Advertisement

Topics

Spectroscopic Study on the Polymer Condensates Formed via Pyrolysis of Levitated Droplets of Dicyanamide-Containing Ionic Liquids.

07:00 EST 4th February 2019 | BioPortfolio

Summary of "Spectroscopic Study on the Polymer Condensates Formed via Pyrolysis of Levitated Droplets of Dicyanamide-Containing Ionic Liquids."

To investigate the suitability of ionic-liquid-based hypergolic fuels as replacements for traditional hydrazine-based propellants, a 1-methyl-4-amino-1,2,4-triazolium dicyanamide ([MAT][DCA]) droplet, with and without hydrogen-capped boron nanoparticles, was acoustically levitated in argon and heated to successively higher temperatures by a carbon dioxide laser. At each temperature, in situ Fourier-transform infrared and near-infrared, Raman, and UV-visible spectra were recorded. The droplet became increasingly yellow before exploding at 400 K to produce a brown foam-like substance and dense smoke. The foam was subsequently studied ex situ by X-ray photoelectron spectroscopy, infrared diffuse-reflectance spectroscopy, and elemental analysis. The combined spectroscopic analyses suggest that the foam is formed by linking two or more melamine molecules to yield a combination of melem, melon, and possibly graphitic carbon nitride. At least 37 ± 3% of the [MAT][DCA] liquid was transformed into the stable, solid-state foam, which would be problematic for the use of such an IL-based hypergolic fuel in rocket engines. 1-Butyl-3-methylimidazolium dicyanamide ([BMIM][DCA]) did not explode and form the foam even at temperatures of up to 430 K. Elimination of the amino group (-NH) during the decomposition of [MAT] to volatile products or the increased energy density provided by the additional nitrogen atom in the triazolium ring therefore seem to be required to produce the foam. The present results, provided by an original and accurate experimental technique, elucidate how the nitrogen content affects the stability of an ionic liquid and reveal potential hazards when implementing ionic liquids in bipropellant systems.

Affiliation

Journal Details

This article was published in the following journal.

Name: The journal of physical chemistry. A
ISSN: 1520-5215
Pages:

Links

DeepDyve research library

PubMed Articles [14300 Associated PubMed Articles listed on BioPortfolio]

Highly Flexible and Ultra-Precise Manipulation of Light Levitated Femtolitre/Picolitre Droplets.

The ultra-precise manipulation of the droplets at the microscale is a promising paradigm for broad implications in reagent transport and element analysis but the existing strategies still suffer from ...

Salt-Dependent Rheology and Surface Tension of Protein Condensates Using Optical Traps.

An increasing number of proteins with intrinsically disordered domains have been shown to phase separate in buffer to form liquidlike phases. These protein condensates serve as simple models for the i...

Investigation into role of CO in two-stage pyrolysis of spent coffee grounds.

As a way of improving process efficiency of pyrolysis of waste biomass, the effect of carbon dioxide (CO) on pyrolysis of spent coffee grounds (SCGs) was examined using a two-stage pyrolysis reactor c...

Factors affecting the sorption of halogenated phenols onto polymer/biomass-derived biochar: Effects of pH, hydrophobicity, and deprotonation.

High-performance biochar synthesized via co-pyrolysis of a polymer and rice straw (RS) was evaluated as a sorbent for ionizable halogenated phenols. Compared with RS-derived biochar, the sorption of 2...

Investigation on emission control of NO precursors and phosphorus reclamation during pyrolysis of ferric sludge.

In this study, a method to reduce the emission of NO precursors (e.g., hydrogen cyanide (HCN) and ammonia (NH)) while simultaneously reclaim more plant-available P was proposed through pyrolyzing ferr...

Clinical Trials [430 Associated Clinical Trials listed on BioPortfolio]

Emulsion Droplet Physical State on Postprandial Lipemia and Satiety

The purpose of this study is to compare the changes in blood lipids and feelings of satiety after consumption of oil-in-water emulsions in which the droplets are in either the liquid or so...

Development of a Noninvasive Method of Evaluation of Pulmonary Inflammation in the Condensates of Exhaled Air

The aim of the study is identify biological parameters reflecting proteolytic activity in the exhaled condenstaes which might be useful to follow up pulmonary inflammation in various condi...

Spectroscopic Evaluation of Cervical Neoplasia

The overall objective of this study is to evaluate whether fluorescence and reflectance spectroscopy can improve the ability to detect the presence of premalignant lesions on the cervix. ...

Rapamycin-Eluting Stents With Different Polymer Coating to Reduce Restenosis (ISAR-TEST-3)

The purpose of this study is to evaluate the efficacy of 3 different rapamycin-eluting-stent platforms to reduce coronary artery reblockage after stent implantation

EASYX-1 : A Multicenter Study on Safety and Efficacy of Easyx Liquid Embolization Agent Used in Five Separate Indications

The EASYX™ Liquid Embolic is a new injectable, precipitating polymeric agent for the obliteration of vascular spaces through direct puncture or catheter access performed under X-ray guid...

Medical and Biotech [MESH] Definitions

Strongly cationic polymer that binds to certain proteins; used as a marker in immunology, to precipitate and purify enzymes and lipids. Synonyms: aziridine polymer; Epamine; Epomine; ethylenimine polymer; Montrek; PEI; Polymin(e).

A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry.

A perilipin that localizes to LIPID DROPLETS; CYTOPLASM; ENDOSOMES; and PLASMA MEMBRANE, especially in MACROPHAGES. It functions as a transporter of free fatty acids to lipid droplets to promote their biogenesis and growth. It is also required for the transport of the MANNOSE-6-PHOSPHATE RECEPTOR from endosomes to the TRANS-GOLGI NETWORK. Its structure consists of four helix bundles that interact with the hydrophobic lipid droplet surface.

A perilipin that is expressed by many different cell types. It binds FATTY ACIDS and CHOLESTEROL, stabilizes TRIGLYCERIDES, and localizes to both the surface and hydrophobic core of LIPID DROPLETS, as well as the ENDOPLASMIC RECTICULUM and PLASMA MEMBRANE in MACROPHAGES. It also plays a central role in the biogenesis of lipid droplets and FOAM CELLS and is highly expressed by macrophages at atherosclerotic lesions in human arteries along with the INFLAMMATION markers TNF-ALPHA; MCP-1 RECEPTOR; and IL-6.

A polymer obtained by reacting polyacrylic acid with a special anion-leachable glass (alumino-silicate). The resulting cement is more durable and tougher than others in that the materials comprising the polymer backbone do not leach out.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Relevant Topic

Radiology
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...


Searches Linking to this Article