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Adsorption

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https://www.readbyqxmd.com/read/29166686/-bone-cement-adhesion-on-ceramic-surfaces-deactivation-of-surfaces-and-as-a-consequence-inefficient-retention-of-knee-prostheses-because-of-adsorption-of-atmospheric-water
#1
Bernd Marx, Philip Kerschbaum, Stephanie Lindlahr, Rudolf Marx, Uwe Reisgen, Dieter Christian Wirtz
Aim CoCrMo alloys are contraindicated for sufferers from allergy. For these patients, uncemented and cemented prostheses made of non-allergenic titanium alloy are indicated. Knee prostheses machined from that alloy, however, may have poor tribological behaviour, especially in contact to UHMWPE inlays. Therefore, high-strength oxide ceramics may be especially suitable for knee replacement in allergy patients with mobile bearing prostheses. For adhesion to bone cement, the ceramic surface only exhibits mechanical retention spots that are less adequate than those with a textured metal surface...
November 22, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29166558/understanding-the-cellular-uptake-of-ph-responsive-zwitterionic-gold-nanoparticles-a-computer-simulation-study
#2
Xuebo Quan, Daohui Zhao, Libo Li, Jian Zhou
Surface functionalization of nanoparticles (NPs) with stealth polymers (e.g., hydrophilic and zwitterionic polymers) has become a common strategy to resist non-specific protein adsorption recently. Understanding the role of surface decoration on NP-biomembrane interactions is of great significance to promote the application of NPs in biomedical fields. Herein, using coarse-grained molecular dynamics (CGMD) simulations, we investigate the interactions between stealth polymer-coated gold nanoparticles (AuNPs) and lipid membranes...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29166117/adsorption-and-conformations-of-lysozyme-and-%C3%AE-lactalbumin-at-a-water-octane-interface
#3
David L Cheung
As proteins contain both hydrophobic and hydrophilic amino acids, they will readily adsorb onto interfaces between water and hydrophobic fluids such as oil. This adsorption normally causes changes in the protein structure, which can result in loss of protein function and irreversible adsorption, leading to the formation of protein interfacial films. While this can be advantageous in some applications (e.g., food technology), in most cases it limits our ability to exploit protein functionality at interfaces...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166089/steric-effect-in-co-oxidation-on-pt-111
#4
Hirokazu Ueta, Mitsunori Kurahashi
We present experimental evidence showing that the rate of CO oxidation on Pt(111) depends strongly on the geometry of an incident O2 molecule. The O2 sticking probability and the CO2 production rate on CO-covered Pt(111) surfaces during the alignment-controlled O2 beam irradiation were simultaneously monitored at a surface temperature of 330 K. The results indicate that, at the translational energy of 0.1-0.2 eV and at the CO coverage of <0.4 monolayers, both O2 adsorption and CO oxidation proceed exclusively when the O2 molecular axis is nearly parallel to the surface...
November 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166071/tunability-of-the-co-adsorption-energy-on-a-ni-cu-surface-site-change-and-coverage-effects
#5
Erik Vesselli, Michele Rizzi, Sara Furlan, Xiangmei Duan, Enrico Monachino, Carlo Dri, Angelo Peronio, Cristina Africh, Paolo Lacovig, Alfonso Baldereschi, Giovanni Comelli, Maria Peressi
The adsorption energy of carbon monoxide on Ni ad-islands and ultra-thin films grown on the Cu(110) surface can be finely tuned via a complex interplay among diffusion, site change mechanisms, and coverage effects. The observed features of CO desorption can be explained in terms of migration of CO molecules from Cu to Ni islands, competition between bridge and on-top adsorption sites, and repulsive lateral adsorbate-adsorbate interactions. While the CO adsorption energy on clean Cu(110) is of the order of 0...
June 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166045/controlling-relative-polymorph-stability-in-soft-porous-crystals-with-a-barostat
#6
Nathan A Mahynski, Vincent K Shen
We use Monte Carlo simulations to investigate the thermodynamic behavior of soft porous crystal (SPC) adsorbents under the influence of an external barostat. We consider SPCs that naturally exhibit polymorphism between crystal forms of two distinct pore sizes. In the absence of barostatting, these crystals may be naturally divided into two categories depending on their response to stress applied by the adsorbate fluid: those which macroscopically deform and change the volume of their unit cell ("breathing") and those which instead undergo internal rearrangements that change the adsorbate-accessible volume without modifying the unit cell volume ("gate-opening")...
June 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29166032/combined-cononsolvency-and-temperature-effects-on-adsorbed-pnipam-microgels
#7
Sebastian Backes, Patrick Krause, Weronika Tabaka, Marcus U Witt, Regine von Klitzing
The present study adresses the multi-responsive behavior of Poly(N-isopropylacrylamide) (PNIPAM) microgels adsorbed to interfaces. The microgels react to changes in temperature by shrinking in aqueous solution above their volume phase transition temperature (VPTT). Additionally, they shrink in mixtures of water and ethanol, although both individual liquids are good solvents for PNIPAM. The combination of this so-called cononsolvency effect and the temperature response of adsorbed microgels is studied by atomic force microscopy (AFM)...
November 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29166014/probing-the-surface-of-platinum-during-the-hydrogen-evolution-reaction-in-alkaline-electrolyte
#8
Kelsey A Stoerzinger, Marco Favaro, Philip N Ross, Junko Yano, Zhi Liu, Zahid Hussain, Ethan J Crumlin
Understanding the surface chemistry of electrocatalysts in operando can bring insight into the reaction mechanism, and ultimately the design of more efficient materials for sustainable energy storage and conversion. Recent progress in synchrotron based X-ray spectroscopies for in operando characterization allows us to probe the solid/liquid interface directly while applying an external potential, applied here to the model system of Pt in alkaline electrolyte for the hydrogen evolution reaction (HER). We employ ambient pressure X-ray photoelectron spectroscopy (AP-XPS) to identify the oxidation and reduction of Pt-oxides and hydroxides on the surface as a function of applied potential, and further assess the potential for hydrogen adsorption and absorption (hydride formation) during and after the HER...
November 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29165999/crystal-growth-with-macromolecular-additives
#9
Alexander G Shtukenberg, Michael D Ward, Bart Kahr
Interactions of macromolecules with growing crystalline surfaces play an important role in biomineralization, determine survival of some organisms at low temperatures, and offer a range of potential industrial applications. The current understanding of crystal growth processes in the presence of macromolecules, including peptides and proteins, is reviewed, with a focus on interactions between macromolecules and surfaces of crystalline materials, macromolecule adsorption on different types of crystal surfaces, crystallization kinetics in the presence of macromolecular additives, macromolecule incorporation, and defect generation...
November 22, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/29165997/materials-for-the-recovery-of-uranium-from-seawater
#10
Carter W Abney, Richard T Mayes, Tomonori Saito, Sheng Dai
More than 1000× uranium exists in the oceans than exists in terrestrial ores. With nuclear power generation expected to increase over the coming decades, access to this unconventional reserve is a matter of energy security. With origins in the mid-1950s, materials have been developed for the selective recovery of seawater uranium for more than six decades, with a renewed interest in particular since 2010. This review comprehensively surveys materials developed from 2000-2016 for recovery of seawater uranium, in particular including recent developments in inorganic materials; polymer adsorbents and related research pertaining to amidoxime; and nanostructured materials such as metal-organic frameworks, porous-organic polymers, and mesoporous carbons...
November 22, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/29165491/fe3o4-aunps-anchored-2d-metal-organic-framework-nanosheets-with-dna-regulated-switchable-peroxidase-like-activity
#11
Bing Tan, Huimin Zhao, Weihao Wu, Xuan Liu, Yaobin Zhang, Xie Quan
Two-dimensional (2D) metal-organic framework (MOF) nanosheets emerging as a new member of the 2D family have received significant research interest in recent years. Herein, we have successfully synthesized 2D copper-based MOF nanosheets with bimetallic anchorage using a facile two-step process at room temperature and ambient pressure, denoted as Cu(HBTC)-1/Fe3O4-AuNPs nanosheets. The as-synthesized 2D bimetallic MOF nanosheets displayed enhanced peroxidase-like activity with relatively high catalytic velocity and affinity for substrates compared with previously reported peroxidase mimics...
November 22, 2017: Nanoscale
https://www.readbyqxmd.com/read/29165474/sugar-and-mineral-enriched-fraction-from-olive-mill-wastewater-for-promising-cosmeceutical-application-characterization-in-vitro-and-in-vivo-studies
#12
Maria Domenica Di Mauro, Barbara Tomasello, Roberta Carla Giardina, Sandro Dattilo, Veronica Mazzei, Fulvia Sinatra, Massimo Caruso, Nicola D'Antona, Marcella Renis
Nowadays, agro-food by-products represent a potential low-cost source of biologically active ingredients which have been paid significant attention as nutraceuticals, medicine, food and cosmetics. In a previous study we evaluated the total sugars, metals and polyphenols of olive mill wastewater (OMWW) from a Cerasuola olive cultivar. In the present work we selectively recovered a sugar and mineral enriched fraction (SMEF) from Cerasuola OMWW by a green adsorption/desorption process. The SMEF was mainly found to be composed of monosaccharides and potassium by HPLC-ELSD and ICP-MS...
November 22, 2017: Food & Function
https://www.readbyqxmd.com/read/29165380/direct-modification-of-microcrystalline-cellulose-with-ethylenediamine-for-use-as-adsorbent-for-removal-amitriptyline-drug-from-environment
#13
Roosevelt D S Bezerra, Régis C Leal, Mateus S da Silva, Alan I S Morais, Thiago H C Marques, Josy A Osajima, Andréia B Meneguin, Hernane da S Barud, Edson C da Silva Filho
Cellulose derivatives have been widely used as adsorbents for the removal of micropollutants such as drugs, dyes, and metals, due to their abundance, low cost and non-contaminating nature. In this context, several studies have been performed searching for new adsorbents (cellulose derivatives) efficient at contaminant removal from aqueous solutions. Thus, a new adsorbent was synthesized by chemical modification of cellulose with ethylenediamine in the absence of solvent and applied to the adsorption of amitriptyline (AMI) in aqueous solution...
November 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29165072/mpeg-pla-micelle-for-delivery-of-effective-parts-of-andrographis-paniculata
#14
Hailu Yao, Shiyong Song, Xiaolu Miao, Xiao Liu, Zhen Wang, Xiaoting Shao, Yu Zhang, Guang Han
Many studies have shown that Andrographis paniculata (Burm. f.) Nees has a good anti-tumor effect, but poor solubility in water and poor bioavailability hinder the modernization of it. To formulate the effective parts (mainly diterpene lactones) of Andrographis paniculata (AEP) into targeting drug delivery system, a series of poly(ethylene glycol)-poly(D.L-lactic acid)(mPEG-PLA) with different ratio of hydrophilic and hydrophobic segment were synthetized to encapsulate AEP. AEP micelles were prepared by a simple solvent-evaporation method...
November 19, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29164874/combined-reflectometric-interference-spectroscopy-and-quartz-crystal-microbalance-detect-differential-adsorption-of-lipid-vesicles-with-different-phase-transition-temperatures-on-sio2-tio2-and-au-surfaces
#15
Taisuke Kojima
Quantitative analysis of biomolecular adsorption on a substrate is crucial for understanding biomolecular interactions. A quartz crystal microbalance (QCM) is a highly sensitive device to detect such interactions based on mass. However, the physicochemical analysis by the QCM alone often leads to overestimation of the actual adsorbed mass. Here a combined reflectometric interference spectroscopy (RIfS) and QCM is developed to simultaneously analyze adsorption of biomolecules. The RIfS detects the adsorbed mass based on the reflectance and predicts the adsorbed condition by modeling the reflection spectra using the transfer matrix method...
November 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29164856/aerosol-crosslinked-crown-ether-diols-melded-with-poly-vinyl-alcohol-as-specialized-microfibrous-li-adsorbents
#16
Lawrence A Limjuco, Grace Masbate Nisola, Rey Eliseo Castillo Torrejos, Jeong Woo Han, Ho Seong Song, Khino J Parohinog, Sangho Koo, Seong-Poong Lee, Wook-Jin Chung
Crown ether (CE)-based Li(+) adsorbent microfibers (MFs) were successfully fabricated through a combined use of CE diols, electrospinning, and aerosol crosslinking. The 14-16 membered CEs, with varied ring sub-units and cavity dimensions, have two hydroxyl groups for covalent attachments to poly(vinyl alcohol) (PVA) as the chosen matrix. The CE diols were blended with PVA and transformed into microfibers via electrospinning, a highly effective technique in minimizing CE loss during MF fabrication. Subsequent aerosol glutaraldehyde (GA) crosslinking of the electrospun CE/PVA MFs stabilized the adsorbents in water...
November 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29164854/nitrogen-doped-porous-carbon-zno-nanopolyhedra-derived-from-zif-8-new-materials-for-photoelectrochemical-biosensors
#17
Ruiying Yang, Xiaoxia Yan, Yanmei Li, Xiaohua Zhang, Jinhua Chen
Herein, novel photoactive materials, nitrogen-doped porous carbon-ZnO (NPC-ZnO) nanopolyhedra, were prepared by direct carbonization of ZIF-8 nanopolyhedra in a nitrogen atmosphere. The morphology, structure and photoelectrochemical (PEC) properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, nitrogen adsorption-desorption method, and PEC methods. The results showed that the obtained NPC-ZnO nanopolyhedra had rhombic dodecahedron morphology with uniform particle size of about 100 nm and high surface area of 609...
November 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29164779/characterization-of-the-interaction-forces-in-a-drug-carrier-complex-of-doxorubicin-with-a-drug-binding-peptide
#18
Gergana Gocheva, Nina Ilieva, Kalina Peneva, Anela Ivanova
Polypeptide-based materials are used as building blocks for drug delivery systems aimed at toxicity decrease of chemotherapeutics. A molecular-level approach is adopted for investigating the non-covalent interactions between doxorubicin and a recently synthesized drug-binging peptide as a key part of a system for delivery to neoplastic cells. MD simulations in aqueous solution at room and body temperature are applied to investigate the structure and the binding modes within the drug-peptide complex. The tryptophans are outlined as the main chemotherapeutic adsorption sites and the importance of their placement in the peptide sequence is highlighted...
November 22, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/29164537/simple-technology-for-recycling-phosphate-from-wastewater-to-farmland-in-rural-areas
#19
Hisao Ohtake, Kenji Okano, Masashi Kunisada, Hiroyuki Takano, Masaya Toda
A simple technology for phosphate (P i ) recovery has been developed using a bifunctional adsorption-aggregation agent. The bifunctional agent was prepared by soaking calcium silicates in hydrochloric acid solution. Importantly, recyclable calcium silicates were available almost free of charge from the cement industry and also from the steel industry. The acid treatment was essential not only for enhancing the ability of calcium silicates to remove P i from aqueous solution but also for enabling the high settleability of removed P i ...
November 21, 2017: Ambio
https://www.readbyqxmd.com/read/29164458/phosphorus-speciation-and-release-kinetics-of-swine-manure-biochar-under-various-pyrolysis-temperatures
#20
Xinqiang Liang, Yi Jin, Miaomiao He, Christophe Niyungeko, Jin Zhang, Chunlong Liu, Guangming Tian, Yuji Arai
Converting swine manure to biochar is an effective way to recycle valuable nutrients, but there are few reports on its feasibility as a phosphorus (P) source. The objective of this study was to clarify the unique nature, including P speciation, of manure biochar products under various pyrolysis temperatures. We used solution (31)P nuclear magnetic resonance and P K-edge X-ray adsorption near-edge spectroscopy (P XANES) to characterize P species in swine manure biochar. For every 100 °C increment starting from 300 °C, the P content in manure biochar increased by 2...
November 21, 2017: Environmental Science and Pollution Research International
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