Conformation of a charged vesicle

Li, Jianfeng; Zhang, Hongdong; Qiu, Feng; Yang, Yuliang; Chen, Jeff Z. Y.

doi:10.1039/c4sm02282c

Cited by 10 publications

(13 citation statements)

References 45 publications

(53 reference statements)

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“…The conformations of the charged vesicles are different from that of their uncharged counterpart and tend to elongate upon reduction in the pressure inside, which is in agreement with previous studies of charged membranes. 17,27 From Fig. 2(b), it is clear that a pressure difference of ∆p = −0.003 is sufficient to induce shape transformations in charged vesicles.…”

Section: A Vesicle Without Induced Curvaturementioning

confidence: 99%

“…We use the Dynamical Triangulation Monte Carlo (DTMC) method to explore the shape deformations under various electrostatic conditions. 16 Similar methods have been previously used to study the shape changes charged vesicle 17 and colloid membrane interactions. 18 Electrostatics is incorporated either via bare Coulomb or screened Coulomb interactions.…”

Section: Introductionmentioning

confidence: 99%

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Curvature inducing macroion condensation driven shape changes of fluid vesicles

Sreeja

Ipsen

Kumar

2015

The Journal of Chemical Physics

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We study the effect of curvature inducing macroion condensation on the shapes of charged deformable fluid interfaces using dynamically triangulated Monte Carlo simulations. In the weak electrostatic coupling regime, surface charges are weakly screened and the conformations of a vesicle, with fixed spherical topology, depend on the charge-charge interaction on the surface. While in the strong coupling regime, condensation driven curvature induction plays a dominant role in determining the conformations of these surfaces. Condensation itself is observed to be dependent on the induced curvature, with larger induced curvatures favoring increased condensation. We show that both curvature generation and curvature sensing, induced by the interplay of electrostatics and curvature energy, contribute to determination of the vesicle configurations.

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Section: A Vesicle Without Induced Curvaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Curvature inducing macroion condensation driven shape changes of fluid vesicles

Sreeja

Ipsen

Kumar

2015

The Journal of Chemical Physics

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“…The actual transition region of the SEBS/ PP main oxidation can be conveniently determined from the asynchronous PCMW2D FTIR spectra. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] For an example, two temperature points at 211 and 231 °C are observed in the region of 1840−1640 cm −1 . These two points are not the real polymer transition points, but the inflection points of the spectral intensity variations in the temperature-dependent FTIR spectra.…”

Section: The Main Oxidation Region Of the Sebs/pp Blend Determined Bymentioning

confidence: 99%

“…Scientists reported many successful applications of 2D correlation infrared spectroscopy on the study of the mechanism of polymer physical or chemical processes. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] In this study, the thermal oxidation process of the SEBS/PP blend (SEBS:PP = 60:40 wt%) is investigated in detail. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TG) measurements help us to determine the onset point of the SEBS/PP oxidation and the starting temperature of the oxidative degradation.…”

Section: Introductionmentioning

confidence: 99%

Generation Mechanism of Oxidation Products during the Air Atmosphere Oxidation of SEBS/PP Blends: Tracked by 2D Correlation Infrared Spectroscopy

Liu

Zhou

Zhang

2016

Macro Chemistry & Physics

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In this paper, the generation mechanism of oxidation products during the oxidation of the polystyrene‐block‐poly(ethylene‐co‐1‐butene)‐block‐polystyrene copolymer (SEBS)/poly(propylene) (PP) blend in air atmosphere is investigated using temperature‐dependent FTIR combined with 2D correlation infrared spectroscopy. Differential scanning calorimetry, thermogravimetric analysis, and perturbation‐correlation moving‐window 2D correlation FTIR spectroscopy find three processes associated with SEBS/PP oxidative degradation. The 2D correlation analysis is used to study the sequential order of groups' movement of reactants and oxidation products involved in the main oxidation. It is found that the main oxidation starts from the molecular chains of PP and EB blocks of SEBS. It firstly forms COC structure between the molecular chains of PP and the EB blocks, resulting in the cross‐linked structure. Aliphatic ketones are formed via the β‐scission of the main chains of PP or the EB blocks. Then, aliphatic ketones are converted into aliphatic esters. After the above reactions, the S blocks of SEBS begin to oxidize. The S blocks are generated into aromatic ketones through β‐scission. The formation of lactones in the molecular chains of PP and EB blocks is followed via the radical biting back. Finally, aromatic ketones generated from the S blocks are converted into aromatic esters through the reactions of Norrish I, the radical coupling, and so on.

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“…In this paper, a charged 2D particle-vesicle system is employed to investigate endocytosis. The influences of particle size, charge density of the vesicle, area fraction of the charges, screening length and mixing free energy are studied using 2D dynamical simulations based on a discrete-variational method proposed by us [33][34][35]. It should be mentioned that most of the simulations in the current work neglect screening of the Coulomb interaction by counterions.…”

Section: Introductionmentioning

confidence: 99%

Conformations of a charged vesicle interacting with an oppositely charged particle

Duan

Zhang

et al. 2017

J Biol Phys

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Endocytotic and exocytotic processes are usually studied using particle-vesicle systems in theory, but most of them are electroneutral. Nevertheless, charged particle-vesicle systems are much closer to real biological systems. Therefore, wrapping behaviors of a negatively charged vesicle wrapping a positively charged particle are systematically investigated by a series of 2D dynamical simulations in this article. The competition between the elastic bending energy and the electrostatic energy dictates the vesicle configuration and charge distribution. It is found that only for intermediate charge concentrations and small particle sizes a vesicle can completely engulf the particle. When the charge density is high, the interaction between vesicle and particle is unexpectedly weakened by both the hardening effect of the charged membrane and the effective-transportation-frozen effect of the charged components. When the particle is strongly charged, multi-layer folding conformations are observed. These studies may provide important insights into mechanism of endocytotic and exocytotic processes in biological systems.

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Conformation of a charged vesicle

Cited by 10 publications

References 45 publications

Curvature inducing macroion condensation driven shape changes of fluid vesicles

Curvature inducing macroion condensation driven shape changes of fluid vesicles

Generation Mechanism of Oxidation Products during the Air Atmosphere Oxidation of SEBS/PP Blends: Tracked by 2D Correlation Infrared Spectroscopy

Conformations of a charged vesicle interacting with an oppositely charged particle

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