Peregrine C. G. Greenhope, Joshua Loh, Katie A. Gilmour, Meng Zhang, Luke Haworth, Ming Xie, Martyn Dade-Robertson, Yunhong Jiang
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The width of fibres in the microstructure of BC was measured using SEM. Two different silicon modifications were used to modify the BC, it was shown that the TMOS modification decreased the tensile strength but that the TEOS increased the tensile strength of the BC fibres compared to plain BC. In addition, we found that the washing conditions of 1% NaOH (w/v), industrial methylated spirit (IMS), and deionised water (DI) showed some impact on the properties of the samples, particularly the IMS produced a reduced contact angle in the modified samples. However, the contact angle increased in the case of TEOS modification with the NaOH wash. 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引用次数: 0
摘要
在这项研究中,我们探讨了如何利用原位生物处理技术生产并用硅添加剂对细菌纤维素(BC)进行表面改性。我们研究了细菌纤维素的表面特性和拉伸强度,并将其与普通细菌纤维素进行了比较。通过光密度测量评估了改性对细菌存活率的影响,结果发现,添加改性后,原硅酸四甲酯(TMOS)的生长速度略有减慢,而原硅酸四乙酯(TEOS)的生长速度则没有受到影响。利用傅立叶变换红外光谱(FTIR)和电离辐射增强光谱(EDX)对改性 BC 进行了表征,证实了材料中硅的存在。使用扫描电子显微镜测量了 BC 微结构中纤维的宽度。我们使用了两种不同的硅改性来改性 BC,结果表明,与普通 BC 相比,TMOS 改性降低了 BC 纤维的抗拉强度,而 TEOS 则提高了 BC 纤维的抗拉强度。此外,我们还发现,1% NaOH(w/v)、工业甲醇(IMS)和去离子水(DI)的洗涤条件对样品的性能有一定的影响,尤其是 IMS 使改性样品的接触角减小。然而,在用 NaOH 冲洗改性 TEOS 的情况下,接触角会增大。总之,这项研究展示了一种使用硅添加剂对 BC 材料进行原位改性的新方法,这种改性可提高拉伸强度,并具有可调整水相互作用的潜力。
Silicon-infused bacterial cellulose: in situ bioprocessing for tailored strength and surface characteristics
In this study we investigate the use of in situ bioprocessing for the production and surface modification of bacterial cellulose (BC) with silicon additives. The surface properties and tensile strength of the BC were studied and compared with plain BC. The effect the modification exhibited on the survivability of the bacteria was assessed by optical density measurements and found that the addition of the modification marginally slowed growth in the case of Tetramethyl orthosilicate (TMOS) and did not affect the growth in the case of Tetraethyl orthosilicate (TEOS). Characterisation of the modified BC was carried out using FTIR, EDX and confirmed the presence of silicon in the material. The width of fibres in the microstructure of BC was measured using SEM. Two different silicon modifications were used to modify the BC, it was shown that the TMOS modification decreased the tensile strength but that the TEOS increased the tensile strength of the BC fibres compared to plain BC. In addition, we found that the washing conditions of 1% NaOH (w/v), industrial methylated spirit (IMS), and deionised water (DI) showed some impact on the properties of the samples, particularly the IMS produced a reduced contact angle in the modified samples. However, the contact angle increased in the case of TEOS modification with the NaOH wash. In conclusion this study shows a novel method of modifying BC materials in-situ using silicon additives for increased tensile strength and the potential for tuneable hydro interactions.
期刊介绍:
Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.