Monitoring the solvation process and stability of Eu2+ in an ionic liquid by in situ luminescence analysis

AbstractIonic liquids (ILs) offer the remarkable possibility of the direct synthesis of Eu2+-doped nanophosphors in solution, under atmospheric conditions, without the necessity of a high-temperature post-synthetic reduction from its trivalent oxidation state. This work uses for the first time in situ luminescence measurements for monitoring the solvation process of Eu2+ from the solid salt to the IL and its stability against oxidation under atmospheric conditions. Upon the addition of EuBr2 to 1-butyl-3-methyl-imidazolium tetrafluoroborate, the formation of the solvation shell is detected by the shift of the emission band at approximately 24 100 cm−1 assigned to the 5d→4f electronic transitions of Eu2+ within EuBr2 to approximately 22 000 cm−1, assigned to Eu2+ within BminBF4, tracking the time-dependent influence of the Eu2+ coordination environment on the crystal field splitting of its d orbitals. Even though the solubility of EuBr2 was demonstrated to be improved by reducing the concentration and increasing the temperature to 60°C, the performance of reactions at room temperature is recommended for future synthesis of Eu2+ materials in ILs due to the slight oxidation to Eu3+ observed upon heating.

Download Full-text

Incessant and economical technique for in-situ preparation of metallicnano on/in polyester fabric

Technische Textilien ◽

10.51202/0323-3243-2021-2-068 ◽

2021 ◽

Vol 64 (2) ◽

pp. 68-70

Author(s):

Satyajeet B. Chaudhari ◽

Bharat H. Patel ◽

Aadhar A. Mandot

Keyword(s):

Metal Ion ◽

Metallic Nanoparticles ◽

Room Temperature ◽

Polyester Fabric ◽

Atmospheric Conditions ◽

Spherical Nanoparticles ◽

In Situ Preparation

Composite textiles consisting of metallic nanoparticles dispersed in textiles fabric have been prepared by the reduction of metal ion from its salt at room temperature under normal atmospheric conditions. Morphology and structures have been investigated by SEM. Spherical nanoparticles were found to be homogeneously dispersed in/on the polyester (PET) fiber and the particles were elementally analyzed by the XRF technique.

Download Full-text

In situ growth and optical gas adsorption performance of Zn(ii) metal–organic framework membranes at room temperature

The Analyst ◽

10.1039/c9an00278b ◽

2019 ◽

Vol 144 (16) ◽

pp. 4887-4896 ◽

Cited By ~ 1

Author(s):

Mariyemu Tuergong ◽

Patima Nizamidin ◽

Abliz Yimit ◽

Rena Simayi

Keyword(s):

Room Temperature ◽

Gas Adsorption ◽

Uv Light ◽

Metal Organic Framework ◽

Adsorption Behaviors ◽

Uv Light Irradiation ◽

Unit Surface ◽

Metal Organic ◽

First Time

The optical gas adsorption behaviors of [Zn2(bdc)2(dpNDI)]n membranes were studied for the first time. Under UV light irradiation, they exhibited a greater adsorption response to xylene gas with adsorption capacity of 6.46 μg cm−2 per unit surface.

Download Full-text

In situ organogelation at room temperature: direct synthesis of gelators in organic solvents

Organic & Biomolecular Chemistry ◽

10.1039/b401683a ◽

2004 ◽

Vol 2 (8) ◽

pp. 1155 ◽

Cited By ~ 55

Author(s):

Masahiro Suzuki ◽

Yasushi Nakajima ◽

Mariko Yumoto ◽

Mutsumi Kimura ◽

Hirofusa Shirai ◽

...

Keyword(s):

Organic Solvents ◽

Room Temperature ◽

Direct Synthesis

Download Full-text

RF-Magnetron Sputtered Strontium Titanate: Structure, Processing and Property Relationships

MRS Proceedings ◽

10.1557/proc-603-57 ◽

1999 ◽

Vol 603 ◽

Cited By ~ 2

Author(s):

B.J. Gibbons ◽

Y. Fan ◽

A.T. Findikoglu ◽

D.W. Reagor ◽

Q.X. Jia

Keyword(s):

Room Temperature ◽

Low Frequency ◽

Ozone Treatment ◽

X Ray Diffraction ◽

X Ray ◽

Treated Sample ◽

Diffraction Peaks ◽

Compositional Variations ◽

First Time

AbstractThe low frequency dielectric properties of epitaxial SrTiO3 thin films deposited on LaAlO3 are presented. The films were deposited using radio-frequency magnetron sputtering from stoichiometric targets in an Ar/O2 atmosphere. For the first time, the effects of in situ ozone annealing during the early stages of deposition were explored. X-ray diffraction results indicated that the ozone treatment resulted in more symmetric and sharper diffraction peaks (2 Θ- FWHM decreased from 0.17° to 0.10°). In addition, the peaks for the ozone treated samples were shifted in 2 Θ towards values approaching the bulk value. Rutherford backscattering measurements showed Sr/Ti ratios of 1:1 for these samples, indicating these peak shifts are not due to compositional variations. The dielectric constant of the ozone treated samples increased from 275 at room temperature to 1175 at 22 K (measured at 100 kHz). The effective loss tangent of the device remained between 1 × 10−4 and 1 × 10−3 down to 100 K, where it began to increase. The tunability was also measured. The ozone treated sample showed tunability of 46%, 43% and 38% at 22 K, 40 K and 60 K, respectively. Finally, similar measurements were completed at 1 MHz, indicating a minimal dependence of these properties on frequencies in this range.

Download Full-text

Atmospheric Pressure Microplasma for Antibacterial Silver Nanoparticle/Chitosan Nanocomposites With Tailored Properties

10.26434/chemrxiv.9849806.v1 ◽

2019 ◽

Author(s):

Daye Sun ◽

Jonathan Turner ◽

Nan Jiang ◽

Songsong Zhu ◽

Li Zhang ◽

...

Keyword(s):

Silver Nanoparticle ◽

Atmospheric Pressure ◽

Room Temperature ◽

Polymer Network ◽

Antibacterial Properties ◽

Bacterial Strains ◽

E Coli ◽

Modified Chitosan ◽

First Time

Room temperature atmospheric pressure microplasma (APM) was deployed for the first time for the in situ synthesis of anti-bacterial silver nanoparticle / chitosan (AgNP/CS) nanocomposites. The plasma induced liquid chemistry plays a role in the in situ formation of AgNP, the size distribution of which depends on the silver salt precursor concentration. The microplasma process has also simultaneously tailored the physical properties of the composites, rendering more crosslinked chitosan polymer network with shorter molecular chains. The formation of AgNP within the in situ modified chitosan has led to nanocomposites with overall improved mechanical properties and better stability in simulated body fluid. Our plasma synthesized AgNP/CS nanocomposites also demonstrate effective antibacterial properties against E. Coli and S. Aureus bacterial strains, showing their promise in potential antimicrobial applications.

Download Full-text

Room-Temperature Migration of Ion-Implanted Boron in Silicon

MRS Proceedings ◽

10.1557/proc-469-53 ◽

1997 ◽

Vol 469 ◽

Cited By ~ 2

Author(s):

E. J. H. Collait ◽

K. Weemers ◽

D. J. Gravesteijn ◽

J. G. M. van Berkum ◽

N. E. B. Cowern

Keyword(s):

Ion Implantation ◽

Room Temperature ◽

First Time ◽

Ion Implanted

ABSTRACTRoom temperature migration and clustering behaviour of implanted boron into silicon has been investigated by performing ion implantation of the 11B isotope into MBE-grown in-situ 10B-doped epitaxial Si-layers. We, for the first time, show that a fraction of the implanted boron migrates very deep into the bulk of the Si with substitutional 10B acting as trap centers for the migrating 11B.

Download Full-text

Ultraviolet Photoluminescence Imaging of Stacking Fault Contraction in 4H-SiC Epitaxial Layers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.717-720.391 ◽

2012 ◽

Vol 717-720 ◽

pp. 391-394 ◽

Cited By ~ 7

Author(s):

Nadeemullah A. Mahadik ◽

Robert E. Stahlbush ◽

Joshua D. Caldwell ◽

Karl D. Hobart

Keyword(s):

Low Power ◽

Point Defects ◽

Room Temperature ◽

Stacking Fault ◽

Epitaxial Layers ◽

First Time ◽

Uv Excitation ◽

Line Direction

Shockley stacking fault (SSF) contraction in 4H-SiC was investigated, in-situ, under varying temperature and ultraviolet (UV) intensity. Contraction of single SSFs at room temperature was observed for the first time under low power UV excitation of 0.04 W/cm2. At temperatures above 150 °C, complete SSF contraction occurred for UV power at 0.2 W/cm2. In contrast to expansion, SSF contraction occurred in discrete jumps between pinning sites along existing C-core partials. Luminescence from the pinning sites suggest they may be local concentrations of point defects. Additionally, a change in the line direction of the Si-core partials by ~25o off the direction was observed.

Download Full-text

Microsensor Electrodes for 3D Inline Process Monitoring in Multiphase Microreactors

Sensors ◽

10.3390/s20174876 ◽

2020 ◽

Vol 20 (17) ◽

pp. 4876

Author(s):

Sebastian Urban ◽

Vinayaganataraj Tamilselvi Sundaram ◽

Jochen Kieninger ◽

Gerald Urban ◽

Andreas Weltin

Keyword(s):

Hydrogen Peroxide ◽

Channel Wall ◽

Diffusion Processes ◽

Direct Synthesis ◽

Vertical Axis ◽

Three Dimensions ◽

Channel Bottom ◽

First Time ◽

And Diffusion

We present an electrochemical microsensor for the monitoring of hydrogen peroxide direct synthesis in a membrane microreactor environment by measuring the hydrogen peroxide and oxygen concentrations. In prior work, for the first time, we performed in situ measurements with electrochemical microsensors in a microreactor setup. However, the sensors used were only able to measure at the bottom of the microchannel. Therefore, only a limited assessment of the gas distribution and concentration change over the reaction channel dimensions was possible because the dissolved gases entered the reactor through a membrane at the top of the channel. In this work, we developed a new fabrication process to allow the sensor wires, with electrodes at the tip, to protrude from the sensor housing into the reactor channel. This enables measurements not only at the channel bottom, but also along the vertical axis within the channel, between the channel wall and membrane. The new sensor design was integrated into a multiphase microreactor and calibrated for oxygen and hydrogen peroxide measurements. The importance of measurements in three dimensions was demonstrated by the detection of strongly increased gas concentrations towards the membrane, in contrast to measurements at the channel bottom. These findings allow a better understanding of the analyte distribution and diffusion processes in the microreactor channel as the basis for process control of the synthesis reaction.

Download Full-text

Atmospheric Pressure Microplasma for Antibacterial Silver Nanoparticle/Chitosan Nanocomposites With Tailored Properties

10.26434/chemrxiv.9849806 ◽

2019 ◽

Author(s):

Daye Sun ◽

Jonathan Turner ◽

Nan Jiang ◽

Songsong Zhu ◽

Li Zhang ◽

...

Keyword(s):

Silver Nanoparticle ◽

Atmospheric Pressure ◽

Room Temperature ◽

Polymer Network ◽

Antibacterial Properties ◽

Bacterial Strains ◽

E Coli ◽

Modified Chitosan ◽

First Time

Download Full-text

Ultra-sensitive polyaniline–iron oxide nanocomposite room temperature flexible ammonia sensor

RSC Advances ◽

10.1039/c5ra11512d ◽

2015 ◽

Vol 5 (84) ◽

pp. 68964-68971 ◽

Cited By ~ 53

Author(s):

D. K. Bandgar ◽

S. T. Navale ◽

M. Naushad ◽

R. S. Mane ◽

F. J. Stadler ◽

...

Keyword(s):

Iron Oxide ◽

Room Temperature ◽

Oxidative Polymerization ◽

Ammonia Sensor ◽

Chemical Oxidative Polymerization ◽

First Time ◽

Polymerization Method ◽

Pet Substrate

We report for the first time a room temperature smart NH3sensor based on PAni–Fe2O3nanocomposite loading on flexible PET substrate byin situchemical oxidative polymerization method.

Download Full-text