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The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
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Interzeolite-type transformation between microporous titanosilicates.

Stanislav Ferdov1,2

  • 1Physics Centre of Minho and Porto Universities (CF-UM-UP), University of Minho, 4710-057 Braga, Portugal. sferdov@fisica.uminho.pt.

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This study shows microporous titanosilicate ETS-4 transforming into GTS-1 via a reversed crystallization pathway. This discovery advances synthesis methods and offers insights into templating crystal morphology through particle self-assembly.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Microporous heteropolyhedral silicates are crucial materials with diverse applications.
  • Understanding interzeolite transformations is key to developing novel synthetic strategies.
  • Titanosilicates, like ETS-4 and GTS-1, exhibit unique structural and catalytic properties.

Purpose of the Study:

  • To report the first interzeolite-type transformation between microporous heteropolyhedral silicates.
  • To elucidate the mechanism of transformation from ETS-4 to GTS-1.
  • To explore the potential for templating crystal morphology via particle self-assembly.

Main Methods:

  • Synthesis of preformed spherulitic particles of Engelhard Titanium Silicate-4 (ETS-4).
  • Treatment of ETS-4 particles in a KOH solution to induce transformation.
  • Characterization of the resulting crystalline phases using techniques like X-ray diffraction and electron microscopy.

Main Results:

  • Demonstrated the transformation of ETS-4 into Grace Titanium Silicate-1 (GTS-1) in KOH solution.
  • Identified a distinct reversed crystallization pathway initiated on the seed particle surface.
  • Observed the reconstructive self-assembly of multiple single crystals from initial particles.

Conclusions:

  • This work presents the first example of an interzeolite-type transformation between microporous heteropolyhedral silicates.
  • The findings provide mechanistic insights into a novel crystallization route.
  • This pathway allows for templating crystal morphology through particle self-assembly, advancing synthesis methodologies for microporous titanosilicates.