Synthesis of Microtubes with a Surface of “House of Cards” Structure via Needlelike Particles and Control of Their Pore Size

Mitsuhashi, Kohei; Tagami, Naoki; Tanabe, Katsuyuki; Ohkubo, Takahiro; Sakai, Hideki; Koishi, Masumi; Abe, Masahiko

doi:10.1021/la047580o

Cited by 79 publications

(72 citation statements)

References 14 publications

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“…XRD and FTIR data also validated the formation of magnesium hydroxide on Mg-rich primers in the salt-spray chamber. On the other hand, SEM micrographs of free primer films exposed to natural weathering showed the presence of needle-like crystals reported for magnesium carbonate by several authors [22,68,69]. …”

Section: Unnoticed Factors That Influence the Behavior Of Mg-rich Primentioning

confidence: 60%

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Pathak

Mendon

Blanton

et al. 2012

Metals

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Abstract:Magnesium is electrochemically the most active metal employed in common structural alloys of iron and aluminum. Mg is widely used as a sacrificial anode to provide cathodic protection of underground and undersea metallic structures, ships, submarines, bridges, decks, aircraft and ground transportation systems. Following the same principle of utilizing Mg characteristics in engineering advantages in a decade-long successful R&D effort, Mg powder is now employed in organic coatings (termed as Mg-rich primers) as a sacrificial anode pigment to protect aerospace grade aluminum alloys against corrosion. Mg-rich primers have performed very well on aluminum alloys when compared against the current chromate standard, but the carcinogenic chromate-based coatings/pretreatments are being widely used by the Department of Defense (DoD) to protect its infrastructure and fleets against corrosion damage. Factors such as reactivity of Mg particles in the coating matrix during exposure to aggressive corrosion environments, interaction of atmospheric gases with Mg particles and the impact of Mg dissolution, increases in pH and hydrogen gas liberation at coating-metal interface, and primer adhesion need to be considered for further development of Mg-rich primer technology.

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Section: Unnoticed Factors That Influence the Behavior Of Mg-rich Primentioning

confidence: 60%

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Pathak

Mendon

Blanton

et al. 2012

Metals

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“…Kloprogge et al [5] fabricated two different morphologies of MgCO 3 ·3H 2 O, a conglomerate consisted of very thin sheetlets and a well-formed needle at 25 °C. Mitsuhashi et al [6] developed a procedure to prepare needle-like MgCO 3 ·3H 2 O by the carbonation of an aqueous suspension of magnesium hydroxide with carbon dioxide over the temperature range of 35-70 °C. The influence of reaction temperature and various pH values on the morphology of MgCO 3 ·3H 2 O in the precipitation process by the reaction of Mg(NO 3 ) 2 with K 2 CO 3 were investigated [7].…”

Section: Introductionmentioning

confidence: 99%

Precipitation of nesquehonite from homogeneous supersaturated solutions

Cheng

2009

Cryst. Res. Technol.

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The homogeneous (unseeded) precipitation of nesquehonite (MgCO 3 ·3H 2 O) was studied over the temperature range of 10-40 °C. Precipitation was triggered by the supersaturation created by mixing MgCl 2 solution (0.5-1.5 M) with Na 2 CO 3 solution in the same concentration range. The Meissner's method was adopted in the calculation of supersaturations during the MgCl 2 -Na 2 CO 3 reaction to monitor the precipitation. Solids were identified using X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) images. In the temperature range of 10-40 °C, MgCO 3 ·3H 2 O with needle-like or gel-like morphology was precipitated. It was seen that the length, width and surface smoothness of the particles changed with reaction temperature and supersaturation. The supersaturation (S) was in the range of 1.09-58.68 during titration of Na 2 CO 3 solution. The dimension of the crystals increased with longer addition time (or lower initial concentration of reactant) at the same temperature. Slower addition via titration of 2 h followed by 2 h of equilibration at 40 °C proved successful in producing well developed needle-like MgCO 3 ·3H 2 O crystals of 30-50 µm long and 3-6 µm wide. MgCO 3 ·3H 2 O obtained were calcined to produce highly pure magnesium oxide (MgO) at 800 °C. The morphology of MgO was similar to that of their corresponding precursors.

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“…[2] The synthesis of tubular structures from materials such as silica, magnesium oxide, titanium dioxide, and zinc oxide has been reported. [11] Along with these techniques the fabrication of microwire arrays in situ using electrochemical [12][13][14] and electroless [15][16][17] deposition in a porous template has proven to be a superior option for preparing more complex, higher-aspect-ratio 3D microtube and microwire arrays. [18] The formation of luminescent structures by incorporating rare-earth ions into a porous matrix using various techniques like ion-implantation, [19] electrochemical migration, [20] or the spin-on technique [21] has been demonIn this paper a novel technique for the production of aluminosilicate microtubes, which are shown to act as optical cylindrical microresonators, is described.…”

Section: Introductionmentioning

confidence: 99%

The Fabrication, Fluorescence Dynamics, and Whispering Gallery Modes of Aluminosilicate Microtube Resonators

Rakovich

Balakrishnan

Donegan

et al. 2007

Adv Funct Materials

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In this paper a novel technique for the production of aluminosilicate microtubes, which are shown to act as optical cylindrical microresonators, is described. The free‐standing microtubes are fabricated by using vacuum‐assisted wetting and filtration of silica gel through a microchannel glass matrix. The microtubes are studied using scanning electron microscopy, micro‐photoluminescence spectroscopy, and fluorescence lifetime imaging confocal microscopy. In the emission spectra of the microresonators we find very narrow periodic peaks corresponding to the whispering gallery modes of two orthogonal polarizations with quality factors up to 3200. A strong enhancement in photoluminescence decay rates at high excitation power demonstrates the occurrence of amplified spontaneous emission from a single microtube. These microtubes show a large evanescent field extending many micrometers beyond the tube radius. Applications for these novel microresonators will be in the areas of microlasers and microsensors and quantum information processing.

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Synthesis of Microtubes with a Surface of “House of Cards” Structure via Needlelike Particles and Control of Their Pore Size

Cited by 79 publications

References 14 publications

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Magnesium-Based Sacrificial Anode Cathodic Protection Coatings (Mg-Rich Primers) for Aluminum Alloys

Precipitation of nesquehonite from homogeneous supersaturated solutions

The Fabrication, Fluorescence Dynamics, and Whispering Gallery Modes of Aluminosilicate Microtube Resonators

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