Temperature-responsive permeability of porous PNIPAAm-g-PE membranes

Peng, Tao; Cheng, Yu-Ling

doi:10.1002/(sici)1097-4628(19981212)70:11<2133::aid-app6>3.0.co;2-p

Cited by 116 publications

(71 citation statements)

References 23 publications

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“…These polymers undergo reversible phase transitions involving mainly changes in their solubility. They can be combined in different ways in order to produce devices that can, among other possibilities, display wettability changes in the surface, [4] hydrogels switching their swelling capability, [5] systems exhibiting sol-gel transition, [6] membranes exhibiting changes in permeability to molecules [7,8] or colloidal particles that exchange their aggregation status. [9] This review will explore progresses made on responsive polymer-based systems in the form of crosslinked or physical gels and covalently linked onto surfaces.…”

Section: Introductionmentioning

confidence: 99%

Stimuli‐Responsive Polymeric Systems for Biomedical Applications

2008

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Smart polymeric‐based devices and surfaces that reversibly alter their physico‐chemical characteristics in response to their environment are the center of many studies related to the development of materials and concepts in a broad‐range of biomedical fields. Although the initial interests were more focused in systems for the delivery of therapeutic molecules, other applications have been raised in topics ranging from actuators to biomaterials for tissue engineering and regenerative medicine. The general aspects of the different types of stimuli that can be used to modulate the response are reviewed mainly for the case of hydrogels and surfaces, based on natural‐origin or biodegradable macromolecules. Thermosensitive or light responsive surfaces that can modulate cell adhesion or protein adsorption are addressed as well as less conventional smart surfaces, such as substrates onto which biomineralization may be triggered. Injectable liquids that turn to gels by the action of heating (sol‐gel thermo‐reversible hydrogels) or by changing pH or the ionic milieu (bioinspired self‐assembling systems) may find great applicability as temporary scaffolds in non invasive procedures to deliver drugs or cells to particular places in the body. Examples of systems that recognize independently or simultaneously more than one stimulus will also be presented. Besides the typical response to temperature and pH, recent developments on materials that react to biochemical stimuli, including specific enzymes, antibodies or cells, are also highlighted.

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Section: Introductionmentioning

confidence: 99%

Stimuli‐Responsive Polymeric Systems for Biomedical Applications

2008

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“…Graft polymerization of N-isopropyl acrylamide on the membrane surface can be achieved by different techniques such as UV irradiation, plasma treatment, γ-ray, ozone treatment and chemical reaction [10][11][12]. These techniques have also been used for the fabrication of poly (N-isopropyl acrylamide) grafted chains on various substrates including polymer membranes.…”

Section: Pnipaam Modified Membrane: Interesting Studiesmentioning

confidence: 99%

Polymer Thermo-Responsive Gate Membranes

Sujith¹

2017

MOJPS

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“…These movable membranes are further coupled to magnetic, piezoelectric or pressure actuated methods which allow external switching. Some examples of mechanical actuators include permeable membranes (Hautojarvi et al, 1996;Kontturi et al, 1996;Ulbricht, 1996;Peng and Cheng, 1998;Peng and Cheng, 1999;Peng and Cheng, 2001;Chu et al, 2003;Gatimu et al, 2006), and nanofabricated reservoirs that act as constant sources of reagents (Groisman et al, 2005;Frevert et al, 2006;Keenan et al, 2006).…”

Section: Types Of Actuators That Control Flowmentioning

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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Temperature-responsive permeability of porous PNIPAAm-g-PE membranes

Cited by 116 publications

References 23 publications

Stimuli‐Responsive Polymeric Systems for Biomedical Applications

Stimuli‐Responsive Polymeric Systems for Biomedical Applications

Polymer Thermo-Responsive Gate Membranes

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

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