scholarly journals Wrinkling of Ultrathin Polymer Films

2006 ◽  
Vol 924 ◽  
Author(s):  
Rui Huang ◽  
Christopher M. Stafford ◽  
Bryan D. Vogt
Keyword(s):  
Experimental Data ◽  
Surface Layer ◽  
Surface Properties ◽  
Polymer Films ◽  
Critical Strain ◽  
Finite Thickness ◽  
Surface Effects ◽  
Experimental Measurements ◽  
Conventional Analysis ◽  
Ultrathin Polymer Films

ABSTRACTThis paper presents a bilayer model to account for surface effects on the wrinkling of ultrathin polymer films. Assuming a surface layer of finite thickness, effects of surface properties on the critical strain, the equilibrium wavelength, and the wrinkle amplitude are discussed in comparison with conventional analysis. Experimental measurements of wrinkling in polymer films with thickness ranging from 200 nm to 5 nm are conducted. The bilayer model provides a consistent understanding of the experiments that deviate from conventional analysis for thickness less than 30 nm. A set of empirical surface properties is deduced from the experimental data.

Gradient Interphases in Polymer Nanocomposites

2009 ◽  
Author(s):  
Rui Qiao ◽  
L. Cate Brinson
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Polymer Nanocomposites ◽  
Polymer Films ◽  
Experimental Approach ◽  
Polymer Surface ◽  
Representative Volume ◽  
Representative Volume Elements ◽  
Ultrathin Polymer Films ◽  
Realistic Data

As revealed by experimental data on ultrathin polymer films [1, 2], polymer mobility changes in a gradient fashion away from the polymer-surface interface. However, little is yet known on gradients in mechanical properties in polymer nanocomposites. In this work, we discuss a novel nanoindentation experimental approach to measure these properties in model nanocomposite systems, the associated modeling to extract realistic data (Figure1), and simulations of representative volume elements (RVE) of nanocomposites including interphase layers (Figure2).

Polymer Films with Tunable Surface Properties: Separation of an Oil-in-Water Emulsion at Poly(3-methylthiophene)

Langmuir ◽  
1995 ◽  
Vol 11 (8) ◽  
pp. 2920-2925 ◽  
Author(s):  
Walter Torres ◽  
John C. Donini ◽  
Anton A. Vlcek ◽  
A. B. P. Lever
Keyword(s):  
Surface Properties ◽  
Polymer Films ◽  
Water Emulsion ◽  
Oil In Water ◽  
Oil In Water Emulsion

A Comparison of Analytical Predictions With Experimental Measurements of Transmission Error of Misaligned Loaded Gears

1992 ◽  
Author(s):  
Harsh Vinayak ◽  
Donald R. Houser
Keyword(s):  
Experimental Data ◽  
Load Distribution ◽  
Theoretical Calculations ◽  
Data Acquisition System ◽  
Transmission Error ◽  
Test Facility ◽  
Experimental Measurements ◽  
Gear Pair ◽  
Prediction Program ◽  
Dynamic Transmission Error

Abstract This paper deals with the experimental study of dynamic transmission error of a gear pair. Two aspects of the experiment are discussed : 1) design of the test facility and data acquisition system and 2) comparison of transmission error and load distribution with experimental data. Several gears were tested under varying misalignments. A prediction program LDP (Load distribution Program) was used for theoretical calculations of dynamic transmission error.

scholarly journals New Possibilities of Shaping the Surface Properties in Austempered Ductile Iron Castings

2013 ◽  
Vol 13 (1) ◽  
pp. 103-106 ◽  
Author(s):  
D. Myszka
Keyword(s):  
Surface Layer ◽  
Surface Properties ◽  
Ductile Iron ◽  
Shot Peening ◽  
Austempered Ductile Iron ◽  
Protective Atmosphere ◽  
Detonation Spraying ◽  
Iron Castings ◽  
Recent Developments ◽  
Commercial Applications

Abstract The paper presents recent developments concerning the formation of surface layer in austempered ductile iron castings. It was found that the traditional methods used to change the properties of the surface layer, i.e. the effect of protective atmosphere during austenitising or shot peening, are not fully satisfactory to meet the demands of commercial applications. Therefore, new ways to shape the surface layer and the surface properties of austempered ductile iron castings are searched for, to mention only detonation spraying, carbonitriding, CVD methods, etc.

Composite membranes from photochemical synthesis of ultrathin polymer films

Nature ◽  
1991 ◽  
Vol 352 (6330) ◽  
pp. 50-52 ◽  
Author(s):  
Chao Liu ◽  
Charles R Martin
Keyword(s):  
Polymer Films ◽  
Composite Membranes ◽  
Photochemical Synthesis ◽  
Ultrathin Polymer Films

scholarly journals A combined model for pseudo-rapidity distributions in Cu–Cu collisions at BNL-RHIC energies

2016 ◽  
Vol 25 (04) ◽  
pp. 1650025 ◽  
Author(s):  
Z. J. Jiang ◽  
J. Wang ◽  
Y. Huang
Keyword(s):  
Experimental Data ◽  
Proper Time ◽  
Charged Particles ◽  
Dense Matter ◽  
Rapidity Distribution ◽  
Experimental Measurements ◽  
Combined Model ◽  
Model Predictions ◽  
Phobos Collaboration ◽  
Rapidity Distributions

The charged particles produced in nucleus–nucleus collisions come from leading particles and those frozen out from the hot and dense matter created in collisions. The leading particles are conventionally supposed having Gaussian rapidity distributions normalized to the number of participants. The hot and dense matter is assumed to expand according to the unified hydrodynamics, a hydro model which unifies the features of Landau and Hwa–Bjorken model, and freeze out into charged particles from a time-like hypersurface with a proper time of [Formula: see text]. The rapidity distribution of this part of charged particles can be derived analytically. The combined contribution from both leading particles and unified hydrodynamics is then compared against the experimental data performed by BNL-RHIC-PHOBOS Collaboration in different centrality Cu–Cu collisions at [Formula: see text] and 62.4[Formula: see text]GeV, respectively. The model predictions are consistent with experimental measurements.

scholarly journals Study of structural evolution during controlled degradation of ultrathin polymer films

Polymer ◽  
2010 ◽  
Vol 51 (23) ◽  
pp. 5550-5555 ◽  
Author(s):  
Mojammel H. Mondal ◽  
M. Mukherjee
Keyword(s):  
Polymer Films ◽  
Structural Evolution ◽  
Ultrathin Polymer Films

Surface Viscoelasticity Studies of Ultrathin Polymer Films Using Atomic Force Microscopic Adhesion Measurements

2001 ◽  
Vol 34 (12) ◽  
pp. 4180-4185 ◽  
Author(s):  
X. P. Wang ◽  
Xudong Xiao ◽  
O. K. C. Tsui
Keyword(s):  
Polymer Films ◽  
Atomic Force ◽  
Ultrathin Polymer Films
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