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Magnetic Separation in Integrated Micro-Analytical Systems
Published in Nguyễn T. K. Thanh, Clinical Applications of Magnetic Nanoparticles, 2018
Noble metal nanoparticles are known to demonstrate a size- and shape-dependent absorption spectrum. This absorption spectrum results from localized surface plasmon resonance, which is oscillation of electrons at the metal–air interface induced by light. Different colours of metal nanoparticles have long been used to colour-stained glass. Localized surface plasmon resonance has been studied for applications in optical markers for biomedical imaging and sensing. They have been used for labelling of cancer cells. El-Sayed et al.26 used gold nanoparticles (average size: 35 nm) functionalized with antiepidermal growth factor receptor (EGFR) antibodies to label nonmalignant (HaCaT) and malignant (HOC 313 and HSC 3) epithelial cells. It is possible to coat the surface of magnetic nanoparticles with gold to add the similar optical characteristics.
Harvesting Solar Energy: Fundamentals and Applications
Published in Prasenjit Mondal, Ajay K. Dalai, Sustainable Utilization of Natural Resources, 2017
Syed Shaheer Uddin Ahmed, Sayedus Salehin, Md. Mustafizur Rahman, A. K. M. Sadrul Islam
Nanofluid is a colloidal mixture of nanoparticles, usually metals or metal oxides, in a base fluid, with enhanced thermo-physical property, as compared with the base fluid. This type of fluid can be used in solar thermal energy applications for its enhanced heat-transfer property, along with the rheological properties. The experimental results presented in Arthur et al. show enhancement in thermo-physical and rheological properties, for example, specific heat, thermal conductivity, and viscosity of different molten salt nanofluids that are used in solar thermal energy systems (Arthur and Karim, 2016). The effect of gold nanoparticles in nanofluids has been investigated by Chen et al. for enhancing photothermal conversion in direct solar absorption solar collector. Localized surface plasmon resonance effect enhances the solar light absorption in gold nanoparticles as compared with the base fluids (Chen et al. 2016).
In Vivo Biodetection Using Surface-Enhanced Raman Spectroscopy
Published in Li Jun, Wu Nianqiang, Biosensors Based on Nanomaterials and Nanodevices, 2017
Lee Seunghyun, S. Kadam Ulhas, Craig Ana Paula, Irudayaraj Joseph
When a surface plasmon is confined to a metal nanoparticle with a size equal to the subwavelength of light, nonpropagating excitation of the free electrons on the surface of the nanoparticle in the oscillating electromagnetic fields gives rise to localized surface plasmon resonance (LSPR) (Hutter and Fendler 2004). LSPR results in strong optical extinction, which can be tuned throughout the visible and near-infrared (NIR) wavelengths by adjusting the particle′s size and shape (Oldenburg et al. 1998; Link et al. 1999; Lu et al. 2009).
Perovskite solar cells: importance, challenges, and plasmonic enhancement
Published in International Journal of Green Energy, 2020
Moshsin Ijaz, Aleena Shoukat, Asma Ayub, Huma Tabassum, Hira Naseer, Rabia Tanveer, Atif Islam, Tahir Iqbal
Localized surface plasmons originate when the light interacts with a metal nanostructure. The light that interacts with the metal nanostructures has a large wavelength compared to nanostructures, this gives rise to plasmon oscillation around nanostructure(Ijaz et al. 2020; Iqbal et al. 2020). Another kind of plasmon called surface wave plasmon, which is also called bounded plasma in which the waves that re guided by plasma sustain it(Popov Oleg 1995). Absorption and light scattering by surface plasmons is governed by Mie theory (Mie 1908). Plasmon modes can easily be explained through hybridization theory for nanostructures. (Prodan et al. 2003). Light scattering is a technique to study the internal structure of matter such as plasma by illuminating with EM radiations to which the matter is completely transparent. The radiations emitted in this case are due to the interaction between incident radiation and the free electrons in plasma. The angular distribution of the scattered radiation provides information about electron density. Measuring light scattering enables us to get dynamic understanding of plasma without destroying it. (Evans and Katzenstein 1969)
Applications and challenges of elemental sulfur, nanosulfur, polymeric sulfur, sulfur composites, and plasmonic nanostructures
Published in Critical Reviews in Environmental Science and Technology, 2019
Yong Teng, Qixing Zhou, Peng Gao
The near-infrared localized surface plasmon resonances of nanocrystals were affected by the size, shape, crystal phase, and reaction conditions (Zhu et al., 2015, 2016). A red-shift was observed due to the changes of the crystal phase, morphology, and dodecanethiol (DDT) post-treatment (Zhu et al., 2016). For a given size, there exist obvious surface-dependent shift for the plasmonic behavior of spherical nanocrystals (Zhu et al., 2015). The increasing amount of absorption and scattering due to the increasing particle size will contribute to the optical extinction. It is found that the resonance peak will shift from 400 nm to 800 nm with the size of a sphere from 10 to 90 nm (Murray & Barnes, 2007; Kelf et al., 2006). In addition, most organic molecules have a higher refractive index than buffer solution, but when they bind to nanoparticles, the local refractive index increases, causing the extinction and scattering spectrum to redshift (Zia et al., 2006).
Minreview: Recent advances in the development of gaseous and dissolved oxygen sensors
Published in Instrumentation Science & Technology, 2019
Q. Wang, Jia-Ming Zhang, Shuai Li
Although the Winkler method has many limitations, the advantage of high precision is unique. Therefore, some studies tried to improve the method. In 2016, a modified Winkler’s method was proposed by Zhang et al.[40] A mixed solution of manganese chloride (MnCl2) and potassium iodide/sodium hydroxide (KI/NaOH) was added into water samples. The mixed solution was added to a glycine/hydrogen chloride buffer solution containing cetyltrimethyl ammonium bromide (CTAB) and potassium iodide. Gold nanoparticles were subsequently added as an indicator. The produced iodine then etches the gold nanoparticles in the presence of cetyltrimethyl ammonium bromide and results in a blue shift of the longitudinal localized surface plasmon resonance (LSPR) absorption of gold nanoparticles. The shift of longitudinal localized surface plasmon resonance was used for quantification.