Fabrication of durable hydrophobic cellulose surface from silane‐functionalized silica hydrosol via electrochemically assisted deposition

Abstract

Durable excellent hydrophobic surface on cellulose substrate was fabricated from the silica hydrosol functionalized with silane chemicals by a facile electrochemically assisted deposition technique. The silica hydrosol was synthesized using tetraethoxysilane (TEOS) as the precursor and sodium dodecylbenzene (SDBS) as the emulsifier under acidic conditions. The hydrophobic silane modifiers including octyltriethoxysiliane (OTES), dodecyltriethoxysiliane (DTES) and isooctyltriethoxysiliane (iso-OTES) and the silane-coupling agent c-mercaptopropyltriethoxysilane (MPTES) were used to dope the silica hydrosol for preparing durable hydrophobic cellulose surface. The cellulose surface modified with silane modifier iso-OTES exhibited the best hydrophobicity with water contact angle of 162.3 6 0.58 due to its non-polar and hydrolytically stable of ASi(C 8 H 17 ) groups. The addition of silane-coupling agent MPTES containing the ASH group led to good durability of hydrophobicity with water contact angle of 130.0 6 1.28 after 20 washing times.

Multi‐Stimuli Nanocomposite Therapeutic: Docetaxel Targeted Delivery and Synergies in Treatment of Human Breast Cancer Tumor

“…[ 58 ] In the Au/Fe 3 O 4 /PVA‐10%DXL preparation process, hydroxyl groups of the PVA network are modified by MPTES to increase the hydrophobicity by effectively replacing OH groups by propyl moieties. [ 59 ] Contact angle measurements were carried out to confirm the effect of surface modification by MPTES on the hydrophobicity of Au/Fe 3 O 4 /PVA‐10%DXL (Figure S7, Supporting Information). For product 1 , the water contact angle was (92 ± 1.5)°.…”

Spiro-cyclotriphosphazene with three functional end groups: synthesis and structure characterization of new polycyclotriphosphazenes with Schiff-base groups

“…W wyniku reakcji trialdehydo cyklotrifosfazenów z trzema różnymi dianilinami (benzydyna, 4,4'-metylenodianilina i 4,4'-sulfonylodianilina) otrzymano poli(tris-spiro-3,4-dioksabenzeno)cyklotrifosfazeny z zasadami Schiffa [PNSB1 -3]. PNCHO i pochodne policyklotrifosfazen-zasady Schiffa scharakteryzowano za pomocą analizy elementarnej (C, H, N), FTIR, 1 H, 13 C NMR. Metodą różnicowej kalorymetrii skaningowej (DSC) wykazano wysoką temperaturę zeszklenia (135−175°C) otrzymanych polimerów.…”

“…On the other hand, inorganic molecules, or polymeric materials with nitrogen and phosphorus atoms are generally nonflammable when they are subjected to tough burning conditions. Incorporation of these molecules either chemically bonded or physical blended to the industrial polymers, particularly in the construction, electronic and aviation industries are of great interest to avoid the generation of smokes, corrosive and super-toxic gases during fire accidents that causes great losses to society [12][13][14].…”

Facile fabrication of photoinduced superhydrophobic–superhydrophilic surfaces on cellulose substrate without strength loss

“…The silica sol was prepared via TEOS hydrolysis in SDBS emulsion. 28 Briefly, TEOS (12.0 g) and SDBS (0.8 g/L) were added to 200.0 g deionized water under magnetic stirring at room temperature for 1 h until an emulsion formed. A total of 6 mL of HCl (0.1 mol/L) was dropwise added into the emulsion.…”

“…The replacement of -OH groups by hydrophobic groups in silane coupling agents on the silica film was almost completed and no further dehydration or condensation occurred as the silane coupling agent was higher than 6%. 28 The cellulose substrate was modified with the FPHSs containing OTES and DTES, and then cured in UV light for different time. The water contact angle of the cured cellulose substrate was increased with the UV curing time in the first 35 s (Figure 6(c)).…”