keyword
MENU ▼
Read by QxMD icon Read
search

nano

keyword
https://www.readbyqxmd.com/read/28728043/autofocus-on-moving-object-in-scanning-electron-microscope
#1
Andrey V Kudryavtsev, Sounkalo Dembélé, Nadine Piat
The sharpness of the images coming from a Scanning Electron Microscope (SEM) is a very important property for many computer vision applications at micro- and nanoscale. It represents how much object details are distinctive in the images: the object may be perceived sharp or blurred. Image sharpness highly depends on the value of focal distance, or working distance in the case of the SEM. Autofocus is the technique allowing to automatically adjust the working distance to maximize the sharpness. Most of the existing algorithms allows working only with a static object which is enough for the tasks of visualization, manual microanalysis or microcharacterization...
July 12, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28728033/deposition-pattern-and-tracer-particle-motion-of-evaporating-multi-component-sessile-droplets
#2
Muhammad Amjad, Yang Yang, Ghulam Raza, Hui Gao, Jun Zhang, Leping Zhou, Xiaoze Du, Dongsheng Wen
The understanding of near-wall motion, evaporation behavior and dry pattern of sessile nanofluid droplets is fundamental to a wide range of applications such as painting, spray drying, thin film coating, fuel injection and inkjet printing. However, a deep insight into the heat transfer, fluid flow, near-wall particle velocity and their effects on the resulting dry patterns is still much needed to take the full advantage of these nano-sized particles in the droplet. This work investigates the effect of direct absorptive silicon/silver (Si/Ag) hybrid nanofluids via two experiments...
July 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28727785/novel-crispr-cas9-gene-drive-constructs-reveal-insights-into-mechanisms-of-resistance-allele-formation-and-drive-efficiency-in-genetically-diverse-populations
#3
Jackson Champer, Riona Reeves, Suh Yeon Oh, Chen Liu, Jingxian Liu, Andrew G Clark, Philipp W Messer
A functioning gene drive system could fundamentally change our strategies for the control of vector-borne diseases by facilitating rapid dissemination of transgenes that prevent pathogen transmission or reduce vector capacity. CRISPR/Cas9 gene drive promises such a mechanism, which works by converting cells that are heterozygous for the drive construct into homozygotes, thereby enabling super-Mendelian inheritance. Although CRISPR gene drive activity has already been demonstrated, a key obstacle for current systems is their propensity to generate resistance alleles, which cannot be converted to drive alleles...
July 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28727575/surface-energy-tunable-iso-decyl-acrylate-based-molds-for-low-pressure-nano-imprint-lithography
#4
Hyowon Tak, Dongha Tahk, Chanho Jeong, Sori Lee, Tae-Il Kim
We presented surface energy-tunable nanoscale molds for unconventional lithography. The mold is highly robust, transparent, has a minimized haze, does not contain additives, and is a non-fluorinated IDA Isodecyl acrylate (IDA) and Trimethylolpropane Triacrylate (TMPTA) based polymer. By changing the mixing ratio of the polymer components, the cross-linking density, mechanical modulus, and surface energy (crucial factors in low pressure (1~2×105 N/m2) nanoimprint lithography (LP-NIL)), can be controlled. To verify these properties of the molds, we also characterized the surface energy by measuring the contact angles and calculating the work of adhesion among the wafer, polymer film, and mold for successful demolding in nanoscale structures...
July 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28727443/plasmonic-thermal-decomposition-digestion-of-proteins-a-rapid-on-surface-protein-digestion-technique-for-mass-spectrometry-imaging
#5
Rong Zhou, Franco Basile
A method based on plasmon surface resonance absorption and heating was developed to perform a rapid on-surface protein thermal decomposition and digestion suitable for imaging MS and/or profiling. This photo-thermal process or plasmonic thermal decomposition/digestion (plasmonic-TDD) method incorporates a continuous wave (CW) laser excitation and gold nanoparticles (Au-NPs) to induce known thermal decomposition reactions that cleave peptides and proteins specifically at the C-terminus of aspartic acid and at the N-terminus of cysteine...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28727440/sensitization-of-nanocrystalline-metal-oxides-with-a-phosphonate-functionalized-perylene-diimide-for-photoelectrochemical-water-oxidation-with-a-coo%C3%A2-catalyst
#6
Joel Thomas Kirner, Richard G Finke
A planar organic thin-film composed of a perylene diimide dye (N,N´-bis(phosphonomethyl)-3,4,9,10-perylenediimide, PMPDI) with photoelectrochemically deposited cobalt oxide (CoOx) catalyst was previously shown to photoelectrochemically oxidize water (DOI: 10.1021/am405598w). Herein, the same PMPDI dye is studied for the sensitization of different nanostructured metal oxide (nano-MOₓ) films in a dye-sensitized photoelectrochemical cell architecture. Dye adsorption kinetics and saturation decreases in the order TiO₂ > SnO₂ > WO₃...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28727409/plasmonic-nano-oven-by-concatenation-of-multishell-photo-thermal-enhancement
#7
Lijun Meng, Renwen Yu, Min Qiu, F Javier Garcia de Abajo
Metallodielectric multishell nanoparticles are capable of hosting collective plasmon oscillations distributed among different metallic layers, which result in large near-field enhancement at specific regions of the structure, where light absorption is maximized. We exploit this capability of multishell nanoparticles, combined with thermal boundary resistances and spatial tailoring of the optical near fields, to design plasmonic nano-ovens capable of achieving high temperatures at the core region using moderate illumination intensities...
July 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28727251/degree-of-conversion-and-cross-link-density-within-a-resin-matrix-composite
#8
Afnan O Al-Zain, George J Eckert, Henry Lukic, Spiro J Megremis, Jeffrey A Platt
The aims of this study were to profile light radiated from two light-curing units (LCUs) and evaluate profile relationship to polymerization patterns within a resin-matrix composite (RMC). Beam profiles of one multiple emission peak light-emitting-diode and one quartz-tungsten-halogen curing-unit were measured using a beam profiler/spectrometer system. A camera-based profiler and an integrating sphere/spectrometer assembly were used to evaluate each LCU beam. Polymerization patterns within a nano-hybrid RMC were investigated using a mapping approach by assessing the degree of conversion utilizing micro-Raman spectroscopy and indirectly estimating cross-link-density by repeated microhardness testing before and after exposure to ethanol (%KH reduction, n = 3)...
July 20, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28726902/limiting-the-valence-advancements-and-new-perspectives-on-patchy-colloids-soft-functionalized-nanoparticles-and-biomolecules
#9
Emanuela Bianchi, Barbara Capone, Ivan Coluzza, Lorenzo Rovigatti, Peter D J van Oostrum
Limited bonding valence, usually accompanied by well-defined directional interactions and selective bonding mechanisms, is nowadays considered among the key ingredients to create complex structures with tailored properties: even though isotropically interacting units already guarantee access to a vast range of functional materials, anisotropic interactions can provide extra instructions to steer the assembly of specific architectures. The anisotropy of effective interactions gives rise to a wealth of self-assembled structures both in the realm of suitably synthesized nano- and micro-sized building blocks and in nature, where the isotropy of interactions is often a zero-th order description of the complicated reality...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28726546/nanotopographic-influence-on-the-in-vitro-behavior-of-induced-pluripotent-stem-cells
#10
Ji-Yun Ko, Hyun-Jik Oh, Jimin Lee, Gun-Il Im
While the influence of nanotopography on stem cell behavior have been extensively investigated on adult stem cells, far fewer studies have investigated the interaction of induced pluripotent stem cells (iPSC) with various nanotopographical patterns. The purpose of this study was to identify nanopatterns that can influence the stemness and proliferation as well as the adhesive properties in iPSCs, and thereby explore the feasibility of applying these nano-features for regenerative medicine. Three kinds of nanopatterns were fabricated from polydimethylsiloxane (PDMS) membranes, irregular patterned membrane (IPM), groove patterned membrane (GPM), and post patterned membrane (PPM), in addition to flat patterned membrane (FPM) which did not have any nanotopographic features and was used as the control pattern...
July 20, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28725934/-scaffold-based-bone-tissue-engineering
#11
REVIEW
B M Holzapfel, M Rudert, D W Hutmacher
Tissue engineering provides the possibility of regenerating damaged or lost osseous structures without the need for permanent implants. Within this context, biodegradable and bioresorbable scaffolds can provide structural and biomechanical stability until the body's own tissue can take over their function. Additive biomanufacturing makes it possible to design the scaffold's architectural characteristics to specifically guide tissue formation and regeneration. Its nano-, micro-, and macro-architectural properties can be tailored to ensure vascularization, oxygenation, nutrient supply, waste exchange, and eventually ossification not only in its periphery but also in its center, which is not in direct contact with osteogenic elements of the surrounding healthy tissue...
July 19, 2017: Der Orthopäde
https://www.readbyqxmd.com/read/28725906/covalent-bonding-assisted-nanotransfer-lithography-for-the-fabrication-of-plasmonic-nano-optical-elements
#12
Soon Hyoung Hwang, Sohee Jeon, Myung Ju Kim, Dae-Geun Choi, Jun-Hyuk Choi, Joo-Yun Jung, Kwang-Seop Kim, Jihye Lee, Jun Ho Jeong, Jae Ryoun Youn
Many high-resolution patterning techniques have been developed to realize nano- and microscale applications of electric devices, sensors, and transistors. However, conventional patterning methods based on photo or e-beam lithography are not employed to fabricate optical elements of high aspect ratio and a sub-100 nm scale due to the limit of resolution, high costs and low throughput. In this study, covalent bonding-assisted nanotransfer lithography (CBNL) was proposed to fabricate various structures of high resolution and high aspect ratio at low cost by a robust and fast chemical reaction...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28725006/diffusive-displacive-deformations-and-local-phase-transformation-govern-the-mechanics-of-layered-crystals-the-case-study-of-tobermorite
#13
Lei Tao, Rouzbeh Shahsavari
Understanding the deformation mechanisms underlying the mechanical behavior of materials is the key to fundamental and engineering advances in materials' performance. Herein, we focus on crystalline calcium-silicate-hydrates (C-S-H) as a model system with applications in cementitious materials, bone-tissue engineering, drug delivery and refractory materials, and use molecular dynamics simulation to investigate its loading geometry dependent mechanical properties. By comparing various conventional (e.g. shear, compression and tension) and nano-indentation loading geometries, our findings demonstrate that the former loading leads to size-independent mechanical properties while the latter results in size-dependent mechanical properties at the nanometer scales...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724999/x-ray-phase-contrast-tomography-reveals-early-vascular-alterations-and-neuronal-loss-in-a-multiple-sclerosis-model
#14
A Cedola, A Bravin, I Bukreeva, M Fratini, A Pacureanu, A Mittone, L Massimi, P Cloetens, P Coan, G Campi, R Spanò, F Brun, V Grigoryev, V Petrosino, C Venturi, M Mastrogiacomo, Nicole Kerlero de Rosbo, A Uccelli
The degenerative effects of multiple sclerosis at the level of the vascular and neuronal networks in the central nervous system are currently the object of intensive investigation. Preclinical studies have demonstrated the efficacy of mesenchymal stem cell (MSC) therapy in experimental autoimmune encephalomyelitis (EAE), the animal model for multiple sclerosis, but the neuropathology of specific lesions in EAE and the effects of MSC treatment are under debate. Because conventional imaging techniques entail protocols that alter the tissues, limiting the reliability of the results, we have used non-invasive X-ray phase-contrast tomography to obtain an unprecedented direct 3D characterization of EAE lesions at micro-to-nano scales, with simultaneous imaging of the vascular and neuronal networks...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724940/dispersive-2d-cherenkov-radiation-on-a-dielectric-nano-film
#15
Weihao Liu
We report a modified two-dimensional Cherenkov radiation, which occurs on a high-index dielectric nano-film driven by uniformly moving electron-beam. It is essentially different from the ordinary Cherenkov radiation in that, in the nondispersive medium, it shows unique dispersion characteristics-the waves with higher frequencies radiate at larger Cherenkov angles. Its radiation frequency and direction are essentially determined by structure parameters as well as the beam-velocity. By means of fully electromagnetic simulations and theoretical analyses, we explored the mechanism and requirements of this radiation...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723615/nanoformulations-of-curcumin-an-emerging-paradigm-for-improved-remedial-application
#16
REVIEW
Meeta Gera, Neelesh Sharma, Mrinmoy Ghosh, Do Luong Huynh, Sung Jin Lee, Taesun Min, Taeho Kwon, Dong Kee Jeong
Curcumin is a natural polyphenol and essential curcuminoid derived from the rhizome of the medicinal plant Curcuma longa (L.) is universally acknowledged as "Wonder drug of life". It is a vital consumable and restorative herb, commonly keened for several ailments such as cancer, arthritis, pain, bruises, gastrointestinal quandaries, swelling and much more. Despite its enormous curative potential, the poor aqueous solubility and consequently, minimal systemic bioavailability with rapid degradation are some of the major factors which restrict the utilization of curcumin at medical perspective...
July 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28723407/nano-lipid-drug-conjugate-an-integrated-review
#17
REVIEW
Piya Adhikari, Paulami Pal, Anup Kr Das, Subhabrata Ray, Arpita Bhattacharjee, Bhaskar Mazumder
Lipid-drug conjugates (LDC), which may also be addressed as lipoidal prodrug, have the therapeutic actives chemically bound to a lipid moiety like fatty acids or phospholipids. Fabricated in nano-size, lipid-drug conjugate forms another breed of lipid nanoparticles. LDCs are prepared in order to increase the drug loading and hence prevent leakage of a highly polar drug from a lipophilic matrix. In turn, it assists to achieve active targeting of therapeutics with reduced side effect by altering the pharmacokinetic profile of the drug...
July 16, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28723110/portable-sensor-for-the-detection-of-choline-and-its-derivatives-based-on-silica-isoporous-membrane-and-gellified-nanointerfaces
#18
Lisiqi Xie, Xiao Huang, Bin Su
A portable amperometric ion sensor was fabricated by integrating silica isoporous membrane (SIM) and organogel composed of polyvinyl chloride and 1,2-dichloroethane (PVC-DCE) on a 3D-printed polymer chip. The detection of ionic species in aqueous samples could be accomplished by adding a microliter of sample droplet to the sensor and by identifying the ion-transfer potential and current magnitude at the water/organogel interface array templated by SIM. Thanks to the ultrasmall channel size (2-3 nm in diameter), high channel density (4 × 10(8) μm(-2)), and ultrathin thickness (80 nm) of SIM, the ensemble of nanoscopic water/organogel (nano-W/Gel) interface array behaved like a microinterface with two back-to-back hemispherical mass diffusion zones...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723105/electroosmotic-effects-on-sample-concentration-at-the-interface-of-a-micro-nanochannel
#19
Honggu Chun
Electroosmotic effect on electrokinetic trapping of analytes was investigated at the micro/nanochannel interface for a series of 1-D glass nanochannels with depths of 72, 54, 29, and 9 nm. The electric double layer approaches overlap conditions as the nanochannel depth decreases suppressing the electroosmotic flow. The nanochannels' electroosmotic flow (μeo(nano) ) were determined and compared to the analyte's (fluorescein) electrophoretic mobility (μep). For the instances where μeo(nano) > μep, the analytes were concentrated on the anodic side of the nanochannel (72, 54, and 29 nm deep channels) whereas when μeo(nano) < μep, the analyte was concentrated on the cathodic side of the nanochannel (9 nm deep channel)...
July 19, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28723102/insight-into-copper-catalysis-in-situ-formed-nano-cu2o-in-suzuki-miyaura-cross-coupling-of-aryl-indolyl-boronates
#20
Ganapathy Ranjani, Rajagopal Nagarajan
A ligand-free copper catalyzed Suzuki-Miyaura coupling of 3,5-diiodopyridine with aryl and indole boronates has been explored in good to excellent yields. In situ generation of nano-Cu2O from CuCl2 under the reaction conditions has been discovered for the first time. The generality of the reaction was further demonstrated by the arylation of 5-iodopyrimidine, iodopyridines, iodobenzenes, and diiodobenzenes and resulted in good to moderate yields. Moreover, bisindole alkaloid Scalaridine A has been successfully synthesized in 60% overall yield...
July 19, 2017: Organic Letters
keyword
keyword
4214
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"