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    • 8. 发明申请
    • METHOD FOR USING A STATIC ELECTRIC FIELD TO INDUCE CRYSTALLIZATION AND TO CONTROL CRYSTAL FORM
    • 使用静电场诱导结晶和控制晶体形式的方法
    • WO2006124152A2
    • 2006-11-23
    • PCT/US2006/013324
    • 2006-04-11
    • POLYTECHNIC UNIVERSITYGARETZ, Bruce, A.MYERSON, Allan, S.ARNOLD, StephenABER, Janice, E.
    • GARETZ, Bruce, A.MYERSON, Allan, S.ARNOLD, StephenABER, Janice, E.
    • C07K14/47
    • C30B29/58B01D9/005C07K1/306C12N13/00C30B7/00C30B29/54C30B30/02
    • Applying a strong static DC electric field to supersaturated aqueous glycine solutions resulted in the nucleation of the Y polymorph attributed to the electric-field induced orientation of the highly polar glycine molecules in large preexisting solute clusters, helping them organize into a crystalline structure. A method to induce crystallization and to prepare polymorphs and/or morphologies of materials by using a static electric field to cause nucleation and crystal growth to occur in a supersaturated solution in such a way as to obtain a crystal structure that would not normally appear without the use of the static electric field. Aqueous glycine solutions were prepared by combining solid glycine and water. Supersaturated solutions were generated by heating the tubes to 62- 640C and holding them at that temperature in an ultrasonicator overnight. Once the glycine was completely dissolved, the solutions were slowly cooled to room temperature. A chamber was constructed consisting of two brass electrodes separated by a 5 mm insulating gap, with a hole drilled down through the center, parallel to the gap-electrode interface, with a diameter large enough to accommodate the test tube. A DC voltage was applied across the electrodes; large enough to produce electric fields in the range of 400,000 to 800,000 V/m. Tests tubes containing the aged solutions were placed in the high-voltage chamber. Exposure of the aged solutions to fields of 600,000 V/m resulted in crystallization typically within 30-90 min. The onset of nucleation was observed visually by the formation of a needle-shaped crystallite.
    • 将强静态DC电场应用于过饱和甘氨酸水溶液导致Y型多晶型物的成核归因于大型预先存在的溶质簇中高极性甘氨酸分子的电场诱导取向,有助于它们组织成晶体结构。 通过使用静电场引起结晶并制备材料的多晶型物和/或形态的方法,以使得在过饱和溶液中发生成核和晶体生长,以获得通常不会出现的晶体结构 使用静电场。 通过结合固体甘氨酸和水制备甘氨酸水溶液。 通过将管加热至62-64℃并将其在超声波隔离器中保持在该温度下而产生过饱和溶液。 一旦甘氨酸完全溶解,将溶液缓慢冷却至室温。 由两个黄铜电极构成的腔体由两个黄铜电极隔开,绝缘间隔为5mm,孔穿过中心平行于间隙 - 电极界面钻出,直径足够大以容纳试管。 跨电极施加直流电压; 足够大以产生在400,000至800,000V / m范围内的电场。 将含有老化溶液的试管置于高压室中。 将老化溶液暴露于600,000V / m的场中,结晶通常在30-90分钟内。 通过形成针状微晶目测观察成核的开始。