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https://www.readbyqxmd.com/read/28717583/in-vivo-photothermal-treatment-with-real-time-monitoring-by-optical-fiber-needle-array
#1
Taeseok Daniel Yang, Kwanjun Park, Hyung-Jin Kim, Nu-Ri Im, Byoungjae Kim, TaeHoon Kim, Sohyun Seo, Jae-Seung Lee, Beop-Min Kim, Youngwoon Choi, Seung-Kuk Baek
Photothermal treatment (PTT) using gold nanoshells (gold-NSs) is accepted as a method for treating cancer. However, owing to restrictions in therapeutic depth and skin damage caused by excessive light exposure, its application has been limited to lesions close to the epidermis. Here, we demonstrate an in vivo PTT method that uses gold-NSs with a flexible optical fiber-needle array (OFNA), which is an array of multiple needles in which multimode optical fibers are inserted, one in each, for light delivery. The light for PTT was directly administrated to subcutaneous tissues through the OFNA, causing negligible thermal damage to the skin...
July 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28697194/enhancing-contrast-agents-and-radiotracers-performance-through-hyaluronic-acid-coating-in-neuroradiology-and-nuclear-medicine
#2
Mario Ganau, Nikolaos Ch Syrmos, Felice D'Arco, Laura Ganau, Salvatore Chibbaro, Lara Prisco, Gianfranco K I Ligarotti, Rossano Ambu, Andrea Soddu
The use of hyaluronic acid nanoshells has been proposed to encapsulate prodrugs and exploit the mechanisms of interactions between living cells, like endocytes or cancer cells and hyaluronic acid, which is a natural component of the extracellular matrix. In this review we describe the potential and the limits of this promising research trend and discuss the theoretical advantages of such an engineering approach. Is it a possible scalability to increase the efficacy and biodegradability of molecules like contrast media and radiotracers especially for neuroradiology and nuclear medicine studies...
July 12, 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28695942/gold-silver-alloy-semi-nanoshell-arrays-for-label-free-plasmonic-biosensors
#3
Valentina Russo, Niccolo' Michieli, Tiziana Cesca, Carlo Scian, Davide Silvestri, Margherita Morpurgo, Giovanni Mattei
Nanosphere lithography coupled with reactive ion etching has been used to synthesize hexagonal ordered arrays of Au-Ag bimetallic semi-nanoshells to be used as plasmonic biosensors. The degree of lateral interaction between adjacent semi-nanoshells can be controlled by tailoring the reactive ion etching time in order to boost the global plasmonic properties through the formation of near-field hot-spots, which in turn can improve the sensitivity of the biosensors. To test the efficiency of the proposed system as a biosensor, we used an established protocol for the detection of biomolecules (local sensitivity), based on the receptor-ligand approach and using the biotin-streptavidin model system...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28682465/a-comparative-study-of-clinical-intervention-and-interventional-photothermal-therapy-for-pancreatic-cancer
#4
Yanyan Hu, Chongwei Chi, Shunhao Wang, Lingxiong Wang, Ping Liang, Fangyi Liu, Wenting Shang, Weiwei Wang, Fengrong Zhang, Shanshan Li, Heyun Shen, Xiaoling Yu, Huiyu Liu, Jie Tian
Although nanoparticle-based photothermal therapy (PTT) has been intensively investigated recently, its comparative efficiency with any clinical cancer treatments has been rarely explored. Herein for the first time we report a systematic comparative study of clinical iodine-125 ((125) I) interstitial brachytherapy (IBT-125-I) and interventional PTT (IPTT) in an orthotopic xenograft model of human pancreatic cancer. IPTT, based on the nanoparticles composing of anti-urokinase plasminogen activator receptor (uPAR) antibody, polyethylene glycol (PEG), and indocyanine green (ICG) modified gold nanoshells (hereinafter uIGNs), is directly applied to local pancreatic tumor deep in the abdomen...
July 6, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28645629/production-and-characterization-of-aluminium-oxide-nanoshells-on-spray-dried-lactose
#5
Joel Hellrup, Mårten Rooth, Anders Johansson, Denny Mahlin
Atomic layer deposition (ALD) enables deposition of dense nanometer thick metal oxide nanoshells on powder particles with precise thickness control. This leads to products with low weight fraction coating, also when depositing on nano- or micron sized powder particles. This study aimed at investigating the aluminium oxide nanoshell thickness required to prevent moisture sorption. The nanoshells were produced with ALD on spray-dried lactose, which is amorphous and extremely hygroscopic. The particles were studied with dynamic vapor sorption between 0 and 50% RH, light scattering, scanning electron microscopy, X-ray diffraction, differential scanning calorimetry, and polarized light microscopy...
June 20, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28629209/fabrication-of-nanoshell-based-3d-periodic-structures-by-templating-process-using-solution-derived-zno
#6
Shinji Araki, Yasuaki Ishikawa, Xudongfang Wang, Mutsunori Uenuma, Donghwi Cho, Seokwoo Jeon, Yukiharu Uraoka
Fabrication methods for a 3D periodic nanostructure with excellent and unique properties for various applications, such as photonic and phononic crystals, have attracted considerable interest. Templating processes using colloidal crystals have been proposed to create nanoshell-based 3D structures over a large area with ease. However, there are technical limitations in structural design, resulting in difficulties for structural flexibility. Here, we demonstrate a combination of proximity field nanopatterning and infiltration processes using solution-derived ZnO for a nanoshell-based 3D periodic structure with high structural flexibility and controllability...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28623305/enhanced-optical-properties-of-zno-and-ceo2-coated-zno-nanostructures-achieved-via-spherical-nanoshells-growth-on-a-polystyrene-template
#7
Asmaa Eltayeb, Stephen Daniels, Enda McGlynn
In this paper, ZnO, CeO2 and CeO2-coated ZnO nanostructures were synthesised by simple and efficient low temperature wet chemical methods on Si (100) and quartz substrates. The ZnO films were prepared by a drop coating deposition method. This was then combined with a thin layer of the redox active material CeO2 to form CeO2-coated ZnO films. Spherical ZnO nanoshell structures and CeO2-coated ZnO nanoshells have been prepared using polystyrene (PS) sphere monolayer templates. The structural properties and morphologies of the nanostructures were analysed by x-ray diffraction (XRD) and scanning electron microscopy (SEM)...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28616953/universal-liquid-phase-laser-fabrication-of-various-nano-metals-encapsulated-by-ultrathin-carbon-shells-for-deep-uv-plasmonics
#8
Miao Yu, Chao Yang, Xiao-Ming Li, Tian-Yu Lei, Hao-Xuan Sun, Li-Ping Dai, Yu Gu, Xue Ning, Ting Zhou, Chao Wang, Hai-Bo Zeng, Jie Xiong
The exploration of localized surface plasmon resonance (LSPR) beyond the usual visible waveband, for example within the ultraviolet (UV) or deep-ultraviolet (D-UV) regions, is of great significance due to its unique applications in secret communications and optics. However, it is still challenging to universally synthesize the corresponding metal nanostructures due to their high activity. Herein, we report a universal, eco-friendly, facile and rapid synthesis of various nano-metals encapsulated by ultrathin carbon shells, significantly with a remarkable deep-UV LSPR characteristic, via a liquid-phase laser fabrication method...
June 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/28608835/highly-sensitive-magnetic-sers-dual-function-silica-nanoprobes-for-effective-on-site-organic-chemical-detection
#9
Cheolhwan Jeong, Hyung-Mo Kim, So Yeon Park, Myeong Geun Cha, Sung-Jun Park, San Kyeong, Xuan-Hung Pham, Eunil Hahm, Yuna Ha, Dae Hong Jeong, Bong-Hyun Jun, Yoon-Sik Lee
We report magnetic silver nanoshells (M-AgNSs) that have both magnetic and SERS properties for SERS-based detection. The M-AgNSs are composed of hundreds of Fe₃O₄ nanoparticles for rapid accumulation and bumpy silver shell for sensitive SERS detection by near-infrared laser excitation. The intensity of the SERS signal from the M-AgNSs was strong enough to provide single particle-level detection. We obtained much stronger SERS signal intensity from the aggregated M-AgNSs than from the non-aggregated AgNSs...
June 13, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28605594/rational-design-of-branched-nanoporous-gold-nanoshells-with-enhanced-physico-optical-properties-for-optical-imaging-and-cancer-therapy
#10
Jibin Song, Xiangyu Yang, Zhen Yang, Lisen Lin, Yijing Liu, Zijian Zhou, Zheyu Shen, Guocan Yu, Yunlu Dai, Orit Jacobson, Jeeva Munasinghe, Bryant Yung, Gao-Jun Teng, Xiaoyuan Chen
Reported procedures on the synthesis of gold nanoshells with smooth surfaces have merely demonstrated efficient control of shell thickness and particle size, yet no branch and nanoporous features on the nanoshell have been implemented to date. Herein, we demonstrate the ability to control the roughness and nanoscale porosity of gold nanoshells by using redox-active polymer poly(vinylphenol)-b-(styrene) nanoparticles as reducing agent and template. The porosity and size of the branches on this branched nanoporous gold nanoshell (BAuNSP) material can be facilely adjusted by control of the reaction speed or the reaction time between the redox-active polymer nanoparticles and gold ions (Au(3+))...
June 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28594160/spontaneous-pt-deposition-on-defective-surfaces-of-in2o3-nanocrystals-confined-within-cavities-of-hollow-silica-nanoshells-pt-catalyst-modified-ito-electrode-with-enhanced-ecl-performance
#11
Young Shin Cho, Soo Min Kim, Youngwon Ju, Junghoon Kim, Ki-Wan Jeon, Seung Hwan Cho, Joohoon Kim, In Su Lee
Although the deposition of metallic domains on a preformed semiconductor nanocrystal provides an effective pathway to access diverse hybrid nanocrystals with synergistic metal/semiconductor heterojunction interface, those reactions that take place on the surface of semiconductor nanoscrystals have not been investigated thoroughly, because of the impediments caused by the surface-capping organic surfactants. By exploiting the interfacial reactions occurring between the solution and nanoparticles confined with the cavities of hollow nanoparticles, we propose a novel nanospace-confined strategy for assessing the innate reactivity of surfaces of inorganic semiconductor nanoparticles...
June 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28590253/when-lithography-meets-self-assembly-a-review-of-recent-advances-in-the-directed-assembly-of-complex-metal-nanostructures-on-planar-and-textured-surfaces
#12
Robert Hughes, Eredzhep Menumerov, Svetlana Neretina
One of the foremost challenges in nanofabrication is the establishment of a processing science that integrates wafer-based materials, techniques, and devices with the extraordinary physicochemical properties accessible when materials are reduced to nanoscale dimensions. Such a merger would allow for exacting controls on nanostructure positioning, promote cooperative phenomenon between adjacent nanostructures and/or substrate materials, and allow for electrical contact to individual or groups of nanostructures...
June 7, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28581001/structure-and-elasticity-of-composite-nanoparticle-polymer-nanoshells-hybridosomes%C3%A2
#13
F Sciortino, M Thivolle, M L Kahn, C Gaillard, S Chevance, F Gauffre
Our group recently introduced a new process to synthesize nanoparticle shells of about 100 nm, named "hybridosomes®". Here, the structure and mechanical properties of hybridosomes® made from iron oxide nanoparticles and poly(acrylic acid) are characterized using TEM, AFM and an osmotic compression technique. For the latter, the size distribution of the hybridosomes is monitored by nanoparticle tracking analysis (NTA) in the presence of poly(ethylene glycol)s of different molecular weights. It is found that the size of the hybridosomes® can be tuned from ca...
June 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/28580098/hollow-carbon-nanobubbles-monocrystalline-mof-nanobubbles-and-their-pyrolysis
#14
Wei Zhang, Xiangfen Jiang, Yanyi Zhao, Arnau Carné-Sánchez, Victor Malgras, Jeonghun Kim, Jung Ho Kim, Shaobin Wang, Jian Liu, Ji-Sen Jiang, Yusuke Yamauchi, Ming Hu
While bulk-sized metal-organic frameworks (MOFs) face limits to their utilization in various research fields such as energy storage applications, nanoarchitectonics is believed to be a possible solution. It is highly challenging to realize MOF nanobubbles with monocrystalline frameworks. By a spatially controlled etching approach, here, we can achieve the synthesis of zeolitic imidazolate framework (ZIF-8) nanobubbles with a uniform size of less than 100 nm. Interestingly, the ZIF-8 nanobubbles possess a monocrystalline nanoshell with a thickness of around 10 nm...
May 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28551145/a-magnetic-polypyrrole-iron-oxide-core-gold-shell-nanocomposite-for-multimodal-imaging-and-photothermal-cancer-therapy
#15
Lu Han, Yang Zhang, Yue Zhang, Yang Shu, Xu-Wei Chen, Jian-Hua Wang
For the purpose of improving the diagnosis and enhancing the photothermal therapeutic effect for cancer under near-infrared (NIR) laser irradiation, a novel magnetic therapeutic platform containing dual photothermal agents, polypyrrole (PPy) and gold nanoshell, is constructed. The nanostructure is composed of a magnetic PPy/Fe3O4-core and a gold nanoshell, which is capable of enhancing the contrast for both magnetic resonance (MR) and X-ray computed tomography (CT) imaging. By attaching Raman probes onto the surface of gold shell, the nanocomposites exhibit the potential to serve as surface-enhanced Raman scattering (SERS) active substrates for optical modality identification of cancer cell...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28544579/frizzled7-antibody-functionalized-nanoshells-enable-multivalent-binding-for-wnt-signaling-inhibition-in-triple-negative-breast-cancer-cells
#16
Rachel S Riley, Emily S Day
Antibodies that antagonize cell signaling pathways specific to their targeted receptor are invaluable tools to study and treat malignancies, but their utility is limited by high production costs and treatment dosages. Researchers have shown that antibodies conjugated to nanoparticles display increased affinity for their target relative to freely delivered antibodies due to multivalency, and this study investigates how this multivalency can enable antibody-nanoparticle conjugates to inhibit oncogenic cell signaling more effectively than freely delivered antibodies...
July 2017: Small
https://www.readbyqxmd.com/read/28542311/18f-fdg-pet-ct-based-early-treatment-response-evaluation-of-nanoparticle-assisted-photothermal-cancer-therapy
#17
Kamilla Norregaard, Jesper T Jørgensen, Marina Simón, Fredrik Melander, Lotte K Kristensen, Pól M Bendix, Thomas L Andresen, Lene B Oddershede, Andreas Kjaer
Within the field of nanoparticle-assisted photothermal cancer therapy, focus has mostly been on developing novel heat-generating nanoparticles with the right optical and dimensional properties. Comparison and evaluation of their performance in tumor-bearing animals are commonly assessed by changes in tumor volume; however, this is usually a late-occurring event. This study implements 2-deoxy-2-[F-18]fluoro-D-glucose positron emission tomography imaging to perform early evaluation of the treatment outcome of photothermal therapy...
2017: PloS One
https://www.readbyqxmd.com/read/28539851/the-influence-of-particle-size-distribution-and-shell-imperfections-on-the-plasmon-resonance-of-au-and-ag-nanoshells
#18
Daniel Mann, Daniel Nascimento-Duplat, Helmut Keul, Martin Möller, Marcel Verheijen, Man Xu, H Paul Urbach, Aurèle J L Adam, Pascal Buskens
Au and Ag nanoshells are of interest for a wide range of applications. The plasmon resonance of such nanoshells is the property of interest and can be tuned in a broad spectral regime, ranging from the ultraviolet to the mid-infrared. To date, a large number of manuscripts have been published on the optics of such nanoshells. Few of these, however, address the effect of particle size distribution and metal shell imperfections on the plasmon resonance. Both are inherent to the chemical synthesis of metal nanoshells and therefore to a large extent unavoidable...
2017: Plasmonics
https://www.readbyqxmd.com/read/28535356/one-dimensional-carrier-confinement-in-giant-cds-cdse-excitonic-nanoshells
#19
Natalia Razgoniaeva, Pavel Moroz, Mingrui Yang, Darya S Budkina, Holly Eckard, Marissa Augspurger, Dmitriy Khon, Alexander N Tarnovsky, Mikhail Zamkov
The emerging generation of quantum dot optoelectronic devices offers an appealing prospect of a size-tunable band gap. The confinement-enabled control over electronic properties, however, requires nanoparticles to be sufficiently small, which leads to a large area of interparticle boundaries in a film. Such interfaces lead to a high density of surface traps which ultimately increase the electrical resistance of a solid. To address this issue, we have developed an inverse energy-gradient core/shell architecture supporting the quantum confinement in nanoparticles larger than the exciton Bohr radius...
June 5, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28534394/sonochemical-synthesis-of-a-zinc-oxide-core-shell-nanorod-radial-p-n-homojunction-ultraviolet-photodetector
#20
Phani Kiran Vabbina, Raju Sinha, Arash Ahmadivand, Mustafa Karabiyik, Burak Gerislioglu, Osama Awadallah, Nezih Pala
We report for the first time on the growth of a homogeneous radial p-n junction in the ZnO core-shell configuration with a p-doped ZnO nanoshell structure grown around a high-quality unintentionally n-doped ZnO nanorod using sonochemistry. The simultaneous decomposition of phosphorous (P), zinc (Zn), and oxygen (O) from their respective precursors during sonication allows for the successful incorporation of P atoms into the ZnO lattice. The as-formed p-n junction shows a rectifying current-voltage characteristic that is consistent with a p-n junction with a threshold voltage of 1...
May 31, 2017: ACS Applied Materials & Interfaces
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