Synergy between silk fibroin and ionic liquids for active gas-sensing materials

Moreira, Inês P.; Esteves, Carina; Palma, Susana; Ramou, Efthymia; Carvalho, Ana Luı́sa; Roque, Ana C. A.

doi:10.1016/j.mtbio.2022.100290

Cited by 15 publications

(24 citation statements)

References 40 publications

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“…Triplicates of sensing films were placed in the detection chamber and exposed to five humidification/drying periods for each RH level. The optical signals were acquired with the associated in-house developed optical signal transducer at constant temperature (room temperature of 22 ± 2 °C) [ 1 , 13 , 14 , 15 , 16 ]. To establish the humidification and drying periods, the MFC1 flow rate was constant at 1.5 slpm while MFC2 was programmed to alternately switch the flow rate between 120 s at 0 slpm (drying period) and 120 s at 1.5 slpm (humidification period).…”

Section: Methodsmentioning

confidence: 99%

Effect of Polymer Hydrophobicity in the Performance of Hybrid Gel Gas Sensors for E-Noses

Oliveira

Costa

Ramou

et al. 2023

Sensors

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Relative humidity (RH) is a common interferent in chemical gas sensors, influencing their baselines and sensitivity, which can limit the performance of e-nose systems. Tuning the composition of the sensing materials is a possible strategy to control the impact of RH in gas sensors. Hybrid gel materials used as gas sensors contain self-assembled droplets of ionic liquid and liquid crystal molecules encapsulated in a polymeric matrix. In this work, we assessed the effect of the matrix hydrophobic properties in the performance of hybrid gel materials for VOC sensing in humid conditions (50% RH). We used two different polymers, the hydrophobic PDMS and the hydrophilic bovine gelatin, as polymeric matrices in hybrid gel materials containing imidazolium-based ionic liquids, [BMIM][Cl] and [BMIM][DCA], and the thermotropic liquid crystal 5CB. Better accuracy of VOC prediction is obtained for the hybrid gels composed of a PDMS matrix combined with the [BMIM][Cl] ionic liquid, and the use of this hydrophobic matrix reduces the effect of humidity on the sensing performance when compared to the gelatin counterpart. VOCs interact with all the moieties of the hybrid gel multicomponent system; thus, VOC correct classification depends not only on the polymeric matrix used, but also on the IL selected, which seems to be key to achieve VOCs discrimination at 50% RH. Thus, hybrid gels’ tunable formulation offers the potential for designing complementary sensors for e-nose systems operable under different RH conditions.

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Section: Methodsmentioning

confidence: 99%

Effect of Polymer Hydrophobicity in the Performance of Hybrid Gel Gas Sensors for E-Noses

Oliveira

Costa

Ramou

et al. 2023

Sensors

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“…After rapid desolvation with methanol and being adsorbed with naringin (5,7-dihydroxy-2-(4-hydroxyphenyl), which possessed a wide pharmacological effect, SF nanoparticles loaded with naringin drugs were successfully obtained. This material has higher in vitro antitumor ability than free naringin for HeLa cancer cells [ 34 ]. Additionally, as shown in Figure 6 b, SF and IL mixed solution prepared by ultrasound was quickly injected into excessive polar organic solvents such as acetone, ethanol or methanol to form SF suspension, to be easily separated from IL, and then SF nanoparticles could be obtained via centrifugation or filtration [ 97 ].…”

Section: Preparation Progress Of Sf Materialsmentioning

confidence: 99%

“…Using neutral salt solutions, such as calcium chloride ethanol aqueous solution (CaCl 2 -C 2 H 5 OH-H 2 O) and calcium nitrate methanol aqueous solution (Ca(NO 3 ) 2 -CH 3 OH-H 2 O), can bring up a number of problems. For example, the long dissolving time generates an unstable solution that can easily degrade [ 20 , 24 , 33 , 34 ]. In addition, these solvents are highly toxic, volatile and difficult to recover, causing serious pollution to the environment.…”

Section: Introductionmentioning

confidence: 99%

Recent Research Progress of Ionic Liquid Dissolving Silks for Biomedicine and Tissue Engineering Applications

Heng

Deng

Yang

et al. 2022

IJMS

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Ionic liquids (ILs) show a bright application prospect in the field of biomedicine and energy materials due to their unique recyclable, modifiability, structure of cation and anion adjustability, as well as excellent physical and chemical properties. Dissolving silk fibroin (SF), from different species silkworm cocoons, with ILs is considered an effective new way to obtain biomaterials with highly enhanced/tailored properties, which can significantly overcome the shortcomings of traditional preparation methods, such as the cumbersome, time-consuming and the organic toxicity caused by manufacture. In this paper, the basic structure and properties of SF and the preparation methods of traditional regenerated SF solution are first introduced. Then, the dissolving mechanism and main influencing factors of ILs for SF are expounded, and the fabrication methods, material structure and properties of SF blending with natural biological protein, inorganic matter, synthetic polymer, carbon nanotube and graphene oxide in the ILs solution system are introduced. Additionally, our work summarizes the biomedicine and tissue engineering applications of silk-based materials dissolved through various ILs. Finally, according to the deficiency of ILs for dissolving SF at a high melting point and expensive cost, their further study and future development trend are prospected.

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“…[76][77][78][79][80][81] Ionic liquids have been used as solvents for proteins for fundamental and applied research, [82][83][84][85][86][87][88][89][90] including various silk proteins. [61,[91][92][93][94][95][96][97][98][99] Pioneering work has employed the combination of ionic liquids and silk proteins to generate materials for energy storage applications, including batteries [59,100] and capacitors. [101][102][103] This study builds upon the exciting examples of combining silks and ionic liquids for energy storage, [59,100] by comparing metal-air primary batteries employing Mg/Zn, B. mori SF, and a choline-based ionic liquid (choline nitrate).…”

Section: Introductionmentioning

confidence: 99%

“…[ 76–81 ] Ionic liquids have been used as solvents for proteins for fundamental and applied research, [ 82–90 ] including various silk proteins. [ 61,91–99 ] Pioneering work has employed the combination of ionic liquids and silk proteins to generate materials for energy storage applications, including batteries [ 59,100 ] and capacitors. [ 101–103 ]…”

Section: Introductionmentioning

confidence: 99%

Mg/Zn metal‐air primary batteries using silk fibroin‐ionic liquid polymer electrolytes

et al. 2022

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Batteries are utilized in a multitude of devices encountered in our daily lives. Here we describe a comparative study of Magnesium‐air and Zinc‐air primary batteries using silk fibroin‐ionic liquid polymer electrolytes (composed of Bombyx mori silk fibroin and choline nitrate). The ionic conductivity of the films was of the order of mS cm−1 which is sufficient to satisfy the conductivity requirements for many battery applications, the open circuit voltages (V) for the Mg 1:1 SF:IL and 1:3 SF:IL batteries just after fabrication were ca. 1.8 and 1.7 V, respectively; the 1:1 SF:IL battery had a capacity of 0.84 mAh cm−2, whereas the 1:3 SF:IL battery had a capacity of 0.68 mAh cm−2. The open circuit voltages (V) for the Zn 1:1 SF:IL and 1:3 SF:IL batteries were in the range of 1.3 and 1.2 V just after fabrication; the 1:3 SF:IL battery displayed a capacity of 0.96 mAh cm−2 and the 1:3 SF:IL battery displayed a capacity of 0.72 mAh cm−2. Integration of the PE and substitution of the carbon cloth electrodes with degradable materials would offer routes to production of transient primary batteries helping to address the global issue of electronic waste (e‐waste).

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Synergy between silk fibroin and ionic liquids for active gas-sensing materials

Cited by 15 publications

References 40 publications

Effect of Polymer Hydrophobicity in the Performance of Hybrid Gel Gas Sensors for E-Noses

Effect of Polymer Hydrophobicity in the Performance of Hybrid Gel Gas Sensors for E-Noses

Recent Research Progress of Ionic Liquid Dissolving Silks for Biomedicine and Tissue Engineering Applications

Mg/Zn metal‐air primary batteries using silk fibroin‐ionic liquid polymer electrolytes

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