Catalytic etching of {100}-oriented diamond coating with Ni and Cu nanoparticles under hydrogen

2020 ◽  
Vol 34 (08) ◽  
pp. 2050062
Author(s):  
Naiyuan Cui ◽  
Fei Wang ◽  
Lei Guo
Keyword(s):  
Laser Scanning ◽  
Hydrogen Atmosphere ◽  
Internal Environment ◽  
Cu Nanoparticles ◽  
Diamond Coating ◽  
Laser Scanning Confocal Microscope ◽  
Rna Molecules ◽  
Force Microscopy ◽  
Atomic Force ◽  
Catalytic Etching

Nanopores formed in insulating solid state membrane is of great importance in many fields such as detection of DNA/RNA molecules in their internal environment, probing and manipulating biopolymers. Here, we present an effective and convenient method to form nanopores in diamond etched by self-assembled Ni or Cu nanoparticles in hydrogen atmosphere. With our method, homogeneous nanopores with lateral size in the range of [Formula: see text]–[Formula: see text] were created without using Reactive Ion Etching (RIE) process. In this work, the etching pits of Ni and Cu etched diamond were investigated, respectively. A novel step-like pattern of etching pits was observed on diamond etched by Ni. In order to study the etching process and figure out the etching mechanism of diamond, Scanning Electron Microscopy (SEM) was used to observe the etching morphology. Atomic Force Microscopy (AFM) and Laser Scanning Confocal Microscope (LSCM) were used to visualize the image of diamond etching pits and investigate the step-like pattern. A fixed step height was observed in each pit. Based on these observations and findings, a hypothesis is proposed, which can help to provide a new controllable etching method.

Study on the Effect of Drying on Binder Z- Directional Distribution in Coated Paper

2011 ◽  
Vol 233-235 ◽  
pp. 1608-1613
Author(s):  
Ying Li ◽  
Bei Hai He
Keyword(s):  
Laser Scanning ◽  
Visual Analysis ◽  
Coating Layer ◽  
Coated Paper ◽  
Laser Scanning Confocal Microscope ◽  
Directional Distribution ◽  
Force Microscopy ◽  
Atomic Force ◽  
Base Paper ◽  
Drying Condition

The main objective of this study was to investigate the effect of drying condition on the binder distribution and characterize the binder migration in the method of numerical and visual analysis by Scanning Electrical Microscopy (SEM), Atomic Force Microscopy (AFM), and Laser Scanning Confocal Microscope (LSCM). In this study, Rhodamine B was used to stain the binder and as the probe to characterize z-directional distribution of the binder using LSCM. The results implied that it was reliable and effective method using LSCM to characterize the z- directional distribution of binder and analyze the influence of dry condition on binder migration. It could be concluded that the dry temperature played an important effect on binder distribution in coated paper and high dry temperature accelerated binder migration to the coating surface, however low drying temperature made binder migrate towards the interior of base paper. Moderate drying is good to binder distribution and coating layer forming.

Ultrasonically synthesized organic liquid-filled chitosan microcapsules: part 2: characterization using AFM (atomic force microscopy) and combined AFM–confocal laser scanning fluorescence microscopy

Soft Matter ◽  
2018 ◽  
Vol 14 (16) ◽  
pp. 3192-3201 ◽  
Author(s):  
Srinivas Mettu ◽  
Qianyu Ye ◽  
Meifang Zhou ◽  
Raymond Dagastine ◽  
Muthupandian Ashokkumar
Keyword(s):  
Atomic Force Microscopy ◽  
Fluorescence Microscopy ◽  
Young’S Modulus ◽  
Laser Scanning ◽  
Young's Modulus ◽  
Organic Liquid ◽  
Confocal Laser Scanning ◽  
Confocal Laser ◽  
Force Microscopy ◽  
Atomic Force

Atomic Force Microscopy (AFM) is used to measure the stiffness and Young's modulus of individual microcapsules that have a chitosan cross-linked shell encapsulating tetradecane.

scholarly journals Intragenic Antimicrobial Peptide Hs02 Hampers the Proliferation of Single- and Dual-Species Biofilms of P. aeruginosa and S. aureus: A Promising Agent for Mitigation of Biofilm-Associated Infections

2019 ◽  
Vol 20 (14) ◽  
pp. 3604 ◽  
Author(s):  
Lucinda J. Bessa ◽  
Julia R. Manickchand ◽  
Peter Eaton ◽  
José Roberto S. A. Leite ◽  
Guilherme D. Brand ◽  
...  
Keyword(s):  
Antimicrobial Peptide ◽  
Laser Scanning ◽  
Multidrug Resistant ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Antibiofilm Activity ◽  
Bacterial Cells ◽  
Generalized Polarization ◽  
Force Microscopy ◽  
Atomic Force

Pseudomonas aeruginosa and Staphylococcus aureus are two major pathogens involved in a large variety of infections. Their co-occurrence in the same site of infection has been frequently reported and is linked to enhanced virulence and difficulty of treatment. Herein, the antimicrobial and antibiofilm activities of an intragenic antimicrobial peptide (IAP), named Hs02, which was uncovered from the human unconventional myosin 1H protein, were investigated against several P. aeruginosa and S. aureus strains, including multidrug-resistant (MDR) isolates. The antibiofilm activity was evaluated on single- and dual-species biofilms of P. aeruginosa and S. aureus. Moreover, the effect of peptide Hs02 on the membrane fluidity of the strains was assessed through Laurdan generalized polarization (GP). Minimum inhibitory concentration (MIC) values of peptide Hs02 ranged from 2 to 16 μg/mL against all strains and MDR isolates. Though Hs02 was not able to hamper biofilm formation by some strains at sub-MIC values, it clearly affected 24 h preformed biofilms, especially by reducing the viability of the bacterial cells within the single- and dual-species biofilms, as shown by confocal laser scanning microscopy (CLSM) and atomic force microscopy (AFM) images. Laurdan GP values showed that Hs02 induces membrane rigidification in both P. aeruginosa and S. aureus. Peptide Hs02 can potentially be a lead for further improvement as an antibiofilm agent.

Surface morphology of as grown and annealed bulk GaN crystals

1996 ◽  
Vol 1 ◽  
Author(s):  
G. Nowak ◽  
S. Krukowski ◽  
I. Grzegory ◽  
S. Porowski ◽  
Jacek M. Baranowski ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Flat Surface ◽  
Hydrogen Atmosphere ◽  
The Other ◽  
Crystal Surfaces ◽  
Force Microscopy ◽  
Atomic Force ◽  
Flat Side ◽  
Bulk Gan ◽  
Atomically Flat

GaN single crystals have been grown from Ga solution. The crystals grow in the form of platelets with their basal plane perpendicular to the c-axis. The two opposite crystal surfaces are not equivalent since one is N- and the other Ga-terminated. Atomic force microscopy has been applied to study surface morphology on both surfaces. It was found that one side is atomically flat. The other side consists of pyramid-like structures about 25 nm in size.The influence of annealing in an NH3+H2 atmosphere in the temperature range from 600°C to 900°C was investigated. Depending on crystal face the results were drastically different. It was found that on the rough side, annealing yields an atomically flat surface with terraces of monolayer height. The size of the terraces depends on the temperature of the annealing. On the originally flat side the surface becomes rougher after annealing. The transformation of surface morphology begins at temperatures below 700°C. Preliminary results of annealing in a hydrogen atmosphere are also reported. These findings are crucial for the understanding and development of GaN homoepitaxy.

Investigation on Post Treatment of Nano-Size Silver Conductive Film

2011 ◽  
Vol 675-677 ◽  
pp. 1117-1120
Author(s):  
Wen Zhao ◽  
Lu Hai Li ◽  
Zhi Qing Xin ◽  
Luo Bu Danzeng
Keyword(s):  
Laser Scanning ◽  
Conductive Ink ◽  
Force Microscopy ◽  
Printed Circuit ◽  
Silver Ink ◽  
Atomic Force ◽  
Conductive Film ◽  
Efficient Alternative ◽  
Nano Size ◽  
Dipping Time

To achieve a satisfied conductivity of nano-size silver printed circuit, post deal with nano-size silver conductive film was investigated. Based on the preparation of nano-size conductive ink and conductive circuit, the coated conductive film was treated by series concentrations of hydrochloride solutions, and then scanned by laser beam. The influence of resolutions concentration and dipping time were investigated separately. Atomic force microscopy (AFM), fourier transform infrared (FTIR) and four-probe tester, were applied to characterize the different tested samples. It was found that when the coated silver conductive ink samples were dipped in 20% hydrochloride for 60min, 15°C before laser scanning, the conductivity reaches 0.3Ω/□. It is therefore considered that the “dip in” method provide an efficient alternative to improve the conductivity which from nano-size silver ink.

scholarly journals An Approach to Visualize the Deformation of the Intermediate Filament Cytoskeleton in Response to Locally Applied Forces

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Jiashan Wang ◽  
Andrew E. Pelling
Keyword(s):  
Intermediate Filament ◽  
Laser Scanning ◽  
Longitudinal Axis ◽  
Fibroblast Cells ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmitted Force ◽  
Entire Cell ◽  
Applied Forces ◽  
Short Times

The intermediate filament (IF) cytoskeleton plays an important role in integrating biomechanical pathways associated with the actin and microtubule cytoskeleton. Vimentin is a type III IF protein commonly found in fibroblast cells and plays a role in transmitting forces through the cytoskeleton. Employing simultaneous laser scanning confocal and atomic force microscopy (AFM), we developed a methodology to quantify the deformation of the GFP-vimentin-labeled IF cytoskeleton as a function of time in response to force application by the AFM. Over short times (seconds), IFs deformed rapidly and transmitted force throughout the entire cell in a highly complex and anisotropic fashion. After several minutes, mechanically induced displacements of IFs resemble basal movements. In well-adhered cells the deformation of IFs is highly anisotropic as they tend to deform away from the longitudinal axis of the cell. This study demonstrates that simultaneous AFM and LSCM can be employed to track the deformation and dissipation of force through the IF cytoskeleton.

scholarly journals Actin microridges characterized by laser scanning confocal and atomic force microscopy

FEBS Letters ◽  
2005 ◽  
Vol 579 (9) ◽  
pp. 2001-2008 ◽  
Author(s):  
Amita Sharma ◽  
Kurt I. Anderson ◽  
Daniel J. Müller
Keyword(s):  
Atomic Force Microscopy ◽  
Laser Scanning ◽  
Force Microscopy ◽  
Atomic Force
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