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Property Tuning in N-Methylpyrrole Azo-Photoswitches via Modification of the Peripheral Substituents.
Chemistry
December 2024
Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice, 53210, Czech Republic.
Differently substituted pyrrole-azo-benzene molecular photoswitches were prepared in a straightforward synthetic way. Their fundamental properties were investigated by XRD analysis, differential scanning calorimetry, thermogravimetric analysis, cyclic voltammetry, UV-Vis absorption spectroscopy, Hyper-Rayleigh Scattering, and NMR spectroscopy; the experimental results were further corroborated by DFT calculations. Thermal robustness, the HOMO/LUMO levels, and the absorption properties were altered mostly by substituting the N-methylpyrrole moiety and further fine-tuned by modifying the benzene substituents.
View Article and Find Full Text PDFBiomarker detection based on nanoparticle-induced ultrasonic Rayleigh scattering.
Microsyst Nanoeng
December 2024
Key Laboratory of Optoelectronic Technology and Systems, Ministry of Education and International Research and Development Center of Micro-Nano Systems and New Materials Technology, Chongqing University, Chongqing, 400044, China.
Article Synopsis
- Ultrasonic biochemical detection is crucial for identifying biomarkers and monitoring drugs, but current methods are expensive and unreliable, making them unsuitable for low-cost rapid testing.
- This study introduces a new detection mechanism using Rayleigh scattering from nanoparticles, which alters sound pressure and enhances measurement reliability by modifying antibodies on a separate substrate.
- Results show that using a CMUT chip, the detection of CA19-9 cancer antigen is successful across various concentrations, while minimizing interference from other markers, proving the effectiveness of this approach.
Enhanced integrated acoustofluidics with printed circuit board electrodes attached to piezoelectric film coated substrate.
Ultrasonics
March 2025
School of Engineering, Cardiff University, UK CF24 3AA. Electronic address:
The current key issues in applying acoustofluidics in engineering lie in the inflexibility of manufacturing processes, particularly those involving modifications to piezoelectric materials and devices. This leads to inefficient prototyping and potentially high costs. To overcome these limitations, we proposed a technique that is capable of prototyping acoustofluidic devices in a straightforward manner.
View Article and Find Full Text PDFMechanisms of multi-layered Rayleigh noise in Brillouin optical correlation-domain reflectometry.
Sci Rep
October 2024
Faculty of Engineering, Yokohama National University, Yokohama, 240-8501, Japan.
In Brillouin optical correlation-domain reflectometry (BOCDR), sinusoidal modulation is applied to the output frequency of a light source, with spatial resolution inversely related to the modulation amplitude. We have developed an effective method to estimate the modulation amplitude using the width of the noise spectrum caused by Rayleigh scattering, eliminating the need for an optical spectrum analyzer or modifications to existing equipment. However, the Rayleigh noise spectrum often displays a three-layered structure, complicating the identification of the appropriate spectral components for estimating the modulation amplitude.
View Article and Find Full Text PDFAcoustic radiation characteristics of shark skin inspired surface modified plates.
Sci Rep
October 2024
Dept of Ocean Engineering and Naval Architecture, IIT Kharagpur, Kharagpur, West Bengal, 721302, India.
This paper aims to evaluate the acoustic radiation characteristics of thin plates featuring a layer of small-scale biomimetic shark skin type additive surface treatment. The shark skin dermal denticles are modelled as point masses arranged in a bi-directional pattern on both the upper and lower surfaces of the plate. The governing equations are obtained through a variational approach, incorporating the Dirac Delta function in the derivation of the proposed semi-analytical model for the shark skin layer.
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