Navigation Links
Killer pulses help characterize special surfaces
Date:9/23/2008

ric field enhancement is really big, it takes only a weak pulse to kill it," Dlott said. "If the molecule is in a very cold spot, then it takes a really big laser pulse to kill it."

Dlott, Fang and Seong demonstrated their technique by measuring the distribution of local enhancements for benzenethiolate molecules on a substrate of silver-coated nanospheres 330 nanometers in diameter.

To characterize the surface, the researchers first measured the initial Raman intensity. Then they put in a weak killer pulse, which destroyed the molecules in the hottest spots. After measuring the new Raman intensity, they put in a bigger pulse and destroyed the molecules in slightly colder spots. The researchers continued with bigger and bigger pulses until all the benzenethiolate molecules were destroyed.

"We found the hottest spots comprised just 63 molecules per million, but contributed 24 percent of the overall Raman intensity," Dlott said. "We also found the coldest spots contained 61 percent of the molecules, but contributed only 4 percent of the overall intensity."

Measurements like these, of the distribution of local site enhancements, will help researchers design better scattering surfaces for sensor applications.

Prior to this work, no one knew if the Raman intensity was dominated by a small number of hot molecules or a large number of cold ones. Dlott, Fang and Seong have answered that important scientific question; not just with a yes or no, but with a full determination of exactly how many molecules there are in each level of hot or cold.

"Now, when evaluating a new surface-enhanced Raman material, instead of knowing just the average intensity, we know the highest, the lowest, and everything in between," Dlott said.


'/>"/>

Contact: James E. Kloeppel
kloeppel@illinois.edu
217-244-1073
University of Illinois at Urbana-Champaign
Source:Eurekalert

Page: 1 2

Related biology technology :

1. Panel to Discuss the Far-Ranging Effects and Consequences of Heart Disease, Which is the Leading Killer in Both Men and Women in the United States
2. Experts and Representatives From Leading International Health-Care Organizations Call to Stop the Hypertension Pandemic, a Worldwide Silent Killer
3. New technique measures ultrashort laser pulses at focus
4. FDA Approves EOVIST(R) to Detect and Characterize Focal Liver Lesions
5. SportCoatings; The North American Booster Club Association (NABCA); the Coatings Specialist Group New Booster Program Goes High Tech With Invisible Antimicrobial Defense
6. ev3 and FoxHollow Announce Date for Special Meeting of FoxHollow Stockholders to Vote on Proposed Merger
7. Specialists Are Turning to Biologics Earlier in the Treatment of Psoriasis and Psoriatic Arthritis
8. Patient Treatment for Bipolar Disorder Varies Depending on Doctor Specialty; Well Designed Clinical Trials May Be The Answer
9. Ranbaxy to Consolidate Position in Biopharmaceuticals and Speciality Injectables Including Oncology
10. ZymoGenetics and Merck Serono Receive FDA Special Protocol Assessment for Atacicept Pivotal Study in Lupus Nephritis
11. The Parkinsons Disease Foundation Commemorates its 50th Anniversary with Special Scientific Symposium on Parkinsons Disease
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/25/2015)... MN (PRWEB) March 26, 2015 Agnition ... upcoming episode of American Farmer, airing for the first ... The segment of American Farmer will explore the extremely ... provides crop producers with a patented Microbial Catalystâ„¢ technology ... and greater yields. The segment will air again on ...
(Date:3/25/2015)... The surging prevalence of internet ... social media growth, with over 50% of the ... networking. Insurance companies are making use of social ... promote a diversity of their services and products. ... social networking services as part of sales and ...
(Date:3/25/2015)... , March 25, 2015 Accelovance, a therapeutically ... finalist for "Best Contract Research Organization" at the upcoming ... Vaccine Congress. This is the eighth ... for the award, winning for "Best Contract Research Organization" ... Recommended" distinction in 2013. "We,re excited to ...
(Date:3/25/2015)... Fla. , March 25, 2015  Point-of-Care ... and management consulting firm, has launched the ePrescribing ... to simplify tracking of ePrescribing regulatory requirements in ... "The ePrescribing regulatory landscape continues to change rapidly, ... deliver what the industry, and ultimately patients, need," ...
Breaking Biology Technology:Agnition to be Featured In Upcoming Episode of American Farmer on RFD-TV 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 3Accelovance Nominated for 2015 Vaccine Industry Excellence (ViE) Awards 2Point-of-Care Partners Launches the ePrescribing State Law Capsule 2
... 3 Verenium Corporation (Nasdaq: VRNM ... specialty enzymes and next-generation cellulosic ethanol, today announced ... facility in Jennings, Louisiana, and the recent announcement ... is now consolidating its research and development (R&D) ...
... April 2 Amylin Pharmaceuticals, Inc. (Nasdaq: ... Lead Independent Director, James N. Wilson, providing shareholders with ... Independent Director of Amylin, I am writing you today ... your company, as well as details on the slate ...
... SPO Medical Inc. (OTC: SPOM),a leading developer of ... announced today that it has filed its Annual,Report on ... , Gross revenues of US$2.8 ... sales of SPO Medical,s finger oximeter PulseOx 6000(TM) and,the ...
Cached Biology Technology:Verenium Announces Organizational Changes 2Verenium Announces Organizational Changes 3Amylin Pharmaceuticals Provides Shareholders with Update Regarding Recent Developments 2Amylin Pharmaceuticals Provides Shareholders with Update Regarding Recent Developments 3Amylin Pharmaceuticals Provides Shareholders with Update Regarding Recent Developments 4Amylin Pharmaceuticals Provides Shareholders with Update Regarding Recent Developments 5Amylin Pharmaceuticals Provides Shareholders with Update Regarding Recent Developments 6Amylin Pharmaceuticals Provides Shareholders with Update Regarding Recent Developments 7Amylin Pharmaceuticals Provides Shareholders with Update Regarding Recent Developments 8SPO Medical Files Annual Report for Fiscal 2008 2SPO Medical Files Annual Report for Fiscal 2008 3
(Date:3/10/2015)... 10, 2015   Tute Genomics , pioneer in ... by next-generation sequencing company PrimBio Research Institute ... targeted gene panel interpretation. PrimBio, a certified ... most current technologies to support the work of experts ... offers two types of exome sequencing services: 1) Targeted ...
(Date:3/5/2015)... , March 5, 2015 In Brazil ... of companies already using these solutions and 42 percent planning ... the latter, approximately 25 percent of the companies will be ... While the majority of companies in the region are currently ... the hybrid model will command significant attention in the coming ...
(Date:3/3/2015)... , March 3, 2015 ... provider of advanced cryogenic logistics solutions for ... immunotherapies, stem cells, cell lines, clinical research ... medicine, today announced the expansion of its ... Centers, ("Fred Hutch") Clinical Research Division ...
Breaking Biology News(10 mins):PrimBio Research Selects Tute as Whole Exome Analysis Provider, Creating Integrated, End-to-End Solution for Next-Generation Sequencing & Data Analysis 2PrimBio Research Selects Tute as Whole Exome Analysis Provider, Creating Integrated, End-to-End Solution for Next-Generation Sequencing & Data Analysis 3Two of Every Three Brazilian Companies will have Invested in Cloud by 2015, Finds Frost & Sullivan 2Two of Every Three Brazilian Companies will have Invested in Cloud by 2015, Finds Frost & Sullivan 3Two of Every Three Brazilian Companies will have Invested in Cloud by 2015, Finds Frost & Sullivan 4Cryoport, Inc. Expands Support of Fred Hutchinson Cancer Research Center's Clinical Research Division 2Cryoport, Inc. Expands Support of Fred Hutchinson Cancer Research Center's Clinical Research Division 3
... 3-D glasses in the ultrasound lab to see their developing ... the IMAX movies," according to researchers at Duke University's Pratt ... developed real-time, three-dimensional ultrasound imaging says it has now modified ... more realistic perception of depth. Paired images seem to pop ...
... A New York University College of Dentistry (NYUCD) research team ... of modern Homo sapiens out of Africa to Asia. ... of cariology and comprehensive care at NYUCD, discovered that Streptoccocus ... with its human hosts in a clear line that can ...
... and large scale culture of stem cells for potential ... In an upcoming PLoS ONE paper, researchers, including Andras ... of experimental observations and computer simulations, that the stem ... cellular microenvironment. , These observations are in line ...
Cached Biology News:Ultrasound upgrade produces images that work like 3-D movies 2'Ancestral eve' was mother of all tooth decay 2
... This kit is designed for easy ... The protocol allows for successful transformation simply ... kit reagents with cultured yeast cells. No ... washing, are required. The kit is particularly ...
... II Microplate Handler is a high-capacity, ... integrating BioTeks washers, readers and liquid ... capacity, ultimate flexibility and intuitive and ... capacity to single devices or linking ...
... easier. It offers a wide array of features for ... *Instruments supported: Control ... PR, SR, PG-S, PG, SG, AT, MT, UMT, AB-S, ... User guidance on the balance display ...
XPLAC (S-17)...
Biology Products: