Self-assembly of octadecyltrichlorosilane: Surface structures formed using different protocols of particle lithography

Saner, ChaMarra K.; Lusker, Kathie L.; LeJeune, Zorabel M.; Serem, Wilson K.; Garno, Jayne C.

doi:10.3762/bjnano.3.12

Cited by 41 publications

(57 citation statements)

References 54 publications

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“…The OTS coating was achieved either via a vapor deposition 35 or a solution immersion method. 36 For vapor deposition, silicon wafers were placed over a glass petri dish containing 300 mL OTS.…”

Section: Substrates For Fiber Collectionmentioning

confidence: 99%

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

2015

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We demonstrate that coaxial electrospinning with more than one core channel, each containing a different type of liquid crystal, can be used to produce multifunctional fibers in a one-step process. They respond to more than one stimulus or with multiple threshold values, and the individual cores may feature different physical properties such as iridescent reflection in one core and birefringence in another. In order to ensure good fiber morphology and intact, unmixed and well separated cores, two important precautions must be taken. First, the fibers should not be collected on a hydrophilic substrate, as this will lead to severe fiber deformation and core mixing after collection, as a result of capillary forces from the water that condenses on the fiber during spinning. Second, the addition of surfactants to the polymer solution should be avoided, although it may appear beneficial for the spinning process as it reduces surface tension and increases conductivity. This is because the surfactant enters the liquid crystal core, possibly together with water in the form of inverse micelles, seriously degrading the performance of the liquid crystal.

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Section: Substrates For Fiber Collectionmentioning

confidence: 99%

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

2015

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“…Further, changes in periodicity, density, and feature size can be modulated by changes in the diameter of the mesospheres used for both solution-and vapor-phase deposition of organosilane nanopatterns. 31,32,51,52 In this report, we investigate the influence of anhydrous toluene and bicyclohexyl on the solution-phase formation of nanopores …”

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confidence: 99%

Influence of Solvent on Octadecyltrichlorosilane Nanostructures Fabricated Using Particle Lithography

2015

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Numerous strategies have been devised to register organosilane monolayers for applications ranging from lubricants to semiconductor surface resists. Of these patterning techniques, particle lithography offers a straightforward and high-throughput method to create periodic arrays of organosilane nanopatterns. Herein, we describe the influence of solvent on the solutionphase formation of periodic arrays of nanopores within octadecyltrichlorosilane (OTS) monolayers using particle lithography. Our systematic study of various compositions of two miscible solvents, anhydrous toluene and bicyclohexyl, demonstrates control over nanopore size and OTS surface coverage. Smaller nanopores are generated from solutions with higher anhydrous toluene composition, and larger nanopores are generated from solutions with higher bicyclohexyl composition. A study of the effect of deposition time on nanopore formation found that at shorter deposition times (<5 min), the nanopore size is limited by diffusion into the water meniscus around the base of the nanoparticle, and at longer deposition times (>15 min), the size of the nanopore is limited by the mesosphere-substrate contact geometry as seen with anhydrous toluene solutions. This ability to regulate nanopore size and surface coverage, while preserving the interpattern periodicity, demonstrates an additional level of hierarchical control over organosilane nanostructure formation and enables a broader range of nanostructures that can be fabricated. ■ INTRODUCTIONThe study of organosilane self-assembled monolayers (SAMs) has garnered tremendous interest since they were first reported by Sagiv in 1980. 1−4 These systems, which are chemically and thermally robust due to covalent bonds formed with the underlying substrate, can also be tailored by varying their terminal functional groups. 5 Adding to their utility, densely packed organosilane SAMs can be prepared on a broad range of substrates, including semiconductor oxides, metal oxides, glass, mica, and quartz. 6−15 To date, numerous strategies have been devised to form and to register organosilane SAMs for applications ranging from lubricants to semiconductor surface resists. 16−28 Particle lithography is one such strategy that offers a straightforward and high-throughput method to fabricate periodic nanopatterns of organosilane SAMs. 10,29−32 In particle lithography, monodispersions of silica (or latex) spheres in water are deposited onto flat surfaces, and close-packed structures with regular interpattern geometries spontaneously assemble as the water evaporates. The resulting two-dimensional arrays serve as templates that guide the formation of organosilane SAMs into ordered nanopatterns. This patterning strategy has been employed to create nanostructures that (i) direct the synthesis of metals, rare earth oxide nanocrystals, and polymer brushes, (ii) capture metal nanoparticles and semiconductor quantum dots, and (iii) respond to changes in the chemical environment. 20,33−42 Given the potential applications, much work has been d...

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“…However, silanization rarely, if ever, provides complete surface coverage. 63 Furthermore, the sites of imperfect coverage on the PDMS surface act as nucleation sites to accelerate the decay of the silane monolayer. This can be modelled using simple mass action kinetics and we used this to modify the model developed above.…”

Section: E Amelioration Of Droplet Failure Modesmentioning

confidence: 99%

Droplet confinement and leakage: Causes, underlying effects, and amelioration strategies

2015

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The applicability of droplet-based microfluidic systems to many research fields stems from the fact that droplets are generally considered individual and selfcontained reaction vessels. This study demonstrates that, more often than not, the integrity of droplets is not complete, and depends on a range of factors including surfactant type and concentration, the micro-channel surface, droplet storage conditions, and the flow rates used to form and process droplets. Herein, a model microfluidic device is used for droplet generation and storage to allow the comparative study of forty-four different oil/surfactant conditions. Assessment of droplet stability under these conditions suggests a diversity of different droplet failure modes. These failure modes have been classified into families depending on the underlying effect, with both numerical and qualitative models being used to describe the causative effect and to provide practical solutions for droplet failure amelioration in microfluidic systems. V C 2015 AIP Publishing LLC.

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Self-assembly of octadecyltrichlorosilane: Surface structures formed using different protocols of particle lithography

Cited by 41 publications

References 54 publications

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

Multifunctional responsive fibers produced by dual liquid crystal core electrospinning

Influence of Solvent on Octadecyltrichlorosilane Nanostructures Fabricated Using Particle Lithography

Droplet confinement and leakage: Causes, underlying effects, and amelioration strategies

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