanning tunnelling microscopy, which were strongly dependent on molecular symmetry, orientation, and adsorption angle. Using qPlus atomic force microscopy, chemical reactivity was probed close to or at the carbon atom positions in the C60 cage. Density functional theory simulations showed that an (iono)covalent bond formed between a carbon atom and the underlying Si adatom was responsible for contrast formation. The pair potential for two C60 molecules was also determined experimentally and found to be in very good agreement with the Girifalco potential (Girifalco, L.A., J. Phys. Chem., 1992. 96(2): p. 858). Using Hückel molecular orbital theory, the mutual orientation of a C60 molecule adsorbed on the STM/AFM tip and a C60 molecule adsorbed on the Si(111)-(7x7) surface was determined via comparison of simulated images to the experimental data. Individual C60 molecules were also manipulated with qPlus atomic force microscopy. Manipulation of single C60 molecules was performed on the Ag-Si(111)-(√3x√3)R30o surface using scanning tunnelling microscopy at room temperature and at 100 K. The interaction was predominantly attractive. Due to weak molecule-substrate interaction, a short-range chemical force between the C60 molecule and the tip was considered to be responsible for the manipulation process. <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/phdresults2014cristinachiutu-140329053653-phpapp01-thumbnail.jpg?width=120&amp;height=120&amp;fit=bounds" /><br> Scanning probe microscopy techniques were employed to investigate C60 molecules adsorbed on Si(111)-(7x7) and Ag-Si(111)-(√3x√3)R30o using imaging, spectroscopy, and manipulation methods. First, dynamic scanning tunnelling microscopy revealed the lowest unoccupied molecular orbital features of C60 molecules adsorbed on Si(111)-(7x7) with extremely high resolution at 77 K. Experimental data were compared with Hückel molecular orbital theory simulations to determine the orientation of the molecules on these surfaces. Second, C60 molecules were imaged with a qPlus atomic force microscope, in the attractive force regime and appeared as bright spherical protrusions. The potential energy of interaction between the AFM tip and C60 molecules adsorbed on Si(111)-(7x7) was quantified by force spectroscopy. Furthermore, a C60 molecule was transferred to the scanning probe microscope tip and used as molecular probe to image the Si(111)-(7x7) surface and other C60 molecules. The on-tip C60 molecule was imaged with high precision. Hückel molecular orbital theory calculations accurately predicted the shape and characteristics of molecular orbitals observed with dynamic scanning tunnelling microscopy, which were strongly dependent on molecular symmetry, orientation, and adsorption angle. Using qPlus atomic force microscopy, chemical reactivity was probed close to or at the carbon atom positions in the C60 cage. Density functional theory simulations showed that an (iono)covalent bond formed between a carbon atom and the underlying Si adatom was responsible for contrast formation. The pair potential for two C60 molecules was also determined experimentally and found to be in very good agreement with the Girifalco potential (Girifalco, L.A., J. Phys. Chem., 1992. 96(2): p. 858). Using Hückel molecular orbital theory, the mutual orientation of a C60 molecule adsorbed on the STM/AFM tip and a C60 molecule adsorbed on the Si(111)-(7x7) surface was determined via comparison of simulated images to the experimental data. Individual C60 molecules were also manipulated with qPlus atomic force microscopy. Manipulation of single C60 molecules was performed on the Ag-Si(111)-(√3x√3)R30o surface using scanning tunnelling microscopy at room temperature and at 100 K. The interaction was predominantly attractive. Due to weak molecule-substrate interaction, a short-range chemical force between the C60 molecule and the tip was considered to be responsible for the manipulation process.
Imaging, spectroscopy and manipulation of C60 molecule on semiconductor surfaces with UHV STM and AFM - Ph. D. results 2014 cristina chiutu from Cristina Chiutu
]]> 2117 8 https://cdn.slidesharecdn.com/ss_thumbnails/phdresults2014cristinachiutu-140329053653-phpapp01-thumbnail.jpg?width=120&height=120&fit=bounds presentation White http://activitystrea.ms/schema/1.0/post http://activitystrea.ms/schema/1.0/posted 0 https://cdn.slidesharecdn.com/profile-photo-cristinachiutu-48x48.jpg?cb=1546470940 Interest positions: industrial researcher, scientist, engineer Interest fields: scanning probe microscopy, surface science, nanotechnology, biotechnology Lab Techniques and skills: UHV RT/VT/LT STM/dynamic STM/qPlus AFM (imaging,spectroscopy,manipulation) Air STM Air/liquid AFM (imaging,force spectroscopy,nanoindentation, also on biological samples: cells, ants) XPS, UPS, IPES, LEED (operation only) Spin-coating (deposition of organic molecules from solution) Vacuum thermal evaporation of metals UV-Ozone plasma cleaning Ar ion sputtering UHV thermal evaporation: Ag, C60, porphyrins, ionic liquid In-situ sample preparation: Au(111), Au(110), Si(111), Si(100) Culture of cancer and normal ... https://cdn.slidesharecdn.com/ss_thumbnails/posterpresentationcristinachiutubremenblsm2015-150608141036-lva1-app6892-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/poster-presentation-cristina-chiutu-bremen-blsm-2015/49124964 Poster presentation cr... https://cdn.slidesharecdn.com/ss_thumbnails/97cd88c6-290b-4332-8b4f-8febab1b571b-150324061959-conversion-gate01-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/poster-presentation-cristina-chiutu-borstel-2015/46214563 Poster Presentation Cr... https://cdn.slidesharecdn.com/ss_thumbnails/phdresults2014cristinachiutu-140329053653-phpapp01-thumbnail.jpg?width=320&height=320&fit=bounds slideshow/ph-d-results-2014-cristina-chiutu/32881501 Imaging, spectroscopy...