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Films of mesoporous materials attract broad interest because of their wide applicability in the fields of optics and electronics. Although many of these films have a regular local porous structure ...
1 апр. 2024 г.
Well formed mesoporous silica films from ~0.2 to 1.0 μm thick have been reproducibly grown from the bottom side of a horizon tally held mica substrate. The as-synthesized films were washed with H20 .
Some beetle shells exhibit iridescence owing to the chiral organization of chitin making up the beetle's exoskeleton. Inspired by this, these authors fabricate thin glass films with helical pores ...
Of the many methods used for the deposition of thin films, chemical vapor deposition (CVD) is most often used for semiconductor processing. In order to appreciate the unique problems associated with the CVD of insulating SiO 2 thin films it is worth first reviewing some of their applications.
A continuous mesoporous silica film with uniaxially aligned hexagonal mesochannels was formed on a silica glass substrate using a rubbing-treated thin polyimide coating on the substrate. Polyimide which has a hexamethylene group per the repeating unit as a part of the main chain was used. The mesostructured silica film was grown on the polyimide-coated substrate through the hydrolysis of ...
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Amorphous silicon oxide films have been studied on the basis of electron diffraction (ED) analyses and infrared (IR) spectroscopy in order to elucidate the relationship between the structures. After the heat treatment of the film in air at 300 and 500°C, the ED pattern showed halo rings, and the IR spectra clearly changed. Intensity analysis of the ED pattern provided evidence for the ...
Surface-enhanced Raman scattering (SERS) is an intriguing effect, efficiency of which depends on many factors and whose applicability to a given system is not obvious before the experiment. The ...
The metal-oxide interface has a crucial role in determining the growth of silica thin films. However, only a few metallic substrates have been explored so far. In previous studies, metal substrates exhibiting unreconstructed surfaces under oxygen exposure have been analyzed. In this work, we study the structure of a silica thin film grown on Cu(111) and propose that a copper oxide film ...
Two-dimensional (2D) ultrathin silica films have the potential to reach technological importance in electronics and catalysis. Several well-defined 2D-silica structures have been synthesized so far. The silica bilayer represents a 2D material with ...
Preparation of mesoporous materials in a thin film geometry was first reported in 1996. Recently, improvement of the preparation methods yielded stable films with well-defined symmetries, controlled pore orientation, continuity and film thickness.
15 авг. 2024 г.
Two-dimensional (2D) ultrathin silica films have the potential to reach technological importance in electronics and catalysis. Several well-defined 2D-silica structures have been synthesized so far. The silica bilayer represents a 2D material with SiO[2] ...
The final results show that the mesoporous silica film has few different orders under different acids, the appearance changes by the use of inorganic salts as LiCl leads to formation of three-dimensional network-like ordered mesoporous silica film and the order of the samples can be improved by adding surfactant of CTAB.
In this work, a structural characterization of sputtered silica films was carried out using Raman spectroscopy. Due to the low cross-section and the t…
Here we introduce a new synthetic approach to grow mesoporous silica thin films with vertical mesochannels on centimeter-sized substrates via an oil-induced co-assembly process. Adding an oil, i.e., decane, into a CTAB-EtOH-TEOS ammonia solution leads to thin-film formation of mesoporous silica of controlled thickness between 20 and 100 nm with vertical mesochannels on various surfaces ...
In this study, a flexible 3D nanonetworked silica film (NSF) capable of withstanding mechanical stress during dynamic expansion is constructed to function as a drug delivery platform on an entire SEMS surface.
4 окт. 2024 г.
Placing a porous bilayer silica silicon dioxide (silicon in orange and oxygen in red) film on a metal catalyst enhances chemical reactions by creating confined spaces (blue) in the silica and at the silica-metal interface.
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Passive radiative cooling, which cools an item without any electrical input, has drawn much attention in recent years. In many radiative coolers, silica is widely used due to its high emissivity in the mid-infrared region. However, the performance ...
A novel ultrathin silica film with semi-ordered fingerprint-like mesopores is synthesized with the aid of the dual templates of graphene oxide (go) and tri-block copolymer P123. The formation is proposed to proceed by a co-operative assembly mechanism. As an application, the silica film is used to synthesize a 2D n
Based on the characteristic that silicon coupling agents have the capability to develop 'molecular bridge' in the interface of organic materials and i…
Passive radiative cooling, which cools an item without any electrical input, has drawn much attention in recent years. In many radiative coolers, silica is widely used due to its high emissivity in the mid-infrared region. However, the performance of a bare silica film is poor due to the occurrence …
9 апр. 2025 г.
8 февр. 2024 г.
Silica (SiO x) thin films are promising for a wide range of applications, including catalysis, separation technology, biomedicine, or transparent super-hydrophilic films. Here, we present a study demonstrating a unique way of producing ultra-thin, freestanding silica films via silicon etching.
The as-prepared film demonstrates a hierarchical porous structure with 2D orderly arranged macropores and disorderedly distributed mesopores in the skeleton, as shown in figure 2. The macropores in the film show hexagonal close-packed alignment with the periodicity of 1000 nm and approximate hollow hemispherical shape.
Agilent J&W offers the DB-WAXFF column, a high-polarity, polyethylene glycol (PEG) column, and a close equivalent to USP Phase G16. Visit this DB-WaxFF features page to learn more about the DB-WAXFF GC column.
Unveil the secrets of that stubborn white film! Learn how silica spots, not hardness, may be to blame. Turn to our ICS System with PolyHalt® for relief.
In the present work, a pragmatic painting system with promising active protection property is proposed using electrodeposited silica (e-SiO2) interlay…
Qemetica precipitated silica products can be packaged for shipment in small bags and flexible intermediate bulk containers (FIBCs). Bags are unitized for shipping on pallets that are stretch-wrapped with clear plastic film. FIBCs are single- or double-stacked on wood pallets and stretch-wrapped.
11 нояб. 2024 г.
4 окт. 2024 г.
15 мар. 2025 г.
Supported mesostructured thin films are of major importance for applications in optical, electrochemical and sensing devices. However, good performance is restricted to mesostructured phases ...
Superhydrophobic silica films were deposited onto mild steel substrate for the purpose of corrosion protection. The superhydrophobicity was obtained b…
In recent years, silica films have emerged asa novel class of two-dimensional (2D) materials. Several groups succeeded in epitaxial growth of ultrathi…
The sol-gel method is a straightforward technique that allows electrode modification with silica thin films. Furthermore, the silica pores could be functionalized to enhance the electrical conductivity and reactivity of the silica films. In this ...
In contrast, films produced by the thermal oxidation of silicon for the same study did show a dissipation peak with identical characteristics to the peak observed in bulk silica. This result suggests that the method used to deposit a silica film, and thus the structure of the film, are strongly related to its low temperature dissipation.
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