A5057759843- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Plasmonic and Surface Plasmon Research
- Biosensors and Analytical Detection
- Luminescence and Fluorescent Materials
- Nanocluster Synthesis and Applications
- Porphyrin and Phthalocyanine Chemistry
- Photodynamic Therapy Research Studies
- Electrospun Nanofibers in Biomedical Applications
- Conducting polymers and applications
- Skin Protection and Aging
- Advanced Biosensing Techniques and Applications
- Melanoma and MAPK Pathways
- Advanced Sensor and Energy Harvesting Materials
- Nanoplatforms for cancer theranostics
- Polymer Surface Interaction Studies
- Molecular Sensors and Ion Detection
- Nanocomposite Films for Food Packaging
- Antimicrobial agents and applications
Institute for Biotechnology and Bioengineering
2018-2025
University of Lisbon
2018-2025
Instituto Politécnico de Lisboa
2020
Rede de Química e Tecnologia
2020
Instituto Superior Técnico
2020
Here, we present new antimicrobial nanoparticles based on silica (SNPs) coated with a quaternary ammonium cationic surfactant, didodecyldimethylammonium bromide (DDAB). Depending the initial concentration of DDAB, SNPs immobilize between 45 and 275 μg DDAB per milligram nanoparticle. For high concentrations adsorbed to SNP, bilayer is formed as confirmed by zeta potential measurements, thermogravimetry, diffuse reflectance infrared Fourier transform (DRIFT) analyses. Interestingly, these...
We assembled a new electrospinning apparatus and used poly(ethylene oxide) as model polymer to perform systematic study on the influence of solution processing parameters morphology electrospun nanofibers. Solution studied were concentration molecular mass. The solvent used, 60 wt% water, 40 ethanol, was same throughout study. Processing analyzed were: feed rate, needle tip-collector distance electrostatic potential difference between collector. viscosity increased both with Polymer plays...
Cancer remains a leading cause of mortality and morbidity worldwide. Consequently, the scientific community continues to pursue improvements in diagnostic methods subsequent treatments. To enhance treatment efficacy reduce probability adverse outcomes, reliable sensitive are essential. A potential solution may lie synergy between nanotechnology optical biosensors, as they can provide exceptional sensitivity detection disease biomarkers. This review focuses on fluorescent DNA probes assembled...
Porphyrins are typically weak emitters, which presents challenges to their optical detection by single-molecule fluorescence microscopy. In this contribution, we explore the enhancement effect of gold nanodimer antennas on porphyrins in order enable detection. Four meso-substituted free-base were evaluated: two cationic, one neutral, and anionic porphyrin. The able enhance emission from these a factor 105–106 increase maximum detected photon rates. This extreme is due combination an antenna...
Conjugation of fluorescently-labelled DNA onto gold nanorods produces strongly emitting nano-assemblies, but only tip-selective functionalization affords an effective emission enhancement.
The surface plasmon modes of metal nanoparticles provide a way to efficiently enhance the excitation and emission from fluorescent dye. We have employed DNA-directed assembly prepare dimers gold used their longitudinally coupled mode fluorescence an organic red-emitting dye, Atto-655. plasmon-enhanced this dye using 80 nm particles was measured at single-molecule detection level. top enhancement factors were above 1000-fold in 71% within total 32 measured, some cases, they reached almost...
A simple method based on sucrose density gradient centrifugation is proposed here for the fractionation of colloidal silver nanotriangles. This afforded particle fractions with surface plasmon resonances, spanning from red to infrared spectral ranges that could be used tune optical properties plasmonic applications. feature was exemplified by selecting nanotriangle samples overlap Atto-655 dye's absorption and emission in order assemble dye-particle plasmophores. The brightness an individual...
Dual probe porphyrin-gold nanorod polyelectrolyte microcapsules were developed to explore the enhancing effects of a plasmonic interface self-assembled gold nanoparticles in fluorescence emission from porphyrins loaded into capsules’ core. An analysis lifetime imaging microscopy (FLIM) data reports notable 105–106-fold increase maximum detected photon rates diffraction-limited spots and an overall six-fold as averaged over whole microcapsule area. Large enhancements correlated with decreases...
We have employed DNA-directed assembly to prepare dimers of gold nanoparticles and used their longitudinally coupled plasmon mode enhance the fluorescence emission an organic red-emitting dye, Atto-655. The plasmon- enhanced this dye using 80 nm particles was measured at single molecule detection level. top enhancement factors were above 1000-fold in 71% within a total 32 measured, and, some cases, they reached almost 4000-fold, good agreement with model simulations. Additionally, lifetime...
<div> <p>We have employed DNA-directed assembly to prepare dimers of gold nanoparticles and used their longitudinally coupled plasmon mode enhance the fluorescence emission an organic red-emitting dye, Atto-655. The plasmon- enhanced this dye using 80 nm particles was measured at single molecule detection level. top enhancement factors were above 1000-fold in 71% within a total 32 measured, and, some cases, they reached almost 4000-fold, good agreement with model simulations....