Self-assembly of guanosine and deoxy-guanosine into hydrogels: monovalent cation guided modulation of gelation, morphology and self-healing properties

2014 ◽  
Vol 2 (30) ◽  
pp. 4802-4810 ◽  
Author(s):  
Bimalendu Adhikari ◽  
Afzal Shah ◽  
Heinz-Bernhard Kraatz
Keyword(s):  
Metal Ions ◽  
Self Assembly ◽  
Monovalent Cation ◽  
Purine Nucleoside ◽  
Self Healing

The gelation, morphological, fluorescence and thixotropic properties of the purine nucleoside based hydrogels were found to modulate with metal ions.

scholarly journals Influence of Metal Ions on Model Protoamphiphilic Vesicular Systems: Insights from Laboratory and Analogue Studies

Life ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1413
Author(s):  
Manesh Prakash Joshi ◽  
Luke Steller ◽  
Martin J. Van Kranendonk ◽  
Sudha Rajamani
Keyword(s):  
Fatty Acid ◽  
Metal Ions ◽  
Self Assembly ◽  
Metal Ion ◽  
Hot Spring ◽  
Divalent Cations ◽  
Microscopic Analysis ◽  
Monovalent Cation ◽  
The Self ◽  
Vesicle Formation

Metal ions strongly affect the self-assembly and stability of membranes composed of prebiotically relevant amphiphiles (protoamphiphiles). Therefore, evaluating the behavior of such amphiphiles in the presence of ions is a crucial step towards assessing their potential as model protocell compartments. We have recently reported vesicle formation by N-acyl amino acids (NAAs), an interesting class of protoamphiphiles containing an amino acid linked to a fatty acid via an amide linkage. Herein, we explore the effect of ions on the self-assembly and stability of model N-oleoyl glycine (NOG)-based membranes. Microscopic analysis showed that the blended membranes of NOG and Glycerol 1-monooleate (GMO) were more stable than pure NOG vesicles, both in the presence of monovalent and divalent cations, with the overall vesicle stability being 100-fold higher in the presence of a monovalent cation. Furthermore, both pure NOG and NOG + GMO mixed systems were able to self-assemble into vesicles in natural water samples containing multiple ions that were collected from active hot spring sites. Our study reveals that several aspects of the metal ion stability of NAA-based membranes are comparable to those of fatty acid-based systems, while also confirming the robustness of compositionally heterogeneous membranes towards high metal ion concentrations. Pertinently, the vesicle formation by NAA-based systems in terrestrial hot spring samples indicates the conduciveness of these low ionic strength freshwater systems for facilitating prebiotic membrane-assembly processes. This further highlights their potential to serve as a plausible niche for the emergence of cellular life on the early Earth.

Extremely Tough and Healable Elastomer Realized via Reducing the Crystallinity of Rigid Domain

2021 ◽  
Author(s):  
Chong Xing ◽  
Haomin Wu ◽  
Ruichun Du ◽  
Qiuhong Zhang ◽  
Xudong Jia
Keyword(s):  
Metal Ions ◽  
Self Healing ◽  
High Toughness

We propose a new concept of “toughening the rigid” by adding metal ions to sacrifice the crystallinity of the rigid domain, which makes the elastomers with high toughness and self-healing...

Topological liquid crystal superstructures as structured light lasers

2021 ◽  
Vol 118 (49) ◽  
pp. e2110839118
Author(s):  
Miha Papič ◽  
Urban Mur ◽  
Kottoli Poyil Zuhail ◽  
Miha Ravnik ◽  
Igor Muševič ◽  
...  
Keyword(s):  
Self Assembly ◽  
Soft Matter ◽  
Structured Light ◽  
Topological Defects ◽  
Photonic Devices ◽  
Light Polarization ◽  
Self Healing ◽  
Fabry Perot ◽  
Self Assembled ◽  
External Stimuli

Liquid crystals (LCs) form an extremely rich range of self-assembled topological structures with artificially or naturally created topological defects. Some of the main applications of LCs are various optical and photonic devices, where compared to their solid-state counterparts, soft photonic systems are fundamentally different in terms of unique properties such as self-assembly, self-healing, large tunability, sensitivity to external stimuli, and biocompatibility. Here we show that complex tunable microlasers emitting structured light can be generated from self-assembled topological LC superstructures containing topological defects inserted into a thin Fabry–Pérot microcavity. The topology and geometry of the LC superstructure determine the structuring of the emitted light by providing complex three-dimensionally varying optical axis and order parameter singularities, also affecting the topology of the light polarization. The microlaser can be switched between modes by an electric field, and its wavelength can be tuned with temperature. The proposed soft matter microlaser approach opens directions in soft matter photonics research, where structured light with specifically tailored intensity and polarization fields could be designed and implemented.

Self assembly of a tren-derivative hydrogenated Schiff base with transition metal ions: syntheses, crystal structures and photoluminescent properties

CrystEngComm ◽  
2012 ◽  
Vol 14 (8) ◽  
pp. 2879 ◽  
Author(s):  
Yuehong Wen ◽  
Tianlu Sheng ◽  
Qilong Zhu ◽  
Shengmin Hu ◽  
Chunhong Tan ◽  
...  
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Ions ◽  
Crystal Structures ◽  
Self Assembly ◽  
Transition Metal Ions

Facile Synthesis of Graphene-Based Aerogels and Their Applications for Adsorption of Heavy Metal Ions

2019 ◽  
Vol 18 (02) ◽  
pp. 1850019
Author(s):  
Huiyuan Yu ◽  
Jiayi Zhu ◽  
Hongbo Ren ◽  
Shuxin Liu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Self Assembly ◽  
Heavy Metal Ions ◽  
Three Dimensional ◽  
Annealing Process ◽  
Interconnected Network ◽  
Facile Synthesis ◽  
Thermal Annealing Process ◽  
Highly Porous

Graphene-based aerogels with a three-dimensional interconnected network were fabricated via the hydrothermal self-assembly and thermal-annealing process. The aerogels were characterized by means of scanning electron microscopy and atomic absorption spectroscopy. The graphene-based aerogels showed highly porous structure and adsorption capacity for heavy metal ions. Thus, they would be the promising materials for removal of heavy metal ions from water.

scholarly journals Self-healing Co3O4@Fe3O4/cellulose Blend Membranes Efficient Degrade Perfluorooctanoic Acid in the Visible Light-driven Photo-fenton System

2021 ◽  
Author(s):  
Wenqiang Chen ◽  
Chen Hou ◽  
Yang Wang ◽  
Linhui Fu ◽  
Sufeng Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Self Assembly ◽  
Pure Water ◽  
Reaction System ◽  
Degradation Pathway ◽  
Cellulose Solution ◽  
Self Healing ◽  
Active Constituent ◽  
Visible Light Driven ◽  
Fenton System

Abstract Co3O4@Fe3O4/cellulose was synthesized by in-situ self-assembly strategy coating rod-like MOF-derived Fe3O4 with Co3O4 nanoparticles and blending with cellulose solution, further applied in the visible light-driven photo-Fenton system for PFOA degradation. In addition, Co3O4@Fe3O4/cellulose/Vitrimer was obtained to explore the application of self-healing property in photo-Fenton filed and the result turned out to be good self-healing capacity for small cracks. In comparison, Co3O4@Fe3O4/cellulose can degrade around 94.5% PFOA within 180 min in reaction system, which shows better degradation capacity than others catalyst. Moreover, Co3O4@Fe3O4/cellulose was reused by rinsing with ultra-pure water and the degradation capacity was still 80.4% after five cycles. In this system, the results of Electron paramagnetic resonance analysis (EPR) and scavenger experiment suggested that PFOA degradation was a co-dependent mechanism via photogenerated electrons, photogenerated holes (h+) and various radical species, rather than a single active constituent. The degradation pathway of PFOA also was proposed based on UHPLC-MS analysis.

Metal Ions Guided Self-assembly of Therapeutic Proteins for Controllable Release: From Random to Ordered Aggregation

2012 ◽  
Vol 30 (1) ◽  
pp. 269-279 ◽  
Author(s):  
Kai Shi ◽  
Fude Cui ◽  
Hongshu Bi ◽  
Yanbo Jiang ◽  
Hang Shi ◽  
...  
Keyword(s):  
Metal Ions ◽  
Self Assembly ◽  
Therapeutic Proteins ◽  
Controllable Release ◽  
Ordered Aggregation

Self-assembly of Amphiphilic Benzo-15-crown-5 Azoprobes in Response to Alkali Metal Ions in Water

2007 ◽  
Vol 36 (7) ◽  
pp. 880-881 ◽  
Author(s):  
Fuyuki Sato ◽  
Kouki Sakamoto ◽  
Wakako Umemoto ◽  
Takeshi Hashimoto ◽  
Takashi Hayashita
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Self Assembly ◽  
Alkali Metal Ions

Self-Healing Bilayer Lipid Membranes Formed Over Synthetic Substrates

2008 ◽  
Author(s):  
M. Austin Creasy ◽  
Donald J. Leo
Keyword(s):  
Self Assembly ◽  
Lipid Membranes ◽  
Lipid Membrane ◽  
Bilayer Lipid Membrane ◽  
Unique Property ◽  
Bilayer Lipid Membranes ◽  
Self Healing ◽  
Electrical Field ◽  
Bilayer Lipid ◽  
Recent Experimental Study

Biological systems demonstrate autonomous healing of damage and are an inspiration for developing self-healing materials. Our recent experimental study has demonstrated that a bilayer lipid membrane (BLM), also called a black lipid membrane, has the ability to self-heal after mechanical failure. These molecules have a unique property that they spontaneously self assembly into organized structures in an aqueous medium. The BLM forms an impervious barrier to ions and fluid between two volumes and strength of the barrier is dependent on the pressure and electrical field applied to the membrane. A BLM formed over an aperture on a silicon substrate is shown to self-heal for 5 pressurization failure cycles.

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