Hydrophobicity of hemp shiv treated with sol-gel coatings

Hussain, Atif; Calabria-Holley, Juliana; Schorr, Diane; Jiang, Yunhong; Lawrence, Michael B.; Blanchet, Pierre

doi:10.1016/j.apsusc.2017.10.210

Cited by 30 publications

(24 citation statements)

References 26 publications

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“…The drying temperature of hemp shiv was purposefully chosen lower than that used to dry the glass slides in Chapter 4 in order to reduce their moisture content as much as possible (Hussain, Calabria-Holley, Schorr, et al 2018) without degrading the shiv (see Section 6.3.1), as well as to remain consistent with the drying method followed by Jiang, Bourebrab, et al (2018).…”

Section: Methodsmentioning

confidence: 99%

“…When silica-derived thin-film gels were applied on hemp shiv, Hussain, Calabria-Holley, Schorr, et al (2018) successfully demonstrated the gained hydrophobic properties by chemical modification. However by its nature, the coating was a dynamic system which might be prone to gelling, which induces shelf-life requirements that might hinder its industrialisation.…”

Section: Knowledge Gapmentioning

confidence: 99%

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Improvement of Water Resistance of Hemp Woody Substrates through Deposition of Functionalized Silica Hydrophobic Coating, While Retaining Excellent Moisture Buffering Properties

Jiang

Bourebrab

Sid

et al. 2018

ACS Sustainable Chem. Eng.

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Section: Methodsmentioning

confidence: 99%

Section: Knowledge Gapmentioning

confidence: 99%

Improvement of Water Resistance of Hemp Woody Substrates through Deposition of Functionalized Silica Hydrophobic Coating, While Retaining Excellent Moisture Buffering Properties

Jiang

Bourebrab

Sid

et al. 2018

ACS Sustainable Chem. Eng.

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“…The gel time of the prepared sol was 101 days when stored in a sealed vial at 20 °C. The coating formulation and the dipping time has been reported to deposit uniform crack free coatings on hemp in our recently published paper [23].…”

Section: Coating Preparationmentioning

confidence: 99%

Resilient hemp shiv aggregates with engineered hygroscopic properties for the building industry

Hussain

Calabria-Holley

Lawrence

et al. 2019

Construction and Building Materials

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This study focuses on the surface treatment of an extremely hydrophilic natural plant material, hemp shiv, using a functionalised silica based coating to provide hydrophobicity while retaining its moisture buffering ability. The chemical composition and physical structure of bio-based materials results in their extremely hydrophilic behaviour. In this work, a simple one step coating process was used to enhance the water-repellence of hemp shiv without compromising its ability to adsorb and release moisture. The coating modified the morphology and surface roughness of hemp shiv providing a hydrophobic surface having a water contact angle of 118° and reduced the bulk water absorption by 250% over 24 hours. Mercury intrusion porosimetry (MIP) showed that the treatment refined the pore size distribution of hemp shiv, reducing the size of larger pores but not completely blocking the smaller pores thereby allowing hemp shiv to buffer moisture. Fourier-transform infrared spectroscopy (FTIR) revealed the chemical composition was modified by the coating, reducing the hydroxyl groups. Hemp shiv aggregates treated with functionalised silica based coating show potential for the development of robust lightweight building materials with enhanced hydrophobicity.

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“…HS are generally very porous with low density tending to absorb large amounts of water. Previous studies have reported that HS not only has higher water absorption rate but also absorb high amounts of water in the very first minutes compared to different plant materials (Hussain et al, 2018;Bourdot et al, 2017). Moreover, the presence of cellulose, hemicellulose and lignin in bio-based materials contributes to the presence of hydroxyl groups in their structure.…”

Section: Introductionmentioning

confidence: 98%

Mechanical performance of biodegradable hemp shivs and corn starch-based biocomposite boards

Kremensas

Kairytė

Vaitkus

et al. 2019

Modern Building Materials, Structures and Techniques (MBMST)

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For the production of traditional building materials, excavated natural resources are used. The production process of such materials requires high-energy demands, wherefore, high amounts of CO2 gases, which have a great impact on climate change, are emitted. Only a small part of such materials is effectively recycled and reused. Generally, they are transported to landfills, which rapidly expand and may pollute the soil, groundwater and air. Currently, a great attention is paid to the production of novel building materials. The aim is to use as less excavated materials as possible and replace them by natural renewable resources. Therefore, the recycling and utilisation at the end of life cycle of such materials would be easier and generation of waste would reduce. This way, the efforts of switching to circular economy are being put. One of the approaches -wider application of vegetable-based raw materials (cultivated and uncultivated agricultural plants). The usage of fibre hemp shives (HS) as an aggregate and corn stach (CS) as a binding material allows development of biocomposite boards (WPCs) which could contribute to the solution of the before mentioned problems. Bio-sourced materials combined with a polymer matrix offer an interesting alternative to traditional building materials. To contribute to their wider acceptance and application, an investigation into the use of wood-polymer composite boards is presented. In this study, biocomposite boards for the building industry are reported. WPCa are fabricated using a dry incorporation method of corn starch and HS treatment with water at 100 °C. The amount of CS and the size of the HS fraction are evaluated by means of compressive, bending and tensile strength, as well as microstructure. The results show that the rational amount of CS, independently on HS fraction, is 10 wt.%. The obtained WPCs have compressive stress at 10% of deformation in the range of (2.4-3.0) MPa, bending of (4.4-6.3) MPa and tensile strength of (0.23-0.45) MPa. Additionally, the microstructural analysis shows that 10 wt.% of CS forms a sufficient amount of contact zones that strengthen the final product. The obtained average density (~319-408 kg/m 3 ) indicate that, according to European normative document EN 316, WPCs can be classified as softboards and used as self-bearing structural material for building industry. Based on the requirements, WPCs can be applied in dry and humid conditions for the internal and external uses without loading (EN 622-4, section 4.2) or as load-bearing boards in dry and humid conditions for instantaneous or short-term load duration (EN 622-4, section 4.3).

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Hydrophobicity of hemp shiv treated with sol-gel coatings

Cited by 30 publications

References 26 publications

Improvement of Water Resistance of Hemp Woody Substrates through Deposition of Functionalized Silica Hydrophobic Coating, While Retaining Excellent Moisture Buffering Properties

Improvement of Water Resistance of Hemp Woody Substrates through Deposition of Functionalized Silica Hydrophobic Coating, While Retaining Excellent Moisture Buffering Properties

Resilient hemp shiv aggregates with engineered hygroscopic properties for the building industry

Mechanical performance of biodegradable hemp shivs and corn starch-based biocomposite boards

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