scholarly journals Osmotic stress and pore nucleation in charged biological nanoshells and capsids

Soft Matter ◽  
2020 ◽  
Vol 16 (9) ◽  
pp. 2390-2405
Author(s):  
Thiago Colla ◽  
Amin Bakhshandeh ◽  
Yan Levin
Keyword(s):  
Aqueous Solution ◽  
Osmotic Stress ◽  
Mechanical Stability ◽  
Model System ◽  
Osmotic Equilibrium ◽  
Pore Nucleation

A model system is proposed to investigate the osmotic equilibrium and mechanical stability of biological spherical-like nanoshells in contact with an aqueous solution with added dissociated electrolyte of a given concentration.

scholarly journals 3D Ultrasensitive Polymers-Plasmonic Hybrid Flexible Platform for In-Situ Detection

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 392 ◽  
Author(s):  
Meimei Wu ◽  
Chao Zhang ◽  
Yihan Ji ◽  
Yuan Tian ◽  
Haonan Wei ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Composite Structures ◽  
Mechanical Stability ◽  
Hot Spot ◽  
Incident Light ◽  
Uniform Space ◽  
Space Distribution ◽  
Pmma Film ◽  
Sers Substrate

This paper introduces a three-dimensional (3D) pyramid to the polymers-plasmonic hybrid structure of polymethyl methacrylate (PMMA) composite silver nanoparticle (AgNPs) as a higher quality flexible surface-enhanced Raman scattering (SERS) substrate. Benefiting from the effective oscillation of light inside the pyramid valley could provide wide distributions of 3D “hot spots” in a large space. The inclined surface design of the pyramid structure could facilitate the aggregation of probe molecules, which achieves highly sensitive detection of rhodamine 6G (R6G) and crystal violet (CV). In addition, the AgNPs and PMMA composite structures provide uniform space distribution for analyte detection in a designated hot spot zone. The incident light can penetrate the external PMMA film to trigger the localized plasmon resonance of the encapsulated AgNPs, achieving enormous enhancement factor (~ 6.24 × 10 8 ). After undergoes mechanical deformation, the flexible SERS substrate still maintains high mechanical stability, which was proved by experiment and theory. For practical applications, the prepared flexible SERS substrate is adapted to the in-situ Raman detection of adenosine aqueous solution and the methylene-blue (MB) molecule detection of the skin of a fish, providing a direct and nondestructive active-platform for the detecting on the surfaces with any arbitrary morphology and aqueous solution.

scholarly journals Studying the concentration dependence of the aggregation number of a micellar model system by SANS

Soft Matter ◽  
2015 ◽  
Vol 11 (21) ◽  
pp. 4208-4217 ◽  
Author(s):  
Matthias Amann ◽  
Lutz Willner ◽  
Jörg Stellbrink ◽  
Aurel Radulescu ◽  
Dieter Richter
Keyword(s):  
Aqueous Solution ◽  
Concentration Dependence ◽  
Aggregation Number ◽  
Model System ◽  
Polymer Micelles ◽  
P Concentration

Concentration dependence of the aggregation number of n-octacosanyl-PEO polymer micelles in aqueous solution determined by SANS experiments.

Inorganic Nanocrystals with Dendrimer Templates: Mesoscopic Model System and Route to New Nanocomposites

2001 ◽  
Vol 676 ◽  
Author(s):  
Franziska Gröhn ◽  
Barry J. Bauer ◽  
Eric J. Amis
Keyword(s):  
Aqueous Solution ◽  
Organic Solvent ◽  
Cadmium Sulfide ◽  
Pamam Dendrimers ◽  
Model System ◽  
Hybrid Structures ◽  
Host System ◽  
Hydrophobically Modified ◽  
Dendrimer Generation ◽  
Inorganic Nanocrystals

ABSTRACTWe investigate nanostructures that are formed when dendrimers act as hosts. Poly(amidoamine) (PAMAM) dendrimers can be used as templates for inorganic nanocrystals, both in aqueous solution1-3 and in a polymeric matrix4. SANS, SAXS and TEM are used to characterize the resulting hybrid structures. Different inorganic colloids like noble metal and cadmium sulfide colloids are studied1,2. With increasing dendrimer generation, we observe a transition from low molecular colloid stabilizing to an effective polymer templating in terms of a “host-guest nanoscale synthesis”. For these higher generation dendrimers, inorganic colloids are formed inside single dendrimer molecules and the size of the nanocrystal can precisely be controlled by the dendrimer generation (“fixed loading law”). Hydrophobically modified dendrimers in organic solvent represent a further, different kind of host system that we have investigated using scattering methods5.

Bonding and Stability of Metal/Ceramic Interfaces

1998 ◽  
Vol 4 (S2) ◽  
pp. 768-769
Author(s):  
U. Alber ◽  
R. Schweinfest ◽  
M. Riihle
Keyword(s):  
Materials Science ◽  
Mechanical Stability ◽  
Model System ◽  
Interface Model ◽  
Bending Tests ◽  
Four Point Bending ◽  
Analytical Electron ◽  
Metal Ceramic ◽  
Pure Cu ◽  
Ceramic Interfaces

Metal/ceramic interfaces play a crucial role in materials science and for various industrial purposes. In technical applications these interfaces are often exposed to high temperatures and different atmospheres. This often results in a change of the mechanical stability via the morphology and electronic structure of the interfaces. We present a comprehensive analytical electron microcopy (AEM) and fracture mechanics study of this connection on a metal/ceramic-interface model system: Cu/ α-Al2O3.The specimens were produced by UHV diffusion bonding of bulk Cu to (α-Al2O3 single crystals. Two different Cu materials were used, either pure Cu (noted: Cu) or Cu containing 83±12 ppm oxygen (noted: Cu(O)). After bonding the interfaces were annealed in an oxygen partial pressure at 1000°C between 20 and 120 h. Four point bending tests showed an increase of the fracture energy for the Cu(O)/α -Al2O3-interfaces compared to the Cu(O)/α-Al2O3-interfaces by a factor of 5±2.

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