Nanoscale Fiber Deposition via Surface Charge Migration at Air-to-Polymer Liquid Interface in Near-Field Electrospinning

2020 ◽  
Vol 2 (7) ◽  
pp. 2761-2768
Author(s):  
Sun Choi ◽  
Dongwoon Shin ◽  
Jiyoung Chang
Keyword(s):  
Surface Charge ◽  
Near Field ◽  
Liquid Interface ◽  
Charge Migration ◽  
Polymer Liquid ◽  
Fiber Deposition

scholarly journals Improving SERS Detection of Bacillus thuringiensis Using Silver Nanoparticles Reduced with Hydroxylamine and with Citrate Capped Borohydride

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Hilsamar Félix-Rivera ◽  
Roxannie González ◽  
Gabriela Del Mar Rodríguez ◽  
Oliva M. Primera-Pedrozo ◽  
Carlos Ríos-Velázquez ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Surface Charge ◽  
Near Field ◽  
Medical Diagnostics ◽  
Biological Warfare Agents ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Warfare Agents ◽  
Enhanced Raman Scattering

The development of techniques that could be useful in fields other than biological warfare agents countermeasures such as medical diagnostics, industrial microbiology, and environmental applications have become a very important subject of research. Raman spectroscopy can be used in near field or at long distances from the sample to obtain fingerprinting information of chemical composition of microorganisms. In this research, biochemical components of the cell wall and endospores of Bacillus thuringiensis (Bt) were identified by surface-enhanced Raman scattering (SERS) spectroscopy using silver (Ag) nanoparticles (NPs) reduced by hydroxylamine and borohydride capped with sodium citrate. Activation of “hot spots”, aggregation and surface charge modification of the NPs, was studied and optimized to obtain signal enhancements from Bt by SERS. Slight aggregation of the NPs as well as surface charge modification to a more acidic ambient was induced using small-size borohydride-reduced NPs in the form of metallic suspensions aimed at increasing the Ag NP-Bt interactions. Hydroxylamine-reduced NPs required slight aggregation and no pH modifications in order to obtain high spectral quality results in bringing out SERS signatures of Bt.

Direct deposition of two nanomaterials with the same surface charge using a liquid–liquid interface

Nanoscale ◽  
2012 ◽  
Vol 4 (13) ◽  
pp. 3857 ◽  
Author(s):  
Jun Matsui ◽  
Toshiaki Shibata ◽  
Takahiro Yokoyama ◽  
Akito Masuhara ◽  
Hitoshi Kasai ◽  
...  
Keyword(s):  
Surface Charge ◽  
Liquid Interface ◽  
Direct Deposition

Monitoring surface charge migration in the spectral dynamics of singleCdSe∕CdSnanodot/nanorod heterostructures

2005 ◽  
Vol 72 (20) ◽  
Author(s):  
J. Müller ◽  
J. M. Lupton ◽  
A. L. Rogach ◽  
J. Feldmann ◽  
D. V. Talapin ◽  
...  
Keyword(s):  
Surface Charge ◽  
Charge Migration ◽  
Spectral Dynamics

scholarly journals Near-field mapping of three-dimensional surface charge poles for hybridized plasmon modes

AIP Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 107221 ◽  
Author(s):  
Yu Huang ◽  
Emilie Ringe ◽  
Mengjing Hou ◽  
Lingwei Ma ◽  
Zhengjun Zhang
Keyword(s):  
Surface Charge ◽  
Near Field ◽  
Three Dimensional ◽  
Field Mapping ◽  
Plasmon Modes ◽  
Dimensional Surface

Formation of Nanodents by Deposition of Nanodroplets at the Polymer−Liquid Interface

Langmuir ◽  
2010 ◽  
Vol 26 (7) ◽  
pp. 4776-4781 ◽  
Author(s):  
Xuehua Zhang ◽  
Xiaoxuan Wei ◽  
William Ducker
Keyword(s):  
Liquid Interface ◽  
Polymer Liquid

A Quantification of Jet Speed and Nanofiber Deposition Rate in Near-Field Electrospinning Through Novel Image Processing

2018 ◽  
Vol 6 (3) ◽  
Author(s):  
Jonghyun Kim ◽  
Dongwoon Shin ◽  
Kyu-Bum Han ◽  
Jiyoung Chang
Keyword(s):  
Deposition Rate ◽  
Energy Harvester ◽  
Near Field ◽  
Process Conditions ◽  
Far Field ◽  
Analysis Process ◽  
Speed Measurement ◽  
Artificial Tissue ◽  
Fiber Deposition ◽  
First Time

Electrospinning, one of the most effective ways of producing nanofibers, has been applied in as many fields throughout its long history. Starting with far-field electrospinning (FFES) and advancing to the near-field, the application area has continued to expand, but lack of understanding of the exact jet speed and fiber deposition rate is a major obstacle to entry into precision micro- to nano-scale manufacturing. In this paper, we, for the first time, analyze and predict the jet velocity and deposition rate in near-field electrospinning (NFES) through novel image analysis process. Especially, analog image is converted into a digital image, and then, the area occupied by the deposited fiber is converted into a velocity, through which the accuracy of the proposed method is proved to be comparable to direct jet speed measurement. Finally, we verified the proposed method can be applied to various process conditions without performing delicate experiments. This research not only will broaden the understanding of jet speed and fiber deposition rate in NFES but also will be applicable to various areas including patterning of the sensor, a uniform arrangement of nanofibers, energy harvester, reinforcing of composite, and reproducing of artificial tissue.

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