Abstract:
The present invention provides a method for the selective placement of carbon nanotubes on a particular surface. In particular, the present invention provides a method in which self-assembled monolayers formed on an unpatterned or patterned metal oxide surface are used to attract or repel carbon nanotubes from a dispersion containing the same. In accordance with the present invention, the carbon nanotubes can be attracted to the self-assembled monolayers so as to be attached to the metal oxide surface, or they can be repelled by the self-assembled monolayers bonding to a predetermined surface other than the metal oxide surface containing the self-assembled monolayers.
Abstract:
An elastomeric stamp (10) is provided, which has a bulk surface (12) from which protruding features (14, 14′) extend. A barrier layer (20) covers the bulk surface (12) and the protruding features (14, 14′). After applying an ink solution to the elastomeric stamp (10) and drying the elastomeric stamp (10), the elastomeric stamp (10) is brought into contact with a surface (42) of a first substrate (40). The surface (42) of the first substrate (40) has a high affinity with the ink molecules (32), which is utilized to effectively remove the ink molecules (32) from the contact surfaces (16, 16′) of the protruding features (14, 14′). Subsequently, the elastomeric stamp (10) is brought into contact with the surface (52) of a second substrate (50). Ink molecules 32 are transferred from the edges (18, 18′) of the protruding features (14, 14′) to the surface (52) of a second substrate (50), thus forming an ink pattern in the form of a selfassembled monolayer on this surface (52). The patterning method of the present invention allows for the formation of high-definition ink patterns on a substrate (50) using a wide variety of inks.
Abstract:
A method of forming a SAM on at least one surface of a substrate by application to said surface of a 2-mono-, or 2,2-disubstituted 1,3-dithiacyclopentane so as to form a SAM prepared therefrom on said surface.
Abstract:
The present invention provides a method for the selective placement of carbon nanotubes on a particular surface. In particular, the present invention provides a method in which self-assembled monolayers formed on an unpatterned or patterned metal oxide surface are used to attract or repel carbon nanotubes from a dispersion containing the same. In accordance with the present invention, the carbon nanotubes can be attracted to the self-assembled monolayers so as to be attached to the metal oxide surface, or they can be repelled by the self-assembled monolayers bonding to a predetermined surface other than the metal oxide surface containing the self-assembled monolayers.
Abstract:
Composite materials having colloidal photonic crystals patterned in substrates for use in different technologies including lab-on-chip and photonic chip technologies. The colloidal crystals are patterned either on or within surface relief patterns in the substrates of the composite materials and each colloidal crystal exhibits Bragg diffraction.
Abstract:
The invention relates to micro-contact printing, wherein a self-assembled monolayer(SAM)-forming molecular species (1) is applied to a surface (2) of an article (3). The SAM-forming species (1) comprise a polar functional group that is exposed when the species (1) form a monolayer. This enables said printing method to be performed in vacuum or in a gaseous atnosphere, preferably in air. The invention also relates to an article having a surface comprising at least one isolated region of a SAM having a lateral dimension within the range of from 1 to 100 nm. Furthermore, the invention relates to a method for producing at least one nanowire, or a grid of nanowires, having a lateral dimension within the range of from 1 to 100 nm.
Abstract:
Aliphatic dithiocarboxylic acid compositions (ADTCAs) that form self-assembled monolayers (SAMs) on metal surface such as gold surfaces are disclosed. These new SAMs were characterized by optical ellipsometry, contact angle goniometry, and polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS). The data indicates that the ADTCAs generate well packed and highly oriented monolayer films on gold surfaces. A method for using the ADTCAs in micro-contact printing is also disclosed, where ADTCA SAM protected regions are capable of more efficient cleaning under mild conditions due to instabilities in the ADTCA compositions.
Abstract:
A process and apparatus for processing a monolayer film and transferring the monolayer film to a substrate are provided. In accordance with one embodiment of the present invention, a process for transferring a monolayer film to a substrate is provided comprising the steps of: (i) providing a water-based carrier media defining an upper surface; (ii) introducing process particles on the upper surface of the carrier media, wherein the molecules are dissolved in a solvent and the particles and the solvent are insoluble in the carrier media; (iii) evaporating the solvent such that a non-cohesive monolayer film of the particles is formed on the upper surface of the carrier media; (iv) decreasing a degree of void incorporation in the monolayer film of particles by compressing a dimension of the non-cohesive film along the upper surface of the carrier media, and sonicating the carrier media to form micro-bubbles in the carrier media, wherein the compression and the sonication contribute to a decreased degree of void incorporation in the film of process particles; and (v) transferring the film of particles to a surface of the substrate. The steps of compressing and sonicating may be executed concurrently.
Abstract:
A process and apparatus for processing a monolayer film and transferring the monolayer film to a substrate are provided. In accordance with one embodiment of the present invention, a process for transferring a monolayer film to a substrate is provided comprising the steps of: (i) providing a water-based: carrier media defining an upper surface; (ii) introducing process particles on the upper surface of the carrier media, wherein the molecules are dissolved in a solvent and the particles and the solvent are insoluble in the carrier media; (iii) evaporating the solvent such that a non-cohesive monolayer film of the particles is formed on the upper surface of the carrier media; (iv) decreasing a degree of void incorporation in the monolayer film of particles by compressing a dimension of the non-cohesive film along the upper surface of the carrier media, and sonicating the carrier media to form micro-bubbles in the carrier media, wherein the compression and the sonication contribute to a decreased degree of void incorporation in the film of process particles; and (v) transferring the film of particles to a surface of the substrate. The steps of compressing and sonicating may be executed concurrently.
Abstract:
This invention describes methods of synthesis and applications of planarized photonic crystals. Provided are simple, quick, reproducible and inexpensive methods that combine self-assembly and lithography to achieve the first examples of vectorial control of thickness, structure, area, topology, orientation and registry of colloidal crystals that have been patterned in substrates for use in lab-on-chip and photonic chip technologies. 1-, 2 and 3-D colloidal crystals patterned either on or within substrates can be used for templating inverted colloidal crystal replica patterns made of materials like silicon as well as building micron scale structural defects in such colloidal crystals. These photonic crystals can form the basis of a range of optical devices that may be integrated within photonic chips and coupled to optical fibers and/or waveguides to enable development of highly compact planarized optically integrated photonic crystal devices and circuits for use in future all-optical computers and optical telecommunication systems.