Modification of surface properties of alumina by plasma treatment

Pereira, Gilberto José; Silva, Maria Lucia P. da; Tan, Ing Hwie; Gouvêa, Douglas

doi:10.1039/a909049e

Cited by 15 publications

(13 citation statements)

References 7 publications

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“…These results are comparable to reported values of 94-110° for other self-assembly conditions [29]. We also measured an average root-mean-square roughness of 2.5 nm after treatment using atomic force microscopy (AlphaSNOM300a WiTec, Ulm, Germany), which differed from the untreated roughness of 0.8 nm.…”

Section: Device Characterizationsupporting

confidence: 89%

MEMS-based shear characterization of soft hydrated samples

Higgs

Simmons

Gao

et al. 2013

J. Micromech. Microeng.

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We have designed, fabricated, calibrated and tested actuators for shear characterization to assess microscale shear properties of soft substrates. Here we demonstrate characterization of dry silicone and hydrated polyethelyne glycol. Microscale tools, including atomic force microscopes and nanoindenters, often have limited functionality in hydrated environments. While electrostatic comb-drive actuators are particularly susceptible to moisture damage, through chemical vapor deposition of hexamethyldisiloxane, we increase the hydrophobicity of our electrostatic devices to a water contact angle 90 ± 3°. With this technique we determine the effective shear stiffness of both dry and hydrated samples for a range of soft substrates. Using computational and analytical models, we compare our empirically determined effective shear stiffness with existing characterization methods, rheology and nanoindentation, for samples with shear moduli ranging from 5-320 kPa. This work introduces a new approach for microscale assessment of synthetic materials that can be used on biological materials for basic and applied biomaterials research.

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Section: Device Characterizationsupporting

confidence: 89%

MEMS-based shear characterization of soft hydrated samples

Higgs

Simmons

Gao

et al. 2013

J. Micromech. Microeng.

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“…Films were produced using a homemade capacitive plasma reactor, with a 40 KHz power supply. 31 The deposition time was always 5 min and the reactant flow roughly 1 g/min. Two deposition modes was used, the so-called open and closed chamber.…”

Section: Methodsmentioning

confidence: 99%

Plasma polymerized acetaldehyde thin films for retention of volatile organic compounds

Hernandez¹,

Lima²,

Carvalho³

et al. 2008

Quím. Nova

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Recebido em 10/8/07; aceito em 31/1/08; publicado na web em 20/8/08PLASMA POLYMERIZED ACETALDEHYDE THIN FILMS FOR RETENTION OF VOLATILE ORGANIC COMPOUNDS. The aim of this work is the production and characterization of plasma polymerized acetaldehyde thin films. These films show highly polar species, are hydrophilic, organophilic and easily adsorb organic reactants with CO radicals but only allow permeation of reactants with OH radicals. The good step coverage of films deposited on aluminum trenches is useful for sensor development. Films deposited on hydrophobic substrates may result in a discontinued layer, which allows the use of preconcentration in sample pretreatment. Deposition on microchannels showed the possibility of chromatographic columns and/or retention system production to selectively detect or remove organic compounds from gas flows.

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“…Plasma deposited thin films have been used on many applications, such as surface protection and/or modification [16][17][18] and recently organic thin films were tested for adsorption of volatile organic 0925 compounds (VOCs). These films were obtained using monomers in a large range of polarity: ethyl ether, ethyl or methyl acetate, acetone, acetaldehyde and 2-propanol [19][20][21][22][23] and using 40 kHz power supply.…”

Section: Introductionmentioning

confidence: 99%