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Colloids Surf B Biointerfaces ; 126: 162-8, 2015 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-25561415


Stainless steel (SS) is favored for many uses due to its excellent chemical resistance, thermal stability and mechanical properties. Biofilms can be formed on stainless steel and may lead to serious hygiene problems and economic losses in many areas, e.g. food processing, public infrastructure and healthcare. For the first time, our work endeavored to make SS having antibacterial properties, ionic liquids (ILs) were grafted on SS surface via silane treatment followed by thiol-ene click reaction. The chemical structure and composition of the ILs grafted stainless-steel coupon surfaces were characterized by X-ray photoelectron spectroscopy (XPS) and attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. The antibacterial activity has been investigated, and the results showed that the ILs grafted SS surface exhibited significant antibacterial effects against Gram-negative Escherichia coli. Additionally, the results obtained here indicated that the ILs used here having bromide anion showed much better antibacterial activity against E. coli than the corresponding ILs with tetrafluoroborate and hexafluorophosphate as anions. These results obtained here can help to design novel and more efficient stainless steel having antibacterial surface.

Antibacterianos/farmacologia , Escherichia coli/efeitos dos fármacos , Líquidos Iônicos/farmacologia , Aço Inoxidável/farmacologia , Antibacterianos/química , Adesão Celular/efeitos dos fármacos , Relação Dose-Resposta a Droga , Escherichia coli/citologia , Líquidos Iônicos/química , Testes de Sensibilidade Microbiana , Estrutura Molecular , Aço Inoxidável/química , Relação Estrutura-Atividade , Propriedades de Superfície
Chem Commun (Camb) ; 51(4): 753-6, 2015 Jan 14.
Artigo em Inglês | MEDLINE | ID: mdl-25421529


A zinc borate Zn(1,3-DAP)[B4O7] (1) was prepared. 1 was revealed to be a rare chiral zeolitic framework based on a [B4O9] cluster. The combination of a [B4O9] cluster and Zn(1,3-DAP)O3 chain produced a helical ribbon motif and gave rise to a single-stranded helical channel.

Inorg Chem ; 54(2): 403-5, 2015 Jan 20.
Artigo em Inglês | MEDLINE | ID: mdl-25535768


Ni(en)3·Hen·[B9O13(OH)4]·H2O was prepared under the cotemplating effect of [Ni(en)3](2+) and Hen(+). It was the first example of a cotemplated borate with an unusual chiral polyanionic chain, which was constructed from [B5O8(OH)2] and [B4O7(OH)2] clusters.

Colloids Surf B Biointerfaces ; 111: 252-6, 2013 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-23831592


Biofilms can adhere to most surfaces and have caused a wide range of problems in various industrial processes as well as daily life activities. In this work, the anti-biofilm ability of Nafion-coated stainless steel surface was investigated and our results showed that stainless steel discs coated with 1% Nafion can significantly reduce E. coli adhesion. Nafion has a large amount of negatively charged sulphonate groups, and the findings of this study suggest that the negative surface charge can greatly reduce bacterial adhesion through increasing the electrostatic repulsion between negatively charged bacterial cells and Nafion coated stainless steel surface. The roughness of coated and uncoated stainless steel discs made no significant differences while the hydrophobic of the discs increased after coated with Nafion.

Biofilmes/efeitos dos fármacos , Materiais Revestidos Biocompatíveis/farmacologia , Escherichia coli/fisiologia , Polímeros de Fluorcarboneto/farmacologia , Aço Inoxidável/farmacologia , Aderência Bacteriana/efeitos dos fármacos , Contagem de Colônia Microbiana , Escherichia coli/efeitos dos fármacos , Escherichia coli/ultraestrutura , Soluções , Propriedades de Superfície , Água