Rewritable Microrelief Formation on Photoresponsive Hydrogel Layers

Szilágyi, András; Sumaru, Kimio; Sugiura, Shinji; Takagi, Toshiyuki; Shinbo, Toshio; Zrı́nyi, Miklós; Kanamori, Toshiyuki

doi:10.1021/cm070444v

Cited by 97 publications

(125 citation statements)

References 22 publications

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“…Figure 1a shows a PMMA mould with reservoirs of 1 × 5 mm and 500 μm depth where the different ionogels were polymerised for actuation study using contact profilometer measurements and Figure 1b presents the chemical structure of the ionic liquids used in this study. The acrylated benzospiropyran is synthesised as described elsewhere [26]. trihexyltetradecylphosphonium based ionic liquid chemical structures.…”

Section: Preparation Of Photo-responsive Phosphonium Based Ionogelsmentioning

confidence: 99%

Ionogel-based light-actuated valves for controlling liquid flow in micro-fluidic manifolds

et al. 2010

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We present the fabrication, characterisation and performance of four novel ionic liquid polymer gels (ionogels) as photo-actuated valves incorporated into microfluidic manifolds. The ionogels incorporate benzospiropyran units and phosphonium based ionic liquids. Each ionogel is photo-polymerised in-situ in the channels of a poly(methyl methacrylate) micro-fluidic device, generating a manifold incorporating four different micro-valves. The valves are actuated by simply applying localised white light irradiation, meaning that no physical contact between the actuation impulse (light) and the valve structure is required. Through variation of the composition of the ionogels, each of the micro-valves can be tuned to open at different times under similar illumination conditions. Therefore, flows through the manifold can be independently controlled by a single light source. At present, the contraction process to open the channel is relatively rapid (seconds) while the recovery (expansion) process to re-close the channel is relatively slow (minutes), meaning that the valve, in its current form, is better suited for single-actuation events.

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Section: Preparation Of Photo-responsive Phosphonium Based Ionogelsmentioning

confidence: 99%

Ionogel-based light-actuated valves for controlling liquid flow in micro-fluidic manifolds

et al. 2010

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“…3) Other polymers with bulk-triggered sensitivities to a wide range of physical stimuli such as pressure and applied voltage (Shoenfeld and Grodzinsky, 1980;Zheng et al, 2008). 4) The locally triggered materials that respond to light (Kungwatchakun and Irie, 1988;Irie and Kungwatchakun, 1992;Nayak and Lyon, 2004;Radt et al, 2004;Jiang et al, 2006;Slocik et al, 2007;Szilagyi et al, 2007). 5) And lastly, the hybrid materials, which are materials that have been coupled to or modified with specific functional chemical groups and, therefore, exhibit combinatory responses.…”

Section: Classification Of "Intelligent" Materialsmentioning

confidence: 99%

Environmentally responsive polymeric "intelligent" materials: the ideal components of non-mechanical valves that control flow in microfluidic systems

Morones‐Ramírez¹

2010

Braz. J. Chem. Eng.

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-Miniaturization and commercialization of integrated microfluidic systems has had great success with the development of a wide variety of techniques in microfabrication, since they allowed their construction at a low cost and by following simple step-series procedures. However, one of the major challenges in the design of microfluidic systems is to achieve control of flow and delivery of different chemical reagents. This feature is especially important when using microfluidic systems in the development of cell culture systems, the construction of labs on a chip and the fabrication and design of chemical microreactors. Spatiotemporal control of the microenvironment in microfluidic devices has been only partially achieved by incorporating actuator parts (mechanical and non-mechanical) within these devices; nevertheless, recently there has been enormous progress due to advances in the materials sciences, and the development of novel polymeric "intelligent" materials. These materials have proved to be excellent candidates in the construction of non-mechanical actuators in the form of environmentally responsive valves. These valves can more efficiently control flows because these "intelligent" materials are capable of undergoing conformational changes and phase transitions in response to different local or external environmental stimuli; allowing them to turn the valves from "on" to "off". In addition, these valves have very simple designs, and are easy and cheap to incorporate into microfluidic systems. Therefore, although there are many reviews that focus on the development and design of non-mechanical actuators, the following review proceeds to describe the exciting characteristics, potential uses and synthesis methods of the building blocks of the most recent and innovative non-mechanical valves, environmentally responsive polymeric "intelligent" materials. In addition, the last section of this review will focus on the synthesis of composite materials that are capable of responding to more than one type of stimulus, since these materials are believed to be the future components that will boost the development of microfluidic systems with spatiotemporal controlled microenvironments.

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“…The acrylated benzospiropyran is synthesised as described elsewhere [6]. A reaction mixture solution placed in the micro-fluidic reservoir was prepared by dissolving the NIPAAm monomer (452 mg, 4.0 mmol), the MBAAm (10.8 mg, 0.07 mmol), acrylated spirobenzopyran monomer (14.0 mg, 0.04 mmol), and the photo-initiator dimethoxy-phenylacetophenone (DMPA) (10.2 mg, 0.04 mmol) into 1-buthanol (1.0 mL).…”

Section: Preparation Of Photo-responsive Phosphonium Based Ionogelmentioning

confidence: 99%

“…These monomers were photo-polymerised within an ionic liquid matrix. For this example, the ionic liquid matrix used was trihexyltetradecylphosphonium dicyanoamide [P 6,6,6,14 ][dca]. UV irradiation source for polymerization (365 nm) was placed 8 cm far from the monomers.…”

Section: Preparation Of Photo-responsive Phosphonium Based Ionogelmentioning

confidence: 99%

“…This is due to the complex fabrication schemes required to incorporate these materials into microfluidic manifolds. Therefore, controlling physical properties with temperature, [6,30] photon irradiation, [31,32] or specific chemical (pH, ionic strength) [33,34] stimulii would be of great benefit for rapid prototyping.…”

Section: Chemical Sensing Utilizing Bead Technologymentioning

confidence: 99%

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Schizophrenic Molecules and Materials with Multiple Personalities - How Materials Science could Revolutionise How we do Chemical Sensing

Byrne¹,

Scarmagnani

Radu³

et al. 2009

MRS Proc.

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Molecular photoswitches like spiropyrans derivatives offer exciting possibilities for the development of analytical platforms incorporating photo-responsive materials for functions such as light-activated guest uptake and release and optical reporting on status (passive form, free active form, guest bound to active form). In particular, these switchable materials hold tremendous promise for microflow-systems, in view of the fact that their behaviour can be controlled and interrogated remotely using light from LEDs, without the need for direct physical contact. We demonstrate the immobilisation of these materials on microbeads which can be incorporated into a microflow system to facilitate photoswitchable guest uptake and release. We also introduce novel hybrid materials based on spiropyrans derivatives grafted onto a polymer backbone which, in the presence of an ionic liquid, produces a gel-like material capable of significant photoactuation behaviour. We demonstrate how this material can be incorporated into microfluidic platforms to produce valve-like structures capable of controlling liquid movement using light.

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Rewritable Microrelief Formation on Photoresponsive Hydrogel Layers

Cited by 97 publications

References 22 publications

Ionogel-based light-actuated valves for controlling liquid flow in micro-fluidic manifolds

Ionogel-based light-actuated valves for controlling liquid flow in micro-fluidic manifolds

Environmentally responsive polymeric "intelligent" materials: the ideal components of non-mechanical valves that control flow in microfluidic systems

Schizophrenic Molecules and Materials with Multiple Personalities - How Materials Science could Revolutionise How we do Chemical Sensing

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