Synthesis of multilayered silica-based hybrid films from difunctional organosilanes by co-hydrolysis and polycondensation with tetraalkoxysilane

Umeda, Noritaka; Shimojima, Atsushi; Kuroda, Kazuyuki

doi:10.1016/s0022-328x(03)00619-3

Cited by 8 publications

(2 citation statements)

References 19 publications

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“…34 The length of the second alkyl chain (ethyl or decyl) had a large effect on the formation of ordered hybrid films. In the case of 5, transparent films of wellordered lamellar hybrids were formed with various TMOS/5 ratios by controlling the degree of polycondensation (i.e., reaction time) before film formation.…”

Section: Variation Of the Number Of Covalently Attached Organic Groupsmentioning

confidence: 99%

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

2006

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This paper reports on recent progress in the synthesis of nanostructured siloxane-organic hybrids based on the self-assembly of amphiphilic silicon-based precursors. A variety of ordered hybrid materials have been obtained by molecular design of the precursors. Alkoxysilanes and chlorosilanes with covalently attached hydrophobic organic tails are hydrolyzed to form amphiphilic molecules containing silanol groups, leading to the formation of layered (lamellar) structures. Transparent and oriented thin films of lamellar hybrids were prepared by the reaction in the presence of tetraalkoxysilane. In addition, the design of molecules having alkyl chains and large oligosiloxane heads led to the formation of mesophases consisting of cylindrical assemblies, providing a direct pathway to ordered porous silica. The synthesis, structural features, and formation processes of these hybrid mesostructures are discussed.

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Section: Variation Of the Number Of Covalently Attached Organic Groupsmentioning

confidence: 99%

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

2006

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“…We have also demonstrated the formation of lamellar hybrid films by using dialkyldimethoxysilanes with longer second alkyl chains (ethyl or decyl). 26) Thus the structural modification of the lamellar hybrid films at the molecular scale has been achieved.…”

Section: Role Of Tetraalkoxysilane On Self-assemblymentioning

confidence: 99%

Design of nanohybrid and nanoporous materials through self-assembly of organosilane molecules

Shimojima

2008

J. Ceram. Soc. Japan

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Structural control of silica-based materials prepared by sol-gel chemistry is important from both fundamental and practical viewpoints. This paper reviews our work on the synthesis of ordered siloxane-based nanomaterials by self-assembly of organosilane-based precursors. Lamellar siloxane-organic hybrids with various structures, macroscopic morphologies, and properties have been prepared from long-chain alkyltrialkoxysilanes or organoalkoxysilane-tetraalkoxysilane mixtures by selfassembly during hydrolysis and polycondensation. Furthermore, the molecular design of novel alkylsiloxane precursors having a large oligosiloxane head led to the formation of hybrid mesostructures consisting of cylindrical assemblies that gave ordered microporous or mesoporous silica by calcination. These results open a new self-assembly route to the design of ordered nanoporous materials as well as nanohybrid materials without the use of any templates or structure-directing agents.

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Ordered Hybrids from Template‐Free Organosilane Self‐Assembly

Chemtob

Croutxé‐Barghorn

et al. 2014

Chemistry A European J

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Despite considerable achievements over the last two decades, nonporous organic-inorganic hybrid materials are mostly amorphous, especially in the absence of solvothermal processes. The organosilane self-assembly approach is one of the few opportunities for creating a regular assembly of organic and inorganic moieties. Additionally, well-established organosilicon chemistry enables the introduction of numerous organic functionalities. The synthesis of periodically ordered hybrids relies on mono-, bis-, or multisilylated organosilane building blocks self-assembling into hybrid mesostructures or superstructures, subsequently cross-linked by siloxane Si-O-Si condensation. The general synthesis procedure is template-free and one-step. However, three concurrent processes underlie the generation of self-organized hybrid networks: thermodynamics of amphiphilic aggregation, dynamic self-assembly, and kinetically controlled sol-gel chemistry. Hence, the set of experimental conditions and the precursor structure are of paramount importance in achieving long-range order. Since the first developments in the mid-1990s, the subject has seen considerable progress leading to many innovative advanced nanomaterials providing promising applications in membranes, pollutant remediation, catalysis, conductive coatings, and optoelectronics. This work reviews, comprehensively, the primary evolution of this expanding field of research.

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Synthesis of multilayered silica-based hybrid films from difunctional organosilanes by co-hydrolysis and polycondensation with tetraalkoxysilane

Cited by 8 publications

References 19 publications

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

Design of nanohybrid and nanoporous materials through self-assembly of organosilane molecules

Ordered Hybrids from Template‐Free Organosilane Self‐Assembly

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