Sol–gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

Kukobat, Radovan; Minami, Daiki; Hayashi, T.; Hattori, Yoshiyuki; Matsuda, Takafumi; Sunaga, Masahiko; Bharti, Bhuvnesh; Asakura, Kiyotaka; Kaneko, Katsumi

doi:10.1016/j.carbon.2015.07.025

Cited by 18 publications

(19 citation statements)

References 28 publications

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“…2h) due to the in-plane vibration of carbon-carbon bonds, whereas the G-band peak of bare SWCNTs is at 1589 cm -1 .Thisblue shift versus the pristine SWCNTs is attributed to the charge transfer from the SWCNTs to the PDMS. [33][34][35][36] The G-band peak shift for the black and white areas versus strain is shown in Fig. 2i.…”

Section: Concerted Interaction Between Swcnts and Pdms Under Strainmentioning

confidence: 99%

“…The other is the isolation of the SWCNTs from the PDMS with weaker charge transfer interactions. In the black area at lower strains, well dispersed and entangled SWCNTs undergo disentanglement 33 by dissipating strain through creases and thus interact more strongly with the PDMS.…”

Section: Concerted Interaction Between Swcnts and Pdms Under Strainmentioning

confidence: 99%

“…We must disperse SWCNT uniformly in PDMS media to produce stretchable SWCNT networks with good electrical contact. Newly developed Zn-Al sol gel dispersant for SWCNT bundles developed by our group is promising to embed stably the network of SWCNT in PDMS 33 .…”

mentioning

confidence: 99%

“…Water-proof Strain Sensor Fabrication. Firstly, SWCNTs were dispersed in water with a Zn-Al sol-gel dispersant following a previously described protocol 33 and utilized for making water resistive PDMS embedded strain sensor (PDMS/SWCNT/PDMS) as shown in Supplementary Fig. S1.…”

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confidence: 99%

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A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

et al. 2019

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Monitoring structural integrity during and after extreme events such as an earthquake or a tsunami is a mundane yet important task that still awaits a workable solution. Currently available stress sensors are not sufficiently robust and are affected by humidity. Insufficient information about crack formation preceding structural failure increases risk during rescue operations significantly. Designing durable stress sensors that are not affected by harsh and changing environment and do not fail under catastrophic conditions is a fundamental challenge. To address this problem, we developed a stress sensor based on creased singlewalled carbon nanotubes (SWCNTs) encapsulated in a non-fluorinated superhydrophobic coating. The creased SWCNT film was fabricated and integrated in polydimethylsiloxane (PDMS) to provide a highly linear response under elastic deformation. The non-fluorinated water-repellent coating was fabricated by spray-coating the film with nanosilica particles, providing water resistance during elastic deformation.The compact design and superior water resistance of the sensor, along with its appealing linearity and 1 large stretchability, demonstrates the scalability of this approach for fabricating efficient strain sensors for applications in infrastructure and robotic safety management as well as advanced wearable sensors.Monitoring structural integrity during and after extreme events such as an earthquake or a tsunami is a mundane yet important task that still awaits a workable solution. Additionally, the mechanical frame strength of transportation must be continuously monitored for sufficient safety. Currently available strain sensors are not sufficiently robust and are affected by humidity. A water-proof strain sensor would be applicable for infrastructure safety management in harsh environments. Such a harmless water-proof strain sensor could also be used as an advanced wearable sensor. Insufficient information about crack formation preceding structural failure increases risk during rescue operations significantly. To address this problem, we developed a strain sensor based on creased single-walled carbon nanotubes (SWCNTs) encapsulated in a non-fluorinated superhydrophobic coating. The SWCNT film was fabricated and integrated in polydimethylsiloxane (PDMS) to provide a highly linear response under elastic deformation.The non-fluorinated water-repellent coating was fabricated by spray-coating the film with nanosilica particles, providing water resistance during elastic deformation. The compact design and superior water resistance of the sensor, along with its appealing linearity and large stretchability, demonstrates the scalability of this approach for fabricating efficient strain sensors for applications in infrastructure and robotic safety management.Governments must guarantee safety and present environments to preserve life while maintaining a comfortable urban landscape with minimal economic burden. Particularly, numerous infrastructures, such as buildings, bridges, dams, and tunnels, in adva...

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Section: Concerted Interaction Between Swcnts and Pdms Under Strainmentioning

confidence: 99%

Section: Concerted Interaction Between Swcnts and Pdms Under Strainmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

et al. 2019

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“…The SWCNT inks can be prepared with the aid of organic surfactants, 19−26 polymers, 19,27−29 organic solvents, 30,31 super acids, 32,33 chemical functionalization, 34−36 and inorganic dispersants recently developed by our group. 37,38 Sodium dodecyl sulfonate (SDS), sodium dodecyl benzene sulfonate (SDBS), lithium dodecyl sulfate, tetradecyl trimethyl ammonium bromide, and sodium cholate are widely used organic surfactants for SWCNT ink preparation. 39,40 In particular, SDS and SDBS are commonly used organic surfactants for SWCNT film preparation.…”

Section: Introductionmentioning

confidence: 99%

Essential Role of Viscosity of SWCNT Inks in Homogeneous Conducting Film Formation

et al. 2016

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Newly developed inorganic single-wall carbon nanotube (SWCNT) inks of the Zn/Al complex and colloidal silica give a quite homogeneous SWCNT film on the polyethylene terephthalate (PET) substrate by the bar-coating method, whereas the surfactant-based SWCNT inks of sodium dodecyl sulfonate (SDS) and sodium dodecyl benzene sulfonate (SDBS) cannot give a homogeneous film. The key properties of SWCNT inks were studied for the production of homogeneous SWCNT films. The contact angle and surface tension of the inorganic dispersant-based SWCNT inks were 70° and 72 mN m(-1), respectively, being close to those of water (71.5° and 71 mN m(-1)). The viscosity was significantly higher than that of water (0.90 mPa·s), consequently, providing sufficient wettability, spreadability, and slow drying of the ink on the substrate, leading to homogeneous film formation. On the other hand, the surfactant dispersant-aided SWCNT inks have the contact angle and surface tension twice lower than the inorganic dispersant-based SWCNT inks, guaranteeing better wettability and spreadability than the inorganic dispersant-based inks. However, the small viscosity close to that of water induces a heterogeneous flow of SWCNT ink on rapid drying, leading to inhomogeneous film formation.

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Single‐walled Carbon Nanotubes Dispersed by CO₂ Responsive Surfactants for Fabricating High Conductive Epoxy Composites

et al. 2023

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The emerging nanomaterials single‐walled carbon nanotube (SWNTs) with large specific surface area, excellent electrical conductivity and high mechanical strength, has been used to fabricate electronic devices. However, the extremely strong π‐π interactions make SWNTs easy to agglomerate, thus limiting their application. In this work, a novel method was applied to disperse SWNTs by using rigid rosin‐based CO2 responsive surfactant rosin acid dimaleimide choline (R‐BMI‐C). When pH 10.4, SWNTs can be uniformly and stably dispersed, and at pH 6.3, SWNTs aggregated. The dispersed SWNTs was then integrated into diglycidyl ether of bis phenol A (DGEBA) to fabricate high conductive epoxy composites. Their properties were characterized by SEM, TG, high resistivity meters, etc.. The results showed that the modified SWNTs/DGEBA composites obtained an ultra‐low percolation threshold (0.025 wt.%). Compared with the original SWNTs/DGEBA composite, its tensile strength and elastic modulus were enhanced by 17 % and 96 %, respectively, when the SWNTs content was 0.5 wt.%.

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Sol–gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

Cited by 18 publications

References 28 publications

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

Essential Role of Viscosity of SWCNT Inks in Homogeneous Conducting Film Formation

Single‐walled Carbon Nanotubes Dispersed by CO₂ Responsive Surfactants for Fabricating High Conductive Epoxy Composites

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Sol–gel chemistry mediated Zn/Al-based complex dispersant for SWCNT in water without foam formation

Cited by 18 publications

References 28 publications

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

A water-resilient carbon nanotube based strain sensor for monitoring structural integrity

Essential Role of Viscosity of SWCNT Inks in Homogeneous Conducting Film Formation

Single‐walled Carbon Nanotubes Dispersed by CO2 Responsive Surfactants for Fabricating High Conductive Epoxy Composites

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Single‐walled Carbon Nanotubes Dispersed by CO₂ Responsive Surfactants for Fabricating High Conductive Epoxy Composites