Spontaneous Injection of Polymer into a Spherical Cavity from a Narrow Tube

Wang, Chao; Wu, Fan; Zhao, Bin; Chen, Ying-Cai; Luo, Meng‐Bo

doi:10.1021/acs.macromol.9b02645

Cited by 6 publications

(5 citation statements)

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“…It is worth noting that the difference between the flat plate and the channel cases is significant and complicated. Namely, according to the literature, − there is no restriction when the polymer chains come to the surface of the plate, but for the cylindrical channel, the polymer chains are supposed to naturally escape due to the entropy loss when the chain size is on the order of magnitude of channel size. Such an escape effect in the cylindrical channel needs to be further clarified in the future by theoretical consideration and computational simulation.…”

Section: Results and Discussionmentioning

confidence: 99%

Adsorption Kinetics of Poly(benzyl acrylate) Chains onto Alumina Interface during the Flow-Driven Translocation through Cylindrical Nanochannels

Wang,

Zhou,

Zheng

et al. 2023

Langmuir

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In this work, the adsorption kinetics of the PBA N /AAO system under flushing condition has been investigated, where PBA N and AAO represent poly(benzyl acrylate) and anodic alumina oxide (AAO, average pore radius R 0 ≈ 10 nm) nanochannel, respectively. Our specially designed double-pump flushing system is proved to eliminate the overshoot phenomenon and in situ monitor transmembrane pressure (ΔP) as a function of flushing time (t) and flow rate (Q), which gives the effective pore radius (R), cross-sectional coverage factor (χ = [1 − (R/R 0 ) 2 ]), and characteristic ratio (r c ) of the increments of χ during each adsorption/desorption cycle at a given bulk solution concentration (C bulk ). Our findings include: (1) by gradient increasing C bulk from 10 to 200 mg/L at Q = 10 mL/h, the shortest PBA 40 displays a saturation adsorption behavior when C bulk ≥ 80 mg/L and t ≥ 2000 s, which agrees well with the prediction of blob model, whereas for the longer PBA N chains, the chain length (N) and concentrationdependent adsorption tendency get stronger as N increases from 40 to 620 at t ≥ 2000 s, in particular, R/R 0 ∼ N −0.20 is observed at C bulk = 140 mg/L; (2) by focusing on the platform χ in the saturation adsorption regime (χ sat ), the longer PBA N displays a stronger adsorption trend with partially reversible feature at Q = 5.0 mL/h, namely, as N increases from 40 to 620, χ sat increases from 0.15 to 0.83 at C bulk = 100 mg/L, where r c changes from 0.25 ± 0.10 to 0.80 ± 0.10 as the adsorption/desorption flushing cycle increases from 1 to 8 at C bulk = 100 mg/L; (3) by further assuming a solvent nonpenetrating and nondraining adsorption layer, χ sat determined in the case of curved surface can be comparable to the physical meaning of adsorption thickness (Δ ad ) in the case of flat-surface adsorption, and the fitting result indicates χ sat ∼ Δ ad ∼ N 0.58 , falling between Δ ad ∼ N 1/2 and Δ ad ∼ N 1.0 predicted by the mean-field and scaling theories for real multichain adsorption, respectively. Overall, the present work not only clarifies some controversies but also provides unambiguous evidence supporting the existence of tightly adsorbed internal and loosely adsorbed external layers.

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Section: Results and Discussionmentioning

confidence: 99%

Adsorption Kinetics of Poly(benzyl acrylate) Chains onto Alumina Interface during the Flow-Driven Translocation through Cylindrical Nanochannels

Wang,

Zhou,

Zheng

et al. 2023

Langmuir

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“…Figure 2 shows the dependence of the complete injection probability P in on the radius of the sphere R for different polymer lengths N at f = 0.5. We can see two polymer states: a partial injection state with P in roughly zero at small R and a complete injection state with P in roughly 1 at large R. There is an obvious sharp transition from the partial injection state to the complete injection state at a special R. To give approximately the radius of the spherical cavity where the transition occurs, we here define the transition radius R C at which P in = 0.5, [59] as shown in Fig. 2, and the corresponding effective transition radius is R eC = R C − 0.56.…”

Section: Complete Injection Probability and Transition Radius Of The ...mentioning

confidence: 99%

“…In our recent work, we have studied the spontaneous injection of a flexible polymer into a spherical cavity from a long channel. [59] It was found that there is an obvious transition for polymer from the partial injection to the complete injection with increasing the radius of the cavity. However, the transition is not clear yet for forced cases.…”

Section: Introductionmentioning

confidence: 99%

Driven injection of a polymer into a spherical cavity: A Langevin dynamics simulation study*

Wang¹,

Wu²,

Yang³

et al. 2021

Chinese Phys. B

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The injection of a self-avoiding flexible polymer into a spherical cavity under a driving force is studied by using Langevin dynamics simulation. For given polymer length (N) and driving force ( f ), the polymer can be completely injected into the cavity only when the radius of the cavity is larger than a transition radius (R eC ). The dependence of R eC on N and f can be described by a scaling relation R eC ∝ N 1/3 f −δ . The value of δ changes from 4/15 in the small f region to 1/6 in the moderate f region due to the screening of the excluded-volume interaction between monomers. We find the complete injection time (τ) decreases monotonously with increasing the cavity radius or decreasing the polymer length. The simulation results are in good agreement with the theoretical predictions from the free energy analysis and a simple kinetic model.

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“…An important factor that affects the translocation or ejection dynamics is the geometry of the trans side, i.e. the available space for the polymer in the trans side, which can be semispace [3,, confined in one dimension [33][34][35], or confined in two and three dimensions [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. The latter case corresponds to the packing/ejection of a DNA or RNA of a virus into/from a capsid.…”

Section: Introductionmentioning

confidence: 99%

Translocation of an active polymer into a two dimensional circular nano-container

Rezaie-Dereshgi

Khalilian

Sarabadani

2023

J. Phys.: Condens. Matter

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Translocation dynamics of an active semi-flexible polymer through a nano-pore into a rigid two dimensional circular nano-container has been studied by using Langevin dynamics simulations. The results show that the force exponent $\beta$, for regime of small nano-container radius, i.e. $R \ll R_{\textrm{g}}$, where $R_{\textrm{g}}$ is the gyration radius of the passive semi-flexible polymer in two dimensional free space, is $\beta=-1$, while for large values of $R \gg R_{\textrm{g}}$ the asymptotic value of the force exponent is $\beta \approx -0.93$. The force exponent is defined by the scaling form of the average translocation time $\langle \tau \rangle \propto F_{\textrm{sp}}^{\beta}$, where $F_{\textrm{sp}}$ is the self-propelling force. Moreover, using the definition of the turning number (number of net turns of the polymer configuration) for the polymer inside the cavity, it has been found that at the end of translocation process for small value of $R$ and in the strong force limit the polymer configuration is more regular than the case in which the value of $R$ is large or the force is weak.

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Spontaneous Injection of Polymer into a Spherical Cavity from a Narrow Tube

Cited by 6 publications

References 50 publications

Adsorption Kinetics of Poly(benzyl acrylate) Chains onto Alumina Interface during the Flow-Driven Translocation through Cylindrical Nanochannels

Adsorption Kinetics of Poly(benzyl acrylate) Chains onto Alumina Interface during the Flow-Driven Translocation through Cylindrical Nanochannels

Driven injection of a polymer into a spherical cavity: A Langevin dynamics simulation study*

Translocation of an active polymer into a two dimensional circular nano-container

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