Inorganic—Organic Hybrid Coatings for Metal and Glass Surfaces

Schmidt, Helmut K.; Kasemann, Reiner; Burkhart, Thomas; Wagner, Gabriele; Arpaç, Ertuğrul; Geiter, Elisabeth

doi:10.1021/bk-1995-0585.ch026

Cited by 27 publications

(9 citation statements)

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“…In order to obtain the described properties, particle size and aggregation have to be controlled carefully. As shown by Sanchez and In [9], NaB [10] and Schmidt et al [11], the size of colloids can be influenced by additives during the hydrolysis and condensation process. The model suggested in Ref.…”

Section: Basic Considerations and Control Of Particle Size In Solsmentioning

confidence: 99%

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Organically modified silicates and ceramics as two-phasic systems: Synthesis and processing

Schmidt

1997

J Sol-Gel Sci Technol

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Abstract. Based on the concept of controlling the particle size by the surface free energy, the growth of sol-gel derived nanoparticles (A1203, Tit2, ZrO2) has been investigated in presence of molecules with binding ability to the growing particles. The investigations show that the use of silanes, carboxylic acid or fl-diketones allows to replace electrostatic sol stabilisation by steric sol stabilisation and through this, high solid content sols can be obtained. The introduction of these sols into organic or ormocer type of matrices leads to nano composites with degrees of filling up to 40 wt.-% without agglomeration and with high optical quality. Already developed Tit2 containing bulk materials, ultrahard coatings on plastic and adhesives for fiber to chip coupling are examples for the usefulness of this alternative sol-gel route. The nanocomposite materials show interesting mechanical and thermomechanical properties such as high hardness or low thermal expansion compared to unfilled systems.

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Section: Basic Considerations and Control Of Particle Size In Solsmentioning

confidence: 99%

“…The model suggested in Ref. [11] so far is related to a control of the surface free energy cr during the nucleation and growth process. In a nucleation process the nucleation frequency I is the most important step.…”

Section: Basic Considerations and Control Of Particle Size In Solsmentioning

confidence: 99%

Organically modified silicates and ceramics as two-phasic systems: Synthesis and processing

Schmidt

1997

J Sol-Gel Sci Technol

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“…121 It has been shown that the addition of nanoparticles, especially in combination with epoxy silanes, which act as an inorganic as well as an organic crosslinking agent, leads to a substantial increase of the abrasion resistance of such systems without losing any transparency. 122,123 For the application of these systems on polycarbonate as a transparent scratch-resistant coating, a very specific processing route has been developed. In general, the abrasion resistance of transparent coatings is measured by the decay of transmission by the scattered light after an abrasion treatment by the taber abrader test (two aluminafilled rubber wheels with 500 g load are abraded on a 10 Â 10 cm 2 plate).…”

Section: Nanocomposite Hard Coatingsmentioning

confidence: 99%

“…The addition of Zr(OR) 4 alkoxides, which immediately forms nZrO 2 , leads to the highest average profiles. This can be explained by the ZrO 2 acting as a condensation catalyst 123 as well as an immobilizer for FTS at the same time. To find out how thick the fluorineenriched layer is, an SNMS analysis of the NaOH system has been carried out.…”

mentioning

confidence: 99%

Nanoparticles by chemical synthesis, processing to materials and innovative applications

Schmidt

2001

Applied Organom Chemis

142

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Nanoparticles have been fabricated by using chemical synthesis routes under specific conditions. During a precipitation process from liquid phases, surface controlling agents (SCAs) have been added during or shortly after the formation of precipitates. These interfere with the nucleating and growing particle to avoid agglomeration and to control size. Nanoparticles from many systems have been fabricated. If the SCAs are bifunctional, the surfaces chemistry could be tailored and the zeta potential of these particles was tailored also. SiO 2 particles have been used for gene targeting using this approach. In other investigations, FeO x nanoparticles have been surface modified by amino groupings together with a sonochemical route to obtain very stable coatings. These particles have been used for in vitro tumor cell penetration and hyperthermal treatment. Boehmite nanoparticles were used to serve as condensation catalysts to prepare very hard transparent coatings for polycarbonate and an overcoat with polymerizable nanoparticles was used to produce anti-reflective and ultrahard coatings. In systems with incorporated fluoro silanes, leading to low surface free energy coatings, nanoparticles were used to tailor the fluorine depth profile in self-aligning transparent easy-to-clean coatings by influencing the critical micelle concentration. The examples show the usefulness of the chemical nanoparticle approach for nanocomposite fabrication and the high potential of these materials for medical and industrial application.

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“…These materials, commonly known as creamers, 4,5 combine the advantages of both organic and inorganic materials and may be expected to possess even new properties that individual components may not have. As the inorganic oxides are usually thermally very stable, the best candidates from the organic side can be those polymers 6,7 that are thermally stable.…”

Section: Introductionmentioning

confidence: 99%

Morphology and thermo‐mechanical properties of compatibilized polyimide‐silica nanocomposites

Al-Kandary

Ali

Ahmad

2005

J of Applied Polymer Sci

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Polyimide-silica nanocomposites have been prepared from an aromatic polyamic acid derived from pyromellitic dianhydride and oxydianiline and a silica network using the sol-gel reaction. Compatibilization of the two components was achieved by modifying the silica network with imide linkages. Morphology, thermal, and mechanical properties of these composite materials were studied as a function of silica content and compared with the one in which reinforcement of the polyimide was achieved using a pure silica network. There was considerable reduction in the silica particle size with more homogeneous distribution in the matrix when imide spacer groups were introduced in the silica network. The tan ␦ spectra obtained from dynamic thermal mechanical analysis shows a large increase in the glass transition temperature with increasing silica content for the compatibilized system in contrast to the un-compatibilized one. Mechanical properties of the polyimide composites improved due to better interaction between the organic and inorganic phases.

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Inorganic—Organic Hybrid Coatings for Metal and Glass Surfaces

Cited by 27 publications

References 0 publications

Organically modified silicates and ceramics as two-phasic systems: Synthesis and processing

Organically modified silicates and ceramics as two-phasic systems: Synthesis and processing

Nanoparticles by chemical synthesis, processing to materials and innovative applications

Morphology and thermo‐mechanical properties of compatibilized polyimide‐silica nanocomposites

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