Showcasing accurate and controlled plasma cleaning at SEMT 2017

Exhibition at the annual Society of Electron Microscope Technology meeting 2017.

 

SEMT Logo

Affiliated to the Royal Microscopical Society, the Society of Electron Microscope Technology (SEMT) is a forum for ideas on techniques and applications in microscopy. It has become one of the foremost user groups in the country, addressing all aspects of microscopy from instrument design and specimen preparation to digital image acquisition.

The society’s annual meeting will be held on the 6th December at the Natural History Museum in London and hosted by the museum’s ‘Imaging and Analysis Centre’ representatives. It promises to be a fascinating and informative day which we are very much looking forward to. Please do stop by and say hello!

Find out more about the event here

View our application note on TEM Sample holder decontamination here

Categorised in: News & Events

Effect of plasma surface treatment of PDMS on the permeation of pharmaceutical compounds

Plasma surface treatment of PDMS membrane for permeation of pharmaceutical compounds

We recently received a nice acknowledgment in the following article from Dr. Laura Waters’ group at Huddersfield University.

An image of our UK Manufactured Henniker Plasma Treatment Equipment - HPT-100

Our model HPT-100 (pictured above), as used by Huddersfield University, is optimised for accurate, dependable and repeatable treatment of PDMS membrane and is contributing to world class research both here and in many departments across the globe. We value our close research ties very highly and are always priviledged when we have the opportunity to be involved in work of this nature.

Read an excerpt from the article below or for more information on our services scroll to the bottom of the page and click on the links.


Effect of plasma surface treatment of PDMS on the permeation of pharmaceutical compounds

Laura J Waters, Catherine V.Finch, A.K.M Mehedi H. Bhuiyan, Karl Hemming, John C. Mitchell | Department of Pharmacy, School of Applied Science, University of Huddersfield, Queensgate, Huddersfield HD1 3DH, UK | Medway Centre for Pharmaceutical Sciences, University of Greenwich, Chatham, Kent ME4 4TB, UK | Received 2 February 2017, Revised 15 May 2017, Accepted 15 May 2017, Available online 19 May 2017 | Courtesy of www.sciencedirect.com

Abstract

This paper addresses the modification of poly(dimethylsiloxane), i.e. PDMS, using plasma surface treatment and a novel application of the membrane created. A set of model compounds were analysed to determine their permeation through PDMS, both with and without plasma treatment. It was found that plasma treatment reduced permeation for the majority of compounds but had little effect on some compounds, such as caffeine, with results indicating that polarity plays an important role in permeation, as is seen in human skin. Most importantly, a direct correlation was observed between plasma-modified permeation data and literature data through calculation of membrane permeability (Kp) values suggesting plasma-modified silicone membrane (PMSM) could be considered as a suitable in vivo replacement to predict clinical skin permeation.

Graphical abstract

Plasma-modified silicone membrane has been proven to be a suitable replacement for clinical studies when determining permeation of compounds through the skin. This is the first study to propose that by modifying the surface with plasma treatment, it becomes far more ‘skin like’ thus allowing it to be used in analytical applications as a potential skin mimic system.

Keywords

  • Permeation
  • PDMS
  • Silicone
  • Plasma
  • Flux
  • Hydrophobicity

Acknowledgements

The authors wish to thank Henniker Ltd for supporting this study.


To view the remaining part of this article please use the link below

Categorised in: News & Events

Improvement in Adhesion Property of PTFE

Improvement in Adhesion Property of Polytetrafluoroethylene (PTFE) via Heat-Assisted Plasma Treatment Using a Heater

Researchers in Japan show how heat asssisted plasma treatment makes a drastic improvement of the adhesion properties of PTFE

A plasma etched PTFE Surface An untreated PTFE Surface


Read an excerpt from the article below:

drastic improvement in adhesion property of ptfe VIA heat assisted plasma treatment using a heater

Yuji Ohkubo, Kento Ishihara, Masafumi Shibahara, Asahiro Nagatani, Koji Honda, Katsuyoshi Endo & Kazuya Yamamura | Scientific Reports 7, Article number: 9476 (2017) | doi:10.1038/s41598-017-09901-y  | Published online: | Courtesy of www.nature.com

ABSTRACT

The heating effect on the adhesion property of plasma-treated polytetrafluoroethylene (PTFE) was examined. For this purpose, a PTFE sheet was plasma-treated at atmospheric pressure while heating using a halogen heater. When plasma-treated at 8.3 W/cm2 without using the heater (Low-P), the surface temperature of Low-P was about 95 °C. In contrast, when plasma-treated at 8.3 W/cm2 while using the heater (Low-P+Heater), the surface temperature of Low-P+Heater was controlled to about 260 °C. Thermal compression of the plasma-treated PTFE with or without heating and isobutylene−isoprene rubber (IIR) was performed, and the adhesion strength of the IIR/PTFE assembly was measured via the T-peel test.

The adhesion strengths of Low-P and Low-P+Heater were 0.12 and 2.3 N/mm, respectively. Cohesion failure of IIR occurred during the T-peel test because of its extremely high adhesion property. The surfaces of the plasma-treated PTFE with or without heating were investigated by the measurements of electron spin resonance, X-ray photoelectron spectroscopy, nanoindentation, scanning electron microscopy, and scanning probe microscopy. These results indicated that heating during plasma treatment promotes the etching of the weak boundary layer (WBL) of PTFE, resulting in a sharp increase in the adhesion property of PTFE.


To view the remaining part of this article please use the link below


Categorised in: News & Events

Henniker to attend JADH Adhesion Conference

JADH conference ’17

Henniker Exhibiting at JADH 17 – Adhesion Conference

We are exhibiting at and sponsoring the upcoming conference on the science and technology of adhesion and adhesives being held in Saint Maxime in the South of France from 8-13 October.

JADH-Exhibition-Altec-Henniker-Plasma-News-Image

As a leading manufacturer of plasma treatment equipment to improve adhesion we are delighted to be supporting this event and will be showcasing our range of processes and technology which can improve adhesive bonding for a wide range of materials.

Please come along to see how we can help.

The conference runs from 8th -13th of october for more details please visit the official conference site here

We look forward to seeing you there!

Categorised in: News & Events

The Francis Crick Institute, Making Lab

Henniker Plasma Technology supporting research at the Innovative Life Science Research Lab

The Making Lab Science Technology Platform (STP) at The Francis Crick Institute brings together life science research into the construction and use of devices such as microfabricated instruments to control biological systems, microfluidics to move and manipulate the fluid environment, micro-contacting printing to precisely control cell-substrate interactions, sensors to measure biological activities and devices aiding biomedical imaging.

 Dr. Desai’s group are positioned to lead a global trend in biology that is enabling the move toward low-cost iterative design of instruments and equipment which are tailor-made for individual groups and experiments. The lab provides researchers with the tools, expertise and training needed to make devices to aid their work as well as  a forum to share expertise. Henniker Plasma’s HPT model plasma surface treatment system was recently installed to provide a robust and proven tool for reliable bonding of PDMS to various substrates in the fabrication of microfluidic devices.

“Henniker guided us to choose the most suitable plasma unit for our application, ensured an accelerated delivery time & guided us through the very easy setup. We obtained quality results with their unit within minutes of setup & consistent results thereafter. The support they have provided has been rapid and helpful.”

Dr Ravi Desai, Making Lab, The Francis Crick Institute

Categorised in: News & Events

Plasma Treatment of PDMS leads to Improved Adhesion / Bonding

Plasma Treatment of PDMS for improved adhesion / bonding performance of microfluidic devices – new application note available now.

 

Hexagons-showing-images-from-PDMS-application note

What is PDMS?
Polydimethylsiloxane (PDMS) – is a member of a group of polymeric organosilicon compounds that are widely known as silicones.

It is the most widely used of these compounds and is featured in applications ranging from medicines and cosmetics to silly putty. In this application we concentrate on the use of PDMS in microfluidic device fabrication.

PDMS-Chemical-structure

Fig 1. Molecular structure of PDMS.

Why PDMS?

PDMS has a number of properties which make it favourable for use in creating microfluidic devices.

  • Biocompatible
  • Low cost
  • Few nm resolution moulding
  • Low auto florescence
  • Transparent (240nm – 1100nm range)

Despite these advantages PDMS has one key limitation, it’s poor adhesion to glass. When used in the microfluidic application this can lead to premature device failure. Henniker’s systems are routinely used for plasma surface treatment of PDMS in microfluidic laboratories throughout the world, here we show you how to achieve optimal device bonding results using our equipment.

Our Solution

The Henniker HPT-200 system is developed and optimised to produce consistent plasma treatment performance for reliable & repeatable bonding of PDMS. Both the glass and PDMS substrates are treated with air plasmas, at low pressure, with all settings under microprocessor control.

Henniker's plasma treatment system the HPT-200

On both substrates the treatment is effective at removing hydrocarbon groups (CxHy) leaving behind silanol groups on the PDMS and OH groups on the glass substrate respectively. This allows strong Si – O – Si covalent bonds to form between the two materials via the process as shown in Fig 2.

Henniker-Plasma-Treatment-PDMS-bonding-mechanism

Henniker Plasma Treatment of PDMS & Glass for Improved Adhesion

Fig 2. Schematic diagram of the plasma treatment process to improve surface adhesion

Results
Contact Angle Measurements

Contact angle measurements indicate whether a surface is hydrophobic (over 90°) or hydrophilic (under 90°) by the angle a water drop makes with the surface. Here we can see that increasing the time or power of an air plasma treatment on PDMS leads to the surface becoming more hydrophilic.PDMS-Graphs-showing-adhesion-improvement-using-contact-angle

Fig 3. Contact angle variations with increasing treatment time at 25% power (left) and increasing power with 10secs exposures (right). Both show a switch between hydrophobic to hydrophilic behaviour. Insets show example droplets.

This switch to more hydrophilic behaviour shows that the proposed treatment has been a success and that the – OH termination associated with silanol groups is now exposed, leading to improved bonding of the PDMS to the glass substrates.

X-Ray photoelectron spectroscopy (XPS)

XPS is a widely used to technique to analyse the functional groups present on the surface of a substrate. Here we use XPS to show how C-O groups are absent prior to plasma treatment (in this case with oxygen plasma) and present after the treatment. Thus indicating a successful surface modification.

XPS Results PDMS Untreated

XPS Results PDMS Treated

Fig 4. XPS results from untreated (Top) and oxygen treated (Bottom) samples highlighting the presence of C-O groups after treatment.

Conclusions

Bonding of PDMS to glass is a key issue in the use of the material in fabricating microfluidic devices, however when using a Henniker model HPT-200 benchtop plasma system to treat PDMS substrates alongside glass substrates, this problem has been addressed. Plasma treatment has been shown to improve the wettability of both surfaces. Leading to increased bonding between the 2 substrates which is highlighted in Fig 6.

The system can also be optimised to bond PDMS to thermoplastic materials.

 

Microfluidics-being-plasma-treated-in-an-oxygen-plasmaPDMS on the glass substrate after plasma treatment

 

Fig 5. (left) PDMS microfluidic channels undergoing plasma treatment.

Fig 6. (right) Bonded PDMS and glass following a plasma treatment in a Henniker HPT-200 machine.

Acknowledgements
We gratefully acknowledge the input and discussion with Dr. Alex Iles of the Pamme Group at Hull University, UK.

Download the full application note

You can visit our dedicated page on Plasma TReatment of pdms Here

Categorised in: News & Events

Atmospheric Plasma Applicators

Cirrus and Nimbus

The Cirrus and Nimbus atmospheric plasma torches are widely used to increase the surface energy of hard to bond materials, improving the wettability and adhesion characteristics. The compact standalone instruments deliver a continuous plume/s of active plasma gas to the surface and can easily be integrated with assembly/production lines with or without robot handling.

Applicators

The functionality of the Cirrus and Nimbus has been extended by the introduction of three new application specific nozzle attachments. These are user replaceable and can be supplied with a new system order or for retro-fitting to any existing system.

APPLcations include

  • Plastic cards and loyalty cards prior to printing
  • Fabric and textiles pre-treatments
  • Activation of plastic parts prior to gluing
  • Automotive parts prior to painting
  • Ultra-fine cleaning of medical plastics

 

 


Mode

The ‘Mode’ nozzle is standard and
suits 95% of all plasma pre-treatment applications

Plasma Treatment Applicator Mode

 


Finite

Our ‘Finite’ nozzle is best suited to confined areas or where a longer reach is needed,
for example when treating channels or spaces between components.

Plasma Treatment Applicator Finite

 


 Scope

The ‘Scope’ nozzle produces a ‘curtain plume’ suitable for wider
treatment areas and where multiple passes are not practical.

Plasma Treatment Applicator Scope

 


 

Our atmospheric plasma solutions are manufactured in the UK and supplied worldwide where they solve many of the problems associated with poor adhesion caused by low surface energy materials.

See our atmospheric range of products here

 

Categorised in: News & Events

New exclusive distribution partners in Romania, NanoSystems MC

NanoSystems MC - Logo    Romania.png

NANOSYSTEMS MC

We are pleased to introduce our new exclusive distribution partners in Romania, NanoSystems MC.

The team at NanoSystems have a over 10 years experience in providing research equipment and solutions for nanotechnology applications. NanoSystems have contributed to the design and implementation of many unique solutions for their clients and supported their local market by offering complete solutions in imaging, analysis and sample preparation.

NanoSystems MC is a trusted partner for nanotechnology research equipment and is dedicated entirely and exclusively to products for nanotechnology research.  We look forward to working closely with them in the future.

For more information on Nanosystems mc please click here

Categorised in: News & Events

Henniker achieves ISO 9001:2015 Certification

Henniker achieves ISO 9001:2015 Certification

ISO 9001 - Henniker Logo

We are proud to announce that we have achieved UKAS certification to the ISO 9001:2015 standard, UKAS being the only recognised and government-recommended accreditation body in the UK.  The certification confirms that Henniker has developed and operates a system to continuously monitor and improve quality across it’s entire operations, leading to the highest levels of performance and customer satisfaction.

“I consider the award of our ISO 9001:2015 certification to be one of our most important achievements. It not only reflects the commitment to quality displayed by all of the team here but also demonstrates to our much valued customers our willingness to continually learn and improve as we strive to remain at the forefront of innovative UK based manufacturing.”

Terry Whitmore, Managing Director.

 

Categorised in: News & Events

Queens University Belfast

Manesiotis group choose Henniker

Henniker are proud to announce that we have been chosen to supply the latest vacuum plasma systems to Dr. Panagiotis Manesiotis in the Chemistry department at The Queen’s University of Belfast.

Dr. Panagiotis’ group have previously published interesting work in a related area which demonstrated that cold atmospheric plasma was effective in inactivating C. difficile spores.  Our HPT Series vacuum plasma systems will be used to support their ongoing research activities in the chemistry department.

“Henniker provided our team with excellent service during the course of our work together, the plasma system arrived quickly and was installed with ease, giving us visible results from the outset and confirming that we made the right decision in choosing a local UK manufacturer.”

Dr Panagiotis Manesiotis BSc MRSC, Queen’s University Belfast

Categorised in: News & Events