Effect of surface roughness on substrate-tuned gold nanoparticle gap plasmon resonances

Nanoscale ◽  
2015 ◽  
Vol 7 (9) ◽  
pp. 4250-4255 ◽  
Author(s):  
Chatdanai Lumdee ◽  
Binfeng Yun ◽  
Pieter G. Kik
Keyword(s):  
Surface Roughness ◽  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Single Particle ◽  
Gold Films ◽  
Particle Scattering ◽  
Plasmon Resonances ◽  
Scattering Spectra ◽  
The Impact ◽  
Effect Of Surface

The impact of nanoscale surface roughness on substrate-tuned gold nanoparticle plasmon resonances is demonstrated by comparing single-particle scattering spectra with simulated scattering spectra of gold nanoparticles on gold films with realistic roughness.

scholarly journals Plasmonic polymers unraveled through single particle spectroscopy

Nanoscale ◽  
2014 ◽  
Vol 6 (19) ◽  
pp. 11451-11461 ◽  
Author(s):  
Liane S. Slaughter ◽  
Lin-Yung Wang ◽  
Britain A. Willingham ◽  
Jana M. Olson ◽  
Pattanawit Swanglap ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Chain Length ◽  
Single Particle ◽  
One Dimensional ◽  
Plasmon Resonances ◽  
Single Particle Spectroscopy

Single particle spectroscopy reveals how composition, chain length, and disorder affect the collective plasmon resonances in quasi one-dimensional assemblies of gold nanoparticles.

scholarly journals Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 814
Author(s):  
Chitta Sai Sandeep ◽  
Lina Luo ◽  
Kostas Senetakis
Keyword(s):  
Surface Roughness ◽  
Grain Size ◽  
Coefficient Of Restitution ◽  
Block Type ◽  
Flow Energy ◽  
Different Types ◽  
The Impact ◽  
Impact Experiments ◽  
Two Bodies ◽  
Effect Of Surface

The coefficient of restitution (COR) represents the fraction of pre-collision kinetic energy remained after the collision between two bodies. The COR parameter plays an important role in the discrete numerical analysis of granular flows or the design of protective barriers to reduce flow energy. This work investigated the COR for grain-block type impacts through comprehensive experiments using a custom-built impact loading apparatus. Glass balls of three different sizes were used as grains. The impact experiments were performed on three different types of materials as base blocks, namely brass, granite and rubber. Experiments on the brass block showed a decrease in COR values with increasing grain size. On the contrary, impacts on granite and rubber blocks showed an increase in COR values with increasing grain size. Additionally, the effect of surface roughness on the COR was investigated. It was revealed that the increase in surface roughness of either the grain or the block reduced the COR values due to the increased plastic deformations of surface asperities.

Effect of Surface Roughness on Single Cryogen Droplet Spreading

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Jie Liu ◽  
Walfre Franco ◽  
Guillermo Aguilar
Keyword(s):  
Surface Roughness ◽  
Human Skin ◽  
Droplet Diameter ◽  
Skin Surface ◽  
Skin Layer ◽  
Droplet Spreading ◽  
Viscous Boundary Layer ◽  
Superficial Skin ◽  
The Impact ◽  
Effect Of Surface

Cryogen spray cooling is an auxiliary procedure to dermatologic laser surgery, which consists of precooling the superficial skin layer (epidermis) during laser irradiation of subsurface targets to avoid nonspecific epidermal thermal damage. While previous studies have investigated the interaction of cryogen sprays with microscopically smooth human skin models, it is important to recognize that real human skin surface is far from smooth. With the objective to provide physical insight into the interaction between cryogen sprays and human skin, we study the effect of surface roughness on the impact dynamics of single cryogen droplets falling on skin models of various roughnesses (0.5–70μm). We first develop a theoretical model to predict the maximum spread diameter (Dm) following droplet impingement based on a similarity approximation to the solution of a viscous boundary layer that incorporates friction as the major source of viscous dissipation on a rough surface. Then, we measure the droplet diameter, impact velocity, and Dm of cryogen droplets falling by gravity onto skin models. Experimental data prove that the proposed model predicts Dm with good accuracy, suggesting that the effects of surface roughness and friction on Dm are properly taken into account for the range of surface roughness studied herein.

Effect of surface chemistry and morphology of gold nanoparticle on the structure and activity of common blood proteins

2016 ◽  
Vol 40 (6) ◽  
pp. 4879-4883 ◽  
Author(s):  
Abhishek Chaudhary ◽  
Syamantak Khan ◽  
Abhishek Gupta ◽  
Chayan Kanti Nandi
Keyword(s):  
Gold Nanoparticles ◽  
Surface Chemistry ◽  
Gold Nanoparticle ◽  
Cell Cytotoxicity ◽  
Blood Proteins ◽  
Conformational Study ◽  
Structure And Activity ◽  
Anisotropic Gold Nanoparticles ◽  
Effect Of Surface

In vitro cell cytotoxicity and conformational study of serum protein with anisotropic gold nanoparticles.

The impact of the polar core size and external organic media composition on micelle–micelle interactions: the effect on gold nanoparticle synthesis

2015 ◽  
Vol 39 (11) ◽  
pp. 8887-8895 ◽  
Author(s):  
Jorge A. Gutierrez ◽  
M. Alejandra Luna ◽  
N. Mariano Correa ◽  
Juana J. Silber ◽  
R. Darío Falcone
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Reverse Micelles ◽  
Nanoparticle Synthesis ◽  
Organic Media ◽  
Core Size ◽  
Media Composition ◽  
Gold Nanoparticle Synthesis ◽  
The Impact

An easy way to modulate reverse micelles as nanoreactors to produce different kinds of gold nanoparticles.

Single particle electrochemistry of p-hydroxythiophenol-labeled gold nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49031-49035 ◽  
Author(s):  
Jing Zhang ◽  
Yongfeng Wei ◽  
Lei Tian ◽  
Xiaofeng Kang
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Single Particle ◽  
Particle Collision ◽  
Nanoparticle Surface ◽  
Electrochemical Signal

Electroactive p-hydroxythiophenol (p-HTP) monolayer on a gold nanoparticle surface produced an amplified single particle-collision electrochemical signal.

scholarly journals Effect of Surface Roughness during Peristaltic Movement in a Nonuniform Channel

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
R. Shukla ◽  
S. S. Bhatt ◽  
A. Medhavi ◽  
R. Kumar
Keyword(s):  
Surface Roughness ◽  
Newtonian Fluid ◽  
Biological Fluids ◽  
Current Model ◽  
Roughness Parameter ◽  
Pressure Rise ◽  
Complete Agreement ◽  
Major Mode ◽  
The Impact ◽  
Effect Of Surface

In this study, the effect of the roughness parameter during the peristaltic transport of a Newtonian fluid in a nonuniform channel has been explored. The motivation of this study comes from various research studies in the area of life sciences and engineering, which reveal that the wall of living beings’ arteries and all other surfaces have roughness to some extent. As peristalsis is a major mode of transporting biological fluids in various organs, the effect of surface roughness during peristaltic flow becomes very significant. The problem of peristaltic motion of a Newtonian fluid through a rough nonuniform channel having sinusoidal-shaped roughness has been investigated in the current work. To analyze the flow, analytic formulation of pressure rise, friction force, velocity, and pressure gradient has been carried out under the low Reynolds number and long-wavelength approximation. Results obtained for zero surface roughness from the current model are in complete agreement with previous studies available in the literature that have been carried out without considering the surface roughness of the wall. Numerical outcomes for the properties mentioned above have been plotted for analyzing the impact of roughness on the physical and flow parameters.

Graphene/gold nanoparticle composites for ultrasensitive and versatile biomarker assay using single-particle inductively-coupled plasma/mass spectrometry

The Analyst ◽  
2020 ◽  
Vol 145 (24) ◽  
pp. 7932-7940
Author(s):  
Yuqian Xing ◽  
Juan Han ◽  
Xu Wu ◽  
David T. Pierce ◽  
Julia Xiaojun Zhao
Keyword(s):  
Mass Spectrometry ◽  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Single Particle ◽  
Inductively Coupled Plasma ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Nanoparticle Composites

An ultrasensitive biomarker assay platform established by monitoring the gold nanoparticles (AuNPs) desorbed away from graphene triggered by the target using single-particle inductively-coupled plasma/mass spectrometry (spICP-MS).

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