A fast and remote screening method for sub-micro-structuration in pressurized mixtures containing water and carbon dioxide

Stehle, Simon; Lay, Ebrahim Nemati; Triolo, Alessandro; Ventosa, Nora; Braeuer, Andreas

doi:10.1016/j.supflu.2019.104555

Cited by 3 publications

(5 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides a background subtraction and a baseline correction, spectral regions where signals of different substances overlap have to be treated specially to isolate the relevant peaks. In the subsections that follow we describe the measures taken to efficiently isolate the Raman signals of oxygen, nitrogen, and ethanol from the Raman spectra of the mixtures and how we determined the intensity of the respective Raman signals …”

Section: Methodsmentioning

confidence: 99%

“…In the subsections that follow we describe the measures taken to efficiently isolate the Raman signals of oxygen, nitrogen, and ethanol from the Raman spectra of the mixtures and how we determined the intensity of the respective Raman signals. 17 2.3.1. Processing of Liquid Phase Spectra.…”

Section: Data Evaluationmentioning

confidence: 99%

“…In combination with the use of microcapillaries the experimental time and the sample volume are significantly lower compared to investigations in high pressure cells. 17 Most importantly, the danger that an ignition would cause is minimized down to an acceptable effect with the setup described in following section. The VLE of ethanol and oxygen, as well as of ethanol and two oxygen/nitrogen mixtures, were studied.…”

Section: Introductionmentioning

confidence: 99%

“…In the experiments presented in this manuscript, in situ Raman spectroscopy is applied to avoid the problem of thermodynamic affection. In combination with the use of microcapillaries the experimental time and the sample volume are significantly lower compared to investigations in high pressure cells . Most importantly, the danger that an ignition would cause is minimized down to an acceptable effect with the setup described in following section.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Vapor–Liquid Equilibria of Mixtures Containing Ethanol, Oxygen, and Nitrogen at Elevated Pressure and Temperature, Measured with In Situ Raman Spectroscopy in Microcapillaries

Fechter

Braeuer

2020

J. Chem. Eng. Data

View full text Add to dashboard Cite

Ethanol and oxygen containing gases are mixed in a T-junction at elevated pressure and then passed into a fused silica microcapillary, located in a heating block. Inside the microcapillary a Taylor flow of alternating liquid and vapor segments is formed. The thermodynamic equilibrium composition of the liquid and vapor segment depends on pressure and temperature. Their compositions are measured inside the microcapillary using in situ Raman spectroscopy. The main results obtained therefrom are temperature–composition ( Tx ) diagrams at conditions relevant for combustion engines [ p = (3 to 8) MPa; T = (303 to 473) K]. Isothermal vapor–liquid equilibria (VLE) data are derived and given in pressure–composition ( px ) diagrams. The investigation of different gas mixtures containing oxygen and nitrogen allows furthermore the illustration of VLE data at constant pressure and temperature in ternary diagrams. The obtained results are compared to scarce literature data. An equation of state (Peng–Robinson EOS) is furthermore adjusted to the measured results.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Data Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vapor–Liquid Equilibria of Mixtures Containing Ethanol, Oxygen, and Nitrogen at Elevated Pressure and Temperature, Measured with In Situ Raman Spectroscopy in Microcapillaries

Fechter

Braeuer

2020

J. Chem. Eng. Data

View full text Add to dashboard Cite

show abstract

“…Finally, we examined the effectiveness of the photodeposition on the inner surface of the silica glass microcapillaries by micro-Raman spectroscopy. Thus far, in-depth micro-Raman spectroscopy has been used for sub-micro-structurization and vapor–liquid phase transition in a high-pressure microcapillary cell, as well as to study biological molecules and to identify primary human bronchial epithelial cells . Regarding GLP sensing, the GLP content was determined with surface-enhanced Raman scattering (SERS) spectroscopy using gold nanoparticles and silver composites .…”

Section: Introductionmentioning

confidence: 99%

In-Capillary Photodeposition of Glyphosate-Containing Polyacrylamide Nanometer-Thick Films

Mazuryk

Klepacka

Piechowska

et al. 2022

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

The present research reports on in-water, site-specific photodeposition of glyphosate (GLP)-containing polyacrylamide (PAA-GLP) nanometer-thick films (nanofilms) on an inner surface of fused silica (fused quartz) microcapillaries presilanized with trimethoxy(octen-7yl)silane (TMOS). TMOS was chosen because of the vinyl group presence in its structure, enabling its participation in the (UV light)activated free-radical polymerization (UV-FRP) after its immobilization on a fused silica surface. The photodeposition was conducted in an aqueous (H 2 O/ACN; 3:1, v/v) solution, using UV-FRP (λ = 365 nm) of the acrylamide (AA) functional monomer, the N,N′-methylenebis(acrylamide) (BAA) cross-linking monomer, GLP, and the azobisisobutyronitrile (AIBN) UV-FRP initiator. Acetonitrile (ACN) was used as the porogen and the solvent to dissolve monomers and GLP. Because of the micrometric diameters of microcapillaries, the silanization and photodeposition procedures were first optimized on fused silica slides. The introduction of TMOS, as well as the formation of PAA and PAA-GLP nanofilms, was determined using atomic force microscopy (AFM), scanning electron microscopy with energy-dispersive X-ray (SEM−EDX) spectroscopy, and confocal micro-Raman spectroscopy. Particularly, AFM and SEM−EDX measurements determined nanofilms' thickness and GLP content, respectively, whereas in-depth confocal (micro-Raman spectroscopy)-assisted imaging of PAA-and PAA-GLP-coated microcapillary inner surfaces confirmed the successful photodeposition. Moreover, we examined the GLP impact on polymer gelation by monitoring hydration in a hydrogel and a dried powder PAA-GLP. Our study demonstrated the usefulness of the in-capillary micro-Raman spectroscopy imaging and in-depth profiling of GLP-encapsulated PAA nanofilms. In the future, our simple and inexpensive procedure will enable the fabrication of polymer-based microfluidic chemosensors or adsorptive-separating devices for GLP detection, determination, and degradation.

show abstract

The influence of temperature and pressure on macro- and micro-mixing in compressed fluid flows; mixing of carbon dioxide and ethanol above their mixture critical pressure

Bassing

Braeuer

2021

The Journal of Supercritical Fluids

View full text Add to dashboard Cite

A fast and remote screening method for sub-micro-structuration in pressurized mixtures containing water and carbon dioxide

Cited by 3 publications

References 35 publications

Vapor–Liquid Equilibria of Mixtures Containing Ethanol, Oxygen, and Nitrogen at Elevated Pressure and Temperature, Measured with In Situ Raman Spectroscopy in Microcapillaries

Vapor–Liquid Equilibria of Mixtures Containing Ethanol, Oxygen, and Nitrogen at Elevated Pressure and Temperature, Measured with In Situ Raman Spectroscopy in Microcapillaries

In-Capillary Photodeposition of Glyphosate-Containing Polyacrylamide Nanometer-Thick Films

The influence of temperature and pressure on macro- and micro-mixing in compressed fluid flows; mixing of carbon dioxide and ethanol above their mixture critical pressure

Contact Info

Product

Resources

About