Fabrication Of Organic Compound Membrane On Titanium And Research On Antifouling Properties

Titanium with its high specific strength, high corrosion resistance, high heat resistance andexcellent biocompatibility are widely used in shipbuilding, marine engineering and biomedicine,including oil and gas platforms, desalination systems, heat exchange equipment, medicalequipment and surgical orthopedic materials. Experiments show that during some commonly usedmaterials, titanium antifouling performance is poor, such as sea bio-fouling on the surface ofmaterials, bacterial adhesion contamination on orthopedic material surface, etc., these willseriously affect its normal use performance, so we need to take effective measures to preventbiological fouling of titanium surface. Because titanium’s application environment is complex,involving many types of fouling organisms, such as marine diatoms, bacteria. How to achieve abroad-spectrum anti-fouling is a difficulty of the research of titanium surface antifouling.Fouling organisms’s adhesion started when protein adsorbed on the surface, and the adhesiveis cured by chemical bonding, electrostatic interactions, etc., forming attachment offset. Therefore,the development of anti-protein-adsorbing material will help to solve the fouling problem.Through the activation of the metal surface of titanium by plasma treatment and amino treatment,and an intermediate adhesive layer of polydopamine, by atom transfer radical polymerization(ATRP) methacryloyloxy ethyl-N, N-methyl-propanesulfonamide salt (SBMA) was grafted ontothe surface. Then a good resistance to protein adsorption, anti-diatom and antibacterial titaniummaterial was prepared. Also explore its anti-fouling mechanism by means of thermodynamics.First, study three activative ways’s impact of titanium surface, including phosphoric acidtreatment, plasma treatment, as well as the of dopamine, using confocal microscopy, contact anglemeasuring instrument and infrared spectroscopy to analysis and characterize. Experimental resultsshowed that using the latter two methods made the surdface flat, smooth, and molecular activationlayer and the metal surface was combined firmly.In the above two activated titanium surface, prepare SBMA titanium surface material (TADBS) by atom transfer radical polymerization ATRP, using field emission electronmicroscopy, infrared spectroscopy and spectroscopy to characterize, using cattle serum albumin,diatoms to study its antifouling properties, by electrochemical methods to investigate the effects ofSBMA grafted titanium’s corrosion resistance. The results showed that the intermediate activativeproduct TA and the final processed product TADBS were able to improve theanti-protein-adsorption, adhesion of Navicula pinna inhibition rate was92.7%and98.7%,respectively. It has excellent antifouling properties, further analysis showed that γ-may be a keyfactor of diatom’s attachment. Electrochemical test results showed grafting SBMA does not affecttitanium’s corrosion resistance, and improved the corrosion resistance because of the isolationaction of organic layer.To take full advantage of TA and TADBS which had amino groups and catechol group,through its complexation to Ag, Ag ions was introduced into the titanium surface. TADBS-Ag andTA-Ag was prepared. E.coli and Vibrio azureus experiments showed that TA and TA-Agperformed poor inhibiting bacterial adhesion, TADBS had better ability to inhibit bacterialadhesion; the introduction of Ag could further enhance its antibacterial properties.Modification titanium by sulfobetaine could prevent protein adsorption, inhibit bacterialadhesion and diatoms, although it exhibited excellent antifouling performance, but it needs furtherresearch and improvement if it is put into the application of the implant body and marine.