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https://www.readbyqxmd.com/read/28545235/a-high-sensitive-pressure-sensor-using-a-single-mode-fiber-embedded-microbubble-with-thin-film-characteristics
#1
Guanjun Wang, Xinglin Liu, Zhiguo Gui, Yongquan An, Jinyu Gu, Meiqin Zhang, Lu Yan, Gao Wang, Zhibin Wang
A new fiber pressure sensor is proposed and analyzed in this paper. A commercial arc fusion splicer and pressure-assisted arc discharge technology are used here to fabricate a silica hollow microbubble from a common glass tube with the characteristics of a thin film. Then the single mode fiber is embedded into the microbubble to form a fiber Fabry-Perot interferometer by measuring the reflected interference spectrum from the fiber tip and microbubble end. As the wall thickness of the micro-bubble can reach up to several micrometers, it can then be used for measuring the outer pressure with high sensitivity...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28544962/effect-of-immobilization-on-the-antimicrobial-activity-of-a-cysteine-terminated-antimicrobial-peptide-cecropin-p1-tethered-to-silica-nanoparticle-against-e-coli-o157-h7-edl933
#2
Xi Wu, Pei-Hsun Wei, Xiao Zhu, Mary J Wirth, Arun Bhunia, Ganesan Narsimhan
Antimicrobial peptides (AMPs) have the ability to penetrate the cell membrane, form pores which eventually lead to cell death. Immobilization of AMP on nanoparticles can play a major role in antimicrobial materials, biosensors for pathogen detection and in food safety. The minimum inhibitory concentration (MIC) of free Cecropin P1 (CP1, sequence SWLSTAKKLENSAKKRLSEGIAIAIQGGPR) and adsorbed on silica nanoparticle against E. coli O157:H7 EDL933 were 0.78μg/ml. This was found to be consistent with preservation of α-helical secondary structure of CP1 upon adsorption as indicated by circular dichroism (CD)...
May 17, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28544803/hollow-mesoporous-carbon-microparticles-and-micromotors-with-single-holes-templated-by-colloidal-silica-assisted-gas-bubbles
#3
Xiaoxi Huang, Tao Zhang, Tewodros Asefa
A simple, new synthetic method that produces hollow, mesoporous carbon microparticles, each with a single hole on its surface, is reported. The synthesis involves unique templates, which are composed of gaseous bubbles and colloidal silica, and poly(furfuryl alcohol) as a carbon precursor. The conditions that give these morphologically unique carbon microparticles are investigated, and the mechanisms that result in their unique structures are proposed. Notably, the amount of colloidal silica and the type of polymer are found to hugely dictate whether or not the synthesis results in hollow asymmetrical microparticles, each with a single hole...
May 19, 2017: Small
https://www.readbyqxmd.com/read/28544603/metabolic-reprogramming-of-macrophages-exposed-to-silk-poly-lactic-co-glycolic-acid-and-silica-nanoparticles
#4
Raquel Saborano, Thidarat Wongpinyochit, John D Totten, Blair F Johnston, F Philipp Seib, Iola F Duarte
Monitoring macrophage metabolism in response to nanoparticle exposure provides new insights into biological outcomes, such as inflammation or toxicity, and supports the design of tailored nanomedicines. This paper describes the metabolic signature of macrophages exposed to nanoparticles ranging in diameter from 100 to 125 nm and made from silk, poly(lactic-co-glycolic acid) or silica. Nanoparticles of this size and type are currently at various stages of preclinical and clinical development for drug delivery applications...
May 8, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28544508/enhancement-of-plasma-protein-adsorption-and-osteogenesis-of-hmscs-by-functionalized-siloxane-coatings-for-titanium-implants
#5
Maria Martínez-Ibáñez, N Sanjeeva Murthy, Yong Mao, Julio Suay, Marilo Gurruchaga, Isabel Goñi, Joachim Kohn
A series of sol-gel derived silicon based coatings were developed to improve the osseointegration of commercial titanium dental implants. The osseointegration starts with a positive interaction between the implant surface and surrounding tissues, which is facilitated by the adsorption of plasma proteins onto the biomaterial surface immediately after implantation. It is likely that the enhancement of protein adsorption to titanium implants leads to a better implant/tissue integration. In addition, silica based biomaterials have been shown to promote osteoblast differentiation...
May 25, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28544466/simultaneous-imaging-of-endogenous-survivin-mrna-and-on-demand-drug-release-in-live-cells-by-using-a-mesoporous-silica-nanoquencher
#6
Peiyan Yuan, Xin Mao, Kok Chan Chong, Jiaqi Fu, Sijun Pan, Shuizhu Wu, Changmin Yu, Shao Q Yao
The design of multifunctional drug delivery systems capable of simultaneous target detection, imaging, and therapeutics in live mammalian cells is critical for biomedical research. In this study, by using mesoporous silica nanoparticles (MSNs) chemically modified with a small-molecule dark quencher, followed by sequential drug encapsulation, MSN capping with a dye-labeled antisense oligonucleotide, and bioorthogonal surface modification with cell-penetrating poly(disulfide)s, the authors have successfully developed the first mesoporous silica nanoquencher (qMSN), characterized by high drug-loading and endocytosis-independent cell uptake, which is able to quantitatively image endogenous survivin mRNA and release the loaded drug in a manner that depends on the survivin expression level in tumor cells...
May 24, 2017: Small
https://www.readbyqxmd.com/read/28544287/fast-clearable-nanocarriers-conducting-chemo-photothermal-combination-therapy-to-inhibit-recurrence-of-malignant-tumors
#7
Lingzhi Zhao, Wei Yuan, Huijun Phoebe Tham, Hongzhong Chen, Pengyao Xing, Huijing Xiang, Xin Yao, Xiaochen Qiu, Yu Dai, Liangliang Zhu, Fuyou Li, Yanli Zhao
Inhomogeneous heating by photothermal therapy (PTT) during cancer treatment often results in the recurrence of tumors. Thus, integrating PTT with chemotherapy (CHT) may provide a complementary treatment for enhanced therapeutic efficiency. Herein, this study develops a hollow structured polymer-silica nanohybrid (HPSN) as a nanocarrier to simultaneously deliver the anticancer drug paclitaxel and photothermal agent palladium phthalocyanine to tumors through enhanced permeation and the retention effect. A combinational CHT/PTT therapy on mice bearing aggressive tumor grafts is conducted...
May 24, 2017: Small
https://www.readbyqxmd.com/read/28544211/highly-luminescent-and-ultra-stable-cspbbr3-pervoskite-quantum-dots-silica-alumina-monolith
#8
Zhichun Li, Long Kong, Shouqiang Huang, Liang Li
We successfully prepared QDs-silica/alumina monolith (QDs-SAM) by a simple sol-gel reaction of Al-Si single precursors with CsPbBr3 QDs blended in toluene solution, without adding water and catalyst. The resultant transparent monolith exhibits high photoluminescence quantum yields (PLQY) up to 90%, and good photostability under strong illumination of blue light for 300 h. We demonstrated that the preliminary ligand exchange of didodecyl dimethyl ammonium bromide (DDAB) was very important to protect CsPbBr3 QDs from the surface damages during sol-gel reaction, which not only allowed us to maintain the original optical properties of CsPbBr3 QDs but also avoided the aggregation of QDs and make the monolith transparent...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28543776/a-surface-molecularly-imprinted-polymer-as-chiral-stationary-phase-for-chiral-separation-of-1-1-binaphthalene-2-naphthol-racemates
#9
Hongxing Dong, Danxia Zhang, Hailong Lin, Yudan Wang, Lijia Liu, Meixia Zheng, Xiaobo Li, Chunhong Zhang, Junqing Li, Peng Zhang, Juhyok So
Acrylamide (AM) was copolymerized with ethylene glycol dimethacrylate (EGDMA) in the presence of (R)-1,1'-binaphthalene-2-naphthol (BINOL) as the template molecules on the surface of silica gel by a free radical polymerization to produce a chiral stationary phase based on the surface molecularly imprinted polymer (SMIP-CSP). The SMIP-CSP showed a much better separation factor (α = 4.28) than the CSP based on the molecularly imprinted polymer (MIP-CSP) without coating on the silica gel (α = 1.96) during the chiral separation of BINOL enantiomers by high-performance liquid chromatography...
May 25, 2017: Chirality
https://www.readbyqxmd.com/read/28543628/tunable-wettability-of-electrospun-polyurethane-silica-composite-membranes-for-effective-separation-of-water-in-oil-and-oil-in-water-emulsions
#10
Libin Liu, Wenyuan Fang, Gailan Guo
Polymer-dominated membranes with switchable wettability are highly desired due to their on-demand applications for oil/water separation. Herein, we report a low-cost methodology to fabricate membranes consisting of hyperbranched polyurethane (HBPU) and fluorine-modified silica (F-SiO2) with tunable wettability by electrospinning. The HBPU/F-SiO2 composite membranes can be transformed from superhydrophobicity to superhydrophilicity via plasma treatment, which exhibit different wettability for effective separation of surfactant-stabilized water-in-oil and oil-in-water emulsions...
May 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28542311/18f-fdg-pet-ct-based-early-treatment-response-evaluation-of-nanoparticle-assisted-photothermal-cancer-therapy
#11
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/28541689/influence-of-co-ion-nature-on-the-gelation-kinetics-of-colloidal-silica-suspensions
#12
Jean-Luc Trompette
The influence of the nature of three representative monovalent co-ions on the gelation kinetics of Ludox suspensions has been investigated. At a given Ludox volume fraction and for the same concentration of potassium salt, the gelation time is longer as the studied anion presents a more pronounced kosmotrope character. As the screening of the silica surface charge is similar since the same cationic counterion is taken, these results highlight the unexpected role played by hydration effects imparted by the co-ions when particles are pushed together as gelation proceeds...
May 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28541688/circularly-polarized-luminescence-of-silica-grafted-europium-chiral-derivatives-prepared-through-a-sequential-functionalization
#13
Lidia Armelao, Daniela Belli Dell'Amico, Luca Bellucci, Gregorio Bottaro, Lorenzo Di Bari, Luca Labella, Fabio Marchetti, Simona Samaritani, Francesco Zinna
We describe a new organic/inorganic material emitting circularly polarized luminescence (CPL). The hybrid system was obtained by the following steps: (i) preliminary grafting of the europium N,N-dibutylcarbamate [Eu(O2CNBu2)3] complex onto silica, (ii) substitution of the residual carbamato groups with anionic 1,3-diphenyl-1,3-propanedionato ligands (dbm), and (iii) subsequent introduction of the neutral tridentate chiral ligand 2,6-bis(isopropyl-2-oxazolin-2-yl)pyridine ((i)Pr-PyBox) in the metal coordination sphere...
May 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28541655/in-vitro-study-of-receptor-mediated-silica-nanoparticles-delivery-across-blood-brain-barrier
#14
Yang Song, Dan Du, Lei Li, Jun Xu, Prashanta Dutta, Yuehe Lin
A brain drug delivery system has been demonstrated by attaching lactoferrin (Lf) on the silica nanoparticles (Si NPs). The nanoparticle surface was modified with the polyethylene glycol to reduce protein adsorption. The transport efficiency of Lf attached Si NPs was studied using an in vitro blood-brain barrier (BBB) model consists of three distinct types of cells: endocytes, pericytes and astrocytes. Transfer of NPs from the apical side to the basolateral side is observed. The results indicated that Lf attached Si NPs demonstrated enhanced transport efficiency across the BBB with size-dependent compared to bare Si NPs...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540581/streptococcus-mutans-adherence-and-biofilm-formation-on-experimental-composites-containing-dicalcium-phosphate-dihydrate-nanoparticles
#15
Andrei C Ionescu, Sebastian Hahnel, Gloria Cazzaniga, Marco Ottobelli, Roberto Ruggiero Braga, Marcela Charantola Rodrigues, Eugenio Brambilla
This study aimed at evaluating bacterial adhesion and biofilm formation on resin-based composites (RBC) including dicalcium phosphate dihydrate nanoparticles (nDCPD). METHODS: Specimens were prepared from experimental RBCs with BisGMA/TEGDMA resin matrix including 20 vol% of either nDCPD (nDCPD-RBC), TEGDMA-functionalized nDPCD (F-nDCPD-RBC) or silanized silica (SiO2-RBC). Neat resin blend (control-Resin), conventional nanohybrid RBC (control-RBC) and human enamel were used for reference...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28539719/ultrasound-assisted-extraction-of-ursolic-acid-from-the-flowers-of-ixora-coccinia-linn-rubiaceae-and-antiproliferative-activity-of-ursolic-acid-and-synthesized-derivatives
#16
Silvana Amadeu Ferreira Alves Monteath, Maria Aparecida M Maciel, Raquel Garcia Vega, Heloisa de Mello, Carollina de Araújo Martins, Andressa Esteves-Souza, Cerli Rocha Gattass, Aurea Echevarria
BACKGROUND: Ixora coccinea Linn (Rubiaceae) is an evergreen shrub with bright scarlet colored flowers found in several tropical and subtropical countries. It is used as an ornamental and medicinal plant. Phytochemical studies revealed that its major special metabolites are triterpene acids, such as ursolic and oleanolic acid. OBJECTIVE: To evaluate the isolation of ursolic acid (UA) (1) from methanol extracts of I. coccinea flowers through two methodologies, to prepare four derivatives, and to evaluate the cytotoxic effect against six cancer cell lines...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28539702/one-step-synthesis-of-hierarchical-zsm-5-using-cetyltrimethylammonium-as-mesoporogen-and-structure-directing-agent
#17
Lingqian Meng, Brahim Mezari, Maarten G Goesten, Emiel J M Hensen
Hierarchical ZSM-5 zeolite is hydrothermally synthesized in a single step with cetyltrimethylammonium (CTA) hydroxide acting as mesoporogen and structure-directing agent. Essential to this synthesis is the replacement of NaOH with KOH. An in-depth solid-state NMR study reveals that, after early electrostatic interaction between condensed silica and the head group of CTA, ZSM-5 crystallizes around the structure-directing agent. The crucial aspect of using KOH instead of NaOH lies in the faster dissolution of silica, thereby providing sufficient nutrients for zeolite nucleation...
May 9, 2017: Chemistry of Materials: a Publication of the American Chemical Society
https://www.readbyqxmd.com/read/28537490/the-magnetic-field-of-magnetic-resonance-imaging-systems-does-not-affect-cells-labeled-with-micrometer-sized-iron-oxide-particles
#18
Martin Kluge, Annekatrin Leder, Karl Herbert Hillebrandt, Benjamin Struecker, Dominik Geisel, Timm Denecke, Rebeka Dalma Major, Anja Reutzel-Selke, Peter Tang, Steffen Lippert, Christian Schmidt, Johann Pratschke, Igor M Sauer, Nathanael Raschzok
INTRODUCTION: Labeling using iron oxide particles enables cell tracking via magnetic resonance imaging (MRI). However, the magnetic field can affect the particle-labeled cells. Here, we investigated the effects of a clinical MRI system on primary human hepatocytes labeled using micrometer-sized iron oxide particles (MPIOs). METHODS: HuH7 tumor cells were incubated with increasing concentrations of biocompatible, silica-based, micron-sized iron oxide-containing particles (sMPIO; 40 - 160 particles/cell)...
May 24, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28537380/a-dna-tetrahedron-nanoprobe-with-controlled-distance-of-dyes-for-multiple-detection-in-living-cells-and-in-vivo
#19
Na Li, Meimei Wang, Xiaonan Gao, Zhengze Yu, Wei Pan, Hongyu Wang, Bo Tang
Multicomponent quantitative detection in living samples is becoming increasingly important, however, the current detection strategy may cause fluorescence self-quenching and reduce the sensitivity of detection. To solve the problem, we develop a DNA tetrahedral nanoprobe to control the dyes distance for simultaneous detection of multiple analytes. Compared to mesoporous silica nanoparticles based nanoprobes, the DNA tetrahedral nanoprobes display enhanced fluorescence intensities due to partially avoiding the fluorescence resonance energy transfer...
May 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28537269/in-situ-dynamic-tracking-of-heterogeneous-nanocatalytic-processes-by-shell-isolated-nanoparticle-enhanced-raman-spectroscopy
#20
Hua Zhang, Chen Wang, Han-Lei Sun, Gang Fu, Shu Chen, Yue-Jiao Zhang, Bing-Hui Chen, Jason R Anema, Zhi-Lin Yang, Jian-Feng Li, Zhong-Qun Tian
Surface molecular information acquired in situ from a catalytic process can greatly promote the rational design of highly efficient catalysts by revealing structure-activity relationships and reaction mechanisms. Raman spectroscopy can provide this rich structural information, but normal Raman is not sensitive enough to detect trace active species adsorbed on the surface of catalysts. Here we develop a general method for in situ monitoring of heterogeneous catalytic processes through shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) satellite nanocomposites (Au-core silica-shell nanocatalyst-satellite structures), which are stable and have extremely high surface Raman sensitivity...
May 24, 2017: Nature Communications
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