Corrosion prevention of iron with novel organic inhibitor of hydroxamic acid and UV irradiation

Deng, Huihua; Nanjo, Hiroshi; Qian, Pu; Xia, Zhengbin; Ishikawa, Ikuo; Suzuki, Toshishige M.

doi:10.1016/j.electacta.2007.11.008

Cited by 18 publications

(9 citation statements)

References 26 publications

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“…The offset error might be caused by inaccuracies associated with estimating the macroscale work of adhesion. For example, the contact angles measured on lawns of bacterial cells are affected by the structure 75 , thickness 76 and moist content 66 of bacterial lawn and the presence of macroscopic gas pockets 77 . Such heterogeneities in the various parameters associated with bacterial lawns will affect the contact angles measured and thus the surface tensions estimated from equation 5 and needed to calculate the work of adhesion in equation 6.…”

Section: Resultsmentioning

confidence: 99%

The role of the pH conditions of growth on the bioadhesion of individual and lawns of pathogenic Listeria monocytogenes cells

Park

Abu-Lail

2011

Journal of Colloid and Interface Science

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The work of adhesion that governs the interactions between pathogenic Listeria monocytogenes and silicon nitride in water was probed for individual cells using atomic force microscopy and for lawns of cells using contact angle measurements combined with a thermodynamic-based harmonic mean model. The work of adhesion was probed for cells cultured under variable pH conditions of growth that ranged from pH 5 to pH 9. Our results indicated that L. monocytogenes cells survived and adapted well to the chemical stresses applied. For all pH conditions investigated, a transition was observed in the generation time, physiochemical properties, biopolymer grafting density and bioadhesion for cells cultured in media adjusted to pH 7 of growth. In media with pH 7, the generation time for the bacterial cells was lowest, the specific growth rate constant was highest, the cells were the most polar, cells displayed the highest grafting density of surface biopolymers and the highest bioadhesion to silicon nitride in water represented in terms of the work of adhesion. When compared, the work of adhesion values quantified between silicon nitride and lawns of L. monocytogenes cells were linearly correlated with the work of adhesion values quantified between silicon nitride and individual L. monocytogenes cells.

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Section: Resultsmentioning

confidence: 99%

The role of the pH conditions of growth on the bioadhesion of individual and lawns of pathogenic Listeria monocytogenes cells

Park

Abu-Lail

2011

Journal of Colloid and Interface Science

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“…Since then, many different substances on different metals and alloys have been proven to be effective against corrosion. The list includes thiols [6][7][8][9][10][11][12][13][14][15][16][17][18][19], amines [12], phosphates [20], sulfates [21], thiosulfates [22], carboxylic acids [23][24][25][26][27][28][29], hydroxamic acids [29][30][31], amino acids [32][33][34], phosphonic acids [29,35], sulfonic acids [29], silane derivatives [36], as well as heterocyclic and other compounds [16,[37][38][39][40][41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Polystyrene films as barrier layers for corrosion protection of copper and copper alloys

Románszki

Datsenko

May

et al. 2014

Bioelectrochemistry

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Dip-coated polystyrene layers of sub-micrometre thickness (85-500 nm) have been applied on copper and copper alloys (aluminium brass, copper-nickel 70/30), as well as on stainless steel 304, and produced an effective barrier against corrosion and adhesion of corrosion-relevant microorganisms. According to the dynamic wettability measurements, the coatings exhibited high advancing (103°), receding (79°) and equilibrium (87°) contact angles, low contact angle hysteresis (6°) and surface free energy (31 mJ/m 2 ). The corrosion rate of copper-nickel 70/30 alloy samples in 3.5% NaCl was as low as 3.2 µm/a (44% of that of the uncoated samples), and in artificial seawater was only 0.9 µm/a (29% of that of the uncoated samples). Cell adhesion was studied by fluorescence microscopy, using monoculture of Desulfovibrio alaskensis. The coatings not only decreased the corrosion rate but markedly reduced the number of bacterial cells adhered to the coated surfaces. The PS-coating on copper gave the best result, 2×10 3 cells/cm 2 (1% of that of the uncoated control).

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“…Asam-asam hidroksamik, hydroxamic acids, merupakan agen pengkelat (chelating agent) turunan hidroksilamina dan asam karboksilat, oleh karena itu asam hidroksamik juga disebut N-hidroksi amida karboksilat dengan rumus umum R-CO-NHOH. Akhir-akhir ini, asam hidroksamik dan turunannya mendapat perhatian serius dari banyak peneliti yang disebabkan oleh aktivitas biologinya, seperti pemacu pertumbuhan, antibiotik, antifungi (Kurzak et al 1992), inhibitor enzim (Anandan et al 2007), anti tumor (Holmes et al 2001), pencegah korosi besi (Deng et al 2008) dan anti oksidan (Liu et al 2008). Kompleks antara asam hidroksamik dengan berbagai ion logam banyak digunakan untuk keperluan kimia analitik, yaitu sebagai reagen pada penentuan logam secara gravimetri dan spektrometri (Pacco 2008), sebagai sensor kimia dalam penentuan logam-logam renik (Isha et al 2007), sebagai kolektor untuk unsur-unsur tanah jarang (Agrawal & Kaur 1999), dan untuk mengekstrak ion-ion logam dari larutan (Suhendra et al 2005a(Suhendra et al & 2005b (Meyer 1994).…”

Section: Pendahuluanunclassified

Sintesis Asam-Asam Lemak Hidroksamik dari Minyak Kelapa Menggunakan Lipase sebagai Katalis

Suhendra

Gunawan

2012

J.Nat.Indones

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Fatty hydroxamic acids (FHAs) have been successfully synthesized from coconut oil by a one-step lipase catalyzed reaction. FHAs are the acids that are based on fatty acids. Their hydrophobicity can be use for some applications such as surfactant and metal ions extraction from aqueous media. This paper describes enzymatic synthesis of FHAs from coconut oil by reacting hydroxylamine with the substrate catalyzed by a lipase. The lipase used was Lipozyme, a commercially lipase of Mucor meihe fixed on a polymer anion exchange resin. The use of immobilized lipase as the catalyst for the preparation reaction provides an easy isolation of the enzyme from the products and other components in the reaction mixture. In addition, it also allows the reaction to be carried out under mild conditions, which reduces the reaction's side products. The optimum preparation conditions obtained were as follows; the reaction temperature was 30 o C, the reaction time was 30 h, the ratio of coconut oil : lipozyme (g : g) was 29.5, and the ratio of hydroxylamine : coconut oil (mmol : mmol) was 6. The solvent used was hexane. The purified products were characterized by qualitative test, such as FTIR spectroscopy and HPLC. ABSTRAK BERBAHASA INDONESIAAsam-asam lemak hidroksamik (ALH) telah berhasil disintesis dari minyak kelapa menggunakan lipase sebagai katalis. ALH adalah asamasam turunan asam lemak, oleh karena itu sifat hidrofobisitasnya dapat digunakan untuk beberapa aplikasi seperti surfaktan dan ekstraksi ion-ion logam dari media larutan air. Tulisan ini menggambarkan sintesis ALH dari minyak kelapa secara enzimatis dengan mereaksikan hidroksilamina dengan substrat menggunakan katalis lipase. Lipase yang digunakan adalah lypozyme, yaitu suatu lipase komersial dari Rhizomucor miehei yang diimmobilisasi ke dalam resin penukar anion. Penggunaan lipase yang diimobilisasi sebagai katalis disebabkan kemudahan isolasi produk dari komponen-komponen lain dalam campuran reaksi. Lypozyme juga memungkinkan reaksi berlangsung pada suhu rendah yang tentunya mengurangi resiko terbentuknya produk samping. Kondisi-kondisi optimum yang diperoleh adalah suhu reaksi 30 o C, waktu reaksi 30 jam, rasio minyak kelapa : lypozyme (g : g) adalah 40 : 1 dan rasio hidroksilamina : minyak kelapa (mmol : mmol) adalah 2,21 : 1. Pelarut yang digunakan adalah heksana. Produk yang telah dimurnikan telah karakterisasi menggunakan tes kualitatif, spektroskopi infra merah dan CHN elemental analysis.

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Corrosion prevention of iron with novel organic inhibitor of hydroxamic acid and UV irradiation

Cited by 18 publications

References 26 publications

The role of the pH conditions of growth on the bioadhesion of individual and lawns of pathogenic Listeria monocytogenes cells

The role of the pH conditions of growth on the bioadhesion of individual and lawns of pathogenic Listeria monocytogenes cells

Polystyrene films as barrier layers for corrosion protection of copper and copper alloys

Sintesis Asam-Asam Lemak Hidroksamik dari Minyak Kelapa Menggunakan Lipase sebagai Katalis

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