Article
Physics, Condensed Matter
Amit Kumar Naiya
Summary: This study analyzed the dielectric spectra of polycrystalline Sr0.98Mn0.02TiO3 under different perturbing electric fields cooled under various magnetic fields, identifying two relaxations caused by reorientation of Mn-Sr(2+) dipoles.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Bushra Khan, Manoj K. Singh, Aditya Kumar, Arushi Pandey, Sushmita Dwivedi, Upendra Kumar, Surbhi Ramawat, Sumit Kukreti, Ambesh Dixit, Somnath C. Roy
Summary: KBiFe2O5 (KBFO) is a multiferroic compound with a narrow band gap, synthesized using sol-gel technique and characterized by XRD, SEM, UV visible spectroscopy, electrical, magnetic, and impedance spectroscopy analyses. The results confirm the multiferroic behavior, weak ferromagnetic nature, negative magneto-dielectric coupling, and strong MD coupling in KBFO, making it a promising candidate for room-temperature multiferroicity with potential for photovoltaic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Kosmas Vamvakidis, Nikolaos Maniotis, Catherine Dendrinou-Samara
Summary: In this study, a series of magneto-fluorescent nanocomposites were synthesized and optimized through experimental and theoretical studies. The inclusion of an orange-emitting platinum complex was confirmed by spectroscopic techniques, and a theoretical model based on linear response theory was developed to analyze the composites' power losses. Theoretical estimations on optimal concentration and size were validated by experimental data, demonstrating the potential for nanotheranostic applications.
Article
Engineering, Chemical
Sheng Liu, Yujuan Guo, Shunmin Yi, Shijing Yan, Chaoliu Ouyang, Fei Deng, Chunxue Li, Guangfu Liao, Qing Li
Summary: Ultrafine Ag nanoparticles with an average size of approximately 4.37 nm were decorated on the surface of pure silicon zeolite nanoparticles and confined in pore channels through an in-situ reduction strategy. The prepared Ag/PSZN nanocomposites showed ultrahigh catalytic activity for the reduction of 4-nitrophenol and methylene blue, surpassing previously reported Ag-based catalysts. The excellent catalytic performance was attributed to the large loading amount and ultrasmall size of Ag nanoparticles, providing abundant active sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Pedro U. Munoz-Gonzalez, J. M. Flores-Moreno, Irais A. Quintero-Ortega, Diego Mantovani, Birzabith Mendoza-Novelo, Gerardo Gonzalez-Garcia
Summary: This study reports a simple method for synthesizing silicon nanoparticles (SiNps) dispersed in water. The SiNps exhibit small size, good structure, and fluorescence, making them suitable as cell fluorescent trackers. Furthermore, the SiNps show cytocompatibility and exert an anti-inflammatory effect on macrophages, suggesting their potential as immunomodulatory biomaterials.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Ceramics
Yellanna Machakanti, K. Chandra Babu Naidu, D. Baba Basha, Chandrasekhar Madunuri, N. Suresh Kumar, A. Ratnamala, Anish Khan
Summary: This study investigates the microstructure and magneto-dielectric properties of Ni(1-x)EuxFe(2)O(4) (x = .02-.08) nanoparticles prepared by low-temperature hydrothermal method. The results demonstrate that the lattice constants and particle size of NEF increase with the increase of Eu-content. The NEF exhibits hysteresis behavior under varying magnetic field, and the magnetization is highest for x = .08. The TG-DSC analysis reveals the mass loss and transition temperatures of NEF.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Martina Foschi, Paola Capasso, Maria Anna Maggi, Fabrizio Ruggieri, Giulia Fioravanti
Summary: This study investigated the removal of triazines from water using pristine graphene oxide and its thermally reduced derivatives, rGO. The reduction process was optimized through experiments, and the results showed that rGO could effectively adsorb pollutants through hydrogen bonds and pi-pi interactions. The adsorption behavior of different triazines was slightly different, with rGO demonstrating a favorable adsorption capacity.
Article
Chemistry, Physical
A. Aslinjensipriya, R. Sylvia Reena, R. Ragu, S. Grace Infantiya, G. Mangalam, C. Justin Raj, S. Jerome Das
Summary: Transition metal oxide nanoparticles, especially nickel oxide (NiO), have attracted significant interest due to their size-dependent properties and unique progress in optical, electrochemical, and magnetic characteristics. In this study, undoped and tin (Sn) doped nickel oxide nanoparticles were successfully synthesized using a citrate assisted sol-gel technique. The nanoparticles were extensively investigated for their structural, optical, and magnetic properties. The results showed that the dopant concentration had a significant effect on the crystallite size, strain, and optical energy band gap of the nanoparticles. The surface morphology and grain size of the nanoparticles were confirmed by scanning electron microscopy and transmission electron microscopy analyses. The magnetic parameters of the nanoparticles were evaluated using vibrating sample magnetometer measurements, and two critical magnetic parameters were extracted. The highest coercivity was observed in the sample with 6% Sn doping. Furthermore, the potential application of the synthesized nanoparticles in antibiotics-independent antimicrobial activity was discussed.
SURFACES AND INTERFACES
(2022)
Article
Multidisciplinary Sciences
Shulamit Edelstein, Antonio Garcia-Martin, Pedro A. Serena, Manuel Marques
Summary: This paper demonstrates the formation of near-field stable optical binding between two identical plasmonic particles induced by an incident plane wave, showing the conditions and characteristics of stable binding. By considering the magneto-optical effect, the binding distance can be further manipulated. The proposed binding method is validated through molecular dynamics simulations.
SCIENTIFIC REPORTS
(2021)
Article
Polymer Science
Stefan Hardon, Jozef Kudelcik, Anton Baran, Ondrej Michal, Pavel Trnka, Jaroslav Hornak
Summary: In this study, nanoparticles of Al2O3 and ZnO were dispersed into a polyesterimide (PEI) matrix to prepare nanocomposite polymer. The influence of nanoparticle fillers on the complex relative permittivity was studied using dielectric frequency spectroscopy. The presence of nanoparticles in the resin changed the segmental dynamics of the polymer chain and charge distribution, resulting in higher polymer chain mobility and a shift of relaxation peaks in the spectra.
Article
Optics
Ronja Koethemann, Christian Golla, Hong Qu, Cedrik Meier
Summary: This study investigates the influence of gold nanoantennas on the photoluminescence signal of silicon nanocrystals. By integrating gold nanoantennas into a layered system containing silicon nanocrystals, the photoluminescence signal can be manipulated in terms of attenuation or enhancement. Additionally, the impact of grating coupling and the number of antennas per antenna array on the amplification of the photoluminescence signal is examined.
Article
Materials Science, Composites
L. A. M. Al-Sagheer, A. Rajeh
Summary: Solid polymer electrolytes with NiFe2O4 nanoparticles and PVA/CMC films were prepared to enhance their structural, optical, dielectric, conductivity, and magnetic characteristics. The blend polymer matrix showed increased amorphousness and ionic conductivity with the addition of NiFe2O4 nanoparticles. The dopant concentration significantly affected the optical energy band gap and electrical conductivity of the pure CMC/PVA, with higher loading showing more pronounced effects.
POLYMER COMPOSITES
(2023)
Article
Mathematics, Applied
Jishan Fan, Tohru Ozawa
Summary: In this paper, the Banach fixed point theorem is used to prove the uniform-in-epsilon existence of the compressible full magneto-micropolar system in a bounded smooth domain, where epsilon is the dielectric constant. Consequently, the limit as epsilon -> 0 can be established. This approximation, known as the magnetohydrodynamics approximation, neglects the displacement current.
Article
Materials Science, Multidisciplinary
Arunima Rajan, Beata Kaczmarek-Szczepanskac, Niroj Kumar Sahu
Summary: In this study, iron oxide nanoparticles with high crystallinity and hydrophilicity were synthesized, showing improved specific loss power in hyperthermia tests. The nanoparticles exhibited concentration-dependent effects with anticancer activity towards cancer cells and biocompatibility towards normal cells. Additionally, minimal damage to erythrocyte membrane was induced by the nanoparticles.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Multidisciplinary
D. Garcia-Gonzalez, M. A. Moreno, L. Valencia, A. Arias, D. Velasco
Summary: Magneto-active polymers (MAPs) filled with magnetic particles demonstrate mechanical responses under external magnetic fields, with potential applications in various fields. This study focuses on the mechanical characterization of MAPs constituted by PDMS filled with CIP particles and presents a nonlinear constitutive model that considers dependencies. The model provides theoretical guidance for magneto-active systems, especially in the realm of epithelial wound healing stimulation.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Optics
Javier Gonzalez-Colsa, Guillermo Serrera, Jose Maria Saiz, Dolores Ortiz, Francisco Gonzalez, Fernando Bresme, Fernando Moreno, Pablo Albella
Summary: This study compares the thermoplasmonic response of different nanoparticle geometries and finds that doughnut-shaped nanoparticles have a superior tunable photothermal response under practical illumination conditions. The heating of nanoparticles in fluidic environments strongly depends on the particle orientation with respect to the illumination source. It is concluded that nanodoughnuts are the best nanoheaters with weak dependence on orientation, making them ideal for photothermal therapy applications.
Article
Materials Science, Multidisciplinary
Yael Gutierrez, Andrea Fernandez-Perez, Saul A. Rosales, Cornel Cobianu, Marin Gheorghe, Mircea Modreanu, Jose M. Saiz, Fernando Moreno, Maria Losurdo
Summary: In this study, imaging polarimetry and spectroscopic ellipsometry were used to reveal and directly measure the optical properties of Sb(2)S(3) in crystalline and amorphous states. The results show that Sb(2)S(3) crystallites exhibit strong anisotropy and low losses, while the amorphous films are optically isotropic.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Angela Barreda, Chengjun Zou, Artem Sinelnik, Evgenii Menshikov, Ivan Sinev, Thomas Pertsch, Isabelle Staude
Summary: This study proposes the use of phase change materials to tune the properties of light-emitting metasurfaces designed to support quasi-bound states in the continuum. Numerical simulations demonstrate the different functionalities of the metasurface depending on the selected phase change material. The research provides concrete design blueprints for switchable metasurfaces, offering new opportunities for nanophotonics devices or integrated photonic circuits.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Gonzalo Santos, Marin Georghe, Cornel Cobianu, Mircea Modreanu, Maria Losurdo, Yael Gutierrez, Fernando Moreno
Summary: This paper presents a reconfigurable photodetector based on a metal-semiconductor configuration, utilizing hot-carrier and surface plasmons (SPs) hot-electron injection into semiconductors for narrowband photoresponse and sub-bandgap energy photodetection. By numerically studying the parameters of the dual-comb Au electrodes and the SP order, the absorption of the device is optimized, enabling tunable narrowband photodetection from the O telecom band to the C telecom band.
Article
Optics
N. Abbasirad, A. Barreda, D. Arslan, M. Steinert, Y-J Chen, J-S Huang, I Staude, F. Setzpfandt, T. Pertsch
Summary: Point source excitation and point detection in the near-field provide a new perspective for studying the optical phenomena of plasmonic nanostructures. Using automated dual-tip scanning near-field optical microscopy, the optical near-field response of a dipolar emission near the edge of a monocrystalline gold platelet was measured, and near-field enhancement was observed.
Article
Physics, Applied
Angela Barreda, Laura Mercade, Mario Zapata-Herrera, Javier Aizpurua, Alejandro Martinez
Summary: In this paper, a new hybrid photonic-plasmonic cavity configuration is proposed, which combines a silicon photonic crystal cavity with a gold nanoparticle to achieve high Q factors and small mode volumes at telecom wavelengths, resulting in extremely large Purcell-factor values. The proposed cavity could have various applications.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Analytical
Maria Carcelen, Veronica Vidal, Alfredo Franco, Marcos Gomez, Fernando Moreno, Jose L. Fernandez-Luna
Summary: This article introduces a simple, fast and label-free method based on a gold nanohole array biosensor to detect the spectral response and changes in cell-matrix adhesion of cancer cells. The experimental results show that this biosensor can effectively distinguish different cell populations in the cell cycle and detect changes in cell-matrix interaction in real time.
Article
Chemistry, Analytical
Begona Ruiz, Enrique Fuente, Alejandro Perez, Luis Taboada-Ruiz, Juan Marcos Sanz, Luis Fernando Calvo, Sergio Paniagua
Summary: The textile industry is highly polluting, generating millions of tons of waste annually. This study focused on the energy potential of three types of industrial textile waste: CW, SFW, and W, using conventional and flash pyrolysis at different temperatures. The results showed that bio-oil yields were highest in low-temperature flash pyrolysis and conventional pyrolysis, with the highest heating value obtained from SFW waste. The bio-oils obtained contained aromatic and non-aromatic compounds, with high levels of phenols and benzenes in low-temperature pyrolysis and polycyclic aromatic hydrocarbons in high-temperature pyrolysis.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Optics
Daniel Repp, Angela Barreda, Francesco Vitale, Isabelle Staude, Ulf Peschel, Carsten Ronning, Thomas Pertsch
Summary: Semiconductor nanowire lasers can have their lasing threshold modified by their environment, and using metallic substrates can access low-volume Surface-Plasmon-Polariton (SPP) modes and describe mode competition in nanowire lasers. The study found that an aluminum substrate decreases the lasing threshold for ZnO nanowire lasers, while a silver substrate increases the threshold compared to a dielectric substrate. These findings allow for predictions about the interaction between planar metals and semiconductor nanowires, guiding future improvements in highly-integrated laser sources.
Article
Chemistry, Multidisciplinary
Gonzalo Santos, Maria Losurdo, Fernando Moreno, Yael Gutierrez
Summary: All-dielectric metasurfaces are nanopatterned structures that have various applications and their optical behavior is determined by composition, dimensions, and environment. However, their functionality is fixed during fabrication, limiting their potential as reconfigurable devices. A reconfigurable all-dielectric metasurface based on high refractive index materials is proposed, which can control scattered light through phase-change chalcogenide antimony triselenide. The device consists of a 2D array of sandwich disks embedded in a SiO2 matrix.
Article
Nanoscience & Nanotechnology
Evelyn Diaz-Escobar, Angela I. Barreda, Laura Mercade, Amadeu Griol, Alessandro Pitanti, Alejandro Martinez
Summary: Far-field scattering of high-index nanoparticles can be greatly reduced via interference of multipolar moments, resulting in anapole states. We analyze the light transmission along chains of regular and slotted silicon disks in the frequency region over the light cone. Transmission is not observed at wavelengths corresponding to the excitation of the first electric anapole for regular disks, but large transmission is observed for slotted disks due to the excitation of toroidal dipole and magnetic quadrupole modes. Our results provide new insights into the role of radiationless states in light guidance along nanoparticle chains.
Article
Chemistry, Multidisciplinary
Athira Kuppadakkath, Angela Barreda, Lilit Ghazaryan, Tobias Bucher, Kirill Koshelev, Thomas Pertsch, Adriana Szeghalmi, Duk Choi, Isabelle Staude, Falk Eilenberger
Summary: The resonance wavelength of metasurfaces can be tailored by applying heat, reducing the precision required for manufacturing. In our experiment with an a-Si:H metasurface, quasi-bound states in the continuum (quasi-BIC) resonance wavelength were permanently adjusted with gradual heating. The spectral shift observed was a result of refractive index variations in the material rather than geometric effects or phase transitions.
Article
Chemistry, Analytical
Victor Garcia-Milan, Alfredo Franco, Margarita Estreya Zvezdanova, Sara Marcos, Ruben Martin-Laez, Fernando Moreno, Carlos Velasquez, Jose L. Fernandez-Luna
Summary: A nanostructured gold biosensor was used to distinguish between tumor tissue and peritumoral tissue in GBM patients based on differences in their optical properties. The biosensor showed a high sensitivity and specificity in discriminating between the two tissues, making it a potential tool for real-time intraoperative discrimination.
Article
Materials Science, Multidisciplinary
Yael Gutierrez, Gonzalo Santos, Fabio Palumbo, Mircea Modreanu, Fernando Moreno, Maria Losurdo
Summary: In this study, the reversible non-volatile transition of molybdenum oxides was experimentally demonstrated, and its optical properties were investigated. The research results highlight the potential applicability of molybdenum oxides in metal-insulator transitions.
OPTICAL MATERIALS EXPRESS
(2022)
Review
Materials Science, Multidisciplinary
Angela Barreda, Francesco Vitale, Alexander E. Minovich, Carsten Ronning, Isabelle Staude
Summary: Hybrid metal-dielectric nanostructures have shown superior performance in enhancing light-matter interactions, combining strong confinement and high scattering efficiency. They have various applications in sensing, spectroscopy enhancement, solar energy harvesting, etc.
ADVANCED PHOTONICS RESEARCH
(2022)
