Related Experiment Video
Updated: Feb 13, 2026
05:47
Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
8.1K
Photo-responsive membrane surface: Switching from bactericidal to bacteria-resistant property
Yi Xie1, Shengqiu Chen1, Yihui Qian1
1College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China.
Summary
Researchers developed a novel photo-responsive membrane using atom transfer radical polymerization (ATRP) and click chemistry. This innovative material exhibits both bactericidal and bacteria-resistant properties, offering a new strategy for controlling bacterial adhesion.
Area of Science:
- Materials Science
- Polymer Chemistry
- Surface Chemistry
Background:
- Bacterial adhesion on membranes leads to fouling and reduced efficiency.
- Developing antimicrobial and anti-fouling surfaces is crucial for various applications.
- Photo-responsive materials offer tunable surface properties for dynamic control.
Purpose of the Study:
- To create a photo-responsive membrane with combined bactericidal and bacteria-resistant properties.
- To investigate the surface transformation and its impact on bacterial adhesion.
- To explore a new strategy for antibacterial surface design.
Main Methods:
- Synthesis of azide-functionalized polycationic polymer (PDMAEMA-NBE) via atom transfer radical polymerization (ATRP).
- Grafting of PDMAEMA-NBE onto alkynyl-functionalized polyethersulfone (PES) membrane using click chemistry.
- Characterization of surface modification using X-ray photoelectron spectroscopy (XPS).
- Evaluation of photo-induced surface property changes (zeta potential, water contact angle) upon UV irradiation.
Main Results:
- Successfully prepared a photo-responsive membrane by integrating ATRP and click chemistry.
- Confirmed surface modification and demonstrated UV-induced switching from polycationic to polyzwitterionic surface.
- Observed significant changes in zeta potential (from +14.7 to -3.8mV) and water contact angle (from 64.0° to 52.7°).
- Demonstrated excellent bactericidal activity of the polycationic surface and UV-induced detachment of dead bacteria from the polyzwitterionic surface.
Conclusions:
- The developed photo-responsive membrane exhibits tunable surface properties upon UV irradiation.
- The material shows effective bactericidal action and controlled bacterial detachment, offering a promising approach for antibacterial adhesion management.
- This strategy provides a novel pathway for designing advanced antibacterial surfaces for diverse applications.
Related Concept Videos
01:18Surface Membrane Barriers
3.0K
The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
3.0K
01:16Response Surface Methodology
682
Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
The process of RSM involves several key steps:
The process of RSM involves several key steps:
682
01:30Other Stress Responses in Bacteria
443
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
443
01:27Plasma Membrane in Bacteria and Archaea
2.1K
The plasma membrane is an essential cellular structure responsible for maintaining cellular integrity and regulating the selective transport of molecules. While bacteria and archaea share the fundamental function of plasma membranes, their structural and molecular differences reflect adaptations to distinct ecological and physiological challenges.Bacterial Plasma MembranesBacterial plasma membranes are predominantly composed of phospholipids with fatty acid chains ester-linked to a glycerol...
2.1K
01:22Switching of BJT
876
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
876
02:57Surface Tension, Capillary Action, and Viscosity
33.6K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
33.6K