瓦特光聚合CeO2 - 集成的水凝支架具有抗菌功效
Nelly Aimelyne Mpuhwe1,2, Gyu-Nam Kim1,2, Young-Hag Koh1,2
1School of Biomedical Engineering, Korea University, Seoul 02841, Republic of Korea.
Materials (Basel, Switzerland)
|March 13, 2025
概括
这项研究开发了新的凝甲基烯基 (GelMA) /多聚乙烯基醇) 二烯酸盐 (PEGDA) -氧化 (CeO2) 水凝支架,使用光聚合. 这些支架具有显著的抗微生物特性和可调节的机械和生物特性,可用于先进的应用.
科学领域:
- 生物材料科学 生物材料科学
- 材料化学 材料化学
- 纳米技术纳米技术
背景情况:
- 开发具有抗微生物特性的先进水凝支架对于组织工程和再生医学至关重要.
- 氧化 (CeO2) 纳米粒子具有独特的氧化还原特性,有利于抗菌应用.
- 将CeO2与GelMA和PEGDA等生物相容的水凝相结合,为功能生物材料提供了一个有前途的战略.
研究的目的:
- 为了合成和表征凝甲烯基 (GelMA) /多聚乙烯基醇) 二烯酸盐 (PEGDA) -氧化 (CeO2) 水凝油墨.
- 用于制造使用光聚合的抗微生物水凝支架.
- 为了优化CeO2含量,以达到所需的机械,胀,生物降解和抗菌性质.
主要方法:
- 在600°C下通过沉和化合成圆形CeO2纳米粒子.
- 使用不同CeO2度 (0-5%w/v) 的容器光聚合制造GelMA/PEGDA-CeO2水凝支架.
- 光聚合的特征,机械强度,胀,生物降解和抗菌疗效.
主要成果:
- CeO2纳米颗粒表现出高结晶性和对抗微生物活性所需的Ce3+/Ce4+氧化状态.
- 使用5% w/v CeO2 的水凝支架显示压力强度为0.56 ± 0.09 MPa,模量为0.19 ± 0.03 MPa.
- 5%的CeO2支架显示出高胀率 (1063.3±10.9%),受控的生物降解 (28天后剩余体重39.6±2.3%),以及卓越的抗菌疗效 (76±44.6×10^3 CFU).
- 瓦特光聚合使得可以制造具有受控结构的宏水凝支架.
结论:
- 通过光聚合制造的GelMA/PEGDA-CeO2水凝支架具有卓越的抗菌功效.
- 开发的水凝系统提供了可调节的机械和生物特性,适合各种生物医学应用.
- 这种方法为创建功能性,宏的抗微生物生物材料提供了一个多功能平台.
相关概念视频
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
00:57Cationic Chain-Growth Polymerization: Mechanism
2.2K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.2K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.0K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
01:20Types of Step-Growth Polymers: Polyesters
2.2K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.2K
01:17Thermal Electrocyclic Reactions: Stereochemistry
2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.0K