Particles
First Claim
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1. A method comprising:
- forming a liquid stream of a mixture comprising a polymer and a gelling precursor;
exposing the liquid stream to a vibration generated by a dual-channel frequency generator, the vibration having a waveform selected from the group consisting of triangular waveforms, and sawtooth waveforms to form a stream of non-spherical drops comprising the polymer and the gelling precursor;
observing the stream of drops at a frequency generated by the dual-channel frequency generator, the frequency of observing being different from a frequency of the vibration, the difference between the frequency of observing and the frequency of the vibration being at most about 10 Hertz;
contacting the stream of drops with a gelling agent to form first particles comprising a gel; and
removing the gel from the first particles to provide second particles having pores.
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Abstract
Particles and related methods are disclosed. In some embodiments, a method of making particles can include forming a stream of a mixture including first and second materials, exposing the stream to a vibration, and treating the stream to form particles. The vibration can have, for example, a sinusoidal, triangular, and/or sawtooth waveform.
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Citations
26 Claims
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1. A method comprising:
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forming a liquid stream of a mixture comprising a polymer and a gelling precursor; exposing the liquid stream to a vibration generated by a dual-channel frequency generator, the vibration having a waveform selected from the group consisting of triangular waveforms, and sawtooth waveforms to form a stream of non-spherical drops comprising the polymer and the gelling precursor; observing the stream of drops at a frequency generated by the dual-channel frequency generator, the frequency of observing being different from a frequency of the vibration, the difference between the frequency of observing and the frequency of the vibration being at most about 10 Hertz; contacting the stream of drops with a gelling agent to form first particles comprising a gel; and removing the gel from the first particles to provide second particles having pores. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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forming a stream of non-spherical drops at a first frequency using a dual-channel frequency generator, the stream of drops comprising a mixture of a polymer and a gelling precursor; observing the stream of drops at a second frequency generated by the dual-channel frequency generator; treating the stream of drops with a gelling agent to form first particles, wherein the first particles comprise a gel; and removing the gel from the first particles to provide second particles having pores. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification