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Articles de revues sur le sujet « One-surface chemistry »

Auteur : Grafiati
Publié le 9 novembre 2024

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1

Liu, Zhangshuan, Liming Fang, Guillaume Delaittre, Yu Ke et Gang Wu. « Heparinized Polyurethane Surface Via a One-Step Photografting Method ». Molecules 24, no 4 (20 février 2019) : 758. http://dx.doi.org/10.3390/molecules24040758.

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Traditional methods using coupling chemistry for surface grafting of heparin onto polyurethane (PU) are disadvantageous due to their generally low efficiency. In order to overcome this problem, a quick one-step photografting method is proposed here. Three heparin derivatives incorporating 0.21, 0.58, and 0.88 wt% pendant aryl azide groups were immobilized onto PU surfaces, leading to similar grafting densities of 1.07, 1.17, and 1.13 μg/cm2, respectively, yet with increasing densities of anchoring points. The most negatively charged surface and the maximum binding ability towards antithrombin III were found for the heparinized PU with the lowest amount of aryl azide/anchor sites. Furthermore, decreasing the density of anchoring points was found to inhibit platelet adhesion to a larger extent and to prolong plasma recalcification time, prothrombin time, thrombin time, and activated partial thromboplastin time to a larger extent. This was also found to enhance the bioactivity of immobilized heparin from 22.9% for raw heparin to 36.9%. This could be explained by the enhanced molecular mobility of immobilized heparin when it is more loosely anchored to the PU surface, as well as a higher surface charge.
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Brandhuber, Doris, Nicola Huesing, Christina K. Raab, Viktoria Torma et Herwig Peterlik. « Cellular mesoscopically organized silica monoliths with tailored surface chemistry by one-step drying/extraction/surface modification processes ». Journal of Materials Chemistry 15, no 18 (2005) : 1801. http://dx.doi.org/10.1039/b417675h.

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Mirkin, Chad A. « Dip-Pen Nanolithography : Automated Fabrication of Custom Multicomponent Sub-100-Nanometer Surface Architectures ». MRS Bulletin 26, no 7 (juillet 2001) : 535–38. http://dx.doi.org/10.1557/mrs2001.126.

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As physical processes for generating miniaturized structures increase in resolution, the types of scientific questions one can ask and answer become increasingly refined. Indeed, if one had the capability to control surface architecture on the 1–100-nm length scale with reasonable speed and accuracy, one could ask and answer some of the most important questions in science and, in the process, develop technologies that could allow for major advances in surface science, chemistry, biology, and human health. This length scale, which is exceedingly difficult to control, comprises the length scale of much of chemistry and most of biology. Indeed, chemical and biochemical recognition events are essentially sophisticated examples of pattern-recognition processes. Therefore, if one could pattern on this length scale with control over feature size, shape, registration, and composition, one could systematically uncover the secrets of recognition processes involving extraordinarily complex molecules. Arecent invention, dip-pen nanolithography (DPN), may provide access to this type of control over surface architecture and entry into a new realm of structure-versus-function studies for chemists, biologists, physicists, and materials scientists.
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Wang, Zixiao, Feichen Cui, Yang Sui et Jiajun Yan. « Radical chemistry in polymer science : an overview and recent advances ». Beilstein Journal of Organic Chemistry 19 (18 octobre 2023) : 1580–603. http://dx.doi.org/10.3762/bjoc.19.116.

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Radical chemistry is one of the most important methods used in modern polymer science and industry. Over the past century, new knowledge on radical chemistry has both promoted and been generated from the emergence of polymer synthesis and modification techniques. In this review, we discuss radical chemistry in polymer science from four interconnected aspects. We begin with radical polymerization, the most employed technique for industrial production of polymeric materials, and other polymer synthesis involving a radical process. Post-polymerization modification, including polymer crosslinking and polymer surface modification, is the key process that introduces functionality and practicality to polymeric materials. Radical depolymerization, an efficient approach to destroy polymers, finds applications in two distinct fields, semiconductor industry and environmental protection. Polymer chemistry has largely diverged from organic chemistry with the fine division of modern science but polymer chemists constantly acquire new inspirations from organic chemists. Dialogues on radical chemistry between the two communities will deepen the understanding of the two fields and benefit the humanity.
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Morsbach, Eva, Markus Nesselberger, Jonas Warneke, Philipp Harz, Matthias Arenz, Marcus Bäumer et Sebastian Kunz. « 1-Naphthylamine functionalized Pt nanoparticles : electrochemical activity and redox chemistry occurring on one surface ». New Journal of Chemistry 39, no 4 (2015) : 2557–64. http://dx.doi.org/10.1039/c4nj02040e.

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Li, Siqi, Songwei Zhang, Dejun Dai et Tao Li. « Facile One-Step Metal–Organic Framework Surface Polymerization Method ». Inorganic Chemistry 60, no 16 (18 juin 2021) : 11750–55. http://dx.doi.org/10.1021/acs.inorgchem.1c00949.

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Shen, Jie, Rui Chen, Jinghong Wang, Ziqing Zhao, Rong Gu, John L. Brash et Hong Chen. « One-step surface modification strategy with composition-tunable microgels : From bactericidal surface to cell-friendly surface ». Colloids and Surfaces B : Biointerfaces 212 (avril 2022) : 112372. http://dx.doi.org/10.1016/j.colsurfb.2022.112372.

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Li, Shang, Mi Gu, Sara Garzandat, Xiao Wei Sun et Renaud Bachelot. « 8‐2 : The micro‐scale adsorption of QDs on select surface by click chemistry ». SID Symposium Digest of Technical Papers 55, S1 (avril 2024) : 80–82. http://dx.doi.org/10.1002/sdtp.17001.

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QDs’ adsorption on multi‐surface is one of the key points to achieve on‐chip nano‐source. By click chemistry between surface functionalization layer and QDs, QDs were adsorbed on the target surface. This method could achieve small size, stable performance and high efficiency at the same time. Two kinds of surface functionalization material, with similar structure, were used to compare the QDs adsorption ability. DCOOH, the material with click chemistry possibility, exhibit 3‐time stronger adsorption ability comparing the DNO2.
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Machová, Dita, Anna Oberle, Lucie Zárybnická, Jakub Dohnal, Vít Šeda, Jakub Dömény, Veronika Vacenovská et al. « Surface Characteristics of One-Sided Charred Beech Wood ». Polymers 13, no 10 (12 mai 2021) : 1551. http://dx.doi.org/10.3390/polym13101551.

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The aim of this paper was to analyze selected properties of beech wood (Fagus sylvatica L.) treated by one-sided surface charring. Specimens were one-side charred with a hot plate using several time-temperature combinations (from 200 to 400 °C). Characteristics such as colour, discoloration, surface roughness, fire resistance, total carbohydrate content at several wood layers and decay resistance were evaluated. Surface charring was applied to the radial and tangential surfaces. Colour measurements showed that the surface of the wood turned grey due to charring. In addition to colour measurements, other experiments showed significant differences between radial and tangential specimens due to their different structures. The higher the temperature used in treating them, the lower the roughness values for radial specimens, while the trend for tangential specimens was the opposite. A smoother surface is more fire resistant, so radial specimens are generally better in this regard. Tangential specimens are more susceptible during preparation to forming cracks that impair flame resistance because a continuous protective densified layer is not formed. The determination of total carbohydrates revealed significant changes at various wood depths after surface charring. These changes were more predictable in radial specimens due to the annual ring orientation, because each layer consisted of a similar earlywood/latewood ratio. Finally, when decay resistance was assessed, weight loss was found to be lower in all specimens than in the references. The results suggest that charring at a particular combination of temperature and time improved the investigated properties of the surface-modified beech.
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Pytskii, Ivan S., Irina V. Minenkova, Elena S. Kuznetsova, Rinad Kh Zalavutdinov, Aleksei V. Uleanov et Aleksei K. Buryak. « Surface chemistry of structural materials subjected to corrosion ». Pure and Applied Chemistry 92, no 8 (25 septembre 2020) : 1227–37. http://dx.doi.org/10.1515/pac-2019-1219.

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AbstractThe article describes a comprehensive mass spectrometric approach to the study of surfaces of structural materials. The combined use of thermal desorption mass spectrometry, gas and liquid chromatography, and laser desorption/ionization mass spectrometry (LDI) to provide information about the surface and surface layers of materials is proposed. The suggested method allows one to determine the thermodynamic characteristics of compounds and surface contaminants adsorbed on surfaces, as well as surface layers, to determine the composition of volatile and non-volatile contaminants on the surface, and to determine the nature of the distribution over the surface of these compounds. The method allows to obtain the most complete information about the surface condition and can be used to predict the life of structural materials.
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Gao, Min, Pengli An, Honghong Rao, Zhengrong Niu, Xin Xue, Mingyue Luo, Xiuhui Liu, Zhonghua Xue et Xiaoquan Lu. « Molecule-gated surface chemistry of Pt nanoparticles for constructing activity-controllable nanozymes and a three-in-one sensor ». Analyst 145, no 4 (2020) : 1279–87. http://dx.doi.org/10.1039/c9an01956a.

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A new surface chemistry-based modulation for constructing activity-controllable Pt nanoparticle nanozymes and their application in the development of a triple signal readout-based three-in-one sensor for Cu2+ determination.
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Qing, Weihua, Jianqiang Wang, Xiaohua Ma, Zhikan Yao, Yong Feng, Xiaonan Shi, Fu Liu, Peng Wang et Chuyang Y. Tang. « One-step tailoring surface roughness and surface chemistry to prepare superhydrophobic polyvinylidene fluoride (PVDF) membranes for enhanced membrane distillation performances ». Journal of Colloid and Interface Science 553 (octobre 2019) : 99–107. http://dx.doi.org/10.1016/j.jcis.2019.06.011.

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Jacobse, Peter, Marc-Etienne Moret, Robertus Klein Gebbink et Ingmar Swart. « Tracking On-Surface Chemistry with Atomic Precision ». Synlett 28, no 19 (17 août 2017) : 2509–16. http://dx.doi.org/10.1055/s-0036-1590867.

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The field of on-surface synthesis has seen a tremendous development in the past decade as an exciting new methodology towards atomically well-defined nanostructures. A strong driving force in this respect is its inherent compatibility with scanning probe techniques, which allows one to ‘view’ the reactants and products at the single-molecule level. In this article, we review the ability of noncontact atomic force microscopy to study on-surface chemical reactions with atomic precision. We highlight recent advances in using noncontact atomic force microscopy to obtain mechanistic insight into reactions and focus on the recently elaborated mechanisms in the formation of different types of graphene nanoribbons.
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Araújo, Mariana P., O. S. G. P. Soares, A. J. S. Fernandes, M. F. R. Pereira et C. Freire. « Tuning the surface chemistry of graphene flakes : new strategies for selective oxidation ». RSC Advances 7, no 23 (2017) : 14290–301. http://dx.doi.org/10.1039/c6ra28868e.

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15

Bertel, E., et U. Bischler. « One-dimensional surface states on metal surfaces ». Surface Science 307-309 (avril 1994) : 947–52. http://dx.doi.org/10.1016/0039-6028(94)91521-0.

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Rafik, Abdellatif, Hafid Zouihri et Taoufiq Guedira. « One-Dimensional Hydrogen-Bonded N–H…O in the Hybrid Phosphate : Hirshfeld Surface Analysis and DFT Quantum Chemical Calculations ». Chemistry & ; Chemical Technology 15, no 3 (15 août 2021) : 359–68. http://dx.doi.org/10.23939/chcht15.03.359.

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In the present work the 3D-supramolecular network is stabilized by N–H…O and O–H…O hydrogen bonds, by O…N interactions involving the organic cation and inorganic anion as checked by Hirshfeld surface analysis. The van der Waals contacts play a key role in the consolidation of the packing of 4-chloro-2-methylanilinium dihydrogenphosphate[4-CMDHP] structure. In order to support experimental results, density functional theory calculations have been performed using B3LYP functional with 3-21 G basis set. All of the obtained theoretical results are in a perfect agreement with the experimental ones. Furthermore, nonlinear optical behavior of 4-CMDHP has been investigated by determining the Hirshfeld surface, density of states and HOMO-LUMO energy gap using the same basis set. Finally, the molecular electrostatic potential surface of 4-CMDHP molecule was simulated and discussed.
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Sedlák, Miloš, et Klaus Tauer. « One-Step Synthesis of New Anionic Gemini Surface Active Azoinitiators ». Synlett, no 2 (2004) : 0299–300. http://dx.doi.org/10.1055/s-2003-45006.

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Yong, Wei Ying Doreen, Zhihua Zhang, Galder Cristobal et Wee Shong Chin. « One-pot synthesis of surface functionalized spherical silica particles ». Colloids and Surfaces A : Physicochemical and Engineering Aspects 460 (octobre 2014) : 151–57. http://dx.doi.org/10.1016/j.colsurfa.2014.03.039.

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19

Casey, W. H., C. Eggleston, P. A. Johnsson, H. R. Westrich et M. F. Hochella. « Aqueous Surface Chemistry and Corrosion of Minerals ». MRS Bulletin 17, no 5 (mai 1992) : 23–29. http://dx.doi.org/10.1557/s0883769400041245.

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Nature is generous with complexity. The number of thermodynamic variables necessary to describe even simple stream chemistry can easily number to a hundred. Nevertheless, research on Earth materials remains exciting because of the vastness of geologic time and the huge scale of global processes. For example, even simple ion-exchange experiments have profound implications when considered in the context of global cycling of elements. Sodium exchange from seawater onto the 1.83 × 1016 g of river-borne clays removes 20–30% of the yearly sodium addition to the ocean. Research on Earth materials, although complex, is rewarding through the scale of the potential result.The surface chemistry of minerals is important for understanding natural mineral transformations and also because surface reactions help control the migration and degradation rates of pollutants in natural waters. These pollutants range from organic herbicides and pesticides, which leak past reactive soil horizons into groundwaters, to acid rain and heavy-metal leaching from mine tailings, sewage sludge, or coal fly ash. The importance of characterizing mineral surface chemistry is clear when one considers that 0.5 to 2% of usable groundwater in the United States is thought to be contaminated.This article reviews some simple surface chemistry of oxide and silicate minerals in water. We focus on the kinetics of mineral corrosion because this subject is interesting to both geochemists and materials scientists. The surface properties that make some solid oxides relatively inert to acid corrosion, for example, are also manifested in the rates of natural mineral weathering.
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Kusuktham, Boonsri, et Kawee Srikulkit. « One-pot synthesis of polymeric bead bearing surface charge ». Journal of Applied Polymer Science 92, no 3 (2004) : 1375–87. http://dx.doi.org/10.1002/app.13616.

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Esmaeili, Akbar, Shirin Sharafian, Shila Safaiyan, Shamsali Rezazadeh et Abdolhossein Rustaivan. « Biotransformation of one monoterpene by sporulated surface cultures ofAspergillus nigerandPenicilliumsp. » Natural Product Research 23, no 11 (20 juillet 2009) : 1058–61. http://dx.doi.org/10.1080/14786410802547341.

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Allard, L. F., P. Pendleton et J. S. Brinen. « Structure and chemistry of silicon carbide whisker surfaces ». Proceedings, annual meeting, Electron Microscopy Society of America 44 (août 1986) : 472–73. http://dx.doi.org/10.1017/s0424820100143912.

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Silicon carbide whiskers are of interest as dispersed phase strengthened in metals, ceramics, and polymer composites. Characterization of whisker structure, including surface morphology, crystallography and chemistry, is important so that whisker models can be devised on which calculations of surface energetics controlling wetting/bonding phenomena can be accurately based. In current work, the microstructures of several commercially-available SiC whisker types have been characterized by high resolution TEM and surface analysis techniques. Results of the characterization of one manufacturer's whiskers, Tateho Chemical Industries, are described in this paper.
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Sánchez‐Grande, Ana, José I. Urgel, Aleš Cahlík, José Santos, Shayan Edalatmanesh, Eider Rodríguez‐Sánchez, Koen Lauwaet et al. « Diradical Organic One‐Dimensional Polymers Synthesized on a Metallic Surface ». Angewandte Chemie International Edition 59, no 40 (11 août 2020) : 17594–99. http://dx.doi.org/10.1002/anie.202006276.

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Sun, Qiang, Chi Zhang, Zhiwen Li, Huihui Kong, Qinggang Tan, Aiguo Hu et Wei Xu. « On-Surface Formation of One-Dimensional Polyphenylene through Bergman Cyclization ». Journal of the American Chemical Society 135, no 23 (28 mai 2013) : 8448–51. http://dx.doi.org/10.1021/ja404039t.

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Ervin, J. S., S. Zabarnick et T. F. Williams. « One-Dimensional Simulations of Jet Fuel Thermal-Oxidative Degradation and Deposit Formation Within Cylindrical Passages ». Journal of Energy Resources Technology 122, no 4 (19 septembre 2000) : 229–38. http://dx.doi.org/10.1115/1.1326915.

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Flowing aviation fuel is used as a coolant in military aircraft. Dissolved O2 reacts with the heated fuel to form undesirable surface deposits which disrupt the normal flow. For purposes of aircraft design, it is important to understand and predict jet fuel oxidation and the resulting surface deposition. Detailed multi-dimensional numerical simulations are useful in understanding interactions between the fluid dynamics and fuel chemistry. Unfortunately, the detailed simulation of an entire fuel system is impractical. One-dimensional and lumped parameter models of fluid dynamics and chemistry can provide the simultaneous simulation of all components which comprise a complex fuel system. In this work, a simplified one-dimensional model of jet fuel oxidation and surface deposition within cylindrical passages is developed. Both global and pseudo-detailed chemical kinetic mechanisms are used to model fuel oxidation, while a global chemistry model alone is used to model surface deposition. Dissolved O2 concentration profiles and surface deposition rates are calculated for nearly isothermal and nonisothermal flow conditions. Flowing experiments are performed using straight-run jet fuels, and the predicted dissolved O2 concentrations and surface deposition rates agree reasonably well with measurements over a wide range of temperature and flow conditions. The new model is computationally inexpensive and represents a practical alternative to detailed multi-dimensional calculations of the flow in cylindrical passages. [S0195-0738(00)01204-8]
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Cao, Jiliang, Chunli Meng, Xianwei Cheng et Xingyuan Pan. « Surface alkali deweighting and dyeing of polyester fabric by one-bath and one-step process ». Surface Innovations 7, no 2 (mai 2019) : 104–11. http://dx.doi.org/10.1680/jsuin.18.00049.

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Barille, Régis, Jean-Michel Nunzi, Sohrab Ahmadi-Kandjani, Ewelina Ortyl et Stanislaw Kucharski. « One step inscription of surface relief microgratings ». Optics Communications 280, no 1 (décembre 2007) : 217–20. http://dx.doi.org/10.1016/j.optcom.2007.07.047.

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Ma, Yuanyuan, Yongquan Qu et Wei Zhou. « Surface engineering of one-dimensional tin oxide nanostructures for chemical sensors ». Microchimica Acta 180, no 13-14 (23 juillet 2013) : 1181–200. http://dx.doi.org/10.1007/s00604-013-1048-x.

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Cheng, Xiaoyu, Richard Gondosiswanto, Simone Ciampi, Peter J. Reece et J. Justin Gooding. « One-pot synthesis of colloidal silicon quantum dots and surface functionalization via thiol–ene click chemistry ». Chemical Communications 48, no 97 (2012) : 11874. http://dx.doi.org/10.1039/c2cc35954e.

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Bera, Madhab, Chandravati, Pragya Gupta et Pradip K. Maji. « Facile One-Pot Synthesis of Graphene Oxide by Sonication Assisted Mechanochemical Approach and Its Surface Chemistry ». Journal of Nanoscience and Nanotechnology 18, no 2 (1 février 2018) : 902–12. http://dx.doi.org/10.1166/jnn.2018.14306.

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Rakova, E. V. « One-dimensional ordering on the (012) LiNbO3 surface ». Surface Science 307-309 (avril 1994) : 1172–76. http://dx.doi.org/10.1016/0039-6028(94)91559-8.

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Li, Wang. « The Study on Surface Chemistry of Nanoporous Black Si Layers ». Applied Mechanics and Materials 79 (juillet 2011) : 304–8. http://dx.doi.org/10.4028/www.scientific.net/amm.79.304.

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We reported our detailed investigation of the microstructure and surface chemistry of nanoporous black Si layers using transmission electron microscopy techniques such as HRTEM, EDS, and EELS. We found that a one-step nanoparticle-catalyzed liquid etch creates deep conical nanovoids. The cones provide the density-graded surface that suppresses reflection. The surface of the as-etched nanoporous black Si is an amorphous Si suboxide (SiOx) produced by the strongly oxidizing nanocatalyzed etch. The c-Si/suboxide interface is rough at the nanometer scale and contains a high density of point defects.
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Kim, Bong-Hwan, Sang Mok Lee, Je Sik Shin et B. M. Moon. « Tribological Behavior and Surface Chemistry Characteristics of Quasicrystal Coatings ». Solid State Phenomena 124-126 (juin 2007) : 1541–44. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1541.

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The aim of this study was to investigate the effects of air plasma spraying process parameters on the tribological behavior and surface characteristics of quasicrystal coatings. For this purpose, the response surface method (RSM), one of the designs of experiment (DOE) was utilized to systematically investigate the combined effects of each process parameters. The RSM analysis revealed that the superior tribological performance of quasicrystal coatings was obtained by the optimized condition of specific micro-hardness and porosity level. It was specially quoted that the relatively low hardness of quasicrystal coatings caused the improvement of abrasive wear resistance during the current investigation.
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Olchowski, Rafał, Emil Zięba, Dimitrios A. Giannakoudakis, Ioannis Anastopoulos, Ryszard Dobrowolski et Mariusz Barczak. « Tailoring Surface Chemistry of Sugar-Derived Ordered Mesoporous Carbons towards Efficient Removal of Diclofenac from Aquatic Environments ». Materials 13, no 7 (1 avril 2020) : 1625. http://dx.doi.org/10.3390/ma13071625.

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Ordered mesoporous carbon (CMK-3), obtained from an abundant natural source, sugar, was thermochemically modified with dicyandiamide and thiourea as well as by classical oxidization with hydrogen peroxide to introduce specific surface groups. Thermochemical modifications resulted in carbon with almost unchanged porosity and altered surface chemistry while porosity of H2O2-treated carbon was seriously deteriorated. The obtained carbons were tested as sorbents of diclofenac, considered as one of the emerging water contaminants. Changes in porosity and surface chemistry of modified carbons resulted in significant differences with regard to the uptake of diclofenac. Dicyandiamide-modified carbon showed highest uptake of drugs, reaching 241 mg g−1 that is attributed to its developed microporosity as well as surface chemistry composed of basic groups facilitating electrostatic interactions with diclofenac anions. Desorption study showed that diclofenac is strongly bonded, albeit with a different degree depending on the modification of the CMK-carbon. The obtained results were compared with up-to-date literature regarding sorption of diclofenac by carbon-based sorbents.
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Pulliainen, Unni, Nick Bos, Patrizia d’Ettorre et Liselotte Sundström. « The Scent of Ant Brood : Caste Differences in Surface Hydrocarbons of Formica exsecta Pupae ». Journal of Chemical Ecology 47, no 6 (26 avril 2021) : 513–24. http://dx.doi.org/10.1007/s10886-021-01275-w.

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AbstractChemical communication is common across all organisms. Insects in particular use predominantly chemical stimuli in assessing their environment and recognizing their social counterparts. One of the chemical stimuli used for recognition in social insects, such as ants, is the suite of long-chain, cuticular hydrocarbons. In addition to providing waterproofing, these surface hydrocarbons serve as a signature mixture, which ants can perceive, and use to distinguish between strangers and colony mates, and to determine caste, sex, and reproductive status of another individual. They can be both environmentally and endogenously acquired. The surface chemistry of adult workers has been studied extensively in ants, yet the pupal stage has rarely been considered. Here we characterized the surface chemistry of pupae of Formica exsecta, and examine differences among sexes, castes (reproductive vs. worker), and types of sample (developing individual vs. cocoon envelope). We found quantitative and qualitative differences among both castes and types of sample, but male and female reproductives did not differ in their surface chemistry. We also found that the pupal surface chemistry was more complex than that of adult workers in this species. These results improve our understanding of the information on which ants base recognition, and highlights the diversity of surface chemistry in social insects across developmental stages.
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Jensen, Flemming, Jon Wulff Petersen, Sergey Y. Shiryaev et Arne Nylandsted Larsen. « Zero- and one-dimensional nanostructures on an surface ». Nanotechnology 7, no 2 (1 juin 1996) : 117–21. http://dx.doi.org/10.1088/0957-4484/7/2/004.

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Wachsman, Eric, Ian Robinson, Yilin Huang, Samuel Aaron Horlick, A. Mohammed Hussain et Alireza Pesaran. « Enhancing Low-Temperature SOFC Performance and Durability via Surface Modification ». ECS Transactions 111, no 6 (19 mai 2023) : 47–50. http://dx.doi.org/10.1149/11106.0047ecst.

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The development of active cathodes is one of the most critical challenges to lowering the operating temperature for SOFCs. By modifying the cathode surface chemistry the activity and durability can be simultaneously enhanced on high-performing, low-temperature cathodes. This low-temperature modification using multi-valent cations activates the highly defected surface and maintains the nanoscale electrocatalysts by bypassing the high-temperature sintering procedure for SOFC fabrication. The modified cathode at 600 °C shows an order of magnitude reduction in impedance to only 0.05 Ωcm2 with a peak power density of 1.1 W/cm2 and increases stability over 2000 hours. The combination of in situcharacterization, distribution of relaxation time analysis on impedance spectroscopy, and surface chemistry analysis reveals the importance of surface chemistry control on the gas-solid reaction activity and durability and provides the design principle for future solid oxide cells.
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38

Dilena, Gabriele, Simone Pistillo et Enrico Bodo. « About the Formation of NH2OH+ from Gas Phase Reactions under Astrochemical Conditions ». Molecules 28, no 7 (24 mars 2023) : 2932. http://dx.doi.org/10.3390/molecules28072932.

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We present here an analysis of several possible reactive pathways toward the formation of hydroxylamine under astrochemical conditions. The analysis is based on ab initio quantum chemistry calculations. Twenty-one bimolecular ion–molecule reactions have been studied and their thermodynamics presented. Only one of these reactions is a viable direct route to hydroxylamine. We conclude that the contribution of gas-phase chemistry to hydroxylamine formation is probably negligible when compared to its formation via surface grain chemistry. However, we have found several plausible gas-phase reactions whose outcome is the hydroxylamine cation.
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39

Podrázský, V. V. « Effect of controlled liming on the soil chemistry on the immission clear-cut ». Journal of Forest Science 52, Special Issue (1 janvier 2006) : S28—S34. http://dx.doi.org/10.17221/10157-jfs.

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Results obtained during 14 years of the experiment are presented. Extreme site conditions are determined by: 8<sup>th</sup> vegetation altitudinal zone, podzolic soil and hard climate – average annual temperature 4°C, average annual precipitation around 1,200 mm. Effects of surface experimental liming were studied on immission clear-cuts in long time period, study area is located on the Velká Deštná locality on the main Orlické hory Mts. range. Research plots were established and the basic survey was done in spring of 1988, studies of liming effects were performed in the period 1987–2002. On particular plots, 0, 1,308, 2,826, 3,924 and 8,478 kg/ha of fine limestone (grain size under 1 mm) was distributed by hands on the soil surface, as an application of 3 and 9 t/ha of “fine” and “coarse” material (together 5 variants including the control one). Results are available for the forestry practice, research has to continue in the future – potential of negative liming impacts is topical here, consisting in humus mineralization and nutrients losses. Maximum effects on the soil reaction were observed in 8–10 years after limestone application at the soil surface (F – horizon) and in the period 10–15 years lower (H, A – horizons). Base saturation dynamics shows the time delay 2–4 years following pH values. For the site protection, efficient forest stands are vitally important of pioneer as well as climax species.
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Sharma, Pratigya, Manickam Minakshi Sundaram, Teeraphat Watcharatharapong, Damian Laird, Holger Euchner et Rajeev Ahuja. « Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO4 Nanorods with Improved Redox Chemistry ». ACS Applied Materials & ; Interfaces 12, no 40 (15 septembre 2020) : 44815–29. http://dx.doi.org/10.1021/acsami.0c13755.

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41

Gu, Shaojin, Huan Xia, Jiehao Du, Ling Yang, Yajun Cai, Yingshan Zhou et Jingjing Huang. « Surface modification of polysulfones via one-pot ATRP and click chemistry : Zwitterionic graft complex and their hemocompatibility ». Fibers and Polymers 17, no 2 (février 2016) : 161–65. http://dx.doi.org/10.1007/s12221-016-5550-8.

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42

Romeo, Hernán E., Fernando Trabadelo, Matías Jobbágy et Rodrigo Parra. « 2D-ice templated titanium oxide films as advanced conducting platforms for electrical stimulation ». J. Mater. Chem. C 2, no 15 (2014) : 2806–14. http://dx.doi.org/10.1039/c3tc32370f.

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Controlling film surface properties (topography and chemistry) while executing electrical stimulation is one of the most addressed research topics in materials chemistry. In this work, titanium oxide conducting films were 2D-structured by directional freezing and tested as advanced platforms for electrical stimulation.
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43

Kim, Sungwan, Kevin L. Shuford, Hye-Mi Bok, Seong Kyu Kim et Sungho Park. « Intraparticle Surface Plasmon Coupling in Quasi-One-Dimensional Nanostructures ». Nano Letters 8, no 3 (mars 2008) : 800–804. http://dx.doi.org/10.1021/nl0726353.

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44

Lau, Kenny J. X., Elena S. Gusareva, Irvan Luhung, Balakrishnan N. V. Premkrishnan, Anthony Wong, Tuang Yeow Poh, Akira Uchida et al. « Structure vs. chemistry : Alternate mechanisms for controlling leaf microbiomes ». PLOS ONE 18, no 3 (21 mars 2023) : e0275734. http://dx.doi.org/10.1371/journal.pone.0275734.

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The analysis of phyllosphere microbiomes traditionally relied on DNA extracted from whole leaves. To investigate the microbial communities on the adaxial (upper) and abaxial (lower) leaf surfaces, swabs were collected from both surfaces of two garden plants, Rhapis excelsa and Cordyline fruticosa. Samples were collected at noon and midnight and at five different locations to investigate if the phyllosphere microbial communities change with time and location. The abaxial surface of Rhapis excelsa and Cordyline fruticosa had fewer bacteria in contrast to its adaxial counterpart. This observation was consistent between noon and midnight and across five different locations. Our co-occurrence network analysis further showed that bacteria were found almost exclusively on the adaxial surface while only a small group of leaf blotch fungi thrived on the abaxial surface. There are higher densities of stomata on the abaxial surface and these openings are vulnerable ports of entry into the plant host. While one might argue about the settling of dust particles and microorganisms on the adaxial surface, we detected differences in reactive chemical activities and microstructures between the adaxial and abaxial surfaces. Our results further suggest that both plant species deploy different defence strategies to deter invading pathogens on the abaxial surface. We hypothesize that chemical and mechanical defence strategies evolved independently for harnessing and controlling phyllosphere microbiomes. Our findings have also advanced our understanding that the abaxial leaf surface is distinct from the adaxial surface and that the reduced microbial diversity is likely a consequence of plant-microbe interactions.
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45

Wachsman, Eric, Ian Robinson, Yilin Huang, Samuel Aaron Horlick, A. Mohammed Hussain et Alireza Pesaran. « Enhancing Low-Temperature SOFC Performance and Durability via Surface Modification ». ECS Meeting Abstracts MA2023-01, no 54 (28 août 2023) : 8. http://dx.doi.org/10.1149/ma2023-01548mtgabs.

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The development of active cathodes is one of the most critical challenges to lowering the operating temperature for solid oxide fuel cells (SOFCs). Here we demonstrated that by modifying the cathode surface chemistry at a relatively low temperature, the cathode activity and durability can be simultaneously enhanced. This low-temperature modification using multi-valent cations activates the highly defected surface and maintains the nanoscale electrocatalysts by bypassing the high-temperature sintering procedure for SOFC fabrication. The modified cathode at 600 °C shows an order of magnitude reduction in impedance to only 0.05 Ωcm2 with a peak power density of 1.1 W/cm2 and is stable over 2000 hours. The combination of in situ characterization, distribution of relaxation time analysis on impedance spectroscopy, and surface chemistry analysis reveals the importance of surface chemistry control on the gas-solid reaction activity and durability and provides the design principle for numerous future solid oxide cells.
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46

Torres, Tomas, Giovanni Bottari, Jorge Labella et Maxence Urbani. « Fused Porphyrin-Graphene Nanoribbons, One-Dimensional Porphyrinoid Polymers, and Subphthalocyanine-Based 2D-Polymers : On-Surface Synthetic Approaches ». ECS Meeting Abstracts MA2024-01, no 14 (9 août 2024) : 1133. http://dx.doi.org/10.1149/ma2024-01141133mtgabs.

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On-surface synthesis offers a versatile approach to fabricate novel carbon-based nanostructures that cannot be obtained via conventional solution chemistry. Within the family of such nanomaterials, graphene nanoribbons (GNRs) hold a privileged position due to their high potential for different applications. One of the key issues for their application in molecular electronics lies in the fine-tuning of their electronic properties through structural modifications, such as heteroatom doping or the incorporation of non-benzenoid rings. In this context, the covalent fusion of GNRs and porphyrins (Pors) represents a highly appealing strategy.
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Bulnes, F., A. J. Ramirez-Pastor et G. Zgrablich. « Surface diffusion of k-mers in one-dimensional systems ». Surface Science 601, no 2 (janvier 2007) : 569–77. http://dx.doi.org/10.1016/j.susc.2006.10.020.

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48

Razaznejad, B., C. Ruberto, P. Hyldgaard et B. I. Lundqvist. « Hard-materials-surface prediction of one-dimensional electron gas ». Surface Science 532-535 (juin 2003) : 594–99. http://dx.doi.org/10.1016/s0039-6028(03)00172-9.

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Lastusaari, Mika, Eero Laakkonen et Mari Murtonen. « ChemApproach : validation of a questionnaire to assess the learning approaches of chemistry students ». Chemistry Education Research and Practice 17, no 4 (2016) : 723–30. http://dx.doi.org/10.1039/c5rp00216h.

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The theory of learning approaches has proven to be one of the most powerful theories explaining university students' learning. However, learning approaches are sensitive to the situation and the content of learning. Chemistry has its own specific features that should be considered when exploring chemistry students' learning habits, specifically the role of practicals (i.e. hands-on laboratory work), as they are crucial in chemistry education. Therefore, the aims of this study were to find and validate a questionnaire for measuring chemistry students' learning approaches. A 17-item questionnaire was tested with 561 Finnish chemistry students from four different universities. Students ranging from the first year bachelor level to the fifth year master level participated in the study. Statistical analyses showed that a four factor model fitted the data best and these factors were named submissive surface, technical surface, active deep, and practical deep. In order to establish validity, the model was further tested by analysis of the subgroups of the major subject and gender. The analyses show that the questionnaire is statistically valid and can be used for studying chemistry students' learning approaches.
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Hatanaka, Yasumaru, Takenori Tomohiro, Norie Tachi et Yusuke Azuma. « Hydrophilic Diazirine Polymer for One-Step Photo-Fabrication of Proteins on Polypropylene Surface ». HETEROCYCLES 79, no 1 (2009) : 897. http://dx.doi.org/10.3987/com-08-s(d)60.

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