Nanotechnology

Facile patterning of upconversion NaYF4:Yb, Er nanoparticles

Abstract

Different kinds of highly ordered patterns of NaYF4:Yb, Er nanoparticles on gold substrates were fabricated using a simple method combining micro-contact printing and “breath figures” techniques. Ordered arrays of water droplets were first formed in the hydrophilic regions of patterned self-assembled monolayers (SAMs). This was subsequently submerged in a chloroform solution of NaYF4:Yb, Er nanoparticles. The particles were spontaneously assembled at the interface of chloroform/water droplet surface, leading to different kinds of uniform patterns after solvent evaporation. The structures of NaYF4:Yb, Er particles patterns depended on the dimension of the substrate, the concentration of the NaYF4:Yb, Er nanoparticles and the water condensation process.

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Facile patterning of upconversion NaYF4:Yb, Er nanoparticles

Soft lithography device and method

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method capable of easily and efficiently controlling the application pressure of a stamp or a macro-stamp for soft lithography on a surface of a substrate, and progressing automation. ; SOLUTION: The device for soft lithography by transfer includes a flexible stamp capable of achieving a deposit of a micro-structure or a nano-structure on a substrate. In the device, the flexible stamp 1 is constituted of: a layer 3 formed of an elastomer and including a structure surface 31 capable of achieving the deposit by transfer on its one surface; and a second layer 2 which is formed of an elastomer in a state of being closely connected to a surface of the first layer 3 facing the structure surface, and formed of an elastomer with particles each formed of a soft ferromagnetic material dispersed therein

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Soft lithography device and method

Soft lithography for micro- and nanoscale patterning

Abstract

This protocol provides an introduction to soft lithography—a collection of techniques based on printing, molding and embossing with an elastomeric stamp. Soft lithography provides access to three-dimensional and curved structures, tolerates a wide variety of materials, generates well-defined and controllable surface chemistries, and is generally compatible with biological applications. It is also low in cost, experimentally convenient and has emerged as a technology useful for a number of applications that include cell biology, microfluidics, lab-on-a-chip, microelectromechanical systems and flexible electronics/photonics. As examples, here we focus on three of the commonly used soft lithographic techniques: (i) microcontact printing of alkanethiols and proteins on gold-coated and glass substrates; (ii) replica molding for fabrication of microfluidic devices in poly(dimethyl siloxane), and of nanostructures in polyurethane or epoxy; and (iii) solvent-assisted micromolding of nanostructures in poly(methyl methacrylate).

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Soft lithography for micro- and nanoscale patterning

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