Soft matter under osmotic stress

Leonard, Michael J.; Hong, Helen; Easwar, Nalini; Strey, Helmut H.

doi:10.1016/s0032-3861(00)00903-4

Cited by 40 publications

(35 citation statements)

References 18 publications

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“…First, the polymer (PEG) is not included in the content of the formed particles [8,46,[58][59][60][61].…”

Section: Discussionmentioning

confidence: 99%

“…Second, the size (diameter) of the ds DNA LCD particle is determined by a fine balance between the free energy of these particles and their surface free energy [56,[60][61][62][63]. The bulk free energy of an LCD particle tends to increase the particle size.…”

Section: Discussionmentioning

confidence: 99%

“…The ds DNA molecule packing in the dispersion particles is determined not only by lateral interactions between the adjacent molecules at the moment of their close approaching in the PEG solution but also by the properties of this solution, though the PEG molecules do not enter into the composition of the formed dispersion particles [56,61,63].…”

Section: Discussionmentioning

confidence: 99%

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Re-entrant cholesteric phase in DNA liquid-crystalline dispersion particles

et al. 2016

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In this research, we observe and rationalize theoretically the transition from hexagonal to cholesteric packing of double-stranded (ds) DNA in dispersion particles. The samples were obtained by phase exclusion of linear ds DNA molecules from water-salt solutions of poly(ethylene glycol)-PEG-with concentrations ranging from 120 mg ml −1 to 300 mg ml −1 . In the range of PEG concentrations from 120 mg ml −1 to 220 mg ml −1 at room temperature, we find ds DNA molecule packing, typical of classical cholesterics. The corresponding parameters for dispersion particles obtained at concentrations greater than 220 mg ml −1 indicate hexagonal packing of the ds DNA molecules. However, slightly counter-intuitively, the cholesteric-like packing reappears upon the heating of dispersions with hexagonal packing of ds DNA molecules. This transition occurs when the PEG concentration is larger than 220 mg ml −1 . The obtained new cholesteric structure differs from the classical cholesterics observed in the PEG concentration range 120-220 mg ml −1 (hence, the term 're-entrant'). Our conclusions are based on the measurements of circular dichroism spectra, X-ray scattering curves and textures of liquid-crystalline phases. We propose a qualitative (similar to the Lindemann criterion for melting of conventional crystals) explanation of this phenomenon in terms of partial melting of so-called quasinematic layers formed by the DNA molecules. The quasinematic layers change their spatial orientation as a result of the competition between the osmotic pressure of the

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“…First, the polymer (PEG) is not included in the content of the formed particles [8,46,[58][59][60][61].…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Re-entrant cholesteric phase in DNA liquid-crystalline dispersion particles

et al. 2016

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“…[12][13][14][15][16][17] Complexes formed between flexible, highly charged polyelectrolytes and oppositely charged surfactants at stoichiometric charge ratios have been of particular experimental interest, since they often form water-insoluble complexes possessing longrange nanoscopic order. [18][19][20][21][22][23][24][25] While purely electrostatic interactions undoubtedly play a role during complexation, counterion release is believed to be the major driving force for the selfassembly process in these and other highly charged systems. [26][27][28] Prior to complexation, the polyelectrolyte and surfactant counterions are restricted to regions close to the surfaces of both the surfactant micelles and the polyelectrolyte chains, a phenomenon known as Manning condensation.…”

Section: Introductionmentioning

confidence: 99%

Phase Diagrams of Stoichiometric Polyelectrolyte−Surfactant Complexes

Leonard

Strey

2003

Macromolecules

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“…12,17,18 An LCD (or CLCD) particle cannot be taken in hand, seen or placed on the surface of a membrane filter since, in the absence of the critical osmotic pressure of the solution, the spatial DNA molecule packing must change so that the DNA molecules will transform from the condensed (liquid-crystalline) state into the initial isotropic one.…”

Section: Properties Of Dna Liquid-crystalline Dispersion Particlesmentioning

confidence: 99%

Physicochemical and nanotechnological approaches to the design of 'rigid' spatial structures of DNA

Yevdokimov¹,

Salyanov²,

Skuridin³

et al. 2015

Russ. Chem. Rev.

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In recent years, many studies have focused on the design of new spatial structures based on linear double-stranded (ds) DNA molecules considered as a functional polymer (see, e.g., 1, 2 ). However, DNA hydrogels rather than spatial structures are often used in practice. 3 Double-stranded DNA hydrogels can be obtained, in particular, through creation of artificial cross-links between ds-DNA molecules, 4 formation of complexes with polyvalent cations (Ca 2+ , Mg 2+ , Co 2+ , Ni 2+ , Fe 2+ , Al 3+ ), 5, 6 cryopolymerization 7 or exposure to UV light. The ds-DNA hydrogels are macroscopic assemblies of irregularly crosslinked and disorderly arranged ds-DNA molecules. In hydrogels, ds-DNA molecules retain many of their inherent Yu M Yevdokimov Doctor of Chemical Sciences, Professor, Chief Researcher of the IMB RAS. Telephone: (7-499) 135 97 20, e-mail: yevdokim@eimb.ru V I Salyanov Candidate of Chemical Sciences, Senior Researcher of the same institute. Telephone: (7-499) 135 97 20, e-mail: vsalyanov@yandex.ru S G Skuridin Doctor of Biological Sciences, Senior Researcher of the same institute. Telephone: (7-499) 135 97 20, e-mail: lancet-bio@bk.ru E V Shtykova Candidate of Biological Sciences, Senior Researcher of the IC RAS. Telephone: (7-499) 135 40 20,

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Soft matter under osmotic stress

Cited by 40 publications

References 18 publications

Re-entrant cholesteric phase in DNA liquid-crystalline dispersion particles

Re-entrant cholesteric phase in DNA liquid-crystalline dispersion particles

Phase Diagrams of Stoichiometric Polyelectrolyte−Surfactant Complexes

Physicochemical and nanotechnological approaches to the design of 'rigid' spatial structures of DNA

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