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Na Chen, Jian-Tang Jiang, Cheng-Yan Xu, Shao-Jiu Yan, Liang Zhen
Core-shell particles with integration of ferromagnetic core and dielectric shell are attracting extensive attention for promising microwave absorption applications. In this work, CoNi microspheres with conical bulges were synthesized by a simple and scalable liquid-phase reduction method. Subsequent coating of dielectric materials was conducted to acquire core-shell structured CoNi@TiO 2 composite particles, in which the thickness of TiO 2 is about 40 nm. The coating of TiO 2 enables the absorption band of CoNi to effectively shift from K u to S band, and endows CoNi@TiO 2 microspheres with outstanding electromagnetic wave absorption performance along with a maximum reflection loss of 76...
February 16, 2018: Scientific Reports
Kuixin Cui, Bin Yan, Yijun Xie, Hui Qian, Xiaogang Wang, Qingxue Huang, Yuehui He, Shengming Jin, Hongbo Zeng
In this work, novel urchin-like Fe 3 O 4 @polydopamine (PDA)-Ag hollow microspheres have been prepared via a facile synthesis method by in situ reduction and growth of Ag nanoparticles on mussel-inspired PDA layers coated on Fe 3 O 4 hollow cores. The catalytic reduction efficiency and adsorption performance of the as-prepared urchin-like Fe 3 O 4 @polydopamine (PDA)-Ag hollow microspheres for model organic dyes (i.e., methylene blue and rhodamine B) under varying pH condition have been systematically investigated, which are demonstrated to be significantly enhanced as compared to that of spherical (relatively smooth) solid Fe 3 O 4 @PDA-Ag microspheres...
February 7, 2018: Journal of Hazardous Materials
Stefan A Kassumeh, Christian M Wertheimer, Annabel von Studnitz, Anna Hillenmayer, Claudia Priglinger, Armin Wolf, Wolfgang J Mayer, Daniel Teupser, Lesca M Holdt, Siegfried G Priglinger, Kirsten H Eibl-Lindner
PURPOSE: Posterior capsule opacification (PCO) still represents the main long-term complication of cataract surgery. Research into pharmacologic PCO prophylaxis is extensive. One promising candidate drug is methotrexate (MTX). Our aim is to determine the in vitro feasibility of MTX-loaded poly(lactic-co-glycolic) (PLGA) biomatrices sprayed on intraocular lenses (IOLs) as a drug-delivery implant. METHODS: Hydrophilic and hydrophobic acrylic IOLs were spray-coated with MTX-loaded PLGA...
February 16, 2018: Current Eye Research
Zaheer Ali, Anik Islam, Peter Sherrell, Mark Le-Moine, Georgios Lolas, Konstantinos Syrigos, Mehrdad Rafat, Lasse D Jensen
Therapeutic induction of blood vessel growth (angiogenesis) in ischemic tissues holds great potential for treatment of myocardial infarction and stroke. Achieving sustained angiogenesis and vascular maturation has, however, been highly challenging. Here we demonstrate that collagen:alginate hydrogels containing therapeutic, pro-angiogenic FGF-2, and formulated as microspheres, is a promising and clinically relevant vehicle for therapeutic angiogenesis. By titrating the amount of readily dissolvable and degradable collagen with more slowly degradable alginate in the hydrogel mixture, the degradation rates of the biomaterial controlling the release kinetics of embedded pro-angiogenic FGF-2 can be adjusted...
February 15, 2018: Biology Open
Jing Ma, Jing Zhao, Weihua Ren, Bin Tang
In this study, Titanium dioxide (TiO2) microspheres were synthesized by a hydrothermal method from the same precursor: titanium sulfate. Two different TiO2 microspheres with different surface and crystallinity were fabricated by adding different additives as the photoanode of dye-sensitized solar cells (DSSCs). The growth mechanisms of the TiO2 microspheres were discussed. The effect of surface status and the crystallinity of the TiO2 microspheres on the photovoltaic characteristic of DSSCs were investigated...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Sang-Don Lee, Mijin Lee, So-Yeon Park, Yumin Ha, Sang-Chul Jung, Hangun Kim
Prostate-specific antigen (PSA) is a glycoprotein that is secreted by prostate gland epithelial cells, and elevation of PSA level in serum is often observed with prostate cancer or prostate disorders. Therefore, detection of PSA level in patient specimens is used as a diagnostic marker when screening of prostate cancer. In this study, we developed PSA antibody-conjugated microsphere beads that can be used for quantitation of PSA. We optimized the procedure for bead preparation and validated the detection analysis by using LNCaP and DU-145 prostate cancer cell lysates...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Jian Li, Long Yan, Yufei Wang, Yuhong Kang, Wei Ma, Lei Liang
The cauliflower-like ZnS microspheres consisting of the nanospheres were prepared via one step template-free approach employing a solvothermal process using Zn(NO3)2·6H2O and CH4N2S as precursors in the mixture solution. The morphology, structure characterization, and crystal structure of the as-prepared ZnS were performed by X-ray diffraction, scanning electron microscopy, UV-visible absorption, and X-ray photoelectron spectroscopy. The results showed that cauliflowerlike ZnS microspheres were prepared under this condition and the size of the particles were about 3~5 μm...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Soumen Chandra, Karunamay Majee, Triveni Kumar Mahto, Sumanta Kumar Padhi, Sumanta Kumar Sahu
Anatase hierarchical TiO2 microsphere/carbon dots composite (HTM/CDs) was fabricated by a facile method for active visible light photocatalysis. The phase, morphology, microstructure and optical properties were investigated by X-ray diffraction, scanning electronmicroscopy, transmission electron microscopy and UV-VIS diffuse reflectance spectroscopy respectively. Under visible light illumination, the fabricated HTM/CDs composite was exhibited an enhanced photo catalytic activity compared to that of pure hierarchical TiO2 microspheres (HTM)...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Yu Bian, The Thien Ho, Younghwan Kwon, Jin Seuk Kim
Polyurethane (PU) foams with controlled porosity and pore structure are prepared via judicious study on expanding process parameters for thermoplastic expandable microspheres which are compatible with PU synthetic process. Thermal and mechanical properties of PU foams are found to be generally governed by amount of the porosity. Thermal conductivity of PU foams with controlled porosity is measured at 30 °C with transient hot bridge method. The measured thermal conductivity of PU foams is estimated using theoretical models, proving the formation of spherical pore structures of expandable microspheres in PU matrix and serving as an internal porous material...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Christoph Justinger, Juliana Gruden, Konstantinos Kouladouros, Christos Stravodimos, Peter Reimer, Andrea Tannapfel, Martin Binnenhei, Martin Bentz, Klaus Tatsch, Thomas Rüdiger, Michael R Schön
BACKGROUND: Selective internal radiotherapy (SIRT) has emerged as an effective therapy for patients with liver malignancies. Here, we report our analysis of histopathological changes in tumors and healthy liver tissue after SIRT and liver resection. Our main intent was to determine if specific histopathological changes occur in tumor and normal liver tissues. METHODS: We identified 17 patients in whom SIRT was applied to achieve liver resectability. Samples were taken from the resected liver tissue...
February 15, 2018: Journal of Surgical Oncology
Nariman Nezami, Nima Kokabi, Juan C Camacho, David M Schuster, Minzhi Xing, Hyun S Kim
INTRODUCTION: There are two different types of Y90 Microspheres, glass and resin, in the market for Y90 radioembolization (Y90-RE). This study aimed to investigate the dose of radiation delivered through glass vs. resin-based Y90-RE to intrahepatic cholangiocarcinoma (ICC). METHODS: In this retrospective study, 10 patients with ICC underwent Y90-RE, five underwent glass (Glass group) and other 5 resin (Resin group) microspheres. Technetium-99m macro-aggregated albumin (Tc-99m MAA) shunt study was performed two weeks before Y90-RE...
January 16, 2018: Nuclear Medicine and Biology
Jiajia Xiao, Po Li, Xiaogang Wen
Novel jujube-like hierarchical TiO2 microspheres (HTM) were synthesized by an alkali corrosion process of titanium phosphate (Ti2O3(H2PO4)2·2H2O) microspheres. The hierarchical titanium phosphate microspheres (HTPM) intermediates consisting of nanoflakes with a thickness of 20 nm were prepared firstly by a facile hydrothermal method. After reacting with diluted NaOH at low temperature and atmospheric pressure,following by subsequent acid washing and calcination process, the HTPM intermediates transformed to TiO2 with well remained microsphere morphology, while the nanoflakes became porous, and some new nanowires formed between the nanoflakes...
February 15, 2018: Nanotechnology
Tatjana Gruber-Rouh, Cornelia Schmitt, Nagy N N Naguib, N A Nour-Eldin, Katrin Eichler, Martin Beeres, Thomas J Vogl
BACKGROUND: To evaluate survival data and local tumor control after transarterial chemoembolization in two groups with different embolization protocols for the treatment of HCC patients. METHODS: Ninty-nine patients (mean age: 63.6 years), 78 male (78.8%) with HCC were repeatedly treated with chemoembolization in 4-week-intervals. Eighty-eight patients had BCLC-Stage-B and in 11 patients, chemoembolization was performed for bridging (BCLC-Stage-A). In total, 667 chemoembolization treatments were performed (mean 6...
February 14, 2018: BMC Cancer
Inger Keussen, Johan Bengtsson, Dolores Gavier-Widén, Erika Karlstam
Background Transarterial embolization with particles is a relatively common treatment method in both malignant and benign disorders. Permanent occlusion of the uterine arteries may sometimes be disadvantageous. Purpose To compare the local tissue effects, possible side effects, and extent of recanalization following uterine artery embolization, using either degradable or non-degradable microspheres in a sheep model. Material and Methods In 22 female sheep, the uterine artery (UA) was unilaterally, superselectively embolized, with either degradable starch microspheres-DSM (group A) or calibrated gelatin coated spherical shape tris-acryl microspheres-TGMS (group B)...
January 1, 2018: Acta Radiologica
Pao-Hung Lin, Ying-Tang Huang, Fu-Wen Lin
We present a method, the bacterial mineral excretion (BME), for synthesizing two kinds of microcapsules, sodium tungstate and sodium molybdate, and the two metal oxides' corresponding nanoparticles-the former being as small as 22 nm and the latter 15 nm. We fed two strains of bacteria, Shewanella algae and Pandoraea sp., with various concentrations of tungstate or molybdate ions. The concentrations of tungstate and molybdate were adjusted to make microcapsules of different length-to-diameter ratios. We found that the higher the concentration the smaller the nanoparticles were...
January 30, 2018: Journal of Visualized Experiments: JoVE
Changhao Zhu, Xiaoe Ma, Dandan Ma, Tianzhu Zhang, Ning Gu
For computed tomography (CT) angiography and drug release application, a kind of novel dextran hydrogel microspheres were prepared. β-cyclodextrin (β-CD) grafted poly(methyl vinyl ether-altmaleic acid) (PMVE-alt-MA-g-β-CD) and succinic acid modified dextran (Dex-SA) were first prepared, and then PMVE-alt-MA-g-β-CD was further used as the cross-linking agent to cross link Dex-SA for the formation of dextran hydrogel microspheres by using an inverse suspension polymerization method for the potential interventional embolization...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Xujun Wang, Yong Wan, Ruiqi Wang, Xiantang Xu, He Wang, Mingning Chang, Feng Yuan, Xiaohui Ge, Weiquan Shao, Sheng Xu
LiNi1/3ZnxCo1/3-xMn1/3O2 (0.000 ≤ x ≤ 0.133) hollow microspheres are synthesized using MnO2 hollow microspheres both as a self-template and Mn source. These hollow microspheres, ~4 μm in diameter, are composed of approximately 300 nm basic nanoparticles. The XRD patterns of LiNi1/3ZnxCo1/3-xMn1/3O2 were analyzed by the RIETAN-FP program, and the obtained samples have a layered α-NaFeO2 structure. Electrochemical performances of the samples were carried out between 2.5 V and 4.5 V. The behavior of the lattice parameters is consistent with Cycling performance and rate performance change with increase of x...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Lin Lu, Shurui Yang, Feixia Min, Shiquan Wang, Fei Teng, Guohua Li, Chuanqi Feng, Zhaoquan Ai
Zn1-xCoxCO3 (ZCCO) microspheres were synthesized by a modified solvothermal method (ball milling-solvothermal combination method) using ZnCl2, CoCl2, and NH4HCO3 as raw materials. All samples were characterized by X-ray diffractometer (XRD), Fourier transform infrared spectra (FT-IR), and Scanning electron microscopy (SEM) technique. The results showed the introduction of Co and molar ratio of Zn and Co play crucial roles in the morphology and electrochemical performance of the ZCCO. As anode materials for lithium ion battery (LIB), all ZCCO electrodes possess high specific capacities and good cycle performance...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Lixia Chen, Yiting Peng, Fang He, Guigao Liu, Yuan Huang, Yuhuan Meng, Ruisong Guo
Au@ZnO nanospheres with controlled core-shell and yolk-shell features were successfully fabricated through a facile template-based solvothermal method using carbonaceous layers as intermediate. The active carbonaceous layers containing numerous surface functional groups such as OH and C═O play key roles in fabrication of the Au@ZnO nanospheres. The structures of Au@ZnO can easily controlled by adjusting the concentration of Zn ions aqueous solution and/or the size of Au@C microspheres. The synthesis strategy proposed in this paper is also verified to be suitable for fabricating some other Au@metallic oxides nanospheres such as Au@SnO2 and Au@Fe2O3 with controlled structures...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Feixia Min, Shurui Yang, Qing Zhang, Chuang Yang, Wei Gao, Shiquan Wang, Fei Teng, Guohua Li, Zhaoquan Ai
α-Fe2O3 and Cu-doped α-Fe2O3 microspheres were similarly synthesized by solvothermal method. These microspheres were characterized by X-ray diffraction (XRD), and scanning electron microscope (SEM) technique. As anode materials for lithium-ion batteries (LIBs), Cu-doped α-Fe2O3 electrodes exhibit better electrochemical performance (higher specific capacities of 600 mAhg-1 and better cycling performance), compared with pure α-Fe2O3 electrode. Additionally, the effects of different Cu2+-doping contents and reaction times on the morphology and the electrochemical properties were also discussed...
June 1, 2018: Journal of Nanoscience and Nanotechnology
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