Researchers discover nanoparticles can be fabricated using Leidenfrost drops w Video

first_img This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Journal information: Nature Communications French team demonstrates paramagnetic properties of liquid oxygen drops (Phys.org) —A team of researchers from several research institutions in Germany has found that certain types of nanoparticles can be created using levitated drops of heated water—Leidenfrost drops. In their paper published in the journal Nature Communications, the team describes how they created metal polymer hybrid foams and other nanoparticles using nothing more than water on a heated substrate. Play Gold nanoparticles synthesis in the Leidenfrost drop reactor: Transformation of Leidenfrost drop from yellow gold salts to plasmonic red colour of gold nanoparticles during the levitation. Credit: Nature Communications 4, Article number: 2400 doi:10.1038/ncomms3400 PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreen Play 3D synthesis and coating in the Leidenfrost drop: 3D coating of TEM grid. A rotary motion of Leidenfrost drop holds the TEM grid inside the drop during the coating. Credit: Nature Communications 4, Article number: 2400 doi:10.1038/ncomms3400 PausePlay% buffered00:0000:00UnmuteMuteDisable captionsEnable captionsSettingsCaptionsDisabledQuality0SpeedNormalCaptionsGo back to previous menuQualityGo back to previous menuSpeedGo back to previous menu0.5×0.75×Normal1.25×1.5×1.75×2×Exit fullscreenEnter fullscreencenter_img © 2013 Phys.org Plasmonic gold nanoparticles using a levitating drop reactor. Credit: Nature Communications 4, Article number: 2400 doi:10.1038/ncomms3400 Citation: Researchers discover nanoparticles can be fabricated using Leidenfrost drops (w/ Video) (2013, October 31) retrieved 18 August 2019 from https://phys.org/news/2013-10-nanoparticles-fabricated-leidenfrost-video.html Most everyone has seen Leidenfrost drops in action, they occur when dumping a small amount of water into an already heated pan—the drops that form slide around as if there is no friction due to the steam that builds up beneath them. In this new effort, the researchers noted that not only does water turn to steam in Leidenfrost drops but it appears that positive ions gather in that steam leaving negative ions to collect in the liquid above. If melted metal is added to the mix, its positive ions are attracted to the negative ions in the liquid where they react and solidify into certain types of nanoparticles.Using this technique the team found they were able to create nanoporous black gold as well as different types of nanoparticle based foams and also nanoparticle coatings that adhere to a three-dimensional substrate—all without using any toxic chemicals. Researchers have been searching for a way to create such materials in new ways that don’t result in toxic byproducts. Conventional methods rely on the use of a variety of toxic chemicals to cause the desired reactions to come about. That in turn leads to environmental problems as well as concern about the toxicity of the nanomaterials themselves. The process using Leidenfrost drops, on the other hand, is as clean as it gets, the researchers report, with no need for reducing agents—the reactions occur in the heated drops without any other mixing either—leading the researchers to describe the technique as “green chemistry.” The end result is a much cleaner way to make nanoparticles, which is good news as scientists have been discovering new uses for them in a large variety of products. The researchers believe the nanoparticles they have created thus far might one day be used in medical or electrical components. Explore further More information: Green chemistry and nanofabrication in a levitated Leidenfrost drop, Nature Communications 4, Article number: 2400 DOI: 10.1038/ncomms3400AbstractGreen nanotechnology focuses on the development of new and sustainable methods of creating nanoparticles, their localized assembly and integration into useful systems and devices in a cost-effective, simple and eco-friendly manner. Here we present our experimental findings on the use of the Leidenfrost drop as an overheated and charged green chemical reactor. Employing a droplet of aqueous solution on hot substrates, this method is capable of fabricating nanoparticles, creating nanoscale coatings on complex objects and designing porous metal in suspension and foam form, all in a levitated Leidenfrost drop. As examples of the potential applications of the Leidenfrost drop, fabrication of nanoporous black gold as a plasmonic wideband superabsorber, and synthesis of superhydrophilic and thermal resistive metal–polymer hybrid foams are demonstrated. We believe that the presented nanofabrication method may be a promising strategy towards the sustainable production of functional nanomaterials.last_img read more

Meet Vikram Seth the artist

Art is a natural extension of novelist-poet Vikram Seth’s literature. The writer says he likes to paint­­­— both in words and colours — to create organic shapes with distinct calligraphic identities and poetic sensibilities.The author of A Suitable Boy, who went public with his mastery over the intricate art of Chinese, Arabic and Devnagari calligraphy in his anthology of poetry, The Rivered Earth last year, unveiled three word paintings for Absolut Vodka’s creative art brand in the capital.The acrylic paintings with multi-dimensional surface textures in basic earth colours of orange, green, blue, gold and black, were conceived around the impressionist motifs of Absolut Vodka bottles framed by calligraphy for a new-media text-art effect. Below each canvas were etched two lines of Seth’s poetry to capture the essence of the visuals.‘I have studied Chinese calligraphy for 15 years from my master Zhao Yizhou. When I was in China [early in his career], I used to write calligraphy with a ball pen. That is how it happened,’ Seth recalled during the unveiling of his paintings.Green is the theme of Seth’s Pyasa Pyala [The Thirsty Cup] that takes off on Harivansh Rai Bachchan’s Madhushala in Devnagari calligraphy. ‘The canvas represents the shringar rasa [love],’ the writer said.The third canvas, Na Main, Na Mai in Urdu and Nastaleeq script, painted in a palette of blue and gold, is ‘shanta [peace] rasa’.‘In Blue and Gold, I watch the evening sky/Darken, till neither remains nor I,’ Seth says of the canvas in a rush of nostalgia. It was Arab Spring when Seth was painting the canvas and his teacher, Nasser Mansour in Jordan, had to vet the writer’s calligraphy before he decided to exhibit it, the author recalled.The writer shifted home to England after buying a country home, the old Rectory in Salisbury owned by maverick 17th century metaphysical poet George Herbert, in 2003.Currently the writer is waiting for A Suitable Girl [sequel to A Suitable Boy] to emerge ‘as and when she chooses to’. read more

The major DNS blunder at Microsoft Azure affects Office 365 One Drive

first_imgIt seems all is not well at Microsoft post yesterday’s outage as the Microsoft’s Azure cloud been up and down globally because of a DNS configuration issue. This outage that started at 1:20 pm yesterday, lasted for more than an hour which ended up affecting Microsoft’s cloud services, including Office 365, One Drive, Microsoft Teams, Xbox Live, and many others that are used by Microsoft’s commercial customers. Due to the networking connectivity errors in Microsoft Azure even the third-party apps and sites running on Microsoft’s cloud got affected. Meanwhile, around 2:30 pm, Microsoft started gradually recovering Azure regions one by one. Though Microsoft is yet to completely troubleshoot this major issue and has already warned that it might take some time to get everyone back up and running. But this isn’t the first time that DNS outage has affected Azure. This year in January, a few customers’ databases had gone missing, which affected a number of Azure SQL databases that utilize custom KeyVault keys for Transparent Data Encryption (TDE). The Azure status page reads, “Customers may experience intermittent connectivity issues with Azure and other Microsoft services (including M365, Dynamics, DevOps, etc).” The Microsoft engineers found out that an incorrect name server delegation issue affected DNS resolution, network connectivity, and that affected the compute, storage, app service, AAD, and SQL database resources. Even on the Microsoft 365 status page, Redmond’s techies have blamed an internal DNS configuration error for the downtime. Also, during the migration of the DNS system to Azure DNS, some domains for Microsoft services got incorrectly updated. The good thing is that no customer DNS records were impacted during this incident, also the availability of Azure DNS remained at 100% throughout this incident. Only records for Microsoft services got affected due to this issue. According to Microsoft, the broken systems have been fixed and the three-hour outage has come to an end and the Azure’s network infrastructure will soon get back to normal. Users have reported issues with accessing the cloud service and are complaining. A user commented on HackerNews, “The sev1 messages in my inbox currently begs to differ. there’s no issue maybe with the dns at this very moment but the platform is thoroughly fucked up.” Users are also questioning the reliability of Azure. Another comment reads, “Man… Azure seems to be an order of magnitude worse than AWS and GCP when it comes to reliability.” To know more about the status of the situation, check out Microsoft’s post. Read Next Microsoft brings PostgreSQL extension and SQL Notebooks functionality to Azure Data Studio Microsoft @MWC (Mobile World Congress) Day 1: HoloLens 2, Azure-powered Kinect camera and more! Microsoft Cloud services’ DNS outage results in deleting several Microsoft Azure database recordslast_img read more

Princess Cruises to offer its biggest Canada New England program ever in

first_imgTags: New England, Princess Cruises Posted by Share Princess Cruises to offer its biggest Canada & New England program ever in 2018 Travelweek Group center_img SANTA CLARITA, CALIF. — Princess Cruises’ 2018 Canada & New England cruise season will be the line’s largest deployment ever along the east coast, sailing onboard two of its newest ships – Regal Princess and Royal Princess.Both ships, carrying a maximum 3,560 guests, will sail for the first time together and depart from New York and Quebec to offer 10 cruise departures on four itineraries. These will visit 12 destinations in New England and Canada.“We’re excited to bring two of our newest ships to Canada & New England in 2018 so that more guests can enjoy the gorgeous fall foliage and famed destinations and landmarks in this region,” said Jan Swartz, Princess Cruises president.All 2018 Canada & New England voyages are open for sale on Dec. 1. Highlights include:· Royal Princess makes her maiden 10- to 11-day voyages out of Quebec and New York with overnight stays in Quebec on every voyage. These cruises visit Newport, Boston, Portland, Saint John, Halifax, Sydney, Charlottetown and Quebec, and include an overnight stay in Boston. Cruises depart Sept. 25, Oct. 5 and 16.More news:  CIE Tours launches first-ever River Cruise Collection· Royal Princess offers a 14-day ‘Canada & Colonial America’ cruise from Quebec to Ft. Lauderdale, departing on Oct. 26 and featuring calls in Port Saguenay, Sydney, Halifax, Saint John, Bar Harbor, Boston, Newport, New York and Norfolk.· Regal Princess sails on seven-day roundtrip cruises from New York, departing Sept. 22, 29, Oct. 6, 13 and 20. Stops include Newport, Boston, Bar Harbor, Saint John and Halifax.· Regal Princess also offers a five-day ‘Canadian Atlantic Provinces Getaway’ voyage out of New York, visiting Saint John and Halifax, and departing on Oct. 27.· Guests are offered a choice of two cruisetours on the East Coast, including ‘Historic America Cruisetour’, which includes highlights like Thomas Jefferson’s Monticello estate and Colonial Williamsburg, and ‘The Maple Explorer Cruisetour’ in Niagara Falls, Ottawa and Montreal, featuring highlights like the Canadian Museum of Civilization and the Rideau Canal.Princess Cruises loyal past guests are eligible for a special promotion when they book before August 31, 2017. Captain’s Circle members purchasing a Canada/New England cruise or cruisetour will receive a savings of $50 per person (does not apply to third and fourth berth guests).More news:  War of words between Transat, Group Mach ramps upAll fall 2018 Canada/New England guests sailing aboard Royal Princess or Regal Princess can book a new stateroom category featuring VIP amenities and exclusive dining with the new Club Class Mini-Suite. This elevated mini-suite category features select perks like Club Class Dining, priority embarkation and disembarkation, and complimentary wine.For more details go to princess.com. Friday, November 25, 2016 << Previous PostNext Post >>last_img read more