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https://www.readbyqxmd.com/read/29716333/determining-the-refractive-index-of-particles-using-glare-point-imaging-technique
#1
Rui Meng, Baozhen Ge, Qieni Lu, Xiaoxue Yu
A method of measuring the refractive index of a particle is presented from a glare-point image. The space of a doublet image of a particle can be determined with high accuracy by using auto-correlation and Gaussian interpolation, and then the refractive index is obtained from glare-point separation, and a factor that may influence the accuracy of glare-point separation is explored. Experiments are carried out for three different kinds of particles, including polystyrene latex particles, glass beads, and water droplets, whose measuring accuracy is improved by the data fitting method...
April 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29683257/preparation-of-swellable-hydrogel-containing-colloidosomes-from-aqueous-two-phase-pickering-emulsion-droplets
#2
Jean-Paul Douliez, Nicolas Martin, Thomas Beneyton, Jean-Charles Eloi, J-Paul Chapel, Laurence Navailles, Jean-Christophe Baret, Stephen Mann, Laure Béven
We describe the fabrication of stable colloidosomes derived from water-in-water Pickering-like emulsions produced by addition of fluorescent amine-modified polystyrene latex beads to an aqueous two-phase system consisting of dextran-enriched droplets dispersed in a PEG-enriched continuous phase. Addition of polyacrylic acid followed by carbodiimide-induced crosslinking with dextran produces hydrogelled droplets capable of reversible swelling and selective molecular uptake and exclusion. Colloidosomes produced specifically in all-water systems could offer new opportunities in microencapsulation and the bottom-up construction of synthetic protocells...
April 23, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29448682/optical-characteristics-of-double-layered-plasmonic-structure-using-nanopatterning-process
#3
Doo Gun Kim, Seon Hoon Kim, Hyun Chul Ki, Tae Un Kim, Hong-Seung Kim, Young Wan Choi, Min Hyeok Jo, Jae Cheol Shin
A double layered plasmonic device based on transferring technique with polystyrene nano-beads is analyzed and demonstrated to increase the sensing characteristics of plasmonic sensor system. The double layered plasmonic devices are calculated using the three-dimensional finite-difference time-domain method for the width and thickness of the nano-hole structures. The double layered plasmonic devices with different diameters of the Au nano-hole are fabricated by transferring method with commercially available chloromethyl latex with a diameter of 0...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442841/synthesis-of-the-hollow-silica-nanospheres-and-p-al-and-yb-co-doped-silica-for-optical-fiber-preform
#4
Shuxin Liu, Lin Zhang, Xiaodong Jiang, Qiuxia Wang, Min He
The hollow silica nanospheres were synthesized by the template method and sol-gel method with ammonium hydroxide as base catalysts. Phase compositions, microstructures and specific surface area of the products were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM), field emission transmission electron microscopy (TEM), energy-dispersive spectrometry (EDS) and Brunauere-Emmette-Teller (BET). The results show that the hollow silica nanospheres synthesized with 10 ml polystyrene-methylacrylic acid latex, 116...
May 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29373240/sticking-particles-to-solid-surfaces-using-moringa-oleifera-proteins-as-a-glue
#5
Shirin Nouhi, Marc Pascual, Maja S Hellsing, Habauka M Kwaambwa, Maximilian W A Skoda, Fredrik Höök, Adrian R Rennie
Experimental studies have been made to test the idea that seed proteins from Moringa oleifera which are novel, natural flocculating agents for many particles could be used to promote adhesion at planar interfaces and hence provide routes to useful nanostructures. The proteins bind irreversibly to silica interfaces. Surfaces that had been exposed to protein solutions and rinsed were then exposed to dispersions of sulfonated polystyrene latex. Atomic force microscopy was used to count particle density and identified that the sticking probability was close to 1...
January 8, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29279616/cytocompatibility-of-a-self-adhesive-gutta-percha-root-filling-material
#6
Joyce Nascimento, Miriam Zaccaro Scelza, Gutemberg Gomes Alves, Adriana Linhares, Antonio Canabarro, Jose Mauro Granjeiro, Gustavo De-Deus
Context: A novel root-filling material based on the incorporation of ultrafine alkaline bioactive glass particles (bioactive gutta-percha, [BGP]) was developed to work without sealer. Aim: In the present study, the objective was to verify the in vitro biological response to this material by assessing its cytocompatibility. Materials and Methods: Prototypes of BGP were compared to conventional gutta-percha (GP), dense polystyrene beads as a negative control and fragments of latex as a positive control...
May 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29243297/graphitic-carbon-nitride-as-a-distinct-solid-stabilizer-for-emulsion-polymerization
#7
Qian Cao, Qianling Cui, Yu Yang, Jingsan Xu, Chenhui Han, Lidong Li
g-C3 N4 has been found to be highly functional in many fields, such as photocatalysis, electrocatalysis, and chemical analysis. Pickering emulsion polymerization is a fascinating strategy to fabricate a range of nanomaterials, in which the emulsion is stabilized by solid particles, rather than molecular surfactants. Herein, we demonstrate that g-C3 N4 can act as a remarkable stabilizer for Pickering emulsion polymerization. Contrary to normal Pickering systems, monodisperse polystyrene microspheres with tunable size, surface charge, and morphology were achieved using this approach...
February 9, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29165321/interfacial-rheology-of-model-particles-at-liquid-interfaces-and-its-relation-to-bicontinuous-pickering-emulsions
#8
J H J Thijssen, J Vermant
Interface-dominated materials are commonly encountered in both science and technology, and typical examples include foams and emulsions. Conventionally stabilised by surfactants, emulsions can also be stabilised by micron-sized particles. These so-called Pickering-Ramsden (PR) emulsions have received substantial interest, as they are model arrested systems, rather ubiquitous in industry and promising templates for advanced materials. The mechanical properties of the particle-laden liquid-liquid interface, probed via interfacial rheology, have been shown to play an important role in the formation and stability of PR emulsions...
January 17, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29126589/explicit-role-of-ionic-strength-in-retention-behavior-of-polystyrene-latex-particles-in-sedimentation-field-flow-fractionation-slip-boundary-model
#9
Kyunil Rah, Sujeong Han, Jaeyeong Choi, Chul Hun Eum, Seungho Lee
We investigate an explicit role of the ionic strength in the retention behaviors of polystyrene (PS) latex particles in sedimentation field-flow fractionation (SdFFF) by hinging upon the retention theory recently developed [1] asR=(Ro +vb * )/(1+vb * ). Here R is an experimental retention ratio, and Ro is the analytical expression of the standard retention theory based on the parabolic flow velocity. The reduced boundary velocityvb * is expressed in terms of the ionic strength I of the carrier liquid as vb * =vb,o * /(1+εI), where vb,o * =0...
December 15, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29072897/characterizing-nanoparticles-in-biological-matrices-tipping-points-in-agglomeration-state-and-cellular-delivery-in-vitro
#10
John W Wills, Huw D Summers, Nicole Hondow, Aishwarya Sooresh, Kenith E Meissner, Paul A White, Paul Rees, Andy Brown, Shareen H Doak
Understanding the delivered cellular dose of nanoparticles is imperative in nanomedicine and nanosafety, yet is known to be extremely complex because of multiple interactions between nanoparticles, their environment, and the cells. Here, we use 3-D reconstruction of agglomerates preserved by cryogenic snapshot sampling and imaged by electron microscopy to quantify the "bioavailable dose" that is presented at the cell surface and formed by the process of individual nanoparticle sequestration into agglomerates in the exposure media...
December 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/29057408/co-encapsulation-of-cdse-zns-and-ceo2-nanoparticles-in-waterborne-polymer-dispersions-enhancement-of-fluorescence-emission-under-sunlight
#11
Alicia De San Luis, Maria Paulis, Jose Ramon Leiza
Hybrid core/shell polymer particles with co-encapsulated quantum dots (QDs) (CdSe/ZnS) and CeO2 nanoparticles have been synthesized in a two stage semi-batch emulsion polymerization process. In the first stage, both inorganic nanoparticles are incorporated into cross-linked polystyrene (PS) particles by miniemulsion polymerization. This hybrid dispersion is then used as the seed to produce the core/shell particles by starved feeding of methyl methacrylate and divinylbenzene (MMA/DVB) monomers. The core/shell hybrid dispersions maintained in the dark exhibit stable fluorescence emission over time, and notably their fluorescence intensity increases under sunlight, likely due to the effect of the co-encapsulated CeO2 nanoparticles that change the optical properties of the environment of the quantum dot particles...
November 15, 2017: Soft Matter
https://www.readbyqxmd.com/read/28983124/design-and-development-of-an-electrostatic-screen-battery-for-emission-control-esbec
#12
Taewon Han, Gediminas Mainelis
Current diesel particulate filters (DPFs) can effectively capture the exhaust particles, but they add to engine backpressure and accumulate particles during their operation, which results in the need to regenerate the DPFs by burning off the collected particles periodically. This regeneration results in aerosol emissions, especially in the 10-30 nanometer size range and contributes to ultrafine particle pollution. In this research, we designed and developed a prototype of a novel diesel exhaust control device: the Electrostatic Screen Battery for Emissions Control (ESBEC)...
May 2017: Journal of Aerosol Science
https://www.readbyqxmd.com/read/28972614/effects-of-ph-on-the-structure-and-mechanical-properties-of-dried-ph-responsive-latex-particles
#13
T Sekido, M Kappl, H-J Butt, S Yusa, Y Nakamura, S Fujii
Micrometer-sized monodisperse polystyrene (PS) particles carrying a pH-responsive poly[2-(diethylamino)ethyl methacrylate] (PDEA) colloidal stabilizer were synthesized via free radical dispersion polymerization. X-ray photoelectron spectroscopy and electrophoretic measurements verified that PDEA covered the PS particle surface. At pH 3.0 and 6.3, where the PDEA is protonated and cationically charged, the PDEA-PS particles were well dispersed in aqueous media thanks to the water soluble PDEA stabilizer and slowly sedimented due to gravity and enriched at the bottom of the glass vials...
October 25, 2017: Soft Matter
https://www.readbyqxmd.com/read/28970935/optically-transparent-dense-colloidal-gels
#14
M Zupkauskas, Y Lan, D Joshi, Z Ruff, E Eiser
Traditionally it has been difficult to study the porous structure of dense colloidal gels and (macro) molecular transport through them simply because of the difference in refractive index between the colloid material and the continuous fluid phase surrounding it, rendering the samples opaque even at low colloidal volume fractions. Here, we demonstrate a novel colloidal gel that can be refractive index-matched in aqueous solutions owing to the low refractive index of fluorinated latex (FL)-particles (n = 1.37)...
August 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28946664/monolayer-colloidal-crystals-by-modified-air-water-interface-self-assembly-approach
#15
Xin Ye, Jin Huang, Yong Zeng, Lai-Xi Sun, Feng Geng, Hong-Jie Liu, Feng-Rui Wang, Xiao-Dong Jiang, Wei-Dong Wu, Wan-Guo Zheng
Hexagonally ordered arrays of polystyrene (PS) microspheres were prepared by a modified air-water self-assembly method. A detailed analysis of the air-water interface self-assembly process was conducted. Several parameters affect the quality of the monolayer colloidal crystals, i.e., the colloidal microsphere concentration on the latex, the surfactant concentration, the polystyrene microsphere diameter, the microsphere polydispersity, and the degree of sphericity of polystyrene microspheres. An abrupt change in surface tension was used to improve the quality of the monolayer colloidal crystal...
September 25, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28940984/a-novel-guidewire-integrated-embolic-protection-filter-device-with-a-handy-folding-system-in-vitro-and-in-vivo-performance-assessment
#16
Hiroki Watanabe, Naritatsu Saito, Yoshimasa Nagata, Erika Yamamoto, Kenji Nakatsuma, Bao Bingyuan, Shin Watanabe, Junichi Tazaki, Takeshi Kimura, Kanji Inoue
OBJECTIVES: We developed a novel guidewire-integrated filter device with a handy-folding system (IFD: Inoue filter device). In vitro and in vivo studies were conducted to evaluate the feasibilityof the IFD. BACKGROUND: Although distal atheromatous and thrombotic embolizations remain unresolved critical issues during catheter interventions, distal protection devices are infrequently used partly because of reduced lower maneuverability. METHODS: In the in vitro experiment, we created an experimental circulation model composed of silicone latex tubes, a reservoir, and a roller pump...
September 20, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28867354/development-of-a-simple-and-economical-diagnostic-test-for-canine-leishmaniasis
#17
Valeria S García, Verónica D G Gonzalez, Luis Gugliotta, Alexis Burna, Ana Demonte, Diego G Arias, Matías S Cabeza, Sergio A Guerrero
Visceral leishmaniasis is a public health problem worldwide. The early diagnosis in dogs is crucial, since they are an epidemiologically relevant reservoir of the disease. The aim of a field study is to early identify the disease allowing rapid intervention to reduce its effects. We propose an immunoagglutination test as a visual in situ method for diagnosis of canine visceral leishmaniasis. Latex-protein complexes were sensitized by covalent coupling of a chimeric recombinant antigen of Leishmania spp. onto polystyrene latex with carboxyl functionality...
November 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28866882/organophosphorus-flame-retardants-and-plasticizers-in-building-and-decoration-materials-and-their-potential-burdens-in-newly-decorated-houses-in-china
#18
Yan Wang, Minmin Hou, Qiaonan Zhang, Xiaowei Wu, Hongxia Zhao, Qing Xie, Jingwen Chen
Organophosphorus flame retardants (OPFRs) have been increasingly used in various building and decoration materials to fulfill fire safety standards since the phasing out of polybrominated diphenyl ethers. We determined OPFR concentrations in the most commonly used building and decoration materials available in local markets and online in China. The OPFR concentrations varied significantly, from 14.78 ng/g (putty powder) to 9649000 ng/g (expanded polystyrene panel (EPS)). Relatively high concentrations of OPFRs were found in foam samples, followed by nonwoven and polyvinyl chloride (PVC) wallpaper, PVC pipes, sealing materials, boards, and paints...
September 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28812284/new-nanocomposites-of-polystyrene-with-polyaniline-doped-with-lauryl-sulfuric-acid
#19
A A Pud, O A Nikolayeva, L O Vretik, Yu V Noskov, N A Ogurtsov, O S Kruglyak, E A Fedorenko
This work is concentrated on synthesis and investigation of new core-shell nanocomposites of polystyrene (PS) with doped polyaniline (PANI). The latex containing PS nanoparticles with sizes of 15-30 nm was prepared by microemulsion polymerization of styrene in water media. The PS/PANI nanocomposites were synthesized by chemical oxidative polymerization of aniline in the PS latex media in a presence of lauryl sulfuric acid (LSA), which served as both dopant and plasticizer. The real content of PANI in the synthesized nanocomposites was determined by UV-Vis spectroscopy method...
August 15, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28774152/ultrasensitive-biosensor-for-the-detection-of-vibrio-cholerae-dna-with-polystyrene-co-acrylic-acid-composite-nanospheres
#20
Mahbubur Rahman, Lee Yook Heng, Dedi Futra, Tan Ling Ling
An ultrasensitive electrochemical biosensor for the determination of pathogenic Vibrio cholerae (V. cholerae) DNA was developed based on polystyrene-co-acrylic acid (PSA) latex nanospheres-gold nanoparticles composite (PSA-AuNPs) DNA carrier matrix. Differential pulse voltammetry (DPV) using an electroactive anthraquninone oligonucleotide label was used for measuring the biosensor response. Loading of gold nanoparticles (AuNPs) on the DNA-latex particle electrode has significantly amplified the faradaic current of DNA hybridisation...
December 2017: Nanoscale Research Letters
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