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Topic: Superhydrophobic material

In the News (Fri 25 Dec 09)

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	Surface modified porous expanded polytetrafluoroethylene and process for making - Patent 5437900
		The surface of the material is comprised of upper node surfaces 23 and fibrils 24 closest to the surface.
		The modified surface of the material is comprised of the freestanding node portions 25 and fibrils 24 closest to the surface.
		The foreground material in the lower portion of the photomicrograph is the cross sectional view while the material shown in the upper part of the photomicrograph is the surface of the material shown in perspective.
	www.freepatentsonline.com /5437900.html (7007 words)

	Nanotechnology and molecular technology PDA briefing - iQ NewsNet (Site not responding. Last check: 2007-10-10)
		The material consists of alternate layers of a conductor and an insulator.
		The material, consisting of an array of pairs of parallel gold nanorods, is relatively easy to fabricate, according to the researchers, and could lead to optical "superlenses" that reflect no light and operate with sub-wavelength resolution.
		Phononic crystals are made by embedding cylinders of one material in a different background medium, and the properties of the phononic band gap depend on the size and periodicity of the cylinders.
	www.iqnewsnet.com /displaysubl.asp?cat=N&year=2005 (13572 words)

	New Page 1 (Site not responding. Last check: 2007-10-10)
		The material is a solvent based formulation that repels water from whatever surface it is applied by providing a very high contact angle of 140-150 degrees.
		The chemical and physical properties of the material are such that drops of water are actually separated from the antenna surface by a visible layer of air.
		As surfaces become superhydrophobic with contact angles between 130 and 150 degrees, even heavy rain tends to run off as small drops.
	www.angelfire.com /vt2/vellox/new_page_1.htm (244 words)

	Science News Online: Table of Contents (Site not responding. Last check: 2007-10-10)
		Forests of carbon nanotubes coated with Teflon yield a superhydrophobic material—the ultimate self-cleaning surface.
		After 40 years of preparation, satellite Gravity Probe B is scheduled to launch next month and test the prediction that massive bodies, such as Earth, twist space itself as they rotate.
		A newfound material exhibits the desirable property of not expanding when heated over a wide temperature range, but from an apparent cause never seen before—electrons changing positions inside the new compound's crystal structure.
	www.sciencenews.org /articles/20031101/toc.asp (656 words)

	Science News: Carpet of carbon nanotubes cleans itself - Water Repellency Goes Nano (Site not responding. Last check: 2007-10-10)
		Because the spacing between nanotubes was less than a micron, the material could repel tiny droplets of water just a few micrometers in diameter.
		Materials such as these are called superhydrophobic because of their ability to repel water so completely.
		Researchers throughout the world have been striving to invent superhydrophobic materials for products such as antifouling paint, self-cleaning garments, or coatings on airplanes to prevent ice buildup.
	www.findarticles.com /p/articles/mi_m1200/is_18_164/ai_110737266 (552 words)

	Student Abstracts: ORNL - Materials Sciences
		As opposed to the many hydrophilic surfaces that are conducive to the flattening of water droplets, the ability of superhydrophobic materials to make water bead up lies partly in the trapped air pockets that result from the coarse surface structure.
		As more is learned about this material’s interaction with water and water based solutions, the more widespread the applications are expected to become such as for its use in drag reduction or for the purpose of water-proofing various surfaces like lenses and windshields.
		This material is an artificial single crystal that consists of alternating layers of 10 nm of pure chromium and 10 nm of Cr98V2 repeated 75 times.
	www.scied.science.doe.gov /scied/Abstracts2004/ORNLms.htm (5299 words)

	Method and apparatus for determining coagulation times - Patent 3963349
		Gentle agitation of the material in the reagent cup is achieved by oscillating the cup while the pipette tip of the transfer mechanism projects into the contents of that cup.
		While waxes, silicone, and other non-wetting materials might be suitable, it has been discovered that silane-treated fumed silica, available as Silanox from Cabot Corporation of Boston, Massachusetts is uniquely effective because of its superhydrophobicity, the uniformity of that hydrophobicity, the hardness of the coating, and the temperature stability of the coating layer.
		A pair of reels 39 and 40 are removably fitted upon the upper ends of shafts 37 and 38, respectively, and a disk-shaped shield 41 is interposed between the reels and the upstanding collar 36a of the liner or drip pan 36.
	www.freepatentsonline.com /3963349.html (5741 words)

	Current Materials, structures and surfaces news briefing - iQ NewsNet
		The researchers believe the material could have a wide range of applications in medicine and industry.
		The material, aluminium oxynitride, known commercially as ALON, could replace the existing bullet-proof glass on military vehicles, which is heavier and less tough.
		Superhydrophobic surface Dutch researchers have made superhydrophobic surfaces by using dual-size surface roughness, mimicking the roughness structure of the lotus leaf.
	www.iqnewsnet.com /latestissuel.asp?cat=M (1547 words)

	MPMN:Spotlight (June '99)
		Its vent membrane is superhydrophobic for reliable air elimination.
		Screens are available in materials such as titanium, stainless steel, nickel, copper, aluminum, brass, and nitinol.
		Material thicknesses range from 0.0005 to 0.090 in.
	www.devicelink.com /mpmn/archive/99/06/spot.html (1020 words)

	Science News: Materials repel water with simplicity, style - Waterproof Coats - new coatings, Japan, Turkey research (Site not responding. Last check: 2007-10-10)
		Using the brilliantly blue Morpho sulkowskyi butterfly as their model, Zhong-Ze Gu of the Kanagawa Academy of Science and Technology in Japan and his coworkers designed a synthetic superhydrophobic coating in a variety of bright colors.
		Gu's team made the material by permitting 6-nanometer-wide silica particles and several-hundred-micrometer-wide polystyrene spheres to assemble into a film.
		By varying the distance between air gaps, the team created materials in colors ranging from red to blue and versions with no apparent color.
	www.findarticles.com /p/articles/mi_m1200/is_9_163/ai_98695617 (606 words)

	CMSE Hot Articles
		For example, such materials may not obey the well-known reciprocity principle of optics: light will not trace back its original path if, after exiting from such a photonic crystal slab, it is sent back with a mirror (see figure).
		Thus, materials based on jarosites may be promising candidates for studies of the coupling between non-trivial spin textures and the transport of electrons in frustrated systems.
		The unique properties of these so-called superhydrophobic surfaces are a direct consequence of a complex surface texture that includes micron-scale hills and valleys that are decorated with nanoscale particles of hydrophobic material.
	web.mit.edu /cmse/www/cmsearticles.04.html (1418 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		is considered to be an ultrahydrophobic (or superhydrophobic) boundary.
		where r is a roughness factor, defined as the ratio of the actual area of a rough surface to the geometric projected area, and q is the thermodynamic contact angle on a smooth surface of the material.
		It is planned to consult with fiber and industrial textile producers to get their opinion on the requests in the area of ultrahydrophobic fibers and fabrics.
	mse.clemson.edu /htm/research/ntc/UltrahydrophobicFibers_1.htm (2023 words)

	Process of Making More Durable Coatings Gets 'Greener' (Site not responding. Last check: 2007-10-10)
		Genzer says the discovery, which was an "accident," allows for the physical and chemical surface properties of a flexible material to be tailor made.
		The trick is to increase the surface area of the material before the coating is applied.
		Stretching the substrate material allows you to fit more of the desired coating molecules onto its surface.
	www.earthvision.net /coldfusion/News_Page2.cfm?NewsID=13861 (299 words)

	Water repellency research (Site not responding. Last check: 2007-10-10)
		drop is to a spherical shape, ie the less it wets the material.
		hydrophobicity of the material and (b) the radius of the droplets,
		> hydrophobicity of the material and (b) the radius of the droplets,
	www.cyclingforums.com /showthread.php?p=2242268#post2242268 (978 words)

	"CAP & GOWN Textile-based Architectural Ecology
		Synthetics are generally non-woven fabrics, materials with fibers interlocked by heat, moisture, or by adhesives.
		Isolative and insulating material such as cellular silica aerogel, invented in 1931 by Samuel Stephens Kistler (1900-75), with apparent density of 0.003-0.35 g/cm³ could be impregnated with gaseous helium to form a delicate, low mass SHELL-LAND.AU roof that even passes filtered natural sunlight.
		The material composition of Asteroid 2002 AA29 is unknown; if the asteroid is spherical and consisted of solid iron, then it would tally ~4072275 tonnes.
	www.daviddarling.info /encyclopedia/C/CapandGown_Cathcart.html (12963 words)

	Engineering News at NC State
		This new material could be used in many beneficial applications ranging from tunable insulation coatings to medical implants.
		Cellophane tape was too sticky, so they began working with the chemical bonds of polymer materials to find a surface that would adhere just the right amount.
		While this work was going on, Genzer's lab moved to a different space and some forgotten MAM samples sat on the laboratory bench for six months.
	www.engr.ncsu.edu /news/news_articles/genzer.html (369 words)

	Heart Cut - November 21, 2005 (Site not responding. Last check: 2007-10-10)
		Aerogels are extraordinarily low-density materials, composed primarily of air and typically an inorganic material such as silica.
		These materials have applications as diverse as sensors, catalyst supports, insulation, and “space dust” collectors, but one of their shortcomings is high cost.
		The authors propose that the organic material encapsulates the clay, preventing structural migrations, and that the inorganic filler provides mechanical support in a mixed organic–inorganic co-continuous interpenetrating structure.
	www.acs.org /portal/a/c/s/1/acsdisplay.html?DOC=heartcut\index.html (1516 words)

	UCSB Chemical Engineering: Seminar Abstract
		Nature combines hard and soft materials often in hierarchical architectures to get synergistic, optimized properties and combinations of properties with proven, complex functionalities.
		Emulating such natural material designs in robust engineering materials using efficient processing approaches amenable to manufacturing represents a fundamental challenge to materials scientists and engineers.
		As a new direction in self-assembly, we have exploited mechanically-based re-assembly to create superhydrophobic, fractal silica surfaces mimicking those of the Lotus leaf and desert beetle.
	www.chemengr.ucsb.edu /~ceweb/seminars/abstracts/abstract15.html (355 words)

	Lotus effect shakes off dirt (November 2002) - News - nanotechweb.org
		But researchers at German chemical company BASF are developing a spray-on coating that mimics the way lotus leaves repel water droplets and particles of dirt.
		Lotus plants have superhydrophobic surfaces: water droplets falling onto them bead up and, if the surface slopes slightly, will roll off.
		Dubbed lotus stone, the material has potential for use in the construction industry, in applications such as facing tiles.
	nanotechweb.org /articles/news/1/11/5/1 (388 words)

	Waterproof Coats: Materials repel water with simplicity, style: Science News Online, March 1, 2003 (Site not responding. Last check: 2007-10-10)
		Water beads atop a new hydrophobic material (above) modeled after the wings of the Morpho sulkowskyi butterfly (below).
		Cold Spring, N.Y. I have a question regarding the properties of this superhydrophobic film.
		Washington, D.C. According to the researchers, superhydrophobic coatings could potentially prevent icing on aircraft wings.
	www.sciencenews.org /articles/20030301/fob4.asp (744 words)

	Chemical & Engineering News: Science & Technology - Nanoparticle Coating Keeps Glass Fog-free
		Michael F. Rubner and Robert E. Cohen may have just robbed Hollywood horror filmmakers of one of their most beloved clichés--the threatening note furtively traced in the fog of a bathroom mirror.
		That's because the MIT professors, in the departments of materials science and of chemical engineering, respectively, have developed a new superhydrophilic polymer coating that permanently eliminates fog from bathroom mirrors as well as windshields, eyeglasses, and camera lenses.
		The antifogging material grew out of an effort to mimic the superhydrophobic properties of lotus leaves (CandEN, June 7, 2004, page 30).
	pubs.acs.org /cen/nanofocus/top/83/8338sci1a.html (503 words)

	BIOASTRO Mailing List: SETI bioastro: Fw: Science News e-LETTER
		Forests of carbon nanotubes coated with Teflon yield a superhydrophobic material--the ultimate self-cleaning surface.
		As researchers muse about the evolutionary origins of friendship, even the social interactions of giraffes are getting a second look.
		A newfound material exhibits the desirable property of not expanding when heated over a wide temperature range, but from an apparent cause never seen before--electrons changing positions inside the new compound's crystal structure.
	seti.sentry.net /archive/bioastro/2003/Nov/0003.html (919 words)

	Fluorine-carbon and Fluoride-carbon Materials; Hardback; Book
		Presents scientific findings concerning the synthesis, structure, thermodynamics and physical and chemical properties of fluorine- and fluoride-carbon compounds, elucidating their applications in lithium batteries, superhydrophobic composites, and the electrolytic production of elemental fluorine.
		This material may be freely distributed ONLY with full reference to Open Communications Inc,
		This material is an invitation to treat and not an offer.
	www.netstoreusa.com /tabooks/082/0824792866.shtml (160 words)

	Home Page
		At the nano scale the disciplines of chemistry, physics and biology merge as scientists learn about the fundamental properties of material at this tiny scale.
		So liquids like the drop of water on the right are repelled by the nanotextured material.
		-- Nanotechnology is a technical discipline that uses a combination of chemistry, physics and industrial engineering to discover and use the special characteristics of materials at the nanometer or atomic scale.
	www.mphasetech.com (825 words)

	Superhydrophobic states
		It is well known that the roughness of a hydrophobic solid enhances its hydrophobicity
		However, it is shown here that both situations are very different from their adhesive properties, because Wenzel drops are found to be highly pinned.
		In addition, irreversible transitions can be induced between Cassie and Wenzel states, with a loss of the anti-adhesive properties generally associated with superhydrophobicity.
	nature.com /nmat/journal/v2/n7/abs/nmat924.html;jsessionid=D1504EC0A... (188 words)

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	www.medscape.com /medline/abstract/16190684 (112 words)

	Center for Micro-Engineered Materials @ UNM
		Dmitri A. Brevnov, Marcos Barela, Menake E. Piyasena, Gabriel P. López, Plamen B. Atanassov, "Patterning of nanoporous anodic aluminum oxide arrays by using sol-gel processing, photolithography and plasma etching", Chemistry of Materials, 2004, 16(4), 682-687.
		and Al Nanoparticles: Pathway to Enhanced Thermite Materials,” accepted for publication in Powder Technology (2004).
		Films on Polyethylene Particles,” Chemistry of Materials, 16 (26), 5602-5609 (2004).
	www.unm.edu /~cmem/publications.htm (1731 words)

	Materials : Solgel
		Superhydrophobic antireflective silica films: fractal surfaces and laser-induced damage thresholds
		Shrinkage Control in a Photopolymerizable Hybrid Solgel Material for Holographic Recording
		Stable Doped Hybrid Sol-Gel Materials for Solid-State Dye Laser
	ao.osa.org /ocisdirectory/160_6060.cfm (297 words)

	Transformation of a Simple Plastic into a Superhydrophobic Surface -- Erbil et al. 299 (5611): 1377 Data Supplement - ...
		Transformation of a Simple Plastic into a Superhydrophobic Surface -- Erbil et al.
		299 (5611): 1377 Data Supplement - Supporting Online Material -- Science
		Jump to: Page Content, Section Navigation, Site Navigation, Site Search, Account Information, or Site Tools.
	www.sciencemag.org /cgi/content/full/299/5611/1377/DC1 (154 words)

	DELFS 2004 \| Program
		Functional Consequences of Phase Separation and Material Heterogeneity in Biological Membranes
		Symposium: Inhomogeneities and Heterogeneities in Cuprates and Related Materials
		Symposium: Inhomogeneities and Heterogeneities in Cuprates and Related Materials (continued)
	www.lanl.gov /orgs/mst/delfs2004/program.shtml (1386 words)

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