APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

12 Mar 2012

Volume 100, Issue 11, Articles (11xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 111101 (2012); http://dx.doi.org/10.1063/1.3691957 (3 pages)

Christina Alpmann, Michael Esseling, Patrick Rose, and Cornelia Denz
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds

Temperature dependent droplet impact dynamics on flat and textured surfaces

Azar Alizadeh, Vaibhav Bahadur, Sheng Zhong, Wen Shang, Ri Li, James Ruud, Masako Yamada, Liehui Ge, Ali Dhinojwala, and Manohar Sohal

Appl. Phys. Lett. 100, 111601 (2012); http://dx.doi.org/10.1063/1.3692598 (4 pages) | Cited 4 times

Online Publication Date: 15 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Droplet impact dynamics determines the performance of surfaces used in many applications such as anti-icing, condensation, boiling, and heat transfer. We study impact dynamics of water droplets on surfaces with chemistry/texture ranging from hydrophilic to superhydrophobic and across a temperature range spanning below freezing to near boiling conditions. Droplet retraction shows very strong temperature dependence especially on hydrophilic surfaces; it is seen that lower substrate temperatures lead to lesser retraction. Physics-based analyses show that the increased viscosity associated with lower temperatures combined with an increased work of adhesion can explain the decreased retraction. The present findings serve as a starting point to guide further studies of dynamic fluid-surface interaction at various temperatures.
Show PACS
47.55.D- Drops and bubbles
68.08.Bc Wetting
66.20.-d Viscosity of liquids; diffusive momentum transport

Systematically controlling Kapitza conductance via chemical etching

John C. Duda and Patrick E. Hopkins

Appl. Phys. Lett. 100, 111602 (2012); http://dx.doi.org/10.1063/1.3695058 (4 pages) | Cited 7 times

Online Publication Date: 15 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We measure the thermal interface conductance between thin aluminum films and silicon substrates via time-domain thermoreflectance from 100 to 300 K. The substrates are chemically etched prior to aluminum deposition, thereby offering a means of controlling interface roughness. We find that conductance can be systematically varied by manipulating roughness. In addition, transmission electron microscopy confirms the presence of a conformal oxide for all roughnesses, which is then taken into account via a thermal resistor network. This etching process provides a robust technique for tuning the efficiency of thermal transport while alleviating the need for laborious materials growth and/or processing.
Show PACS
68.35.Ja Surface and interface dynamics and vibrations
66.70.Df Metals, alloys, and semiconductors
81.65.Cf Surface cleaning, etching, patterning
73.25.+i Surface conductivity and carrier phenomena
68.35.Ct Interface structure and roughness
78.20.N- Thermo-optic effects

Misfit dislocations in multimetallic core-shelled nanoparticles

Yong Ding, Xiaolian Sun, Zhong Lin Wang, and Shouheng Sun

Appl. Phys. Lett. 100, 111603 (2012); http://dx.doi.org/10.1063/1.3695332 (4 pages) | Cited 4 times

Online Publication Date: 15 March 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Core-shelled multimetallic nanoparticles have unique catalytic properties compared to their single-element counterparts. Due to the different lattice parameters of the core and shell, the strain field is built up at the interface between the two phases. As for thin films, a formation of misfit and threading dislocations is an approach to release interface strain. However, for two-phase nanoparticles especially when their sizes are at nanometer scale, their dislocation formation in the volume remains to be investigated owing to the large surface-to-volume ratio. Here, we confirmed the existence of dislocations in the Au-FePt core-shelled nanoparticles of sizes less than 10 nm. It is suggested that the different atom sizes of the core and the shell materials are likely to be a key factor to generate and lock dislocations inside the nanoparticles.
Show PACS
61.72.Ff Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc.
68.60.Wm Other nonelectronic physical properties
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close