Hydrophilization and hydrophobic recovery ofpdms by oxygen. Hydrophobic recovery of plasmatreated polydimethylsiloxane. Hydrophilization and hydrophobic recovery of pdms by oxygen. Pdms generated a hydrophobichydrophilic pattern mixture surface, which offers great potential in the tissue. Effects of embedded surfactants on the surface properties of.
This issue has spawned a flurry of research to devise longer lasting surface modifications. Based on the procedures done by sharvari nadkarni, developed with the help of loling song work as much as possible in clean environment, under the flow hood. Apart from oxygen plasma and uvozone treatments, hydrophilicity and surface silanol groups of pdms surface can also be obtained by using a solgel method which created an oxide layer on the. Temporary wettability tuning of pclpdms micro pattern using. Khanmalek, hydrophilization and hydrophobic recovery of pdms by. Hydrophilization of liquid surfaces by plasma treatment. The major disadvantage to using pdms for these applications is its hydrophobic properties. Hydrophilic microchannels are sometimes advantageous over hydrophobic microchannels due to increased cell adhesion or increase in electro osmotic flow eof.
Pdms is an easy and robust approach, and the simplicity of. After a certain incubation time or dose of energetic species a glassy. The hydrophobic nature of pdms, however, limits its applicability for microchip ce, microfluidic patterning, and other nonelectrophoresis. Hiroki mitsui, ken mukai, satoshi ikubo, toyoko suzuki, hideto minami. Surface modification of rtv 615 pdms was carried out by oxygen plasma treatment and hemagrafting. Contribution of surface energy and roughness to the. Figure 1 compares hydrophilic ink imprints, which have been created using untreated, oxygen plasma treated and kit modified pdms. The current methods that enhance the hydrophilicity of elastomers used for micro and nanofluidic applications are intricate and costinefficient. Plasma was used to activate the pdms surface and sequentially promote the. Hyeon shin department of materials science and engineering, korea university, anam. However, the rapid hydrophobic recovery will achieved after washing with deionized water and the thermal treatment of the surfaces.
In collaboration with clemson university and the pennsylvania state university, we have developed a surface modification kit, which allows for durable hydrophilization of various polydimethylsiloxane pdms surfaces. Initially after the treatment, the samples showed a low surface hydrophobicity but upon storage in dry air, a continuous increase in hydrophobicity was observed. It employs a macromolecular anchoring layer approach for grafting hydrophilic polymer layers onto hydrophobic pdms surfaces. Investigation of diffusion characteristics through. One of the possible applications for hydrophilic pdms surfaces is microcontact printing. Pdms plant design management system as it is known in the 3d cad industry, is a customizable, multiuser and multidiscipline, engineer controlled design software package for engineering, design and construction projects in offshore and onshore. Microfluidic design and patterning collagen scaffold. Pdms nanoparticle coatings which exhibit water repellency have been reported to impart superhydrophobicity to monument surfaces using common and costeffective materials 21. Consequently, the hydrophobic recovery behavior of the plasmatreated pdms molds may be suitable for the fabrication of ceramic microparts by soft lithography. Hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatment.
Hydrophilization of siliconeurea copolymer surfaces by uv. Uvozone modification of polydimethylsiloxane microfluidics channels. Recent developments in pdms surface modification for. Pdms as well as on silica coated pdms surfaces, although the process is slower and less homogeneous in the case of prolonged oxidation times. Rapid prototyping of polydimethylsiloxane pdms is frequently used to build microfluidic devices. Thermoplastic elastomer with advanced hydrophilization and. Hydrophobic recovery of pdms upon storage after exposure to plasma and corona discharges has been studied by contact angle measurements. In case of a 6 min sf 6 treated pdms surface, after o 2 plasma treatment and rapid hydrophobic recovery by the postprocess with deionized water and baking, a contact angle of 93 is determined. Jul 14, 2017 sterilization by boiling had a tendency to stiffen samples cured at lower temperatures whereas uv and ethanol did not alter the material properties. To understand the hydrophilization and hydrophobic recovery of pdms by these two modification techniques, sem images were recorded. To avoid hydrophobic recovery, the hydrophilized surface must undergo. However, a near universal observation is a hydrophobic recovery that partially or completely negates the effect of the plasma hydrophilization over time owen and smith 1994. However, pdms s hydrophobicity and fast hydrophobic recovery after surface hydrophilization, attributed to its low glass transition temperature of less than.
Initially after the treatment, the samples showed a low surface hydrophobicity but upon storage in dry air, a continuous increase in hydrophobicity. By comparing the cultured 3t3 fibroblast cells on the treated pcl1 hydrophobic and pdms0 hydrophilic surfaces, pdms0 performed better cell attachment after 48 h of culturing time compared to pcl1. Plasmabased surface modification of polydimethylsiloxane for. Polydimethylsiloxane pdms is inherently hydrophobic. The studied processes were oxygen plasma activation for vapor phase silanization and plasma polymerization with tetrafluoromethanehydrogen mixtures under different processing conditions. Longterm retention of hydrophilic behavior of plasma. Is the pdms software course useful for mechanical engineering. Network accelerates innovation by allowing you to discover and connect to gamechanging technologies and technology professionals on the worlds most comprehensive technology network. On the one hand, normal plasma treated surfaces undergo hydrophobic recovery within minutes 14 after bonding and thermal treatment. Biofunctionalization of pdmsbased microfluidic systems. It is seen that these times are on the order of magnitude of 460 minutes. Hydrophilization of polydimethylsiloxaneurea copolymer psu surfaces and the extent of hydrophobic recovery were investigated as a function of.
Additionally, enhanced alcohol recovery was achieved by incorporating zif71 as the filler material in mixed matrix membranes mmms 1,16,25. Hydrophilization and hydrophobic recovery of pdms by. Hydrophilic surface modification of pdms for droplet. Minimizing residues and strain in 2d materials transferred. The solgel coating makes the channels hydrophobic, which is useful for fabricating devices that make water in oil droplets while the hydrophillic monomer coating is useful for oil in water emulsion devices.
Hydrophilic peopdms for microfluidic applications iopscience. Apart from oxygen plasma and uvozone treatments, hydrophilicity and surface silanol groups of pdms surface can also be obtained by using a solgel method which created an oxide layer on the pdms channel wall. The computeraided design centre or cadcentre as it was more. The procedure is based on technology developed by the group of professor i. Owen and smith 27 reported on the formation of cracks in this surface silicalike layer and argued that these cracks allowed for the migration of lowmolecularweight uncrosslinked pdms fragments to the surface socalled hydrophobic recovery. Temporary wettability tuning of pclpdms micro pattern. Pdf oxygen plasma treatments of polydimethylsiloxane surfaces. Effect of manufacturing and experimental conditions on the. International audiencerapid prototyping of polydimethylsiloxane pdms is frequently used to build microfluidic devices. No noticeable hydrophobic recovery was observed for at least 7 days of storage in air, as evidenced with xray photoelectron spectroscopy xps studies. Influence of pdms molecular weight on surface oxidation and hydrophobic recovery article in polymer 5425. Hydrophilization using sulphuric acid allowed to decrease surface hydrophobicity, however this effect was lost over time as hydrophobic recovery occurred. However, pdmss hydrophobicity and fast hydrophobic recovery after surface hydrophilization, attributed to its low glass transition temperature of less than 120.
Hydrophilic surface modification of pdms for droplet microfluidics. Apr, 2017 bodas d, khanmalek c 2007 hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatmentan sem investigation. Completely superhydrophobic pdms surfaces for micro uidics. Plasma hydrophilization and subsequent hydrophobic recovery are studied for ten different polymers of microfabrication interest. Yongqiang lan, a,b ning yan, b,c, and weihong wang a, a new type of biocharsio 2 coreshell particles bcnps was successfully prepared via the solgelsediment method.
Hydrophilization and hydrophobic recoverypdms sheets. Scalable microphysiological system to model threedimensional. Mar 20, 2014 polydimethylsiloxane pdms is commonly used for fabricating micro and nanofluidic devices due to its low cost and ease of fabrication. Pdms nanocomposite coatings filled with hydrophobic.
Aug 04, 2016 piping systems are like arteries and veins. We present and compare two processes for plasmabased surface modification of polydimethylsiloxane pdms to achieve the antisticking behavior needed for pdms pdms molding. Hydrophobic recovery of polydimethylsiloxane elastomer. The popularity of this material is the result of its low cost, simple fabrication, and rugged elastomeric properties. Effect of zif71 ligandexchange surface modification on.
Uncured pdms inhibits myosin in vitro motility in a. On the other hand, a hydrophobic surface of the pdms mold with low surface energy is beneficial for achieving highquality microparts during the demolding process. One wellestablished approach to produce hydrophilic pdms surfaces is. The contact angle of the samples stored in different temperatures separates. Owing to the hydrophobic nature of the framework, zif71 demonstrated promising alcohol e. Longterm hydrophilization of polydimethylsiloxane pdms for capillary filling microfluidic chips. Pdms dg was employed to create linking between ha and pdms. In order to understand the surface hydrophilization process of pdms with uvozone and the subsequent hydrophobic recovery process, we extend the model developed by kim and coworkers to describe. Oxygen and nitrogen plasma hydrophilization and hydrophobic. Oxygen and nitrogen plasma hydrophilization and hydrophobic recovery of polymers. Hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatment an sem investigation.
Deepdyve is the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Pdf oxygen and nitrogen plasma hydrophilization and. Chemical force microscopy cfm in water was used to map the surface hydrophobicity of uvozonetreated polydimethylsiloxane pdms. Polydimethylsiloxane pdms has become one of the most widely used materials for microchip capillary electrophoresis and microfluidics. Polydimethylsiloxane pdms membrane filled with biochar core. Storing pdms samples, immediately after plasma treatment, under water and luriabertani broth lb broth, a common growth medium for bacteria, retards hydrophobic recovery considerably. Oxygen plasma treatment is a nontoxic, low cost method to render pdms hydrophilic. The contact angle of the samples stored in different temperatures separates clearly into three distinct trajectories over the span of 100 days. Investigation of diffusion characteristics through microfluidic channels for passive drug delivery applications. Request pdf hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatmentan sem investigation rapid prototyping of polydimethylsiloxane pdms is frequently used. Bodas d and khanmalek c 2007 hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatment an sem investigation sensors actuators b 123 36873. Polydimethyl siloxane surface modification by low pressure plasma.
This treatment did not alter the surface topography, as it was verified by afm measurements. Hydrophilization and hydrophobic recovery of pdms by oxygen plasma and. Preparation of hydrophobic transparent paper via using. Water contact data shows that hemagrafted pdms has a greater hydrophilic stability than oxygen plasma treated pdms. Oxygen plasma treatment for reducing hydrophobicity of a. Generation of hydrophilic polydimethylsiloxane for high. Pdmsglass hybrid microfluidic flow cell was tested under a variety of. The modified pdms might not be ensured a conformal coating and longterm stability, and slowly recovery to hydrophobic might happen after a period of time of treatment. Modeling hydrophobic recovery of electrically discharged. In a modern city they transport water from the sources of water supply to the points of distribution. Recent developments in pdms surface modification for microfluidic. Temperaturedependent formulation of a hydrogel based on. Deepdyve is the easiest way to get instant access to the academic journals you need.
Hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatmentan sem investigation. Khanmalek, hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatmentan sem investigation. Pdms develops a number of enterprise software products which are in use around the world. Completely superhydrophobic pdms surfaces for micro. Hydrophilization and hydrophobic recovery of pdms by oxygen plasma and chemical treatmentan sem investigation rapid prototyping of polydimethylsiloxane pdms is frequently used to build microfluidic devices. The results showed that silica nanoparticles produced by the teos hydrolysis improved the paper transparency to some extent, increased the paper thermal stability, but still remained the hydrophilicity of paper. Owen and coworkers explained this hydrophobicity recovery as being the result. Pdms maris is used by five international ship registries, to help improve productivity and customer service. Selecting this option will search all publications across the scitation platform selecting this option will search all publications for the publishersociety in context. Superhydrophilic pdms microchannels show the highest spontaneous capillary flow in the channels while the hydrophilic. Polydimethylsiloxane pdms membrane filled with biochar coreshell particles for removing ethanol from water. Currently, the surface modified pdms after hydrophilization has been used in applications, such as biomolecule separations, enzyme microreactors, immunoassays and cell culture studies.
It seems plausible to relate the pronounced hydrophilization of pdms oils at least partially to the reorientation of hydrophilic groups of pdms towards the. Surface modification of sylgard184 polydimethyl siloxane. The plasma hydrophilization and hydrophobic recovery have been studied for many polymers, in both mechanistic and application oriented studies. Yet, to compete with distillation separation, zif71 membranes. Soft lithography of ceramic microparts using wettability. As the epoxide rings were opened in pdms dg, they formed ether bonds with the hydroxyl groups of ha. The gcloud is the uk governments programme to adopt cloud based services and pdms provide a range of software as service solutions and services on the gcloud framework. Functionalized glass coating for pdms microfluidic devices. However, the hydrophilization is typically not stable, and either a partial or complete hydrophobic recovery is. Modification of hydroxylated pdms surface by coating a hydrophilic polymer. Effect of surface nanostructuring of pdms on wetting. On the other hand, extended plasma treatment induces undesirable surface cracks which a. Longterm hydrophilization of polydimethylsiloxane pdms. Pdms context modules can be purchased via the uk governments gcloud on the digital market place.
Hydrophilic microchannels are sometimes advantageous over hydrophobic microchannels due to increased cell adhesion or increase in electro osmotic flow eof leading to ease of liquid filling in microchannels. Pdms samples stored in lb broth retain hydrophilic. Since the reorientation of polar groups can be ruled out in our case and the recovery process is slowed down at high vacuum, the lmw species created by partial discharge must play a major role on the hydrophobic recovery of the oxidized pdms elastomers. After the paper was further coated with the pdms and the pdms was consolidated, the paper became clearly transparent and hydrophobic. The resulting rate of hydrophobic recovery of plasmaexposed pdms sheets stored at three different temperatures from the onset of hydrophilization up to 100 days for both the advancing and receding contact angles is shown, respectively in fig. Pdms nanocomposite coatings with sh property have been developed by several researcher 21, 22. It was assumed that in the alkaline condition ph 10, the deprotonated hydroxyl groups of ha are more nucleophilic than the carboxyl groups and prefer to react with the pdms epoxide. The characteristics of bcnps were investigated using scanning. Hydrophilization of siliconeurea copolymer surfaces by uvozone. Maris has been designed to manage all the key business functions of a ship registry or marine administration including vessel registration, surveys. Significant differences in recovery rates are also evident between different plasma gases. However, while these studies have greatly illuminated the fundamental physics and chemistry of plasma treatments, as well as provided valuable applications for plasma treatments, comparisons between. High resolution micropatterning of stretchable polymer. This option allows users to search by publication, volume and page selecting this option will search the current publication in context.