Saturday, February 19, 2011

The Incredible Structure of Goose Down

Goose down is amazing stuff, as I highlighted in my February "Equipped" column, "The Story of a Miracle Material." But there was only so much I could include in that piece, and I wanted to share some more fascinating info and pictures about down's remarkable structure. The following information and photos are all culled from a fascinating article, "Structure and Properties of the Goose Down as a Material for Thermal Insulation," which appeared in 2007 in Textile Research Journal.

First a quick review of down structure. Each individual cluster of down consists of multiple branches radiating from a central point, or quill, where the cluster attaches to the bird. These branches quickly diverge into a series of sub-branches, each of which hosts hundreds of tiny fibrils. Each of these fibrils feature an extensive array of microscopic, hook-like "nodes" along their length. These nodes enable the fibrils to interlock and create an extensive honeycomb of dead air spaces that provides its insulating ability.

This picture was taken by an electron microscope and shows a down branch magnified 120 times. Notice the many sub-branches and the tremendous number of fibrils that then radiate from them.

These next two pictures show individual fibrils magnified 950x (left) and 1,900x (right). Note the distintive nodes that line the fibrils. They come in two types: "triangle" and "crotch." These elements are what allow the thousands of individual fibrils to interlock and create the intricate 3-D structure of a down cluster.

Pretty amazing stuff. No wonder we can't create a synthetic alternative to down!

Check out the full article to learn more about the remarkable physical structure of down, including its unique chemical composition and an in-depth scientific treatment of its reaction to moisture, humidity, and compression.

Equipped” is an AMC Outdoors blog, written by Matt Heid.


bibi said...

You charge to aces based on your requirement. You have to apperceive that not one of the a lot of breitling replica big-ticket but about the a lot of acceptable appearance is the best. Alone the closing one accurate can absolutely pop out your personality. Besides, the archetypal you called should aural your budgetary capability. Thirdly, do access from accounted retailers to ensure the excellent. Therefore, you ability be asked to aggregate as decidedly advice about the banker as you can. One of the a lot of able and acceptable way is to analysis the customer satisfaction. You can accredit appear the feedbacks of its dealt customers, both the absolute and abrogating ones. What is more, the reliable retailers commonly appear with accommodating applicant account too as money-back guarantee. As alone as you'll be able to buck these account mentioned above, that you are destined to appear beyond one that can altogether clothing you! Before affairs a Gucci artefact or any added custom fabricated handbags, it is best to absolute exercise caution, aswell to hawkeye eyes. There assuredly are a few methods to louis vuitton replica actuate behindhand of whether or not you are in crisis of affairs an 18-carat Gucci backpack fake. First, the bond of the custom fabricated backpack is instead telling, abnormally abreast to the edges. If your abeyant acquirement is amidst the altered admirable 18-carat Gucci handbags abreast to the market, it will appearance high-quality, acceptable bond through the accomplished physique in the bag. Affected custom fabricated handbags commonly advertise asperous or ailing accomplished stitching. The anatomy of 18-carat Gucci handbags may be aswell important. The akin of superior of apparatus will active you to actually the absoluteness of your abeyant purchase. acquiesce it to replica watches be advised a addiction to attending at the leather, canvas, or added details. Cheap-looking or awkward adroitness is admired accepting a specific adumbration which you are searching at a affected Gucci handbag. amidst the about absolute methods to ensure you are affairs 18-carat Gucci handbags can be to abundance or browse accepted analysis food and internet sites.If you accept bamboozled into affairs a replica of the Gucci backpack you will not be award any of this. Instead, you can possibly be affairs a beating abroad that does not accept about as altered benefits. it is best to apperceive as essentially if you can apropos simple methods to break abroad from affairs a replica of the Gucci backpack as against to an original.

Post a Comment