“…This result shows that the porous materials with excellent activity of adsorption of ammonia can be prepared by boiling treatment for ≥12 h. Ammonia gas with concentration of ≈200 ppm can be adsorbed using 5 mg of the materials within 5 min. The activity is based on formation of POH 4 N by reaction between NH 3 and the POH group located at the interlayers , in the THP phase. 6 Ammonia adsorption of (a) charcoal-activated, (b) porous glass ceramic A-LTP, and (c−e) porous materials obtained by boiling treatment for various times.…”
AgTi 2 (PO 4 ) 3 with a three-dimensional network structure and Ti(HPO 4 ) 2 ‚2H 2 O with a twodimensional layered structure are phosphate crystals with different properties: the former shows excellent bacteriostatic activity and the latter is possible to be modified chemically by intercalation. A new type of microporous material with an integrated skeleton of AgTi 2 -(PO 4 ) 3 and Ti(HPO 4 ) 2 ‚2H 2 O crystals has been fabricated by acid treatment of the porous glass ceramic with the surface consisting predominantly of AgTi 2 (PO 4 ) 3 crystals and the interior phase of LiTi 2 (PO 4 ) 3 crystals prepared by exchange of Ag + ions for Li + ones. This processing is based on a phenomenon that LiTi 2 (PO 4 ) 3 is converted into Ti(HPO 4 ) 2 ‚2H 2 O in acid solutions at temperatures >50 °C. Bulk materials with continuous pores of various diameter sizes ranging from 10 nm to 1 µm with two main peaks located at ≈40 and ≈200 nm in the distribution can be obtained without serious cracking or deformation after acid treatment at ≈100 °C for 12 h. The specific surface area is ≈30 m 2 /g. The porous materials have various functions such as bacteriostatic activity, adsorption of ammonia gas, and intercalation of polar molecules which induces water-repellent properties. As the amount of Ag + ions released from the material into phosphate buffer solution was determined to be very small (<10 µequiv/g), the porous glass ceramics are expected to be novel bacteriostatic materials with multifunctionality and are medically safe.
“…This result shows that the porous materials with excellent activity of adsorption of ammonia can be prepared by boiling treatment for ≥12 h. Ammonia gas with concentration of ≈200 ppm can be adsorbed using 5 mg of the materials within 5 min. The activity is based on formation of POH 4 N by reaction between NH 3 and the POH group located at the interlayers , in the THP phase. 6 Ammonia adsorption of (a) charcoal-activated, (b) porous glass ceramic A-LTP, and (c−e) porous materials obtained by boiling treatment for various times.…”
AgTi 2 (PO 4 ) 3 with a three-dimensional network structure and Ti(HPO 4 ) 2 ‚2H 2 O with a twodimensional layered structure are phosphate crystals with different properties: the former shows excellent bacteriostatic activity and the latter is possible to be modified chemically by intercalation. A new type of microporous material with an integrated skeleton of AgTi 2 -(PO 4 ) 3 and Ti(HPO 4 ) 2 ‚2H 2 O crystals has been fabricated by acid treatment of the porous glass ceramic with the surface consisting predominantly of AgTi 2 (PO 4 ) 3 crystals and the interior phase of LiTi 2 (PO 4 ) 3 crystals prepared by exchange of Ag + ions for Li + ones. This processing is based on a phenomenon that LiTi 2 (PO 4 ) 3 is converted into Ti(HPO 4 ) 2 ‚2H 2 O in acid solutions at temperatures >50 °C. Bulk materials with continuous pores of various diameter sizes ranging from 10 nm to 1 µm with two main peaks located at ≈40 and ≈200 nm in the distribution can be obtained without serious cracking or deformation after acid treatment at ≈100 °C for 12 h. The specific surface area is ≈30 m 2 /g. The porous materials have various functions such as bacteriostatic activity, adsorption of ammonia gas, and intercalation of polar molecules which induces water-repellent properties. As the amount of Ag + ions released from the material into phosphate buffer solution was determined to be very small (<10 µequiv/g), the porous glass ceramics are expected to be novel bacteriostatic materials with multifunctionality and are medically safe.
A potassium titanium phosphate, KTi 2 (PO 4 ) 3 , and two types of hydrated titanium phosphates, α-Ti(HPO 4 ) 2 •H 2 O and γ-Ti(PO 4 )(H 2 PO 4 )•2H 2 O, were prepared by hydrothermal reaction using a layered lepidocrocite-type titanate as a starting compound. When layered lepidocrocitetype K 0.7 (Li,Ti) 2 O 4 (Lss; Ohtsuka Chemical Co., Ltd.) was used at a reaction temperature of 180°C, KTi 2 (PO 4 ) 3 was obtained. The crystal structure of KTi 2 (PO 4 ) 3 was a NASICON-like rhombohedral one with a low thermal expansion coefficient. The thermal expansion coefficient of KTi 2 (PO 4 ) 3 was determined using synchrotron X-ray powder diffraction data (SRXD), and the thermal expansion coefficients for the a-axis, c-axis and unit cell volume were −2.82 x 10 −6 , 7.16 × 10 −6 and 1.49 × 10 −6 K −1 , respectively. Two types of layered titanium phosphates, α-Ti(HPO 4 ) 2 •H 2 O and γ-Ti(PO 4 )(H 2 PO 4 )•2H 2 O, were prepared by hydrothermal reaction using protonated titanate (Lss-H) derived from lepidocrocite-type potassium titanate (Lss) by the ion-exchange reaction.
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