Navigation Links
Penn researchers grow liquid crystal 'flowers' that can be used as lenses
Date:12/20/2013

g changes in the patterns of defects on the surface of the liquid crystal resting on top of them. In another experiment, they showed they could make a "hula hoop" of defects around individual posts, which would then act as a second template for a ring of defects at the surface.

In their latest work, the researchers used a much simpler cue.

"Before we were growing these liquid crystals on something like a trellis, a template with precisely ordered features," Kamien said. "Here, we're just planting a seed."

The seed, in this case, were silica beads essentially, polished grains of sand. Planted at the top of a pool of liquid crystal flower-like patterns of defects grow around each bead.

The key difference between the template in this experiment and ones in the research team's earlier work was the shape of the interface between the template and the liquid crystal.

In their experiment that generated grid patterns of defects, those patterns stemmed from cues generated by the templates' microposts. Domains of elastic energy originated on the flat tops and edges of these posts and travelled up the liquid crystal's layers, culminating in defects. Using a bead instead of a post, as the researchers did in their latest experiment, makes it so that the interface is no longer flat.

"Not only is the interface at an angle, it's an angle that keeps changing," Kamien said. "The way the liquid crystal responds to that is that it makes these petal-like shapes at smaller and smaller sizes, trying to match the angle of the bead until everything is flat."

Surface tension on the bead also makes it so these petals are arranged in a tiered, convex fashion. And because the liquid crystal can interact with light, the entire assembly can function as a lens, focusing light to a point underneath the bead.

"It's like an insect's compound eye, or the mirrors on the biggest telescopes," said Kamien. "As we lear
'/>"/>

Contact: Evan Lerner
elerner@upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Study by UC Santa Barbara researchers suggests that bacteria communicate by touch
2. UC Santa Barbara researchers discover genetic link between visual pathways of hydras and humans
3. Researchers attempt to solve problems of antibiotic resistance and bee deaths in one
4. UNH researchers find African farmers need better climate change data to improve farming practices
5. Ottawa researchers to lead world-first clinical trial of stem cell therapy for septic shock
6. Researchers uncover molecular pathway through which common yeast becomes fungal pathogen
7. Researchers print live cells with a standard inkjet printer
8. Columbia Engineering and Penn researchers increase speed of single-molecule measurements
9. Researchers reveal how a single gene mutation leads to uncontrolled obesity
10. Researchers discover novel therapy for Crohns disease
11. New paper by Notre Dame researchers describes method for cleaning up nuclear waste
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Penn researchers grow liquid crystal 'flowers' that can be used as lenses
(Date:8/20/2014)... rugs and plastic bags could one day be made ... petroleum, scientists are now reporting. The novel process they ... deal with its agricultural and plastic waste problems, appear ... Athanassiou, Ilker S. Bayer and colleagues at the Italian ... constantly growing. In 2012, its production reached 288 million ...
(Date:8/20/2014)... for electronically manipulating the flight muscles of moths and ... those muscles. The work opens the door to the ... emergency response. , "In the big picture, we want ... moths for use in applications such as search and ... of electrical and computer engineering at NC State and ...
(Date:8/19/2014)... decrease China,s increasing caesarean section rate, suggests a new ... International Journal of Obstetrics and Gynaecology (BJOG) . , ... in the world. Of 16 million babies born in ... rate is not known, the current Chinese language literature ... ranging from 36% to 58%. However, before the 1980s, ...
Breaking Biology News(10 mins):Research paves way for development of cyborg moth 'biobots' 2Is China's 50 percent cesarean section delivery rate too high? 2Is China's 50 percent cesarean section delivery rate too high? 3
... A multi-disciplinary 5-year project at the University of ... has received $10 million in funding from the National ... and eventually manipulate the communication between cells that causes ... the School of Medicine, the College of Science and ...
... article in the Journal of Integrated Pest Management ... and present management practices, and current research being conducted. ... an introduced insect pest of small grains first recorded in ... from Europe or Asia into Michigan, cereal leaf beetle has ...
... REDWOOD CITY, Calif., Oct. 17, 2011 ... will address critical issues surrounding the use of biometrics for ... market update on October 19, 2011 at 11:05 a.m. GMT, ... On October 20, 2011 at 11:15 a.m. GMT, Bjorn will ...
Cached Biology News:$10 million grant supports biological sciences team at University of Nevada, Reno 2$10 million grant supports biological sciences team at University of Nevada, Reno 3DigitalPersona Co-Founder and CTO to Tackle Critical Issue of Civil ID Security at Biometrics 2011 2
(Date:8/20/2014)... often have it that American Indians largely were wiped ... influenza and tuberculosis brought to the New World by ... 20 million people lived in the Americas shortly before ... killed by European diseases., But new research led by ... Johannes Krause of the University of Tubingen in Germany ...
(Date:8/20/2014)... Aug. 20, 2014  PAREXEL International Corporation (NASDAQ: ... presenting at the Baird Healthcare Conference in New York.  ... Financial Officer, will be making a presentation on PAREXEL ... Wednesday, Sept. 3, 2014. A live webcast ... section of PAREXEL,s website at www.PAREXEL.com in ...
(Date:8/20/2014)... 20, 2014 WriteResult®, a leading provider ... it has expanded its myPROpad™ ePRO tablet with the ... one of the most widely used and well-respected Patient ... status. The EQ-5D is used during clinical trials and ... that can be used to demonstrate Health-Related Quality of ...
(Date:8/19/2014)... , Aug. 19, 2014 A Geisinger researcher ... nominated for a Centers for Disease Control and Prevention ... major public health concern. Joseph Boscarino ... one of a team of researchers nominated for the ... Shepard Science Award for Data Methods and Study Design. ...
Breaking Biology Technology:Unusual discovery leads to fascinating tuberculosis theory 2Unusual discovery leads to fascinating tuberculosis theory 3PAREXEL International To Present At Baird Healthcare Conference 2EQ-5D™ Assessment Now Available for iPad 2Geisinger investigator nominated for federal award 2Geisinger investigator nominated for federal award 3
... Nanotechnologies (PEN) has developed findNano, an application for ... discover and determine whether consumer products are nanotechnology-enabled. ... engineering them at an incredibly small scale, has ... delivery systems. findNano allows users ...
... , CORAL GABLES, Fla., Nov. 13 Catalyst Pharmaceutical ... Nasdaq Staff Deficiency Letter dated November 13, 2009 indicating that ... Price requirement set forth in Nasdaq Listing Rule 5550(a)(2) for ... Nasdaq Listing Rules (the "Rules") require listed securities to maintain ...
... TAI,AN CITY, China, Nov. 13 /PRNewswire-Asia-FirstCall/ -- China ... the "Company"),one of the leading plasma-based pharmaceutical companies in ... call at 8:00 a.m. ET on,Monday, November 16, 2009, ... September 30, 2009. , Hosting ...
Cached Biology Technology:findNano app puts nanotech in your pocket 2Catalyst Receives Guidance from Nasdaq Regarding Minimum Bid Price Requirement 2China Biologic Schedules Conference Call to Discuss Third Quarter 2009 Financial Results 2
Human peripheral blood eosinophils, For immunohistochemistry (IHC) Cell Chip with Human Peripheral Blood Granulocytes...
Monocyte-derived dendritic cells, For immunohistochemistry (IHC) Cell Chip with Human Umbilical Cord Blood Dendritic Cells...
Umbilical cord blood CD14+ Monocytes, For immunohistochemistry (IHC) Cell Chip with Human Umbilical Cord Blood Monocytes, B Cells and NK Cells...
Umbilical cord blood CD19+ B cells, For immunohistochemistry (IHC) Cell Chip with Human Umbilical Cord Blood Monocytes, B Cells and NK Cells...
Biology Products: