Microcrystal exfoliation by UV light irradiation
AssigneesNational Guard Health Affairs, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center
InventorRabih O. Al-Kaysi
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Abstract
A method is described for exfoliating a microcrystal of an anthracene derivative by irradiation with short pulses of light having a wavelength of 220-420 nm. The irradiation induces a cis-trans isomerization of the anthracene derivative in a part of the microcrystal, which leads to the separation of an outer layer having a thickness of 200-600 nm. The exfoliated microcrystal may be irradiated again with pulses of light of a same or different wavelength.
Claims18
A method of exfoliating a microcrystal of cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate, the method comprising:
- irradiating a microcrystal of cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate with light having a wavelength of 250-410 nm,
- wherein the irritating induces in a portion of the microcrystal a cis-trans isomerization of cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate to trans-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate,
- wherein the irradiating separates an outer layer from the microcrystal to produce an exfoliated microcrystal, the outer layer having a thickness of 200-600 nm, and
- irradiating the exfoliated microcrystal with light having a wavelength of 250-410 nm to produce a second exfoliated microcrystal and a second layer having a thickness of 200-600 nm.
A method of exfoliating a microcrystal, the method comprising:
- irradiating a microcrystal of cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate with light having a wavelength of 220-420 nm,
- wherein the microcrystal is in the form of a rectangular block having a longest linear dimension of 5-100 μm and an aspect ratio of 1:1-10:1,
- wherein the microcrystal is formed by seeding a solution of dissolved cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate with a crystal of cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate, wherein the crystal has an octahedral form,
- wherein the irradiating induces in a portion of the microcrystal a cis-trans isomerization of cis-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate to trans-dimethyl-2(3-(anthracen-9-yl)allylidene)malonate, and
- wherein the irradiating separates an outer layer from the microcrystal to produce an exfoliated microcrystal, the outer layer having a thickness of 350-450 nm.
Dependencies are inferred from the claim text.