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1.
ACS Appl Mater Interfaces ; 11(17): 15411-15416, 2019 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-30924633

RESUMO

A two-step synthesis is described for activating the surface of a fully hydrated hydrogel that is of interest as a possible scaffold for neural regeneration devices. The first step exploits the water content of the hydrogel and the hydrophobicity of the reaction solvent to create a thin oxide layer on the hydrogel surface using a common titanium or zirconium alkoxide. This layer serves as a reactive interface that enables rapid transformation of the hydrophilic, cell-nonadhesive hydrogel into either a highly hydrophobic surface by reaction with an alkylphosphonic acid, or into a cell-adhesive one using a (α,ω-diphosphono)alkane. Physically imprinting a mask ("debossing") into the hydrogel, followed by a two-step surface modification with a phosphonate, allows for patterning its surface to create spatially defined, cell-adhesive regions.


Assuntos
Adesão Celular , Hidrogéis/química , Animais , Adesão Celular/efeitos dos fármacos , Fumaratos/química , Hidrogéis/farmacologia , Interações Hidrofóbicas e Hidrofílicas , Camundongos , Microscopia , Células NIH 3T3 , Polietilenoglicóis/química , Propriedades de Superfície , Titânio/química , Zircônio/química
2.
ACS Biomater Sci Eng ; 3(12): 3123-3127, 2017 Dec 11.
Artigo em Inglês | MEDLINE | ID: mdl-33445355

RESUMO

Polymeric sheets were perforated by laser ablation and were uncompromised by a debris field when first treated with a thin layer of photoresist. Polymer sheets perforated with holes comprising 5, 10, and 20% of the nominal surface area were then patterned in stripes by photolithography, which was followed by synthesis in exposed regions of a cell-attractive zirconium oxide-1,4-butanediphosphonic acid interface. Microscopic and scanning electron microscopy analyses following removal of unexposed photoresist show well-aligned stripes for all levels of these perforations. NIH 3T3 fibroblasts plated on each of these perforated surfaces attached to the interface and spread in alignment with pattern fidelity in every case that is as high as that measured on a nonperforated, patterned substrate.

3.
ACS Appl Mater Interfaces ; 7(19): 10556-62, 2015 May 20.
Artigo em Inglês | MEDLINE | ID: mdl-25914946

RESUMO

In this Research Article, we demonstrate pulsed laser processing of a silver nanowire network transparent conductor on top of an otherwise complete solar cell. The macroscopic pulsed laser irradiation serves to sinter nanowire-nanowire junctions on the nanoscale, leading to a much more conductive electrode. We fabricate hybrid silicon/organic heterojunction photovoltaic devices, which have ITO-free, solution processed, and laser processed transparent electrodes. Furthermore, devices which have high resistive losses show up to a 35% increase in power conversion efficiency after laser processing. We perform this study over a range of laser fluences, and a range of nanowire area coverage to investigate the sintering mechanism of nanowires inside of a device stack. The increase in device performance is modeled using a simple photovoltaic diode approach and compares favorably to the experimental data.

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