1999
DOI: 10.1557/jmr.1999.0146
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Quantitative assessment of pores in oxidized carbon spheres using scanning tunneling microscopy

Abstract: Surface heterogeneity, particularly shape and size of pores on the surface of activated carbon spheres were studied by using scanning tunneling microscopy (STM) and field-emission type scanning electron microscopy (FE-SEM). Spheres were carbonized either in N 2 or CO 2 atmosphere and oxidized ones were used as samples. A new numerical method based on the determination of contour maps from STM images was proposed in order to determine the size distribution in micropores. These results were discussed with respec… Show more

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Cited by 42 publications
(16 citation statements)
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“…The type of spherical particle produced is dependent on the method of preparation, carbon source and the reaction conditions used [5][6][7][8][9][10][11][12]. These spherical materials have many potential applications, such as use as absorbents [14,15], as catalyst supports [16] or as anodes for use in lithium ion batteries [9,17].…”
Section: Introductionmentioning
confidence: 99%
“…The type of spherical particle produced is dependent on the method of preparation, carbon source and the reaction conditions used [5][6][7][8][9][10][11][12]. These spherical materials have many potential applications, such as use as absorbents [14,15], as catalyst supports [16] or as anodes for use in lithium ion batteries [9,17].…”
Section: Introductionmentioning
confidence: 99%
“…Indeed, one of the authors (M.I.) has reported that some porous carbons with high adsorption capacity for trihalomethanes (THMs) could be prepared by carbonizing phenol spheres under carbon dioxide atmosphere, followed by nitric acid oxidation, but those carbonized under nitrogen atmosphere did not show such performance [9][10][11][12][13][14]. In addition, Kim et al [15] have demonstrated that, after acid oxidation of the carbonized PF spheres, the microporosity decreased for the spheres heat-treated under CO 2 , whereas it increased for those under N 2 atmosphere, and hence both the adsorption capacity of the acid-oxidized PF spheres for halogenated methanes and the morphology of the spheres depend very much on the surface chemistry.…”
Section: Introductionmentioning
confidence: 99%
“…1(b). From the analysis using contour maps of these STM images, 8 however, all of them were ruled out from pores because of their shallow profile in height mode. Therefore, neither macropores nor mesopores were formed on the surface of GP30 spheres during carbonization.…”
Section: Resultsmentioning
confidence: 99%
“…3,5,6 With the same spheres, a new procedure for the analysis of shape and size distribution of pore entrance using STM was developed, and the effect of oxidation on pore structure was studied. 8 The effect of oxygen plasma treatment of these spheres on surface morphology was preliminarily studied under STM in relation to gas adsorption behavior. 9 By modification of the surface of the spheres, relatively high adsorption capacity was obtained for trihalomethanes dissolved in water.…”
Section: Introductionmentioning
confidence: 99%