In Situ Visualization of Self-Assembly of Charged Gold Nanoparticles

2013 ◽  
Vol 135 (10) ◽  
pp. 3764-3767 ◽  
Author(s):  
Yuzi Liu ◽  
Xiao-Min Lin ◽  
Yugang Sun ◽  
Tijana Rajh
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
In Situ Visualization

scholarly journals In Situ Self-Assembly of Ultrastable Gold Nanoparticles on Polyvinyl Alcohol Nanofibrous Mats for Use as Highly Reusable Catalysts

ACS Omega ◽  
2019 ◽  
Vol 4 (22) ◽  
pp. 20094-20100
Author(s):  
Lin Xu ◽  
Hongping Xiang ◽  
Zhengjian Chen ◽  
Xu Zhang
Keyword(s):  
Gold Nanoparticles ◽  
Polyvinyl Alcohol ◽  
Self Assembly

In Situ Visualization of Layer Transitions during Convective Self-Assembly in a Sessile Drop

2007 ◽  
Vol 31 ◽  
pp. 117-119
Author(s):  
Li Gao ◽  
Qing Feng Yan ◽  
C.C. Wong ◽  
Yet Ming Chiang
Keyword(s):  
Self Assembly ◽  
Sessile Drop ◽  
Three Dimensional ◽  
Colloidal Crystals ◽  
Layer Transition ◽  
Simple Method ◽  
Colloidal Spheres ◽  
In Situ Visualization ◽  
Set Up

Convective self-assembly of colloidal spheres provides a simple method for fabricating two and three dimensional colloidal crystals. In this work, we investigated the layer transitions phenomena during colloidal self-assembly in a sessile drop by using an in-situ videoscopic set-up. The effects of surface charge, colloidal concentration, and surfactant additions were examined. The results show that the chemical environment plays an important role in colloidal self-assembly. In the case of ordered growth, different layer transition phenomena were observed when the colloidal concentration is different.

In-situ visualization and order quantification of symmetric diblock copolymer directed self-assembly

2013 ◽  
Vol 543 ◽  
pp. 148-152 ◽  
Author(s):  
M. Salaün ◽  
M. Le Gallic ◽  
E. Picard ◽  
M. Zelsmann
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
In Situ Visualization

In-Situ Visualization of Evaporation Induced Self-Assembly Phenomena of Nanofluids Detecting the Interfacial Surface Plasmon Reflectance

2015 ◽  
Author(s):  
Iltai (Isaac) Kim ◽  
Kenneth David Kihm
Keyword(s):  
Refractive Index ◽  
Real Time ◽  
Surface Plasmon ◽  
Self Assembly ◽  
Effective Refractive Index ◽  
In Situ Visualization ◽  
Evaporation Induced Self Assembly ◽  
Self Assembled ◽  
Mapping Techniques

Innovative optical techniques based on nano-biophotonics such as surface plasmon resonance (SPR) imaging and R-G-B natural fringe mapping techniques are developed to characterize the transport and optical properties of nanofluids in situ, real-time, and full field manner. Recent results regarding the characterization of nanofluids are summarized and future research directions are presented. 47 nm Al2O3 nanoparticles are dispersed in water with various concentrations. Al2O3 nanofluids droplets are placed on substrates and evaporated in room temperature. In-situ visualization of evaporation-induced self-assembly is conducted to detect concentration, effective refractive index, and different self-assembled pattern including cavity with various nanofluids concentrations and surface hydrophobbicities with SPR and fringe mapping. During the evaporation, time-dependent and near-field nanoparticle concentrations are determined by correlating the SPR reflectance intensities with the effective refractive index (ERI) of the nanofluids. With increasing the concentrations of nanofluids, the existence of hidden complex cavities inside a self-assembled nanocrystalline structure or final dryout pattern is discovered in real-time. R-G-B natural fringe mapping allowed the reconstruction of the 3D cavity formation and crystallization processes quantitatively. The formation of the complex inner structure was found to be attributable to multiple cavity inceptions and their competing growth during the aquatic evaporation. Furthermore, the effect of surface hydrophobicity is examined in the formation of hidden complex cavities, taking place on three different substrates bearing different levels of hydrophobicity; namely, cover glass (CG), gold thin film (Au), and polystyrene dish (PS). These surface plamson resonance imaging and natural fringe mapping techniques are expected to provide a breakthrough in micro-nanoscale thermal fluids phenomena and nano-biochemical sensing when coupled with localized surface Plasmon and metamaterials techniques.

scholarly journals In Situ Visualization of Block Copolymer Self-Assembly in Organic Media by Super-Resolution Fluorescence Microscopy

2015 ◽  
Vol 21 (51) ◽  
pp. 18539-18542 ◽  
Author(s):  
Charlotte E. Boott ◽  
Romain F. Laine ◽  
Pierre Mahou ◽  
John R. Finnegan ◽  
Erin M. Leitao ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Fluorescence Microscopy ◽  
Self Assembly ◽  
Super Resolution ◽  
Organic Media ◽  
In Situ Visualization

Monitoring pattern formation in drying and wetting dispersions of gold nanoparticles by ESEM

2015 ◽  
Vol 181 ◽  
pp. 281-298 ◽  
Author(s):  
Casper Kunstmann-Olsen ◽  
Domagoj Belić ◽  
Mathias Brust
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Early Stage ◽  
Environmental Scanning Electron Microscopy ◽  
Water Soluble ◽  
Environmental Scanning ◽  
Evaporation And Condensation ◽  
Lift Off ◽  
Poly Ethylene

We report an investigation of the self-assembly of patterns from functionalized gold nanoparticles (GNPs) by monitoring the process in situ by environmental scanning electron microscopy (ESEM) during both evaporation and condensation of the dispersant. As this method limits the choice of dispersants to water, GNPs functionalized with hydrophilic thiol ligands, containing poly(ethylene)glycol (PEG) groups, were used on a variety of substrates including pre-patterned ones. Particular emphasis was given to early stage deposition of GNPs, as well as redispersion and lift-off upon condensation of water droplets. ESEM presents a unique opportunity of directly imaging such events in situ. It was found that attractive interactions between the substrate and the GNPs are often stronger than expected once the particles have been deposited. The role of nickel perchlorate as a highly water-soluble additive was studied. It was found that entropically driven deposition of particles and decoration of surface features was enhanced in its presence, as expected.

scholarly journals In situ self-assembly of gold nanoparticles on hydrophilic and hydrophobic substrates for influenza virus-sensing platform

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Syed Rahin Ahmed ◽  
Jeonghyo Kim ◽  
Van Tan Tran ◽  
Tetsuro Suzuki ◽  
Suresh Neethirajan ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Influenza Virus ◽  
Self Assembly ◽  
Sensing Platform
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