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https://www.readbyqxmd.com/read/28820223/a-dual-modal-silver-bumpy-nanoprobe-for-photoacoustic-imaging-and-sers-multiplexed-identification-of-in-vivo-lymph-nodes
#1
Myeong Geun Cha, Seunghyun Lee, Sungjo Park, Homan Kang, Sung Gun Lee, Cheolhwan Jeong, Yoon-Sik Lee, Chulhong Kim, Dae Hong Jeong
Multimodal imaging can provide complementary biomedical information which has huge potential in pre-clinical and clinical imaging and sensing. In this study, we introduce dual modal NIR silver bumpy nanoprobes for in vivo imaging and multiplexed detection of biomolecules by both photoacoustic imaging (PAI) and surface-enhanced Raman scattering (SERS) techniques. For this study, we used silica-coated silver bumpy nanoshell probes (AgNS@SiO2). AgNS@SiO2 have strong NIR-absorption and scattering properties compared with other nanostructures, and therefore, can be a good candidate for photoacoustic (PA) and SERS multimodal imaging...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28811657/colorimetric-fingerprints-of-gold-nanorods-for-discriminating-catecholamine-neurotransmitters-in-urine-samples
#2
Somayeh Jafarinejad, Mahmoud Ghazi-Khansari, Forough Ghasemi, Pezhman Sasanpour, M Reza Hormozi-Nezhad
Catecholamine neurotransmitters, generally including dopamine (DA), epinephrine (EP) and norepinephrine (NE) are known as substantial indicators of various neurological diseases. Simultaneous detection of these compounds and their metabolites is highly recommended in early clinical diagnosis. To this aim, in the present contribution, a high performance colorimetric sensor array has been proposed for the detection and discrimination of catecholamines based on their reducing ability to deposit silver on the surface of gold nanorods (AuNRs)...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28790311/plasmonic-silver-nanoshells-for-drug-and-metabolite-detection
#3
Lin Huang, Jingjing Wan, Xiang Wei, Yu Liu, Jingyi Huang, Xuming Sun, Ru Zhang, Deepanjali D Gurav, Vadanasundari Vedarethinam, Yan Li, Ruoping Chen, Kun Qian
In-vitro metabolite and drug detection rely on designed materials-based analytical platforms, which are universally used in biomedical research and clinical practice. However, metabolic analysis in bio-samples needs tedious sample preparation, due to the sample complexity and low molecular abundance. A further challenge is to construct diagnostic tools. Herein, we developed a platform using silver nanoshells. We synthesized SiO2@Ag with tunable shell structures by multi-cycled silver mirror reactions. Optimized nanoshells achieved direct laser desorption/ionization mass spectrometry in 0...
August 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28783216/sensitive-quantitative-naked-eye-biodetection-with-polyhedral-cu-nanoshells
#4
Jae-Ho Kim, Jeong-Eun Park, Mouhong Lin, Sungi Kim, Gyeong-Hwan Kim, SungJun Park, GwangPyo Ko, Jwa-Min Nam
One of the most heavily used methods in chemical and biological labeling, detection, and imaging is based on silver shell-based enhancement on Au nanoparticles (AuNPs) that is useful for amplifying Rayleigh scattering, colorimetric signal, surface-enhanced Raman scattering, and electrical signal, but poor structural controllability and nonspecific growth of silver shells have limited its applications, especially with respect to signal reproducibility and quantification. Here, a highly specific, well-defined Cu nanopolyhedral shell overgrowth chemistry is developed with the aid of polyethyleneimine (PEI) on AuNPs, and the use of this PEI-mediated Cu polyhedral nanoshell (CuP) chemistry is shown as a means of light-scattering signal enhancement for the development of naked-eye-based highly sensitive and quantitative detections of DNA and viruses...
August 7, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28774579/afm-nanoindentation-of-protein-shells-expanding-the-approach-beyond-viruses
#5
REVIEW
Wouter H Roos
The archetypical protein nanoshell is the capsid that surrounds viral genomes. These capsids protect the viral RNA or DNA and function as transport vehicle for their nucleic acid. The material properties of a variety of viral capsids have been probed by Atomic Force Microscopy. In particular nanoindentation measurements revealed the complex mechanics of these shells and the intricate interplay of the capsid with its genomic content. Furthermore, effects of capsid protein mutations, capsid maturation and the effect of environmental changes have been probed...
July 31, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28745411/a-hollow-structured-cus-cu2-s-au-nanohybrid-synergistically-enhanced-photothermal-efficiency-and-photoswitchable-targeting-effect-for-cancer-theranostics
#6
Xiaoran Deng, Kai Li, Xuechao Cai, Bin Liu, Yi Wei, Kerong Deng, Zhongxi Xie, Zhijian Wu, Ping'an Ma, Zhiyao Hou, Ziyong Cheng, Jun Lin
It is of great importance in drug delivery to fabricate multifunctional nanocarriers with intelligent targeting properties, for cancer diagnosis and therapy. Herein, hollow-structured CuS@Cu2 S@Au nanoshell/satellite nanoparticles are designed and synthesized for enhanced photothermal therapy and photoswitchable targeting theranostics. The remarkably improved photothermal conversion efficiency of CuS@Cu2 S@Au under 808 nm near-infrared (NIR) laser irradiation can be explained by the reduced bandgap and more circuit paths for electron transitions for CuS and Cu2 S modified with Au nanoparticles, as calculated by the Vienna ab initio simulation package, based on density functional theory...
July 26, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28738680/photothermal-effect-enhanced-cascade-targeting-strategy-for-improved-pancreatic-cancer-therapy-by-gold-nanoshell-mesoporous-silica-nanorod
#7
Ruifang Zhao, Xuexiang Han, Yiye Li, Hai Wang, Tianjiao Ji, Yuliang Zhao, Guangjun Nie
Pancreatic cancer, one of the leading causes of cancer-related mortality, is characterized by desmoplasia and hypovascular cancerous tissue, with a 5-year survival rate of less than 8%. To overcome the severe resistance of pancreatic cancer to conventional therapies, we synthesized gold nanoshell-coated rod-like mesoporous silica (GNRS) nanoparticles which integrated cascade tumor targeting (mediated by photothermal effect and molecular receptor binding) and photothermal treatment-enhanced gemcitabine chemotherapy, under mild near infrared laser irradiation condition...
July 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28717583/in-vivo-photothermal-treatment-with-real-time-monitoring-by-optical-fiber-needle-array
#8
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
#9
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...
May 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28695942/gold-silver-alloy-semi-nanoshell-arrays-for-label-free-plasmonic-biosensors
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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