Featured Research

from universities, journals, and other organizations

The hidden threat posed by inconspicuous stripes

Date:
October 22, 2012
Source:
Springer Science+Business Media
Summary:
Patterns fascinate. Particularly stripes. Found in nature in zebras, they are also found in the most unlikely places, such as powdered drugs' mixing vessel walls. In a new article, physicists propose a traffic model to predict the formation of different patterns, ranging from stripes to spots.

Patterns fascinate. Particularly stripes. Found in nature in zebras, they are also found in the most unlikely places, such as powdered drugs' mixing vessel walls. In an article about to be published in EPJ E, Nirmal Thyagu and his colleagues from Rutgers University, New Jersey, USA, propose a traffic model to predict the formation of different patterns, ranging from stripes to spots.

Thanks to simulations, Thyagu and colleagues showed the underlying stripe formation mechanism, which they propose stems from traffic-like jams, whereby particles move more slowly when surrounded by other particles. This numerical model revealed three distinct patterns of how "sticking" can occur. These include stripe formation, clearing of surfaces between stripes, sharpening lead edges of the stripes, and stripe-to-spot transitions. These results were subsequently confirmed through experiments.

What is more, the authors found, striped patterns invariably form, provided that the relative humidity is in a range between 40 and 60%, and the tumbler surface is sufficiently rough enough to give hold to an initial layer.

Striped patterns formed by particles limit micro-patterned circuit size in electronics, inhaled medicines' effectiveness and polymer manufacturing efficiency. These patterns also adversely affect pharmaceutical manufacturing, as stripes appear on the walls of mixing vessels used for the production of powdered drugs.

More specifically, the authors also showed that active pharmaceutical ingredients can preferentially stick to mixing vessels' walls, and can carry as much as twice the concentration of active ingredients. As a result, the bulk powder used for tablets is less concentrated than it should be, or can be too concentrated if the highly concentrated material falls back into the bulk. Research focusing on how the effect carries over when scaling up to pilot- and full-scale manufacturing is currently underway.


Story Source:

The above story is based on materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. N. Nirmal Thyagu, A. Vasilenko, A. Voyiadjis, B. J. Glasser, T. Shinbrot. Stuck in traffic: Patterns of powder adhesion. The European Physical Journal E, 2012; 35 (10) DOI: 10.1140/epje/i2012-12105-y

Cite This Page:

Springer Science+Business Media. "The hidden threat posed by inconspicuous stripes." ScienceDaily. ScienceDaily, 22 October 2012. <www.sciencedaily.com/releases/2012/10/121022080410.htm>.
Springer Science+Business Media. (2012, October 22). The hidden threat posed by inconspicuous stripes. ScienceDaily. Retrieved October 22, 2014 from www.sciencedaily.com/releases/2012/10/121022080410.htm
Springer Science+Business Media. "The hidden threat posed by inconspicuous stripes." ScienceDaily. www.sciencedaily.com/releases/2012/10/121022080410.htm (accessed October 22, 2014).

Share This



More Computers & Math News

Wednesday, October 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Thanks, Marty McFly! Hoverboards Could Be Coming In 2015

Thanks, Marty McFly! Hoverboards Could Be Coming In 2015

Newsy (Oct. 21, 2014) If you've ever watched "Back to the Future Part II" and wanted to get your hands on a hoverboard, well, you might soon be in luck. Video provided by Newsy
Powered by NewsLook.com
Robots to Fly Planes Where Humans Can't

Robots to Fly Planes Where Humans Can't

Reuters - Innovations Video Online (Oct. 21, 2014) Researchers in South Korea are developing a robotic pilot that could potentially replace humans in the cockpit. Unlike drones and autopilot programs which are configured for specific aircraft, the robots' humanoid design will allow it to fly any type of plane with no additional sensors. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
Japanese Scientists Unveil Floating 3D Projection

Japanese Scientists Unveil Floating 3D Projection

Reuters - Innovations Video Online (Oct. 20, 2014) Scientists in Tokyo have demonstrated what they say is the world's first 3D projection that floats in mid air. A laser that fires a pulse up to a thousand times a second superheats molecules in the air, creating a spark which can be guided to certain points in the air to shape what the human eye perceives as an image. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Apple Enters Mobile Payment Business

Apple Enters Mobile Payment Business

AP (Oct. 20, 2014) Apple is making a strategic bet with the launch of Apple Pay, the mobile pay service aimed at turning your iPhone into your wallet. (Oct. 20) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins