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Nature-inspired porous structures are highly desired in the fields of new materials, sustainable energy, biological & chemical science, etc. Here, a new strategy for the fabrication of continuous, gradient nanoporous polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) film is established. The continuous nanopore gradient along the direction of film thickness (~120 μm) is achieved via delayed directional diffusion of dynamic binary solvent of ethanol/water and selective swelling of P2VP domains. Ethanol in binary solvent diffuses into the film from one side to another, which is retarded by the water gate as water is concentrated at the film surface. The delayed diffusion matches the swelling rate of P2VP domains, forming the continuous nanopore gradient normal to the film surface.
This article was published in the following journal.
Name: Langmuir : the ACS journal of surfaces and colloids
Janus/gradient actuating materials have become promising candidates for actuating devices. The fabrication of functional Janus gradient actuators remains a challenge. This paper presents a facile fabr...
To further reduce the noise and artifacts in the reconstructed image of sparse-view CT, we have modified the traditional total variation (TV) methods, which only calculate the gradient variations in x...
Controlled propulsion of liquid droplets on a solid surface offers important applications in various fields, including fog harvesting, heat transfer, microfluidics and micro device technologies. The p...
Understanding the behavior of combinatorially developed luminescent materials requires detailed characterization methods that have been lacking thus far. We developed a device for directly surveying t...
Isotropic diffusion encoding efficiently encodes additional microstructural information in combination with conventional linear diffusion encoding. However, the gradient-intensive isotropic diffusion ...
The purpose of this research project is to determine whether or not the directional movement of spermatozoa is influenced by a pH gradient by examining spermatozoa in vitro.
Dry Eye Syndrome (DES) is a disease affects the production and stability of the tear film, leading to vision disturbances and a major decrease in quality of life. The most recommended trea...
The purpose of this study is to investigate the clinical efficacy of directional DBS electrode technology and whether electrophysiology biomarkers can predict effective contact segments fo...
This is a phase I randomized trial assessing the safety of a single vaginal placebo film application. In order to develop a vaginal film which can provide extended release of an Antiretrov...
To discover new information about MRI(magnetic resonance imaging)called DWI (diffusion weighted imaging) and its ability to diagnose cardiac scarring. CMR-DE (cardiac magnetic resonance w...
A technique used to separate particles according to their densities in a continuous density gradient. The sample is usually mixed with a solution of known gradient materials and subjected to centrifugation. Each particle sediments to the position at which the gradient density is equal to its own. The range of the density gradient is usually greater than that of the sample particles. It is used in purifying biological materials such as proteins, nucleic acids, organelles, and cell types.
Use of a device (film badge) for measuring exposure of individuals to radiation. It is usually made of metal, plastic, or paper and loaded with one or more pieces of x-ray film.
A diagnostic technique that incorporates the measurement of molecular diffusion (such as water or metabolites) for tissue assessment by MRI. The degree of molecular movement can be measured by changes of apparent diffusion coefficient (ADC) with time, as reflected by tissue microstructure. Diffusion MRI has been used to study BRAIN ISCHEMIA and tumor response to treatment.
The use of diffusion ANISOTROPY data from diffusion magnetic resonance imaging results to construct images based on the direction of the faster diffusing molecules.
Separation of particles according to density by employing a gradient of varying densities. At equilibrium each particle settles in the gradient at a point equal to its density. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Biological therapy involves the use of living organisms, substances derived from living organisms, or laboratory-produced versions of such substances to treat disease. Some biological therapies for cancer use vaccines or bacteria to stimulate the body&rs...