Three-dimensional hotspots in evaporating nanoparticle sols for ultrahigh Raman scattering: solid–liquid interface effects

Nanoscale ◽  
2015 ◽  
Vol 7 (15) ◽  
pp. 6619-6626 ◽  
Author(s):  
Yudie Sun ◽  
Zhenzhen Han ◽  
Honglin Liu ◽  
Shengnan He ◽  
Liangbao Yang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Capillary Force ◽  
Three Dimensional ◽  
Liquid Interface ◽  
Sers Enhancement ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Interface Effects

Decreasing interface adsorbing and increasing capillary-force packing of nanoparticles in an evaporating Ag-sol droplet is responsible for much higher SERS enhancement.

Experimental and Numerical Analysis of Droplet Cooling

2010 ◽  
Author(s):  
Paolo Tartarini ◽  
Mauro A. Corticelli ◽  
Paolo E. Santangelo
Keyword(s):  
Three Dimensional ◽  
Numerical Approach ◽  
Solid Substrate ◽  
Liquid Interface ◽  
Temperature Trend ◽  
Numerical Code ◽  
Uniform Mesh ◽  
Thermal Transient ◽  
Solid Liquid Interface ◽  
Solid Liquid

Dropwise cooling represents a major subject of interest for both academic and industrial researches. The present work is focused on investigating the thermal transient occurring as two water droplets are gently released (We < 30) onto a heated solid surface. This latter has been kept at initial temperature lower than 373.15 K to analyze the single-phase-evaporation regime. To the purpose, both an experimental and a numerical approach have conveniently been employed. Infrared thermography has been used to evaluate the temperature trend at the solid-liquid interface: an experimental facility has been built to carry out measurements from below, thus realizing a fully non-intrusive approach. A transparent-crystal disk has been inserted to serve as the solid substrate; its upper surface has been painted by a black coating, thus providing a black-body surface as the solid-liquid interface. The infrared thermocamera has been placed below and perpendicular to that surface; temperature has been thereby measured, being emissivity a known parameter. A numerical code has been developed to predict the involved physical phenomena: temperature trend, evaporation time and evaporated flux result from discretizing the three-dimensional energy-diffusion equation by the finite-volume method. Moreover, the model is based on structured non-uniform mesh to adapt to the occurring temperature gradients. Very good agreement is shown between experimental and numerical outcomes in terms of thermal transient and recovery.

scholarly journals Electron microscopy of nanoparticle superlattice formation at a solid-liquid interface in nonpolar liquids

2020 ◽  
Vol 6 (20) ◽  
pp. eaba1404
Author(s):  
E. Cepeda-Perez ◽  
D. Doblas ◽  
T. Kraus ◽  
N. de Jonge
Keyword(s):  
Electron Microscopy ◽  
Three Dimensional ◽  
Honeycomb Structure ◽  
Liquid Interface ◽  
Thin Layers ◽  
Fine Tuning ◽  
Particle Layer ◽  
Dense Packings ◽  
Solid Liquid Interface ◽  
Solid Liquid

Nanoparticle superlattice films form at the solid-liquid interface and are important for mesoscale materials, but are notoriously difficult to analyze before they are fully dried. Here, the early stages of nanoparticle assembly were studied at solid-liquid interfaces using liquid-phase electron microscopy. Oleylamine-stabilized gold nanoparticles spontaneously formed thin layers on a silicon nitride (SiN) membrane window of the liquid enclosure. Dense packings of hexagonal symmetry were obtained for the first monolayer independent of the nonpolar solvent type. The second layer, however, exhibited geometries ranging from dense packing in a hexagonal honeycomb structure to quasi-crystalline particle arrangements depending on the dielectric constant of the liquid. The complex structures formed by the weaker interactions in the second particle layer were preserved, while the surface remained immersed in liquid. Fine-tuning the properties of the involved materials can thus be used to control the three-dimensional geometry of a superlattice including quasi-crystals.

scholarly journals Three-dimensional morphology of bacterial community developed on the index-matched materials

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chigusa Okano ◽  
Kyosuke Takabe ◽  
Tomohiro Hirayama ◽  
Nobuhiko Nomura ◽  
Yutaka Yawata
Keyword(s):  
Structural Model ◽  
Three Dimensional ◽  
Liquid Interface ◽  
Low Contrast ◽  
Promising Tool ◽  
Index Matching ◽  
Transformation Methods ◽  
Solid Liquid Interface ◽  
Biofilm Structure ◽  
Solid Liquid

AbstractHerein, we demonstrate that the use of index-matching materials (IMMs) allows direct visualization of microbial cells maintained at a solid–liquid interface through confocal reflection microscopy (CRM). The refractive index mismatch induces a background reflection at the solid–liquid interface that dwarfs the reflection signals from the cells and results in low-contrast images. We found that the IMMs sufficiently suppressed the background reflection at the solid–liquid interface, facilitating the imaging of microbes at the solid surface using CRM. The use of IMMs allowed quantitative analysis of the morphology of the mesh-like structure of Pseudomonas aeruginosa biofilms formed under denitrifying conditions, which led us to propose a novel structural model of the highly porous biofilm structure. These results indicate that the use of CRM coupled with an IMM offers a unique and promising tool for probing the dynamics of biofilm formation, along with visualization of environmental organisms and newly isolated bacteria, for which transformation methods are difficult to establish.

scholarly journals Mechanism of atomic force microscopy imaging of three-dimensional hydration structures at a solid-liquid interface

2015 ◽  
Vol 92 (15) ◽  
Author(s):  
Takeshi Fukuma ◽  
Bernhard Reischl ◽  
Naritaka Kobayashi ◽  
Peter Spijker ◽  
Fillippo Federici Canova ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Three Dimensional ◽  
Liquid Interface ◽  
Microscopy Imaging ◽  
Force Microscopy ◽  
Atomic Force ◽  
Atomic Force Microscopy Imaging ◽  
Solid Liquid Interface ◽  
Solid Liquid
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