Mechanism of Surfactant Removal from Ordered Nanocomposite Silica Thin Films by Deep-UV Light Exposure

Dattelbaum, Andrew M.; Amweg, Meri L.; Ruiz, Julia D.; Ecke, Laurel E.; Shreve, Andrew P.; Parikh, Atul N.

doi:10.1557/proc-788-l7.11

Cited by 5 publications

(7 citation statements)

References 14 publications

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“…The surfactant templates were removed by a photocalcination procedure. 35,36 In this process films were exposed to 185-254 nm UV light for about 90 min to ensure complete surfactant removal. 36 Membrane Preparation.…”

Section: Experimental Methodsmentioning

confidence: 99%

Neutron Reflectivity Study of Lipid Membranes Assembled on Ordered Nanocomposite and Nanoporous Silica Thin Films

et al. 2005

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Single bilayer membranes of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) were formed on ordered nanocomposite and nanoporous silica thin films by fusion of small unilamellar vesicles. The structure of these membranes was investigated using neutron reflectivity. The underlying thin films were formed by evaporation induced self-assembly to obtain periodic arrangements of silica and surfactant molecules in the nanocomposite thin films, followed by photocalcination to oxidatively remove the organics and render the films nanoporous. We show that this platform affords homogeneous and continuous bilayer membranes that have promising applications as model membranes and sensors.

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Section: Experimental Methodsmentioning

confidence: 99%

Neutron Reflectivity Study of Lipid Membranes Assembled on Ordered Nanocomposite and Nanoporous Silica Thin Films

et al. 2005

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“…UV/ozone treatment was performed to photocalcine the organic ligands. 50,51 The time of exposure controlled the surface occupancy of the CH3 and CF3 groups, thereby adjusting the apparent contact angle, θ R , while maintaining constant porosity, Φs, and roughness AFM/SEM/TEM. Various microscopies were used to investigate the surface and bulk structure of the SH films.…”

Section: Experimental Methodsmentioning

confidence: 99%

Investigating the Interface of Superhydrophobic Surfaces in Contact with Water

et al. 2005

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Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and Investigating the interface of superhydrophobic surfaces in contact with water.. FUNDING NUMBERS DAAD1903102276. AUTHOR (S) Doshi, DA; Shah, PB; Singh, S; Branson, ED; Malanoski, AP; Watkins, EB; Majewski, J; van Swol, F; Brinker, CJ. Neutron reflectivity (NR) is used to probe the solid, liquid, vapor interface of a porous superhydrophobic (SH) surface submerged in water.Alow-temperature, low-pressure technique was used to prepare a rough, highly porous organosilica aerogel-like film. UV/ozone treatments were used to control the surface coverage of hydrophobic organic ligands on the silica framework, allowing the contact angle with water to be continuously varied over the range of 160° (superhydrophobic) to <10° (hydrophilic). NR shows that the superhydrophobic nature of the surface prevents infiltration of water into the porous film. Atomic force microscopy and density functional theory simulations are used in combination to interpret the NR results and help establish the location, width, and nature of the SH film-water interface. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)University14. SUBJECT Neutron reflectivity (NR) is used to probe the solid, liquid, vapor interface of a porous superhydrophobic (SH) surface submerged in water. A low-temperature, low-pressure technique was used to prepare a rough, highly porous organosilica aerogel-like film. UV/ozone treatments were used to control the surface coverage of hydrophobic organic ligands on the silica framework, allowing the contact angle with water to be continuously varied over the range of 160°(superhydrophobic) to <10°(hydrophilic). NR shows that the superhydrophobic nature of the surface prevents infiltration of water into the porous film. Atomic force microscopy and density functional theory simulations are used in combination to interpret the NR results and help establish the location, width, and nature of the SH film-water interface. IntroductionWe all can recall seeing water droplets "bead up" on the leaves of plants. Most famous is the Lotus leaf, called the "symbol of purity" because of its self-cleaning properties. At very shallow angles of inclination or with the slightest wind, water droplets roll rather than flow. 1,2 The rolling droplets entrain particle contaminants and parasites, thereby cleaning them from the Lotus leaf surface. It is now recognized that the fascinating fluid behaviors observed for the Lotus plant, like the rolling and bouncing o...

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“…Indeed the surfactant is the key component which dictates after removal the porosity and the structure of the silica backbone. , If in the early stages, powdered samples were the sole materials that were synthesized, very rapidly many researchers tried to design such materials in thin films. − Pioneered by J. Brinker the most common technique to make highly organized thin films is the EISA (evaporation induced self assembly) process, which consists of fostering the self-assembly of the surfactant during the fast evaporation of a volatile solvent such as ethanol together with the concomitant condensation of the silica network in acidic condition under controlled relative humidity. Highly ordered crystalline thin films have thus be synthesized with the ultimate goal to produce mesoporous materials by removing the surfactant either by calcination, solvent extraction or UV-light exposure. − Accessing the porosity is indeed of paramount importance in many applications such as dye sensitive solar cells (low-k) dielectric materials, for functionalizing the pore surface or to address the condensation of fluids inside the pores . So far hydrocarbon surfactants (cationic, nonionic, and anionic) were mostly used as templates because they are the most common ones available on the market at a cheap price.…”

Section: Introductionmentioning

confidence: 99%

Nonionic Fluorinated Surfactant Removal from Mesoporous Film Using sc-CO₂

Panduro

Assaker

Beuvier

et al. 2017

ACS Appl. Mater. Interfaces

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Surfactant templated silica thin films were self-assembled on solid substrates by dip-coating using a partially fluorinated surfactant R(EO) as the liquid crystal template. The aim was 2-fold: first we checked which composition in the phase diagram was corresponding to a 2D rectangular highly ordered crystalline phase and second we exposed the films to sc-CO to foster the removal of the surfactant. The films were characterized by in situ X-ray reflectivity (XRR) and grazing incidence small angle X-ray scattering (GISAXS) under CO pressure from 0 to 100 bar at 34 °C. GISAXS patterns reveal the formation of a 2-D rectangular structure at a molar ratio R(EO)/Si equal to 0.1. R(EO) micelles have a cylindrical shape, which have a core/shell structure ordered in a hexagonal system. The core contains the R part and the shell is a mixture of (EO) embedded in the silica matrix. We further evidence that the extraction of the template using supercritical carbon dioxide can be successfully achieved. This can be attributed to both the low solubility parameter of the surfactants and the fluorine and ethylene oxide CO-philic groups. The initial 2D rectangular structure was well preserved after depressurization of the cell and removal of the surfactant. We attribute the very high stability of the rinsed film to the large value of the wall thickness relatively to the small pore size.

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Mechanism of Surfactant Removal from Ordered Nanocomposite Silica Thin Films by Deep-UV Light Exposure

Cited by 5 publications

References 14 publications

Neutron Reflectivity Study of Lipid Membranes Assembled on Ordered Nanocomposite and Nanoporous Silica Thin Films

Neutron Reflectivity Study of Lipid Membranes Assembled on Ordered Nanocomposite and Nanoporous Silica Thin Films

Investigating the Interface of Superhydrophobic Surfaces in Contact with Water

Nonionic Fluorinated Surfactant Removal from Mesoporous Film Using sc-CO₂

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Mechanism of Surfactant Removal from Ordered Nanocomposite Silica Thin Films by Deep-UV Light Exposure

Cited by 5 publications

References 14 publications

Neutron Reflectivity Study of Lipid Membranes Assembled on Ordered Nanocomposite and Nanoporous Silica Thin Films

Neutron Reflectivity Study of Lipid Membranes Assembled on Ordered Nanocomposite and Nanoporous Silica Thin Films

Investigating the Interface of Superhydrophobic Surfaces in Contact with Water

Nonionic Fluorinated Surfactant Removal from Mesoporous Film Using sc-CO2

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Product

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Nonionic Fluorinated Surfactant Removal from Mesoporous Film Using sc-CO₂