Defocus image contrast in hexagonally-ordered mesoporous material
A transmission electron microscope was used to characterize a powder form of hexagonally-ordered mesoporous silica material. The structural symmetry built into this amorphous material allowed one to obtain three characteristic images, i.e. a hexagonal honey-comb structure and wide/narrow parallel li...
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| Veröffentlicht in: | Physical chemistry chemical physics : PCCP 2011-01, Vol.13 (3), p.1189-12 |
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| creator | Nakahara, S Tanner, D. A Hudson, S Magner, E Redington, W Hodnett, K |
| description | A transmission electron microscope was used to characterize a powder form of hexagonally-ordered mesoporous silica material. The structural symmetry built into this amorphous material allowed one to obtain three characteristic images,
i.e.
a hexagonal honey-comb structure and wide/narrow parallel lines. These images were found to originate primarily from phase contrast, which changed sensitively with defocusing. To further understand the contrast behaviour of these images, an analytical form of the defocus contrast theory was developed and applied to the simulation of the characteristic wide/narrow parallel line images. The simulation was found to be in good qualitative agreement with experiments, where changes in focus conditions and specimen thickness were predicted to alter the contrast in the resulting parallel-line type images.
BF TEM micrographs of mesoporous silica have been simulated using defocus contrast theory from first principles indicating the effect of beam and sample conditions on the observed pore structure. |
| doi_str_mv | 10.1039/c0cp01141j |
| format | Article |
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i.e.
a hexagonal honey-comb structure and wide/narrow parallel lines. These images were found to originate primarily from phase contrast, which changed sensitively with defocusing. To further understand the contrast behaviour of these images, an analytical form of the defocus contrast theory was developed and applied to the simulation of the characteristic wide/narrow parallel line images. The simulation was found to be in good qualitative agreement with experiments, where changes in focus conditions and specimen thickness were predicted to alter the contrast in the resulting parallel-line type images.
BF TEM micrographs of mesoporous silica have been simulated using defocus contrast theory from first principles indicating the effect of beam and sample conditions on the observed pore structure.</description><identifier>ISSN: 1463-9076</identifier><identifier>EISSN: 1463-9084</identifier><identifier>DOI: 10.1039/c0cp01141j</identifier><identifier>PMID: 21076765</identifier><language>eng</language><publisher>Cambridge: Royal Society of Chemistry</publisher><subject>Amorphous materials ; Chemistry ; Colloidal state and disperse state ; Exact sciences and technology ; General and physical chemistry ; Image contrast ; Mathematical analysis ; Phase contrast ; Physical chemistry ; Porous materials ; Simulation ; Symmetry</subject><ispartof>Physical chemistry chemical physics : PCCP, 2011-01, Vol.13 (3), p.1189-12</ispartof><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c391t-1d0548229a06bc02672c0d4674cd77b0ddfae492003a04587e88d0992ff534193</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=23829421$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/21076765$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Nakahara, S</creatorcontrib><creatorcontrib>Tanner, D. A</creatorcontrib><creatorcontrib>Hudson, S</creatorcontrib><creatorcontrib>Magner, E</creatorcontrib><creatorcontrib>Redington, W</creatorcontrib><creatorcontrib>Hodnett, K</creatorcontrib><title>Defocus image contrast in hexagonally-ordered mesoporous material</title><title>Physical chemistry chemical physics : PCCP</title><addtitle>Phys Chem Chem Phys</addtitle><description>A transmission electron microscope was used to characterize a powder form of hexagonally-ordered mesoporous silica material. The structural symmetry built into this amorphous material allowed one to obtain three characteristic images,
i.e.
a hexagonal honey-comb structure and wide/narrow parallel lines. These images were found to originate primarily from phase contrast, which changed sensitively with defocusing. To further understand the contrast behaviour of these images, an analytical form of the defocus contrast theory was developed and applied to the simulation of the characteristic wide/narrow parallel line images. The simulation was found to be in good qualitative agreement with experiments, where changes in focus conditions and specimen thickness were predicted to alter the contrast in the resulting parallel-line type images.
BF TEM micrographs of mesoporous silica have been simulated using defocus contrast theory from first principles indicating the effect of beam and sample conditions on the observed pore structure.</description><subject>Amorphous materials</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Image contrast</subject><subject>Mathematical analysis</subject><subject>Phase contrast</subject><subject>Physical chemistry</subject><subject>Porous materials</subject><subject>Simulation</subject><subject>Symmetry</subject><issn>1463-9076</issn><issn>1463-9084</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNqF0c9LwzAUB_AgitPpxbtSDyII1ZcfTZvjqL8Z6EHPJUvS2dE2NenA_fdmbm43PSUkn7z3-AahEwzXGKi4UaA6wJjh2Q46wIzTWEDGdjf7lA_QofczAMAJpvtoQHA4THlygEa3prRq7qOqkVMTKdv2Tvo-qtrow3zJqW1lXS9i67RxRkeN8bazzoYHjeyNq2R9hPZKWXtzvF6H6P3-7i1_jMcvD0_5aBwrKnAfYw0JywgREvhEAeEpUaAZT5nSaToBrUtpmCAAVAJLstRkmQYhSFkmlGFBh-hyVbdz9nNufF80lVemrmVrwjyF4DTjDCj-V2YEhzZc0CCvVlI5670zZdG5EIRbFBiKZbZFDvnrT7bPAZ-ty84njdEb-htmABdrIL2Sdelkqyq_dTQjgpHlfOcr57za3G4_seh0GczpX4Z-AzWblMw</recordid><startdate>20110121</startdate><enddate>20110121</enddate><creator>Nakahara, S</creator><creator>Tanner, D. A</creator><creator>Hudson, S</creator><creator>Magner, E</creator><creator>Redington, W</creator><creator>Hodnett, K</creator><general>Royal Society of Chemistry</general><scope>IQODW</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>20110121</creationdate><title>Defocus image contrast in hexagonally-ordered mesoporous material</title><author>Nakahara, S ; Tanner, D. A ; Hudson, S ; Magner, E ; Redington, W ; Hodnett, K</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c391t-1d0548229a06bc02672c0d4674cd77b0ddfae492003a04587e88d0992ff534193</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Amorphous materials</topic><topic>Chemistry</topic><topic>Colloidal state and disperse state</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Image contrast</topic><topic>Mathematical analysis</topic><topic>Phase contrast</topic><topic>Physical chemistry</topic><topic>Porous materials</topic><topic>Simulation</topic><topic>Symmetry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Nakahara, S</creatorcontrib><creatorcontrib>Tanner, D. A</creatorcontrib><creatorcontrib>Hudson, S</creatorcontrib><creatorcontrib>Magner, E</creatorcontrib><creatorcontrib>Redington, W</creatorcontrib><creatorcontrib>Hodnett, K</creatorcontrib><collection>Pascal-Francis</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physical chemistry chemical physics : PCCP</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Nakahara, S</au><au>Tanner, D. A</au><au>Hudson, S</au><au>Magner, E</au><au>Redington, W</au><au>Hodnett, K</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Defocus image contrast in hexagonally-ordered mesoporous material</atitle><jtitle>Physical chemistry chemical physics : PCCP</jtitle><addtitle>Phys Chem Chem Phys</addtitle><date>2011-01-21</date><risdate>2011</risdate><volume>13</volume><issue>3</issue><spage>1189</spage><epage>12</epage><pages>1189-12</pages><issn>1463-9076</issn><eissn>1463-9084</eissn><abstract>A transmission electron microscope was used to characterize a powder form of hexagonally-ordered mesoporous silica material. The structural symmetry built into this amorphous material allowed one to obtain three characteristic images,
i.e.
a hexagonal honey-comb structure and wide/narrow parallel lines. These images were found to originate primarily from phase contrast, which changed sensitively with defocusing. To further understand the contrast behaviour of these images, an analytical form of the defocus contrast theory was developed and applied to the simulation of the characteristic wide/narrow parallel line images. The simulation was found to be in good qualitative agreement with experiments, where changes in focus conditions and specimen thickness were predicted to alter the contrast in the resulting parallel-line type images.
BF TEM micrographs of mesoporous silica have been simulated using defocus contrast theory from first principles indicating the effect of beam and sample conditions on the observed pore structure.</abstract><cop>Cambridge</cop><pub>Royal Society of Chemistry</pub><pmid>21076765</pmid><doi>10.1039/c0cp01141j</doi><tpages>12</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Physical chemistry chemical physics : PCCP, 2011-01, Vol.13 (3), p.1189-12 |
| issn | 1463-9076 1463-9084 |
| language | eng |
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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Amorphous materials Chemistry Colloidal state and disperse state Exact sciences and technology General and physical chemistry Image contrast Mathematical analysis Phase contrast Physical chemistry Porous materials Simulation Symmetry |
| title | Defocus image contrast in hexagonally-ordered mesoporous material |
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