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RSC Advances

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https://www.readbyqxmd.com/read/28066547/holographic-direct-pulsed-laser-writing-of-two-dimensional-nanostructures
#1
Bader AlQattan, Haider Butt, Aydin Sabouri, Ali K Yetisen, Rajib Ahmed, Nasim Mahmoodi
The development of accurate and rapid techniques to produce nanophotonic structures is essential in data storage, sensors, and spectroscopy. Existing bottom-up and top-down approaches to fabricate nanophotonic devices are high cost and time consuming, limiting their mass manufacturing and practical applications. Here, we demonstrate a strategy to rapidly create 25-40 nm thick 1/2D Au-Ti nanopatterns using holographic direct laser interference patterning (DLIP). Pulses of an Nd:YAG laser (1064 nm) in holographic Denisyuk reflection mode were used to create ablative interference fringes...
December 4, 2016: RSC Advances
https://www.readbyqxmd.com/read/28066545/predicting-signatures-of-anisotropic-resonance-energy-transfer-in-dye-functionalized-nanoparticles
#2
Gabriel Gil, Stefano Corni, Alain Delgado, Andrea Bertoni, Guido Goldoni
Resonance energy transfer (RET) is an inherently anisotropic process. Even the simplest, well-known Förster theory, based on the transition dipole-dipole coupling, implicitly incorporates the anisotropic character of RET. In this theoretical work, we study possible signatures of the fundamental anisotropic character of RET in hybrid nanomaterials composed of a semiconductor nanoparticle (NP) decorated with molecular dyes. In particular, by means of a realistic kinetic model, we show that the analysis of the dye photoluminescence difference for orthogonal input polarizations reveals the anisotropic character of the dye-NP RET which arises from the intrinsic anisotropy of the NP lattice...
November 13, 2016: RSC Advances
https://www.readbyqxmd.com/read/28066544/controlling-deposition-of-nanoparticles-by-tuning-surface-charge-of-sio2-by-surface-modifications
#3
Johnas Eklöf, Tina Gschneidtner, Samuel Lara-Avila, Kim Nygård, Kasper Moth-Poulsen
The self-assembly of nanoparticles on substrates is relevant for a variety of applications such as plasmonics, sensing devices and nanometer-sized electronics. We investigate the deposition of 60 nm spherical Au nanoparticles onto silicon dioxide (SiO2) substrates by changing the chemical treatment of the substrate and by that altering the surface charge. The deposition is characterized by scanning electron microscopy (SEM). Kelvin probe force microscopy (KPFM) was used to characterize the surface workfunction...
November 13, 2016: RSC Advances
https://www.readbyqxmd.com/read/28066549/synthesis-of-dimeric-analogs-of-adenophostin-a-that-potently-evoke-ca-2-release-through-ip3-receptors
#4
Amol M Vibhute, Poornenth Pushpanandan, Maria Varghese, Vera Koniecnzy, Colin W Taylor, Kana M Sureshan
Inositol 1,4,5-trisphosphate receptors (IP3Rs) are tetrameric intracellular channels through which many extracellular stimuli initiate the Ca(2+) signals that regulate diverse cellular responses. There is considerable interest in developing novel ligands of IP3R. Adenophostin A (AdA) is a potent agonist of IP3R and since some dimeric analogs of IP3R ligands are more potent than the corresponding monomer; we considered whether dimeric AdA analogs might provide agonists with increased potency. We previously synthesized traizolophostin, in which a simple triazole replaced the adenine of AdA, and showed it to be equipotent to AdA...
November 3, 2016: RSC Advances
https://www.readbyqxmd.com/read/28018581/effect-of-the-chemical-composition-of-filter-media-on-the-microbial-community-in-wastewater-biofilms-at-different-temperatures
#5
Iffat Naz, Douglas Hodgson, Ann Smith, Julian Marchesi, Safia Ahmed, Claudio Avignone-Rossa, Devendra P Saroj
This study investigates the microbial community composition in the biofilms grown on two different support media in fixed biofilm reactors for aerobic wastewater treatment, using next generation sequencing (NGS) technology. The chemical composition of the new type of support medium (TDR) was found to be quite different from the conventionally used support medium (stone). The analysis of 16S rRNA gene fragments recovered from the laboratory scale biofilm system show that biofilm support media and temperature conditions influence bacterial community structure and composition...
November 1, 2016: RSC Advances
https://www.readbyqxmd.com/read/27774145/nafion-stabilised-bimetallic-pt-cr-nanoparticles-as-electrocatalysts-for-proton-exchange-membrane-fuel-cells-pemfcs
#6
G Gupta, S Sharma, P M Mendes
The current study investigated the unique combination of alloying (Pt with Cr) and Nafion stabilisation to reap the benefits of catalyst systems with enhanced catalytic activity and improved durability in PEMFCs. Pt-Cr alloy nanoparticles stabilised with Nafion were chosen in the current study owing to their higher stability in acidic and oxidising media at high temperatures compared to other Pt-transition metal alloys (e.g. Pt-Ni, Pt-Co). Two different precursor : reducing agent (1 : 10 and 1 : 20) ratios were used in order to prepare two different alloys, denoted as Pt-Cr 10 and Pt-Cr 20...
September 15, 2016: RSC Advances
https://www.readbyqxmd.com/read/28066548/nanomechanical-properties-of-protein-dna-layers-with-different-oligonucleotide-tethers
#7
Cristina Gutiérrez Sánchez, Qiang Su, Sabine Wenderhold-Reeb, Gilbert Nöll
The multi-ligand binding flavoprotein dodecin is reconstituted on top of flavin-terminated oligonucleotide monolayers. A detailed quartz crystal microbalance with a dissipation monitoring (QCM-D) study showing how the length and flexibility of the oligonucleotide tethers influence the stability and the viscoelastic properties of the resulting DNA-protein layers is presented. Relatively dense protein layers can be obtained, if the length of the tethers is in the same range as the diameter of dodecin. When significantly longer tethers are used, less dense layers are formed...
June 24, 2016: RSC Advances
https://www.readbyqxmd.com/read/27019705/tuning-the-nitric-oxide-release-from-cpo-27-mofs
#8
Damiano Cattaneo, Stewart J Warrender, Morven J Duncan, Christopher J Kelsall, Mary K Doherty, Phillip D Whitfield, Ian L Megson, Russell E Morris
Nitric oxide (NO) storage and release measurements have been recorded for Ni-doped CPO-27 (Mg) and CPO-27 (Zn), and the biological effect of the released NO was assessed in porcine coronary artery relaxation tests. The results indicate that the doping strategy leads to increased levels of NO storage and delivery compared to the parent materials and that the NO dosage and biological response can be tuned via this approach to suit the requirements of particular applications.
February 13, 2016: RSC Advances
https://www.readbyqxmd.com/read/27019704/characteristics-and-in-vitro-response-of-thin-hydroxyapatite-titania-films-produced-by-plasma-electrolytic-oxidation-of-ti-alloys-in-electrolytes-with-particle-additions
#9
W K Yeung, I V Sukhorukova, D V Shtansky, E A Levashov, I Y Zhitnyak, N A Gloushankova, P V Kiryukhantsev-Korneev, M I Petrzhik, A Matthews, A Yerokhin
The enhancement of the biological properties of Ti by surface doping with hydroxyapatite (HA) is of great significance, especially for orthodontic applications. This study addressed the effects of HA particle size in the electrolyte suspension on the characteristics and biological properties of thin titania-based coatings produced on Ti-6Al-4V alloy by plasma electrolytic oxidation (PEO). Detailed morphological investigation of the coatings formed by a single-stage PEO process with two-step control of the electrical parameters was performed using the Minkowski functionals approach...
February 12, 2016: RSC Advances
https://www.readbyqxmd.com/read/27019707/using-a-biomimetic-membrane-surface-experiment-to-investigate-the-activity-of-the-magnetite-biomineralisation-protein-mms6
#10
Scott M Bird, Andrea E Rawlings, Johanna M Galloway, Sarah S Staniland
Magnetotactic bacteria are able to synthesise precise nanoparticles of the iron oxide magnetite within their cells. These particles are formed in dedicated organelles termed magnetosomes. These lipid membrane compartments use a range of biomineralisation proteins to nucleate and regulate the magnetite crystallisation process. A key component is the membrane protein Mms6, which binds to iron ions and helps to control the formation of the inorganic core. We have previously used Mms6 on gold surfaces patterned with a self-assembled monolayer to successfully produce arrays of magnetic nanoparticles...
January 29, 2016: RSC Advances
https://www.readbyqxmd.com/read/28217300/biomimetic-cross-reactive-sensor-arrays-prospects-in-biodiagnostics
#11
J E Fitzgerald, H Fenniri
Biomimetic cross-reactive sensor arrays have been used to detect and analyze a wide variety of vapour and liquid components in applications such as food science, public health and safety, and diagnostics. As technology has advanced over the past three decades, these systems have become selective, sensitive, and affordable. Currently, the need for non-invasive and accurate devices for early disease diagnosis remains a challenge. This review provides an overview of the various types of Biomimetic cross-reactive sensor arrays (also referred to as electronic noses and tongues in the literature), their current use and future directions, and an outlook for future technological development...
2016: RSC Advances
https://www.readbyqxmd.com/read/28066546/sugar-based-amphiphiles-easily-accessible-and-efficient-crude-oil-spill-thickening-agents
#12
Malick Samateh, Adiyala Vidyasagar, Swapnil R Jadhav, George John
In this work, we demonstrate the use of biomass for the catalytic production of phase-selective gelators (PSGs) as a cost-effective, environmentally benign and ideal method for crude oil spill remediation, as well as execute the study exclusively in crude oil. The use of PSGs has recently provided great promise relative to that of their traditional counterparts. However, the use of PSGs with crude oil is much more complicated due to its complex composition. All of the current PSG methods are demonstrated with refined oils or do not employ eco-friendly methods like enzymatic synthesis...
2016: RSC Advances
https://www.readbyqxmd.com/read/28042472/toward-production-of-pure-13-c-hyperpolarized-metabolites-using-heterogeneous-parahydrogen-induced-polarization-of-ethyl-1-13-c-acetate
#13
K V Kovtunov, D A Barskiy, O G Salnikov, R V Shchepin, A M Coffey, L M Kovtunova, V I Bukhtiyarov, I V Koptyug, E Y Chekmenev
Here, we report the production of (13)C-hyperpolarized ethyl acetate via heterogeneously catalyzed pairwise addition of parahydrogen to vinyl acetate over TiO2-supported rhodium nanoparticles, followed by magnetic field cycling. Importantly, the hyperpolarization is demonstrated even at the natural abundance of (13)C isotope (ca. 1.1%) along with the easiest separation of the catalyst from the hyperpolarized liquid.
2016: RSC Advances
https://www.readbyqxmd.com/read/27920903/toward-clean-suspended-cvd-graphene
#14
Alexander Yulaev, Guangjun Cheng, Angela R Hight Walker, Ivan V Vlassiouk, Alline Myers, Marina S Leite, Andrei Kolmakov
The application of suspended graphene as electron transparent supporting media in electron microscopy, vacuum electronics, and micromechanical devices requires the least destructive and maximally clean transfer from their original growth substrate to the target of interest. Here, we use thermally evaporated anthracene films as the sacrificial layer for graphene transfer onto an arbitrary substrate. We show that clean suspended graphene can be achieved via desorbing the anthracene layer at temperatures in the 100 °C to 150 °C range, followed by two sequential annealing steps for the final cleaning, using Pt catalyst and activated carbon...
2016: RSC Advances
https://www.readbyqxmd.com/read/27920902/insulator-quantum-hall-transitionin-monolayer-epitaxial-graphene
#15
Lung-I Huang, Yanfei Yang, Randolph E Elmquist, Shun-Tsung Lo, Fan-Hung Liu, Chi-Te Liang
We report on magneto-transport measurements on low-density, large-area monolayer epitaxial graphene devices grown on SiC. We observe temperature (T)-independent crossing points in the longitudinal resistivity ρxx, which are signatures of the insulator-quantum Hall (I-QH) transition, in all three devices. Upon converting the raw data into longitudinal and Hall conductivities σxx and σxy, in the most disordered device, we observed T-driven flow diagram approximated by the semi-circle law as well as the T-independent point in σxy near e(2)/h...
2016: RSC Advances
https://www.readbyqxmd.com/read/27895899/oxidatively-degradable-poly-thioketal-urethane-ceramic-composite-bone-cements-with-bone-like-strength
#16
Madison A P McEnery, Sichang Lu, Mukesh K Gupta, Katarzyna J Zienkiewicz, Joseph C Wenke, Kerem N Kalpakci, Daniel Shimko, Craig L Duvall, Scott A Guelcher
Synthetic bone cements are commonly used in orthopaedic procedures to aid in bone regeneration following trauma or disease. Polymeric cements like PMMA provide the mechanical strength necessary for orthopaedic applications, but they are not resorbable and do not integrate with host bone. Ceramic cements have a chemical composition similar to that of bone, but their brittle mechanical properties limit their use in weight-bearing applications. In this study, we designed oxidatively degradable, polymeric bone cements with mechanical properties suitable for bone tissue engineering applications...
2016: RSC Advances
https://www.readbyqxmd.com/read/27822364/new-withanolides-with-trail-sensitizing-effect-from-physalis-pubescens-l
#17
Li-Xia Chen, Gui-Yang Xia, Hao He, Jian Huang, Feng Qiu, Xiao-Lin Zi
Physalis pubescens L. plant produces nutritious and healthy fruits, called husk tomato or hairy ground cherry. However, its bioactive components are largely unknown. Four new withanolide steroids (1-4) together with one known withanolide (5) were isolated from the extract of P. pubescens L. and their chemical structures were established by extensive spectroscopic analyses. Compounds 1, 3 and 5 showed potent growth inhibitory effects against four human renal cell carcinoma (RCC) cell lines (i.e. 786-O, A-498, Caki-2 and ACHN)...
2016: RSC Advances
https://www.readbyqxmd.com/read/27774146/photovoltaically-self-charging-cells-with-wo3%C3%A2-h2o-cnts-pvdf-composite
#18
Xuezhen Huang, Xi Zhang, Hongrui Jiang
Two-electrode photovoltaically self-charging cells (PSCs) possess compact structures for both energy conversion and storage with shared electrolyte and electrodes. It remains challenging to develop PSCs that are efficient in both energy conversion and storage. In this work, WO3·H2O nanoplates were synthesized by a modified acid-directed hydrothermal process and used to prepare a WO3·H2O/CNTs/PVDF composite film for energy storage in PSCs. The method with the assistance of polyethylenimine was essential to form smaller sized WO3·H2O nanoplates, thus larger surface area and higher columbic efficiency in cyclic voltammetry tests...
2016: RSC Advances
https://www.readbyqxmd.com/read/27774144/self-strengthening-hybrid-dental-adhesive-via-visible-light-irradiation-triple-polymerization
#19
Linyong Song, Qiang Ye, Xueping Ge, Anil Misra, Candan Tamerler, Paulette Spencer
A self-strengthening methacrylate-based dental adhesive system was developed by introducing an epoxy cyclohexyl trimethoxysilane (TS) which contains both epoxy and methoxysilyl functional groups. The experimental formulation, HEMA/BisGMA/TS (22.5/27.5/50, wt%), was polymerized by visible-light. Real-time Fourier transform infrared spectroscopy (FTIR) was used to investigate in situ the free radical polymerization of methacrylate, ring-opening cationic polymerization of epoxy, and photoacid-induced sol-gel reactions...
2016: RSC Advances
https://www.readbyqxmd.com/read/27774143/a-facile-approach-to-upconversion-crystalline-caf2-yb-3-tm-3-msio2-nanospheres-for-tumor-therapy
#20
Yangyang Li, Yurong Zhou, Xiang Li, Jihong Sun, Zhaohui Ren, Wengjian Wen, Xiaoming Yang, Gaorong Han
A new facile approach, namely chemical-assisted sol-gel growth (CASGG), was successfully developed to induce the formation of fine CaF2:Yb(3+), Tm(3+) nanocrytals within the pore channels of mesoporous silica (mSiO2) nanoparticles. A series of upconversion photoluminescent crystalline CaF2:Yb(3+),Tm(3+)@mSiO2 nanospheres with controlled diameters from (~)65 nm to (~)290 nm were fabricated. All nanospheres presented sound cyto-compatibility and unique ratiometric spectral monitoring functionalities for drug release kinetics...
2016: RSC Advances
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