Micropore Formation by Acid Treatment of Antigorite

Kosuge, Katsunori; Shimada, Kazuaki; Tsunashima, Atsumu

doi:10.1021/cm00060a009

Cited by 58 publications

(37 citation statements)

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“…Under acidic conditions, brucite layers of Mg(OH 2 ) dissolves from serpentine, leaving the silica as a product layer. 8,19) The dissolution reaction of Mg from serpentine in H 2 SO 4 solution can be expressed as follows:…”

Section: Resultsmentioning

confidence: 99%

“…7. 8) In the H 2 SO 4 dissolution of serpentine ore, Mg in the brucite layer between the silica layers dissolves in the acid solution, while the silica which has not dissolved in the acid solution forms thin channels by maintaining its own morphology. Thus, it was assumed that the dissolution of Mg from serpentine ore in the acid solution proceeds by the diffusion of the acid solution throughout the thin channels formed between the silica layers which may act as a diffusion barrier of H 3 O þ ions.…”

Section: Kinetic Analysismentioning

confidence: 99%

“…Kosuge et al have extensively studied the preparation of magnesium sulfate, amorphous silica and siliceous porous materials by acid treatment of the serpentine mineral. 8) Kim et al have conducted research on the synthesis of zeolite using highly porous amorphous silica obtained from serpentine by hydrochloric acid treatment. 9) As interest increases in the capture and storage of CO 2 , one of greenhouse gases linked to global warming, the availability of serpentine mineral for sequestering CO 2 emissions generated from fossil fuel combustion has been investigated.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution of Magnesium from Serpentine Mineral in Sulfuric Acid Solution

Yoo

Kim

et al. 2009

Mater. Trans.

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As the volume of CO 2 , one of greenhouse gases linked to global warming, in the atmosphere increases, there has been an increasing interest in CO 2 sequestration. Aqueous carbonation, which involves the extraction of Mg from serpentine minerals and the subsequent carbonation reaction with CO 2 to form the geologically stable mineral MgCO 3 , has been proposed as a promising CO 2 sequestration technology. This study investigates the dissolution of Mg from serpentine mineral in H 2 SO 4 solution. The study is part of a major research project aimed at developing an effective CO 2 sequestration technology using the serpentine mineral which is readily available in Korea. Complete dissolution of Mg from natural serpentine was achieved in 30 min at a temperature of 90 C under 0.5 M H 2 SO 4 . The rate of dissolution of Mg was independent of the agitation speed at speeds above 300 rpm. The fraction of Mg dissolved from milled serpentine was found to be a little higher than that from natural serpentine up to 70 C in 0.5 M H 2 SO 4 . The Jander equation was used to explain the dissolution rate data. The rate of Mg dissolution seemed to be limited by diffusion through the thin channels formed between the silica layers in the serpentine particles.

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Section: Resultsmentioning

confidence: 99%

Section: Kinetic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dissolution of Magnesium from Serpentine Mineral in Sulfuric Acid Solution

Yoo

Kim

et al. 2009

Mater. Trans.

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“…It is well-known that the components of the clay minerals except SiO2 can be leached out by acid solution to yield porous SiO2. A variety of clay minerals such as metakaolinite, 7) antigorite, 8) chrysotile 9) -11) montmorillonite, 12),13) chlorite, 14) phlogopite, 15) vermiculite, 16) talc 17) and sepiolite 18) have been attempted to make porous silica by selective acid leaching. Souquet reported that complete leaching of chrysotile was accomplished by treating it for 2 h. at 90°C with 6 M HCl and the product was non-crystalline porous fibers.…”

Section: Jcs-japanmentioning

confidence: 99%

Hydrothermal conversion of chrysotile to amorphous silica or brucite

Kumada

Yonesaki

Takei

et al. 2009

J. Ceram. Soc. Japan

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“…Such ACV containing corneal substitutes will be suitable for high risk transplant patients with latent HSV, aiding in the prevention of HSVreactivation triggered by the surgery. Silica (SiO 2 ) nanoparticles (NP) (diameter < 100 nm) were selected as a prototype delivery vehicle, as they are simple to prepare and a range of methods for preparing porous SiO 2 NP are available [14,[22][23][24][25][26][27][28]. The microemulsion and reversed micelle (with HCl) method [29][30][31] was selected, as the water-oil microemulsion effectively encapsulates hydrophobic drugs (such as ACV), by dissolving the drug in the oil phase [17].…”

Section: Introductionmentioning

confidence: 99%

Controlled Release of Acyclovir Through Bioengineered Corneal Implants with Silica Nanoparticle Carriers~!2009-08-29~!2010-01-05~!2010-03-18~!

Bareiss¹,

Ghorbani²,

Li³

et al. 2010

TOTERMJ

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Abstract:Herpes simplex virus (HSV) infection is the most common cause of corneal blindness in the Western world. Despite effective anti-viral drugs such as acyclovir (ACV), disease recurrence due to the virus establishing latency within the corneal nerves and possibly cells makes treatment very challenging. Furthermore, although effective, current systemic and topical preparations of anti-viral drugs do not appear to deliver sufficient quantities to the cornea to prevent reactivation. Current treatment for HSV vision loss is transplantation with donor corneas, but the surgery itself can reactivate viruses. We examined the feasibility of preventing viral reactivation during surgery, by sustained delivery of ACV introduced during corneal transplantation surgery, through encapsulation of the drug within silica (SiO 2 ) nanoparticles (NP) incorporated into biosynthetic alternatives to donor corneas. We show that incorporation of NPs did not affect optical clarity of the collagen-based corneal substitutes nor their biocompatibility. NP-encapsulation effectively sustained ACV release from the biosynthetic implants over 10 days, compared to free ACV incorporated directly into the hydrogel constructs. The NP-enabled sustained release resulted in effective prevention of virally-induced cell death, not observed with the free drug. This early model demonstrates the feasibility of using biomimetic corneal substitutes that incorporate a drug release system (e.g. silica nanoparticles encapsulating ACV) as future alternatives to human donor tissue grafts, for transplantation of HSV-infected corneas.

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Micropore Formation by Acid Treatment of Antigorite

Cited by 58 publications

References 0 publications

Dissolution of Magnesium from Serpentine Mineral in Sulfuric Acid Solution

Dissolution of Magnesium from Serpentine Mineral in Sulfuric Acid Solution

Hydrothermal conversion of chrysotile to amorphous silica or brucite

Controlled Release of Acyclovir Through Bioengineered Corneal Implants with Silica Nanoparticle Carriers~!2009-08-29~!2010-01-05~!2010-03-18~!

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