scholarly journals Development and Morphological Characterization of Novel Polyimide/Metal nano Hybrid Materials

2019 ◽  
Vol 57 (2) ◽  
pp. 94-103
Author(s):  
Iuliana Stoica ◽  
Ion Sava ◽  
Georgiana Bulai ◽  
George Stoian ◽  
Mitachi Strat ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Hybrid Materials ◽  
Surface Characteristics ◽  
Morphological Characterization ◽  
Aromatic Diamine ◽  
Force Microscopy ◽  
Atomic Force ◽  
Thermal Imidization ◽  
Potential Applications

Two different polyimide structures were synthesized by two-step polycondensation reaction in solution, in the first step using equimolar amounts of one of two aromatic diamine (DDM or MMDA) and one dianhydride (6HDA) in N,N-dimethylacetamide (DMAc) to obtain the poly(amic acids), followed in the second step by thermal imidization. In order to obtain novel polyimide/metal nano hybrid materials, conductive Ni/Cu nanoparticles were embedded on polyimide substrates, using laser ablation technique. The morphology of the resulted thin metal layers was investigated using atomic force microscopy (AFM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The results highlighted different surface characteristics of the auto-organized metallic/polymer nanoparticles, depending on the chemical structure of the polyimide substrate, the parameters of the laser ablation setup, the deposition time, the type of the metallic target. The obtained features of these polyimide/metal nano hybrid materials can be employed as an indicator of the possibility of using them for potential applications as conductive circuits or substrates for adhesion control.

Preparation and Characterization of Chitosan-Casein Phosphopeptides Biocomposite Coatings on the Medical Titanium Alloy

2011 ◽  
Vol 480-481 ◽  
pp. 1065-1069
Author(s):  
Bin Liu ◽  
Lin Wang ◽  
Yin Zhong Bu ◽  
Sheng Rong Yang ◽  
Jin Qing Wang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Attenuated Total Reflectance ◽  
Ti Alloy ◽  
Force Microscopy ◽  
Implant Materials ◽  
Atomic Force ◽  
Casein Phosphopeptides ◽  
Potential Applications ◽  
First Time

Titanium (Ti) and its alloys have been applied in orthopedics as one of the most popular biomedical metallic implant materials. In this work, to enhance the bioactivity, the surface of Ti alloy pre-modified by silane coupling agent and glutaraldehyde was covalently grafted with chitosan (CS) via biochemical multistep self-assembled method. Then, for the first time, the achieved surface was further immobilized with casein phosphopeptides (CPP), which are one group of bioactive peptides released from caseins in the digestive tract and can facilitate the calcium adsorption and usage, to form CS-CPP biocomposite coatings. The structure and composition of the fabricated coatings were characterized by X-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and atomic force microscopy (AFM). As the experimental results indicated, multi-step assembly was successfully performed, and the CS and CPP were assembled onto the Ti alloy surface orderly. It is anticipated that the Ti alloys modified by CS-CPP biocomposite coatings will find potential applications as implant materials in biomedical fields.

Structural and Morphological Characterization of Ultrathin Films of an Asymmetric Polydiacetylene

1996 ◽  
Vol 440 ◽  
Author(s):  
H. C. Wang ◽  
D. W. Cheong ◽  
J. Kumar ◽  
C. Sung ◽  
S. K. Tripathy
Keyword(s):  
Second Harmonic ◽  
Morphological Characterization ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Glass Substrates ◽  
Atomic Force ◽  
Transmission Electron ◽  
Air Water Interface

AbstractA soluble, asymmetrically substituted polydiacetylene, poly(BPOD), has been reported to form stable monolayers at the air-water interface by the Langmuir-Blodgett (LB) technique [2]. Preformed polydiacetylene has been deposited onto hydrophobic substrates as multilayers to form second order nonlinear optical thin films. Second harmonic generation was found to increase with the number of layers. From previous atomic force microscopy (AFM) studies backbone orientation along the dipping direction with an interchain spacing of about 5 A° was indicated [2].The film morphology and preferential molecular orientation of these LB films are further investigated by transmission electron microscopy (TEM). A specifically tailored sample preparation method for the ultrathin LB films was used. Multilayer films were deposited on hydrophobic collodion covered glass substrates for this purpose. Electron diffraction was employed to study the crystalline organization of mono and multilayers of LB films as well as cast films.

Kinetic Studies on Gold Nanoparticle Formation in Aqueous Medium

2014 ◽  
Vol 625 ◽  
pp. 263-266
Author(s):  
Anirban Chakraborty ◽  
Muhammad Moniruzzaman ◽  
Sujan Chowdhury ◽  
Sekhar Bhattacharjee
Keyword(s):  
Reaction Medium ◽  
Kinetic Studies ◽  
Order Rate Constant ◽  
Morphological Characterization ◽  
Estimation Methods ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Citrate Reduction

Extensive research data were published in the last decade on synthesis, characterization and application of AuNP for drug delivery and protein conjugation. Gold nanoparticles were synthesized by the well-known citrate reduction (Turkevitch) method. Precursor concentrations were measured by UV-Vis spectroscopy and iodometric estimation methods. During reaction surface plasmon resonance (SPR) peaks of the reaction medium decreased from 556.5 nm to 527.2 nm in about 300s. Experimental data on time-concentration profiles of the precursor in the reaction medium were used to calculate pseudo-first order rate constant (0.0178± 0.002 s-1). Atomic Force Microscopy (AFM) was used for morphological characterization of the nanoparticles.

Rubber–rubber blends: A critical review

2019 ◽  
Vol 36 (3) ◽  
pp. 196-242
Author(s):  
Abitha Vayyaprontavida Kaliyathan ◽  
KM Varghese ◽  
A Sreekumaran Nair ◽  
Sabu Thomas
Keyword(s):  
Scientific Literature ◽  
Significant Proportion ◽  
Morphological Characterization ◽  
Factors Affecting ◽  
Rubber Blends ◽  
Force Microscopy ◽  
Rubber Blend ◽  
Advantages And Disadvantages ◽  
Atomic Force

The blending of different rubbers is one of the effective methods to achieve required performance properties in their final products. This article reviews the thermodynamic considerations of rubber–rubber blends and their filled systems. Factors affecting the rubber blend morphology (i.e. distribution mechanism of fillers, curatives and other compounding ingredients) and preparation techniques for rubber–rubber blends emphasizing their advantages and disadvantages are well discussed in this review. Microscopy is the field of interest to all material scientists. In the case of rubber blends, microscopy is an essential tool in order to understand the morphology, that is, size, shape and distribution of phases and filler particles in the rubber–rubber blend. In this review, selected scientific reports based on optical microscopy, electron microscopy and atomic force microscopy in rubber–rubber blends are discussed. Rubber material is a complex macromolecule; it has significant proportion of fillers, processing aids and curing agents; therefore, only a very few studies have been reported on the microscopic aspects of filled rubber–rubber blends. In particular, influence of rubber blend composition, fillers (micro and nano length scales) and processing additives on the morphology of rubber blends systems has not been systematically reviewed and discussed in the scientific literature. Therefore, in the present scenario, this review was thought of, which deals with the essential background to rubber–rubber blends, miscibility and morphological characterization of various rubber blend systems by microscopy. It is very important to add that although there is scattered information on these aspects in the scientific literature, to date a comprehensive review has not been published. The pros, cons, artefacts and the new challenges on the use of microscopy for the characterization of rubber–rubber blends are also discussed here.

scholarly journals Injectable nanosilica–chitosan microparticles for bone regeneration applications

2017 ◽  
Vol 32 (6) ◽  
pp. 813-825 ◽  
Author(s):  
Bipin Gaihre ◽  
Beata Lecka-Czernik ◽  
Ambalangodage C Jayasuriya
Keyword(s):  
Alkaline Phosphatase ◽  
Bone Regeneration ◽  
Spherical Shape ◽  
Morphological Characterization ◽  
Force Microscopy ◽  
Injectable Scaffolds ◽  
Atomic Force ◽  
Silica Nanopowder ◽  
Scanning Electron

This study was aimed at assessing the effects of silica nanopowder incorporation into chitosan-tripolyphosphate microparticles with the ultimate goal of improving their osteogenic properties. The microparticles were prepared by simple coacervation technique and silica nanopowder was added at 0% (C), 2.5% (S1), 5% (S2) and 10% (S3) (w/w) to chitosan. We observed that this simple incorporation of silica nanopowder improved the growth and proliferation of osteoblasts along the surface of the microparticles. In addition, the composite microparticles also showed the increased expression of alkaline phosphatase and osteoblast specific genes. We observed a significant increase ( p < 0.05) in the expression of alkaline phosphatase by the cells growing on all sample groups compared to the control (C) groups at day 14. The morphological characterization of these microparticles through scanning electron microscopy showed that these microparticles were well suited to be used as the injectable scaffolds with perfectly spherical shape and size. The incorporation of silica nanopowder altered the nano-roughness of the microparticles as observed through atomic force microscopy scans with roughness values going down from C to S3. The results in this study, taken together, show the potential of chitosan-tripolyphosphate-silica nanopowder microparticles for improved bone regeneration applications.

Monitoring TiO2 Nanotubes Elaboration Condition, a Way for Obtaining Various Characteristics of Nanostructures

2009 ◽  
Vol 415 ◽  
pp. 9-12 ◽  
Author(s):  
Diana Portan ◽  
D. Ionita ◽  
Ioana Demetrescu
Keyword(s):  
Atomic Force Microscopy ◽  
Tio2 Nanotubes ◽  
Surface Characteristics ◽  
Electrolyte Composition ◽  
Surface Features ◽  
Force Microscopy ◽  
Atomic Force ◽  
Elaboration Condition

In this paper the elaboration and characterization of TiO2 nanotubes as a function of anodizing conditions are studied taking into consideration electrolyte composition and voltage. The obtained results show that the nanotubes dimensions and surface features depend on elaboration conditions. The technique of surface characteristics investigation (2D and 3 D images) was atomic force microscopy which permitted roughness and porosity evaluation.

Atomic force microscopy (AFM) and 3D confocal microscopy as alternative techniques for the morphological characterization of anodic TiO 2 nanoporous layers

2016 ◽  
Vol 165 ◽  
pp. 67-70 ◽  
Author(s):  
Diego P. Oyarzún ◽  
Omar E. Linarez Pérez ◽  
Manuel López Teijelo ◽  
César Zúñiga ◽  
Eduardo Jeraldo ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Confocal Microscopy ◽  
Morphological Characterization ◽  
Force Microscopy ◽  
Atomic Force ◽  
Alternative Techniques
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