Characterizing and Tuning the Properties of Polydiacetylene Films for Sensing Applications

Finney, Tanner J.; Parikh, Sanjai J.; Berman, Amir; Sasaki, Darryl Y.; Kuhl, Tonya L.

doi:10.1021/acs.langmuir.1c02004

Cited by 6 publications

(17 citation statements)

References 53 publications

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“…The dose and normal stress followed similar trends; higher doses of UV light or pressure were required to fully induce the blue‐to‐red transition in DA films with longer alkyl tails. [ 24 ] Interestingly, when Zn and Fe were added to the Langmuir trough subphase, the resulting PDA films were found to be unable to undergo normal stress induced transitions within the range applied by the SFA (the maximum normal stress applied in these experiments was approximately 700 nN µm −2 ).…”

Section: Pda Film Calibrationmentioning

confidence: 97%

“…UV dose to induce the blue‐to‐red transition and produce fully red phase films at the air‐water in a Langmuir trough is added for comparison (right axis). [ 24 ]…”

Section: Pda Film Calibrationmentioning

confidence: 99%

“…Films formed from TCDA (C23) exhibit massive polymer domains, often as large as 0.1 mm 2 , while films formed from DAs with longer alkyl tails have domains typically between 10 and 100 µm 2 . [ 24 ] Figure 3B shows a transformed TCDA contact region where the entire area of contact was contained within a single domain, and the shear direction was aligned with the orientation of the domain.…”

Section: Pda Film Calibrationmentioning

confidence: 99%

“…Zn‐PDA films demonstrate: strong reversible thermochromism at temperatures <200 °C, but the fluorescence is inhibited when thermally transformed. [ 24,31,32 ] When sheared, Zn‐PCDA films undergo the blue‐to‐red transition with fluorescence, Figure . We hypothesize that shearing disrupts the Zn 2 + bridging bidentate complexes between neighboring carboxylic acid head groups, [ 24,31,34 ] which enables it to fluorescence similar to a regular film in the absence of Zn 2 + cations.…”

Section: Pda Film Calibrationmentioning

confidence: 99%

“…Domain size and the shear stress required for the blue-tored transition can be strongly modified by adding metal cations during film formation, providing an independent means for tuning the characteristics of the PDA film. [24,[31][32][33][34] Our previous work characterized the effect of metal cations on UV light induced blue-to-red transitions. [24] Building upon this work, the mechanochromism of Fe-PCDA and Zn-PCDA were investigated.…”

Section: Shear Stress Induced Mechanochromismmentioning

confidence: 99%

See 4 more Smart Citations

Tracking Mechanical Stress and Cell Migration with Inexpensive Polymer Thin‐Film Sensors

Finney

Frank

Bull

et al. 2022

Adv Materials Inter

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Polydiacetylene (PDA) Langmuir films are well known for their blue‐to‐red chromatic transitions in response to a variety of stimuli, including UV light, heat, bio‐molecule bindings, and mechanical stress. In this work, the ability to tune PDA Langmuir films to exhibit discrete chromatic transitions in response to applied mechanical stress is detailed. Normal and shear‐induced transitions are quantified using the Surface Forces Apparatus and established to be binary and tunable as a function of film formation conditions. Both monomer alkyl tail length and metal cations are used to manipulate the chromatic transition force threshold to enable discrete force sensing from ≈50 to ≈500 nN µm−2 for normal loading and ≈2 to ≈40 nN µm−2 for shear‐induced transitions, which are appropriate for biological cells. The utility of PDA thin‐film sensors is demonstrated with the slime mold Physarum polycephalum. The fluorescence readout of the films enabled: the area explored by Physarum to be visualized, the forces involved in locomotion to be quantified, and revealed novel puncta formation potentially associated with Physarum sampling its environment.

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Section: Pda Film Calibrationmentioning

confidence: 97%

“…UV dose to induce the blue‐to‐red transition and produce fully red phase films at the air‐water in a Langmuir trough is added for comparison (right axis). [ 24 ]…”

Section: Pda Film Calibrationmentioning

confidence: 99%

Section: Pda Film Calibrationmentioning

confidence: 99%

Section: Pda Film Calibrationmentioning

confidence: 99%

Section: Shear Stress Induced Mechanochromismmentioning

confidence: 99%

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Tracking Mechanical Stress and Cell Migration with Inexpensive Polymer Thin‐Film Sensors

Finney

Frank

Bull

et al. 2022

Adv Materials Inter

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Bio‐Inspired Polydiacetylene Vesicles for Controlling Stimulus Sensitivity

Nakayama,

Suga,

Kamata

et al. 2024

Macro Reaction Engineering

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Polydiacetylene (PDA) is a kind of photopolymerizable polymer, which exhibits a unique color transition in response to external stimuli such as heat, pH, and solvent. PDAs are attractive as eye‐detection stimulus sensors with excellent time performance; however, the sensitivity of PDAs should be improved. Considering the biological membrane‐like structure of diacetylene (DA) vesicles, their modification by incorporating membrane lipids (e.g., diacylphosphocholine, PC) can be used to control the membrane fluidity, and consequently molecular ordering of DAs in the vesicle. Inspired by biological membrane systems, lipid vesicles are employed as platforms to generate PDA, and essential factors that influence the sensitivity of PDA are investigated. By lowering the polymerization temperature, the generation of PDA becomes slower, while the sensitivity improves. By adding PCs at the molar ratio of lipid:DA = 1:1, the sensitivity of PDA can be varied: the PCs with lower phase transition temperatures (Tm) made PDA insensitive, while the PCs with higher Tm improved the sensitivity as compared to pure poly(PCDA). It is concluded that the photopolymerization of DAs with a lower membrane fluidity induces highly sensitive PDA, while the photopolymerization of DAs with a higher membrane fluidity induces insensitive PDA with robustness toward stimuli.

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Assembling Triphenylene-Based Metal–Organic Framework Nanosheets at the Air/Liquid Interface: Modification by Tuning the Spread Solution Concentration

Tachimoto

Ohata

Takeno³

et al. 2023

Langmuir

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Metal–organic frameworks (MOFs)crystalline coordination polymerswith unique characteristics such as structural designability accompanied by tunable electronic properties and intrinsic uniform nanopores have become the platform for applications in diverse scientific areas ranging from nanotechnology to energy/environmental sciences. To utilize the superior features of MOF in potential applications, the fabrication and integration of thin films are of importance and have been actively sought. Especially, downsized MOFs into nanosheets can act as ultimately thin functional components in nanodevices and potentially display unique chemical/physical properties rarely seen in bulk MOFs. Assembling nanosheets by aligning amphiphilic molecules at the air/liquid interface has been known as the Langmuir technique. By utilizing the air/liquid interface as a reaction field between metal ions and organic ligands, MOFs are readily formed into the nanosheet state. The expected features in MOF nanosheets including electrical conduction largely depend on the nanosheet characteristics such as lateral size, thickness, morphology, crystallinity, and orientation. However, their control has not been achieved as yet. Here, we demonstrate how changing the concentration of a ligand spread solution can modify the assembly of MOF nanosheets, composed of 2,3,6,7,10,11-hexaiminotriphenylene (HITP) and Ni2+ ions (HITP-Ni-NS), at the air/liquid interface. A systematic increase in the concentration of the ligand spread solution leads to the enlargement of both the lateral size and the thickness of the nanosheets while retaining their perfect alignment and preferred orientation. On the other hand, at much higher concentrations, we find that unreacted ligand molecules are included in HITP-Ni-NS, introducing disorder in HITP-Ni-NS. These findings can develop further sophisticated control of MOF nanosheet features, accelerating fundamental and applied studies on MOFs.

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Characterizing and Tuning the Properties of Polydiacetylene Films for Sensing Applications

Cited by 6 publications

References 53 publications

Tracking Mechanical Stress and Cell Migration with Inexpensive Polymer Thin‐Film Sensors

Tracking Mechanical Stress and Cell Migration with Inexpensive Polymer Thin‐Film Sensors

Bio‐Inspired Polydiacetylene Vesicles for Controlling Stimulus Sensitivity

Assembling Triphenylene-Based Metal–Organic Framework Nanosheets at the Air/Liquid Interface: Modification by Tuning the Spread Solution Concentration

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