Characterization of patterned poly(methyl methacrylate) brushes under various structures upon solvent immersion

Chen, Jem-Kun; Hsieh, Chih-Yi; Huang, Chih‐Feng; Li, Pomin

doi:10.1016/j.jcis.2009.06.040

Cited by 47 publications

(38 citation statements)

References 31 publications

(29 reference statements)

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“…These were curve fitted using peaks with binding energies of 284.2, 285.8, and 287.6 eV, attributable to chemical bonding environments C-C/H, C-N, and C=O of PVP, respectively. [22][23][24][25] For the precursor that had been treated at 700°C, a signal appeared at a binding energy of 285.4 eV. This value is inconsistent with the binding energy of a V-C bond (282.5 eV) [26], but is quite close to that reported for C-O bonds in superfical carbon-doped TiO 2 samples [27].…”

Section: Resultsmentioning

confidence: 46%

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Chen

2012

J Mater Sci

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In this study, we synthesized vanadium (V) nanoparticles precursor (NH 4 ) 5 [(VO) 6 (CO 3 ) 4 (OH) 9 ]Á10H 2 O a two-phase system of toluene and water. Colloid solution including titanium(IV) isopropoxide and polyvinylpyrrolidone (PVP) was subsequently deposited onto the nanoparticles to form urchin-like structures in a toluene solution as the vanadium-titanium (V-Ti) complex precursor. Calcining the urchin-like precursor at 700°C generated nanowhiskers of the Ti/V oxide complex after annealing process. These nanowhiskers were characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron microscopy (XPS). Films of the Ti/V oxide nanowhisker structure exhibited good visible transparency and a large change in transmittance at near-infrared (NIR) wavelengths before and after the metal-insulator phase transition. For a 44-nm-thick single-layer nanowhisker thin film, the transmittances at 700 nm in the metallic (M) and semiconductive (S) states were 75 and 72.2 %, respectively; the NIR switching efficiency (DT 2000 ) increased from 17 to 21.3 % at 2000 nm under UV light irradiation. In addition, the nanowhisker thin film of the Ti/V oxide complex significantly enhanced the photodecomposition of methylene blue under UV irradiation, relative to that of the unmodified TiO 2 . The dual functions of this material-thermochromicity and photocatalytic behavior-suggest that it might have interesting applications in energy-saving smart windows.

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Section: Resultsmentioning

confidence: 46%

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Chen

2012

J Mater Sci

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“…The variation of resolutions for lines patterned PHEMA brushes on the silicon surface referred to the grafting site area of Si-BPOTS for ATRP system. These results suggest that the resolution of the grafted PMMA brushes corresponded to the grafted site on the surface [41]. The aspectratio, defined as the ratio of height to width for shape description, is calculated from the layer of the thickness and width of the grafted polymer layer.…”

Section: Surface Topographymentioning

confidence: 77%

“…We observed imperfect line patterns for the PHEMA brushes when the trenches had dimensions of less than 350 nm prior to graft polymerization. The thickness reached a plateau, indicating the formation of the PMMA brushes under rich grafted site as the lithography pattern over about 5 lm [41]. The variation of resolutions for lines patterned PHEMA brushes on the silicon surface referred to the grafting site area of Si-BPOTS for ATRP system.…”

Section: Surface Topographymentioning

confidence: 97%

“…9c and d). The surface possessed the coil-like structure because of the isotropic or nematic collapse of the PHEMA brushed in the presence of the poor solvent [27,41]. The line patterns of these PHEMA structures had different heights after treatment in methanol and cyclohexane because of the presence of the brushand coil-like regimes, respectively.…”

Section: Surface Topographymentioning

confidence: 99%

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Fabrication of high-aspect-ratio poly(2-hydroxyethyl methacrylate) brushes patterned on silica surfaces by very-large-scale integration process

Chen¹,

Chen²

2011

Journal of Colloid and Interface Science

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“…The direct characterization of grafted polymer through the "grafting from" method is difficult. Generally, a sacrificial initiator is used, assuming that the polymer growth is similar on the surface and in the medium [51,52,58,59,[82][83][84][85]. Another method is to use reversible or breakable surface bonds in order to detach and study the grafted polymer [86].…”

Section: Grafting Techniques 321 Atom Transfer Radical Polymerizatmentioning

confidence: 99%

PNIPAM grafted surfaces through ATRP and RAFT polymerization: Chemistry and bioadhesion

Conzatti

Cavalié

Combes

et al. 2017

Colloids and Surfaces B: Biointerfaces

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a b s t r a c tBiomaterials surface design is critical for the control of materials and biological system interactions. Being regulated by a layer of molecular dimensions, bioadhesion could be effectively tailored by polymer surface grafting. Basically, this surface modification can be controlled by radical polymerization, which is a useful tool for this purpose. The aim of this review is to provide a comprehensive overview of the role of surface characteristics on bioadhesion properties. We place a particular focus on biomaterials functionalized with a brush surface, on presentation of grafting techniques for "grafting to" and "grafting from" strategies and on brush characterization methods. Since atom transfer radical polymerization (ATRP) and reversible addition-fragmentation chain transfer (RAFT) polymerization are the most frequently used grafting techniques, their main characteristics will be explained. Through the example of poly(N-isopropylacrylamide) (PNIPAM) which is a widely used polymer allowing tuneable cell adhesion, smart surfaces involving PNIPAM will be presented with their main modern applications.

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Characterization of patterned poly(methyl methacrylate) brushes under various structures upon solvent immersion

Cited by 47 publications

References 31 publications

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Synthesis of doubly functional nanowhiskers from a colloid solution including a V–Ti complex precursor

Fabrication of high-aspect-ratio poly(2-hydroxyethyl methacrylate) brushes patterned on silica surfaces by very-large-scale integration process

PNIPAM grafted surfaces through ATRP and RAFT polymerization: Chemistry and bioadhesion

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