Monodisperse silica particles with average diameters of 190, 197, 204, 224 nm, 228 nm, and 240 nm (Sukgyung AT) were washed with ethanol several times and then dried to measure the weight. The silica powders were redispersed in ethanol (99.5%, Merck) using sonication overnight, and the ethanolic dispersions were combined with ethoxylated trimethylolpropane triacrylate (ETPTA, Mn ~428 g mol−1, Sigma‒Aldrich) containing 1 w/w% photoinitiator (Darocur 1173, Sigma‒Aldrich). The amounts of ETPTA were adjusted to achieve volume fractions of silica particles at 0.3, 0.4, and 0.5 in the ethanol-free base, and the densities of silica particles and ETPTA were 2.0 and 1.11 g/cm3, respectively. The mixture was sonicated for 10 min and then kept in a convection oven at 70 °C overnight to completely evaporate the ethanol. The resulting dispersions were defoamed and mixed using a planetary centrifugal mixer (AR-310, Thinky).
Etpta
Manufactured by Merck Group
ETPTA is a laboratory equipment product manufactured by Merck Group. It is used for the synthesis and purification of various organic compounds. ETPTA functions as a versatile reagent in chemical reactions and processes.
Automatically generated - may contain errors
Lab products found in correlation
Ethanol, by Merck Group (1 mentions)
Darocur 1173, by Merck Group (1 mentions)
Ar 310, by Thinky (1 mentions)
Ethanol, by Sinopharm (1 mentions)
2 hydroxy 2 methylpropiophenone, by Merck Group (1 mentions)
Aqueous ammonia, by Sinopharm (1 mentions)
Tetraethyl orthosilicate, by Sinopharm (1 mentions)
Pegda, by Merck Group (1 mentions)
Propylene glycol monomethyl ether acetate, by Merck Group (1 mentions)
Irgacure 2100, by BASF (1 mentions)
Su 8 10, by MicroChem (1 mentions)
Uvgl 58, by Analytik Jena (1 mentions)
4 protocols using etpta
1
Fabrication of Silica-ETPTA Composites
2
Synthesis of Silica Nanoparticles
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Silica particles (in ethanol, PDI < 0.03, ζ‐potential: −45 mV), tetraethyl orthosilicate (98%), ethanol (EtOH, 99%), and aqueous ammonia (28%) were purchased from Sinopharm Chemical Reagent Co. Ltd. ETPTA and 2‐hydroxy‐2‐methylpropiophenone (photo‐initiator, 96%) was obtained from Sigma‐Aldrich. Polyvinylpyrrolidone (PVP, Mw: 40 000), thioacetamide (TAA), and Zn(NO3)2 were purchased from Aladdin. All the chemicals were used as received without further purifications.
3
Spatially-Controlled Photopolymerization for 3D Microstructures
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For the bottom-to-top growth, the epoxy-based photopolymer SU-8 10 (Microchem) was spin coated to be 30 μm thick on the growth-guiding pattern and baked for complete evaporation of residual solvents. Ultraviolet light with an intensity of 14 mW cm−2 s−1 was then illuminated onto the SU-8 film through the growth-guiding patterns. Subsequently, the SU-8 was baked at 95 °C and the unpolymerized parts were washed out with propylene glycol monomethyl ether acetate (Sigma-Aldrich). For the centre-to-side growth, either PEGDA (Mn 575 g mol−1, Sigma-Aldrich) or ETPTA (Mn 428 g mol−1, Sigma-Aldrich) containing 5% w/w of Irgacure 2100 (BASF) as a photoinitiator was infiltrated into a gap between the growth-guiding pattern and slide glass, where the gap thickness was controlled by spacers of PDMS film; the thickness was varied from 15 to 110 μm. After ultraviolet irradiation through the growth-guiding patterns, unreacted prepolymers were washed out with ethanol. For the bottom-centre-to-top-edge growth, a 10-μm-thick PDMS film was coated on the glass slide and then the procedures used for the centre-to-side growth were followed.
4
Fabrication of Magnetic Microparticle Arrays
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Once the elastomeric mold was manufactured, the wells of the PDMS were filled with a magnetic suspension. First, a small amount of photoinitiator 2-hydroxy-2-mehtyl-1-phenyl-propan-1one was mixed with ethoxylated trimethylolpropane triacrylate (ETPTA) (10 : 1 w/w ETPTA : photoinitiator, Sigma-Aldrich). The densities of the photoinitiator and ETPTA were 1.077 g mL À1 and 1.11 g mL À1 , respectively. Next, carbonyl iron (CI) particles (density 7.86 g mL À1 , grade EW BASF SE, Germany) at a volume fraction of 50 vol% were mechanically dispersed in the mixture using a centrifugal mixer. Then, the CI suspensions were spread over the PDMS mold with a spoon spatula. Most of the excess suspension was removed by scraping off the surface of the mold with a razor blade. Next, the mold was pressed gently onto a glass slide several times in order to completely clean the excess material. Afterwards, the filled PDMS wells were degassed for 5 minutes and reticulated for 4 hours under a UV-lamp (UVGL-58, UVP, UK) with wavelength of 254 nm and power of 6 Watt. Finally, the mold was rinsed with ethanol and then a stream of air was used to dry the surface.
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