VACUUM SCIENCE BLOG

The key working principles of High and Ultra-High vacuum pumps

In our previous blog post, High Vacuum (HV) and Ultra-High Vacuum (UHV) levels can only be effectively and efficiently obtained by using a main pump that has the functional capabilities. Choosing which pump to use depends on a number of factors, such as noise/vibration, cost (initial and on-going), tolerance to contamination, footprint, maintenance schedules, and resilience to shock.

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Introduction to Vacuum Coating by Thermal Evaporation

In our previous blog post, Introduction to Vacuum Coating Technology, we shared various PVD (Physical Vapor Deposition) methods and showed typical products being coated using vacuum technologies. Thin films can be adhered to metal, glass, plastics, ceramics, or paper. In this blog post we will focus on Thermal Evaporation techniques.

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How to reduce outgassing in vacuum systems

 

This blog is based on the article in Applied Science and Convergence Technology 26 (5): 95-109 (2017) R Grinham and A Chew.

There are four main ways you can reduce outgassing in your vacuum system. These are: cleaning and handling, surface treatment, passivation, and purging and backfilling. In this blog, we will take a closer look at each of these methods. 

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Introduction to outgassing

 

This blog is based on the article in Applied Science and Convergence Technology 26 (5): 95-109 (2017) R Grinham and A Chew.

There are several contributions to the gas load of a system. At pressures below ~0.1 mbar, the most dominant is often ‘outgassing’. Outgassing is the result of desorption of previously adsorbed molecules, bulk diffusion, permeation and vapourisation. Adsorption occurs via two main processes, physisorption and chemisorption, and can be described using five (or six) classifying isotherms. 

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When to Use Direct vs Indirect Gauges

 

Measuring vacuum pressure is a fundamental element of all vacuum applications, but there’s no such thing as a universal vacuum gauge.

When it comes to measuring vacuum pressure, no single gauge will respond accurately throughout the entire vacuum range (from atmospheric pressure to 10-12 mbar). That’s why a clear understanding of the differences between the types of gauges is essential to match them to the right operational contexts. 

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5 Ways Vacuum Contributes to Space Simulation & Research

 

Space technology and research would be nowhere without vacuum technology. But, with such complex work, it’s easy to lose sight of where (and how and why) vacuum plays such an important role. So we’ve published a new eBook that unpacks the most common applications of vacuum technology in space — with details on how it supports space flights, space simulation and vacuum testing and fundamental space research.

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Introduction to Vacuum Coating Technology

 

Vacuum Coating — also called ‘Thin Film Technology’; or Physical Vapour Deposition (PVD) — represents an impressive share among the various applications of vacuum technology. In this blog post, we share an overview of the historical development, the various basic principles underpinning the generating of thin films, and the general layout of coating devices.

 

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100 Years of the Holweck Vacuum Pump

 

2020 marks the centenary of the development of the Holweck pump by the French physicist Fernand Holweck. As well as a stand-alone pump the Holweck design is used as a compound pumping stage in the widely employed TURBOVAC, nEXT and STP pumps. In this respect the Holweck design has been utilised to make significant advancements and improvements to the development of turbomolecular pumps over the last half century.

 

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18th International Conference on Thin Films & 18th Joint Vacuum Conference

 

The JVC-18 is a well established meeting organised at two-year periods by the Austrian, Croatian, Czech, Hungarian, Slovak and Slovenian national vacuum societies. The International Conference on Thin Films is a tri-annual conference series endorsed and co-organised by the Thin Film Division of the International Union for Vacuum Science, Technique and Applications (IUVSTA). These events are scheduled from November 22 to 26, 2020 by the Hungarian Vacuum Society (HVS).

 

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Mass Spectrometry in Forensic Science – a brief history

What is mass spectrometry?

Mass spectrometry – an analytical technique that measures the mass-to-charge ratio of ions and, in forensic science, one of the best ways for toxicologists to identify and analyse substances.

In the forensic community, it’s heralded as the “gold standard” and the “near universal test” for isolating and assessing unknown agents. As a result, its widest application is in the analysis of drugs (including drug metabolites and drug paraphernalia).

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