Flat Panel and LCD Screens, Part 2

By | 2017-11-07T14:38:27+00:00 June 24th, 2016|Materials Science, Semiconductor|

Figure 1: Unpowered Sony Ericsson S500i LCD screen at 200x magnification In our last blog post, I wrote about some of the physics and materials science principles that go into the design and manufacture of liquid-crystal display (LCD) screens.  The eponymous liquid crystals (LCs) in such a display have to be quite small in order to create a seamless image; as I mentioned in the last entry, the subpixels (the red, green and blue elements comprising a pixel, visible in Figure 1) can be smaller than a red blood cell.  Each of these subpixels needs its own [...]

Layered Composite Heaters for Semiconductor Processing

By | 2017-11-07T14:56:05+00:00 April 15th, 2016|Materials Science, Semiconductor, Thermal Management|

Figure 1: Composite layered heater from patent  US 9,224,626 B2 Alexander Glew, Ph.D., P.E. recently contributed to a new patent on an advanced thin-film electric heaters, layered composite heaters, for CVD semiconductor processing and related technologies titled “Composite substrate for layered heaters”.  Watlow Electric, based in St. Louis, hired Glew Engineering and Dr. Glew to help develop this heater technology due to his experience in the Silicon Valley’s semiconductor industry.  As a semiconductor equipment expert and materials engineering consultant, Dr. Glew’s familiarity with semiconductor manufacturing meant he understood both the limitations of common semiconductor chuck heating methods and the techniques that [...]

Thermal Expansion in a Glass and Aluminum Window: Part 2

By | 2017-08-12T16:31:30+00:00 March 17th, 2016|Finite Element Analysis, Materials Science, Mechanical Engineering, Thermal Management|

Figure 1: Simplified model of an aluminum-glass window   In last week’s blog, Thermal Expansion in a Glass and Aluminum Window: Part 1, we introduced the basic concept of thermal expansion in solid materials.  Since CTE mismatch can impose extremely high stress, during mechanical engineering design one must consider the temperature exposure and expansion or contraction of a material.  In order to help the read gain insight, we used a simplified aluminum-framed window to demonstrate that a hot summer day would be enough to shatter glass if the window wasn’t equipped with a flexible gasket between [...]

Thermal Expansion in a Glass and Aluminum Window: Part 1

By | 2017-11-08T15:17:20+00:00 March 12th, 2016|Finite Element Analysis, Materials Science, Mechanical Engineering|

Equipment designers must accommodate thermal expansion (CTE)of dissimilar materials, especially when they are subject to large temperature changes.  This problem is often called "CTE mismatch."  In this blog, we give the fundamentals of thermal expansion calculations used in thermo-mechanical analysis. These calculations are simple but useful, and easy enough to perform by hand or with a spread sheet. For more complicated shapes, one must use computer modeling.  As an example, we perform a finite element analysis (FEA) in a later blog //glewengineering.com/thermal-expansion-in-a-glass-and-aluminum-window-part-2/, of a glass and aluminum window and frame to show where the stress is [...]

Italian Masters: Galileo’s Stellar Science and Engineering

By | 2017-11-07T16:47:54+00:00 March 10th, 2016|Materials Science, Mechanical Engineering|

Portrait of Galileo Galilei Justus Sustermans [Public domain], via Wikimedia Commons I’d like to return to our previous series on the Italian Masters, focused not on the usual masters or painting and sculpture but on the masters or science, mathematics, and engineering.  So far in the series I’ve written about the accomplishments of Volta, Cassini, Venturi and Torricelli.  Today, I’d like to look at one of the greats: Galileo Galilei.  Galileo is most famous today for standing up for heliocentrism against the Catholic Church and spending the last years of his life under house arrest as [...]

Italian Masters: Volta Jump-Starts Electrical Engineering

By | 2017-11-07T16:51:43+00:00 February 25th, 2016|Electrical Engineering, Materials Science|

Figure 1: Allesandro Volta We’ve been taking a break from hard-hitting mechanical engineering and materials science blogs with some pieces on the Italian masters of science, mathematics and engineering in the 16-19th centuries.  I’ve previously explored the lives and contributions of Evangelista Torricelli, Giovanni Venturi and Giovanni Cassini.  For this blog, I’m focusing on Alessandro Volta, who helped revolutionize our understanding of electricity and electrochemstry it in the late 18th century.  […]

12 Years a Martian: Mechanical Engineering on Mars, The Red Planet

By | 2017-11-08T15:31:06+00:00 February 22nd, 2016|Materials Science, Mechanical Engineering|

Figure 1: Mars Exploration Rover mobility testing By NASA [Public domain], via Wikimedia Commons I’ve been writing a short blog series celebrating Mars Exploration Rover B (MER-B) Opportunity’s 12th anniversary of its landing on Mars.  Opportunity has exceeded its original three-month design lifetime by 48 times, and is still operating every day.  In previously entries I’ve covered the hazardsOpportunity faces on hostile surface of the red planet as well as some of the advanced materials science technologies that it uses to survive.  In this entry, I’ll look at some of themechanical engineer design choices that have [...]

12 Years a Martian: Materials Science on the Red Planet

By | 2017-11-09T10:25:54+00:00 February 11th, 2016|Materials Science, Mechanical Engineering|

Figure 1: Diagram of the scientific equipment on MER-B Opportunity Mars Exploration Rover Launches Press Kit, June 2003, p. 41 [i] I mentioned in a blog last week that Mars Exploration Rover B (FIgure 1), more affectionately called Opportunity, recently celebrated the 12th anniversary (in Earth years) of its landing on Mars.  12 years without maintenance on the hostile surface of another planet is incredible, considering the original operational time was planned for only 3 months.  Mars Science Laboratory Curiosity currently gets the most press, with its larger tool library and fancier cameras, but there are still [...]

12 Years a Martian: Engineering Challenges on the Red Planet

By | 2017-05-03T14:30:56+00:00 February 4th, 2016|Electrical Engineering, Materials Science, Mechanical Engineering|

Figure 1: Mars Exploration Rover By NASA/JPL/Cornell University, Maas Digital LLC [Public domain], via Wikimedia Commons Depending on which Facebook pages or Twitter feeds you follow, some of you may have caught wind that Opportunity (Mars Exploration Rover B, Figure 1) recently passed its twelfth anniversary of its landing on the red planet.  Opportunity’s ongoing trek across Mars represents a fantastic accomplishment in engineering.  At the time I’m writing this, the rover has been in continual operation for over 4,300 Earth days (that’s about 4,185 Sols, or Martian days).  Considering its original planned mission time of [...]

Materials Science News: 2-D Phophorus Used to Make Tiny 2-D Drumheads

By | 2017-05-05T11:26:04+00:00 January 11th, 2015|Materials Science, Mechanical Engineering|

A close look at how 2-D phosphorus is being used in 2-Dimensional drumhead resonators, and what this means for future electronic devices.

New Class of Electronic Devices Could Come From 2-D Transistors

By | 2017-05-08T11:24:49+00:00 July 9th, 2014|Materials Science, Mechanical Engineering, Semiconductor|

Thin-film transistors and field emission transistors made from 2-D materials could lead to a new class of electronic devices.

UC Riverside Engineering Team Uses Silly Putty to Improve Batteries

By | 2017-05-08T11:49:44+00:00 May 16th, 2014|Electrical Engineering, Materials Science, Mechanical Engineering|

UC Riverside engineering team uses silicon dioxide found in Silly Putty to improve lithium-ion batteries.

Semiconductor Processing and Integrated Circuits, Part 8: Chemical Vapor Deposition Basics

By | 2017-05-25T15:49:34+00:00 April 11th, 2014|Materials Science, Semiconductor|

A basic review of chemical vapor deposition and how it is used in semiconductor processing.

Series on Semiconductor Processing and Integrated Circuits, Part 6: Multilayer Photoresist Processing

By | 2017-05-09T12:07:22+00:00 April 4th, 2014|Materials Science, Mechanical Engineering, Semiconductor|

A look at multilayer photoresist processing.

Series on Semiconductor Processing and Integrated Circuits, Part 5: Development Methods

By | 2017-05-26T11:30:41+00:00 March 28th, 2014|Materials Science, Mechanical Engineering, Semiconductor|

A review of semiconductor processing, specifically various development processes.