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https://www.readbyqxmd.com/read/29165321/interfacial-rheology-of-model-particles-at-liquid-interfaces-and-its-relation-to-bicontinuous-pickering-emulsions
#1
Job H J Thijssen, Jan 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...
November 22, 2017: 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
#2
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...
November 7, 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
#3
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...
November 1, 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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
https://www.readbyqxmd.com/read/28735547/nanoaramid-dressed-latex-particles-the-direct-synthesis-via-pickering-emulsion-polymerization
#14
Chunjie Xie, Teng Qiu, Jinglong Li, Heling Zhang, Xiaoyu Li, Xinlin Tuo
The direct synthesis of polymer microspheres modified by aramid nanofibers (ANFs) is an interesting challenge. This work describes a simple aqueous process to prepare polystyrene (PS)/ANF composite microspheres, where the specific ANF network was "dressed" on PS. ANF was derived from the copolymerization of terephthaloyl chloride, p-phenylene diamine, and methoxypolyethylene glycol and could be dispersed in water stably. We applied the as-synthesized ANF as a Pickering emulsifier in the o/w emulsion of styrene monomer...
August 3, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28723191/highly-enriched-controllable-continuous-aerosol-sampling-using-inertial-microfluidics-and-its-application-to-real-time-detection-of-airborne-bacteria
#15
Jeongan Choi, Seung Chan Hong, Woojin Kim, Jae Hee Jung
We report a novel microfluidic technique for sampling of aerosols into liquids. The two-phase fluid, sampling air and collecting liquid, forms a stratified flow in the curved microchannel. By passing fluids through the curved region, the particles are transferred from air into the liquid phase by the particle centrifugal and drag forces. This microfluidic-based aerosol-into-liquid sampling system, called the MicroSampler, is driven by particle inertial differences. To evaluate the physical particle collection efficiency of the MicroSampler, we used standard polystyrene-latex (PSL) particles ranging in size from 0...
April 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28650093/stable-covalently-photo-crosslinked-poly-ionic-liquid-membrane-with-gradient-pore-size
#16
Alessandro Dani, Karoline Täuber, Weiyi Zhang, Helmut Schlaad, Jiayin Yuan
Porous polyelectrolyte membranes stable in a highly ionic environment are obtained by covalent crosslinking of an imidazolium-based poly(ionic liquid). The crosslinking reaction involves the UV light-induced thiol-ene (click) chemistry, and the phase separation, occurring during the crosslinking step, generates a fully interconnected porous structure in the membrane. The porosity is on the order of the micrometer scale and the membrane shows a gradient of pore size across the membrane cross-section. The membrane can separate polystyrene latex particles of different size and undergoes actuation in contact with acetone due to the asymmetric porous structure...
August 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28554043/salt-induced-polystyrene-latex-flocs-investigated-by-neutron-scattering
#17
Habauka M Kwaambwa, Maja S Hellsing, Matthew J Wasbrough, Markus Bleuel, Adrian R Rennie
Studies with a model system consisting of polystyrene latex particles showed that the protein from seeds of Moringa trees adsorbs to the surface and causes flocculation as unusually dense aggregates. In this study, electrolytes sodium chloride (NaCl), ferric chloride (FeCl3) and aluminium sulfate (Al2(SO4)3) have been used to aggregate model polystyrene particles. The study augments previous work using neutron scattering on the flocculation of polystyrene latex with protein from seeds of Moringa trees that had indicated higher floc dimension, df, values as the concentration of particles increased...
November 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28551526/controlling-adsorption-of-albumin-with-hyaluronan-on-silica-surfaces-and-sulfonated-latex-particles
#18
Ida Berts, Giovanna Fragneto, Lionel Porcar, Maja S Hellsing, Adrian R Rennie
Polysaccharides are known to modify binding of proteins at interfaces and this paper describes studies of these interactions and how they are modified by pH. Specifically, the adsorption of human serum albumin on to polystyrene latex and to silica is described, focusing on how this is affected by hyaluronan. Experiments were designed to test how such binding might be modified under relevant physiological conditions. Changes in adsorption of albumin alone and the co-adsorption of albumin and hyaluronan are driven by electrostatic interactions...
May 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28535028/preparation-of-highly-thermally-conductive-polymer-composite-at-low-filler-content-via-a-self-assembly-process-between-polystyrene-microspheres-and-boron-nitride-nanosheets
#19
Xiongwei Wang, Peiyi Wu
Rational distribution and orientation of boron nitride nanosheets (BNNSs) are very significant for a polymer/BNNS composite to obtain a high thermal conductivity at low filler content. In this paper, a high-performance thermal interface material based on exfoliated BNNSs and polystyrene (PS) microspheres was fabricated by latex blending and subsequent compression molding. In this case, BNNSs and PS microspheres first self-assembled to form the complex microspheres via strong electrostatic interactions between them...
June 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28489347/measurement-of-the-density-of-engineered-silver-nanoparticles-using-centrifugal-fff-tem-and-single-particle-icp-ms
#20
Soheyl Tadjiki, Manuel David Montaño, Shoeleh Assemi, Angela Barber, James Ranville, Ronald Beckett
A methodology has been developed to measure nanoparticle mass and density, by combining centrifugal field-flow fractionation (CeFFF; more commonly called sedimentation FFF or SdFFF) and transmission electron microscopy (TEM). Particle effective mass obtained from CeFFF retention data and particle size obtained from the TEM images were used to calculate the nanoparticle density. The method was initially applied to measure the density of monodispersed polystyrene latex nanoparticles. Measured densities for latex nanoparticles of 160-300 nm in diameter were in the range of 1041-1063 kg m(-3) with standard deviations of 0...
June 6, 2017: Analytical Chemistry
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