Laser Emission in PMMA Nano-Composite Films

2007 ◽  
Vol 121-123 ◽  
pp. 1233-1236
Author(s):  
Xiao Hong Sun ◽  
Xiao Ming Tao ◽  
Pu Xue ◽  
Jian Guo Deng ◽  
Kwan Kai Cheong
Keyword(s):  
Scanning Probe Microscopy ◽  
Laser Emission ◽  
Composite Films ◽  
Film Structure ◽  
Nano Particles ◽  
Scanning Probe ◽  
Pmma Film ◽  
Random Laser ◽  
Nano Composite ◽  
Low Threshold

In this article, low-threshold random laser with one mirror and feedback is investigated in PMMA film containing Rhodamine 590 and TiO2 nano-particles. Incoherent and coherent laser emission is observed. Optics microscopy and Scanning Probe Microscopy are used to investigate the film structure and the principle of incoherent and coherent laser is analyzed.

Low-Threshold Random Laser with One Mirror and Feedbacks in PMMA Nano-Composite Films

2005 ◽  
Vol 22 (10) ◽  
pp. 2568-2570 ◽  
Author(s):  
Sun Xiao-Hong ◽  
Tao Xiao-Ming ◽  
Xue Pu ◽  
Kwan Kai-Cheong ◽  
Deng Jian-Guo
Keyword(s):  
Composite Films ◽  
Random Laser ◽  
Nano Composite ◽  
Low Threshold

Recognition, Specificity, Scanning Probe Microscopy and Biomaterials

2001 ◽  
Vol 7 (S2) ◽  
pp. 130-131
Author(s):  
Buddy D. Ratner ◽  
Reto Luginbühll ◽  
Rene Overney ◽  
Michael Garrison ◽  
Thomas Boland
Keyword(s):  
Scanning Probe Microscopy ◽  
Secondary Ion Mass Spectrometry ◽  
Film Structure ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Specific Information ◽  
Tunneling Microscopy ◽  
Probe Microscopy ◽  
Biomaterial Surfaces ◽  
Nucleotide Bases

Although scanning probe microscopy (SPM) can generate images of surface topography, this class of techniques is exceptionally valuable in its ability to provide quantitative and chemically specific information about biomaterial surfaces with high spatial definition. Since engineered biomaterials are designed to deliver chemically defined information, often arrayed in specific geometries, tools that can characterize such materials are needed.A few years ago, we demonstrated how the atomic force microscope (AFM) could precisely distinguish between each of the four nucleotide bases that comprise DNA, measure the nucleotide-nucleotide force of interaction and spatially localize that information on a surface (1). in particular, we found that the nucleotide bases could self-assemble on gold. The assembly process was imaged using scanning tunneling microscopy (STM) and this led to an understanding of the structure of the assembled film. The assembled film structure was further characterized using electron spectroscopy for chemical analysis (ESCA) and secondary ion mass spectrometry (SIMS).

Fabrication, Characterization and Adsorptive of Human Fibrinogen of HA/PHBV Nano Composite Films

2010 ◽  
Vol 160-162 ◽  
pp. 1325-1330
Author(s):  
Jun Yuan ◽  
Qi Xin Zheng ◽  
Jian Cheng
Keyword(s):  
Mechanical Properties ◽  
Composite Films ◽  
Nano Particles ◽  
Solvent Casting ◽  
Casting Method ◽  
Human Fibrinogen ◽  
Nano Composite ◽  
Nano Scale

In this investigation, nano-scale hydroxyapatite (HA) particles were incorporated in poly(hydroxybutyrate-co-valerate) (PHBV) polymer to fabricate composite films using solvent casting method. The morphologies, mechanical properties and adsorptive of human fibrinogen of the composite films were investigated. The HA nano-particles were dispersed in the films and well bonded to the polymer. The strength of films could be enhanced and its adsorptive of human fibrinogen could be also improved greatly by introducing HA nano-particles into the films. The results suggested these newly developed nano-HA/PHBV composite films might serve as an effective biomedicine material.

scholarly journals Synthesis of Nano-Pomegranate Peel via Sol-Gel Method and Screen Characterization

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Awatif I. Muhammed ◽  
Quraish A. Kazem ◽  
Rana A. Kamal ◽  
Ahmed J. Issa ◽  
Inas F. Abed ◽  
...  
Keyword(s):  
Scanning Probe Microscopy ◽  
Sol Gel ◽  
Nano Particles ◽  
Scanning Probe ◽  
Cumulative Distribution ◽  
Pomegranate Peel ◽  
E Coli ◽  
Gram Positive Bacteria ◽  
Average Grain Size ◽  
Measurement Area

Nano peel solution was prepared using Sol-gel technology at a temperature of (80) Celsius. A number of tests were performed to describe the properties and structure of Nano material, including scanning probe microscopy (SPM), which showed the symmetric cumulative distribution of the solution Nanoparticles and the average grain size equal to 64.5 nm and the identical distribution of the Nanoparticles with a diameter of 37.75 nanometers, with a measurement area ranging between (1531.23-1558.19) nanometers. Nano-solution analyzed with a scanning electron microscope (SEM), Inspect type (S50), with a magnification power up to X2000, where dense flakes of Nano particles with a diameter of (50 ± 10) nanometers were observed. The antibacterial activity of Nano-solution by using gram- positive bacteria St. aurous and gram-negative E. coli show the inhibition diameter of (St. aurous) was 27 mm and 25 mm in (E. coli).

Laser Emission in PMMA Nano-Composite Films

2007 ◽  
pp. 1233-1236
Author(s):  
Xiao Hong Sun ◽  
Xiao Ming Tao ◽  
Pu Xue ◽  
Jian Guo Deng ◽  
Kwan Kai Cheong
Keyword(s):  
Laser Emission ◽  
Composite Films ◽  
Nano Composite

scholarly journals Superfluid density from magnetic penetration depth measurements in Nb–Cu 3D nano-composite films

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Chandan Gupta ◽  
Pradnya Parab ◽  
Sangita Bose
Keyword(s):  
Film Thickness ◽  
Energy Gap ◽  
Composite Films ◽  
Nano Particles ◽  
Imaginary Component ◽  
Nano Composite ◽  
Phase Fluctuations ◽  
Cu Content ◽  
Superconducting Energy Gap ◽  
Two Peaks

Abstract Superconductivity in 3D Nb–Cu nanocomposite granular films have been studied with varying thickness for two different compositions, Nb rich with 88 at% of Nb and Cu rich with 46 at% of Nb. For both compositions, the superconducting transition temperature (Tc) decreases with decreasing film thickness. For any thickness, doubling the Cu content in the films decreases the Tc by about 2 K. To explore if phase fluctuations play any role in superconductivity in these 3D films, the superfluid stiffness (JS) of the films was measured using low frequency two-coil mutual inductance (M) technique. Interestingly, the measurement of M in magnetic fields showed two peaks in the imaginary component of M for both Nb rich and Cu rich films. The two peaks were associated with the pair-breaking effect of the magnetic field on the intra and inter-granular coupling in these films consisting of random network of superconductor (S) and normal metal (N) nano-particles. Furthermore, JS was seen to decrease with decreasing film thickness and increasing Cu content. However, for all films studied JS remained higher than the superconducting energy gap (∆) indicating that phase fluctuations do not play any role in superconductivity in the film thickness and composition range investigated. Our results indicate that an interplay of quantum size effects (QSE) and superconducting proximity effect (SPE) controls the Tc with composition in these 3D nano-composite films.

Preparation of C-Ru-RuO2 Nano-Composite Films by Plasma-Enhanced CVD and their Electrode Property

2007 ◽  
Vol 350 ◽  
pp. 155-158 ◽  
Author(s):  
Masato Sakata ◽  
Teiichi Kimura ◽  
Takashi Goto
Keyword(s):  
Electrical Conductivity ◽  
Gas Flow ◽  
Volume Fraction ◽  
Composite Films ◽  
Composite Layer ◽  
Nano Particles ◽  
Composite Electrodes ◽  
Concentration Cell ◽  
Nano Composite ◽  
Oxygen Gas

C-Ru-RuO2 nano-composite films were prepared by plasma-enhanced chemical vapor deposition and their microstructure and electrode properties were investigated. Ru-C nano-composite films consisted of Ru nano-particles of 3 nm in diameter and an amorphous C matrix. With increasing oxygen gas flow rate (FRO2), the volume fraction of C decreased from 0.91 to 0 and Ru nano-particle size increased from 2.5 to 4.5 nm. At high FRO2, the film consisted on the fibrous RuO2 and Ru-C nano-composite layer. Ru-C nano-composite containing 91 vol% C showed the highest interfacial electrical conductivity below 673 K, and Ru-C/RuO2 composite containing 0 – 5 vol% C showed the highest interfacial electrical conductivity at 873 K. Electro-motive-force (EMF) values of an oxygen concentration cell constructed from a YSZ electrolyte and Ru-C or Ru-C/RuO2 composite electrodes responded to the change of oxygen gas partial pressure at more than 473 K. The response time of the concentration cell with Ru-C nano-composite electrodes at 573 K was less than 10 s, and that with Ru-C/RuO2 composite electrodes was about 300 s.

Ultra-low threshold optically pumped random laser emission behavior of highly oriented pyrolytic graphite

2014 ◽  
Vol 115 ◽  
pp. 261-264 ◽  
Author(s):  
Zhikun Zhang ◽  
Jiming Bian ◽  
Yuzhi Zhang ◽  
Junfeng Zhang ◽  
Fuwen Qin ◽  
...  
Keyword(s):  
Laser Emission ◽  
Pyrolytic Graphite ◽  
Random Laser ◽  
Highly Oriented Pyrolytic Graphite ◽  
Optically Pumped ◽  
Emission Behavior ◽  
Low Threshold

Imaging molecules adsorbed onto electrodes under potential control by scanning probe microscopy

1991 ◽  
Vol 49 ◽  
pp. 376-377 ◽  
Author(s):  
N.J. Tao ◽  
J.A. DeRose ◽  
P.I. Oden ◽  
S.M. Lindsay
Keyword(s):  
Surface Charge ◽  
Environmental Effects ◽  
Scanning Probe Microscopy ◽  
Statistical Significance ◽  
Electrochemical Methods ◽  
Surface Structures ◽  
Scanning Probe ◽  
Potential Control ◽  
Afm Imaging ◽  
Special Circumstances

Clemmer and Beebe have pointed out that surface structures on graphite substrates can be misinterpreted as biopolymer images in STM experiments. We have been using electrochemical methods to react DNA fragments onto gold electrodes for STM and AFM imaging. The adsorbates produced in this way are only homogeneous in special circumstances. Searching an inhomogeneous substrate for ‘desired’ images limits the value of the data. Here, we report on a reversible method for imaging adsorbates. The molecules can be lifted onto and off the substrate during imaging. This leaves no doubt about the validity or statistical significance of the images. Furthermore, environmental effects (such as changes in electrolyte or surface charge) can be investigated easily.

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