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In this study we explored a possibility for enhancing aqueous sorption of humic substances (HS) onto hydroxylated surfaces (e.g., silica gel) by increasing modification rate of their most abundant functional groups – carboxyls with mineral-adhesive alkoxysilyl moieties. The synthesis included treatment of dried humic material with 3-aminopropyl trimethoxy silane (APTS) capable of forming amide bonds...
An ultrasound-based method to locally assess the shear modulus of a medium is reported. The proposed approach is based on the application of an impulse acoustic radiation force to an inhomogeneity in the medium and subsequent monitoring of the spatio-temporal response. In our experimental studies, a short pulse produced by a 1.5-MHz highly focused ultrasound transducer was used to initiate the motion...
Highly proliferative cancer cells over express molecular markers such as epidermal growth factor receptor (EGFR). When specifically targeted gold nanoparticles bind to EGFR they tend to cluster on the cell membrane leading to an optical red-shift in the plasmon resonance frequency and an increase in absorption in the red region. These changes in optical properties provide the opportunity for photoacoustic...
Intravascular photoacoustic (IVPA) imaging aims to detect and differentiate atherosclerotic plaques based on the optical absorption of the plaque constituents. From the high resolution IVPA images and the corresponding co-registered intravascular ultrasound (IVUS) images, functional and structural information about the atherosclerotic plaque can be acquired and, therefore, the vulnerability of the...
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