scholarly journals How faceted liquid droplets grow tails

2016 ◽  
Vol 113 (3) ◽  
pp. 493-496 ◽  
Author(s):  
Shani Guttman ◽  
Zvi Sapir ◽  
Moty Schultz ◽  
Alexander V. Butenko ◽  
Benjamin M. Ocko ◽  
...  
Keyword(s):  
Melting Point ◽  
Interfacial Tension ◽  
Everyday Life ◽  
Self Assembly ◽  
Liquid Droplets ◽  
Scale Elasticity ◽  
Dispersed Oil ◽  
Molecular Scale ◽  
Future Technologies ◽  
Shape Changes

Liquid droplets, widely encountered in everyday life, have no flat facets. Here we show that water-dispersed oil droplets can be reversibly temperature-tuned to icosahedral and other faceted shapes, hitherto unreported for liquid droplets. These shape changes are shown to originate in the interplay between interfacial tension and the elasticity of the droplet’s 2-nm-thick interfacial monolayer, which crystallizes at some T = Ts above the oil’s melting point, with the droplet’s bulk remaining liquid. Strikingly, at still-lower temperatures, this interfacial freezing (IF) effect also causes droplets to deform, split, and grow tails. Our findings provide deep insights into molecular-scale elasticity and allow formation of emulsions of tunable stability for directed self-assembly of complex-shaped particles and other future technologies.

scholarly journals Synthesis of aminated polystyrene and its self-assembly with nanoparticles at oil/water interface

e-Polymers ◽  
2020 ◽  
Vol 20 (1) ◽  
pp. 317-327
Author(s):  
Chenliang Shi ◽  
Ling Lin ◽  
Yukun Yang ◽  
Wenjia Luo ◽  
Maoqing Deng ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Self Assembly ◽  
Carbon Dots ◽  
Chain Transfer ◽  
Functionalized Polymers ◽  
Amino Groups ◽  
One Dimensional ◽  
Reversible Addition ◽  
Oil Water ◽  
Chain Transfer Polymerization

AbstractThe influence of density of amino groups, nanoparticles dimension and pH on the interaction between end-functionalized polymers and nanoparticles was extensively investigated in this study. PS–NH2 and H2N–PS–NH2 were prepared using reversible addition–fragmentation chain transfer polymerization and atom transfer radical polymerization. Zero-dimensional carbon dots with sulfonate groups, one-dimensional cellulose nanocrystals with sulfate groups and two-dimensional graphene with sulfonate groups in the aqueous phase were added into the toluene phase containing the aminated PS. The results indicate that aminated PS exhibited the strongest interfacial activity after compounding with sulfonated nanoparticles at a pH of 3. PS ended with two amino groups performed better in reducing the water/toluene interfacial tension than PS ended with only one amino group. The dimension of sulfonated nanoparticles also contributed significantly to the reduction in the water/toluene interfacial tension. The minimal interfacial tension was 4.49 mN/m after compounding PS–NH2 with sulfonated zero-dimensional carbon dots.

Advanced emulsions via noncovalent interaction-mediated interfacial self-assembly

2018 ◽  
Vol 54 (25) ◽  
pp. 3174-3177 ◽  
Author(s):  
Songling Han ◽  
Huijie An ◽  
Hui Tao ◽  
Lanlan Li ◽  
Yuantong Qi ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Interfacial Tension ◽  
Self Assembly ◽  
Noncovalent Interaction ◽  
Water Interface ◽  
Oil Water

The traditional emulsification theory is enriched by a self-assembly approach, in which hydrophilic copolymers with one block exhibiting electrostatic or hydrogen-bonding forces with the oil phase self-assemble at the oil–water interface, thereby reducing interfacial tension and forming emulsions.

scholarly journals Molecular Assembly and Self-Assembly: Molecular Nanoscience for Future Technologies

2002 ◽  
Vol 56 (10) ◽  
pp. 500-505 ◽  
Author(s):  
Michael de Wild ◽  
Simon Berner ◽  
Hitoshi Suzuki ◽  
Luca Ramoino ◽  
Alexis Baratoff ◽  
...  
Keyword(s):  
Self Assembly ◽  
Molecular Assembly ◽  
Future Technologies

scholarly journals “Am I representative (of my age)? No, I’m not”—Attitudes to technologies and technology development differ but unite individuals across rather than within generations

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0250425
Author(s):  
Sofi Fristedt ◽  
Samantha Svärdh ◽  
Charlotte Löfqvist ◽  
Steven M. Schmidt ◽  
Susanne Iwarsson
Keyword(s):  
Everyday Life ◽  
Technology Development ◽  
Monitoring Systems ◽  
Three Generations ◽  
Digital Services ◽  
Home Based ◽  
Different Types ◽  
Qualitative Descriptive ◽  
Future Technologies ◽  
User Perspectives

While a broad spectrum of technologies is integrated in everyday life and routines, most research on ageing, health and technology has focused on attitudes toward and adoption of digital technologies including e-health, or home based monitoring systems. The aim of this study was to explore differences and similarities in attitudes and experiences with different types of technologies and development within and between three generations. We applied a qualitative, descriptive design and recruited a purposeful sample of participants from three generations (30–39, 50–59, 70–79 year old). The 25 participants took part in 3 x 2 focus groups. Forming four categories, the findings show that technologies enable as well as complicate everyday life. Participants expressed trust as well as uncertainty about risks when using technology and stated that use of digital services is required while support is limited. They identified that technology development is inevitable but not always in the service of users. In conclusion, experiences of and attitudes towards technologies and technology development are not limited to generation; perspectives sometimes unite individuals across rather than within generations. Thus future technologies and technology development, as well as services and policies aiming to support the use of said technologies should consider individual user perspectives including needs, desires, beliefs or goals neglected in the existing technology models, and involve users beyond generations defined by chronological age. Such strategies are likely to be more successful in supporting development of technologies usable for all.

scholarly journals TDP-43 oligomers detected as initial intermediate species during aggregate formation

2018 ◽  
Author(s):  
Rachel L. French ◽  
Ashley N. Reeb ◽  
Himani Aligireddy ◽  
Niraja Kedia ◽  
Dhruva D. Dhavale ◽  
...  
Keyword(s):  
Self Assembly ◽  
Rna Binding ◽  
Initial Time ◽  
Intermediate Step ◽  
Liquid Droplets ◽  
Clinical Genetic ◽  
Lateral Sclerosis ◽  
Cytoplasmic Aggregate ◽  
Liquid Liquid Phase Separation

ABSTRACTAggregates of the RNA binding protein TDP-43 are a hallmark of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD), which are neurodegenerative disorders with overlapping clinical, genetic and pathological features. Mutations in the TDP-43 gene are causative of ALS, supporting its central role in pathogenesis. The process of TDP-43 aggregation remains poorly understood and whether this includes formation of intermediate complexes is unknown. We characterized aggregates derived from purified TDP-43 as a function of time and analyzed them under semi-denaturing conditions. Our assays identified oligomeric complexes at the initial time points prior to the formation of large aggregates, suggesting that ordered oligomerization is an intermediate step of TDP-43 aggregation. In addition, we analyzed liquid-liquid phase separation of TDP-43 and detected similar oligomeric assembly upon the maturation of liquid droplets into solid-like fibrils. These results strongly suggest that the oligomers form during the early steps of TDP-43 misfolding. Importantly, ALS-linked mutations A315T and M337V significantly accelerate aggregation, rapidly decreasing the monomeric population and shortening the oligomeric phase. We also show that the aggregates generated from purified protein seed intracellular aggregation, which is detected by established markers of TDP-43 pathology. Remarkably, cytoplasmic aggregate propagation is detected earlier with A315T and M337V and is 50% more widespread than with wild-type aggregates. Our findings provide evidence for a controlled process of TDP-43 self-assembly into intermediate structures that provide a scaffold for aggregation. This process is altered by ALS-linked mutations, underscoring the role of perturbations in TDP-43 homeostasis in protein aggregation and ALS-FTD pathogenesis.

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