Characterization of highly hydrophobic coatings deposited onto pre-oxidized silicon from water dispersible organosilanes

Almanza-Workman, A. Marcia; Raghavan, Srini; Petrović, Slobodan; Gogoi, Bishnu P.; Deymier, Pierre A.; Monk, David J.; Roop, Ray

doi:10.1016/s0040-6090(02)00997-5

Cited by 35 publications

(27 citation statements)

References 39 publications

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“…Coatings deposited from silane dispersions containing small amounts of DTAB (below 0.01 M) appear to be thicker than a monolayer. Previous AFM studies [17] by the authors have shown that these coatings indeed contain particulates. As the surfactant concentration increased, the adsorption density decreased due to retarded condensation in solution that reduced the deposition of particulates on the substrate.…”

Section: Resultsmentioning

confidence: 83%

“…With water as the reaction solvent, monolayer coverage of the solid surface is not generally favored. Instead, formation of particulates onto the substrate can occur due to vertical polycondensation of hydrolyzed silanes (Scheme 1(b)) or due to the deposition of aggregates [14,15] formed in the aqueous phase (Scheme 1(c)) [16,17]. Increasing concerns regarding the use of organic solvents in work places and the generation of organic wastes have sparked interest in the feasibility of applying highly hydrophobic coatings from water-based chemistries.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing concerns regarding the use of organic solvents in work places and the generation of organic wastes have sparked interest in the feasibility of applying highly hydrophobic coatings from water-based chemistries. The authors of this paper have shown that aqueous dispersions of a commercially available water dispersible silane (Siliclad ® ) may be used to render pre-oxidized single crystal silicon [17] and polysilicon [18,19] highly hydrophobic. The value of advancing (θ adv ) and receding (θ rec ) contact angles for coatings prepared by an immersion technique in dispersions containing 3% or more reactive silane at pH of 4 were 90 and 60 • .…”

Section: Introductionmentioning

confidence: 99%

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Aqueous silane-surfactant co-dispersions for deposition of hydrophobic coatings onto pre-oxidized polysilicon

Almanza-Workman

Raghavan

Deymier

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The application of hydrophobic coatings onto pre-oxidized polysilicon substrates is an effective method to prevent or reduce "release" as well as "in-use" stiction in microelectromechanical systems (MEMS). A chemical system consisting of a commercially available water dispersible silane (Siliclad ® ) has previously been shown to be useful in rendering polysilicon surfaces hydrophobic. In this paper, the improvement of the stability of such a chemical system is described. The objectives of the work reported in this paper are: (1) to characterize the stability of the organosilane in aqueous solutions under conditions suitable for the formation of hydrophobic coatings and (2) to investigate the influence of cationic surfactants on gelation rate of silane dispersions, on the adsorption of organosilane molecules onto pre-oxidized polysilicon and on the hydrophobic character of the coatings. Additionally, the effect of chain length and concentration for a series of alkyltrimethylammonium (C 12 ,C 14 ,C 16 ) bromide surfactants on dispersion stability has been investigated.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aqueous silane-surfactant co-dispersions for deposition of hydrophobic coatings onto pre-oxidized polysilicon

Almanza-Workman

Raghavan

Deymier

et al. 2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The glass slides were then placed in a DCDMS solution for 15 minutes and thereafter flushed with chloroform to wash off the unreacted silanol groups from the surface, followed by another 45-minute treatment in DCDMS. 37,38 The modified films were dried using nitrogen gas.…”

Section: Surface Modificationmentioning

confidence: 99%

Antimicrobial performance of mesoporous titania thin films: role of pore size, hydrophobicity, and antibiotic release

Atefyekta¹,

Ercan²,

Karlsson³

et al. 2016

IJN

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Implant-associated infections are undesirable complications that might arise after implant surgery. If the infection is not prevented, it can lead to tremendous cost, trauma, and even life threatening conditions for the patient. Development of an implant coating loaded with antimicrobial substances would be an effective way to improve the success rate of implants. In this study, the in vitro efficacy of mesoporous titania thin films used as a novel antimicrobial release coating was evaluated. Mesoporous titania thin films with pore diameters of 4, 6, and 7 nm were synthesized using the evaporation-induced self-assembly method. The films were characterized and loaded with antimicrobial agents, including vancomycin, gentamicin, and daptomycin. Staphylococcus aureus and Pseudomonas aeruginosa were used to evaluate their effectiveness toward inhibiting bacterial colonization. Drug loading and delivery were studied using a quartz crystal microbalance with dissipation monitoring, which showed successful loading and release of the antibiotics from the surfaces. Results from counting bacterial colony-forming units showed reduced bacterial adhesion on the drug-loaded films. Interestingly, the presence of the pores alone had a desired effect on bacterial colonization, which can be attributed to the documented nanotopographical effect. In summary, this study provides significant promise for the use of mesoporous titania thin films for reducing implant infections.

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“…The samples to be surfacemodified were first pretreated in a water (deionized) bath for 45 minutes at 25°C to increase the amount of hydroxyl groups on the surface. 38,39 The samples were then immersed in the DCDMS solution for 15 minutes. After that, they were rinsed with chloroform, followed by again being immersed into the DCDMS solution for 45 minutes.…”

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confidence: 99%

Controlling drug delivery kinetics from mesoporous titania thin films by pore size and surface energy

Karlsson¹,

Atefyekta²,

Andersson³

2015

IJN

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The osseointegration capacity of bone-anchoring implants can be improved by the use of drugs that are administrated by an inbuilt drug delivery system. However, to attain superior control of drug delivery and to have the ability to administer drugs of varying size, including proteins, further material development of drug carriers is needed. Mesoporous materials have shown great potential in drug delivery applications to provide and maintain a drug concentration within the therapeutic window for the desired period of time. Moreover, drug delivery from coatings consisting of mesoporous titania has shown to be promising to improve healing of bone-anchoring implants. Here we report on how the delivery of an osteoporosis drug, alendronate, can be controlled by altering pore size and surface energy of mesoporous titania thin films. The pore size was varied from 3.4 nm to 7.2 nm by the use of different structure-directing templates and addition of a swelling agent. The surface energy was also altered by grafting dimethylsilane to the pore walls. The drug uptake and release profiles were monitored in situ using quartz crystal microbalance with dissipation (QCM-D) and it was shown that both pore size and surface energy had a profound effect on both the adsorption and release kinetics of alendronate. The QCM-D data provided evidence that the drug delivery from mesoporous titania films is controlled by a binding–diffusion mechanism. The yielded knowledge of release kinetics is crucial in order to improve the in vivo tissue response associated to therapeutic treatments.

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Characterization of highly hydrophobic coatings deposited onto pre-oxidized silicon from water dispersible organosilanes

Cited by 35 publications

References 39 publications

Aqueous silane-surfactant co-dispersions for deposition of hydrophobic coatings onto pre-oxidized polysilicon

Aqueous silane-surfactant co-dispersions for deposition of hydrophobic coatings onto pre-oxidized polysilicon

Antimicrobial performance of mesoporous titania thin films: role of pore size, hydrophobicity, and antibiotic release

Controlling drug delivery kinetics from mesoporous titania thin films by pore size and surface energy

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Characterization of highly hydrophobic coatings deposited onto pre-oxidized silicon from water dispersible organosilanes

Cited by 35 publications

References 39 publications

Aqueous silane-surfactant co-dispersions for deposition of hydrophobic coatings onto pre-oxidized polysilicon

Aqueous silane-surfactant co-dispersions for deposition of hydrophobic coatings onto pre-oxidized polysilicon

Antimicrobial performance of mesoporous titania thin films: role of pore size, hydrophobicity, and antibiotic release

Controlling drug delivery kinetics from mesoporous titania thin films by pore size and&nbsp;surface energy

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Controlling drug delivery kinetics from mesoporous titania thin films by pore size and surface energy