Characterization of Renewable Composites

2001 ◽  
Vol 702 ◽  
Author(s):  
A. Emekalam ◽  
X. Gu ◽  
D. Raghavan
Keyword(s):  
Composite Films ◽  
Polymer System ◽  
Phase System ◽  
Phase Imaging ◽  
Blend Films ◽  
Selective Degradation ◽  
Degradable Polymer ◽  
Wide Range ◽  
Multi Phase

ABSTRACTIn this study, we demonstrate the usefulness of chemical based method in combination with AFM to characterize a wide range of degradable polymer blends. This approach is based on selective degradation of one of the phase in a multi-phase system and the ability of TMAFM to provide nanoscale lateral information about the different phases in the polymer system. Composite films containing different percentage of hydrolyzable polymer were either melt processed/solution casted and then exposed to a hydrolytic acidic environment and analyzed using TMAFM. Pits were observed to form in the blend films. The progressive hydrolysis of the hydrolyzable component in the composite was studied by FTIR analyses. TMAFM phase imaging was used to follow pit growth of the blend as a function of exposure time. The usefulness of the chemical modification/AFM approach in the characterization of renewable porous material membranes is discussed.

scholarly journals Flexible and High Thermal Conductivity Composites Based on Graphite Nanoplates Paper Impregnated with Polydimethylsiloxane

2021 ◽  
Vol 5 (12) ◽  
pp. 309
Author(s):  
Daniele Battegazzore ◽  
Erica Fadda ◽  
Alberto Fina
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Deposition Time ◽  
Electronic Devices ◽  
Composite Films ◽  
Thermal And Mechanical Properties ◽  
Wide Range ◽  
High Flexibility ◽  
Highly Porous

This paper deals with the design, preparation, and characterization of conductive and flexible nanopapers based on graphite nanoplates (GNP) and polydimethylsiloxane (PDMS). Highly porous GNP nanopapers were first prepared by filtration from a GNP suspension in a solvent. Subsequently, PDMS impregnation was carried out to obtain a composite material. By varying the concentration of the polymer solution and the deposition time, PDMS/GNP nanopapers were produced with a wide range of PDMS contents, porosities, and densities. Thermal diffusivity of the composite films (both in-plane and cross-plane) were measured and correlated with the structure of the nanopapers. Selected formulations were investigated in detail for their physical, thermal, and mechanical properties, exhibiting high flexibility and resistance to more than 50 repeated bendings, stiffness of up to 1.3 MPa, and thermal conductivity of up to 25 W/m∙K. Based on the properties obtained, the materials presented in this paper may find applications in modern lightweight and flexible electronic devices.

Characterization of Magnetron Assisted Pulsed Laser Deposited ZrO2-Au Composite Films Using TEM and EDS

2001 ◽  
Vol 7 (S2) ◽  
pp. 1232-1233
Author(s):  
J.J. Hu ◽  
A.A. Voevodin ◽  
J.S. Zabinski
Keyword(s):  
Composite Coatings ◽  
Composite Films ◽  
Pulsed Laser ◽  
Ion Milling ◽  
Tem Analysis ◽  
Wear Rates ◽  
Aerospace Applications ◽  
Wide Range ◽  
Good Potential

Microstructurally engineered oxide coatings have good potential as lubricants for aerospace applications over a wide range of environmental conditions1. Using composite microstructures, wear rates and friction coefficients may be reduced compared to monolithic coatings. Here, we report the characterization of ZrO2-Au composite coatings as new candidate lubricants. Au is added to ZrO2 to reduce friction and improve toughness. The composite films were grown on steel and silicon disks at room temperature (RT) by pulsed laser ablation of a ZrO2/5 wt. % Y2O3 target, with simultaneous operation of a magnetron source to add Au. The laser beam was operated at 250mJ, 40 Hz, and the magnetron was operated at 1.5-3.5 W cm-2 in 2.7 Pa argon. Varying the magnetron power produced coatings with different concentrations of Au. The coatings were prepared for transmission electron microscope (TEM) analysis by tripod polishing and ion milling on a cold stage.

Thermal and optical characterization of up-converting thermographic phosphor polymer composite films

MRS Advances ◽  
2018 ◽  
Vol 3 (60) ◽  
pp. 3489-3494 ◽  
Author(s):  
Firouzeh Sabri ◽  
Stephen W Allison ◽  
Makunda Aryal ◽  
Josh Collins ◽  
Howard Bell
Keyword(s):  
Surrounding Medium ◽  
Composite Films ◽  
Sample Type ◽  
Thermographic Phosphors ◽  
Thermographic Phosphor ◽  
Maximum Utility ◽  
Wide Range ◽  
Infrared Excitation ◽  
Decay Behavior

AbstractUp-converting thermographic phosphors are of significant interest due to specific advantages for temperature measurement applications over traditional contact-based methods. Typically, infrared excitation stimulates visible fluorescence only from the target phosphor and not the surrounding medium. This is in contrast to ultraviolet excitation which may also produce interfering luminescence from cells and other biological tissue in the vicinity, for instance. When traversing a material, usually infrared losses due to scattering and absorption are less than for ultraviolet wavelengths. An example is human skin. This investigation follows logically from earlier efforts incorporating thermographic phosphors into elastomers and aerogels and their function as a reusable temperature sensor has been previously demonstrated by the authors. Layered phosphor/PDMS/aerogel composites are also currently under investigation by the authors for heat flux sensing. For maximum utility and understanding; physical, optical and thermal properties are characterized over a wide range of temperatures. Y2O2S:Yb,Er and La2O2S:Yb,Er up-converting phosphor composites with a fixed doping concentration were synthesized for this study and fully characterized as a function of temperature. The excitation/ emission characteristics of the powder alone and the prepared composites were investigated between -50 °C and +200 °C in an environmental chamber and the decay behavior of each sample type was measured. Here, the authors report on decay behavior and emission intensity of the PDMS composites as a function of temperature. Results were compared with powder –only parameters and are reported here.

Calcium Vanadinite: An Alternative Apatite Host for Cl-rich Wastes

2014 ◽  
Vol 1665 ◽  
pp. 319-324 ◽  
Author(s):  
M. R. Gilbert
Keyword(s):  
Elevated Temperatures ◽  
Secondary Phase ◽  
Phase System ◽  
Secondary Phases ◽  
Waste Forms ◽  
Good Potential ◽  
Multi Phase

ABSTRACTApatites are often seen as good potential candidates for the immobilization of halide-rich wastes and, in particular, chlorapatite (Ca5(PO4)3Cl) has received much attention in recent years. However, synthesis of chlorapatite waste-forms can produce a complicated multi-phase system, with a number of secondary phases forming, including β-TCP (Ca3(PO4)2), spodiosite (Ca2(PO4)Cl) and pyrophosphate (Ca2P2O7), many of which require elevated temperatures and extended calcinations times to reduce. Calcium vanadinite (Ca5(VO4)3Cl) demonstrates a much simpler phase system, with calcination at 750 °C yielding Ca5(VO4)3Cl together a small quantity of a Ca2V2O7secondary phase, the formation of which can be retarded by the addition of excess CaCl2. Characterization of compositions doped with SmCl3as an inactive analogue for AnCl3show the Cl to be immobilized in the vanadinite whilst the Sm forms a wakefieldite (SmVO4) phase.

Characterization of Rockfish Skin Gelatin Composite Films

2017 ◽  
Vol 46 (3) ◽  
pp. 394-399 ◽  
Author(s):  
Song-Ee Beak ◽  
Hyeri Kim ◽  
Kyung Bin Song
Keyword(s):  
Composite Films

Polymer Chemistry

2004 ◽  
Keyword(s):  
Conducting Polymers ◽  
Liquid Crystalline ◽  
Polymer Chemistry ◽  
Chain Growth ◽  
Crystalline Polymers ◽  
Wide Range ◽  
Cyclic Oligomers ◽  
Step Growth

Polymer Chemistry: A Practical Approach in Chemistry has been designed for both chemists working in and new to the area of polymer synthesis. It contains detailed instructions for preparation of a wide-range of polymers by a wide variety of different techniques, and describes how this synthetic methodology can be applied to the development of new materials. It includes details of well-established techniques, e.g. chain-growth or step-growth processes together with more up-to-date examples using methods such as atom-transfer radical polymerization. Less well-known procedures are also included, e.g. electrochemical synthesis of conducting polymers and the preparation of liquid crystalline elastomers with highly ordered structures. Other topics covered include general polymerization methodology, controlled/"living" polymerization methods, the formation of cyclic oligomers during step-growth polymerization, the synthesis of conducting polymers based on heterocyclic compounds, dendrimers, the preparation of imprinted polymers and liquid crystalline polymers. The main bulk of the text is preceded by an introductory chapter detailing some of the techniques available to the scientist for the characterization of polymers, both in terms of their chemical composition and in terms of their properties as materials. The book is intended not only for the specialist in polymer chemistry, but also for the organic chemist with little experience who requires a practical introduction to the field.

Preparation and characterization of the acrylic latex-laminating adhesives applied in BOPP/PE composite films

2018 ◽  
Vol 76 (9) ◽  
pp. 4469-4483
Author(s):  
Liang Jiang ◽  
Bo Wu ◽  
Yuan Lei ◽  
Yuanyuan Jiang ◽  
Jingxin Lei
Keyword(s):  
Composite Films ◽  
Acrylic Latex

scholarly journals Organelle Genetics in Plants

2021 ◽  
Vol 22 (4) ◽  
pp. 2104
Author(s):  
Pedro Robles ◽  
Víctor Quesada
Keyword(s):  
Rna Editing ◽  
Posttranscriptional Regulation ◽  
Genome Engineering ◽  
Plant Mitochondria ◽  
Plastid Dna ◽  
Chloroplast Genomes ◽  
Wide Range ◽  
Organelle Genetics ◽  
Selection Of

Eleven published articles (4 reviews, 7 research papers) are collected in the Special Issue entitled “Organelle Genetics in Plants.” This selection of papers covers a wide range of topics related to chloroplasts and plant mitochondria research: (i) organellar gene expression (OGE) and, more specifically, chloroplast RNA editing in soybean, mitochondria RNA editing, and intron splicing in soybean during nodulation, as well as the study of the roles of transcriptional and posttranscriptional regulation of OGE in plant adaptation to environmental stress; (ii) analysis of the nuclear integrants of mitochondrial DNA (NUMTs) or plastid DNA (NUPTs); (iii) sequencing and characterization of mitochondrial and chloroplast genomes; (iv) recent advances in plastid genome engineering. Here we summarize the main findings of these works, which represent the latest research on the genetics, genomics, and biotechnology of chloroplasts and mitochondria.

Production and Characterization of Nontoxic and Biodegradable Chitosan–Ectomycorrhizal Fungi Spores Blend Films

2021 ◽  
Author(s):  
Bahar Akyuz Yilmaz ◽  
Tugce Karaduman ◽  
Mehmet Cicek ◽  
Ilgaz Akata ◽  
Murat Kaya
Keyword(s):  
Ectomycorrhizal Fungi ◽  
Blend Films
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