Preparation and Optical Properties of Nano-Sized ZnO Colloidal Particles Using NH_3 Gas as Volatile Catalyst

スポンサーリンク

概要

• 論文の詳細を見る

• Nano-sized zinc oxide (ZnO) colloids were prepared by hydrolyzing zinc acetate solution with ammonia (NH3) gas as a volatile catalyst, instead of metal hydroxides such as NaOH and LiOH, which have been used previously. The procedure consists of two major steps: (1) preparing the precursor by reacting zinc acetate with ethanol, and (2) hydrolyzing the precursor to form the colloid. Hydrolysis was performed by bubbling the desired composition of NH3-N2 gas mixture into the precursor for the desired time in an ultrasonic bath. The hydrolysis conditions required for forming ZnO colloids such as the composition of the NH3-N2 gas mixture and bubbling times are examined. In addition, optical properties such as luminescence and absorption of these ZnO colloids produced via this basic hydrolysis procedure, and the effect of the residual NH3 in the suspension on colloidal stability are examined. It is found that a critical amount of dissolved NH3 to form nano-sized ZnO particles is existent, and that the luminescence intensity largely depends on the gas composition and the bubbling time. Residual NH3 remaining in the suspension greatly affects colloidal stability. But, it could be easily removed by evaporating ethanol of the solvent under reduced pressure. The resulting ZnO powder could be re-dispersed quickly and completely into ethanol. The luminescence and absorption properties of the re-dispersed colloidal suspension were almost the same as those of the original suspension. Moreover, the re-dispersed ZnO suspension was absolutely transparent for more than one month at room temperature. In other words, the colloidal stability is remarkably improved.

• 社団法人 化学工学会の論文

著者

• Sakohara Shuji

  Department Of Chemical Engineering Graduate School Of Engineering Hiroshima University

• HONDA Sanae

  Department of Chemical Engineering, Hiroshima University

• YANAI Yutaka

  Department of Chemical Engineering, Hiroshima University

• ANDERSON Marc

  Water Chemistry Program, University of Wisconsin-Madison

• Honda Sanae

  Department Of Chemical Engineering Hiroshima University

• Yanai Yutaka

  Department Of Chemical Engineering Hiroshima University

• Anderson Marc

  Water Chemistry Program University Of Wisconsin-madison

関連論文

• Preparation of Molecular Imprinted Thermosensitive Gel Adsorbents and Adsorption/Desorption Properties of Heavy Metal Ions by Temperature Swing
• Characterization and Swelling Behavior of Thermosensitive Porous Gel
• Measurements of Mechanical Properties on a Swollen Hydrogel by a Tension Test Method
• Synthesis of Nonporous Poly(N-alkylacrylamide) Gel Beads by Nonaqueous Sedimentation Polymerization
• Synthesis of Porous Poly(N-isopropylacrylamide) Gel Beads by Sedimentation Polymerization
• EFFECTS OF GEL COMPOSITION ON SEPARATION PROPERTIES OF ETHANOL/WATER MIXTURES BY ACRYLAMIDE GEL MEMBRANES
• Dewartering of Organic Slurry Using Thermosensitive Porous Gel
• Development and Performance of a Novel Molecular Imprinted Thermosensitive Gel with a Cross-linked Chelating Group for the Temperature Swing Adsorption of a Target Metal
• Preparation of Thermosensitive Microgel Adsorbent for Quick Adsorption of Heavy Metal Ions by a Temperature Change
• Preparation and Optical Properties of Nano-Sized ZnO Colloidal Particles Using NH_3 Gas as Volatile Catalyst
• The analysis of flow of rarefied gases through packed beds by monte carlo method.
• Swelling and shrinking processes of sodium polyacrylate-type super-absorbent gel in electrolyte solutions.
• Mechanism of polyacrylate gel shrinkage in an electric field.
• Turbidity removal from clay suspensions by use of organic polymeric flocculants.
• Separation of acetone/water mixture by thin acrylamide gel membrane prepared in pores of thin ceramic membrane.

もっと見る 閉じる

スポンサーリンク