RSC Advances
·
2016
·Vol. 6
·期 14
·11204-11210
·
IF 3.289
Yawei Sun,Yaopeng Zhang,Jingjing Liu,Fuqiang Nie
In this work, hydrogel photonic crystal beads with inverse opal structure are generated on a well-controlled microfluidic chip device. An online droplet drying method and templating technique are integrated into the producing process. This process results in the silica nanoparticles in the droplets self-assembled into spherical photonic crystals with narrow stop bands and identical structural colours, which is the ideal template for fabricating inverse opal hydrogel beads. The effects of acrylic acid (AA) concentration, water dosage and buffer pH on the equilibrium swelling of inverse opal hydrogel are discussed. In the concentration of AA (3%) and water (31%), the inverse opal hydrogel beads show wide sensing range and rapid response (less than 30 s) to pH variation. Overall, the inverse opal hydrogels as pH sensors show homogeneous structural colour changes due to the spherical 3D structure. The present characterization of quite mechanically robust and good reproducibility for the spherical pH sensor may have promise application in advanced optical devices.
研究领域:
生物医学工程
·
材料科学
·
分析化学
·
微纳制造
·
传感技术
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2023
·
IF 1.4
Wen-jie Tang,Jin-xin Zhang,Liang Liu,Lu-yao Zhao,Liu Wang,Chang Shi,Yang Liu,Mei-ling Wen
Calcium alginate gel microspheres exhibiting pH response release characteristics were prepared, and utilizing Bovine serum albumin (BSA) to evaluate drug release performance. Hydrogels composed of gelatin (GL) and sodium alginate oxide (NALO), with varying ratios (7:3; 4:1; 3:2) were prepared by controlling their composition. Scanning electron microscopy (SEM) and a microplate reader (ELIASA) were used to characterize the microspheres’ microstructure and in vitro BSA release behavior, respectively. The results demonstrated that, under acidic conditions, the BSA release was slower than in neutral conditions. The hydrogels’ physical and chemical properties were analyzed using optical microscopy, Fourier transform infrared spectroscopy (FTIR), swelling experiments and mechanical testing of the hydrogels and microsphere loaded hydrogels. The results showed that a GL to NALO ratio of 7:3 increased the swelling degree, while a 4:1 ratio optimized the mechanical characteristics. The study concluded that the microsphere-loaded hydrogels exhibited significant potential for human drug delivery applications.
研究领域:
生物医学工程
·
药学
·
材料科学
·
高分子科学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2018
·Vol. 34
·期 3
·500-505
·
IF 1.248
Liu Li,Pan Ge,Wang Licheng,Ren Xiuyan,Zhang Xinyue,Wu Guangfeng
Polystyrene nanoparticles with negative charges(n-PSs) were synthesized using styrene(St) and sodium styrene sulfonate(NaSS) as initial materials by surfactant-free emulsion polymerization. Subsequently, a hybrid hydrogel was prepared using acrylamide(AAm) and methacryloyloxyethyltrimethyl ammonium chloride(DMC) as co-monomers with N , N ′-methylenebisacrylamide(MBA) as a chemical crosslinker and n-PSs as a physical electro- static interaction agent. The resulting hybrid hydrogels exhibited excellent tensile strength and elongation at break. The tensile stress of hybrid hydrogels was seven times greater than that of hydrogels without n-PSs. The elongation at break of hydrogels reached 700%, which was much higher compared to those of the hydrogels without n-PSs. Furthermore, swelling measurements of the hydrogels indicate that there is an overshoot in the swelling process and the extent of overshoot decreases with the increasing n-PSs. Therefore, the work presented here provides a method for improving the mechanical properties of hydrogels via the introduction of polymeric nanoparticles.
研究领域:
材料科学
·
高分子科学
·
纳米技术
·
材料力学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 59
·期 2
·715-727
·
IF 4.5
Li Bin,Zhou Mengjing,Wu Aolin,Liu Haiying,Du Li,Su Lihua
Preparation of composite hydrogels by in situ polymerization (SP) using choline chloride (ChCl), acrylamide (AM), and urea (U) as raw materials for deep eutectic solvent (DES), with the introduction of PVA and PVDF as fillers into DES. Characterization of the composite hydrogels was conducted using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). This study analyzed the pressure sensitivity, piezoelectricity, swelling behavior, and mechanical properties of the composite hydrogels. The results indicate that due to the dipole–dipole interactions between PVA and PVDF, the composite hydrogels exhibit excellent pressure sensitivity and piezoelectric performance. When the ratio of PVA to PVDF is 1:1, the composite hydrogels exhibit optimal performance, with a 3.37-fold increase in pressure sensitivity and a 6.49-fold increase in piezoelectricity compared to other ratios. This research provides a method for preparing composite hydrogels with excellent piezoelectric performance and pressure sensitivity.
研究领域:
材料科学
·
高分子科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）