Solvent and concentration effects on highly defined, colloid-like ionic clusters in solution

2018 ◽  
Vol 20 (3) ◽  
pp. 1421-1430 ◽  
Author(s):  
Jana Eisermann ◽  
Lukas Prager ◽  
Dariush Hinderberger
Keyword(s):  
Self Assembly ◽  
Ionic Clusters ◽  
Concentration Effects

We characterize the process of ionic self-assembly involving a macrocyclic tetraimidazolium molecular box and small dianionic salts into highly defined, colloid-like ionic clusters called ionoids.

scholarly journals Concentration Effects on the Dynamics of Liquid Crystalline Self-Assembly: Time-Resolved X-ray Scattering Studies

2011 ◽  
Vol 115 (11) ◽  
pp. 2176-2183 ◽  
Author(s):  
Marcel Petri ◽  
Andreas Menzel ◽  
Oliver Bunk ◽  
Gerhard Busse ◽  
Simone Techert
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Concentration Effects ◽  
Time Resolved ◽  
X Ray ◽  
Assembly Time ◽  
X Ray Scattering ◽  
Ray Scattering

Concentration Effects on the Self-Assembly of TyrosineMolecules

2021 ◽  
Author(s):  
Hajar Nili Ahmadabadi ◽  
amir ali masoudi ◽  
SAHIN UYAVER
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Ordered Structure ◽  
Concentration Effects ◽  
High Interest ◽  
Set Up

Molecular self-assembly is an ubiquitous phenomena in which individual atoms or molecules set up an ordered structure. It is of high interest in understanding biology and a variety of diseases...

scholarly journals Tuning the shape anisotropy of loosely bound colloid-like ionic clusters in solution

2019 ◽  
Vol 21 (3) ◽  
pp. 1152-1159 ◽  
Author(s):  
Jana Eisermann ◽  
Dariush Hinderberger
Keyword(s):  
Self Assembly ◽  
Shape Anisotropy ◽  
Assembly Process ◽  
Ionic Clusters ◽  
Ionic Ratio

We characterize the influence of the ionic ratio on the dynamic self-assembly process involving a macrocyclic tetraimidazolium molecular box and small dianionic salts into highly defined, colloid-like ionic clusters in solution, called ionoids.

scholarly journals Ordering of Rods near Surfaces: Concentration Effects

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 265
Author(s):  
Dora Izzo
Keyword(s):  
Self Assembly ◽  
Recurrence Relations ◽  
Chemical Potential ◽  
Mean Field ◽  
Radius Of Curvature ◽  
Concentration Effects ◽  
Planar Case ◽  
Fixed Concentration ◽  
Infinite Region ◽  
First Order Transition

We study the orientation of rods in the neighborhood of a surface. A semi-infinite region in two different situations is considered: (i) the rods are located close to a flat wall and (ii) the rods occupy the space that surrounds a sphere. In a recent paper we investigated a similar problem: the interior of a sphere, with a fixed concentration of rods. Here, we allow for varying concentration, the rods are driven from a reservoir to the neighborhood of the surface by means of a tunable chemical potential. In the planar case, the particle dimensions are irrelevant. In the curved case, we consider cylinders with dimensions comparable to the radius of curvature of the sphere; as they come close to the surface, they have to accommodate to fill the available space, leading to a rich orientational profile. These systems are studied by a mapping onto a three-state Potts model with annealed disorder on a semi-infinite lattice; two order parameters describe the system: the occupancy and the orientation. The Hamiltonian is solved using a mean-field approach producing recurrence relations that are iterated numerically and we obtain various interesting results: the system undergoes a first order transition just as in the bulk case; the profiles do not have a smooth decay but may present a step and we search for the factors that determine their shape. The prediction of such steps may be relevant in the field of self-assembly of colloids and nanotechnology.

scholarly journals Dynamic self-assembly of ions with variable size and charge in solution

RSC Advances ◽  
2019 ◽  
Vol 9 (32) ◽  
pp. 18627-18640 ◽  
Author(s):  
Jana Eisermann ◽  
Andreas Kerth ◽  
Dariush Hinderberger
Keyword(s):  
Self Assembly ◽  
Ionic Clusters ◽  
Variable Size ◽  
Ambient Temperatures

Recently it was found that at ambient temperatures and in specific ternary solvents a cationic macrocyclic tetraimidazolium molecular box and small dianionic salts can self-assemble into highly defined, colloid-like ionic clusters, called ionoids.

Same building block, but diverse surface-confined self-assemblies: solvent and concentration effects-induced structural diversity towards chirality and achirality

2018 ◽  
Vol 20 (25) ◽  
pp. 17367-17379 ◽  
Author(s):  
Yi Hu ◽  
Shaogang Xu ◽  
Kai Miao ◽  
Xinrui Miao ◽  
Wenli Deng
Keyword(s):  
Self Assembly ◽  
Building Block ◽  
Structural Diversity ◽  
Concentration Effects

The study presents solvent and concentration effects-induced diverse chiral and achiral self-assembly nanostructures on an HOPG surface.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

The Nature of Rapidly Extracted Phycocyanin from the Blue-Green Alga Plectonema Boryanum

1971 ◽  
Vol 29 ◽  
pp. 366-367
Author(s):  
M. Kessel ◽  
R. MacColl
Keyword(s):  
Self Assembly ◽  
Analytical Ultracentrifugation ◽  
Uranyl Acetate ◽  
The Self ◽  
Major Protein ◽  
Subunit Structure ◽  
Blue Green Alga ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Cacodylate Buffer

The major protein of the blue-green algae is the biliprotein, C-phycocyanin (Amax = 620 nm), which is presumed to exist in the cell in the form of distinct aggregates called phycobilisomes. The self-assembly of C-phycocyanin from monomer to hexamer has been extensively studied, but the proposed next step in the assembly of a phycobilisome, the formation of 19s subunits, is completely unknown. We have used electron microscopy and analytical ultracentrifugation in combination with a method for rapid and gentle extraction of phycocyanin to study its subunit structure and assembly.To establish the existence of phycobilisomes, cells of P. boryanum in the log phase of growth, growing at a light intensity of 200 foot candles, were fixed in 2% glutaraldehyde in 0.1M cacodylate buffer, pH 7.0, for 3 hours at 4°C. The cells were post-fixed in 1% OsO4 in the same buffer overnight. Material was stained for 1 hour in uranyl acetate (1%), dehydrated and embedded in araldite and examined in thin sections.

Video real-time imaging of artificial membranes during freeze-drying by cryo-electron microscopy

1988 ◽  
Vol 46 ◽  
pp. 16-17
Author(s):  
Alan S. Rudolph ◽  
Ronald R. Price
Keyword(s):  
Real Time ◽  
Self Assembly ◽  
Freeze Drying ◽  
Video Capture ◽  
Drying Process ◽  
Artificial Membranes ◽  
The Past ◽  
Cryo Electron Microscopy ◽  
Spherical Structures ◽  
Capture Techniques

We have employed cryoelectron microscopy to visualize events that occur during the freeze-drying of artificial membranes by employing real time video capture techniques. Artificial membranes or liposomes which are spherical structures within internal aqueous space are stabilized by water which provides the driving force for spontaneous self-assembly of these structures. Previous assays of damage to these structures which are induced by freeze drying reveal that the two principal deleterious events that occur are 1) fusion of liposomes and 2) leakage of contents trapped within the liposome [1]. In the past the only way to access these events was to examine the liposomes following the dehydration event. This technique allows the event to be monitored in real time as the liposomes destabilize and as water is sublimed at cryo temperatures in the vacuum of the microscope. The method by which liposomes are compromised by freeze-drying are largely unknown. This technique has shown that cryo-protectants such as glycerol and carbohydrates are able to maintain liposomal structure throughout the drying process.

Biomimetic materials: An introduction

1992 ◽  
Vol 50 (2) ◽  
pp. 1020-1021 ◽  
Author(s):  
M. Sarikaya ◽  
J. T. Staley ◽  
I. A. Aksay
Keyword(s):  
Self Assembly ◽  
Structural Control ◽  
Hierarchical Structures ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Length Scale ◽  
Spider Webs ◽  
Biomimetic Materials ◽  
Synthetic Materials ◽  
All Ceramic

Biomimetics is an area of research in which the analysis of structures and functions of natural materials provide a source of inspiration for design and processing concepts for novel synthetic materials. Through biomimetics, it may be possible to establish structural control on a continuous length scale, resulting in superior structures able to withstand the requirements placed upon advanced materials. It is well recognized that biological systems efficiently produce complex and hierarchical structures on the molecular, micrometer, and macro scales with unique properties, and with greater structural control than is possible with synthetic materials. The dynamism of these systems allows the collection and transport of constituents; the nucleation, configuration, and growth of new structures by self-assembly; and the repair and replacement of old and damaged components. These materials include all-organic components such as spider webs and insect cuticles (Fig. 1); inorganic-organic composites, such as seashells (Fig. 2) and bones; all-ceramic composites, such as sea urchin teeth, spines, and other skeletal units (Fig. 3); and inorganic ultrafine magnetic and semiconducting particles produced by bacteria and algae, respectively (Fig. 4).

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