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Synthetic colloid

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https://www.readbyqxmd.com/read/29321676/synthesis-of-wurtzite-cu2znsns4-nanosheets-with-exposed-high-energy-002-facets-for-fabrication-of-efficient-pt-free-solar-cell-counter-electrodes
#1
Xiaoyan Zhang, You Xu, Junjie Zhang, Shuai Dong, Liming Shen, Arunava Gupta, Ningzhong Bao
Two-dimensional (2D) semiconducting nanomaterials have generated much interest both because of fundamental scientific interest and technological applications arising from the unique properties in two dimensions. However, the colloidal synthesis of 2D quaternary chalcogenide nanomaterials remains a great challenge owing to the lack of intrinsic driving force for its anisotropic growth. 2D wurtzite Cu2ZnSnS4 nanosheets (CZTS-NS) with high-energy (002) facets have been obtained for the first time via a simple one-pot thermal decomposition method...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29319455/modification-characterization-and-investigations-of-key-factors-controlling-the-transport-of-modified-nano-zero-valent-iron-nzvi-in-porous-media
#2
Amal Krishna Saha, Alok Sinha, Srinivas Pasupuleti
Enhancement of nZVI stability and transport in the sub-surface environment is important for in situ degradation of contaminants. Various biodegradable dispersants (PAA, Tween20 and Reetha Extracts) have been tested to evaluate their effectiveness in this regard. Application of dispersants during synthesis of nZVI have positively affected the reduction in particle size. The transport capacity in terms of fraction elution at different pore water velocities and collector grain size (filter media), were analyzed using correlation equation for filtration model by Rajagopalan and Tien (RT model)...
January 10, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29315469/changes-in-colloid-solution-sales-in-nordic-countries
#3
U E Kongsgaard, A Holtan, A Perner
BACKGROUND: Administration of resuscitation fluid is a common intervention in the treatment of critically ill patients, but the right choice of fluid is still a matter of debate. Changes in medical practice are based on new evidence and guidelines as well as traditions and personal preferences. Official warnings against the use of hydroxyl-ethyl-starch (HES) solutions have been issued. Nordic guidelines have issued several strong recommendations favouring crystalloids over colloids in all patient groups...
January 7, 2018: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29304444/influence-of-nanoparticle-doping-on-the-colloidal-stability-and-toxicity-of-copper-oxide-nanoparticles-in-synthetic-and-natural-waters
#4
Adeyemi S Adeleye, Suman Pokhrel, Lutz Mädler, Arturo A Keller
Engineered nanoparticles (NPs) are often doped with other elements to improve their functionality and, at times, physical and/or chemical stability. However, the effect of doping on the environmental implications of NPs is not well-understood. We investigated the colloidal stability and effects of CuO NPs doped with Fe (0-10%). Colloidal stability of the Fe-doped CuO NPs in aqueous media, as determined by critical coagulation concentrations of NaCl, decreased with increased Fe-doping. However, decrease in the overall particle density led to slower sedimentation of Fe-doped CuO NPs than would have been predicted from their aggregation behavior...
December 28, 2017: Water Research
https://www.readbyqxmd.com/read/29299582/facile-synthesis-of-carbon-quantum-dots-loaded-with-mesoporous-g-c3n4-for-synergistic-absorption-and-visible-light-photodegradation-of-fluoroquinolone-antibiotics
#5
Yingfei Wang, Fengliang Wang, Yiping Feng, Zhijie Xie, Qianxin Zhang, Xiaoyu Jin, Haijin Liu, Yang Liu, Wenying Lv, Guoguang Liu
The development of facile and efficient synthetic approaches of carbon quantum dots loaded with mesoporous g-C3N4 (mpg-C3N4/CQDs) is of critical urgency. Here, a facile strategy was developed to synthesize the mpg-C3N4/CQDs by using calcinations of the mixture of CQDs, cyanamide, and silica colloid. The obtained composite still retained a considerable total surface area, which could offer a larger population of adsorption sites; therefore enhance the capacity for the adsorption of fluoroquinolones antibiotics (FQs)...
January 4, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29282985/chemical-structure-ensemble-and-single-particle-spectroscopy-of-thick-shell-inp-znse-quantum-dots
#6
Kemar R Reid, James R McBride, Nathaniel J Freymeyer, Lucas B Thal, Sandra J Rosenthal
Thick-shell (> 5 nm) InP-ZnSe colloidal quantum dots (QDs) grown by a continuous-injection shell growth process are reported. The growth of a thick crystalline shell is attributed to the high temperature of the growth process and the relatively low lattice mismatch between the InP core and ZnSe shell. In addition to a narrow ensemble photoluminescence (PL) line-width (~ 40 nm), ensemble and single particle emission dynamics measurements indicate that blinking and Auger recombination are reduced in these heterostructures...
December 28, 2017: Nano Letters
https://www.readbyqxmd.com/read/29280311/fluorination-enhances-serum-stability-of-bioreducible-poly-amido-amine-polyplexes-and-enables-efficient-intravenous-sirna-delivery
#7
Gang Chen, Kaikai Wang, Yixin Wang, Pengkai Wu, Minjie Sun, David Oupický
The use of small interfering RNA (siRNA) in cancer treatment has been limited by the lack of effective systemic delivery methods. Although synthetic polycations have been widely explored in siRNA delivery, polycation/siRNA polyplexes often suffer from insufficient stability in vivo. Here, rationally designed siRNA delivery systems that meet the requirements for systemic siRNA delivery to distant tumors are reported. The hypothesis that modular design of delivery systems based on poly(amido amine)s that combine fluorination for systemic stability with bioreducibility for easy intracellular siRNA release, and PEGylation for improved safety and colloidal stability will overcome problems with contradicting siRNA delivery demands is tested...
December 27, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29277987/bioinspired-manganese-chelated-alginate-poly-dopamine-nanomaterials-for-efficient-in-vivo-t1%C3%A2-weighted-magnetic-resonance-imaging-mri
#8
Kefyalew Dagnew Addisu, Balkew Zewge Hailemeskel, Shewaye Lakew Mekuria, Abegaz Tizazu Andrgie, Yu-Chun Lin, Hsieh-Chih Tsai
Manganese-based nanomaterials are an emerging new class of magnetic resonance imaging (MRI) contrast agents (CAs) that provide impressive contrast abilities. MRI CAs that can respond to pathophysiological parameters like pH or redox potential are also highly demanded for MRI guided tumor diagnosis. Until now, synthesizing nanomaterials with good biocompatibility, physio-chemical stability, and good contrast effects remain challenging. This study investigated two new systems of calcium/manganese cations complexed with either alginate-polydopamine or alginate-dopamine nanogels (AlgPDA(Ca/Mn) NG or AlgDA (Ca/Mn) NG)...
December 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29261592/whole-blood-and-hextend-bookends-of-modern-tactical-combat-casualty-care-field-resuscitation-and-starting-point-for-multi-functional-resuscitation-fluid-development
#9
Forest R Sheppard, Thomas A Mitchell, Antoni R Macko, Darren M Fryer, Leasha J Schaub, Kassandra M Ozuna, Jacob J Glaser
BACKGROUND: Hemorrhage is the leading cause of preventable death in traumatically injured civilian and military populations. Pre-hospital resuscitation largely relies on crystalloid and colloid intra-vascular expansion, as whole blood and component blood therapy are logistically arduous. In this experiment, we evaluated the bookends of Tactical Combat Casualty Care Guidelines recommendations of pre-hospital resuscitation with Hextend and whole blood in a controlled hemorrhagic shock model within non-human primates, as means of a multi-functional resuscitative fluid development...
December 20, 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29248847/investigation-of-micromechanical-properties-of-hard-sphere-filled-composite-hydrogels-by-atomic-force-microscopy-and-finite-element-simulations
#10
Guanlin Tang, Massimiliano Galluzzi, Chandra Sekhar Biswas, Florian J Stadler
Atomic force microscopy (AFM) indentation is the most suitable way to characterize micromechanical properties of soft materials such as bio tissues. However, the mechanical data obtained from force-indentation measurement are still not well understood due to complex geometry of the bio tissue, nonlinearity of indentation contact, and constitutive relation of hyperelastic soft material. Poly-N-isopropyl acrylamide (PNIPAM) filled with 5wt% polystyrene (PS) sphere particles material system can be utilized as a simplified model for mimicking a whole host of soft materials...
October 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29240414/trace-element-removal-in-distributed-drinking-water-treatment-systems-by-cathodic-h2o2-production-and-uv-photolysis
#11
James M Barazesh, Carsten Prasse, Jannis Wenk, Stephanie Berg, Christina K Remucal, David L Sedlak
As water scarcity intensifies, point-of-use and point-of-entry treatment may provide a means of exploiting locally available water resources that are currently considered to be unsafe for human consumption. Among the different classes of drinking water contaminants, toxic trace elements (e.g., arsenic and lead) pose substantial operational challenges for distributed drinking water treatment systems. Removal of toxic trace elements via adsorption onto iron oxides is an inexpensive and robust treatment method; however, the presence of metal-complexing ligands associated with natural organic matter (NOM) often prevents the formation of iron precipitates at the relatively low concentrations of dissolved iron typically present in natural water sources, thereby requiring the addition of iron which complicates the treatment process and results in a need to dispose of relatively large amounts of accumulated solids...
December 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29237375/adhesive-drug-delivery-systems-based-on-polyelectrolyte-complex-nanoparticles-pec-np-for-bone-healing
#12
Martin Muller, David Vehlow, Bernhard Torger, Birgit Urban
BACKGROUND: In this contribution an overview is given on own work concerning drug loaded polyelectrolyte complex (PEC) nanoparticles (NP) used to functionalize bone substitute materials (BSM) for the therapy of bone defects associated with systemic bone diseases. In this context drug loaded PEC NP have certain advantages, which are exemplarily summarized herein. METHODS: Concerning preparative methods PEC NP were fabricated by controlled mixing of polycation and polyanion solutions and integration of charged drugs during and after mixing...
December 12, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29235837/monodisperse-palladium-sulphide-as-efficient-electrocatalyst-for-oxygen-reduction-reaction
#13
Cheng Du, Peng Li, Fulin Yang, Gongzhen Cheng, Shengli Chen, Wei Luo
In this paper, we report a colloidal synthesis of palladium sulphides (including Pd16S7, Pd4S, and PdS) via a facile one-pot hot-solution synthetic route and their promising application as electrocatalyst for the oxygen reduction reaction (ORR). Among the different palladium sulfides tested, monodisperse Pd4S nanoparticles exhibit the best electrocatalytic activity toward ORR in alkaline medium, with the half-wave potential which is ca.47 mV more positive than that of the state-of-the-art Pt/C catalyst. Density functional theory (DFT) calculations indicate the existence of oxygen absorption sites in Pd4S surface result in optimized oxygen binding ability for the 4-electron oxygen reduction...
December 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29233976/uncovering-active-precursors-in-colloidal-quantum-dot-synthesis
#14
Leah C Frenette, Todd D Krauss
Studies of the fundamental physics and chemistry of colloidal semiconductor nanocrystal quantum dots (QDs) have been central to the field for over 30 years. Although the photophysics of QDs has been intensely studied, much less is understood about the underlying chemical reaction mechanism leading to monomer formation and subsequent QD growth. Here we investigate the reaction mechanism behind CdSe QD synthesis, the most widely studied QD system. Remarkably, we find that it is not necessary for chemical precursors used in the most common synthetic methods to directly react to form QD monomers, but rather they can generate in situ the same highly reactive Cd and Se precursors that were used in some of the original II-VI QD syntheses decades ago, i...
December 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/29227097/interfacial-antioxidants-a-review-of-natural-and-synthetic-emulsifiers-and-co-emulsifiers-that-can-inhibit-lipid-oxidation
#15
David Julian McClements, Eric A Decker
There has been strong interest in developing effective strategies to inhibit lipid oxidation in emulsified food products due to the need to incorporate oxidatively labile bioactive lipids, such as w-3 fatty acids, conjugated linoleic acids, or carotenoids. Emulsifiers or co-emulsifiers can be utilized to inhibit lipid oxidation in emulsions. Both of these molecular types can adsorb to droplet surfaces and inhibit lipid oxidation, but emulsifiers can also stabilize droplets against aggregation whereas co-emulsifiers cannot...
December 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29219326/boosting-the-efficiency-of-quantum-dot-sensitized-solar-cells-through-formation-of-cation-exchanged-hole-transporting-layer
#16
Sourav Maiti, Farazuddin Azlan, Pranav Anand, Yogesh Jadhav, Jayanta Dana, Santosh K Haram, Hirendra N Ghosh
In search of a viable way to enhance the power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSSC) we have designed a method by introducing a hole transporting layer (HTL) of p-type CuS through partial cation exchange process in post synthetic ligand assisted assembly of nanocrystals (NCs). High quality CdSe and CdSSe gradient alloy NCs were synthesized through colloidal method and the charge carrier dynamics was monitored through ultrafast transient absorption (TA) measurements. Notable increase in the short circuit current concomitant with the increase in open circuit voltage and fill factor lead to 45% increment in PCE for CdSe based solar cell upon formation of the CuS HTL...
December 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29216714/fabrication-of-hyperbranched-block-statistical-copolymer-based-prodrug-with-dual-sensitivities-for-controlled-release
#17
Luping Zheng, Yunfei Wang, Xianshuo Zhang, Liwei Ma, Baoyan Wang, Xiangling Ji, Hua Wei
Dendrimer with hyperbranched structure and multivalent surface is regarded as one of the most promising candidates close to the ideal drug delivery systems, but the clinical translation and scale-up production of dendrimer has been hampered significantly by the synthetic difficulties. Therefore there is considerable scope for the development of novel hyperbranched polymer that can not only address the drawbacks of dendrimer but maintain its advantages. The reversible addition-fragmentation chain transfer self-condensing vinyl polymerization (RAFT-SCVP) technique has enabled facile preparation of segmented hyperbranched polymer (SHP) by using chain transfer monomer (CTM)-based double-head agent during the past decade...
December 7, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29196659/rational-design-and-dynamics-of-self-propelled-colloidal-bead-chains-from-rotators-to-flagella
#18
Hanumantha Rao Vutukuri, Bram Bet, René van Roij, Marjolein Dijkstra, Wilhelm T S Huck
The quest for designing new self-propelled colloids is fuelled by the demand for simple experimental models to study the collective behaviour of their more complex natural counterparts. Most synthetic self-propelled particles move by converting the input energy into translational motion. In this work we address the question if simple self-propelled spheres can assemble into more complex structures that exhibit rotational motion, possibly coupled with translational motion as in flagella. We exploit a combination of induced dipolar interactions and a bonding step to create permanent linear bead chains, composed of self-propelled Janus spheres, with a well-controlled internal structure...
December 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29192141/colloidal-shuttles-for-programmable-cargo-transport
#19
Ahmet F Demirörs, Fritz Eichenseher, Martin J Loessner, André R Studart
The active transport of cargo molecules within cells is essential for life. Developing synthetic strategies for cargo control in living or inanimate thermal systems could lead to powerful tools to manipulate chemical gradients at the microscale and thus drive processes out of equilibrium to realize work. Here we demonstrate a colloidal analog of the complex biological shuttles responsible for molecular trafficking in cells. Our colloidal shuttles consist of magneto-dielectric particles that are loaded with cargo particles or living cells through size-selective dielectrophoretic trapping using electrical fields...
November 30, 2017: Nature Communications
https://www.readbyqxmd.com/read/29176062/sol-gel-tio2-colloidal-suspensions-and-nanostructured-thin-films-structural-and-biological-assessments
#20
Elsa Quartapelle Procopio, Valentina Colombo, Nadia Santo, Angelo Sironi, Cristina Lenardi, Daniela Maggioni
The role of the substrate topography in phenotypes expression of in-vitro cultured cells has been widely assessed. However, the production of nanostructured interface via deposition of sol-gel synthetized nanoparticles has not yet fully exploited. This is also argued by the limited number of studies correlating the morphological, structural and chemical properties of the grown thin films with those of the sol-gel "brick" within the framework of the bottom-up approach. Our work intends to contribute to go beyond this drawback presenting an accurate investigation of sol-gel TiO2 nanoparticles shaped as spheres and rods...
November 23, 2017: Nanotechnology
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