Directed assembly of micro- and nano-structures

Summary

Directed assembly of micro- and nano-structures are methods of mass-producing micro to nano devices and materials. Directed assembly allows the accurate control of assembly of micro and nano particles to form even the most intricate and highly functional devices or materials. Directed self-assembly Directed self-assembly (DSA) is a type of directed assembly which utilizes block co-polymer morphology to create lines, space and hole patterns, facilitating for a more accurate control of the feature shapes. Then it uses surface interactions as well as polymer thermodynamics to finalize the formation of the final pattern shapes. To control the surface interactions enabling sub-10 nm resolution, a team consisting of Massachusetts Institute of Technology, University of Chicago, and Argonne National Laboratory developed a way to use vapor-phase deposited polymeric top layer on the block co-polymer film in 2017. The DSA is not a standalone process, but rather is integrated wit

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https://en.wikipedia.org/wiki/Directed_assembly_of_micro-_and_nano-structures

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Modelling the Size Effects on the Mechanical Properties of Micro/Nano Structures

Amir Musa Abazari, Luis Guillermo Villanueva Torrijo

Experiments on micro- and nano-mechanical systems (M/NEMS) have shown that their behavior under bending loads departs in many cases from the classical predictions using Euler-Bernoulli theory and Hooke's law. This anomalous response has usually been seen as a dependence of the material properties on the size of the structure, in particular thickness. A theoretical model that allows for quantitative understanding and prediction of this size effect is important for the design of M/NEMS. In this paper, we summarize and analyze the five theories that can be found in the literature: Grain Boundary Theory (GBT), Surface Stress Theory (SST), Residual Stress Theory (RST), Couple Stress Theory (CST) and Surface Elasticity Theory (SET). By comparing these theories with experimental data we propose a simplified model combination of CST and SET that properly fits all considered cases, therefore delivering a simple (two parameters) model that can be used to predict the mechanical properties at the nanoscale.

MDPI Ag2015

Modelling the Size Effects on the Mechanical Properties of Micro/Nano Structures (vol 15, 28543, 2015)

Amir Musa Abazari, Luis Guillermo Villanueva Torrijo

Mdpi Ag2016

Three-dimensional microfabrication through a multimode optical fiber

Donald Benjaman Conkey, Edgar Emilio Morales Delgado, Christophe Moser, Demetri Psaltis, Nicolino Stasio, Loïc Urio

3D printing based on additive manufacturing is an advanced manufacturing technique that allows the fabrication of arbitrary macroscopic and microscopic objects. Many 3D printing systems require large optical elements or nozzles in proximity to the built structure. This prevents their use in applications in which there is no direct access to the area where the objects have to be printed. Here, we demonstrate three-dimensional microfabrication based on two-photon polymerization (TPP) through an ultra-thin printing nozzle of 560 mu m in diameter. Using wavefront shaping, femtosecond infrared pulses are focused and scanned through a multimode optical fiber (MMF) inside a photoresist that polymerizes via two-photon absorption. We show the construction of arbitrary 3D structures built with voxels of diameters down to 400 nm on the other side of the fiber. To our knowledge, this is the first demonstration of microfabrication through a multimode optical fiber. The proposed printing nozzle can reach and manufacture micro-structures in otherwise inaccessible areas through small apertures. Our work represents a new area which we refer to as endofabrication. (C) 2017 Optical Society of America

Optical Soc Amer2017