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https://www.readbyqxmd.com/read/28551566/silica-nanoparticles-alleviate-cadmium-toxicity-in-rice-cells-mechanisms-and-size-effects
#1
Jianghu Cui, Tongxu Liu, Fangbai Li, Jicai Yi, Chuanping Liu, Huanyun Yu
Although it was recently determined that silicon can alleviate cadmium (Cd) toxicity in rice, the effects of silicon properties and the molecular mechanisms are still unclear. Here, the effect of silica nanoparticles (SiNPs) on Cd toxicity in rice was examined using cells cultured in suspension in the presence or absence of SiNPs (19 nm, 48 nm and 202 nm). The results showed that the presence of SiNPs substantially enhanced the proportion of live cells to 95.4%, 78.6% and 66.2%, respectively, suggesting that the extent of alleviation of Cd toxicity decreased gradually with size of SiNPs...
May 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28551115/mos2-tio2-sinw-surface-as-an-effective-substrate-for-ldi-ms-detection-of-glucose-and-glutathione-in-real-samples
#2
Abderrahmane Hamdi, Ioana Silvia Hosu, Ahmed Addad, Ruben Hartkoorn, Hervé Drobecq, Oleg Melnyk, Hatem Ezzaouia, Rabah Boukherroub, Yannick Coffinier
Here, we report for the first time, the use of molybdenum disulfide/titanium oxide/silicon nanowires (MoS2/TiO2/SiNW) surfaces for SALDI-MS detection as alternative to MALDI-MS method. Silicon nanowires were fabricated by the well-known metal-assisted chemical etching process followed by the deposition of TiO2 by atomic layer deposition. MoS2 deposition was achieved through hydrothermal treatment. The MoS2/TiO2/SiNW substrate has shown high performance for the detection of small compounds of different molecular weights, including glutathione, glucose, amino acids, antibiotics to name a few...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28550276/synthetic-plasma-liquid-and-silicon-tubular-harness-based-pure-biological-transistor-amplifier-circuit
#3
Pandya Killol, Kosta Shivprasad
Kosta et al.first ever reported the development of biologic electronic components viz resistance R, capacitance C, diode D and transistor T using human tissues and human skin. In our early study, we have demonstrated the feasibility of liquid medium (synthetic blood plasma) to develop bio-transistor, bio-resistor, and bio-capacitor and combined them to form an amplifier using the metallic harness (the interconnecting copper wires and pieces).
May 26, 2017: Journal of Biomedical Research
https://www.readbyqxmd.com/read/28549710/complication-rates-observed-in-silicone-and-polyurethane-catheters-of-totally-implanted-central-venous-access-devices-implanted-in-the-upper-arm
#4
Jasmin D Busch, Maren Vens, Catherine Mahler, Jochen Herrmann, Gerhard Adam, Harald Ittrich
PURPOSE: To present frequency and types of complications related to silicone (SI) versus polyurethane (PUR) catheters of totally implanted venous access devices (TIVADs) placed in the upper arm. MATERIAL AND METHODS: A cohort of 2,491 consecutive patients with TIVADs implanted between 2006 and 2015 was retrospectively analyzed. Complications were classified according to SIR guidelines. Pearson χ(2) test was used for categorical variables, and Student t test was used for continuous variables...
May 24, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/28549214/griffith-criterion-for-nanoscale-stress-singularity-in-brittle-silicon
#5
Takashi Sumigawa, Takahiro Shimada, Shuuhei Tanaka, Hiroki Unno, Naoki Ozaki, Shinsaku Ashida, Takayuki Kitamura
Brittle materials such as silicon fail via the crack nucleation and propagation, which is characterized by the singular stress field formed near the crack tip according to Griffith or fracture mechanics theory. The applicability of these continuum-based theories is, however, uncertain and questionable in nanoscale system due to its extremely small singular stress field of only a few nanometers. Here, we directly characterize the mechanical behavior of a nano-crack via the development of in situ nanomechanical testing using a transmission electron microscope, and demonstrate that Griffith or fracture mechanics theory can be applied to even 4-nm stress singularity despite their continuum-based concept...
May 26, 2017: ACS Nano
https://www.readbyqxmd.com/read/28548483/nanoscale-junction-formation-by-gas-phase-monolayer-doping
#6
Peyman Taheri, Hossain M Fahad, Mahmut Tosun, Mark Hettick, Daisuke Kiriya, Kevin Chen, Ali Javey
A major challenge in transistor technology scaling is the formation of controlled ultra-shallow junctions with nanometer-scale thickness and high spatial uniformity. Monolayer doping (MLD) is an efficient method to form such nanoscale junctions, where the self-limiting nature of semiconductor surfaces is utilized to form adsorbed monolayers of dopant-containing molecules followed by rapid thermal annealing (RTA) to diffuse the dopants to a desired depth. Unlike ion implantation, the process does not induce crystal damage, thus making it highly attractive for nanoscale transistor processing...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28548146/inorganic-nanomaterials-for-printed-electronics-a-review
#7
REVIEW
Wei Wu
Owing to their capability of bypassing conventional high-priced and inflexible silicon based electronics to manufacture a variety of devices on flexible substrates by using large-scale and high-volume printing techniques, printed electronics (PE) have attracted increasing attention in the field of manufacturing industry for electronic devices. This simple and cost-effective approach could enhance current methods of constructing a patterned surface for nanomaterials and offer opportunities for developing fully-printed functional devices, especially offering the possibility of ubiquitous low-cost and flexible devices...
May 26, 2017: Nanoscale
https://www.readbyqxmd.com/read/28548097/scalable-focused-ion-beam-creation-of-nearly-lifetime-limited-single-quantum-emitters-in-diamond-nanostructures
#8
Tim Schröder, Matthew E Trusheim, Michael Walsh, Luozhou Li, Jiabao Zheng, Marco Schukraft, Alp Sipahigil, Ruffin E Evans, Denis D Sukachev, Christian T Nguyen, Jose L Pacheco, Ryan M Camacho, Edward S Bielejec, Mikhail D Lukin, Dirk Englund
The controlled creation of defect centre-nanocavity systems is one of the outstanding challenges for efficiently interfacing spin quantum memories with photons for photon-based entanglement operations in a quantum network. Here we demonstrate direct, maskless creation of atom-like single silicon vacancy (SiV) centres in diamond nanostructures via focused ion beam implantation with ∼32 nm lateral precision and <50 nm positioning accuracy relative to a nanocavity. We determine the Si+ ion to SiV centre conversion yield to be ∼2...
May 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28548050/reversible-crystalline-amorphous-phase-transformation-in-si-nanosheets-with-lithi-delithiation
#9
Jeong Min Park, Jae-Hyun Cho, Jung Hoon Ha, Hae-Sik Kim, Sung-Wook Kim, Jaejun Lee, Kyung Yoon Chung, Byung-Won Cho, Heon-Jin Choi
Silicon (Si) has a large theoretical capacity of 4200 mAhg(-1) and has great potential as a high-performance anode material for Li ion batteries (LIBs). Meanwhile, nanostructures can exploit the potential of Si and, accordingly, many zero-dimensional (0D) and one-dimensional (1D) Si nanostructures have been studied. Herein, we report on two-dimensional (2D) Si nanostructures, Si nanosheets (SiNSs), as anodes for LIBs. These 2D Si nanostructures, with a thickness as low 5 nm and widths of several micrometers, show reversible crystalline-amorphous phase transformations with the lithi-/delithiation by the dimensionality of morphology and large surface area...
May 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28548043/epitaxial-graphene-growth-on-fib-patterned-3c-sic-nanostructures-on-si-111-reducing-milling-damage
#10
Mojtaba Amjadipour, Jennifer MacLeod, Josh Lipton-Duffin, Francesca Iacopi, Nunzio Motta
Epitaxial growth of graphene on SiC is a scalable procedure which does not require any further transfer step, making this an ideal platform for graphene nanostructure fabrication. Focused ion beam (FIB) is a very promising tool for exploring the reduction of the lateral dimension of graphene on SiC to the nanometre scale. However, exposure of graphene to the Ga+ beam causes significant surface damage through amorphisation and contamination, preventing epitaxial graphene growth. In this paper we demonstrate that combining a protective silicon layer with FIB patterning implemented prior to graphene growth can significantly reduce the damage associated with FIB milling...
May 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28547316/preliminary-study-of-the-safety-and-efficacy-of-medium-chain-triglycerides-for-use-as-an-intraocular-tamponading-agent-in-minipigs
#11
Vincent J Soler, Camille Laurent, Frédéric Sakr, Alain Regnier, Cyrielle Tricoire, Olivier Cases, Renata Kozyraki, Jean-Yves Douet, Véronique Pagot-Mathis
PURPOSE: To date, only silicone oils and gases have the appropriate characteristics for use in vitreo-retinal surgery as vitreous substitutes with intraocular tamponading properties. This preliminary study evaluated the safety and efficacy of medium-chain triglycerides (MCTs) for use as a tamponading agent in minipigs. METHODS: In 15 minipigs, 15 right eyes underwent vitrectomies followed by injection of MCT tamponade (day 1). Two groups were defined. In Group A (ten eyes), the surgical procedure before MCT injection included induced rhegmatogenous retinal detachment (RRD), retina flattening, and retinopexy...
May 25, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28546943/treatment-of-myopic-foveoschisis-via-macular-buckling-and-vitrectomy
#12
Si-Qi Xiong, Hai-Bo Jiang, Fang-Ling Li, Yan-Xiu Li, Jie Yang, Xiao-Bo Xia, Hui-Zhuo Xu
The aim of the present study was to evaluate the efficacy and safety of the treatment of myopic foveoschisis patients using the macular buckling with L-shaped titanium plate and silicon sponge combined with vitrectomy. The data of the patients who underwent macular buckling combined with vitrectomy was collected. The study recorded the following parameters: best corrected visual acuity (BCVA), axial length, intraocular pressure, central macular thickness, and the position of the titanium plate. Following the surgery, the BCVA of the included patients were improved, whereas the axial lengths were reduced followed by resolution of the foveoschisis compared with that noted prior to the operations...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28546585/influence-of-nh3-plasma-and-ti-doping-on-ph-sensitive-ceo2-electrolyte-insulator-semiconductor-biosensors
#13
Chyuan-Haur Kao, Che-Wei Chang, Yu Tzu Chen, Wei Ming Su, Chien Cheng Lu, Chan-Yu Lin, Hsiang Chen
In this study, CeO2 pH-sensitive sensing membranes in electrolyte-insulator-semiconductor structures on silicon substrate were fabricated. To enhance sensing performance, the membrane underwent Ti doping and NH3 plasma treatment on the surface. To examine the effects of Ti doping and plasma treatment, multiple material properties evaluations were conducted using field-emission scanning electron microscopy, X-ray diffraction, atomic force microscopy, and secondary ion mass spectroscopy. Results indicate that Ti doping and plasma treatment can remove defects and enhance crystallization, thereby achieving improved pH-sensing performance of the membrane with high sensitivity, high linearity, low hysteresis voltage and low drift voltage...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28545236/thermal-characterization-of-dynamic-silicon-cantilever-array-sensors-by-digital-holographic-microscopy
#14
Marjan Zakerin, Antonin Novak, Masaya Toda, Yves Emery, Filipe Natalio, Hans-Jürgen Butt, Rüdiger Berger
In this paper, we apply a digital holographic microscope (DHM) in conjunction with stroboscopic acquisition synchronization. Here, the temperature-dependent decrease of the first resonance frequency (S₁(T)) and Young's elastic modulus (E₁(T)) of silicon micromechanical cantilever sensors (MCSs) are measured. To perform these measurements, the MCSs are uniformly heated from T₀ = 298 K to T = 450 K while being externally actuated with a piezo-actuator in a certain frequency range close to their first resonance frequencies...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28544915/pyrrole-based-poly-ionic-liquids-as-efficient-stabilizers-for-formation-of-hollow-multi-walled-carbon-nanotubes-particles
#15
Prithwish Chatterjee, Elizabeth M Nofen, Wenwen Xu, Conrad Hom, Hanqing Jiang, Lenore L Dai
Poly(ionic liquid) (PIL) derivatives with pyrrole intrinsically conducting polymer (ICP) backbones were synthesized and utilized as novel dispersants of multi-walled carbon nanotubes (MWCNTs) in various aqueous and non-aqueous systems, including polar and nonpolar solvents. This is due to the highly tunable nature of the PIL, in which the PILs of varying polarity with the same pyrrole-based polycation can be synthesized. The dispersions are exceedingly stable over many months, and with the addition of hexane, Pickering (solid-stabilized) emulsions with the PIL-stabilized MWCNTs at the droplet interfaces were formed...
April 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28544508/enhancement-of-plasma-protein-adsorption-and-osteogenesis-of-hmscs-by-functionalized-siloxane-coatings-for-titanium-implants
#16
Maria Martínez-Ibáñez, N Sanjeeva Murthy, Yong Mao, Julio Suay, Marilo Gurruchaga, Isabel Goñi, Joachim Kohn
A series of sol-gel derived silicon based coatings were developed to improve the osseointegration of commercial titanium dental implants. The osseointegration starts with a positive interaction between the implant surface and surrounding tissues, which is facilitated by the adsorption of plasma proteins onto the biomaterial surface immediately after implantation. It is likely that the enhancement of protein adsorption to titanium implants leads to a better implant/tissue integration. In addition, silica based biomaterials have been shown to promote osteoblast differentiation...
May 25, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28544164/rapid-production-of-high-purity-hydrogen-fuel-through-microwave-promoted-deep-catalytic-dehydrogenation-of-liquid-alkanes-with-abundant-metals
#17
Xiangyu Jie, Sergio Gonzalez-Cortes, Tiancun Xiao, Jiale Wang, Benzhen Yao, Daniel R Slocombe, Hamid A Al-Megren, Jonathan R Dilworth, John M Thomas, Peter P Edwards
Hydrogen as an energy carrier promises a sustainable energy revolution. However, one of the greatest challenges for any future hydrogen economy is the necessity for large scale hydrogen production not involving concurrent CO2 production. The high intrinsic hydrogen content of liquid-range alkane hydrocarbons (including diesel) offers a potential route to CO2 -free hydrogen production through their catalytic deep dehydrogenation. We report here a means of rapidly liberating high-purity hydrogen by microwave-promoted catalytic dehydrogenation of liquid alkanes using Fe and Ni particles supported on silicon carbide...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544030/trapping-a-silicon-i-radical-with-carbenes-a-cationic-caac-silicon-i-radical-and-an-nhc-parent-silyliumylidene-cation
#18
Yan Li, Yuk-Chi Chan, Bi-Xiang Leong, Yongxin Li, Emma Richards, Indu Purushothaman, Susmita De, Pattiyil Parameswaran, Cheuk-Wai So
The trapping of a silicon(I) radical with N-heterocyclic carbenes is described. The reaction of the cyclic (alkyl)(amino) carbene [cAACMe ] (cAACMe =:C(CMe2 )2 (CH2 )NAr, Ar=2,6-iPr2 C6 H3 ) with H2 SiI2 in a 3:1 molar ratio in DME afforded a mixture of the separated ion pair [(cAACMe )2 Si:(.) ](+) I(-) (1), which features a cationic cAAC-silicon(I) radical, and [cAACMe -H](+) I(-) . In addition, the reaction of the NHC-iodosilicon(I) dimer [IAr (I)Si:]2 (IAr =:C{N(Ar)CH}2 ) with 4 equiv of IMe (:C{N(Me)CMe}2 ), which proceeded through the formation of a silicon(I) radical intermediate, afforded [(IMe )2 SiH](+) I(-) (2) comprising the first NHC-parent-silyliumylidene cation...
May 24, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28542580/endovascular-stentectomy-using-the-snare-over-stent-retriever-sos-technique-an-experimental-feasibility-study
#19
Tareq Meyer, Omid Nikoubashman, Lisa Kabelitz, Marguerite Müller, Ahmed Othman, Saif Afat, Martin Kramer, Martin Wiesmann, Marc A Brockmann, Carolin Brockmann
Feasibility of endovascular stentectomy using a snare over stent-retriever (SOS) technique was evaluated in a silicon flow model and an in vivo swine model. In vitro, stentectomy of different intracranial stents using the SOS technique was feasible in 22 out of 24 (92%) retrieval maneuvers. In vivo, stentectomy was successful in 10 out of 10 procedures (100%). In one case self-limiting vasospasm was observed angiographically as a technique related complication in the animal model. Endovascular stentectomy using the SOS technique is feasible in an experimental setting and may be transferred to a clinical scenario...
2017: PloS One
https://www.readbyqxmd.com/read/28541046/radical-silyldifluoromethylation-of-electron-deficient-alkenes
#20
Vyacheslav I Supranovich, Vitalij V Levin, Marina I Struchkova, Alexander A Korlyukov, Alexander D Dilman
A reaction of bromo- and iododifluoromethyl-substituted silanes with electron-deficient alkenes in the presence of an N-heterocyclic carbene borane complex is described. The reaction is performed under irradiation with light-emitting diodes and proceeds via a radical chain mechanism. The resulting products, the functionalized silicon reagents, can undergo chemoselective transformations involving either the silyldifluoromethyl fragment or the functional group.
May 25, 2017: Organic Letters
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