Submicron rectangular hollow tube crystals of rutile-type GeO2

Single Crystal Synthesis Methods Dedicated to Structural Investigations of Very Low Solubility Mixed-Actinide Oxalate Coordination Polymers

“…The tubular morphology of the hexagonal crystals, with sharp edges, is quite unexpected, although hollow crystals have already been described in the literature for inorganic crystals such as Se and Te, ZnSe and ZnS, ZnO, or rutile-type GeO 2 , metal organic framework crystals, and organic crystals such as pharmaceutical compounds. , Secondary electron images of U(IV)-oxalate crystals (Figure ) indicate that the hole appears all along the needles. The morphology is reproducible even though the diameter of the holes is different according to the synthesis method and the studied system.…”

Formation of Crystalline Hollow Whiskers as Relics of Organic Dissipative Structures

“…Hollow crystals, also called hollow needles, hollow whiskers, tubular crystals, etc., result from a particular crystal growth. Numerous examples are reported in the literature, most of them related to inorganic materials, such as ZnO, 1 GeO 2 , 2 CdSe, or CdS. 3 Rare cases concern organic material.…”

Growth and Optical Properties of Rectangular Hollow Tube TiO2 Crystals with Rutile-Type Structure

“…Materials with tubular structure are very attractive in terms of their novel physical and chemical properties owing to the unique morphology. Therefore, many studies have been carried out for various classes of chemicals, − such as carbon, BN, , and Al 2 O 3 , etc., in order to fabricate tubular materials.…”

“…Although many tubular materials have been reported so far, tubular single crystals with a rectangular hollow-shaped cross section have been limited. − ,, Rectangular hollow tube crystals for various other component materials are interesting and important issues not only for fundamental understanding of the crystal growth mechanism but also in view of novel functional materials. Liu et al succeeded to grow the square-shaped SnO 2 tube arrays on the quartz substrates using a combustion chemical vapor deposition (CVD) method. , They concluded that the direct vapor–solid (VS) process was a dominant mechanism for growth of the square-shaped SnO 2 tube arrays.…”