University of Illinois

Jeffrey D Eisenhaure

Seok Kim

Jun Kyu Park

A composite dry adhesive includes (a) an adhesive layer comprising a shape memory polymer and (b) a resistive heating layer comprising a shape memory polymer composite on the adhesive layer. The shape memory polymer composite includes conductive particles dispersed in a shape memory polymer matrix, where the conductive particles have a concentration sufficient to form a conductive path through the resistive heating layer.

Composite dry adhesive and methods of making and using a composite dry adhesive

A reusable attaching apparatus includes (a) a reversible adhesive comprising a shape memory polymer and (b) a mounting structure bonded to the reversible adhesive. The shape memory polymer has a glass transition temperature (T) and comprises a deformable state at temperatures above the Tand a rigid state at temperatures below the T.

Reusable attaching apparatus and methods of making and using a reusable attaching apparatus

A method of transfer printing comprises globally heating an array of stamps, where each stamp comprises a shape memory polymer with a light absorbing agent dispersed therein, and pressing the array of stamps to a donor substrate comprising a plurality of inks. Each stamp is thereby compressed from an undeformed adhesion-off configuration to a deformed adhesion-on configuration. The array of stamps is then cooled to rigidize the shape memory polymer and bind the plurality of inks to the stamps in the deformed adhesion-on configuration. The plurality of inks remain bound to the stamps while the array of stamps is positioned in proximity with a receiving substrate. A selected stamp in the array is then locally heated using a concentrated light source. The selected stamp returns to the undeformed adhesion-off configuration, and the ink bound to the selected stamp is released and transfer printed onto the receiving substrate.

Transfer printing using shape memory polymers

A microscale stamp for transfer printing includes (a) a stamp body comprising a shape memory polymer having a glass transition temperature (T) and (b) one or more protruding structures attached to a surface of the stamp body. The shape memory polymer comprises a deformable state at temperatures above Tand a rigid state at temperatures below T. The one or more protruding structures comprise a material which is different from the shape memory polymer and which has a Young's modulus greater than a storage modulus of the shape memory polymer.

Growing community of inventors

Champaign, IL, United States of America

Jeffrey D Eisenhaure