Surface characterization of a National Bureau of Standards glass reference material by californium-252 particle desorption mass spectrometry

Summers, W. R.; Beug-Deeb, M. U. D.; Schweikert, E. A.

doi:10.1021/ac00169a021

Cited by 3 publications

(1 citation statement)

References 13 publications

(8 reference statements)

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“…Time-of-flight secondary ion mass spectroscopy (TOF SIMS) was achieved by bombarding silicon wafers with 252 Cf fission fragments. The mass spectrometer used in these experiments is discussed in detail elsewhere. , Both negative and positive secondary ion (SI) species were analyzed under the same experimental conditions. The bias voltage for the SI species was ±4 kV.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of Poly(ethylene glycol) Hydrogel Microstructures Using Photolithography

et al. 2001

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The fabrication of hydrogel microstructures based upon poly(ethylene glycol) diacrylates, dimethacrylates, and tetraacrylates patterned photolithographically on silicon or glass substrates is described. A silicon/silicon dioxide surface was treated with 3-(trichlorosilyl)propyl methacrylate to form a self-assembled monolayer (SAM) with pendant acrylate groups. The SAM presence on the surface was verified using ellipsometry and time-of-flight secondary ion mass spectrometry. A solution containing an acrylated or methacrylated poly(ethylene glycol) derivative and a photoinitiator (2,2-dimethoxy-2-phenylacetophenone) was spin-coated onto the treated substrate, exposed to 365 nm ultraviolet light through a photomask, and developed with either toluene, water, or supercritical CO2. As a result of this process, three-dimensional, cross-linked PEG hydrogel microstructures were immobilized on the surface. Diameters of cylindrical array members were varied from 600 to 7 micrometers by the use of different photomasks, while height varied from 3 to 12 micrometers, depending on the molecular weight of the PEG macromer. In the case of 7 micrometers diameter elements, as many as 400 elements were reproducibly generated in a 1 mm2 square pattern. The resultant hydrogel patterns were hydrated for as long as 3 weeks without delamination from the substrate. In addition, micropatterning of different molecular weights of PEG was demonstrated. Arrays of hydrogel disks containing an immobilized protein conjugated to a pH sensitive fluorophore were also prepared. The pH sensitivity of the gel-immobilized dye was similar to that in an aqueous buffer, and no leaching of the dye-labeled protein from the hydrogel microstructure was observed over a 1 week period. Changes in fluorescence were also observed for immobilized fluorophore labeled acetylcholine esterase upon the addition of acetyl acholine.

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Section: Methodsmentioning

confidence: 99%

Fabrication of Poly(ethylene glycol) Hydrogel Microstructures Using Photolithography

et al. 2001

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Surface characterization of chemically modified chrysotile asbestos by particle‐induced desorption mass spectrometry

Bennett

Schweikert

Poisson

et al. 1990

Surface & Interface Analysis

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252Cf particle-induced desorptioa mass spectrometry (PDMS) bas been used to follow the modification of cbrytile asbestos fiber with organosilane compounds Monitoring changes in the peak area ratios of Si', Mg+ and SiOH* ions in PDM!3 and atomic ratios from XPS, tbe formation of organosiloxaw polymers vertical to tbe surface is suggested. Changes in the ratios also indicate f i r i n g coverages of the modifiers, owing in part to steric effects associated witb the differeat organic substituents Tbe fibrom, aon-conductive nature of tbe sample did not impair tbe analysis witb 252-Cf PDMS. This application lends furtber support to the belief that PDMS is a surface-sensitive tecbniqw.

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Multicomponent dye detection with californium-252 particle-desorption mass spectrometry

Beug-Deeb

Bennett

Inman

et al. 1989

Analytica Chimica Acta

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Surface characterization of a National Bureau of Standards glass reference material by californium-252 particle desorption mass spectrometry

Cited by 3 publications

References 13 publications

Fabrication of Poly(ethylene glycol) Hydrogel Microstructures Using Photolithography

Fabrication of Poly(ethylene glycol) Hydrogel Microstructures Using Photolithography

Surface characterization of chemically modified chrysotile asbestos by particle‐induced desorption mass spectrometry

Multicomponent dye detection with californium-252 particle-desorption mass spectrometry

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