Interactive glass melds together IT and architecture

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Touchscreen displays, LED technology and ultra-thin glasses: The multifunctional diversity of glass in IT and architecture will, in the long term, lead to a combination of both. Buildings, resi-dential houses and public roads will turn into information media and control elements. Buildings will carry information on their façades about the things that take place inside. Road surfaces will automatically respond to and indicate hazards, displaying appropriate signs or notes as well as providing households with electricity. Moreover, where the relevant properties are known, it will be possible to produce glass in thicknesses of 10 mi-crons. Some of the most exciting examples can be found here and at glasstec 2016 in Düsseldorf, the world’s leading trade fair for the glass industry.

Interactivity (Latin: inter (“between”) and agere (“to drive, op-erate”). According to Wikipedia, interactivity concerns “interac-tion with computers and other machines with a user interface”. This implies the exchange of information.

Interactive building envelopes
Glass façades that turn into projection screens, delivering in-teresting information both to the residents inside and passers-by in the street, are no longer visions of the future, but they are technically feasible today. Architects of prestigious buildings no longer see a façade as a design element which conceals some-thing. Rather, they include it the façade in their modelling, giv-ing it an interactive function. In doing so, they let themselves be guided not only by energy efficiency and sustainability, but also by the benefit of glass as part of an IT system. James Law, an architect from Hong Kong, calls this new type of architecture “Cybertecture”. One of his projects which is currently under construction is Parinee I in Mumbai, India – an office centre which, in the future, will primarily be used by creative minds in the Indian film industry. Thanks to LED technology, the finished building will be an advertising medium of everything that is conceived within it. The façade engineering for this unique 160-metre tower block is being provided by the international engineering office Arup. The building has over 3,700 square metres of multimedia displays and LED screens as well as lighting functions. Moreover, areas can be combined to form bigger ones, or they can each display different content, independently of one another. Passers-by do not need invitations, but can share, for instance, in a première celebration that is held inside, enjoying real-time footage of celebrity guests displayed to them on the façade.

Needless to say, the transparent glass also lets the sun into the premises where it is centrally controlled, so that the incidence of light is automatically adjusted to the time of day, and energy consumption and CO2 emissions are kept low.

But this new glass technology should also be of sustain-able benefit to everyday life, not just the world of glamour.

A car park in the United States: Visually, the space reminds us of a beehive. The surface consists of honeycomb-shaped pan-els made from armoured glass with a load-bearing capacity of 1,500 tonnes each. The road markings visibly light up, showing arrows, blocked zones and pedestrian crossings, both day and night. During the darkness the panels show their worth particu-larly clearly, as they contain solar cells, charged by daylight, and now give off energy to the LEDs integrated into the glass. As a result, the road markings remain nicely visible, can change colours to suit the situation and can even flash to indi-cate, for instance, danger spots. The solar modules can also pass on saved energy to the panels in the form of heat, keep-ing the surface free from snow and ice in winter. It may sound surprising, but this car park already exists. It is the test space of Solar Roadways, a project set up by Julie and Scott Brusaw from Idaho (USA). According to the couple, 1 km of road containing Solar Roadways material would be sufficient to supply electric power to 1,000 households. In fact, the enormous load-bearing capacity of this surface would even make it technically suitable as a runway at an air-port. And the resulting electricity could be used to drive electric airport vehicles.
The project is currently moving ahead at a good speed, attract-ing ever-increasing support from the US administration. Also, anyone is welcome to contribute financially through crowdfund-ing.

Clear vision in the car
Less space, yet equally useful: this is a project developed by a team of researchers from the Massachusetts Institute of Tech-nology (MIT) in the United States. The glass reacts to sunlight, automatically produces shade or lights up and transforms the incoming light into electric power. All of this is familiar. What is totally new is that, in the future, car owners without garage space, can sleep 15 minutes longer in winter.

The Bavarian car manufacturer BMW has a major financial stake in the development of a transparent and flexible carrier material that will make it superfluous to scrape ice off the car – a laborious job which can take quite a while. The MIT project in the United States is headed by Prof. Geoffrey Grossman.

According to the team of researchers, the carrier material has a thickness of less than one millimetre. It consists of chemical substances which can absorb energy and then give it off again in response to a defined stimulus which may be electronic, acoustic or tactile.

In the future this material can be used for coating car wind-screens, absorbing and storing daylight and then releasing it again on demand, in the form of heat. Once activated, the glass becomes 10°C warmer than its environment. According to Prof. Grossman, however, the material will be made even more powerful, so that the absorbed energy can even be used to increase the reach of an electric vehicle.

Display glass technology
Everyone has it at their fingertips on a daily basis, whenever they use their smartphone: display glass. In Germany alone it is used by 44 million citizens1 – with an upward trend.

It seems that wherever we go we are continually accompanied by ultra-thin display glass. And of course it needs to be particu-larly impact-proof and scratch-resistant, so that it can withstand normal stress. We also want it to feel good and be easy to clean – and it needs to weigh as little as possible. This is of course a rather difficult balancing act in production.

Nevertheless, glass continues to be an unrivalled material – even though, in the future, we will see more and more services having to occupy fewer and fewer square centimetres of space. It means, of course, that the heat of our devices will rise due to ever more powerful, yet smaller electronic components. The solution to the problem is ultra-thin display glass. Glass is the only material that retains its stability and shape despite rising temperatures.

The secret of thin glass is in the material. The material that has gained ground in the glass industry is aluminium silicate, which is highly resilient and can reduce reflections. It involves the use of float glass that has been chemically prestressed via ion ex-change, with a semiconductor film attached to it, producing a multitouch screen. This gives the glass its optical and capaci-tive properties.

Thin glass – glass off the roll
Things get even more delicate when we look at ongoing devel-opments in ultra-thin glass. Operating under the name KON-FEKT, three major companies in the industry – SCHOTT AG, tesa SE and Von Ardenne GmbH – are currently working on a project developing ultra-thin glass for use in organic electronics and OLED applications. The project is supported by the Ger-man Federal Ministry for Education and Research. The aims are ambitious, researching all the various manufacturing and finishing processes in connection with “glass from the roll”, and indeed in such a way that glass can be used for functions in organic electronics, such as OLED technology. Users particu-larly appreciate the original property, i.e. the protection of sen-sitive componentry from moisture and oxygen.

The underlying process
The German glass manufacturer SCHOTT has developed a so-called down-draw process whereby a glass sheet is drawn down through a cooling section. Accurate process control is applied, reaching the narrowest of manufacturing tolerances, e.g. in the uniformity of thickness of large yet very thin sur-faces. This makes it possible to produce thin glass with a thick-ness of only 25 microns – thinner than a human hair (50 mi-crons). Applications can already be found in biotechnology and sensor applications. The material is available in sheets, wafers and rolls.

It is a very appealing thought to imagine a flexible LED screen that can be applied to any carrier material like a film. This vision should make us curious about the things that are currently coming from Silicon Valley – and indeed from elsewhere.

It is exciting to see what kind of innovations and further devel-opments of such ideas we will be seeing at glasstec 2016 in Düsseldorf from 20 to 23 September. But one thing is certain already: the world’s leading trade fair in the glass industry will feature plenty of things like this. The most outstanding innova-tions will be presented at the symposium called glass technol-ogy live on 21 September, held under the auspices of the VDMA Glass Technology Forum, and at the conference Func-tion Meets Glass with expert discussions on 19 and 20 October 2016.
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1 Digitalverband BITKOM, Berlin, last updated: March 2015

- dbox_JLC__Parinee_Aerial_view.jpg: Parinee Tower is a lighthouse project centring around Indian film production at Bollywood, Mum-bai. (Photo: dbox/Courtesy of James Law Cybertecture Interna-tional)

- dbox_JLC__Parinee_Aerial_view.jpg: The building concept was adapted by James Law to the interests of the Indian film industry. This led to the development of a 160-metre tower block, with state-of-the-art office space for a wide range of companies, mainly from the film industry. (Photo: dbox/Courtesy of James Law Cybertecture International)

- dbox_JLC__Parinee_Aerial_view.jpg: The international façade spe-cialist Arup, which has its business directly next to the Cybertecture office in Hong Kong, is delivering the façade engineering as well as multimedia and lighting consultancy services. (Photo: dbox/Courtesy of James Law Cybertecture International)

- ziwucg_10200_c2_2.jpg: Bandra Ohm is the name of a new building by the architectural office James Law Cybertecture International. It is probably fair to describe the design and lifestyle as a spectacu-lar view of the capital, Mumbai, and as a view where you hover a hundred metres above the world in your own swimming pool. (Photo: courtesy of James Law Cybertecture International)

- ziwucg_10200_c5_0824.jpg, ziwucg_10200_c5_0824.jpg and zi-wucg_10200_c1yj.jpg: Bandra Ohm will be a residential tower block, shaped like the Greek letter omega, inspired by the move-ment of water drops and representing fluidity and the flow of water. The thematic focus will be prominently visible from the outside in the form of special balconies, designed as private swimming pools outside each apartment. Once it is finished, the building will be 140 meters high, with 30 floors and luxury features for a suitably solvent clientèle. (Photos: courtesy of James Law Cybertecture International)

- sr2-glass_b.jpg: Sectional view: various elements of Solar Road-ways (photo: Scott and Julie Brusaw)

- sr2-dog.jpg: The dog likes it, too (photo: Scott and Julie Brusaw)

- sr2-blue-night.jpg: Solar Roadways by night (photo: Scott and Julie Brusaw)

- sr2-scott-tractor.jpg: A sample installation of Solar Roadways was tested by Scott and Julie Brusaw with their tractor right by their own house (photo: Scott and Julie Brusaw)

- solar-roadway-highway-concept.jpg: This is what a country road might look like with Solar Roadways in the future (photo: Scott and Julie Brusaw)

- sr3-concept-sandpoint.jpg: The city is lit up by Solar Roadways road markings, which also draw attention to hazards, e.g. pedestrians (photo: Scott and Julie Brusaw)

- sr3-led-daylight.jpg: Example of a combination of different solar elements (photo: Scott and Julie Brusaw)

- Sheared hybrid film.jpg: Sheared hybrid film, clearly showing all three layers. Bottom layer: the silicon substrate (photo: Center for Materials Science & Engineering (CMSE)/Massachusetts Institute of Technology (MIT), published in an article entitled “Solid-State Solar Thermal Fuels for Heat Release Applications” in the magazine Advanced Energy Materials(2015)

- Bild_UTG_1.jpg: Flexible glass, thinner than a human hair, will open up a wide range of opportunities for the electronics and semiconductor industries. The technology group SCHOTT is one of the few global manufacturers that can make reliable ultra-thin glass in thicknesses between 25 and 100 microns. Laboratories at SCHOTT are even working on 10-micron glass now. Innovative applications of such ultra-thin glass range from chip packaging, through touchscreen sensors and thin film batteries to glass for flexible smartphones. (Photo: SCHOTT)

- Bild_UTG_2.jpg: Depending on a customer’s requirements, SCHOTT can deliver ultra-thin glass either in sheets or wafers (photo). All glasses involve the use of AF 32® eco non-alkaline aluminium silicate glass or D 263® eco low-alkali borosilicate glass, both manufactured under highly eco-friendly conditions. (Photo: SCHOTT)

- Bild_UTG_5.jpg: SCHOTT makes ultra-thin glasses, using a so-called down-draw process, where the glass is continually drawn down directly from the melter through a nozzle, forming a glass rib-bon. This ribbon is then coiled up onto rolls for further processing. (Photo: SCHOTT)

- Bild_UTG_7.jpg: When processed further, the ultra-thin glass ribbon is uncoiled from the roll in a special cutting machine and then undergoes processing at the edges and borders. (Photo: SCHOTT)

- Bild_UTG_8.jpg: SCHOTT researchers are particularly interested in the firmness of ultra-thin glass. This involves complex testing, for instance in a two-point bending test (photo). (Photo: SCHOTT)

- Grafik_Smartphone_1.jpg: Ultra-thin glass from SCHOTT will have a number of important functions in the smartphone of the future: as tempered cover glass in a flexible OLED display, camera or finger-print sensor, as a substrate in a thin film battery and as a formally and dimensionally stable component in a processor (see further isometrics). (Chart: SCHOTT)

The photos for this article can be found on the following website: >Press > Services for journalists > Press material > article (navigation on left). Each article can be downloaded as a zip file.

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