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https://www.readbyqxmd.com/read/28088668/near-infrared-light-triggered-drug-delivery-system-for-higher-efficacy-of-combined-chemo-photothermal-treatment
#1
Yi Chen, Haohuan Li, Yueyang Deng, Haifeng Sun, Xue Ke, Tianyuan Ci
: The combination of chemotherapy and photothermal therapy is a promising strategy for cancer treatment. In the present study, indocyanine green (ICG), a widely used near-infrared (NIR) dye in photothermal therapy, and chemotherapeutic drug-doxorubicin (DOX) were loaded within the nanoparticles of novel designed arylboronic ester and cholesterol modified hyaluronic acid (PPE-Chol1-HA), denoted as PCH-DI. We take advantage of reactive oxygen species (ROS) production capability of ICG and ROS-sensitivity of arylboronic ester to realize controllable drug release...
January 11, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28088116/upconversion-color-tuning-in-ce-3-doped-liyf4-yb-3-ho-3-liyf4-nanoparticles-towards-ratiometric-fluorescence-detection-of-chromium-iii
#2
Shijiang Liu, Yangjie Li, Cheng Zhang, Liang Yang, Tingting Zhao, Ruilong Zhang, Changlong Jiang
Ratiometric fluorescence sensor exhibits advantages of sensitive response, high anti-interference ability and naked eye visualization owing to multiple independent emission peaks utilized for results analysis. To achieve such multi-emission probe, the traditional methods have involved simple mixing of two emitters or tedious synthesis processes of hybrid material. However, these probes often have problems of inconstant emission strength ratio, low light-stability, and complicated synthetic process, which limit their applications in practical field...
January 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28088104/biofabrication-of-size-controllable-silver-nanoparticles-a-green-approach
#3
Sireesh Babu Maddinedi, Badal Kumar Mandal, Swetha Kameswari Maddili
A facile biosynthetic approach for the size controllable production of silver nanoparticles (AgNPs) using the leaf extract of Cinnamomum tsoi as reducing and capping agent is developed. The polyphenolic functionalities present in the extract are essentially responsible for the synthesis and stabilization of AgNPs. The size and morphology of the AgNPs were effectively tuned by changing the volume of the extract. The availability of oxidized polyphenols play key role in tuning the size and morphology of the prepared NPs...
January 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28088081/lead-pb-2-and-copper-cu-2-remediation-from-water-using-superparamagnetic-maghemite-%C3%AE-fe2o3-nanoparticles-synthesized-by-flame-spray-pyrolysis-fsp
#4
Shalini Rajput, Lok P Singh, Charles U Pittman, Dinesh Mohan
Superparamagnetic maghemite (γ-Fe2O3) nanoparticles of controllable morphology were successfully synthesized using a flame spray pyrolysis (FSP) technique. Their physico-chemical properties, size, morphology, and surface chemistries were determined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), selected area electron diffraction patterns (SAED), SEM-EDX, scanning electron microscopy (SEM), and pHZPC(6.3). Elemental contents before and after adsorption were identified using energy dispersive X-ray fluorescence (ED-XRF), energy dispersive X-ray analysis (EDX) and elemental mapping...
November 27, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28087479/synthesis-and-characterization-of-gold-nanostructured-chorin-e6-for-photodynamic-therapy
#5
L Vieira, M L Castilho, I Ferreira, J Ferreira-Strixino, K C Hewitt, L Raniero
Photodynamic therapy is an alternative treatment for cancer based on cellular uptake of a photosensitizer, illuminated with an appropriate wavelength in the presence of oxygen. A cascade of reactions generates reactive oxygen species leading to cell death. Using carbodiimide chemistry, chlorin e6 (Ce6) was covalently bonded to thiourea, and (via the sulphur end group) to gold nanoparticles (AuNPs), forming the Ce6-AuNP complex. Ce6 absorbs in the range 650-680nm, where the coefficient of biological tissue absorption is low (part of the therapeutic window), which is ideal for biological application...
January 10, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28081076/spatially-resolved-individual-particle-spectroscopy-using-photothermal-modulation-of-mie-scattering
#6
R M Sullenberger, S M Redmond, D Crompton, A M Stolyarov, W D Herzog
We report a photothermal modulation of Mie scattering (PMMS) method that enables concurrent spatial and spectral discrimination of individual micron-sized particles. This approach provides a direct measurement of the "fingerprint" infrared absorption spectrum with the spatial resolution of visible light. Trace quantities (tens of picograms) of material were deposited onto an infrared-transparent substrate and simultaneously illuminated by a wavelength-tunable intensity-modulated quantum cascade pump laser and a continuous-wave 532 nm probe laser...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28081007/electronic-structure-of-alcrn-films-investigated-using-various-photoelectron-spectroscopies-and-ab-initio-calculations
#7
N Tatemizo, S Imada, Y Miura, H Yamane, K Tanaka
The valence band (VB) structures of wurtzite AlCrN (Cr concentration: 0-17.1%), which show optical absorption in the ultraviolet-visible-infrared light region, were investigated via photoelectron yield spectroscopy (PYS), x-ray/ultraviolet photoelectron spectroscopy (XPS/UPS), and ab initio density of states (DOS) calculations. An obvious photoelectron emission threshold was observed ~5.3 eV from the vacuum level for AlCrN, whereas no emission was observed for AlN in the PYS spectra. Comparisons of XPS and UPS VB spectra and the calculated DOS imply that Cr 3d states are formed both at the top of the VB and in the AlN gap...
January 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28079971/au-la2-ti2-o7-nanostructures-sensitized-with-black-phosphorous-for-plasmon-enhanced-photocatalytic-hydrogen-production-in-visible-and-near-infrared-light
#8
Mingshan Zhu, Xiaoyan Cai, Mamoru Fujitsuka, Junying Zhang, Tetsuro Majima
Efficient utilization of solar energy is a high-priority target and the search for suitable materials as photocatalysts that not only can harvest the broad wavelength of solar light, from UV to near-infrared (NIR) region, but also can achieve high and efficient solar-to-hydrogen conversion is one of the most challenging missions. Herein, using Au/La2 Ti2 O7 (BP-Au/LTO) sensitized with black phosphorus (BP), a broadband solar response photocatalyst was designed and used as efficient photocatalyst for H2 production...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28075120/femtosecond-study-of-dimolybdenum-paddlewheel-compounds-with-amide-thioamide-ligands-symmetry-electronic-structure-and-charge-distribution-in-the-1-mlct-s1-state
#9
Changcheng Jiang, Philip J Young, Samantha Brown-Xu, Judith C Gallucci, Malcolm H Chisholm
Four photophysically interesting dimolybdenum paddlewheel compounds are synthesized and characterized: I and II contain amide ligand (N,3-diphenyl-2-propynamide), and III and IV contain thioamide ligand (N,3-diphenyl-2-propynethioamide). I and III are trans-Mo2L2(O2C-T(i)PB)2-type compounds, and II and IV are Mo2L4-type compounds, where O2C-T(i)PB is 2,4,6-triisopropylbenzoate. I-IV display strong light absorption due to metal to ligand charge transfer (MLCT) transitions from molybdenum to the amide/thioamide ligands...
January 11, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28075022/the-mechanistic-basis-for-photobiomodulation-therapy-of-neuropathic-pain-by-near-infrared-laser-light
#10
Vanessa Milanesi Holanda, Maria Cristina Chavantes, Xingjia Wu, Juanita J Anders
BACKGROUND AND OBJECTIVE: Various irradiances have been reported to be beneficial for the treatment of neuropathic pain with near infrared light. However, the mechanistic basis for the beneficial outcomes may vary based on the level of irradiance or fluence rate used. Using in vivo and in vitro experimental models, this study determined the mechanistic basis of photobiomodulation therapy (PBMT) for the treatment of neuropathic pain using a high irradiance. STUDY DESIGN/MATERIALS AND METHODS: In vitro experiments: Cultured, rat DRG were randomly assigned to control or laser treatment (LT) groups with different irradiation times (2, 5, 30, 60, or 120 seconds)...
January 11, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28074961/tunable-electrical-properties-of-multilayer-hfse2-field-effect-transistors-by-oxygen-plasma-treatment
#11
Moonshik Kang, Servin Rathi, Inyeal Lee, Lijun Li, Muhammad Atif Khan, Dongsuk Lim, Yoontae Lee, Jinwoo Park, Sun Jin Yun, Doo-Hyeb Youn, Chungsam Jun, Gil-Ho Kim
HfSe2 field effect transistors are systematically studied in order to selectively tune their electrical properties by optimizing layer thickness and oxygen plasma treatment. The optimized plasma-treated HfSe2 field effect transistors showed a high on/off ratio improvement of four orders of magnitude, from 27 to 10(5), a field effect mobility increase from 2.16 to 3.04 cm(2) V(-1) s(-1), a subthreshold swing improvement from 30.6 to 4.8 V dec(-1), and a positive threshold voltage shift between depletion mode and enhancement mode, from -7...
January 11, 2017: Nanoscale
https://www.readbyqxmd.com/read/28072546/three-dimensional-integration-of-black-phosphorus-photodetector-with-silicon-photonics-and-nanoplasmonics
#12
Che Chen, Nathan Youngblood, Ruoming Peng, Daehan Yoo, Daniel A Mohr, Timothy W Johnson, Sang-Hyun Oh, Mo Li
We demonstrate the integration of black phosphorus photodetector in a hybrid, three-dimensional architecture of silicon photonics and metallic nanoplasmonics structures. This integration approach combines the advantages of low propagation loss of silicon waveguides, high field confinement of a plasmonic nanogap, and the narrow bandgap of black phosphorus to achieve high responsivity for detection of telecom-band near-infrared light. Benefitting from an ultrashort channel (~60 nm) and near-field enhancement enabled by the nanogap structure, the photodetector shows an intrinsic responsivity as high as 10 A/W afforded by internal gain mechanisms, and a 3 dB roll-off frequency of 150 MHz...
January 10, 2017: Nano Letters
https://www.readbyqxmd.com/read/28071899/near-ir-absorbing-gold-nanoframes-with-enhanced-physiological-stability-and-improved-biocompatibility-for-in-vivo-biomedical-applications
#13
Liying Wang, Yunching Chen, Hsin Yao Lin, Yung-Te Hou, Ling-Chu Yang, Aileen Y Sun, Jia-Yu Liu, Chien-Wen Chang, Dehui Wan
This paper describes the synthesis of near-infrared (NIR)-absorbing gold nanoframes (GNFs) and a systematic study comparing their physiological stability and biocompatibility with those of hollow Au-Ag nanoshells (GNSs), which have been used widely as photothermal agents in biomedical applications because of their localized surface plasmon resonance (LSPR) in the NIR region. The GNFs were synthesized in three steps: galvanic replacement, Au deposition, and Ag dealloying, using silver nanospheres (SNP) as the starting material...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28071852/environmental-and-excitation-power-effects-on-the-ratiometric-upconversion-luminescence-based-temperature-sensing-using-nanocrystalline-nayf4-yb3-er3
#14
Iko Hyppänen, Niina Perälä, Riikka Arppe, Michael Schäferling, Tero Soukka
The luminescence intensity ratio (LIR) of the green emissions of the near-infrared excited NaYF4:Yb3+,Er3+ nanocrystals is a promising method for temperature sensing. Here, the influence of excitation power density, excitation pulse length, excitation wavelength, silica shell, and solvent on the LIR and its temperature response is reported. Primary objective is to study the LIR mechanism and the impact of measurement and environmental parameters on the calibration and precision of the LIR. The LIR value is demonstrated to be unaffected by the excitation intensity in the studied range...
January 10, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28070927/lead-sulfide-selenide-quantum-dots-and-gold-copper-alloy-nanoparticles-augment-light-harvesting-of-solar-cells
#15
Aparajita Das, Melepurath Deepa, Partha Ghosal
Lead-sulfide-selenide (PbSSe) quantum dots (QDs) and gold-copper (AuCu) alloy nanoparticles (NPs) are incorporated in a cadmium sulfide (CdS)/titanium oxide (TiO2) photoanode for the first time for enhanced conversion of solar energy to electricity. PbSSe QDs with a band gap of 1.02 eV, extend the light harvesting range of the photoanode from visible to the near infrared region. The conduction band (CB) edge of PbSSe QDs is wedged between the CBs of TiO2 and CdS; this additional level coupled with a good electrical conductivity of the dots facilitate charge transport and collection, for a high power conversion efficiency (PCE) of 4...
January 10, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28069501/photothermal-and-biodegradable-polyaniline-porous-silicon-hybrid-nanocomposites-as-drug-carriers-for-combined-chemo-photothermal-therapy-of-cancer
#16
Bing Xia, Bin Wang, Jisen Shi, Yu Zhang, Qi Zhang, Zhenyu Chen, Jiachen Li
: To develop photothermal and biodegradable nanocarriers for combined chemo-photothermal therapy of cancer, polyaniline/porous silicon hybrid nanocomposites had been successfully fabricated via surface initiated polymerization of aniline onto porous silicon nanoparticles in our experiments. As-prepared polyaniline/porous silicon nanocomposites could be well dispersed in aqueous solution without any extra hydrophilic surface coatings, and showed a robust phototherml effect under near-infrared (NIR) laser irradiation...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28069225/sonochemical-assisted-hydrothermal-synthesis-of-pseudo-flower-shaped-bismuth-vanadate-bivo4-and-their-solar-driven-water-splitting-application
#17
Ibrahim Khan, Shahid Ali, Muhammad Mansha, Ahsanulhaq Qurashi
Bismuth vanadate (BiVO4) is a well-known photocatalyst due to its lower bandgap (Eg) and visible electromagnetic light absorption capacity. Herein, we reported the pulse ultra-sonochemical assisted hydrothermal approach to synthesize S-BiVO4. For the comparison purpose, H-BiVO4 is also synthesized via conventional hydrothermal approach. The surface morphology of S-BiVO4 through scanning electron microscope (SEM) indicates condensed microarrays (MAs) having pseudo-flower shapes. The energy dispersive X-rays (EDX) spectrum also confirmed the elemental percent composition of Bi, V and O in BiVO4...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069217/facile-high-yield-ultrasound-mediated-protocol-for-zno-hierarchical-structures-synthesis-formation-mechanism-optical-and-photocatalytic-properties
#18
Oana Carp, Alina Tirsoaga, Ramona Ene, Adelina Ianculescu, Raluca F Negrea, Paul Chesler, Gabriela Ionita, Ruxandra Birjega
Hierarchical flowers-like zinc oxide structures have been successfully obtained by a simple and fast ultrasound-assisted method performed in a ordinary ultrasonic bath using an ammonia solution and zinc acetate, in the absence of any surfactant or template. The composition, structure, crystallinity, morphology and optical properties of the materials obtained at different ultrasound irradiation times were characterized by infrared, UV-Vis and photoluminescence spectroscopy, X-ray diffraction, scanning and transmission electron microscopy investigations...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068066/gold-nanospheres-stabilized-indocyanine-green-as-a-synchronous-photodynamic-photothermal-therapy-platform-that-inhibits-tumor-growth-and-metastasis
#19
Wei Li, Hanbo Zhang, Xiaomeng Guo, Zuhua Wang, Fenfen Kong, Lihua Luo, Qingpo Li, Chunqi Zhu, Jie Yang, Yan Lou, Yong-Zhong Du, Jian You
Both photothermal therapy (PTT) and photodynamic therapy (PDT) are phototherapeutic approaches, which have been widely investigated for cancer therapy mediated by external light source. Here, a nanosystem presenting synchronous PTT and PDT effect realized through one-step near infrared (NIR) light irradiation is reported. This system was fabricated by conjugating indocyanine green (ICG) on hollow gold nanospheres (HAuNS) using branched-polyethylenimine (PEI, MW=10 kDa) as optimal linker, which provided a high ICG payload as well as a covering layer with suitable thickness on HAuNS to maintain ICG fluorescence and reactive oxygen species (ROS) productivity...
January 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28067928/near-infrared-light-mediated-enhancement-of-reactive-oxygen-species-generation-through-electron-transfer-from-graphene-oxide-to-iron-hydroxide-oxide
#20
Yue He, Andrea Del Valle, Yu Qian, Yu-Fen Huang
Clinical applications of current photodynamic therapy (PDT) agents are often restricted to be activated only by UV and visible light, which have very poor tissue penetration depths. In this study, a new near infrared (NIR)-absorbing nanoagent based on graphene oxide decorated with iron hydroxide/oxide (GO-FeOxH) was developed for light-activated nanomaterial-mediated PDT. This nanocomposite, GO-FeOxH was prepared via the one-step electrooxidation of iron nails in an aqueous GO solution. The as-prepared GO-FeOxH showed a much higher reactive oxygen species (ROS) activity under NIR light irradiation than GO...
January 9, 2017: Nanoscale
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