Preparation of Cellulose-Based Honeycomb-Patterned Films with ATRP-Active Surfaces

2012 ◽  
pp. 37-55 ◽  
Author(s):  
Ana F. Xavier ◽  
John F. Kadla
Keyword(s):  
Active Surfaces ◽  
Patterned Films

scholarly journals Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

2017 ◽  
Vol 9 (4) ◽  
pp. 4177-4183 ◽  
Author(s):  
Yuchen Zhou ◽  
Junjie Huang ◽  
Wei Sun ◽  
Yuanlai Ju ◽  
Pinghui Yang ◽  
...  
Keyword(s):  
Active Surfaces ◽  
Breath Figure

scholarly journals Velvet fingers: Grasp planning and execution for an underactuated gripper with active surfaces

2014 ◽  
Author(s):  
Robert Krug ◽  
Todor Stoyanov ◽  
Manuel Bonilla ◽  
Vinicio Tincani ◽  
Narunas Vaskevicius ◽  
...  
Keyword(s):  
Grasp Planning ◽  
Active Surfaces

PtNiFe Nanoalloys with Co-existence of Energy-optimized Active surfaces for Synergistic Catalysis of Oxygen Reduction and Evolution

2021 ◽  
Author(s):  
wei yang ◽  
Wenbin Gong ◽  
Yanhong Shi ◽  
Xiaona Wang ◽  
Yulian Wang ◽  
...  
Keyword(s):  
Transition Metals ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Reduction Reaction ◽  
Synergistic Catalysis ◽  
Active Surfaces

Platinum nanocatalysts mediated by 3d transition metals show improved activity for oxygen reduction reaction (ORR) but poor activity for oxygen evolution reaction (OER). Herein, we report the preparation of a...

scholarly journals Body Flexibility Enhances Maneuverability in the World’s Largest Predator

2018 ◽  
Vol 59 (1) ◽  
pp. 48-60 ◽  
Author(s):  
P S Segre ◽  
D E Cade ◽  
J Calambokidis ◽  
F E Fish ◽  
A S Friedlaender ◽  
...  
Keyword(s):  
Open Ocean ◽  
The Body ◽  
Long Distance ◽  
Active Surfaces ◽  
Aquatic Locomotion ◽  
And Performance ◽  
And Control ◽  
Blue Whales ◽  
Control Surfaces ◽  
Complex Trajectories

Abstract Blue whales are often characterized as highly stable, open-ocean swimmers who sacrifice maneuverability for long-distance cruising performance. However, recent studies have revealed that blue whales actually exhibit surprisingly complex underwater behaviors, yet little is known about the performance and control of these maneuvers. Here, we use multi-sensor biologgers equipped with cameras to quantify the locomotor dynamics and the movement of the control surfaces used by foraging blue whales. Our results revealed that simple maneuvers (rolls, turns, and pitch changes) are performed using distinct combinations of control and power provided by the flippers, the flukes, and bending of the body, while complex trajectories are structured by combining sequences of simple maneuvers. Furthermore, blue whales improve their turning performance by using complex banked turns to take advantage of their substantial dorso-ventral flexibility. These results illustrate the important role body flexibility plays in enhancing control and performance of maneuvers, even in the largest of animals. The use of the body to supplement the performance of the hydrodynamically active surfaces may represent a new mechanism in the control of aquatic locomotion.

Deformation of Porous, Nanostructured Silver at Room Temperature and 150 °C

2013 ◽  
Vol 1513 ◽  
Author(s):  
Guillaume Noiseau ◽  
Michael F. Becker ◽  
John W. Keto ◽  
Desiderio Kovar
Keyword(s):  
Room Temperature ◽  
Local Strain ◽  
Direct Write ◽  
Compression Tests ◽  
Sufficient Energy ◽  
Starting Point ◽  
Mean Size ◽  
Constant Displacement ◽  
Patterned Films ◽  
Porous Silver

ABSTRACTPorous, nanostructured silver samples were produced using a direct-write method where a nanoparticle aerosol consisting of particles with a mean size of approximately 5 nm were accelerated to speeds of approximately 1000 m/sec and impacted onto a translating substrate [1]. The impacting particles have sufficient energy to stick to the substrate, allowing patterned thick films to be directly written from the aerosol without a mask. Unlike other low temperature processing routes for achieving patterned films, no organics are added that can interfere with postdeposition processing. Typical films are 5- 100 μm thick, up to several centimeters long, and have an as-deposited relative densities as high as 70% of bulk Ag. Compression tests were carried out in steps at room temperature and at 150°C under constant displacement rates. Local strain and densification were measured by optical profilometry between each compression step. The results can be used as a starting point to better understand the mechanisms that govern plasticity, creep, and sintering in nanostructured, porous silver at low processing temperatures.

Photosensitive Polyimides

1989 ◽  
Vol 167 ◽  
Author(s):  
Hiroo Hiramoto
Keyword(s):  
Polymer Chains ◽  
Double Bonds ◽  
Acid Base ◽  
Film Properties ◽  
Covalent Bonds ◽  
Two Factors ◽  
Patterned Films ◽  
The Way

AbstractPhotosensitive polyimides are used as insulation and protection layers for microelectronics. They can easily give fine-patterned films with excellent characteristics of polyimides by photolithographic procedure.Photosensitive groups such as double bonds, azides, o-nitrobenzyl and o-naphthoquinonediazides. These photosensitive groups are incorporated to polymer chains through covalent bonds or acid-base ion bonds. Some polyimides have photosensitivity even without intentionally introduced photosensitive groups. Most of photosensitive polyimides are negative working, and a few of them are positive working.Characteristics of photosensitive polyimides are determined by two factors, the way of introducing photosensitive groups and the structures of polyimide backbone chains. Photosensitivity, resolution, purity and easiness of imidization mainly depends on the former factor. The film properties after curing are mainly determined by the latter. The film properties, however, are affected by the former when imide cyclization is imperfect.Photosensitive polyimides are widely used as protection and insulation layers of VLSI, multi-chip modules for computers, telecommunication, linephotosensors, thermal-heads, etc.

Infrared Studies of Novel Optically Responsive Materials: Orientation Characteristics of Sulfonated Polystyrene/Poly(Diallyldimethylammonium Chloride) Ionic Polymer Multilayers on Patterned Self-Assembled Monolayers

1997 ◽  
Vol 51 (4) ◽  
pp. 470-476 ◽  
Author(s):  
Vasilis G. Gregoriou ◽  
Rick Hapanowicz ◽  
Sarah L. Clark ◽  
Paula T. Hammond
Keyword(s):  
Film Surface ◽  
Polymeric Materials ◽  
Surface Characteristics ◽  
Self Assembled Monolayers ◽  
Sulfonated Polystyrene ◽  
Responsive Materials ◽  
Diallyldimethylammonium Chloride ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Patterned Films

Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) is utilized in the characterization of a new class of polymeric materials that exhibit unique optical properties. The differential nature of PM-IRRAS, coupled with the fact that the experiment was performed on a commercially available hardware setup, makes the technique ideal for studying selectively deposited polyion multilayers on metal surfaces. The system under study was a polymeric thin film of alternating bilayers of sulfonated polystyrene/poly(diallyldimethylammonium chloride) (SPS/PDAC) fabricated by ionic multilayer assembly. Specifically, patterned self-assembled monolayers (SAMs) of (Ω-functionalized alkane thiolates were used as the molecular template. Alternating layers of polyanion and polycation were then selectively adsorbed onto specific regions of the surface to form a patterned films of thicknesses from 150 to 400 Å. The total thickness of the film was measured at 150 Å with the use of ellipsometry. Polyion conformation plays a crucial role in the selectivity of the patterned film, film surface characteristics, and ultimately, the ability of these systems to function as optical devices. The infrared spectroscopic data give insight into chemical composition and conformation and show that the molecular orientation of polyions in these polymeric multilayer structures depends on the ionic content of the initial solutions.

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