Article
Chemistry, Multidisciplinary
Lukas Gromotka, Maximilian Johannes Uttinger, Carola Schlumberger, Matthias Thommes, Wolfgang Peukert
Summary: This paper demonstrates the application of size-exclusion chromatography (SEC) in the classification and characterization of multimodal distributions of nanoparticles over a broad size range. The study shows that SEC can accurately determine the size distribution of complex nanoparticle dispersions and fractionate mixtures into coarse and fine fractions.
Article
Chemistry, Physical
R. Fathima, A. Mujeeb
Summary: Ligand-free Au-Pt bimetallic nanoparticles were synthesized using laser ablation, showing enhanced nonlinear optical and thermo optical characteristics compared to mono metallic nanoparticles and pre-irradiation colloidal mix.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Optics
Jisha John, Achamma Kurian, Sajan D. George
Summary: The study investigates the variation in the thermal properties of dye-plasmonic nanoparticle mixtures upon the addition of Hg2+ ions using laser-based techniques. The absorption peak wavelength and spectrum shape are found to be sensitive to the presence of Hg2+ ions, leading to changes in the thermal diffusivity values. Additionally, the study reveals that divalent metal ions are more efficient in altering the thermal and optical properties of the mixtures.
Article
Acoustics
Xiaoqian Su, Umesh Sai Jonnalagadda, Lakshmi Deepika Bharatula, James Jing Kwan
Summary: In this study, submicron gasstabilising gold nanocones (gs-AuNCs) that are acoustically responsive were synthesized to afford greater reaction rates compared to conventional gold catalysts. Cavitation nucleated from gs-AuNCs significantly increased the sonocatalytic degradation of water pollutants without the need for co-catalysts. The ability to amplify catalysis with ultrasound by tailoring the morphology of the catalyst to control cavitation opens new paths for future designs of sonocatalysts for sustainable chemical processes.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Materials Science, Ceramics
Naseem Fatima, A. G. Pramod, G. Jagannath, R. Rajaramakrishna, K. Keshavamurthy, P. Ramesh, K. N. Sathish, Abdullah M. S. Alhuthali, M. Sayyed, Vinod Hegde, S. Venugopal Rao, Y. F. Nadaf
Summary: Eu3+-activated glasses doped with Ag0 nanoparticles were fabricated using the melt quench method. The presence of Ag0 nanoparticles was confirmed by surface plasmon resonance peaks and transmission electron microscopy. Non-linear optical properties increased with AgNO3 concentration up to 0.6 mol %, before decreasing at higher concentrations.
CERAMICS INTERNATIONAL
(2021)
Article
Instruments & Instrumentation
K. Gurushantha, G. Jagannath, S. B. Kolavekar, A. G. Pramod, Aljawhara H. Almuqrin, M. I. Sayyed, Narlagiri Linga Murthy, S. Venugopal Rao, K. Keshavamurthy
Summary: We conducted experimental measurements on the effect of annealing and intensity-dependent femtosecond third-order nonlinear optical attributes of gold nanoparticles embedded sodium borate glass specimens. The highest saturation intensity and nonlinear refraction magnitude were observed for the 7-hour annealed glass specimen. Nonlinear optical measurements were performed on the NBAu-7 glass, showing a switch from saturable absorption behavior to reverse saturable absorption at high fluence laser pulses.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Hong Yi, Kimberly M. Osten, Tetyana Levchenko, Alex J. Veinot, Yoshitaka Aramaki, Takashi Ooi, Masakazu Nambo, Cathleen M. Crudden
Summary: A series of chiral Au-13 nanoclusters were successfully synthesized and characterized, exhibiting high luminescence and stability. This opens up opportunities for further investigation into the impact of chirality on the properties of these clusters.
Article
Chemistry, Physical
Padmanabh B. Joshi, Andrew J. Wilson
Summary: Plasmon excitation of metal electrodes enhances energy related electrochemical transformations, but low solubility of nonpolar gases and molecular reagents limits product formation in aqueous media. This study measures the enhancement of electrochemical water reduction using plasmonically excited electrodes in a nonaqueous solvent. The photopotential decreases rapidly with increasing solvent polarity and H2O concentration.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Energy & Fuels
Merwan Benhabib, Samuel L. Kleinman, Mark C. Peterman
Summary: Amines are used in various processes in the oil and gas industry, but their presence can cause problems such as corrosion and nitrification. Traditional methods of amine analysis are not suitable for field deployment. We propose a new method using surface-enhanced Raman spectroscopy for accurate and quick quantification of problem-causing amines. This method is stable, calibration-free, and can be performed by minimally trained operators within 5 minutes.
Article
Energy & Fuels
Merwan Benhabib, Samuel L. Kleinman, Mark C. Peterman
Summary: Amines are utilized in various areas of the petroleum industry for different purposes such as hydrogen sulfide removal, corrosion prevention, and pH control. However, leftover amines can negatively affect the refining process by causing corrosion or nitrification. Traditional analytical methods like ion chromatography are inconvenient for field use. This study presents a new calibration-free technique for amine quantification using surface-enhanced Raman spectroscopy, specifically targeting problem-causing amines like monoethanolamine and methylamine. This method is accurate, stable, and can be performed quickly by minimally trained operators.
Article
Chemistry, Analytical
Elizaveta P. Morozova, Tatiana E. Smoliarova, Kirill A. Lukyanenko, Maria A. Kirillova, Mikhail N. Volochaev, Anna S. Kichkailo, Rajeev Ranjan, Valentina A. Kratasyuk
Summary: The assessment of microbial contamination is crucial for ensuring food safety. A modern method for evaluating contamination is estimating ATP using firefly luciferase. This study found that gold nanoparticles stabilized with benzalkonium chloride and Triton X-100 enhanced the bioluminescent system, resulting in higher sensitivity for developing an ATP biosensor.
Article
Engineering, Biomedical
Kaveh Roshanbinfar, Maria Kolesnik-Gray, Miriam Angeloni, Stefan Schruefer, Maren Fiedler, Dirk W. Schubert, Fulvia Ferrazzi, Vojislav Krstic, Felix B. Engel
Summary: Cardiac tissue engineering is a promising strategy to prevent heart failure, but several issues remain unsolved. This study develops a biohybrid hydrogel that enhances the beating properties of engineered cardiac tissues and allows for concurrent drug release.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Niklas O. Junker, Anja Lindenau, Michael Ruetten, Marcel Lach, Alexander Nedilko, Dmitry N. Chigrin, Gero von Plessen, Tobias Beck
Summary: The optical properties of 3D metacrystals made of gold nanoparticles in protein nanocages are investigated. These metacrystals have good structural and optical quality with sizes in the tens of micrometers range. Through microspectroscopy measurements and model calculations, it is shown that the metacrystals exhibit plasmonic absorption in the green wavelength range and are mostly transparent in the red and infrared ranges. By using empty nanocages as placeholders in the metacrystal lattice, the absorption strength of the metamaterial can be controlled. Measurements on a pyramidal metacrystal demonstrate deflection of visible light, indicating anomalous refraction at short wavelengths and normal refraction at long wavelengths. The refractive dispersion is attributed to the optical dispersion relation of the plasmonic metamaterial.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Giuliano Coletta, Vincenzo Amendola
Summary: Combining plasmonic (gold, silver) and latex nanoparticles can improve the performance of immuno-turbidimetric assays without compromising the measurement dynamic range, providing a successful strategy to enhance the detection limit and maintain all the advantages of homogeneous immuno-turbidimetric assays.
Article
Physics, Condensed Matter
Samar Mamdouh, Alaa Mahmoud, Ahmed Samir, Mohamed Mobarak, Tarek Mohamed
Summary: The nonlinear optical properties of silver nanoparticles colloids in distilled water were investigated using the Z-scan technique. The study found that increasing the laser ablation energy fluence resulted in smaller nanoparticle size and larger bandgap energy, while the nonlinear absorption coefficient and nonlinear refractive index decreased.
PHYSICA B-CONDENSED MATTER
(2022)
