Textured Surface Produced by Anisotropic Etching of Silicon and Its Frictional Properties

2005 ◽  
pp. 132-136
Author(s):  
Nobuyuki Moronuki ◽  
Daisuke Nishi ◽  
Kenji Uchiyama
Keyword(s):  
Anisotropic Etching ◽  
Textured Surface ◽  
Frictional Properties

Friction sensing mechanisms for perception and motor control: Passive touch without sliding may not provide perceivable frictional information

2021 ◽  
Author(s):  
Heba Khamis ◽  
Hafiz Malik Naqash Afzal ◽  
Jennifer Sanchez ◽  
Richard Martin Vickery ◽  
Michael Wiertlewski ◽  
...  
Keyword(s):  
Skin Surface ◽  
Friction Reduction ◽  
Initial Contact ◽  
Textured Surface ◽  
Conscious Perception ◽  
Flat Surfaces ◽  
Passive Touch ◽  
Frictional Properties ◽  
Tangential Forces ◽  
Exploratory Movements

Perception of the frictional properties of a surface contributes to the multidimensional experience of exploring various materials - we slide our fingers over a surface to feel it. In contrast, during object manipulation we grip objects without such intended exploratory movements. Given that we are aware of the slipperiness of objects or tools that are held in the hand, we investigated whether the initial contact between the fingertip skin and the surface of the object is sufficient to provide this consciously perceived frictional information. Using a two-alternative forced choice protocol we examined human capacity to detect frictional differences using touch, when two otherwise structurally identical surfaces were brought in contact with the immobilized finger perpendicularly or under an angle (20 or 30°) to the skin surface (passive touch). An ultrasonic friction reduction device was used to generate three different frictions over each of three flat surfaces with different surface structure: i) smooth glass, ii) textured surface with dome-shaped features, and iii) surface with sharp asperities (sandpaper). Participants (n = 12) could not reliably indicate which of two surfaces was more slippery under any of these conditions. In contrast, when slip was induced by moving the surface laterally by a total of 5 mm (passive slip), participants could clearly perceive frictional differences. Thus making contact with the surface, even with moderate tangential forces, was not enough to perceive frictional differences, instead conscious perception required a sufficient size slip.

scholarly journals Nanoscale Reciprocating Sliding Contact Behaviors of an Isosceles Trapezoid Textured Surface in Space Environment

2020 ◽  
Vol 01 ◽  
Author(s):  
Ruiting Tong ◽  
Zefen Quan ◽  
Geng Liu
Keyword(s):  
Friction Force ◽  
Small Amplitude ◽  
Md Simulation ◽  
Sliding Contact ◽  
Space Environment ◽  
Textured Surface ◽  
Friction Forces ◽  
Reciprocating Sliding ◽  
Frictional Properties ◽  
Isosceles Trapezoid

Background: In space environment, microgravity and vacuum influence the mechanical behaviors of the devices. In microgravity environment, the mechanical components will vibrate with a small amplitude once there is a disturbance. The vibration can be seen as a reciprocating sliding contact with a small amplitude. In addition to the vibration, adhesion effects are predominant in vacuum, which will induce a high friction force. Objective: To reduce the friction force, textured surfaces are widely used in mechanical engineering on the earth, and nanoscale textures are also verified that they can be used to improve the frictional behaviors of components with the size of nanometers. Methods: In this paper, the adhesion effects are considered by using molecular dynamics (MD) simulation, and the microgravity induced vibration is simplified as a reciprocating sliding contact. Coupling MD simulation and the finite element method, a multiscale method is used to investigate the frictional properties of nanoscale reciprocating sliding contact between rigid multi-asperity tips and an isosceles trapezoid textured surface. Results: Average friction forces for the different tips are presented, and the friction processes are analyzed. A stable friction process is discovered for a specific case, and the average friction forces keep at two stable values corresponding to two sliding directions. Conclusion: Compared with the total average friction forces of a smooth surface, the textured surface can reduce the friction forces greatly. This work could contribute to the textured surface design to improve frictional properties in space environment.

A Simple Texturization Approach for Mono-Crystalline Silicon Solar Cell with Low TMAH Concentration Solution

2011 ◽  
Vol 685 ◽  
pp. 26-30 ◽  
Author(s):  
Wei Ying Ou ◽  
Yao Zhang ◽  
Hai Ling Li ◽  
Lei Zhao ◽  
Chun Lan Zhou ◽  
...  
Keyword(s):  
Solar Cell ◽  
Silicon Solar Cell ◽  
Crystalline Silicon ◽  
Cost Effective ◽  
Anisotropic Etching ◽  
Silicon Wafers ◽  
Tetramethylammonium Hydroxide ◽  
Textured Surface ◽  
Crystalline Silicon Solar Cell ◽  
Tmah Solution

Texturing for mono-crystalline silicon solar cell by chemical anisotropic etching is one of the most important techniques in photovoltaic industry. In recent years, tetramethylammonium hydroxide (TMAH) solution or a mixture of TMAH solution with IPA was reported to be used for random pyramids texturization on silicon surface due to its non-volatile, nontoxic, good anisotropic etching characteristics and uncontaminated metal ions. However, most of the studies were reported about the etching processes by using high TMAH concentration solutions. In this study, a simple and cost-effective approach for texturing mono-crystalline silicon wafers in low TMAH concentration solutions was proposed. Etching was performed on (100) silicon wafers using silicon-dissolved tetramethylammonium hydroxide (TMAH) solutions (0.5~1 %) without addition of surfactant. The surface phenomena, surface morphology and surface reflectance have been analyzed. A textured surface with smaller and smooth pyramids can be realized by using 1 % silicon-dissolved TMAH solutions.

Development of a Cutting Tool with a Textured Surface for Dry Cutting of Aluminum Alloys

2009 ◽  
Vol 3 (2) ◽  
pp. 199-203 ◽  
Author(s):  
Tatsuya Sugihara ◽  
◽  
Toshiyuki Enomoto
Keyword(s):  
Aluminum Alloys ◽  
Environmental Impact ◽  
Cutting Tool ◽  
Face Milling ◽  
Cutting Conditions ◽  
Textured Surface ◽  
Dry Cutting ◽  
Tool Breakage ◽  
Frictional Properties ◽  
Aluminum Chips

The demand for dry/near-dry cutting has been rapidly increasing to reduce the environmental impact. However, cutting technologies for aluminum alloys have not actually gained widespread use because the aluminum chips adhere strongly to the cutting edge of the tool, leading to tool breakage. To solve this problem, a cutting tool with a banded textured surface was developed, and a series of face-milling experiments for aluminum alloys showed that the textured surface significantly improves the anti-adhesive and anti-frictional properties at the tool-chip interface under dry cutting conditions.

Effect of Polymer, Road Surface, and Driving Conditions on Wear Surface Characteristics of Tire Treads

1973 ◽  
Vol 1 (4) ◽  
pp. 354-362 ◽  
Author(s):  
F. R. Martin ◽  
P. H. Biddison
Keyword(s):  
Wear Surface ◽  
Surface Characteristics ◽  
Road Surface ◽  
The Other ◽  
Mechanical Degradation ◽  
Textured Surface ◽  
Test Track ◽  
Driving Conditions ◽  
Styrene Butadiene ◽  
Cylindrical Particles

Abstract Treads made with emulsion styrene-butadiene copolymer (SBR), solution SBR, polybutadiene (BR), and a 60/40 emulsion SBR/BR mixture were built as four-way tread sections on G78-15 belted bias tires, which were driven over both concrete and gravel-textured highways and on a small, circular, concrete test track. The tires were front mounted. When driven on concrete highway, all except the BR tread had either crumbled- or liquid-appearing surfaces, thought to have been formed by mechanical degradation or fatigue. When cornered on concrete, these materials formed small cylindrical particles or rolls. The BR tread had a smooth, granular-textured surface when driven on concrete highway and a ridge or sawtooth abrasion pattern when cornered on concrete. All the materials appeared rough and torn when run on gravel-textured highway. The differences in wear surface formed on BR tread and the other three are thought to be due primarily to the relatively high resilience of BR.

FEDERATED No. 8

Alloy Digest ◽  
1956 ◽  
Vol 5 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Frictional Properties ◽  
Good Corrosion Resistance ◽  
High Speeds ◽  
Bearing Alloy

Abstract FEDERATED No. 8 is a lead-base bearing alloy recommended for moderate to high speeds and moderate loads. It has very good frictional properties, reasonably good corrosion resistance and low price. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fatigue. It also includes information on casting and joining. Filing Code: Pb-3. Producer or source: Federated Metals Corporation, ASARCO Inc..

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