scholarly journals Magnetic Graphene Quantum Dots Facilitate Closed-Tube One-Step Detection of SARS-CoV-2 with Ultra-Low Field NMR Relaxometry

2021 ◽  
pp. 129786
Author(s):  
Yongqiang Li ◽  
Peixiang Ma ◽  
Quan Tao ◽  
Hans-Joachim Krause ◽  
Siwei Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Step Detection ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Magnetic Graphene ◽  
Closed Tube ◽  
One Step ◽  
Low Field Nmr

One step electro-oxidative preparation of graphene quantum dots from wood charcoal as a peroxidase mimetic

Talanta ◽  
2017 ◽  
Vol 173 ◽  
pp. 36-43 ◽  
Author(s):  
Narsingh R. Nirala ◽  
Gaurav Khandelwal ◽  
Brijesh Kumar ◽  
Vinita ◽  
Rajiv Prakash ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Wood Charcoal ◽  
Peroxidase Mimetic ◽  
One Step

scholarly journals One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 104 ◽  
Author(s):  
Rabeb El-Hnayn ◽  
Laetitia Canabady-Rochelle ◽  
Christophe Desmarets ◽  
Lavinia Balan ◽  
Hervé Rinnert ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Colloidal Stability ◽  
Antioxidant Activities ◽  
Graphene Quantum Dots ◽  
Average Diameter ◽  
Functionalized Graphene ◽  
One Step ◽  
Low Cytotoxicity ◽  
Health Applications

2,2’-(Ethylenedioxy)bis(ethylamine)-functionalized graphene quantum dots (GQDs) were prepared under mild conditions from graphene oxide (GO) via oxidative fragmentation. The as-prepared GQDs have an average diameter of ca. 4 nm, possess good colloidal stability, and emit strong green-yellow light with a photoluminescence (PL) quantum yield of 22% upon excitation at 375 nm. We also demonstrated that the GQDs exhibit high photostability and the PL intensity is poorly affected while tuning the pH from 1 to 8. Finally, GQDs can be used to chelate Fe(II) and Cu(II) cations, scavenge radicals, and reduce Fe(III) into Fe(II). These chelating and reducing properties that associate to the low cytotoxicity of GQDs show that these nanoparticles are of high interest as antioxidants for health applications.

Capillary Trapping of CO 2 in Sandstone Using Low Field NMR Relaxometry

2019 ◽  
Vol 55 (12) ◽  
pp. 10466-10478 ◽  
Author(s):  
Paul R. J. Connolly ◽  
Sarah J. Vogt ◽  
Mohamed Mahmoud ◽  
Christopher N. Y. Ng ◽  
Eric F. May ◽  
...  
Keyword(s):  
Capillary Trapping ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Low Field Nmr

In-situ heavy oil viscosity prediction at high temperatures using low-field NMR relaxometry and nonlinear least squares

Fuel ◽  
2020 ◽  
Vol 260 ◽  
pp. 116328 ◽  
Author(s):  
Strahinja Markovic ◽  
Jonathan L. Bryan ◽  
Aman Turakhanov ◽  
Alexey Cheremisin ◽  
Sudarshan A. Mehta ◽  
...  
Keyword(s):  
Least Squares ◽  
High Temperatures ◽  
Heavy Oil ◽  
Nonlinear Least Squares ◽  
Oil Viscosity ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Viscosity Prediction ◽  
Low Field Nmr

scholarly journals Qualification of automated low-field NMR relaxometry for quality control of polymers in a production setting

2007 ◽  
Vol 26 (8) ◽  
pp. 1015-1024 ◽  
Author(s):  
Sarah C. Chinn ◽  
Angela Cook-Tendulkar ◽  
Robert Maxwell ◽  
Hilary Wheeler ◽  
Mark Wilson ◽  
...  
Keyword(s):  
Quality Control ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Low Field Nmr

Synthesis of N-doped graphene quantum dots by pulsed laser ablation with diethylenetriamine (DETA) and their photoluminescence

2017 ◽  
Vol 19 (33) ◽  
pp. 22395-22400 ◽  
Author(s):  
S. R. M. Santiago ◽  
T. N. Lin ◽  
C. H. Chang ◽  
Y. A. Wong ◽  
C. A. J. Lin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laser Ablation ◽  
Graphene Quantum Dots ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Doped Graphene ◽  
One Step

We report a facile, fast, and one-step approach to prepare N-doped graphene quantum dots (GQDs) using pulsed laser ablation with diethylenetriamine (DETA).

scholarly journals Characterization of unsaturated porous media by high-field and low-field NMR relaxometry

2009 ◽  
Vol 45 (8) ◽  
Author(s):  
L. R. Stingaciu ◽  
A. Pohlmeier ◽  
P. Blümler ◽  
L. Weihermüller ◽  
D. van Dusschoten ◽  
...  
Keyword(s):  
Porous Media ◽  
High Field ◽  
Unsaturated Porous Media ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Low Field Nmr
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