scholarly journals Stimuli-responsive metal-directed self-assembly of a ring-in-ring complex

2016 ◽  
Vol 45 (29) ◽  
pp. 11611-11615 ◽  
Author(s):  
Cristina Alvariño ◽  
Carlos Platas-Iglesias ◽  
Víctor Blanco ◽  
Marcos D. García ◽  
Carlos Peinador ◽  
...  
Keyword(s):  
Self Assembly ◽  
Ring Structure ◽  
Stimuli Responsive ◽  
Medium Polarity ◽  
Ring Complex

The threading and unthreading process of a dinuclear metallacycle into a ring-in-ring structure can be controlled by temperature, dilution, and medium polarity.

Sticky ends in a self-assembling ABA triblock copolymer: the role of ureas in stimuli-responsive hydrogels

2019 ◽  
Vol 4 (1) ◽  
pp. 91-102 ◽  
Author(s):  
Ryan T. Shafranek ◽  
Joel D. Leger ◽  
Song Zhang ◽  
Munira Khalil ◽  
Xiaodan Gu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Viscoelastic Properties ◽  
Triblock Copolymer ◽  
Thermal Response ◽  
Stimuli Responsive ◽  
Self Assembling ◽  
Polymeric Hydrogels ◽  
Aba Triblock Copolymer ◽  
Responsive Hydrogels

Directed self-assembly in polymeric hydrogels allows tunability of thermal response and viscoelastic properties.

scholarly journals Luminescent Supramolecular Nano- or Microstructures Formed in Aqueous Media by Amphiphile-Noble Metal Complexes

2020 ◽  
Vol 2020 ◽  
pp. 1-24 ◽  
Author(s):  
Carmen Cretu ◽  
Loredana Maiuolo ◽  
Domenico Lombardo ◽  
Elisabeta I. Szerb ◽  
Pietro Calandra
Keyword(s):  
Noble Metal ◽  
Smart Materials ◽  
Self Assembly ◽  
Noble Metals ◽  
Photophysical Properties ◽  
Aqueous Media ◽  
Molecular Architecture ◽  
Stimuli Responsive ◽  
Panoramic View ◽  
Amphiphilic Molecules

The involvement of metal ions within the self-assembly spontaneously occurring in surfactant-based systems gives additional and interesting features. The electronic states of the metal, together with the bonds that can be established with the organic amphiphilic counterpart, are the factors triggering new photophysical properties. Moreover, the availability of stimuli-responsive supramolecular amphiphile assemblies, able to disassemble in a back-process, provides reversible switching particularly useful in novel approaches and applications giving rise to truly smart materials. In particular, small amphiphiles with an inner distribution, within their molecular architecture, of various polar and apolar functional groups, can give a wide variety of interactions and therefore enriched self-assemblies. If it is joined with the opportune presence and localization of noble metals, whose chemical and photophysical properties are undiscussed, then very interesting materials can be obtained. In this minireview, the basic concepts on self-assembly of small amphiphilic molecules with noble metals are shown with particular reference to the photophysical properties aiming at furnishing to the reader a panoramic view of these exciting problematics. In this respect, the following will be shown: (i) the principles of self-assembly of amphiphiles that involve noble metals, (ii) examples of amphiphiles and amphiphile-noble metal systems as representatives of systems with enhanced photophysical properties, and (iii) final comments and perspectives with some examples of modern applications.

scholarly journals Ferro-self-assembly: magnetic and electrochemical adaptation of a multiresponsive zwitterionic metalloamphiphile showing a shape-hysteresis effect

2021 ◽  
Vol 12 (1) ◽  
pp. 270-281
Author(s):  
Stefan Bitter ◽  
Moritz Schlötter ◽  
Markus Schilling ◽  
Marina Krumova ◽  
Sebastian Polarz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Real Time ◽  
Self Assembly ◽  
Hysteresis Effect ◽  
The Self ◽  
Self Organization ◽  
Stimuli Responsive ◽  
Optical Birefringence

The self-organization properties of a stimuli responsive amphiphile can be altered by subjecting the paramagnetic oxidized form to a magnetic field of 0.8 T and monitored in real time by coupling optical birefringence with dynamic light scattering.

scholarly journals Polymerisation-induced self-assembly (PISA) as a straightforward formulation strategy for stimuli-responsive drug delivery systems and biomaterials: recent advances

2021 ◽  
Vol 9 (1) ◽  
pp. 38-50
Author(s):  
Hien Phan ◽  
Vincenzo Taresco ◽  
Jacques Penelle ◽  
Benoit Couturaud
Keyword(s):  
Drug Delivery ◽  
Block Copolymers ◽  
Drug Release ◽  
Self Assembly ◽  
Drug Delivery Systems ◽  
Amphiphilic Block Copolymers ◽  
Stimuli Responsive ◽  
Site Specific ◽  
On Demand ◽  
Redox Agents

Stimuli-responsive amphiphilic block copolymers obtained by PISA have emerged as promising nanocarriers for enhancing site-specific and on-demand drug release in response to a range of stimuli such as pH, redox agents, light or temperature.

Self-assembly of Stimuli Responsive Coiled-coil Fibrous Hydrogels

Soft Matter ◽  
2021 ◽  
Author(s):  
Michael Meleties ◽  
Priya Katyal ◽  
Bonnie Lin ◽  
Dustin Britton ◽  
Jin Kim Montclare
Keyword(s):  
Drug Delivery ◽  
Tissue Engineering ◽  
Self Assembly ◽  
Coiled Coil ◽  
Stimuli Responsive ◽  
Tunable Properties ◽  
Stimuli Sensitive ◽  
Biomedical Fields

Owing to their tunable properties, hydrogels comprised of stimuli sensitive polymers are one of the most appealing scaffolds with applications in tissue engineering, drug delivery and other biomedical fields. We...

scholarly journals Genetic Analysis of the Salmonella FliE Protein That Forms the Base of the Flagellar Axial Structure

mBio ◽  
2021 ◽  
Author(s):  
Jordan J. Hendriksen ◽  
Hee Jung Lee ◽  
Alexander J. Bradshaw ◽  
Keiichi Namba ◽  
Fabienne F. V. Chevance ◽  
...  
Keyword(s):  
Self Assembly ◽  
Type Iii Secretion ◽  
Type Iii Secretion System ◽  
Adaptor Protein ◽  
Ring Structure ◽  
Secretion System ◽  
Dual Roles ◽  
Content Type ◽  
Bacterial Flagellum ◽  
Type Iii

The FliE component of the bacterial flagellum is the first protein secreted through the flagellar type III secretion system (fT3SS) that is capable of self-assembly into the growing bacterial organelle. The FliE protein plays dual roles in the assembly of the Salmonella flagellum as the final component of the flagellar type III secretion system (fT3SS) and as an adaptor protein that anchors the rod (drive shaft) of the flagellar motor to the membrane-imbedded MS-ring structure.

scholarly journals Biochemical reconstitutions reveal principles of human γ-TuRC assembly and function

2021 ◽  
Vol 220 (3) ◽  
Author(s):  
Michal Wieczorek ◽  
Shih-Chieh Ti ◽  
Linas Urnavicius ◽  
Kelly R. Molloy ◽  
Amol Aher ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
The Self ◽  
Dependent Manner ◽  
Guanine Nucleotide ◽  
Partial Cone ◽  
Ring Complex ◽  
Microtubule Networks ◽  
And Function

The formation of cellular microtubule networks is regulated by the γ-tubulin ring complex (γ-TuRC). This ∼2.3 MD assembly of >31 proteins includes γ-tubulin and GCP2-6, as well as MZT1 and an actin-like protein in a “lumenal bridge” (LB). The challenge of reconstituting the γ-TuRC has limited dissections of its assembly and function. Here, we report a biochemical reconstitution of the human γ-TuRC (γ-TuRC-GFP) as a ∼35 S complex that nucleates microtubules in vitro. In addition, we generate a subcomplex, γ-TuRCΔLB-GFP, which lacks MZT1 and actin. We show that γ-TuRCΔLB-GFP nucleates microtubules in a guanine nucleotide–dependent manner and with similar efficiency as the holocomplex. Electron microscopy reveals that γ-TuRC-GFP resembles the native γ-TuRC architecture, while γ-TuRCΔLB-GFP adopts a partial cone shape presenting only 8–10 γ-tubulin subunits and lacks a well-ordered lumenal bridge. Our results show that the γ-TuRC can be reconstituted using a limited set of proteins and suggest that the LB facilitates the self-assembly of regulatory interfaces around a microtubule-nucleating “core” in the holocomplex.

Photo- and Thermo-Dual-Responsive Organic/Inorganic Hybrid Materials

2013 ◽  
Vol 538 ◽  
pp. 181-184 ◽  
Author(s):  
Xin De Tang ◽  
Ye Chen ◽  
Fa Qi Yu ◽  
Mei Shan Pei
Keyword(s):  
Block Copolymer ◽  
Hybrid Materials ◽  
Self Assembly ◽  
Polymeric Materials ◽  
Stimuli Responsive ◽  
Inorganic Hybrid ◽  
Dual Responsive ◽  
Hexyl Methacrylate ◽  
Poly Ethylene ◽  
Copolymer Poly

Organic/inorganic hybrid materials based upon stimuli-responsive copolymers have attracted an inceasing attention. Compared with the polymeric materials, these hybrid materials can form aggregates in aqueous solution with much more stable shape-persistance due to the inorganic structure, which facilitate the mass delivery and long-term life. A novel hybrid material based on a new reactive block copolymer, poly(ethylene oxide)-block-poly{3-(trimethoxysilyl)propyl methacrylate-co-N-isopropylacrylamide-co-6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate} [PEO-P(TMSPMA-NIPAM-AzoMA)] was synthesized via atom transfer radical polymerization (ATRP). The vesicles were obtained by self-assembly of the resulting block copolymer in a selective solvent, and then the PTMSPMA block was subjected to hydrolysis and polycondensation reaction to fix vesicle wall in the presence of triethylamine as a catalyst. The photo- and thermo- dual-responsive properties of the vesicles were investigated.

scholarly journals Aqueous interfacial gels assembled from small molecule supramolecular polymers

2017 ◽  
Vol 8 (2) ◽  
pp. 1350-1355 ◽  
Author(s):  
Alexander S. Groombridge ◽  
Aniello Palma ◽  
Richard M. Parker ◽  
Chris Abell ◽  
Oren A. Scherman
Keyword(s):  
Small Molecules ◽  
Small Molecule ◽  
Self Assembly ◽  
Hyperbranched Polymer ◽  
Soft Matter ◽  
Supramolecular Polymers ◽  
Supramolecular Network ◽  
Self Healing ◽  
Liquid Interfaces ◽  
Stimuli Responsive

The successful self-assembly of a stimuli-responsive aqueous supramolecular hyperbranched polymer from small molecules and the macrocyclic host cucurbit[8]uril (CB[8]) is reported. This self-healing supramolecular network can act as a soft matter barrier at liquid–liquid interfaces.

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