Strict In-Plane Alignment Control of Block-Copolymer-Templated Mesostructured Silica Films Using an Alignment-Controlling Agent

Kubo, Wataru; Takahashi, Masahiko; Okamoto, Kohei; Kitamura, Shin Ya; Miyata, Hirokatsu

doi:10.1021/la401176j

Cited by 4 publications

(6 citation statements)

References 27 publications

(42 reference statements)

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“…Usually, silica membranes that are prepared by calcination of silica sol-coated films are rather hydrophobic. The results clearly indicate that the post-treatment of HMTES-containing membranes with water offers a new convenient method to increase the hydrophilicity of the silica membranes.Although homo-and copolymerization of HMTES giving the polymer gels have been studied, their utilities as separation membranes and post-hydrolysis of the polymers tuning the hydrophilicity have not yet been reported to our knowledge [27][28][29][30]. Chart 1.Chemical structures of alkoxysilanes investigated in this study.…”

Section: Introductionmentioning

confidence: 99%

Preparation of hydroxyl group containing bridged organosilica membranes for water desalination

Yamamoto

Ohshita

Mizumo

et al. 2015

Separation and Purification Technology

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Organosilica membranes were prepared by homo-and copolymerization of hydroxymethyl(triethoxy)silane (HMTES) for the first time, and applied to reverse osmosis (RO) to investigate the effects of the hydroxymethyl group. Fourier transform infrared (FT-IR) spectrometry, thermogravimetric analysis (TGA), and water contact angle measurements of the membrane surface indicated that the C-OH group of HMTES underwent a condensation reaction with Si-OH to form an Si-O-C bond during the calcination at 300 °C.Upon RO experiments usinganNaCl aqueous solution, the HMTES membrane exhibited a significant increase of the liquid permeance and a decrease of the NaCl rejection during the measurement, which arose from the hydrolytic cleavage of the Si-O-C bond to form Si-OH and C-OH groups upon contact with water.On the other hand, for a membrane derived from the copolymerization of HMTES and bis(triethoxysilyl)ethane (BTESE) in the weight ratio of 1:1, liquid permeance was increased gradually to reach a steady state of 3.4×10 -13 m 3 /(m 2 •s•Pa), and NaCl rejection was maintained at a

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Section: Introductionmentioning

confidence: 99%

Preparation of hydroxyl group containing bridged organosilica membranes for water desalination

Yamamoto

Ohshita

Mizumo

et al. 2015

Separation and Purification Technology

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“…35 However, in most of these methods, the evaporation-induced self-assembly process was not considered significantly. The process plays an important role in determining the structure of mesostructured silica films, and the relevant fundamental research of the process should contribute to the advancement of the methods described above.…”

Section: Introductionmentioning

confidence: 99%

“…Until now, a variety of techniques have been reported for the production of two-dimensional hexagonal mesoporous thin films with the desired mesopores. The methods can be categorized into four groups: (i) synthesis under external forces such as electric field, magnetic field, and air flow; (ii) surface treatment by photoinduced anisotropic polymer film and cubic mesoporous film and rubbing treatment; (iii) geometrical surface modification such as lithographically designed confined space; , and (iv) addition of alignment-controlling agents . However, in most of these methods, the evaporation-induced self-assembly process was not considered significantly.…”

Section: Introductionmentioning

confidence: 99%

“…The methods can be categorized into four groups: (i) synthesis under external forces such as electric field, 27 magnetic field, 28 and air flow; 29 (ii) surface treatment by photoinduced anisotropic polymer film 30 and cubic mesoporous film 31 and rubbing treatment; 32 (iii) geometrical surface modification such as lithographically designed confined space; 33,34 and (iv) addition of alignment-controlling agents. 35 However, in most of these methods, the evaporation-induced self-assembly process was not considered significantly. The process plays an important role in determining the structure of mesostructured silica films, and the relevant fundamental research of the process should contribute to the advancement of the methods described above.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Withdrawal Speed on Film Thickness and Hexagonal Pore-Array Dimensions of SBA-15 Mesoporous Silica Thin Film

et al. 2014

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Two-dimensional hexagonal mesoporous silica thin films of SBA-15 were synthesized on Si substrates via dip-coating using an evaporation-induced self-assembly process. The effect of the withdrawal speed on the thicknesses, one-dimensional pore alignments, and two-dimensional hexagonal pore arrays of the films was elucidated. Detailed analyses of FE-SEM and TEM images and XRD and XRR patterns of the synthesized thin films clarified that the pore sizes, interplanar spacings, and film thicknesses depend on the withdrawal speed. Furthermore, the same films were synthesized on Si substrates with microtrenches. The local flow of coating solutions around microtrenches affects the pore direction as well as the film thickness. In order to form well-ordered mesoporous silica thin films with large surface areas, it is important to control the synthetic conditions such as the local flow of the coating solutions as well as the physicochemical properties of the silica precursor solutions or template molecules.

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“…For instance, in the case of poly(ethylene oxide) (PEO)/poly(propylene oxide) (PPO) copolymers, it was shown that an overall BCP concentration of 60 to 70 wt% was necessary to obtain a hexagonal structure. 140 Variation of concentration or addition of NPs or nano-materials, 141,142 such as carbon nanotubes, 140 leads to a change in crystalline structure, typically resulting in spherical shapes at low concentrations and lamellar structures at high concentration, while increased temperature was shown to re-organize micelles from spherical to rod-like structure. 143 The incorporation of metal NPs may be performed either through direct mixing of metal NPs with a single BCP or a mixture of BCPs, 38 or by the in situ growth of metal NPs within the BCP macro-structure from metal precursors.…”

Section: Solid Phase Formingmentioning

confidence: 99%

The fabrication and surface functionalization of porous metal frameworks – a review

Dumée

Bao

et al. 2013

J. Mater. Chem. A

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Porous metal frameworks offer potentially useful applications for the aerospace, automotive and bio-medical industries. They can be used as electrodes, actuators, or as selective membrane films. The versatility of the physical features (pore size, pore depth, overall porosity and pore surface coverage) as well as the large range of surface chemistries for both metal oxides and pure noble metals offers scope to functionalise metal nano-particles and networks of nano-porous metal structures. As well as traditional routes to producing metal structures, such as metal sintering or foaming, novel high-throughput techniques have recently been investigated. Nanoparticle self-assembly, metal ion reduction and deposition as well as metal alloy de-alloying were identified as sustainable routes to produce large surface areas of such nano-porous metal frameworks. The main limitations of the current fabrication techniques include the difficulty to process stable and homogeneous arrays of nano-scale pores and the control of their morphology due to the high reactivity of nano-structured metal structures. This paper aims at critically reviewing the various fabrication techniques and surface functionalization routes used to produce advanced functional porous metal frameworks. The limitations and advantages of the different fabrication techniques will be discussed in light of the final material properties and targeted applications. Keywordsporous metal frameworks; porous metal fabrication routes; metal surface chemistry; application of metal frameworks; 3

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Strict In-Plane Alignment Control of Block-Copolymer-Templated Mesostructured Silica Films Using an Alignment-Controlling Agent

Cited by 4 publications

References 27 publications

Preparation of hydroxyl group containing bridged organosilica membranes for water desalination

Preparation of hydroxyl group containing bridged organosilica membranes for water desalination

Effect of Withdrawal Speed on Film Thickness and Hexagonal Pore-Array Dimensions of SBA-15 Mesoporous Silica Thin Film

The fabrication and surface functionalization of porous metal frameworks – a review

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