Synthesis of Poly(Dimethylsiloxane) Networks Functionalized with Imidazole or Benzimidazole for Copper(II) Removal from Water

Pissetti, Fábio L.; Araújo, Pedro L. de; Silva, Fábio A. B.; Poirier, Gaël

doi:10.5935/0103-5053.20140264

Cited by 9 publications

(6 citation statements)

References 1 publication

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“…FTIR spectrum of the 12-mm-diameter sample of PDMS at room temperature. The absorption bands are in agreement to those previously reported[27,28].…”

supporting

confidence: 92%

Giant room-temperature barocaloric effects in PDMS rubber at low pressures

Carvalho

Imamura

Usuda

et al. 2018

European Polymer Journal

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The barocaloric effect is still an incipient scientific topic, but it has been attracting an increasing attention in the last years due to the promising perspectives for its application in alternative cooling devices. Here, we present giant values of barocaloric entropy change and temperature change induced by low pressures in PDMS elastomer around room temperature.Adiabatic temperature changes of 12.0 K and 28.5 K were directly measured for pressure changes of 173 MPa and 390 MPa, respectively, associated with large normalized temperature changes (~70 K GPa -1 ). From adiabatic temperature change data, we obtained entropy change values larger than 140 J kg -1 K -1 . We found barocaloric effect values that exceed those previously reported for any promising barocaloric materials from direct measurements of temperature change around room temperature. Our results stimulate the study of the barocaloric effect in elastomeric polymers and broaden the pathway to use this effect in solid-state cooling technologies.2

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“…FTIR spectrum of the 12-mm-diameter sample of PDMS at room temperature. The absorption bands are in agreement to those previously reported[27,28].…”

supporting

confidence: 92%

Giant room-temperature barocaloric effects in PDMS rubber at low pressures

Carvalho

Imamura

Usuda

et al. 2018

European Polymer Journal

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“…The signal at—65 ppm is corresponding to the formation of Si–O–Si, whereas the other signal at—58 ppm is attributed to the Si–OH structure from the incomplete condensation. 19 Again, the 29 Si NMR spectra are very similar across the samples, implying a similar amount of Si species. Second, to examine whether the cosolvent would react with other components in the HAp–Gemosil composite, that is, HAp–Gel and Ca(OH) 2 with CHX, we applied FTIR to study the HAp–Gemosil composite.…”

Section: Resultsmentioning

confidence: 84%

“…As shown in the Supporting Information Figure S2, for all silane networks with different processing cosolvents, we observed two Si peaks. The signal at65 ppm is corresponding to the formation of Si–O–Si, whereas the other signal at58 ppm is attributed to the Si–OH structure from the incomplete condensation . Again, the 29 Si NMR spectra are very similar across the samples, implying a similar amount of Si species.…”

Section: Resultsmentioning

confidence: 91%

Dramatic Improvement of the Mechanical Strength of Silane-Modified Hydroxyapatite–Gelatin Composites via Processing with Cosolvent

Huang

Lee

et al. 2018

ACS Omega

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Bone tissue engineering (BTE) requires a sturdy biomaterial for scaffolds for restoration of large bone defects. Ideally, the scaffold should have a mechanical strength comparable to the natural bone in the implanted site. We show that adding cosolvent during the processing of our previously developed composite of hydroxyapatite–gelatin with a silane cross-linker can significantly affect its mechanical strength. When processed with tetrahydrofuran (THF) as the cosolvent, the new hydroxyapatite–gelatin composite can demonstrate almost twice the compressive strength (97 vs 195 MPa) and biaxial flexural strength (222 vs 431 MPa) of the previously developed hydroxyapatite–gelatin composite (i.e., processed without THF), respectively. We further confirm that this mechanical strength improvement is due to the improved morphology of both the enTMOS network and the composite. Furthermore, the addition of cosolvents does not appear to negatively impact the cell viability. Finally, the porous scaffold can be easily fabricated, and its compressive strength is around 11 MPa under dry conditions. All these results indicate that this new hydroxyapatite–gelatin composite is a promising material for BTE application.

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“…62 The bands at 1408 and 1258 cm −1 were associated with the asymmetric and symmetrical deformations of the C−H bond of the Si(CH 3 ) 2 groups, respectively. 63 The rocking deformation of C−H and Si−C bond stretching were observed at 843 and 790 cm −1 , respectively (Figure 5a). The symmetric stretching of the −CF 3 groups in the analyzed diazirines was seen in the 1140 cm −1 region.…”

Section: Surface Characterizationmentioning

confidence: 99%

Functionalization of Polydimethylsiloxane with Diazirine-Based Linkers for Covalent Protein Immobilization

Li,

Bi,

Musolino

et al. 2023

ACS Appl. Mater. Interfaces

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Biomolecule attachment to solid supports is critical for biomedical devices, such as biosensors and implants. Polydimethylsiloxane (PDMS) is commonly used for these applications due to its advantageous properties. To enhance the biomolecule immobilization on PDMS, a novel technique is demonstrated using newly synthesized diazirine molecules for the surface modification of PDMS. This nondestructive process involves a reaction between diazirine molecules and PDMS through C−H insertion with thermal or ultraviolet activation. The success of the PDMS modification is confirmed by various surface characterization techniques. Bovine serum albumin (BSA) and immunoglobulin G (IgG) are strongly attached to the modified PDMS surfaces, and the amount of protein is quantified using iodine-125 radiolabeling. The results demonstrate that PDMS is rapidly functionalized, and the stability of the immobilized proteins is significantly improved with multiple types of diazirine molecules and activation methods. Confocal microscopy provides three-dimensional images of the distribution of immobilized IgG on the surfaces and the penetration of diazirine-based linkers through the PDMS substrate during the coating process. Overall, this study presents a promising new approach for functionalizing PDMS surfaces to enhance biomolecule immobilization, and its potential applications can extend to multimaterial modifications for various diagnostic and medical applications such as microfluidic devices and immunoassays with relevant bioactive proteins.

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Synthesis of Poly(Dimethylsiloxane) Networks Functionalized with Imidazole or Benzimidazole for Copper(II) Removal from Water

Cited by 9 publications

References 1 publication

Giant room-temperature barocaloric effects in PDMS rubber at low pressures

Giant room-temperature barocaloric effects in PDMS rubber at low pressures

Dramatic Improvement of the Mechanical Strength of Silane-Modified Hydroxyapatite–Gelatin Composites via Processing with Cosolvent

Functionalization of Polydimethylsiloxane with Diazirine-Based Linkers for Covalent Protein Immobilization

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