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Infrared long

Hui Wu, Yuji Higaki, Shiki Nojima, Atsushi Takahara
The orientation and crystallization of regioregular poly(3-dodecylthiophene) (P3DDT) in different diameter nanopores were investigated. P3DDT nanowires were prepared by a melt-wetting nonporous alumina template with P3DDT melts. The microstructure of the nanowires was analyzed by micro-Fourier transform infrared spectroscopy, grazing incidence wide angle X-ray diffraction, and differential scanning calorimetry. Although Form I modification prevails in all the nanowires, Form I crystals decrease and Form II crystals increase as the pore diameter decreases...
June 26, 2017: Soft Matter
A Gallego, U Sezer, M Arndt, M Mayor
We explore the synthesis, characterization, neutral launch and vacuum ultraviolet ionization of massive perfluorinated-alkyl-capped nanoparticles. The presence of the ligand coating in solution is corroborated by Fourier transform infrared spectroscopy (FT-IR) and the particle size distribution is analyzed by transmission electron microscopy (TEM). Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry identifies perfluoralkyl coated silver nanoparticles as the most stable species among the materials studied here...
June 26, 2017: Nanoscale
Huilin Zhu, Jie Xu, Jiangxue Li, Hongjun Peng, Tingting Cai, Xinge Li, Shijing Wu, Wei Cao, Sailing He
BACKGROUND: Affective disorders (AD) have been conceptualized as neural network-level diseases. In this study, we utilized functional near infrared spectroscopy (fNIRS) to investigate the spontaneous hemodynamic activities in the prefrontal cortex (PFC) of the AD patients with or without medications. METHODS: 42 optical channels were applied to cover the superior frontal gyrus (SFG), middle frontal gyrus (MFG), and inferior frontal gyrus (IFG), which constitute one of the most important affective networks of the brain...
June 17, 2017: Journal of Affective Disorders
Dandan Chen, Qiong Li, Zihui Meng, Lei Guo, Ying Tang, Zhihe Liu, Shengyan Yin, Weiping Qin, Zhen Yuan, Xuanjun Zhang, Changfeng Wu
Stem cell therapy holds promise for treatment of intractable diseases and injured organs. For clinical translation, it is pivotal to understand the homing, engraftment, and differentiation processes of stem cells in a living body. Here we report near-infrared (NIR) fluorescent semiconductor polymer dots (Pdots) for bright labeling and tracking of human mesenchymal stem cells (MSCs). The Pdots exhibit narrow-band emission at 775 nm with a quantum yield of 22%, among the highest value for various NIR probes. The Pdots together with a cell penetrating peptide are able to track stem cells over two weeks without disturbing their multipotent properties, as confirmed by the analyses on cell proliferation, differentiation, stem-cell markers, and immunophenotyping...
2017: Theranostics
Tao Wan, Jingtong Pan, Yueming Long, Kaiyue Yu, Yixuan Wang, Wenhui Pan, Wenyi Ruan, Mengyao Qin, Chuanbin Wu, Yuehong Xu
In this study, we demonstrate for the first time the dual roles of Tocopheryl Polyethylene Glycol 1000 Succinate (TPGS) based microemulsion (ME) for tacrolimus (TAC) to enhance TAC percutaneous delivery and anti-psoriatic efficacy. The ME formulation was developed and optimized based on pseudo-ternary phase diagrams combined with in vitro permeation. The result of Fourier transform infrared spectroscopy (FTIR) demonstrated that TAC was completely solubilized in the TPGS-ME. In vitro permeation studies showed that TPGS-ME enhanced TAC permeation through and into the skin, and the enhanced deposition of TAC in the normal or psoriatic skin was further confirmed in vivo...
June 16, 2017: International Journal of Pharmaceutics
Hongbin Chen, Bin Zheng, Chao Liang, Li Zhao, Ying Zhang, Huizhuo Pan, Wanying Ji, Xiaoqun Gong, Hanjie Wang, Jin Chang
The photothermal therapy agents induced by 808 nm near infrared light laser have good potential for photothermal therapy (PTT) in vivo, with the advantages of harmless treatment, minimally invasion, high efficiency and deep tissue penetration. For the traditional photothermal therapy agents, however, it was impossible to track them in vivo because of the low signal-to-noise ratio, so we cannot conduct the extra near infrared light laser to radiate tumors sites accurately. Herein, we introduce a new complex: indocyanine green (ICG), near-infrared persistent luminescence (PL) phosphors ZnGa2O4:Cr(3+) (ZGC) and mesoporous silica nanoparticles (MSNs) (ICG@mZGC nanoparticles) were assembled for long-lasting optical imaging to guide PTT...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Hongguang Li, Rongfeng Lan, Chi-Fai Chan, Guochen Bao, Chen Xie, Pak-Ho Chu, William C S Tai, Shuai Zha, Jing-Xiang Zhang, Ka-Leung Wong
We report a direct imaging tool, HGEu001, for primary cilia in living cells, which is specific, and based on the UV light or near infrared laser (via two-photon excitation) induced long-lived europium luminescence.
June 19, 2017: Chemical Communications: Chem Comm
Elizabeth Gaona Colmán, María Belén Blanco, Ian Barnes, Peter Wiesen, Mariano Andrés Teruel
The O3-molecule initiated degradation of three 2-alkenals (E)-2-heptenal, (E)-2-octenal and (E)-2-nonenal has been investigated in a 1080 L quartz-glass environmental chamber at 298  2 K and atmospheric pressure of synthetic air using in situ FTIR spectroscopy to monitor the reactants and products. The experiments were performed in the absence of OH scavenger. The molar yields of the primary products formed were glyoxal (49 ± 4) % and pentanal (34 ± 3) % from the reaction of (E)-2-heptenal with O3, glyoxal (41 ± 3) % and hexanal (39 ± 3) % from the reaction of (E)-2-octenal with O3 and glyoxal (45 ± 3) % and heptanal (46 ± 3) % from the reaction of (E)-2-nonenal with O3...
June 16, 2017: Journal of Physical Chemistry. A
Tanja Ivanovska, Chiara Dionigi, Edoardo Mosconi, Filippo De Angelis, Fabiola Liscio, Vittorio Morandi, Giampiero Ruani
The long diffusion length of charge carriers in the CH3NH3PbI3 perovskite is one of the most relevant properties for explaining the high photovoltaic efficiency of perovskite solar cells. As a possible mechanism for the large diffusion length of electrons and holes, several authors suggested a reduced coulomb attraction of the carriers due to the formation of polarons. Here we performed continuous wave far-infrared photoinduced absorption (PIA) experiments on CH3NH3PbI3; spectral changes are associated with local deformation of the lattice around the photogenerated long-lived charges, a typical signature of photoinduced polarons...
June 22, 2017: Journal of Physical Chemistry Letters
Reema Railkar, L Spencer Krane, Q Quentin Li, Thomas Sanford, Mohammad Rashid Siddiqui, Diana Haines, Srinivas Vourganti, Sam J Brancato, Peter L Choyke, Hisataka Kobayashi, Piyush K Agarwal
The use of light as a means of therapy for bladder cancer (BC) has a long history but has been hampered by a lack of tumor specificity and therefore, damage to the normal bladder mucosa. Here, we describe a targeted form of photo-therapy called photoimmunotherapy (PIT) which targets EGFR-expressing BC. Anti-EGFR antibody panitumumab (pan) was labeled with the photo-absorber (PA), IRDye 700Dx (IR700), to create a pan IR700 antibody-PA conjugate which is activated by near-infrared radiation (NIR). BC tissue microarray (TMA) and BC cell lines were analyzed for expression of EGFR...
June 15, 2017: Molecular Cancer Therapeutics
Joy Hirsch, Xian Zhang, J Adam Noah, Yumie Ono
Human eye-to-eye contact is a primary source of social cues and communication. In spite of the biological significance of this interpersonal interaction, the underlying neural processes are not well-understood. This knowledge gap, in part, reflects limitations of conventional neuroimaging methods, including solitary confinement in the bore of a scanner and minimal tolerance of head movement that constrain investigations of natural, two-person interactions. However, these limitations are substantially resolved by recent technical developments in functional near-infrared spectroscopy (fNIRS), a non-invasive spectral absorbance technique that detects changes in blood oxygen levels in the brain by using surface-mounted optical sensors...
June 12, 2017: NeuroImage
Takao Kuwada-Kusunose, Alisa Kusunose, Masanobu Wakami, Chikako Takebayashi, Haruhiko Goto, Masahiro Aida, Takeshi Sakai, Keisuke Nakao, Kyoko Nogami, Manabu Inagaki, Ken Hayakawa, Kunihiro Suzuki, Toshiro Sakae
In the application of lasers in dentistry, there is a delicate balance between the benefits gained from laser treatment and the heat-related damage arising from laser irradiation. Hence, it is necessary to understand the different processes associated with the irradiation of lasers on dental materials. To obtain insight for the development of a safe and general-purpose laser for dentistry, the present study examines the physical effects associated with the irradiation of a near-infrared free-electron laser (FEL) on the surface of a commonly used silver dental alloy...
June 14, 2017: Lasers in Medical Science
Félix Ezequiel Fernández Suárez, David Fernández Del Valle, Adrián González Alvarez, Blanca Pérez-Lozano
The total circulatory arrest (CA) is necessary to achieve optimal surgical conditions in certain aortic pathologies, especially in those affecting the ascending aorta and aortic arch. During this procedure it is necessary to protect all the organs of ischemia, especially those of the central nervous system and for this purpose several strategies have been developed. The first and most important protective method is systemic hypothermia. The degree of hypothermia and the route of application have been evolving and currently tend to use moderate hypothermia (MH) (20...
May 2017: Journal of Thoracic Disease
Anand Bahl, Vinay Pramod Majety, Armin Scrinzi, Miroslav Kolesik
Using first-principle multi-electron calculations via the hybrid anti-symmetrized coupled channels method, we create a model to describe both the nonlinear polarization and ionization of the nitrogen molecule. Based on the metastable electronic state approach, it is designed for space-and-time-resolved simulations in nonlinear optics that require modeling of optical pulses that exhibit rich spectral dynamics and propagate over long distances. As a demonstration of the model's utility, we study low-order harmonic generation in mid-infrared optical filaments...
June 15, 2017: Optics Letters
Dorina F Sava Gallis, Lauren E Shea-Rohwer, Mark A Rodriguez, Meghan C Barnhart-Dailey, Kimberly S Butler, Ting S Luk, Jerilyn A Timlin, Karena W Chapman
Herein we describe a novel multifunctional metal-organic framework (MOF) materials platform that displays both porosity and tunable emission properties as a function of the metal identity (Eu, Nd, and tuned compositions of Nd/Yb). Their emission collectively spans the deep red to near-infrared (NIR) spectral region (~ 614 - 1350 nm), which is highly relevant for in vivo bio-imaging. These new materials meet important prerequisites as relevant to biological processes: they are minimally toxic to living cells, and retain structural integrity in water and phosphate buffered saline...
June 14, 2017: ACS Applied Materials & Interfaces
Abbas Haddadi, Arash Dehzangi, Romain Chevallier, Sourav Adhikary, Manijeh Razeghi
Type-II superlattices (T2SLs) are a class of artificial semiconductors that have demonstrated themselves as a viable candidate to compete with the state-of-the-art mercury-cadmium-telluride material system in the field of infrared detection and imaging. Within type-II superlattices, InAs/InAs1-xSbx T2SLs have been shown to have a significantly longer minority carrier lifetime. However, demonstration of high-performance dual-band photodetectors based on InAs/InAs1-xSbx T2SLs in the long and very long wavelength infrared (LWIR & VLWIR) regimes remains challenging...
June 13, 2017: Scientific Reports
Jin-Lei Li, Jun-Peng Shi, Cheng-Cheng Wang, Peng-Hui Li, Zhen-Feng Yu, Hong-Wu Zhang
Until now, the afterglow emissions of most developed near infrared (NIR)-emitting persistent luminescent nanoparticles (NPLNPs) were located at approximately 700 nm, at the edge of the first tissue transparency window (from 650 to 900 nm), which resulted in relatively low tissue penetration and signal-to-noise ratio (SNR) for in vivo imaging. Herein, 5 nm ZnSn2O4:Cr,Eu (ZSO) NPLNPs with NIR afterglow emission at 800 nm are synthesized via a direct aqueous-phase synthesis method. The longer NIR afterglow emission of ZSO NPLNPs can easily penetrate approximately 3 cm of pork tissue...
June 13, 2017: Nanoscale
Li-Jian Chen, Cheng-Xiong Yang, Xiu-Ping Yan
Near-infrared persistent luminescence nanoparticles (NIR-PLNPs) are promising imaging agents due to deep tissue penetration, high signal-to-noise ratio, and repeatedly charging ability. Here, we report liposome-coated NIR-PLNPs (Lipo-PLNPs) as a novel persistent luminescence imaging guided drug carrier for chemotherapy. The Lipo-PLNP nanocomposite shows the advantages of superior persistent luminescence and high drug loading efficiency and enables autofluorescence-free and long-term tracking of drug delivery carriers with remarkable therapeutic effect...
June 15, 2017: Analytical Chemistry
Zhenluan Xue, Xiaolong Li, Youbin Li, Mingyang Jiang, Hongrong Liu, Songjun Zeng, Jianhua Hao
Near-infrared (NIR) persistent luminescence nanoparticles (PLNPs) are considered as new alternative optical probes due to being free of autofluorescence, benefited from the self-sustained emission after excitation and high signal-to-noise ratio. However, the NIR-emitted PLNPs always present a short decay time and require excitation by ultraviolet or visible light with a short penetrable depth, remarkably hindering their applications for in vivo long-term tracking and imaging. Therefore, it is important to develop NIR-emitted PLNPs with in vivo activation nature by new excitation sources with deeper penetrating depths...
June 26, 2017: ACS Applied Materials & Interfaces
A Levet, J Colombani, L Duponchel
Due to the willingness to extend the nuclear power plants length of life, it is of prime importance to understand long term ageing effect on all constitutive materials. For this purpose gamma-irradiation effects on insulation of instrumentation and control cables are studied. Mid-infrared spectroscopy and principal components analysis (PCA) were used to highlight molecular modifications induced by gamma-irradiation under oxidizing conditions. In order to be closer to real world conditions, a low dose rate of 11Gyh(-1) was used to irradiate insulations in full cable or alone with a dose up to 58 kGy...
September 1, 2017: Talanta
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