The surface analysis of a plasma modified contact lens surface by SSIMS

Fakes, D; Davies, Martyn C.; Brown, Alan B.; Newton, JM

doi:10.1002/sia.740130411

Cited by 65 publications

(31 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Scheme 1 illustrates that under roomtemperature conditions, CO 2 and CO desorb from the film and reveal underlying hydrocarbon layers, thereby sustaining the etch process. It should be noted that the observation of zeroth-order kinetics in the present investigation is in contrast to the pseudo first-order kinetics reported for the loss of methyl (CH 3 ) and methylene (CH 2 ) groups during the reaction between O( 3 P) and a LB film of cadmium arachidate (CH 3 (CH 2 ) 18 COO -) 2 Cd 2+ on silicon, measured by FTIR. 19 Efficiency of O Atom Etching.…”

Section: Scheme 1: Schematic Of the Interaction Of O/o 2 With A C 16 contrasting

confidence: 99%

“…In biomedical technology, Menicon, a commercially available material used in contact lenses, is treated with O 2 plasmas to increase hydrophilicity. 2 Oxygen plasmas have also been employed in the synthesis of diamond and diamond-like films. 3 During plasma processing, the sample is exposed to a complex reactive medium containing energetic species including ions, electrons, radicals, and UV/VUV radiation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Radical Reactions with Organic Thin Films: Chemical Interaction of Atomic Oxygen with an X-ray Modified Self-Assembled Monolayer

et al. 2002

View full text Add to dashboard Cite

The interaction of an X-ray-modified self-assembled monolayer with a mixture of atomic and molecular oxygen (O/O 2 ) has been studied using in situ X-ray photoelectron spectroscopy. Initially the reaction dynamics are dominated by the incorporation of new oxygen containing functionality at the vacuum/film interface. At intermediate O/O 2 exposures, when a steady-state concentration of C-O, CdO, and O-CdO groups has been established, the production of volatile carbon-containing species, including CO 2 , is responsible for etching the hydrocarbon film. Upon prolonged O/O 2 exposures, O atoms penetrate to the film/substrate interface, producing Au 2 O 3 and sulfonate (RSO 3 ) species. Under steady-state conditions, the thickness of the hydrocarbon film was reduced with an efficiency of ≈7.4 × 10 -4 Å/impingent O atom while the average penetration depth of O atoms within the hydrocarbon film was determined to be ≈5.5 Å.

show abstract

Section: Scheme 1: Schematic Of the Interaction Of O/o 2 With A C 16 contrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radical Reactions with Organic Thin Films: Chemical Interaction of Atomic Oxygen with an X-ray Modified Self-Assembled Monolayer

et al. 2002

View full text Add to dashboard Cite

show abstract

“…The oxidation of the organic residues of polysiloxanes leads to a silica-like surface containing hydroxyl groups [79]. Therefore, the oxidised surfaces become superhydrophilic, and contact angles with water range close to 0°.…”

Section: Oxidationmentioning

confidence: 99%

One-dimensional silicone nanofilaments

Artus

Seeger

2014

Advances in Colloid and Interface Science

View full text Add to dashboard Cite

A decade ago one-dimensional silicone nanofilaments (1D-SNF) such as fibres and wires were described for the first time. Since then, the exploration of 1D-SNF has led to remarkable advancements with respect to material science and surface science: one-, two-and three-dimensional nanostructures of silicone were unknown before. The discovery of silicone nanostructures marks a turning point in the research on the silicone material at the nanoscale. Coatings made of 1D-SNF are among the most superhydrophobic surfaces known today. They are free of fluorine, can be applied to a large range of technologically important materials and their properties can be modified chemically. This opens the way to many interesting applications such as water harvesting, superoleophobicity, separation of oil and water, patterned wettability and storage and manipulation of data on a surface. Because of their high surface area, coatings consisting of 1D-SNF are used for protein adsorption experiments and as carrier systems for catalytically active nanopartides. This paper reviews the current knowledge relating to the broad development of 1D-SNF technologies. Common preparation and coating techniques are presented along with a comparison and discussion of the published coating parameters to provide an insight on how these affect the topography of the 1D-SNF or coating. The proposed mechanisms of growth are presented, and their potentials and shortcomings are discussed. We introduce all explored applications and finally identify future prospects and potentials of 1D-SNF with respect to applications in material science and surface science.

show abstract

“…The FTIR spectra of the untreated and argonplasma-treated polycarbonate are presented in Figure 3. The values of the relative absorbance [i.e., the ratio of the absorbance of the plasma-treated polycarbonate (A) to the absorbance of the untreated polycarbonate (A 0 )] of various bands of polycarbonate are presented in Table III 3 ) showed a reduction in the absorbance after argon plasma treatment due to hydrogen abstraction. This led to the formation of free radicals, which , which corresponded to aromatic in-plane CAC stretching vibration.…”

Section: Surface Chemistry Of the Polycarbonatementioning

confidence: 98%

Surface modification of polycarbonate by radio‐frequency plasma and optimization of the process variables with response surface methodology

Nageswaran

Eswaraiah

Neogi

2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

This study deals with the radio-frequency plasma treatment of polycarbonate surfaces with argon. The wettability of polycarbonate was examined by static contact angle measurements with polar solvents (deionized water and formamide) and a nonpolar solvent (diiodomethane). The surface free energy of the polycarbonate obtained from the measured contact angle demonstrated that exposure to argon plasma resulted in an increased surface energy and polarity compared to the untreated polycarbonate. Attenuated total reflection/Fourier transform infrared spectroscopy indicated that argon plasma treatment resulted in surface chemistry changes by hydrogen abstraction from the phenyl ring and methyl group and chain scission at the ether and carbonyl sites. These led to the formation of hydroxyl groups and double bonds. With scanning electron microscopy and atomic force microscopy analysis, changes in the surface morphology and roughness before and after plasma treatment were observed. We followed an experimental matrix with the identified process variables affecting the wettability of the polymer, and optimized the experiments with the response surface methodology of a central composite design. A quadratic model was developed to represent the surface energy in terms of process variables. Optimized process conditions were derived from the predicted model and were confirmed by the experimental data at the predicted optimum conditions. The prediction accuracy of the model was found to be very high.

show abstract

The surface analysis of a plasma modified contact lens surface by SSIMS

Cited by 65 publications

References 11 publications

Radical Reactions with Organic Thin Films: Chemical Interaction of Atomic Oxygen with an X-ray Modified Self-Assembled Monolayer

Radical Reactions with Organic Thin Films: Chemical Interaction of Atomic Oxygen with an X-ray Modified Self-Assembled Monolayer

One-dimensional silicone nanofilaments

Surface modification of polycarbonate by radio‐frequency plasma and optimization of the process variables with response surface methodology

Contact Info

Product

Resources

About