Synthesemethoden für keramische Materialien. Hochtechnologiewerkstoffe

Riedel, Ralf; Gurlo, Aleksander; Ionescu, Emanuel

doi:10.1002/ciuz.201000512

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…4.1 Sol-gel synthesis of SiO 2 coatings [22] 2 It is more difficult to obtain polymetal-organic siloxanes of linear structure (SiR 2 -O-M) n , где M ¼ Cu, Ni, Co, Mn, where R is carbohydrate radical by hydrolysis of alkyl trichlorsilane, alkali splitting of the formed polysiloxane with the following exchanging reaction of organo silanolate with metal chalcogenide (see for example [27]). …”

Section: Hydrolysismentioning

confidence: 99%

Physics and Chemistry of Sol-Gel Nanocomposites Formation

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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This method called sol-gel or dip-and spin-on-glass process, spin-spray-coating, sol -gel glasses, which was widely used in the second half of the twentieth century [1] 1 is one of the most universal condensation ways of production of nanoparticles stabilized by inorganic oxide or polymeric matrices. A special interest is attracted to materials obtained by combination of sol-gel chemistry and aerosol or spray processes, and combination of sol-gel synthesis with intercalation. This also includes combinations of sol-gel processes with different types of thermolysis, and approaches met in nature in biomineralization processes, etc., which are new aspects of integrative chemistry approach. Traditional sol-gel concept is based on hydrolysis and condensation of metal alkoxides and many metalloids including different ways of their modification [2,3]. Main reactions proceed at relatively low temperatures with usage of prepared in advance or synthesized in parallel polymers, and are convenient techniques for preparation of organic-inorganic nanocomposites compared with commercial silicate-intercalation technique. Sizes of formed nanoparticles in a composite can be reduced to 10 nm by choice of relative conditions. Polymer-inorganic materials have high mechanical strength and thermal stability in combination with optimal heat transport properties. They are widely used in practice due to unique physical and chemical properties: incorporation of nanometric inorganic component into polymeric matrix improves mechanical properties of material [4][5][6][7], permeability of polymers [8]. Light-sensitive materials are used in optic and electronic industry, printed-circuit boards, photoconductive cells, as key elements in solid coatings, packing materials, as cover materials they have good transparency [9][10][11]. For example, sol-gel method was used to produce various polymer/TiO 2 composites with high refractive index [12]. Such type of composites are used for chromatographic carriers, membrane materials, these are the main class of plastics for different applications, including airspace. Controlled properties of the surface of these colloid 1 We refer here to the recent review devoted to celebration of 40th anniversary of innovation researches in polymer-inorganic ceramics produced by sol-gel technique [1].

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Section: Hydrolysismentioning

confidence: 99%

Physics and Chemistry of Sol-Gel Nanocomposites Formation

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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“…Compared with TEOS, perhydropolysilazane (PHPS) is a far better alternative for fabricating crack-reduced, stable, and homogeneous films. PHPS is an inorganic polymer composed of Si–N, Si–H, and N–H bonds, , and its conversion into SiO 2 primarily involves hydrolysis and polycondensation. It undergoes only minor volume change during annealing at 200–400 °C and thus has minimal surface cracks .…”

Section: Introductionmentioning

confidence: 99%

In Situ Metal Deposition on Perhydropolysilazane-Derived Silica for Structural Color Surfaces with Antiviral Activity

Burak,

Rahman,

Seo

et al. 2023

ACS Appl. Mater. Interfaces

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Structural coloration has recently sparked considerable attention on the laboratory and industrial scale. Structural colors can create vivid, saturated, and long-lasting colors on metallic surfaces for optical filters, digital displays, and surface decoration. This study used an all-solution, low-cost method, free of a specific setup procedure, to fabricate structural colors of a multilayered metal-dielectric structure based on interference effects within a Fabry–Perot cavity. The insulating (dielectric) layer was produced from perhydropolysilazane, an inorganic silicon-containing polymer, from which hydrogen was liberated during conversion into silica and applied in situ to reduce metallic nanoparticles on the silica surface. This simple manufacturing technique contributes to the fabrication of large, high-quality surfaces, which could potentially be employed for surface decoration. The fabricated surfaces also exhibited excellent hydrophobic properties with contact angles up to 137°, endowing them with self-cleaning properties. In addition, the antiviral and antibacterial impact of the silver (Ag)/silica (SiO2)/stainless steel (SUS) film was also examined, as Ag has been reported to have antimicrobial and, recently, antiviral properties. According to three independently conducted antiviral assays, the fluorescence expression of virus-infected cells, PCR analysis, and modified tissue culture infectious dose assay, the film inhibited lentivirus by 75, 97, and 99% when exposed to the virus for 20 min, 1 h, and 20 min, respectively. Furthermore, the film had exceptional antibacterial activity with no colony growth observed for 24 and 12 h of inoculation. It is thus conceivable that these structural color-based films can be used to not only decorate metal surfaces with aesthetic colors but also limit virus and bacterium propagation successfully.

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“…poly(carbo)silanes, poly(carbo)silazanes or polysiloxanes, which upon shaping and pyrolysis lead to silicon carbide (SiC), silicon carbonitride (SiCN) or silicon oxycarbide (SiOC) based ceramic parts. [7] In the first step the preceramic polymer is cross-linked and shaped to furnish micro structured green bodies. In the second step the green bodies are thermally treated in inert or reactive gas atmosphere at temperatures in the range from 1000 to 1400 °C (pyrolysis step).…”

Section: Introductionmentioning

confidence: 99%