Photolithography Master
Photolithography Master - Related Videos
07:44
Microfabrication via Photolithography
0 Views •
2023
The fabrication of BioMEM devices is often done using a microfabrication technique called photolithography. This widely used method utilizes light to transfer a pattern onto a silicon wafer, and provides the basis for the fabrication of many types of BioMEM devices. This video presents the photolithography technique, shows how the process is performed in the cleanroom, and introduces some applications of the process.
02:23
Master Transcription Regulators
0 Views •
2020
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
02:23
Master Transcription Regulators
0 Views •
2023
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
10:18
Multi-step Variable Height Photolithography for Valved Multilayer Microfluidic Devices
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Cited by 26 •
2017
Multilayer microfluidic devices often involve the fabrication of master molds with complex geometries for functionality. This article presents a complete protocol for multi-step photolithography with valves and variable height features tunable to any application. As a demonstration, we fabricate a microfluidic droplet generator capable of producing hydrogel beads.
08:15
Polymeric Microneedle Array Fabrication by Photolithography
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Cited by 24 •
2015
Here, we present a protocol describing a mold-free fabrication process of the polymeric microneedles by photolithography.
FAQs
Exposure through the patterned mask changes the chemistry of selected photoresist regions. During development, those regions either become removable or remain, depending on how the resist responds, so the final surface relief reproduces the intended pattern. This exposure-development sequence converts optical pattern information into physical features that can guide later microscale biological structures.
The result depends on how each photoresist region responds chemically to light exposure. Development then distinguishes between altered and unaltered areas, removing one set or retaining it to create the desired relief. Controlling this relationship between exposure and development is essential because it determines which parts of the patterned design become available for forming biological or engineering structures.
The geometry encoded in the master can establish microscale features that affect fluid flow, cell positioning, or tissue organization. As a result, the pattern is not merely a visual layout; it becomes a physical constraint within an experimental platform. Researchers can therefore examine cellular behavior or tissue-like organization under more reproducible spatial conditions.
A patterned mask is placed over a light-sensitive photoresist, and selected regions are exposed to light. The exposed pattern changes the resist chemistry, after which development removes or preserves defined areas. The remaining surface relief forms the master’s microscale pattern, which can then guide the creation of channels, substrates, or related structures.
This approach is useful when an experiment requires repeatable microscale control over fluid movement, cell location, or tissue-like organization. In biology, masters can support platforms for studying cellular behavior, developing diagnostic devices, and engineering tissue-like systems. Their patterned relief helps translate a designed geometry into a consistent experimental environment across repeated studies.
A master can guide replication of microfluidic channels, cell-culture substrates, and other patterned structures. These platforms provide physical features that regulate fluid flow, position cells, or organize tissue-like arrangements. The resulting systems support controlled investigations of cellular behavior and can also serve as foundations for diagnostic-device development and tissue-engineering studies.