keyword
MENU ▼
Read by QxMD icon Read
search

Colloids

keyword
https://www.readbyqxmd.com/read/29149728/tuning-magnetic-relaxation-properties-of-hard-cores-in-core-shell-colloids-by-modification-of-soft-shell
#1
Nataliya Shamsutdinova, Rustem Zairov, Irek Nizameev, Aidar Gubaidullin, Alsu Mukhametshina, Sergey Podyachev, Ildus Ismayev, Marsil Kadirov, Alexandra Voloshina, Timur Mukhametzyanov, Asiya Mustafina
The present work introduces an impact of polyelectrolyte-based hydrophilic shell on magnetic relaxivity and luminescence of hard cores built from isostructural complexes of Tb(III) and Gd(III) in the core-shell aqueous colloids. Microscopic and scattering techniques reveal "plum pudding" morphology of the colloids, where polyelectrolyte-coated ultrasmall (<5nm) hard cores form aggregates in aqueous solutions. Interaction of bovine serum albumin (BSA) with the colloids provides a tool to modify the polyelectrolyte-based shell, which is the reason for the improvement in both aggregation behavior of the colloids and their relaxivity...
November 11, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29149704/gold-nanoparticles-as-an-adjuvant-influence-of-size-shape-and-technique-of-combination-with-cpg-on-antibody-production
#2
Lev A Dykman, Sergey A Staroverov, Alexander S Fomin, Vitaly A Khanadeev, Boris N Khlebtsov, Vladimir A Bogatyrev
Gold nanoparticles (GNPs) are advantageous as an adjuvant in the design of effective vaccines and in the preparation of high-affinity antibodies to haptens and complete antigens. Another method of activating immunocompetent cells with colloidal gold is to conjugate GNPs with CpG oligodeoxynucleotides (ODNs). We examined how the size and shape of GNPs and various combinations of GNPs and CpG ODNs 1826 affect the immune response. When animals were injected with a model antigen (BSA) coupled to gold nanospheres (diameters, 15 and 50nm), nanorods, nanoshells, and nanostars, the titers of the resultant antibodies differed substantially...
November 14, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/29149433/predictive-values-of-pulse-pressure-variation-and-stroke-volume-variation-for-fluid-responsiveness-in-patients-with-pneumoperitoneum
#3
Marko Zlicar, Vesna Novak-Jankovic, Rok Blagus, Maurizio Cecconi
Animal studies suggest that dynamic predictors remain useful in patients with pneumoperitoneum, but human data is conflicting. Our aim was to determine predictive values of pulse pressure variation (PPV) and stroke volume variation (SVV) in patients with pneumoperitoneum using LiDCORapid™ haemodynamic monitor. Standardised fluid challenges of colloid were administered to patients undergoing laparoscopic procedures, one fluid challenge per patient. Intra-abdominal pressure was automatically held at 12 mmHg...
November 17, 2017: Journal of Clinical Monitoring and Computing
https://www.readbyqxmd.com/read/29149229/van-t-hoff-s-law-for-active-suspensions-the-role-of-the-solvent-chemical-potential
#4
Jeroen Rodenburg, Marjolein Dijkstra, René van Roij
We extend Van't Hoff's law for the osmotic pressure to a suspension of active Brownian particles. The propelled particles exert a net reaction force on the solvent, and thereby either drive a measurable solvent flow from the connecting solvent reservoir through the semipermeable membrane, or increase the osmotic pressure and cause the suspension to rise to heights as large as micrometers for experimentally realized microswimmers described in the literature. The increase in osmotic pressure is caused by the background solvent being, in contrast to passive suspensions, no longer at the chemical potential of the solvent reservoir...
November 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/29148778/ligand-mediated-deposition-of-noble-metals-at-nanoparticle-plasmonic-hotspots
#5
Patrick J Straney, Nathan A Diemler, Ashley M Smith, Zachary E Eddinger, Matthew S Gilliam, Jill E Millstone
We report the use of gold nanoparticle surface chemistry as a tool for site-selective noble metal deposition onto colloidal gold nanoparticle substrates. Specifically, we demonstrate that partial passivation of the gold nanoparticle surface using thiolated ligands can induce a transition from linear palladium island deposition to growth of palladium selectively at plasmonic hotspots on the edges or vertices of the underlying particle substrate. Further, we demonstrate the broader applicability of this approach with respect to substrate morphology (e...
November 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29148751/correction-to-structure-of-colloidal-quantum-dots-from-dynamic-nuclear-polarization-surface-enhanced-nmr-spectroscopy
#6
Laura Piveteau, Ta-Chung Ong, Aaron J Rossini, Lyndon Emsley, Christophe Copéret, Maksym V Kovalenko
No abstract text is available yet for this article.
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148709/nir-emitting-nanoprobes-based-on-cyclic-rgd-motif-conjugated-pbs-quantum-dots-for-integrin-targeted-optical-bioimaging
#7
Nicoletta Depalo, Michela Corricelli, Ivan de Paola, Gianpiero Valente, Rosa M Iacobazzi, Emiliano Altamura, Doriana Debellis, Daniela Comegna, Elisabetta Fanizza, Nunzio Denora, Valentino Laquintana, Fabio Mavelli, Marinella Striccoli, Michele Saviano, Angela Agostiano, Annarita Del Gatto, Laura Zaccaro, Maria Lucia Curri
Here, silica coated PbS quantum dots (QDs) with photoluminesce emission properties in the near-infrared (NIR) region are proposed as potential effective single particle optical nanoprobes for future in vivo imaging of tumors. The dispersibility in aqueous medium of hydrophobic PbS QDs was accomplished by growing a silica shell on their surface by exploiting a base assisted water-in-oil microemulsion method. The silica coated PbS QDs were then conjugated with specifically designed cyclic arginine-glycine-aspartic acid (cRGD) peptide, that are able to specifically recognizes the αvβ3 integrins which is overexpressed in the angiogenic tumor induced vasculatures and on some solid tumours, in order to achieve a tumor-specific targeting...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148097/ce3-sensitized-tm3-mn2-doped-nayf4-colloidal-nanocrystals-intense-cool-white-light-from-phosphor-coated-uv-led
#8
Venkataramanan Mahalingam, Venkata N K B Adusumalli, Heramba V S R M Koppisetti
Intense white light emission is observed from colloidal single component NaYF4:Ce3+/Tm3+/Mn2+ nanocrystals. This combination is interesting as it uses Mn2+ ions instead of green and red emitting Ln3+ ions which are expensive and less abundant. The single band blue emission of Tm3+ ions was combined with the broadband greenish yellow emission of Mn2+ ions to produce strong white light emission using Ce3+ ions as excitation source. Interestingly, there is hardly any re-absorption of blue emission by Mn2+ ions and the spectrum matches the commercial Ce3+-doped YAG phosphor coated over blue LED...
November 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29147985/deciphering-the-growth-organic-acid-exudations-and-ionic-homeostasis-of-amaranthus-viridis-l-and-portulaca-oleracea-l-under-lead-chloride-stress
#9
Muhammad Tariq Javed, Muhammad Sohail Akram, Noman Habib, Kashif Tanwir, Qasim Ali, Nabeel Khan Niazi, Huma Gul, Naeem Iqbal
Lead (Pb) stress adversely affects in planta nutrient homeostasis and metabolism when present at elevated concentration in the surrounding media. The present study was aimed at investigation of organic acid exudations, elemental contents, growth, and lipid peroxidation in two wild plants (Amaranthus viridis L. and Portulaca oleracea L.), exhibiting differential root to shoot Pb translocation, under Pb stress. Plants were placed in soil spiked with lead chloride (PbCl2) concentrations of 0, 15, 30, 45, or 60 mg Pb/kg soil, in rhizoboxes supplied with nylon nets around the roots...
November 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29147679/dense-fluidized-granular-media-in-microgravity
#10
Philip Born, Johannes Schmitz, Matthias Sperl
Handling and transport of granular media are inevitably governed by the settling of particles. Settling into a dense state is one of the defining characteristics of granular media, among dissipation and absence of thermal agitation. Hence, settling complicates the adaptation of microscopic theories from atomic, molecular, or colloidal media to granular media. It is desirable to provide experiments in which selectively one of the granular characteristics is tuned to test suitable adaptation of a theory. Here we show that gas fluidization of granular media in microgravity is a suitable approach to achieve steady states closer to thermally agitated systems free of settling...
2017: NPJ Microgravity
https://www.readbyqxmd.com/read/29147498/reduction-rate-as-a-quantitative-knob-for-achieving-deterministic-synthesis-of-colloidal-metal-nanocrystals
#11
Tung-Han Yang, Kyle D Gilroy, Younan Xia
Despite the incredible developments made to the synthesis of colloidal metal nanocrystals, it is still challenging to produce them in a reproducible and predictable manner. This drawback can be attributed to the fact that the protocols continue to be built upon qualitative observations and empirical laws. Because of the vast number of intricately entangled experimental parameters in a synthesis, it is almost impossible to predict and control the outcome by knowingly alternating these parameters. In this Perspective article, we discuss the recent efforts in pushing nanocrystal synthesis towards a deterministic process based upon quantitative measurements...
October 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/29147027/trapping-pinning-of-colloidal-microspheres-over-glass-substrate-using-surface-features
#12
Praneet Prakash, Manoj Varma
Suspensions of micro/nano particles made of Polystyrene, Poly(methyl methacrylate), Silicon dioxide etc. have been a standard model system to understand colloidal physics. These systems have proved useful insights into phenomena such as self-assembly. Colloidal model systems are also extensively used to simulate many condensed matter phenomena such as dynamics in a quenched disordered system and glass transition. A precise control of particles using optical or holographic tweezers is essential for such studies...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146971/skin-hydration-interplay-between-molecular-dynamics-structure-and-water-uptake-in-the-stratum-corneum
#13
Enamul Haque Mojumdar, Quoc Dat Pham, Daniel Topgaard, Emma Sparr
Hydration is a key aspect of the skin that influences its physical and mechanical properties. Here, we investigate the interplay between molecular and macroscopic properties of the outer skin layer - the stratum corneum (SC) and how this varies with hydration. It is shown that hydration leads to changes in the molecular arrangement of the peptides in the keratin filaments as well as dynamics of C-H bond reorientation of amino acids in the protruding terminals of keratin protein within the SC. The changes in molecular structure and dynamics occur at a threshold hydration corresponding to ca...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146894/odd-viscosity-in-chiral-active-fluids
#14
Debarghya Banerjee, Anton Souslov, Alexander G Abanov, Vincenzo Vitelli
We study the hydrodynamics of fluids composed of self-spinning objects such as chiral grains or colloidal particles subject to torques. These chiral active fluids break both parity and time-reversal symmetries in their non-equilibrium steady states. As a result, the constitutive relations of chiral active media display a dissipationless linear-response coefficient called odd (or equivalently, Hall) viscosity. This odd viscosity does not lead to energy dissipation, but gives rise to a flow perpendicular to applied pressure...
November 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/29145770/camptothecin-prodrug-nanomicelle-based-on-a-boronate-ester-linked-diblock-copolymer-as-the-carrier-of-doxorubicin-with-enhanced-cellular-uptake
#15
Ya Gao, Yi Xiao, Shiyuan Liu, Jiahui Yu
A novel pH-sensitive polymeric prodrug of camptothecin (CPT) by polymerizing γ-camptothecin-glutamate N-carboxyanhydride (Glu (CPT)-NCA) on boronate ester-linked poly (ethyleneglycol) (PEG) directly via the amine-initiated ring open polymerization (ROP) has been developed. The resulting amphiphilic prodrug (mPEG-BC-PGluCPT) could self-assemble into nanoparticles and encapsulate doxorubicin (Dox) simultaneously in aqueous solution for dual-drug delivery. The formation of polymeric prodrug micelles (mPEG-BC@PGluCPT) was confirmed by the measurements of critical aggregation concentration (CAC), particle size, and morphology observations...
November 17, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29144759/degree-of-unsaturation-and-backbone-orientation-of-amphiphilic-macromolecules-influence-local-lipid-properties-in-large-unilamellar-vesicles
#16
Kathryn E Uhrich, Alysha Moretti, Bin Zhang, Bernice Lee, Meenakshi Dutt
Liposomes have become increasingly common in the delivery of bioactive agents due to their ability to encapsulate hydrophobic and hydrophilic drugs with excellent biocompatibility. While commercial liposome formulations improve bioavailability of otherwise quickly eliminated or insoluble drugs, tailoring formulation properties for specific uses has become a focus of liposome research. Here, we report the design, synthesis, and characterization of two series of amphiphilic macromolecules (AMs), consisting of acylated polyol backbones conjugated to poly(ethylene glycol) (PEG) that can serve as the sole additives to stabilize and control hydrophilic molecule release rates from distearoyl-phosphatidylcholine- (DSPC-) based liposomes...
November 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29144733/a-mechanism-for-symmetry-breaking-and-shape-control-in-single-crystal-gold-nanorods
#17
Michael J Walsh, Wenming Tong, Hadas Katz-Boon, Paul Mulvaney, Joanne Etheridge, Alison M Funston
The phenomenon of symmetry breaking-in which the order of symmetry of a system is reduced despite manifest higher-order symmetry in the underlying fundamental laws-is pervasive throughout science and nature, playing a critical role in fields ranging from particle physics and quantum theory to cosmology and general relativity. For the growth of crystals, symmetry breaking is the crucial step required to generate a macroscopic shape that has fewer symmetry elements than the unit cell and/or seed crystal from which it grew...
November 16, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29144732/ratiometric-detection-of-intracellular-lysine-and-ph-with-one-pot-synthesized-dual-emissive-carbon-dots
#18
Wei Song, Wenxiu Duan, Yinghua Liu, Zhongju Ye, Yonglei Chen, Hongli Chen, Shengda Qi, Jiang Wu, Dan Liu, Lehui Xiao, Cuiling Ren, Xingguo Chen
Recently, the development of new fluorescent probes for the ratiometric detection of target objects inside living cells has received great attention. Normally, the preparation, modification as well as conjugation procedures of these probes are complicated. On this basis, great efforts have been paid to establish convenient method for the preparation of dual emissive nanosensor. In this work, a functional dual emissive carbon dots (dCDs) was prepared by a one-pot hydrothermal carbonization method. The dCDs exhibits two distinctive fluorescence emission peaks at 440 and 624 nm with the excitation at 380 nm...
November 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29144529/driving-dynamic-colloidal-assembly-using-eccentric-self-propelled-colloids
#19
Zhan Ma, Qun-Li Lei, Ran Ni
Designing protocols to dynamically direct the self-assembly of colloidal particles has become an important direction in soft matter physics because of promising applications in the fabrication of dynamic responsive functional materials. Here, using computer simulations, we found that in the mixture of passive colloids and eccentric self-propelled active particles, when the eccentricity and self-propulsion of active particles are high enough, the eccentric active particles can push passive colloids to form a large dense dynamic cluster, and the system undergoes a novel dynamic demixing transition...
November 16, 2017: Soft Matter
https://www.readbyqxmd.com/read/29144523/protein-templated-gold-nanoparticle-synthesis-protein-organization-controlled-gold-sequestration-and-unexpected-reaction-products
#20
Cassidy Hart, Nouf Abuladel, Madeleine Bee, Megan C Kreider, Alexander C CVitan, Moira M Esson, Andrew Farag, Trisha Ibeh, Eleni N Kalivas, Daniel-Mario Larco, Andrew Walker Long, Loukas Lymperopoulos, Zachary Mendel, Nancy Miles, Carly M Zareba, James C Schwabacher, Helen Slucher, Javier Vinals, John M Heddleston, Wenyue Li, Douglas M Fox, Matthew R Hartings
Emerging applications that exploit the properties of nanoparticles for biotechnology require that the nanoparticles be biocompatible or support biological recognition. These types of particles can be produced through syntheses that involve biologically relevant molecules (proteins or natural extracts, for example). Many of the protocols that rely on these molecules are performed without a clear understanding of the mechanism by which the materials are produced. We have investigated a previously described reaction in which gold nanoparticles are produced from the reaction of chloroauric acid and proteins in solution...
November 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
keyword
keyword
4248
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"