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https://www.readbyqxmd.com/read/28211741/enhanced-crystal-growth-in-binary-lennard-jones-mixtures
#1
M Radu, K Kremer
We study the crystal growth in binary Lennard-Jones mixtures by molecular dynamics simulations. Growth dynamics, the structure of the liquid-solid interfaces as well as droplet incorporation into the crystal vary with solution properties. For demixed systems we observe a strongly enhanced crystal growth at the cost of enclosed impurities. Furthermore, we find different interface morphologies depending on solubility. We relate our observations to growth mechanisms based on the Gibbs-Thomson effect as well as to predictions of the Kardar-Parisi-Zhang theory in 2+1 dimensions...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28211468/long-lasting-solid-lubrication-by-cnt-coated-patterned-surfaces
#2
L Reinert, F Lasserre, C Gachot, P Grützmacher, T MacLucas, N Souza, F Mücklich, S Suarez
The use of lubricants (solid or liquid) is a well-known and suitable approach to reduce friction and wear of moving machine components. Another possibility to influence the tribological behaviour is the formation of well-defined surface topographies such as dimples, bumps or lattice-like pattern geometries by laser surface texturing. However, both methods are limited in their effect: surface textures may be gradually destroyed by plastic deformation and lubricants may be removed from the contact area, therefore no longer properly protecting the contacting surfaces...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28202966/stable-colloids-in-molten-inorganic-salts
#3
Hao Zhang, Kinjal Dasbiswas, Nicholas B Ludwig, Gang Han, Byeongdu Lee, Suri Vaikuntanathan, Dmitri V Talapin
A colloidal solution is a homogeneous dispersion of particles or droplets of one phase (solute) in a second, typically liquid, phase (solvent). Colloids are ubiquitous in biological, chemical and technological processes, homogenizing highly dissimilar constituents. To stabilize a colloidal system against coalescence and aggregation, the surface of each solute particle is engineered to impose repulsive forces strong enough to overpower van der Waals attraction and keep the particles separated from each other...
February 15, 2017: Nature
https://www.readbyqxmd.com/read/28202730/liquid-behavior-of-cross-linked-actin-bundles
#4
Kimberly L Weirich, Shiladitya Banerjee, Kinjal Dasbiswas, Thomas A Witten, Suriyanarayanan Vaikuntanathan, Margaret L Gardel
The actin cytoskeleton is a critical regulator of cytoplasmic architecture and mechanics, essential in a myriad of physiological processes. Here we demonstrate a liquid phase of actin filaments in the presence of the physiological cross-linker, filamin. Filamin condenses short actin filaments into spindle-shaped droplets, or tactoids, with shape dynamics consistent with a continuum model of anisotropic liquids. We find that cross-linker density controls the droplet shape and deformation timescales, consistent with a variable interfacial tension and viscosity...
February 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28193063/electrochemical-impedance-spectroscopy-in-a-droplet-of-solution-for-the-investigation-of-liquid-solid-interface
#5
Camila Molena de Assis, Thu Huong Ho, Hercilio Gomes de Melo, Michel Keddam, Mireille Turmine, Vincent Vivier
The local electrochemical behavior of a solid-liquid interface can be studied by electrochemical impedance spectroscopy (EIS). The investigated surface area can be delimited by adding a drop of solution, which forms an interface between the liquid drop and the working electrode, and performing the measurements inside. The size of the drop must be sufficiently small for a simultaneous wettability characterization (from the contact angle measurement) and appropriately large so that wettability is not influenced by the presence of the working and the counter electrode inserted in the droplet...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28192362/forced-ammonia-stripping-from-livestock-wastewater-the-influence-of-some-physico-chemical-parameters-of-the-wastewater
#6
Giorgos Markou, Miranda Agriomallou, Dimitris Georgakakis
In highly alkaline aqueous solutions (pH >10), the main form of dissolved ammoniacal nitrogen is the unionized free ammonia. Free ammonia, being a gaseous molecule, is easily stripped out from the solution. Increasing wastewater pH is frequently used to force ammonia removal. Herein, the effect of the variation of some physico-chemical characteristics of liquid cattle wastewater on ammonia stripping was investigated. The results show that at pH 11.5, ammonia volatilization and consequently its removal through stripping, was not affected by the variation of total solids (1-10%), alkalinity (2,500-20,000 mg/L as CaCO3) and electrical conductivity (20-50 mS/cm), or by the alkali type (NaOH, KOH and Ca(OH)2) employed to increase pH...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28190596/facile-and-fast-preparation-of-low-cost-silica-supported-graphitic-carbon-nitride-for-solid-phase-extraction-of-fluoroquinolone-drugs-from-environmental-waters
#7
Andrea Speltini, Federica Maraschi, Roberta Govoni, Chiara Milanese, Antonella Profumo, Lorenzo Malavasi, Michela Sturini
The analytical application of silica-supported graphitic carbon nitride (g-C3N4@silica) for solid-phase extraction (SPE) of fluoroquinolone (FQ) pollutants from water is presented for the first time. g-C3N4@silica was easily and quickly prepared by one-pot thermal condensation of dicyandiamide and characterized by powder X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, Fourier transform infrared spectroscopy and surface area measurements. The novel composite was applied as sorbent for SPE of FQs from water prior high-performance liquid chromatography with fluorescence detection...
February 3, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28190595/fractionated-dynamic-headspace-sampling-in-the-analysis-of-matrices-of-vegetable-origin-in-the-food-field
#8
Erica Liberto, Cecilia Cagliero, Chiara Cordero, Patrizia Rubiolo, Carlo Bicchi, Barbara Sgorbini
Recent technological advances in dynamic headspace sampling (D-HS) and the possibility to automate this sampling method have lead to a marked improvement in its the performance, a strong renewal of interest in it, and have extended its fields of application. The introduction of in-parallel and in-series automatic multi-sampling and of new trapping materials, plus the possibility to design an effective sampling process by correctly applying the breakthrough volume theory, have make profiling more representative, and have enhanced selectivity, and flexibility, also offering the possibility of fractionated enrichment in particular for high-volatility compounds...
February 7, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28190350/kinetics-of-wetting-and-spreading-of-droplets-over-various-substrates
#9
Omid Arjmandi Tash, Nina M Kovalchuk, Anna Trybala, Igor V Kuchin, Victor Starov
There is a substantial increase in the number of publications in the field of wetting and spreading since 2010. This increase in the rate of publications can be attributed to the broader application of wetting phenomena in different new areas. It is impossible to review such huge number of publications, that is, some topics in the field of wetting and spreading are selected to be discussed below. These topics are as follows: (i) hysteresis of contact angle on smooth homogeneous solid surfaces via disjoining/conjoining pressure...
February 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28188646/a-nonarchetypal-5-6-dihydro-2h-pyrano-3-2-g-indolizine-based-solution-solid-dual-emissive-aiegen-with-multicolor-tunability
#10
Ashutosh Raghuvanshi, Ajay K Jha, Ashutosh Sharma, Shahida Umar, Shachi Mishra, Ruchir Kant, Atul Goel
Screening of a chemical library of pyranones and their ring transformed fluorophores led to the discovery of a novel 5,6-dihydro-2H-pyrano[3,2-g]indolizine (DPI) class of the luminogen DPI 7, which exhibited unique solution-solid dual emission (SSDE) behaviour with emission color shift i.e. bright green fluorescence in liquid and strong red emission in the solid state. The AIE mechanism of these luminogens revealed a well-defined set of non-covalent interactions (CH…O and CH…N) particularly blocking the motion of C2-flexure leading to the restriction-of-intramolecular-vibrations (RIV) in the solid state...
February 11, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28183650/monodisperse-selenium-substituted-hydroxyapatite-controllable-synthesis-and-biocompatibility
#11
Jianpeng Sun, Xiaoyan Zheng, Hui Li, Daidi Fan, Zhanping Song, Haixia Ma, Xiufu Hua, Junfeng Hui
Hydroxyapatite (HA) is the major inorganic component of natural bone tissue. As an essential trace element, selenium involves in antioxidation and anticancer of human body. So far, ion-doped hydroxyapatites (HAs) are widely investigated owing to their great applications in field of biomaterial, biological labeling. In this paper, series of monodisperse HA doped with SeO3(2-) (SeHA) was successfully synthesized based on the liquid-solid-solution (LSS) strategy. The obtained samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and energy-dispersive spectrometer (EDS)...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28183023/molecular-dynamics-based-selectivity-for-fast-field-cycling-relaxometry-by-overhauser-and-solid-effect-dynamic-nuclear-polarization
#12
Oliver Neudert, Carlos Mattea, Siegfried Stapf
In the last decade nuclear spin hyperpolarization methods, especially Dynamic Nuclear Polarization (DNP), have provided unprecedented possibilities for various NMR techniques by increasing the sensitivity by several orders of magnitude. Recently, in-situ DNP-enhanced Fast Field Cycling (FFC) relaxometry was shown to provide appreciable NMR signal enhancements in liquids and viscous systems. In this work, a measurement protocol for DNP-enhanced NMR studies is introduced which enables the selective detection of nuclear spin hyperpolarized by either Overhauser effect or solid effect DNP...
January 21, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28181835/irinotecan-encapsulated-double-reverse-thermosensitive-nanocarrier-system-for-rectal-administration
#13
Fakhar Ud Din, Ju Yeon Choi, Dong Wuk Kim, Omer Mustapha, Dong Shik Kim, Raj Kumar Thapa, Sae Kwang Ku, Yu Seok Youn, Kyung Taek Oh, Chul Soon Yong, Jong Oh Kim, Han-Gon Choi
Intravenously administered for the treatment of rectum cancer, irinotecan produces severe side effects due to very high plasma concentrations. A novel irinotecan-encapsulated double reverse thermosensitive nanocarrier system (DRTN) for rectal administration was developed as an alternative. The DRTN was fabricated by dispersing the thermosensitive irinotecan-encapsulated solid lipid nanoparticles (SLN) in the thermosensitive poloxamer solution. Its gel properties, pharmacokinetics, morphology, anticancer activity and immunohistopathology were assessed after its rectal administration to rats and tumor-bearing mice...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28176808/comparative-study-of-the-collective-dynamics-of-proteins-and-inorganic-nanoparticles
#14
Esmael J Haddadian, Hao Zhang, Karl F Freed, Jack F Douglas
Molecular dynamics simulations of ubiquitin in water/glycerol solutions are used to test the suggestion by Karplus and coworkers that proteins in their biologically active state should exhibit a dynamics similar to 'surface-melted' inorganic nanoparticles (NPs). Motivated by recent studies indicating that surface-melted inorganic NPs are in a 'glassy' state that is an intermediate dynamical state between a solid and liquid, we probe the validity and significance of this proposed analogy. In particular, atomistic simulations of ubiquitin in solution based on CHARMM36 force field and pre-melted Ni NPs (Voter-Chen Embedded Atom Method potential) indicate a common dynamic heterogeneity, along with other features of glass-forming (GF) liquids such as collective atomic motion in the form of string-like atomic displacements, potential energy fluctuations and particle displacements with long range correlations ('colored' or 'pink' noise), and particle displacement events having a power law scaling in magnitude, as found in earthquakes...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28170270/real-time-observation-of-li-deposition-on-a-li-electrode-with-operand-atomic-force-microscopy-and-surface-mechanical-imaging
#15
Mitsunori Kitta, Hikaru Sano
Nanoscale investigations of Li deposition on the surface of a Li electrode are crucial to understand the initial mechanism of dendrite growth in rechargeable Li-metal batteries during charging. Here, we studied the initial Li deposition and related protrusion growth processes at the surface of the Li electrode with atomic force microscopy (AFM) in a galvanostatic experiment under operand condition. A flat Li-metal surface prepared by precision cutting a Li-metal wire in electrolyte solution (100 mM LiPF6 in propylene carbonate) was observed with peak-force-tapping mode AFM under an inert atmosphere...
February 7, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28169382/hybrid-photoluminescent-materials-containing-a-benzobisthiazole-core-for-liquid-crystal-and-gel-applications
#16
E Díaz, E Elgueta, S A Sanchez, J Barberá, J Vergara, M Parra, M Dahrouch
Tetra- and hexacatenar amide compounds containing a linear centrosymmetric benzobisthiazole core were synthesized with good yields. These compounds were characterized and their structures confirmed by elemental analysis, and FT-IR, Maldi mass and NMR spectroscopy. All compounds exhibited excellent thermal stability up to 330 °C. The tetracatenar series containing a double substitution in the meta positions did not show mesomorphic behaviour, whereas the hexacatenar and tetracatenar series having a double substitution in the meta and para positions showed liquid crystal properties with optical textures typical of columnar mesophases corroborated by POM analysis...
February 7, 2017: Soft Matter
https://www.readbyqxmd.com/read/28167426/removal-of-pb-ii-and-methylene-blue-from-aqueous-solution-by-magnetic-hydroxyapatite-immobilized-oxidized-multi-walled-carbon-nanotubes
#17
Yaoguang Wang, Lihua Hu, Guangya Zhang, Tao Yan, Liangguo Yan, Qin Wei, Bin Du
Magnetic hydroxyapatite-immobilized oxidized multi-walled carbon nanotubes (mHAP-oMWCNTs), an excellent adsorbent for Pb(II) and methylene blue (MB) removal, was synthesized in the present work. It was characterized by SEM, XRD, FTIR, BET, TGA and zeta potential analysis. mHAP-oMWCNTs displayed better adsorption performance than mHAP, mMWCNTs and HAP-oMWCNTs. The adsorption of Pb(II) and MB mainly depend on the ion-exchange property of HAP and the abundant oxygenic functional groups on oMWCNTs surface. Besides, good magnetic performance of mHAP-oMWCNTs makes it easy to achieve the solid-liquid separation...
January 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28166623/fast-diffusion-of-o2-on-nitrogen-doped-graphene-to-enhance-oxygen-reduction-and-its-application-for-high-rate-zn-air-batteries
#18
Lei-Lei Tian, Jie Yang, Mou-Yi Weng, Rui Tan, Jia-Xin Zheng, Hai-Biao Chen, Quan-Chao Zhuang, Li-Ming Dai, Feng Pan
N-doped graphene (NDG) was investigated for oxygen reduction reaction (ORR) and used as air-electrode catalyst for Zn-air batteries. Electrochemical results revealed a slightly lower kinetic activity but a much larger rate capability for the NDG than commercial 20% Pt/C catalyst. The maximum power density for a Zn-air cell with NDG air cathode reached up to 218 mW cm(-2), which is nearly 1.5 times that of its counterpart with the Pt/C (155 mW cm(-2)). The equivalent diffusion coefficient (DE) of oxygen from electrolyte solution to the reactive sites of NDG was evaluated as about 1...
February 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28162762/anaerobic-digestion-of-hemicellulose-hydrolysate-produced-after-hydrothermal-pretreatment-of-sugarcane-bagasse-in-uasb-reactor
#19
Fernanda Resende Ribeiro, Fabiana Passos, Leandro Vinícius Alves Gurgel, Bruno Eduardo Lobo Baêta, Sérgio Francisco de Aquino
In the context of a sugarcane biorefinery, sugarcane bagasse produced may be pretreated generating a solid and liquid fraction. The solid fraction may be used for 2G bioethanol production, while the liquid fraction may be used to produce biogas through anaerobic digestion. The aim of this study consisted in evaluating the anaerobic digestion performance of hemicellulose hydrolysate produced after hydrothermal pretreatment of sugarcane bagasse. For this, hydrothermal pretreatment was assessed in a continuous upflow anaerobic sludge blanket (UASB) reactor operated at a hydraulic retention time (HRT) of 18...
February 3, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28161957/effect-of-surface-charge-on-the-nanofriction-and-its-velocity-dependence-in-an-electrolyte-based-on-lateral-force-microscopy
#20
Dalei Jing, Yunlu Pan, Dayong Li, Xuezeng Zhao, Bharat Bhushan
The nanofriction between a silicon nitride probe and both a silicon wafer and an octadecyltrichlorosilane (OTS)-coated surface is studied in saline solution by using lateral force microscopy (LFM). The effects of surface charge on the nanofriction in an electrolyte as well as its velocity dependence are studied, while the surface charge at the solid-liquid interface is adjusted by changing the pH value of the electrolyte. The results show that the nanofrictional behavior between the probe and the samples in an electrolyte depends strongly on the surface charge at the solid-liquid interface...
February 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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