Navigation Links
New Constant Diameter NeedleProbes™ with Unique Ability to Measure Liquid Surface Properties by AFM
Date:12/15/2009

Constant diameter NeedleProbes™ for Atomic Force Microscopy (AFM) have been developed and are opening up a new area of research for studies at the liquid/air interface. The NeedleProbes’ cylindrical geometry enables researchers to measure surface tension, contact angle, meniscus height, evaporation rate and viscosity - all in a single force distance curve.

(PRWEB) December 15, 2009 -- New, constant diameter NeedleProbes are enabling unique measurements at the liquid/air interface. These NeedleProbes’ cylindrical geometry enables a new area of research for liquid studies. “AFM can now be used to measure surface tension, contact angle, meniscus height, evaporation rate and viscosity - all in a single force distance curve” says Mehdi Yazdanpanah, inventor of the NeedleProbes. The new metallic probes have recently been introduced for a variety of applications, many of which had been impractical for AFM.

Atomic force microscopy routinely takes advantage of force-distance curves to measure interactions between an AFM tip and a sample surface. An example would be extending the tip to a liquid surface so the wetting force can be measured. Although standard probes can detect wetting force, surface tension and contact angle are very complicated to determine. Imprecise knowledge of the length of contact and angle of the meniscus with the sides of the tip make such measurements impractical using standard AFM probes. Furthermore, with increasing insertion depth, the attractive force of standard tips continues to grow as the contact line increases. The large force can eventually overcome the cantilever and result in the unintended immersion of the cantilever into the liquid.

The NeedleProbes’ differentiating feature is the cylindrical shape, in contrast to the pyramidal or conical shape of most standard AFM probes. With the NeedleProbes, the liquid’s attractive force is constant as the tip is immersed. When a NeedleProbe has a second region with a larger diameter, there is a step change in force when this larger region enters the liquid. The figure shows a diagram that differentiates between a conventional probe and a NeedleProbe entering a liquid medium.

The surface tensions for several low molecular weight liquids were measured with the NeedleProbes. Results were between -4.2 % and +8.3 % of standard reported values. Also, the F-D curves showed well-defined stair-step events on insertion and retraction from partial wetting liquids, compared to conventional AFM probes. A NeedleProbe with a step change in diameter at a known distance from its end produced two steps in the F-D curve from which the meniscus height was determined. The step features enable meniscus height to be determined from distance between the steps, as an alternative to calculating the height corresponding to the AFM measured values of surface tension and contact angle.

About Nanoscience Instruments:
Nanoscience Instruments, Inc. provides hundreds of products and services for nanoscience and supports research and engineering at universities, government laboratories, and industrial R&D facilities around the world. Product offerings include atomic force microscopes, 3D optical profilometers, and accessories for these and other high resolution microscopy techniques. Nanoscience offers a broad line of consumable items that includes AFM probes, chemicals for surface modification, STM supplies and teaching materials & samples. More information can be found at nanoscience.com.

About NaugaNeedles:
NaugaNeedles, LLC is a startup that develops and manufactures innovative scanning probe microscopy sensors. Current products include high performance, durable and customizable needle tips and cantilevers. NaugaNeedles' products are used as unique nano-force and nano-bio sensors that enable new research and discovery in research, industrial, and life sciences.

###

Read the full story at http://www.prweb.com/releases/2009/12/prweb3341404.htm.


'/>"/>
Source: PRWeb
Copyright©2009 Vocus, Inc.
All rights reserved  

Related biology technology :

1. No small measure: Origins of nanorod diameter discovered
2. Angiotech Expands Quill(TM) SRS product offering receiving FDA 510(k) approval for smaller size diameters of Quill(TM) SRS PDO
3. Angiotech announces additional diameters of sutures to further expand its Quill(TM) SRS PDO product line
4. AvidBiotics Corp. Granted Key U.S. and European Patents on Unique Protein Modification Platform
5. NYU-Poly Launches Unique Undergrad Forum on Invention, Innovation and Entrepreneurship
6. Enerkem Announces Unique Community Energy Project
7. Enox Biopharma Will Present Its Unique Self-Sterilizing Urinary Catheter at the 49th Annual ICAAC Meeting.
8. New Sigma Advanced Genetic Engineering Labs Offers Research Community Unique Rodent Models Developed Using Exclusive Gene-Editing Technology
9. University of Lodz Invests in the Unique Cellaxess(R)HT System for Research on Multidrug Resistance Genes in Cancer
10. DNA2.0 Awarded US Patents for Breakthrough Gene Optimization Technology -- Company's Unique Algorithm Enables Expression Yields up to 50 Times Greater than Competing Approaches
11. Chicago-Area Pediatricians Offering Unique Test to Detect Vision Problems in Children as Young as Six Months of Age
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New Constant Diameter NeedleProbes™ with Unique Ability to Measure Liquid Surface Properties by AFM
(Date:10/12/2017)... New York, NY (PRWEB) , ... October 12, ... ... York Academy of Sciences today announced the three Winners and six Finalists of ... Awards are given annually by the Blavatnik Family Foundation and administered by the ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... United States multicenter, prospective clinical study that demonstrates the accuracy of the ... of identifying clinically significant acute bacterial and viral respiratory tract infections by ...
(Date:10/12/2017)... ... October 12, 2017 , ... AMRI, a ... biotechnology industries to improve patient outcomes and quality of life, will now be ... are being attributed to new regulatory requirements for all new drug products, including ...
(Date:10/11/2017)... ... October 11, 2017 , ... At its ... announced Dr. Suneel I. Sheikh, the co-founder, CEO and chief research scientist of ... been selected for membership in ARCS Alumni Hall of Fame . ASTER ...
Breaking Biology Technology:
(Date:10/4/2017)... Oct. 4, 2017  GCE Solutions, a global clinical research organization ... document anonymization solution on October 4, 2017. Shadow is designed to ... comply with policy 0070 of the European Medicines Agency (EMA) in ... ... ...
(Date:6/30/2017)... June 30, 2017 Today, American Trucking ... supplier of face and eye tracking software, became ... provider program. "Artificial intelligence and ... to monitor a driver,s attentiveness levels while on ... able to detect fatigue and prevent potential accidents, ...
(Date:5/16/2017)... TEANECK, N.J. , May 16, 2017  Veratad ... leading provider of online age and identity verification solutions, ... the K(NO)W Identity Conference 2017, May 15 thru May ... Ronald Regan Building and International Trade Center. ... across the globe and in today,s quickly evolving digital ...
Breaking Biology News(10 mins):