Pneumatically Adaptive Light Modulation System (PALMS)
This research introduces a novel approach to control light transmittance based on ﬂexible polydimethylsiloxane (PDMS) ﬁlms that have been plasma-treated such that micro-scale surface features have a visual effect as the ﬁlm responds to the applied strain. The effect is continuously tunable from optically clear (71.5% Transmittance over a 400–900 nm wavelength) to completely diffuse (18.1% T). Changes in the ﬁlm’s optical properties are triggered by bi-axial strains applied using a pneumatic system to form pressurized envelopes. This reseach explores a series of experimental studies and provides system integration research using prototypes, simulations and geometric models to correlate measured optical properties, strain, and global surface curvatures. In conclusion, a design is proposed to integrate PDMS light control within existing building envelopes. Two alternatives are investigated and compared: System A uses positive pressure featuring an exterior grid to restrain and shape the inﬂated ﬁlm during expansion; System B uses negative pressure where the ﬁlms are shaped according to the geometry of an interstitial grid that serves as a spacer between two ﬁlm surfaces. Both systems can provide effective control of opacity levels using pneumatic pressure and may be suitable for use with existing glazing systems or ethylene tetraﬂuoroethylene (ETFE) pneumatic envelopes.
- Harvard Wyss Institute & Harvard Graduate School of Design
- Martin Bechthold (Harvard GSD), Joanna Aizenberg (Wyss Institute), Philseok Kim (Wyss Institute), Jack Alvarenga (Wyss Institute), and Kevin Hinz (Harvard GSD)
- K. Hinz, J. Alvarenga, J. Aizenberg, M. Bechthold, P. Kim, D. Park. 2018. “Pneumatically Adaptive Light Modulation System (PALMS) for Buildings.” Materials & Design, Volume 152. PROJECT DESCRIPTION