Design of Reversible Cross-Linkers for Step and Flash Imprint Lithography Imprint Resists

Palmieri, Frank L.; Adams, Jacob R.; Long, Brian K.; Heath, William H.; Tsiartas, Pavlos C.; Willson, C. Grant

doi:10.1021/nn7001079

Cited by 40 publications

(35 citation statements)

References 17 publications

(39 reference statements)

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“…Several cross-linkers derived from HEA had been considered ( 4 – 7 ; Figure 1b),and each of them could result in minimally swollen particles after the PRINT process. We opted for 7 , an acetal diacrylate (ADA), 34−36 because the cross-linked particles could: 1) degrade quickly at pH = 3 to swell to the desired size (<3 h, compared to >24 h for 5 and >5 d for 6 ), shortening workup time; 2) stay minimally swollen without premature swelling (no obvious swelling in 3 d compared to Q = 4.1 after 6 h for 4 ) in phosphate buffered saline (PBS, pH = 7.4) for storage before further reactions were carried out.…”

Section: Resultsmentioning

confidence: 99%

Design of Asymmetric Particles Containing a Charged Interior and a Neutral Surface Charge: Comparative Study on in Vivo Circulation of Polyelectrolyte Microgels

Chen¹,

Xu²,

Luft³

et al. 2014

J. Am. Chem. Soc.

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Lowering the modulus of hydrogel particles could enable them to bypass in vivo physical barriers that would otherwise filter particles with similar size but higher modulus. Incorporation of electrolyte moieties into the polymer network of hydrogel particles to increase the swelling ratio is a straightforward and quite efficient way to decrease the modulus. In addition, charged groups in hydrogel particles can also help secure cargoes. However, the distribution of charged groups on the surface of a particle can accelerate the clearance of particles. Herein, we developed a method to synthesize highly swollen microgels of precise size with near-neutral surface charge while retaining interior charged groups. A strategy was employed to enable a particle to be highly cross-linked with very small mesh size, and subsequently PEGylated to quench the exterior amines only without affecting the internal amines. Acidic degradation of the cross-linker allows for swelling of the particles to microgels with a desired size and deformability. The microgels fabricated demonstrated extended circulation in vivo compared to their counterparts with a charged surface, and could potentially be utilized in in vivo applications including as oxygen carriers or nucleic acid scavengers.

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Section: Resultsmentioning

confidence: 99%

Design of Asymmetric Particles Containing a Charged Interior and a Neutral Surface Charge: Comparative Study on in Vivo Circulation of Polyelectrolyte Microgels

Chen¹,

Xu²,

Luft³

et al. 2014

J. Am. Chem. Soc.

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“…Once fully polymerized, the thin film is insoluble in acetone due to the formation of highly cross-linked polymer network. An uncured or partially cured film would be stripped or destroyed by acetone [26]. …”

Section: Methodsmentioning

confidence: 99%

A fast thermal-curing nanoimprint resist based on cationic polymerizable epoxysiloxane

Zhang

et al. 2012

Nanoscale Res Lett

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We synthesized a series of epoxysiloxane oligomers with controllable viscosity and polarity and developed upon them a thermal-curable nanoimprint resist that was cross-linked in air at 110°C within 30 s if preexposed to UV light. The oligomers were designed and synthesized via hydrosilylation of 4-vinyl-cyclohexane-1,2-epoxide with poly(methylhydrosiloxane) with tunable viscosity, polarity, and cross-linking density. The resist exhibits excellent chemical and physical properties such as insensitivity toward oxygen, strong mechanical strength, and high etching resistance. Using this resist, nanoscale patterns of different geometries with feature sizes as small as 30 nm were fabricated via a nanoimprint process based on UV-assisted thermal curing. The curing time for the resist was on the order of 10 s at a moderate temperature with the help of UV light preexposure. This fast thermal curing speed was attributed to the large number of active cations generated upon UV exposure that facilitated the thermal polymerization process.

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“…Renewable source-based monomers, such as furfural or furfuryl alcohol, can be prepared by hydrolysis and acid-dehydration conversion of polysaccharides, including hemicelluloses, cellulose abundant bagasse, and corncob [3,4]. Furan resins have been made using phenol or formaldehyde by aldehyde condensation in the presence of an acid or alkali [5,6].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of environmental friendly halogen-free microporous terpolymer from renewable source with enhanced physical properties

Chauhan

2012

Designed Monomers and Polymers

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Design of Reversible Cross-Linkers for Step and Flash Imprint Lithography Imprint Resists

Cited by 40 publications

References 17 publications

Design of Asymmetric Particles Containing a Charged Interior and a Neutral Surface Charge: Comparative Study on in Vivo Circulation of Polyelectrolyte Microgels

Design of Asymmetric Particles Containing a Charged Interior and a Neutral Surface Charge: Comparative Study on in Vivo Circulation of Polyelectrolyte Microgels

A fast thermal-curing nanoimprint resist based on cationic polymerizable epoxysiloxane

Facile synthesis of environmental friendly halogen-free microporous terpolymer from renewable source with enhanced physical properties

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