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Atomic force and scanning tunneling microscopy analysis of palladium and silver nanophase materials (1994)

Sattler, K. ; Raina, G. ; Ge, M. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 76 (1994), S. 546-551

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Atomic force and scanning tunneling microscopy images of nanophase palladium and silver materials taken on various length scales are presented. The samples show a conformational packing of individual nanometer-sized clusters. In the case of silver, islands of clusters are observed on micrometer length scales. The islands are very flat and separated by deep crevices. The grains (clusters) within the islands are closely packed with shapes adjusting to the neighboring grains. The islands are compact, either equiaxed or oblong in shape. Average island diameters of 200–300 nm and average grain sizes of 20–50 nm were measured. The height variations on the islands are between 5 and 15 nm. The crevices are between 200 and 400 nm deep. In the case of palladium, the clusters are more uniformly packed and do not appear to be agglomerated in islands. Palladium grain sizes typically of 15 nm were measured along with corrugations of 10 nm in the closely packed areas.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.357109

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Polymer encapsulated packing material for reversed phase liquid chromatography (1994)

Zuo, Y. M. ; Zhu, B. R. ; Liao, Y. ; [et al.]

Springer

Chromatographia 38 (1994), S. 756-760

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ISSN: 1612-1112

Keywords: Column liquid chromatography ; Polymer encapsulated packings ; Poly(ethylstyrene-divinylbenzene) ; Preparation and evaluation

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Summary A series of polymer-encapsulated packing materials for reversed phase high-performance liquid chromatography was prepared by radical polymerization of ethylstyrene and divinylbenzene with vinyl-modified silica in solution. Some characteristics such as polymer structure, swelling propensity, residual silanols, column efficiency and retention properties were evaluated. Such material is easy to pack and yields high column efficiencies. Its superior performance for the separation of mixtures of aromatic hydrocarbons, amino- and hydroxyl group containing compounds are demonstrated by several examples.