Semi‐IPNs Reinforced with Silica Janus Nanoparticles and Their Stress Sensing with Mechanoluminescent Probe

Mou-cheng, WU; Yuan, Wei; Yang, Fan; Liang, Fuxin; Chen, Yulan

doi:10.1002/marc.202000442

Cited by 10 publications

(6 citation statements)

References 45 publications

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“…Taking advantage of the superb absorbing property, HPTS is loaded into the nanopores of HMO capsules. 47,48 By measuring the absorption spectra (Figure S3), the photoacid HPTS loaded in HMO capsules was proved to be the protonated species (absorbs at 400 nm). 39 As shown in Figure 1c, the fabricated humidity sensors exhibit an RH-dependent emission color under 365 nm UV illumination.…”

Section: P P a Lnmentioning

confidence: 99%

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Guo

Sha

Wang

et al. 2022

ACS Appl. Nano Mater.

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Humidity sensing has a wide application and receives intense attention from a broad spectrum of research areas. In this work, we demonstrated a robust humidity sensing strategy by loading photoacid HPTS (8-hydroxypyrene-1,3,6-trisulfonic acid, trisodium salt) into nanopores of hollow mesoporous organosilica (HMO) capsules. Taking advantage of the capillary condensation of nanopores, water vapor is enriched, which triggers the fluorescent color change of HPTS through intermolecular excited-state proton transfer (ESPT) for humidity sensing. The ESPT induced fluorescent color change behavior of HPTS loaded in nanopores was comprehensively investigated by using both steady and picosecond time-resolved fluorescence spectroscopy. The fabricated humidity sensors exhibit rapid response and recovery, qualified reversibility, and selectivity, which enable continuous monitoring of human respiration. Notably, the sensing performance, i.e., sensitivity and response range, can be effectively tuned by fabricating HMO capsules with properly sized nanopores, which provides an opportunity to design unique nanostructures of the humidity sensor for specific applications.

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Section: P P a Lnmentioning

confidence: 99%

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Guo

Sha

Wang

et al. 2022

ACS Appl. Nano Mater.

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“…25 Representative studies include the spiropyran OFP activation at the interface of SiO 2 NP fillers in a poly(methyl acrylate) (PMA) matrix 26 or in laminate composites, 27 a coumarin dimer OFP in nanocomposites, 28 or SiO 2 NPs with the dioxetane OFP. 29 Epoxies are prototypical examples of polymers that benefit from compounding. They exhibit stiffness in the GPa range and very low fracture toughness due to their highly cross-linked, brittle nature.…”

Section: Introductionmentioning

confidence: 99%

“…Polymer mechanochemistry, and in particular the development of optical force probes (OFPs), − can aid in this endeavor by visually tracking the material’s optical response to force . Representative studies include the spiropyran OFP activation at the interface of SiO 2 NP fillers in a poly(methyl acrylate) (PMA) matrix or in laminate composites, a coumarin dimer OFP in nanocomposites, or SiO 2 NPs with the dioxetane OFP …”

Section: Introductionmentioning

confidence: 99%

Confocal Microscopy Visualizes Particle–Crack Interactions in Epoxy Composites with Optical Force Probe-Cross-Linked Rubber Particles

2022

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Brittle fracture often compromises the durability of glassy polymers. This can be mitigated by reinforcing the matrix with a filler, activating a range of toughening mechanisms. Therefore, it is desirable to better understand the mechanical response of polymer composites, but a direct visualization of the mechanical fate of second-phase inclusions upon material fracture was previously unavailable. Here, rubbery poly(hexyl acrylate) particles, cross-linked with an optical force probe (OFP), are dispersed within an epoxy matrix, the material is fractured, and particle–crack interactions are visualized with confocal laser scanning microscopy. The dual-fluorescence character of the OFPs allows the differentiation between particles that remain intact and those that are stressed beyond bond scission upon interaction with a propagating crack. The localized activation of OFPs reveals stress gradients within the particles and crack direction pathways, hence providing a new layer of information over fracture events in polymer composites.

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“…The composite nanoparticle with a non-centrosymmetric structure with two or more chemical partitions is named Janus nanoparticles (JNs). [31] Hence, the JNs can integrate multifunctionality or/and polyreactivity, inspiring their applications in the field of interfacial engineering, [32,33] sensors, [34] drug delivery, [35] etc. In fact, these works mainly focused on the multifunctionality of JNs, the polyreactivity is often overlooked.…”

Section: Introductionmentioning

confidence: 99%

Janus Nanoparticle Coupled Double‐Network Hydrogel

Hou

Yang

Zhao

et al. 2022

Macromol. Rapid Commun.

Self Cite

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For double network (DN) hydrogels, their performance can be tuned by adjusting the interaction between their two networks. A novel DN hydrogel toughening approach is proposed by employing Janus nanoparticles (JNs) as crosslinkers to gain a conjoined‐network hydrogel. First, a kind of JNs modified by amino groups and quaternary ammonium salt is synthesized, named R3N+‐JN‐NH2. The DN hydrogel is fabricated based on ionic coordination between calcium chloride (CaCl2) and sodium alginate (Alg), as well as covalent (benzoic imine) between glycol chitosan (GC) and benzaldehyde‐capped poly(ethylene oxide) (BzCHO−PEO−BzCHO). Based on the same covalent and ionic dynamic crosslinking mechanism, the added R3N+‐JN‐NH2 interacts with two networks to promote crosslinking to form a dually crosslinked structure. The R3N+‐JN‐NH2 effectively provides more energy dissipation, and the hydrogel with conjoined networks shows better compression resistance.

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Semi‐IPNs Reinforced with Silica Janus Nanoparticles and Their Stress Sensing with Mechanoluminescent Probe

Cited by 10 publications

References 45 publications

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Confocal Microscopy Visualizes Particle–Crack Interactions in Epoxy Composites with Optical Force Probe-Cross-Linked Rubber Particles

Janus Nanoparticle Coupled Double‐Network Hydrogel

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