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1.
Int J Biol Macromol ; : 137076, 2024 Oct 29.
Artigo em Inglês | MEDLINE | ID: mdl-39481713

RESUMO

Nanostructured inorganic/wood-structural holocellulose hybrids offer new potential applications, including mechanical energy conversion, superhydrophobic materials, gas adsorption and so on. Owing to the anisotropy of wood, controlled the morphology of mineral particles inside porous holocellulose scaffold is still far from satisfactory. In this work, a homogeneous zinc oxide (ZnO) decoration inside wood-structural holocellulose scaffold was presented while the morphology, distribution and content of ZnO micro-nano particles were controllable through changing the conditions of hydrothermal growth. The holocellulose scaffold was prepared through delignification and periodate oxidation, which is favorable for Zn2+ capture and ZnO nuclei form because of the surface charge increased. The controlled ZnO insertion were realized by changing metal salt concentration, temperature and hydrothermal time. The obtained multilayer ZnO could provide multiple light refractions and reflections and enhance the utilization of light. Consequently, with a minor ZnO loading (15 wt%), the ZnO/wood-structural hybrids could totally degraded methyl orange and methyl blue in 6 h. This novel and scalable synthesis method shows potential in both the design and photocatalytic activity of holocellulose hybrids.

2.
ACS Appl Mater Interfaces ; 16(17): 21672-21688, 2024 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-38637290

RESUMO

Titanium (Ti) and its alloys are widely used as hard tissue substitutes in dentistry and orthopedics, but their low bioactivity leads to undesirable osseointegration defects in the early osteogenic phase. Surface modification is an important approach to overcome these problems. In the present study, novel magnesium phosphate (MgP) coatings with controllable structures were fabricated on the surface of Ti using the phosphate chemical conversion (PCC) method. The effects of the microstructure on the physicochemical and biological properties of the coatings on Ti were researched. The results indicated that accelerators in PCC solution were important factors affecting the microstructure and properties of the MgP coatings. In addition, the coated Ti exhibited excellent hydrophilicity, high bonding strength, and good corrosion resistance. Moreover, the biological results showed that the MgP coatings could improve the spread, proliferation, and osteogenic differentiation of mouse osteoblast cells (MC3T3-E1) and vascular differentiation of human umbilical vein endothelial cells (HUVECs), indicating that the coated Ti samples had a great effect on promoting osteogenesis and angiogenesis. Overall, this study provided a new research idea for the surface modification of conventional Ti to enhance osteogenesis and angiogenesis in different bone types for potential biomedical applications.


Assuntos
Diferenciação Celular , Proliferação de Células , Materiais Revestidos Biocompatíveis , Células Endoteliais da Veia Umbilical Humana , Compostos de Magnésio , Neovascularização Fisiológica , Osteogênese , Fosfatos , Titânio , Titânio/química , Titânio/farmacologia , Osteogênese/efeitos dos fármacos , Animais , Camundongos , Células Endoteliais da Veia Umbilical Humana/efeitos dos fármacos , Humanos , Materiais Revestidos Biocompatíveis/química , Materiais Revestidos Biocompatíveis/farmacologia , Fosfatos/química , Fosfatos/farmacologia , Compostos de Magnésio/química , Compostos de Magnésio/farmacologia , Diferenciação Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Neovascularização Fisiológica/efeitos dos fármacos , Osteoblastos/efeitos dos fármacos , Osteoblastos/citologia , Propriedades de Superfície , Linhagem Celular , Angiogênese
3.
Carbohydr Polym ; 328: 121749, 2024 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-38220317

RESUMO

This study presents a novel and environmentally friendly method for producing cellulose microspheres (CM) with controllable morphology and size using electrostatic droplets. The traditional droplet method for CM production requires complex equipment and harmful reagents. In contrast, the proposed method offers a simple electrostatic droplet approach to fabricate CM10 at 10 kV, which exhibited a smaller volume, linear microscopic morphology, and a larger specific surface area, with a 36.60 % improvement compared to CM0 (prepared at 0 kV). CM10 also demonstrated excellent underwater structural stability, recovering in just 0.5 s, and exhibited the highest adsorption capacity for Cr(VI) at 190.16 mg/g, a 72.15 % improvement over CM0. This enhanced adsorption capacity can be attributed to the unique structure of CM10 and the introduction of more amino groups. Moreover, CM10 displayed good cyclic adsorption capacity and high dynamic adsorption efficiency, making it highly suitable for practical applications. CM10 exhibited remarkable adsorption capacity, stability, and practical value in treating Cr(VI) wastewater. This work proposes a simple and eco-friendly method for producing CM with excellent structural controllability and stability, providing an effective route for wastewater treatment.

4.
Materials (Basel) ; 15(19)2022 Sep 25.
Artigo em Inglês | MEDLINE | ID: mdl-36233992

RESUMO

A series of novel ferrite carbon nanomaterials are considered to obtain the potential advantages in elimination of the electromagnetic interference effects. Herein, the iron nanoparticles coated on amorphous carbon were prepared by facile agar-gel synthesis. Meanwhile, the synergy between carbon supporting and ferrite nanomaterials could be proved to promote the absorption properties. Among all samples, the iron nanoparticles coated on amorphous carbon show the highest microwave absorption properties, achieving the maximum reflection loss (RL) of -14.3 dB at 6 GHz (5.5-milimeter thickness), and the bandwidths over -10 dB (90% absorption) was 2.5 GHz. Combining analysis results, it is confirmed that the as-prepared iron nanoparticles have the highest surface area, homogeneous distribution, abundant defect, and well-defined pore structure, which could significantly affect the absorption properties at 6 GHz. Furthermore, the abundant defects derived from the interface were the essential reason for the improved absorption properties. Overall, it provided a new strategy to design an effective method to absorb nanomaterials for the elimination of electromagnetic interference, especially the coordination of metal species and carbon supporting.

5.
Bioresour Technol ; 142: 741-4, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23773835

RESUMO

As the most representative biodegradable thermoplastic, poly(3-hydroxybutyrate) (P3HB) has a limited range of applications because of its poor thermal and physical properties. To improve its properties, a novel biosynthetic system was designed to produce poly(3-hydroxypropionate-co-3-hydroxybutyrate) (P(3HP-co-3HB)) with fully controllable structures from inexpensive carbon source. In this system, two parallel synthetic pathways controlled by independent regulatory systems were used to produce the 3HP and 3HB monomers, respectively. Through tuning the expression level of appropriate genes, P(3HP-co-3HB) copolyesters were synthesized with a wide range of 3HP fraction from 11.5 mol% to 94.6 mol%. Differential scanning calorimetry analysis demonstrated that the thermal properties of P(3HP-co-3HB) copolymer were totally dependent on its composition. The bioreactor cultivation was also performed and accumulated 9.8 g/L P(48.2 mol% 3HP-co-3HB) using glycerol as sole carbon source, which represented the highest production so far.


Assuntos
Glicerol/química , Hidroxibutiratos/metabolismo , Poliésteres/metabolismo
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