A Facile Method to Prepare a Hydrophilic/Hydrophobic Metal Surface by Peptide

A facile method to prepare a hydrophilic/hydrophobic metal surface by metal-binding peptide was proposed in this article. Metal-binding peptide sequenced NLNPNTASAMHV was taken as the target peptide to interact with stainless steel. The surface morphology, roughness and Fourier-Transform Infrared spectroscopy (FTIR) showed that some changes occurred on the modified stainless steel surface. Not only were the surfaces coarser but also some organic groups appeared on the modified sample surfaces. By comparing the CAs of all the samples, the most suitable concentration of peptide and treating time were determined. A new and facile way to endow some metals surfaces with hydrophobicity or hydrophilicity has been developed, which is useful especially for antibiofouling.

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Degree of Conversion of Three Light-Cured Orthodontic Adhesives

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.777.577 ◽

2018 ◽

Vol 777 ◽

pp. 577-581

Author(s):

Wassana Wichai ◽

Kanin Nimcharoensuk ◽

Niwat Anuwongnukroh ◽

Surachai Dechkunakorn ◽

Pitchaya Roongrujimek

Keyword(s):

Stainless Steel ◽

Fourier Transform ◽

Infrared Spectroscopy ◽

Fourier Transform Infrared Spectroscopy ◽

In Vitro Study ◽

Degree Of Conversion ◽

Friedman Test ◽

Orthodontic Adhesives ◽

Time Periods

Introduction: The aim of this in-vitro study was to analyze the polymerization ability of 3 light-cured orthodontic adhesives by determining the degree of conversion (DC). Materials and Methods: Fourier transform infrared spectroscopy (FTIR) was used to evaluate the DC after polymerization immediately, 1 day, 7 days, and 30 days. The adhesives investigated were Transbond XT (3M Unitek, USA), Grengloo (Ormco Corp., USA), and Green Glue (Hangzhou Biomaterials, China). Twelve stainless steel brackets (n=4) were used and the adhesives were cured with Bluephase G2 (Ivoclar Vivadent, Liechtenstein). The data were analyzed by Kruskal-Wallis test for comparing materials and Friedman test for comparing the time periods. Results: The DC values were significantly different among the materials and among the time periods. The highest DC in each period was obtained for Grengloo and the lowest DC was observed for Transbond XT. Thus, there were significant differences between the DC values of Grengloo and Transbond XT in each period. Among the time periods, DC% at T1 (Immediately) and T3 of the material were significantly different. The DC values of all adhesives increased extremely from immediately following curing to 1 day and then slightly increased from 1 day to 7 days. Conclusions: Grengloo showed the highest levels of DC at all tested periods. The percentage values of DC largely increased from immediately following curing to 1 day. This concluded that monomers in orthodontic adhesives kept converting even after completion of photoactivation.

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H2SO4 and Maleic Anhydride Electrochemistry Modifications on Carbon Fiber and Effects on Immobilization of Microorganism in Waste Water

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.209-211.2013 ◽

2012 ◽

Vol 209-211 ◽

pp. 2013-2017

Author(s):

Yan Ling Bao ◽

Guang Ze Dai ◽

Jing Jing Ling ◽

Qing Qing Ni

Keyword(s):

Waste Water ◽

Surface Roughness ◽

Fourier Transform ◽

Infrared Spectroscopy ◽

Carbon Fiber ◽

Maleic Anhydride ◽

Surface Morphology ◽

Fourier Transform Infrared Spectroscopy ◽

The Other ◽

Microorganism Immobilization

PAN-based carbon fiber (CF) was modified by electrochemistry using H2SO4 and maleic anhydride (MA) in current rearch. The CF surface morphology and natures were characterized by specific facilities, such as laser confocal microsopy (LCM), Fourier transform infrared spectroscopy (FTIR) and the degree of moisture. On the other hand, the biocompatibility nature was indicated by immobilization results of microorganisms on CF. The outcomes show that the surface hydrophilicity, oxygen-based function-groups and surface roughness of CF would contribute greatly to improve the immobilization ability of microorganisms on CF surface. And H2SO4 anodic oxidation on CF has more effect on microorganism immobilization than MA electropolymerization.

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Use of Total Organic Carbon Analysis and Fourier-Transform Infrared Spectroscopy to Determine Residues of Cleaning Agents on Surfaces

Journal of AOAC International ◽

10.1093/jaoac/80.5.1078 ◽

1997 ◽

Vol 80 (5) ◽

pp. 1078-1083 ◽

Cited By ~ 11

Author(s):

Christopher E Biwald ◽

Walter K Gavlick

Keyword(s):

Stainless Steel ◽

Fourier Transform ◽

Organic Carbon ◽

Total Organic Carbon ◽

Steel Surface ◽

Fourier Transform Infrared ◽

Stainless Steel Surface ◽

Organic Residue ◽

Cleaning Agent ◽

Cleaning Agents

Abstract Total organic carbon (TOC) analysis can be used in many cases as a nonspecific method of determining trace levels of organic residue on manufacturing equipment before and after cleaning. In this study, a swab sampling method followed by TOC analysis is used to determine organic residue levels associated with alkaline and acidic cleaning agents on a stainless steel surface. The alkaline cleaning agent was nonvolatile, resulting in favorable TOC analysis and validation. The acidic cleaning agent was very volatile, requiring more skilled sample handling and resulting in a more difficult validation. Fourier-transform infrared (FTIR) spectroscopy with a grazing-angle sample attachment can be used for direct surface measurements of cleaning-agent residues on a stainless steel surface. FTIR spectroscopic studies complement and support the TOC studies. One band chosen for each cleaning agent was monitored throughout the leaning process. cidic and alkaline

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