scholarly journals Polymerization-Induced Phase Segregation and Self-Assembly of Siloxane Additives to Provide Thermoset Coatings with a Defined Surface Topology and Biocidal and Self-Cleaning Properties

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1610 ◽  
Author(s):  
Jaleh Mansouri ◽  
Vi Khanh Truong ◽  
Shane MacLaughlin ◽  
David E. Mainwaring ◽  
Graeme Moad ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Self Assembly ◽  
Antimicrobial Properties ◽  
Phase Segregation ◽  
Surface Topology ◽  
Stimuli Responsive ◽  
Antibacterial Performance ◽  
Self Cleaning ◽  
Pigmented Coatings ◽  
Coating Formulation

In this work, we report on the incorporation of a siloxane copolymer additive, poly((2-phenylethyl) methylsiloxane)-co(1-phenylethyl) methylsiloxane)-co-dimethylsiloxane), which is fully soluble at room temperature, in a rapid-cure thermoset polyester coating formulation. The additive undergoes polymerization-induced phase segregation (PIPS) to self-assemble on the coating surface as discrete discoid nanofeatures during the resin cure process. Moreover, the copolymer facilitates surface co-segregation of titanium dioxide pigment microparticulate present in the coating. Depending on the composition, the coatings can display persistent superhydrophobicity and self-cleaning properties and, surprisingly, the titanium dioxide pigmented coatings that include the siloxane copolymer additive display high levels of antibacterial performance against Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa) bacteria. This antibacterial performance is believed to be associated with the unique surface topology of these coatings, which comprise stimuli-responsive discoid nanofeatures. This paper provides details of the surface morphology of the coatings and how these relates to the antimicrobial properties of the coating.

scholarly journals Surface Curing and Properties of Titanium Dioxide Self - Cleaning Ceramics

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Xiwen Liu ◽  
Yao Tong ◽  
,Jia Chen
Keyword(s):  
Titanium Dioxide ◽  
Antimicrobial Properties ◽  
Ceramic Surface ◽  
Curing Mechanism ◽  
Self Cleaning ◽  
The Relationship

In this paper, the curing mechanism of TiO2 photocatalytic film on the ceramic surface is introduced, and the relationship between photocatalysis, hydrophilicity and self-cleaning properties of TiO2 ceramics is analyzed. Finally, the mechanism of antimicrobial properties of TiO2 ceramics and its relationship with temperature were analyzed.

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.

Titanium dioxide as a photocatalyst to create self-cleaning concrete

2020 ◽  
Author(s):  
Hansaraj Dikkar ◽  
Varad Kapre ◽  
Amey Diwan ◽  
S.K. Sekar
Keyword(s):  
Titanium Dioxide ◽  
Self Cleaning

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.

One-pot synthesis of a TiO2–CdS nano-heterostructure assembly with enhanced photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (44) ◽  
pp. 34942-34948 ◽  
Author(s):  
Sayantan Mazumdar ◽  
Aninda J. Bhattacharyya
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Cadmium Sulfide ◽  
Self Assembly ◽  
Cost Effective ◽  
One Pot ◽  
One Pot Synthesis ◽  
Cost Effective Method

An unprecedented morphology of a titanium dioxide (TiO2) and cadmium sulfide (CdS) self-assembly obtained using a ‘truly’ one-pot and highly cost effective method with a multi-gram scale yield is reported here.

scholarly journals Xanthate-modified nanoTiO2 as a novel vulcanization accelerator enhancing mechanical and antibacterial properties of natural rubber

2021 ◽  
Vol 10 (1) ◽  
pp. 478-487
Author(s):  
Yu Liu ◽  
Heliang Wang ◽  
Xiwei Guo ◽  
Mingyuan Yi ◽  
Lihong Wan ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Natural Rubber ◽  
High Performance ◽  
Antibacterial Properties ◽  
Ceric Ammonium Nitrate ◽  
Rubber Matrix ◽  
Aging Effects ◽  
Antibacterial Performance ◽  
First Time ◽  
Vulcanization Accelerator

Abstract With the emerging of sustainability, the fabrication of effective and eco-friendly agents for rubber industry has attracted extensive attention. In this study, a novel and nontoxic titanium dioxide-based vulcanization accelerator (xanthate-modified nanotitanium dioxide (TDSX)) with excellent antibacterial performance, for the first time, was synthesized under the catalyst of ceric ammonium nitrate. Notably, the thermal stability of xanthate was greatly enhanced after being grafted on titanium dioxide (TiO2) nanoparticles, in which the activation energy was increased from 6.4 to 92.5 kJ/mol, enabling the obtained TDSX with multiple functions, mainly consisting of fabulous vulcanization-promoting effects, reinforcing effects, antibacterial properties, and anti-ultraviolet aging effects for natural rubber (NR). Simultaneously, the TDSX can be effectively and uniformly dispersed in the rubber matrix along with the developed interface interaction between TDSX particles and rubber matrix. Compared to the traditional accelerators 2-mercaptobenzothiazole (M) system, the tensile strength and the tearing strength of NR/TDSX was improved by 26.3 and 40.4%, respectively. Potentially, our work for preparing green vulcanization accelerator can provide a new design strategy for multifunctional high performance elastomer materials.

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