Langmuir-Blodgett coating process
AssigneeHoechst Celanese Corporation
InventorsGunilla E. Gillberg-LaForce, Anthony Artigliere, Jr.
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Abstract
In one embodiment this invention provides an improved Langmuir-Blodgett procedure for producing a nonlinear optical medium consisting of a transparent substrate coated with a continuous film of at least one monomolecular layer of uniaxially aligned surface active organic molecules which exhibit nonlinear optical susceptibility.
Claims38
A process for forming a continuous film on a solid substrate which comprises coating the substrate surface by Langmuir-Blodgett deposition technique with at least one monomolecular layer of uniaxially aligned surface active organic molecules, wherein the deposition technique comprises (1) compressing the monomolecular layer of surface active organic molecules spread on the water surface in a Langmuir-Blodgett trough until the area per extended organic chain of the uniaxially aligned molecule is less than about 30 .ANG..sup.2 /chain;
- (2) reducing the compression on the monomolecular layer by about 5-40 dynes per centimeter;
- and (3) dip-coating the substrate with the monomolecular layer while maintaining a constant compression on the area of uniaxially aligned molecules spread on the water surface.
A process for preparing a nonlinear optical medium which comprises coating a transparent solid substrate surface by Langmuir-Blodgett deposition technique with a continuous film of at least one monomolecular layer of uniaxially aligned quinodimethane molecules corresponding to the formula:
- ##STR5## where R is a substituent selected from aliphatic, alicyclic and aromatic groups containing between about 6-30 carbon atoms, and R.sup.1 is hydrogen or an R substituent;
- and n is an integer with a value of 0-3;
- wherein the deposition technique comprises (1) compressing the monomolecular layer of quinodimethane molecules spread on the water surface in a Langmuir-Blodgett trough until the area per uniaxially aligned molecule is less than about 55 .ANG..sup.2 /molecule;
- (2) reducing the compression on the monomolecular layer by about 5-40 dynes per centimeter;
- and (3) dip-coating the substrate with the monomolecular layer while maintaining a constant compression on the area of uniaxially aligned quinodimethane molecules spread on the water surface.
A process for preparing a nonlinear optical medium which comprises coating a transparent solid substrate surface by Langmuir-Blodgett deposition technique with a continuous film of at least one monomolecular layer of uniaxially aligned quinodimethane molecules corresponding to the formula:
- ##STR6## where R is a substituent selected from aliphatic, alicyclic and aromatic groups containing between about 6-30 carbon atoms, and R.sup.1 is hydrogen or a R substituent;
- wherein the deposition technique comprises (1) compressing the monomolecular layer of quinodimethane molecules spread on the water surface in a Langmuir-Blodgett trough until the area per uniaxial aligned molecule is less than about 55 .ANG..sup.2 /molecule;
- (2) reducing the compression on the monomolecular layer by about 5-40 dynes per centimeter;
- and (3) dip-coating the substrate with the monomolecular layer while maintaining a constant compression on the area of uniaxially aligned quinodimethane molecules spread on the water surface.
A process for preparing a nonlinear optical medium which comprises coating a transparent solid substrate surface by Langmuir-Blodgett deposition technique with a continuous film of at least one monomolecular layer of uniaxially aligned quinodimethane molecules corresponding to the formula:
- ##STR7## where R is a substituent selected from aliphatic, alicyclic and aromatic groups containing between about 6-30 carbon atoms, and R.sup.1 is hydrogen or a R substituent;
- wherein the deposition technique comprises (1) compressing the monomolecular layer of quinodimethane molecules spread on the water surface in a Langmuir-Blodgett trough until the area per uniaxial aligned molecule is less than about 55 .ANG..sup.2 /molecule;
- (2) reducing the compression on the monomolecular layer by about 5-40 dynes per centimeter;
- and (3) dip-coating the substrate with the monomolecular layer while maintaining a constant compression on the area of uniaxially aligned quinodimethane molecules spread on the water surface.
Dependencies are inferred from the claim text.