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Infrared light

Radosław Mrówczyński, Artur Jędrzak, Kosma Szutkowski, Bartosz F Grześkowiak, Emerson Coy, Roksana Markiewicz, Teofil Jesionowski, Stefan Jurga
Polydopamine (PDA)-coated magnetic nanoparticles functionalized with mono-6-thio-β-cyclodextrin (SH-βCD) were obtained and characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), Nuclear and Magnetic Resonance Imaging (NMR and MRI), and doxorubicin (DOXO)-loading experiments. The liver cancer cellular internalization of DOXO-loaded nanoparticles was investigated by confocal imaging microscopy. Synthesized nanomaterials bearing a chemotherapeutic drug and a layer of polydopamine capable of absorbing near-infrared light show high performance in the combined chemo- and photothermal therapy (CT-PTT) of liver cancer due to the synergistic effect of both modalities as demonstrated in vitro...
March 16, 2018: Nanomaterials
A-Ra Hong, Youngsun Kim, Tae Sup Lee, Sehoon Kim, Kwangyeol Lee, Gayoung Kim, Ho Seong Jang
In this study, intense single-band red-emitting upconversion nanophosphors (UCNPs) excited with 800 nm near infrared (NIR) light are reported. When a NaYF4 :Nd,Yb active-shell is formed on the 12.7 nm-sized NaGdF4 :Yb,Ho,Ce UCNP core, the core/shell (C/S) UCNPs show tunable emission from green to red depending on the Ce3+ concentration under excitation with 800 nm NIR light. Thirty mol% Ce3+ -doped C/S UCNPs exhibit single-band red emission peaking at 644 nm via a5 F5 →5 I8 transition of Ho3+ . A high Nd3+ concentration in the shell results in strong absorption at around 800 nm NIR light even though the shell thickness is not large, and small-sized C/S UCNPs (16...
March 16, 2018: ACS Applied Materials & Interfaces
Ramūnas Aleksiejūnas, Žydrūnas Podlipskas, Saulius Nargelas, Arūnas Kadys, Marek Kolenda, Kazimieras Nomeika, Jūras Mickevičius, Gintautas Tamulaitis
Indium nitride has a good potential for infrared optoelectronics, yet it suffers from fast nonradiative recombination, the true origin of which has not been established with certainty. The diffusion length of free carriers at high densities is not well investigated either. Here, we study carrier recombination and diffusion using the light-induced transient grating technique in InN epilayers grown by pulsed MOCVD on c-plane sapphire. We show that direct Auger recombination governs the lifetime of carriers at densities above ~1018  cm-3 ...
March 15, 2018: Scientific Reports
Felista L Tansi, Ronny Rüger, Ansgar M Kollmeier, Markus Rabenhold, Frank Steiniger, Roland E Kontermann, Ulf K Teichgraeber, Alfred Fahr, Ingrid Hilger
BACKGROUND: Endoglin (CD105) is overexpressed on tumor cells and tumor vasculatures, making it a potential target for diagnostic imaging and therapy of different neoplasms. Therefore, studies on nanocarrier systems designed for endoglin-directed diagnostic and drug delivery purposes would expose the feasibility of targeting endoglin with therapeutics. METHODS: Liposomes carrying high concentrations of a near-infrared fluorescent dye in the aqueous interior were prepared by the lipid film hydration and extrusion procedure, then conjugated to single chain antibody fragments either selective for murine endoglin (termed mEnd-IL) or directed towards human endoglin (termed hEnd-IL)...
March 12, 2018: Biochimica et Biophysica Acta
Jiaqi Zhang, Zipeng Xing, Jiayi Cui, Zhenzi Li, Siyu Tan, Junwei Yin, Jinlong Zou, Qi Zhu, Wei Zhou
Herein, C,N co-doped porous TiO2 hollow sphere visible light photocatalysts were fabricated using biocompatible N-lauroyl-l-glutamic acid as a doped precursor and soft-template by a mild and facile self-assembly soft-template method, followed by calcination at 550 °C in air. The structure, morphology, and surface elemental composition were characterized in detail by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy...
March 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Lu Cai, Kaikai Du, Yurui Qu, Hao Luo, Meiyan Pan, Min Qiu, Qiang Li
Polar crystals can enable strong light-matter interaction at an infrared regime and provide many practical applications including thermal emission. However, the dynamic control of thermal emission based on polar crystals remains elusive as the lattice vibrations are solely determined by the crystal structure. Here, a nonvolatile tunable midinfrared thermal emitter enabled by a phase-changing film Ge2 Sb2 Te5 on silicon carbide polar crystal is demonstrated. By controlling the state of Ge2 Sb2 Te5 from an amorphous to a crystalline state, the emissivity of the thermal emitter is tuned from a low value to near unity with a maximum change in peak emissivity exceeding 10 dB over the Reststrahlen band of SiC (11...
March 15, 2018: Optics Letters
Bo-Jun Huang, Jun-Han Lin, H H Cheng, Guo-En Chang
We report GeSn p-i-n resonant-cavity-enhanced photodetectors (RCEPDs) grown on silicon-on-insulator substrates. A vertical cavity, composed of a buried oxide as the bottom reflector and a deposited SiO2 layer on the top surface as the top reflector, is created for the GeSn p-i-n structure to enhance the light-matter interaction. The responsivity experiments demonstrate that the photodetection range is extended to 1820 nm, completely covering all the telecommunication bands, because of the introduction of 2...
March 15, 2018: Optics Letters
Rai Kou, Taiki Hatakeyama, Jason Horng, Ji-Hun Kang, Yuan Wang, Xiang Zhang, Feng Wang
Mid-infrared light provides numerous unexpected opportunities in scientific discoveries because this wavelength region covers the fingerprints of various molecular vibrational resonances. However, the light generation efficiency and bandwidth have been a long-standing bottleneck which has limited the development so far. Moreover, the light source that can be integrated with other components such as wavelength filters, detectors, and electronics, will be the key factor toward the future practical applications...
March 15, 2018: Optics Letters
B Lakshmanna, N Jayaraju, T Lakshmi Prasad, G Sreenivasulu, K Nagalakshmi, M Pramod Kumar, M Madakka
X-ray diffraction (XRD), Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS), and Fourier Transform Infrared Spectroscopy (FT-IR), were applied to analyze the organic matrix of two Molluscan shells . The Mollusca shells are mineral structure and calcium carbonate crystallized as aragonite. The FT-IR spectra showed Alkyl Halide, Alkanes, Alcohols, Amides, Aromatic, and Hydroxyl groups in the organic matrix of the whole (organic and mineral) Molluscan shells. SEM images of particles of the two Molluscan shells at different magnifications were taken...
February 2018: Data in Brief
Shuhei Okuyama, Tadanobu Nagaya, Kazuhide Sato, Fusa Ogata, Yasuhiro Maruoka, Peter L Choyke, Hisataka Kobayashi
Near-infrared photoimmunotherapy (NIR-PIT), a promising cancer therapy utilizing an antibody-photoabsorber conjugate (APC) and NIR light, which induces rapid necrotic cell death only in APC-bound cells. Effective NIR-PIT in mouse models has been achieved using superficial light illumination (SLI) with light emitting diodes (LEDs) or lasers, but in the clinical setting, fiber optic diffusers have been employed to deliver light to deeper tumors. However, the performance of NIR light in tissue delivered by fiber optic diffusers is poorly understood...
February 16, 2018: Oncotarget
Yugal Kishore Mohanta, Debasis Nayak, Kunal Biswas, Sameer Kumar Singdevsachan, Elsayed Fathi Abd Allah, Abeer Hashem, Abdulaziz A Alqarawi, Dhananjay Yadav, Tapan Kumar Mohanta
The present study demonstrates an economical and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using the wild mushroom Ganoderma sessiliforme . The synthesis of AgNPs was confirmed and the products characterized by UV-visible spectroscopy, dynamic light scattering spectroscopy and X-ray diffraction analysis. Furthermore, Fourier transform infrared spectroscopy (ATR-FTIR) analysis was performed to identify the viable biomolecules involved in the capping and active stabilization of AgNPs...
March 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Yanpeng Zhu, Zeming Xia, Zeying Cai, Ziyong Yuan, Nianqiang Jiang, Tao Li, Yonggen Wang, Xiaoyu Guo, Zhihao Li, Shuang Ma, Dingyong Zhong, Yang Li, Jiaobing Wang
We report the synthesis and characterization of two hexapole [7]helicenes (H7Hs). Single crystal X-ray diffraction unambiguously confirms the molecular structure. H7H absorbs light, with distinct Cotton effect, from ultraviolet to the near infrared (λmax = 618 nm). Cyclic voltammetry reveals nine reversible redox states, consecutively from -2 to +6. These chiroptical and electronic properties of H7H are inaccessible from helicene's small homologues.
March 14, 2018: Journal of the American Chemical Society
Arisu Shigeta, Shota Ito, Rina Kaneko, Sahoko Tomida, Keiichi Inoue, Hideki Kandori, Izuru Kawamura
Krokinobacter rhodopsin 2 (KR2), a light-driven Na+ pump, is a dual-functional protein, pumping protons in the absence of Na+ when K+ or larger alkali metal ions are present. A specific mutation in helix A near the extracellular Na+ binding site, H30A, eliminates its proton pumping ability. We induced structural changes in H30A by altering the alkali metal ion bound at the extracellular binding site, and observed a strong electrostatic interaction between the Schiff base and counterion and torsion around the Schiff base as revealed by solid-state nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopies...
March 14, 2018: Physical Chemistry Chemical Physics: PCCP
Elham Karami Keshmarzi, R Niall Tait, Pierre Berini
Single-mode surface plasmon distributed feedback (DFB) lasers are realized in the near infrared using a two-dimensional non-uniform long-range surface plasmon polariton structure. The surface plasmon mode is excited onto a 20 nm-thick, 1 μm-wide metal stripe (Ag or Au) on a silica substrate, where the stripe is stepped in width periodically, forming a 1st order Bragg grating. Optical gain is provided by optically pumping a 450 nm-thick IR-140 doped PMMA layer as the top cladding, which covers the entire length of the Bragg grating, thus creating a DFB laser...
March 14, 2018: Nanoscale
Biki Gupta, Bijay Kumar Poudel, Shobha Regmi, Shiva Pathak, Hima Bindu Ruttala, Milan Gautam, Gyeong Jin An, Jee-Heon Jeong, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
PURPOSE: Lung cancer is the leading cause of cancer-related deaths. The aim of this study was to design solid lipid core nanocapsules (SLCN) comprising a solid lipid core and a PEGylated polymeric corona for paclitaxel (PTX) and erlotinib (ERL) co-delivery to non-small cell lung cancer (NSCLC), and evaluate their physicochemical characteristics and in vitro activity in NCI-H23 cells. METHODS: PTX/ERL-SLCN were prepared by nanoprecipitation and sonication and physicochemically characterized by dynamic light scattering, transmission electron microscopy, differential scanning calorimetry, X-ray diffraction, and Fourier-transform infrared spectroscopy...
March 13, 2018: Pharmaceutical Research
Thonimar Vieira Alencar, Driele von Dreifus, Maria Gabriela Cota Moreira, Gomes S N Eliel, Chao-Hui Yeh, Po-Wen Chiu, Marcos A Pimenta, Leandro Malard, Ana M de Paula
We report on photoluminescence emission imaging by femtosecond laser excitation on twisted bilayer graphene samples. The emission images are obtained by tuning the excitation laser energies in the near infrared region. We demonstrate an increase of the photoluminescence emission at excitation energies that depends on the bilayer twist angle. The results show a peak for the light emission when the excitation is in resonance with transitions at the van Hove singularities in the electronic density of states. We measured the photoluminescence excitation peak position and width for samples with various twist angles showing resonances in the energy range of 1...
March 13, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Ina Strauss, Alexander Mundstock, Dominik Hinrichs, Rasmus Himstedt, Alexander Knebel, Carsten Reinhardt, Dirk Dorfs, Jürgen Caro
Co-MOF-74 rod like crystals with a length of several hundred micrometers have been synthesized via a solvothermal procedure and their interaction with different gases has been evaluated in view of selective gas sensing. We show strongly anisotropic absorption behaviour of the Co-MOF-74 crystals when illuminated with polarized light. This study then addresses the interactions of guests (CO2, propane, propene, Ar, MeOH, H2O) with Co-MOF-74, studied by various spectroscopic techniques. Via Vis/NIR measurements, peak shifts of Co-MOF-74 depending on the interaction with the guest molecules were observed and distinguished...
March 13, 2018: Angewandte Chemie
Esra Metin, Pelin Mutlu, Ufuk Gunduz
BACKGROUND: Although conventional chemotherapy is the most common method for cancer treatment, it has several side effects such as neuropathy, alopecia and cardiotoxicity. Since the drugs are given to body systemically, normal cells are also affected, just like cancer cells. However, in recent years, targeted drug delivery has been developed to overcome these drawbacks. OBJECTIVE: The aim in this study was targeted co-delivery of doxorubicin (Dox) which is an anticancer agent and D-α-Tocopherol polyethylene glycol 1000 succinate (vitamin E TPGS or simply TPGS) to breast cancer cells...
March 13, 2018: Anti-cancer Agents in Medicinal Chemistry
Hanshuo Wu, Peng Wang, Jiaxin Song, Jun Ye, Jiangming Xu, Xiao Li, Pu Zhou
Random fiber laser, as a kind of novel fiber laser that utilizes random distributed feedback as well as Raman gain, has become a research focus owing to its advantages of wavelength flexibility, modeless property and output stability. Herein, a tunable optical parametric oscillator (OPO) enabled by a random fiber laser is reported for the first time. By exploiting a tunable random fiber laser to pump the OPO, the central wavelength of idler light can be continuously tuned from 3977.34 to 4059.65 nm with stable temporal average output power...
March 5, 2018: Optics Express
Huixu Deng, Cherian J Mathai, Shubhra Gangopadhyay, Jie Gao, Xiaodong Yang
Ultra-broadband strong absorption over 92% covering the infrared wavelength range of 1~6μm is demonstrated by using the tapered hyperbolic Au-SiO2 multilayer waveguides on glass substrates. Such broadband absorption is formed by the stop-light modes at various wavelengths located at different waveguide widths. A planar hyperbolic waveguide model is built to determine the stop-light modes by considering both forward and backward guided modes. The stop-light modes located inside the Au-SiO2 multilayer waveguide are simulated at the absorption peaks by reducing the Au loss...
March 5, 2018: Optics Express
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