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Surface chemistry

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https://www.readbyqxmd.com/read/28822288/two-sides-of-the-coin-part-2-colloid-and-surface-science-meets-real-biointerfaces
#1
Barry W Ninham, Kåre Larsson, Pierandrea Lo Nostro
Part 1 revisited developments in lipid and surfactant self assembly over the past 40 years [1]. New concepts emerged. Here we explore how these developments can be used to make sense of and bring order to a range of complex biological phenomena. Together with Part 1, this contribution is a fundamental revision of intuition at the boundaries of Colloid Science and Biological interfaces from a perspective of nearly 50 years. We offer new insights on a unified treatment of self assembly of lipids, surfactants and proteins in the light of developments presented in Part 1...
August 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28820933/surface-chemistry-of-la0-99sr0-01nbo4-d-and-its-implication-for-proton-conduction
#2
Cheng Li, Stevin S Pramana, Na Ni, John A Kilner, Stephen J Skinner
Acceptor doped LaNbO4 is a promising electrolyte material for proton conducting fuel cell (PCFC) applications. As charge transfer processes govern device performance, the outermost surface of acceptor doped LaNbO4 will play an important role in determining the overall cell performance. However, the surface composition is poorly characterized, and the understanding of its impact on the proton exchange process is rudimentary. In this work, the surface chemistry of 1 at% Sr doped LaNbO4 (La0.99Sr0.01NbO4-d, denoted as LSNO) proton conductor is characterized using LEIS and SIMS...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28819465/chemical-control-and-spectral-fingerprints-of-electronic-coupling-in-carbon-nanostructures
#3
Jacek Kłos, Mijin Kim, Millard H Alexander, YuHuang Wang
The optical and electronic properties of atomically thin materials such as single-walled carbon nanotubes and graphene are sensitively influenced by substrates, the degree of aggregation, and the chemical environment. However, it has been experimentally challenging to determine the origin and quantify these effects. Here we use time-dependent density-functional-theory calculations to simulate these properties for well-defined molecular systems. We investigate a series of core-shell structures containing C60 enclosed in progressively larger carbon shells and their perhydrogenated or perfluorinated derivatives...
December 29, 2016: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28818703/traceable-peo-poly-ester-micelles-for-breast-cancer-targeting-the%C3%A2-effect-of-core-structure-and-targeting-peptide-on-micellar-tumor%C3%A2-accumulation
#4
Shyam M Garg, Igor M Paiva, Mohammad R Vakili, Rania Soudy, Kate Agopsowicz, Amir H Soleimani, Mary Hitt, Kamaljit Kaur, Afsaneh Lavasanifar
Traceable poly(ethylene oxide)-poly(ester) micelles were developed through chemical conjugation of a near-infrared (NIR) dye to the poly(ester) end by click chemistry. This strategy was tried for micelles with poly(ε-caprolactone) (PCL) or poly(α-benzyl carboxylate-ε-caprolactone) (PBCL) cores. The surface of both micelles was also modified with the breast cancer targeting peptide, P18-4. The results showed the positive contribution of PBCL over PCL core on micellar thermodynamic and kinetic stability as well as accumulation in primary orthotopic MDA-MB-231 tumors within 4-96 h following intravenous administration in mice...
August 4, 2017: Biomaterials
https://www.readbyqxmd.com/read/28817930/identification-of-a-new-zinc-binding-chemotype-by-fragment-screening
#5
Panagiotis K Chrysanthopoulos, Prashant Mujumdar, Lucy A Woods, Olan Dolezal, Bin Ren, Thomas S Peat, Sally-Ann Poulsen
The discovery of a new zinc binding chemotype from screening a non-biased fragment library is reported. Using the orthogonal fragment screening methods of native state mass spectrometry and surface plasmon resonance a 3-unsubstituted-2,4-oxazolidinedione fragment was found to have low micromolar binding affinity to the zinc metalloenzyme carbonic anhydrase II (CA II). This affinity approached that of fragment sized primary benzene sulfonamides, the classical zinc binding group found in most CA II inhibitors...
August 17, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28816460/coexistence-of-pinning-and-moving-on-a-contact-line
#6
Zhengmao Lu, Daniel John Preston, Dion S Antao, Yangying Zhu, Evelyn N Wang
Textured surfaces are instrumental in water repellency or fluid wicking applications, where the pinning and depinning of the liquid-gas interface plays an important role. Previous work showed that a contact line can exhibit non-uniform behavior due to heterogeneities in surface chemistry or roughness. Here, we demonstrate that such non-uniformities can be achieved even without varying the local energy barrier. Around a cylindrical pillar, an interface can reside in an intermediate state where segments of the contact line are pinned to the pillar top while the rest of the contact line moves along the sidewall...
August 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28816400/silica-modified-luminescent-lapo4-eu-lapo4-sio2-core-shell-nanorods-synthesis-structural-and-luminescent-properties
#7
Anees A Ansari
Monoclinic-type tetragonal LaPO4 :Eu (core) and LaPO4 :Eu@LaPO4 (core/shell) nanorods (NRs) were successfully prepared using a urea-based co-precipitation process under ambient conditions. An amorphous silica layer was coated around the luminescent core/shell NRs via the sol-gel process to improve their solubility and colloidal stability in aqueous and non-aqueous media. The prepared nano-products were systematically characterized by X-ray diffraction pattern, transmission electron microscopy, energy dispersive X-ray analysis, and FTIR, UV/Vis, and photoluminescence spectroscopy to examine their phase purity, crystal phase, surface chemistry, solubility and luminescence characteristics...
August 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28816311/hierarchical-core-shell-sio2-pda-biobr-microspheres-with-enhanced-visible-light-driven-photocatalytic-performance
#8
Shuai-Ru Zhu, Qi Qi, Wen-Na Zhao, Meng-Ke Wu, Yuan Fang, Kai Tao, Fei-Yan Yi, Lei Han
To explore catalysts combining highly accessible specific surface areas with low recombination of the photo-induced electron-hole pairs, a novel SiO2@PDA@BiOBr composite photocatalyst with a hierarchical core-shell structure was prepared by a facile solvothermal method. The catalyst shows a superior performance on photodegradation of Rhodamine B under visible light irradiation, especially for SiO2@PDA-2@BiOBr with the reactant kinetics constant (k = 0.0487 min(-1)). The enhanced photocatalytic performance of SiO2@PDA-2@BiOBr was ascribed to the decreased band-gap, higher surface area, and effectively photo-generated electron-hole pairs by the introduction of polydopamine (PDA)...
August 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28816302/functional-nanonetwork-structured-polymers-and-carbons-with-silver-nanoparticle-yolks-for-antibacterial-application
#9
Yanhuan Lin, Kairong Xiong, Zhitao Lu, Shaohong Liu, Zhaojie Zhang, Yuheng Lu, Ruowen Fu, Dingcai Wu
Functional nanonetwork-structured polymers and carbons with silver nanoparticle yolks (∼20 nm) were successfully fabricated via hypercrosslinking chemistry. Benefiting from the hierarchical porous nanonetwork structure and high surface areas (up to 566 m(2) g(-1)), the as-prepared nanocomposites demonstrated superior long-term antibacterial performances (e.g., 6 days).
August 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28815281/quantitative-characterization-of-colloidal-assembly-of-graphene-oxide-silver-nanoparticle-hybrids-using-aerosol-differential-mobility-coupled-mass-analyses
#10
Thai Phuong Nguyen, Wei-Chang Chang, Yen-Chih Lai, Ta-Chih Hsiao, De-Hao Tsai
In this work, we develop an aerosol-based, time-resolved ion mobility-coupled mass characterization method to investigate colloidal assembly of graphene oxide (GO)-silver nanoparticle (AgNP) hybrid nanostructure on a quantitative basis. Transmission electron microscopy (TEM) and zeta potential (ZP) analysis were used to provide visual information and elemental-based particle size distributions, respectively. Results clearly show a successful controlled assembly of GO-AgNP by electrostatic-directed heterogeneous aggregation between GO and bovine serum albumin (BSA)-functionalized AgNP under an acidic environment...
August 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28813592/3d-printed-phema-materials-for-topographical-and-biochemical-modulation-of-dorsal-root-ganglion-cell-response
#11
Adina Badea, Joselle M McCracken, Emily G Tillmaand, Mikhail Eugene Kandel, Aaron W Oraham, Molly B Mevis, Stanislav S Rubakhin, Gabriel Popescu, Jonathan V Sweedler, Ralph G Nuzzo
Understanding and controlling the interactions occurring between cells and engineered materials are central challenges towards progress in the development of biomedical devices. In this work, we describe materials for direct ink writing (DIW), an extrusion-based type of 3D printing, that embed a custom synthetic protein (RGD-PDL) within the microfilaments of 3D-hydrogel scaffolds to modify these interactions and differentially direct tissue-level organization of complex cell populations in vitro. The RGD-PDL is synthesized by modifying poly-ᴅ-lysine (PDL) to varying extents with peptides containing the integrin-binding motif Arg-Gly-Asp (RGD)...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28812873/ultrathin-manganese-based-metal-organic-framework-nanosheets-low-cost-and-energy-dense-lithium-storage-anodes-with-the-coexistence-of-metal-and-ligand-redox-activities
#12
Chao Li, Xiaoshi Hu, Wei Tong, Wensheng Yan, Xiaobing Lou, Ming Shen, Bingwen Hu
We herein demonstrate the fabrication of Mn- and Ni-based ultrathin metal-organic framework nanosheets with the same coordination mode (defined as 'Mn-UMOFNs' and 'Ni-UMOFNs', respectively) through an expedient and versatile ultrasonic approach, and scrutinize their electrochemical properties as anode materials for rechargeable lithium battery for the first time. The obtained Mn-UMOFNs with structure advantages over Ni-UMOFNs (thinner nanosheets, smaller metal-ion radius, higher specific surface area) exhibit high reversible capacity (1187 mAh g-1 at 100 mA g-1 for 100 cycles), excellent rate capability (701 mAh g-1 even at 2 A g-1), rapid Li+ diffusion coefficient (2...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28811262/probe-microscopy-methods-and-applications-in-imaging-of-biological-materials
#13
REVIEW
Alper D Ozkan, Ahmet E Topal, Fatma B Dikecoglu, Mustafa O Guler, Aykutlu Dana, Ayse B Tekinay
Atomic force microscopy is an emerging tool for investigating the biomolecular aspects of cellular interactions; however, cell and tissue analyses must frequently be performed in aqueous environment, over rough surfaces, and on complex adhesive samples that complicate the imaging process and readily facilitate the blunting or fouling of the AFM probe. In addition, the shape and surface chemistry of the probe determine the quality and types of data that can be acquired from biological materials, with certain information becoming available only within a specific range of tip lengths or diameters, or through the assistance of specific chemical or biological functionalization procedures...
August 12, 2017: Seminars in Cell & Developmental Biology
https://www.readbyqxmd.com/read/28810197/photochemical-formation-of-chitosan-stabilized-near-infrared-absorbing-silver-nanoworms-a-green-synthetic-strategy-and-activity-on-gram-negative-pathogenic-bacteria
#14
Sreekar Marpu, Samar S Kolailat, Daniel Korir, Brian L Kamras, Ratnesh Chaturvedi, Abel Joseph, Christopher M Smith, Misael C Palma, Jyoti Shah, Mohammad A Omary
A facile, single-step, non-seeded photochemical protocol for producing a new type of anisotropic silver nanostructure, "nanoworms", with curved longer dimensions and smooth, rounded edges. The nanoworms exhibit surface plasmon resonance (SPR) absorption in the near-infrared window (NIRW) region and are stabilized using biocompatible polymer chitosan, rendering biocompatibility and amplified safety for biological utility of the composition. Both NIRW-absorbing nanoworms and visible-absorbing nanospheres herein are attained exclusively by employing green chemistry principles...
August 4, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28809538/dynamic-covalent-hydrogels-for-triggered-cell-capture-and-release
#15
Fatemeh Karimi, Joe Collins, Daniel E Heath, Luke A Connal
A dual-responsive, cell capture and release surface was prepared through the incorporation of phenylboronic acid (PBA) groups into an oxime-based polyethylene glycol (PEG) hydrogel. Owing to its PEG-like properties, the unfunctionalized hydrogel was non-fouling. The use of the highly efficient oxime-click chemistry allows for the facile incorporation of commercially available 3,5-diformylphenyl boronic acid into the hydrogel matrix. Thus, the surface properties of the hydrogel were modified to enable reversible cell capture and release...
August 15, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28808724/water-and-co-co-adsorption-on-pseudomorphic-pt-films-on-ru-0001-a-low-temperature-scanning-tunneling-microscopy-study
#16
Martin Schilling, Sylvain Brimaud, R Jürgen Behm
Coadsorption of CO and water under ultrahigh vacuum (UHV) conditions can be considered as a model system for the interaction of metal surfaces with CO in an aqueous electrochemical environment. Nevertheless, this has rarely been investigated, and in particular for catalytically relevant bimetallic systems, there is hardly any information available. Here we report results of a low-temperature scanning tunneling microscopy (STM) study on the adsorption and coadsorption of CO and water on a Ru(0001) surface covered with a pseudomorphic Pt film of 2 or 3 monolayers thickness...
August 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28808674/in-situ-generated-tribomaterial-in-metal-metal-contacts-current-understanding-and-future-implications-for-implants
#17
N Espallargas, A Fischer, A Igual Muñoz, S Mischler, M A Wimmer
Artificial hip joints operate in aqueous biofluids that are highly reactive towards metallic surfaces. The reactivity at the metal interface is enhanced by mechanical interaction due to friction, which can change the near-surface structure of the metal and surface chemistry. There are now several reports in the literature about the in-situ generation of reaction films and tribo-metallurgical transformations on metal-on-metal hip joints. This paper summarizes current knowledge and provides a mechanistic interpretation of the surface chemical and metallurgical phenomena...
June 2017: Biotribology (Oxf)
https://www.readbyqxmd.com/read/28808262/generation-of-broadband-ultraviolet-frequency-entangled-photons-using-cavity-quantum-plasmonics
#18
Hisaki Oka
Application of quantum entangled photons is now extending to various fields in physics, chemistry and biology. In particular, in terms of application to molecular science, broadband ultraviolet frequency-entangled photons are desired because molecules inducing photochemical reactions of interest often have electronic transition energies in the ultraviolet region. Recent standard method for generating such entangled photons is a chirped quasi-phase-matching method, however this method is not suitable for the generation of ultraviolet frequency-entangled photons because it requires down-conversion of a photon with a wavelength shorter than ultraviolet into an entangled photon pair...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28805831/elucidating-screw-dislocation-driven-film-formation-of-sodium-thiosulphate-with-complex-hierarchical-molecular-assembly
#19
Deepak Dwivedi, Katerina Lepkova, Thomas Becker, Matthew R Rowles
Sodium thiosulphate (Na2S2O3) films were synthesized on carbon steel substrates through solution deposition, and a film formation growth mechanism is delineated in detail herein. Dislocation-driven film formation took place at the lower concentration of Na2S2O3 (0.1 M) studied, where screw dislocation loops were identified. Interestingly, we observed the co-existence of screw dislocation spiral loops and hierarchically-ordered molecular assembly in the film, and showed the importance of hierarchical morphology in the origin of screw dislocation...
August 14, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28805657/noble-metal-free-tungsten-oxide-carbon-wox-c-hybrid-nanowires-for-highly-efficient-hydrogen-evolution
#20
Changhai Liu, Yangyang Qiu, Yujian Xia, Fang Wang, Xiaocun Liu, Xuhui Jeff Sun, Qian Liang, Zhidong Chen
Developing active, stable, and low-cost electrocatalysts to generate hydrogen is a great challenge in the fields of chemistry and energy. The nonprecious metal catalysts comprised of inexpensive and earth-abundant transition metals, regarded as promising substitute for noble metal catalysts used in hydrogen evolution reaction (HER), are still practically unfeasible mainly due to unsatisfactory activity and durability. Here we report the facile two-step preparation method for WOx nanowires with high concentration of oxygen vacancies (OVs) via calcination of W-polydopamine compound precursors...
August 14, 2017: Nanotechnology
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