scholarly journals HIGHLY STABLE SURFACE FUNCTIONALIZATION OF HIGH-ASPECT-RATIO MICROGAS CHROMATOGRAPHY COLUMNS USING LAYER-BY-LAYER SELF-ASSEMBLY OF SIO2 NANOPARTICLES

2012 ◽  
Author(s):  
D. Wang ◽  
H. Shakeel ◽  
G. Rice ◽  
J.R. Heflin ◽  
M. Agah ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Surface Functionalization ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Sio2 Nanoparticles ◽  
Layer By Layer ◽  
Stable Surface ◽  
Chromatography Columns

scholarly journals Highly Stable Surface Functionalization of Microgas Chromatography Columns Using Layer-by-Layer Self-Assembly of Silica Nanoparticles

2013 ◽  
Vol 85 (17) ◽  
pp. 8135-8141 ◽  
Author(s):  
Dong Wang ◽  
Hamza Shakeel ◽  
John Lovette ◽  
Gary W. Rice ◽  
James R. Heflin ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Surface Functionalization ◽  
Self Assembly ◽  
Layer By Layer ◽  
Stable Surface ◽  
Chromatography Columns

Cooperative Self-Assembly of Pyridine-2,6-Diimine-Linked Macrocycles into Mechanically Robust Nanotubes

2019 ◽  
Author(s):  
Michael J. Strauss ◽  
Darya Asheghali ◽  
Austin Evans ◽  
Rebecca Li ◽  
Anton Chavez ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Synthetic Polymers ◽  
Young’S Moduli ◽  
Structural Rigidity ◽  
Assembly Mechanism ◽  
Low Dimensionality ◽  
Harsh Conditions

<p>Nanotubes assembled from macrocyclic precursors offer a unique combination of low dimensionality, structural rigidity, and distinct interior and exterior microenvironments. Usually the weak stacking energies of macrocycles limit the length or strength of the resultant nanotubes. Imine-linked macrocycles were recently found to assemble into high-aspect ratio (>10<sup>3</sup>), lyotropic nanotubes in the presence of excess acid. Yet these harsh conditions are incompatible with many functional groups and processing methods, and lower acid loadings instead catalyze macrocycle degradation. Here we report pyridine-2,6-diimine-linked macrocycles that assemble into high-aspect ratio nanotubes in the presence of less than 1 equiv of CF<sub>3</sub>CO<sub>2</sub>H per macrocycle. Analysis by gel permeation chromatography and fluorescence spectroscopy revealed a cooperative self-assembly mechanism. Nanofibers obtained by touch-spinning the pyridinium-based nanotubes exhibit Young’s moduli of 1.48 GPa, which exceeds that of many synthetic polymers and biological filaments. These findings will enable the design of structurally diverse nanotubes from synthetically accessible macrocycles. </p>

Photopolymerization-assisted self-assembly as a strategy to obtain a dispersion of very high aspect ratio nanostructures in a polystyrene matrix

2019 ◽  
Vol 112 ◽  
pp. 704-713 ◽  
Author(s):  
Ú.M. Montoya Rojo ◽  
C.C. Riccardi ◽  
M.D. Ninago ◽  
A.E. Ciolino ◽  
M.A. Villar ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Polystyrene Matrix ◽  
Very High

scholarly journals High-aspect-ratio mushroom-like silica nanopillars immersed in air: epsilon-near-zero metamaterials mediated by a phonon-polaritonic anisotropy

RSC Advances ◽  
2019 ◽  
Vol 9 (29) ◽  
pp. 16431-16438
Author(s):  
Kota Ito ◽  
Yuri Yamada ◽  
Atsushi Miura ◽  
Hideo Iizuka
Keyword(s):  
Block Copolymers ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Infrared Range ◽  
Mid Infrared ◽  
Zero Response ◽  
Epsilon Near Zero

High-aspect-ratio mushroom-like silica nanopillars fabricated from self-assembly of block-copolymers exhibit a uniaxial epsilon-near-zero response in the mid-infrared range.

Preparation of Very Reactive Thiol-Protected Gold Nanoparticles: Revisiting the Brust-Schiffrin Method

2006 ◽  
Vol 6 (3) ◽  
pp. 708-712 ◽  
Author(s):  
Koiti Araki ◽  
Eisuke Mizuguchi ◽  
Hirofumi Tanaka ◽  
Takuji Ogawa
Keyword(s):  
Thin Films ◽  
Gold Nanoparticles ◽  
Surface Functionalization ◽  
Self Assembly ◽  
Gold Clusters ◽  
Layer By Layer ◽  
Inorganic Hybrid ◽  
New Material ◽  
Modified Surface ◽  
Layer Control

The preparation and properties of tert-dodecanethiol protected gold nanoparticles amenable to very rapid surface functionalization by associative mechanism is described. The new material can be easily prepared by controlling the reaction time, because only a limited but enough number of tert-dodecanethiol to stabilize the gold clusters is bond to the surface until about an hour. Accordingly, it can be isolated as a solid and handled much like the highly stabilized Brust-Schiffrin analogues, but reacted very rapidly with any molecular species containing one or multiple functional groups such as thiol, disulfide, pyridine, etc., These characteristics are ideal for the preparation of a variety of new organic–inorganic hybrid nanomaterials by coordinative self-assembly. This possibility was illustrated using meso-tetra(4-pyridyl)porphyrin, which promptly bonded to the reactive protected gold nanoparticles generating a solid that can be grown as thin films with layer-by-layer control on a suitably modified surface.

Fabrication and surface functionalization of high aspect ratio plastic nanostructures

2007 ◽  
Vol 84 (5-8) ◽  
pp. 1724-1728 ◽  
Author(s):  
J. Shi ◽  
C. Peroz ◽  
G. Velve Casquillas ◽  
A. Pépin ◽  
M. Belotti ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Surface Functionalization ◽  
High Aspect Ratio

Cooperative Self-Assembly of Pyridine-2,6-Diimine-Linked Macrocycles into Mechanically Robust Nanotubes

2019 ◽  
Author(s):  
Michael J. Strauss ◽  
Darya Asheghali ◽  
Austin Evans ◽  
Rebecca Li ◽  
Anton Chavez ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Synthetic Polymers ◽  
Young’S Moduli ◽  
Structural Rigidity ◽  
Assembly Mechanism ◽  
Low Dimensionality ◽  
Harsh Conditions

<p>Nanotubes assembled from macrocyclic precursors offer a unique combination of low dimensionality, structural rigidity, and distinct interior and exterior microenvironments. Usually the weak stacking energies of macrocycles limit the length or strength of the resultant nanotubes. Imine-linked macrocycles were recently found to assemble into high-aspect ratio (>10<sup>3</sup>), lyotropic nanotubes in the presence of excess acid. Yet these harsh conditions are incompatible with many functional groups and processing methods, and lower acid loadings instead catalyze macrocycle degradation. Here we report pyridine-2,6-diimine-linked macrocycles that assemble into high-aspect ratio nanotubes in the presence of less than 1 equiv of CF<sub>3</sub>CO<sub>2</sub>H per macrocycle. Analysis by gel permeation chromatography and fluorescence spectroscopy revealed a cooperative self-assembly mechanism. Nanofibers obtained by touch-spinning the pyridinium-based nanotubes exhibit Young’s moduli of 1.48 GPa, which exceeds that of many synthetic polymers and biological filaments. These findings will enable the design of structurally diverse nanotubes from synthetically accessible macrocycles. </p>

Formation of High-Aspect-Ratio Helical Nanorods via Chiral Self-Assembly of Fullerodendrimers

2014 ◽  
Vol 5 (5) ◽  
pp. 929-934 ◽  
Author(s):  
Andrew J. Hilmer ◽  
Darin O. Bellisario ◽  
Steven Shimizu ◽  
Thomas P. McNicholas ◽  
Qing Hua Wang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly

scholarly journals Scalable Production of Monodisperse Functional Microspheres by Multilayer Parallelization of High Aspect Ratio Microfluidic Channels

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 592 ◽  
Author(s):  
Casper Ho Yin Chung ◽  
Binbin Cui ◽  
Ruyuan Song ◽  
Xin Liu ◽  
Xiaonan Xu ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Large Scale ◽  
Scale Up ◽  
Functional Materials ◽  
Droplet Microfluidics ◽  
Microfluidic Channels ◽  
Layer By Layer ◽  
Precise Control ◽  
Wide Range

Droplet microfluidics enables the generation of highly uniform emulsions with excellent stability, precise control over droplet volume, and morphology, which offer superior platforms over conventional technologies for material synthesis and biological assays. However, it remains a challenge to scale up the production of the microfluidic devices due to their complicated geometry and long-term reliability. In this study, we present a high-throughput droplet generator by parallelization of high aspect ratio rectangular structures, which enables facile and scalable generation of uniform droplets without the need to precisely control external flow conditions. A multilayer device is formed by stacking layer-by-layer of the polydimethylsiloxane (PDMS) replica patterned with parallelized generators. By feeding the sample fluid into the device immersed in the carrying fluid, we used the multilayer device with 1200 parallelized generators to generate monodisperse droplets (~45 μm in diameter with a coefficient of variation <3%) at a frequency of 25 kHz. We demonstrate this approach is versatile for a wide range of materials by synthesis of polyacrylamide hydrogel and Poly (l-lactide-co-glycolide) (PLGA) through water-in-oil (W/O) and oil-in-water (O/W) emulsion templates, respectively. The combined scalability and robustness of such droplet emulsion technology is promising for production of monodisperse functional materials for large-scale applications.

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