Polystyrene Layers Grafted to Epoxy-Modified Silicon Surfaces

Luzinov, Igor; Julthongpiput, Duangrut; Malz, Hauke; Pionteck, Jürgen; Tsukruk, Vladimir V.

doi:10.1021/ma990926v

Cited by 193 publications

(249 citation statements)

References 31 publications

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“…Molecular structures and peak assignment, as reported in Table 1, are shown. [31]. The ability of functionalized particles to be dispersed in organic matrices was tested by simply mixing pristine TiO 2 , TiO 2 -PA, TiO 2 -EA and TiO 2 -MA with water and diethyl ether.…”

Section: Characterization Of Pristine and Functionalized Tio 2 Nanopamentioning

confidence: 99%

TiO2 nanocrystals grafted on macroporous silica: A novel hybrid organic–inorganic sol–gel approach for the synthesis of highly photoactive composite material

Crippa

Callone

D’Arienzo

et al. 2011

Applied Catalysis B: Environmental

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a b s t r a c tTiO 2 -SiO 2 composite materials with photocatalytic properties similar to those of slurry powdered TiO 2 is obtained by a novel sol-gel synthetic strategy involving the hydrolysis/condensation of TMOS assisted by PEG as templating agent and the grafting of preformed titania nanocrystals onto the macropore walls of the silica matrix. In order to anchor TiO 2 particles to the surface of SiO 2 , avoiding their embedding into silica matrix, functionalization with carboxylic acid or amine derivatives was carried out. The functionalization induces the confinement of titania nanocrystals in PEG, during the silica formation, and allows their dispersion on the silica surface. TiO 2 -SiO 2 materials exhibit high thermal and chemical stability and a photocatalytic activity in the phenol mineralization comparable to that of powder TiO 2 in slurry (half degradation time ∼120 min). These results suggest that the immobilization procedure here reported provides high accessibility of the catalyst active sites preserving the functional properties of the photoactive catalyst.

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Section: Characterization Of Pristine and Functionalized Tio 2 Nanopamentioning

confidence: 99%

TiO2 nanocrystals grafted on macroporous silica: A novel hybrid organic–inorganic sol–gel approach for the synthesis of highly photoactive composite material

Crippa

Callone

D’Arienzo

et al. 2011

Applied Catalysis B: Environmental

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“…The grafting density can be also defined as a function of the distance between grafted points (D): 14,31 The size of an isolated chain in a good solvent is given by the Flory radius where N is the number of monomer units and a is the statistical segment length. …”

Section: Scheme 1 Schematic Representation Of Silicon Wafer Surface mentioning

confidence: 99%

“…14,15 High grafting densities and relatively thick layers are difficult to realize with the grafting to technique due to the repulsive forces between polymer chains that are already attached and non-grafted polymer chains that are entering. Radical polymerization, and especially atom transfer radical polymerization (ATRP), is a very suitable procedure to grow polymer brushes from a surface because it allows a good control over the grafting density and brush thickness.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Surface-Grafted Polyacrylamide Brushes and Their Inhibition of Microbial Adhesion

et al. 2007

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A method is presented to prevent microbial adhesion to solid surfaces exploiting the unique properties of polymer brushes. Polyacrylamide (PAAm) brushes were grown from silicon wafers by atom transfer radical polymerization (ATRP) using a three-step reaction procedure consisting of immobilization of a coupling agent γ-aminopropyltriethoxysilane, anchoring of an ATRP initiator 4-(chloromethyl)benzoyl chloride, and controlled radical polymerization of acrylamide. The surfaces were characterized by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, ellipsometry, and contact-angle measurements. The calculated grafting density pointed to the presence of a dense and homogeneous polymer brush. Initial deposition rates, adhesion after 4 h, and detachment of two bacterial strains (Staphylococcus aureus ATCC 12600 and Streptococcus salivarius GB 24/9) and one yeast strain (Candida albicans GB 1/2) to both PAAm-coated and untreated silicon surfaces were investigated in a parallel plate flow chamber. A high reduction (70−92%) in microbial adhesion to the surface-grafted PAAm brush was observed, as compared with untreated silicon surfaces. Application of the proposed grafting method to silicone rubbers may offer great potential to prevent biomaterials-centered infection of implants.

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“…28 Immobilization of polymers using spin coating or casting films on solid substrates using silane coupling agents has been developed. [29][30][31] However, the orientation, molecular packing, and smoothness remain insufficient for coating in surface nanotechnology. In this respect, self-assembled monolayers (SAMs) and Langmuir-Blodgett (LB) films are attractive because of their closely packed and well-ordered structures.…”

Section: Monolayer Formation and Lb Film Deposition For Fluorinated Pmentioning

confidence: 99%

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

Mitsuishi

Matsui

Miyashita

2006

Polym J

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ABSTRACT:This review describes recent topics on functional organized molecular assemblies based on ''polymer nano-sheet''. Polymer nano-sheets consisting of amphiphilic poly(alkylacrylamide)s are described as ultrathin polymer Langmuir-Blodgett films through two-dimensional hydrogen networks between polymer backbones, which have been developed to assemble various functional molecules and nanomaterials such as metal and magnetic nanoparticles. Surface modification and nanocoating using fluorinated polymer nano-sheets in confined area are given. Multicolored patterns based on structured color and photopatterning derived from nanostructures are demonstrated. The scope of polymer nano-sheets concerning the bottom-up soft nanodevice is also reviewed. [doi:10.1295/polymj.PJ2006069] KEY WORDS Polymer / Langmuir-Blodgett / Nano-sheet / Thin Film / Acrylamide / Bottom-up approaches for constructing ordered nanoscale structures in organic molecular assemblies are of interest and various techniques for preparation of organic ultrathin films have been extensively studied. Organic thin films are attractive materials for processability, ease of functionalization, light weight, and flexibility. However processing technology on a nanoscale is immature and continuous development is required. Various organic films, for example, a spincoated film, self-assembled monolayers (SAM), 1 polymer brushes, and layer-by-layer alternative adsorption via electrostatic interactions, 2 have been investigated. We have tried to prepare various polymer ultrathin films with the Langmuir-Blodgett (LB) technique. [3][4][5][6] It has been found that N-alkylacrylamide polymer shows highly oriented and well ordered monolayer at the air/water interface. Two-dimensional network of the polymer chains via hydrogen bonding interaction of amide groups on the water surface gives a stable and condensed polymer monolayer (Figure 1). A wide variety of functional molecules were incorporated in the monolayer through copolymerization method 7 and polyion complex method etc. The advantages of the polymer nano-sheet are (1) thermal and mechanical stability, (2) uniform distribution of functional molecules, and (3) ultrathin films at the nanometer scale ranged from 1.0 nm to 2.0 nm and (4) versatile molecular building blocks. Various functional polymer nano-sheets allow fabrication of soft nanodevices based on their integrated assemblies. This review shows the definition and fascinating features of polymer nano-sheets at the first session and describes recent topics of polymer nanoarchitecture based on polymer nano-sheets; fluorination of polymer nanosheets, structured color by three-dimensional nanoassemblies, conductive polymer nano-sheets and molecular logic gates driven by photo-excitation. Hybrid nanomaterials consisting of polymer nano-sheets and metal nanoparticles are also demonstrated for efficient localized surface plasmon resonance utilization. POLYMER NANO-SHEETS BY LANGMUIR-BLODGETT TECHNIQUEThe Langmuir-Blodgett (LB) technique is a powerful means for pre...

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Polystyrene Layers Grafted to Epoxy-Modified Silicon Surfaces

Cited by 193 publications

References 31 publications

TiO2 nanocrystals grafted on macroporous silica: A novel hybrid organic–inorganic sol–gel approach for the synthesis of highly photoactive composite material

TiO2 nanocrystals grafted on macroporous silica: A novel hybrid organic–inorganic sol–gel approach for the synthesis of highly photoactive composite material

Synthesis and Characterization of Surface-Grafted Polyacrylamide Brushes and Their Inhibition of Microbial Adhesion

Functional Organized Molecular Assemblies Based on Polymer Nano-sheets

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