INTEGRATED FERROELECTRICS
·
2014
·
IF 0.371
Xue Lei,Bing Yu,Hai-Lin Cong,Chao Tian,Yue-Zhong Wang,Qian-Bin Wang,Chuan-Kuo Liu
Monodisperse silica microspheres have drawn much attention for having important applications in many areas. In this paper, a series of monodisperse silica (SiO2) microspheres was synthesized successfully using a modified Stöber method in which tetraethyl orthosilicate (TEOS) was continuously supplied into the reaction system by a syringe pump. By changing the supply rate of TEOS, the diameters of the obtained SiO2 microspheres were controlled very well from 1 μm to 3 μm. Detailed characterization of the silica particles was performed using scanning electron microscopy (SEM).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
He Dong,Yandong Han,Shiyong Teng,Yang Hu,Zilong Guo,Dayang Wang,Wensheng Yang
In this work, we demonstrate a new, facile approach for preparation of monodispersed, submicrometer silica particles via a tetrabutylammonium bromide (TBABr) assisted Stöber method. Sizes of the resulting silica particles increased from 0.39 to 1.08 μm with polydispersity lower than 5 % while the concentration of TBABr in the reaction media was elevated from 0 to 20.0 mM. The presence of TBABr molecules was able to effectively suppress the condensation rate of silanol monomers during the Stöber reaction, which, in turn, slowed the formation of silica seeds and thus accounted for growth of large silica particles. The use of tetraethylammonium bromide (TOABr), a quaternary ammonium agent with longer alkyl chains, instead of TBABr, yielded monodisperse silica particles more hydrophobic in character, making it feasible to tailor the surface properties of the as-prepared silica particles.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2017
·
IF 0.457
Shuai Zhang,Guo-Ling Li,Hai-Lin Cong,Bing Yu,Xing-Yu Gai
Monodispersed silica spheres were prepared by an effective method, which an ethanolic solution of tetraethyl orthosilicate (TEOS) was continuously supplied to the reaction mixture containing KCl electrolyte, water, TEOS, ethanol and ammonia. The particle size of the silica spheres ranged from 2.0 to 4.5 µm. In addition, the effects of reaction conditions such as temperature and amount of ammonia on microsphere morphology were studied.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Li Zhao,Zhiping Du,Xiumei Tai,Yanjun Ma
To achieve effective oil/water separation, one-step facile fabricated hydrophobic SiO2 coated super-hydrophobic/super-oleophilic mesh (FSSM) via an improved Stöber method. Apparent contact angle was characterized by a contact angle meter (CA). SEM, FTIR and XPS were used to characterize the surface morphology and chemical composition of FSSM, individually. The super-hydrophobicity of the membrane was conferred by the multistage rough structure and low surface energy substances produced by the hydrolysis and polycondensation reactions of TEOS , DTMS and TMODS. Meanwhile, the effect of the proportion for silane coupling agents DTMS and TMODS on the hydrophobicity from claiming stainless steel network surfaces was investigated. The results showed that when DTMS: TMODS = 1:9 (n: n), the maximum apparent contact angle of FSSM was 153.3°, while the apparent contact angle of oil was 0°. The C, O and Si elements on the surface of FSSM increased by approximately 21%, 9% and 20% respectively. The FSSM can efficiently separate different oil/water mixtures (about 96%). Furthermore, FSSM showed excellent anti-corrosion (pH from 0 to 14) and remarkable reusability (about 40 cycles) and durability (exposure test at atmosphere for 35 days). The advantages of easy manufacture, stability and low cost of FSSM make it expected to be widely used in the field of oil-water separation.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 11
·期 4
·831-842
·
IF 2.786
Fei Shian,Zhang Yaheng,Zhang Jie,Tang Zhiyong,Wu Qing
This study presents a robust and scalable method for synthesizing continuously the silica microspheres via the Stöber method. Owing to the superb mixing accessible with gas-liquid segmented flow in coiled microtube, satisfactory morphology and mono-dispersity of silica spheres was obtained. The continuous method was firstly optimized through investigating the effects of various operation parameters on the morphology, particle size, size distribution and chemical structure of silica spheres. Without the surfactant, the size of silica spheres was limited < 850 nm due to the partial blockage of microchannel when synthesizing larger silica spheres. The addition of surfactant migrated the clogging issue, enabling the reliable synthesis of microspheres with diameters over 1 μm within a four times shorter residence time (30 min). Moreover, the mono-dispersity of silica microspheres could be further improved by increasing the gas/liquid ratio in segmented flow due to the more intensified mixing in liquid segments, as verified in visual flow field investigation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanoelectronics and Optoelectronics
·
2021
·Vol. 16
·期 2
·208-212
·
IF 0.961
Liu Zhong-Peng,Song Si-Nan,Zhang Mu
Recently, superhydrophobic surface on various type of substrates have attracted much attentions in electronics field. In this work, the classic Stöber method was used to prepare spherical silica particles with different particle sizes by adding different amounts of electrolyte
(potassium chloride), giving rise to size distribution ranging from 300 nm to 2.55 yitm. Herein we constructed a micro-nano lotus-like structure in a facile way, achieving a superhydrophobic surface with using any Fluorine related chemicals. In the sense, the silica particles modified with
HMDS were sprayed to prepare hydrophobic surface with contact angle up to 152.96° by increasing the frequency of sprays.
研究领域:
材料科学
·
表面工程学
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2017
·
IF 0
Jian Hui Luo,Yuan Yang Li,Ping Mei Wang,Bi Bo Xia,Li Peng He,Bo Wen Yang,Bo Jiang
Nano-silica was prepared using tetraethylorthosilicate (TEOS) as precursor by sol-gel technology based on stÖber method. These silica nanoparticals were further modified with silane coupling agents, i.e., Hexadecyltrimethoxysilane (HDTMS), dimethoxydiphenylsilane (DMMPS), to introduce organic functional groups on the surface of SiO2 nanoparticles. The Fourier transform-infrared (FTIR) spectra indicated that these silane coupling agents were anchored on the surface of silica particles. And the obtained organic–inorganic hybrid SiO2 particles showed an improvement in hydrophobicity, which can effectively inhibit these silica particles from aggregating.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ou Hai,Jian Li,Mengkang Pei,Qiang Ren,Xiulan Wu
The construction of visible full-spectrum tunable afterglow luminescence is of great significance for long afterglow materials. Here we developed a new composite material whose afterglow were continuously tunable from blue to red light, we prepared CsPbI 3 quantum dots (QDs) by thermal injection method and added passivators to obtain relatively more stable QDs materials, the SDS-CsPbI 3 QDs after passivation treatment was more than twice the photoluminescent (PL) intensity of the original QDs after 10 days, which has a positive effect on the large-scale production and application of all-inorganic perovskite QDs. By uniformly distributing CsPbI 3 QDs on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS) by Stöber method, a color-tunable long-persistence luminescent material CsPbI 3 /SMS@SiO 2 was prepared, and the tunable afterglow glows from 465 nm to 700 nm was realized by optical conversion. In addition, the PL intensity of the composite material under ultraviolet light is increased by more than 50%, and it can remain stable for a long time; its high temperature resistance is also improved to 140 °C; and the luminous intensity after 10 days remains at a high level. This research also provides new ideas and methods for the development of multicolor long afterglow materials.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yang Hu,Chi Cao,Lin Zhang,Wensheng Yang
This study investigates the utilization of choline hydroxide as a cocatalyst in the Stöber method to synthesize silica particles with controlled microstructure. Under low ammonia concentration, we add a robust organic base choline hydroxide and systematically explore the influence of choline hydroxide concentration on the hydrolysis and condensation equilibrium of tetraethyl orthosilicate (TEOS). Through the rational control of the water content, we significantly enhance both the size range and polydispersity of the resulting silica particles. Taking advantage of the regulated microstructure induced by controlled hydrolysis and condensation catalyzed by choline hydroxide, we achieved silica particles with hollow structures through hot water etching, exhibiting significantly enhanced surface area. These findings demonstrate the versatility of choline hydroxide as a cocatalyst in tailoring the microstructure of silica particles. In addition, due to its reducing ability and biocompatibility, which are not shared by other reported catalysts, the use of choline hydroxide opens up opportunities for applications in catalysis, sensing, and drug delivery.
研究领域:
材料科学
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Ailing Bai,Hao Song,Gaoyin He,Qingsong Li,Chong Yang,Limei Tang,Yingmin Yu
Abtract Here, a simple and reproducible method for the preparation of a well-defined zirconia@silica core–shell nanostructure is described. We studied the morphology, size, and composition of prepared nanoparticles (NPs) by transmission electron microscopy , scanning electron microscopy, dynamic light scattering, Fourier transform infrared spectroscopy , X-ray diffraction, and energy-dispersive spectroscopy. ZrO 2 NPs were synthesized through a novel alcohol–water mixed system using ZrOCl 2 ·8H 2 O as the zirconium source under mild hydrothermal conditions (110–120 °C). These NPs were then used as the core for the deposition of a silica shell via a modified Stöber method, resulting in uniform core–shell ZrO 2 @SiO 2 composites with a tunable silica shell thickness and controllable core morphology. In addition, the effect of the agent polyvinylpyrrolidone (PVP) on the formation of the core–shell structure was investigated in detail. The results demonstrated the PVP played a critical role in stabilizing the NPs and enhancing the affinity between SiO 2 and ZrO 2 .
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
He Dong,Yandong Han,Wensheng Yang
Conventional Stöber method, in which ammonia is used to catalyze the hydrolysis/condensation of tetraethyl orthosilicate (TEOS), has been proven to be very powerful for preparation of different sized, spherical silica particles. In this work, a modified Stöber method was developed, in which tetrabutylammonium hydroxide (TBAOH) was used as a co-catalyst of ammonia, for preparation of silica particles fractal-like in shape. In this method, the hydrolysis/condensation of TEOS was promoted due to the stronger alkalinity of TBAOH than ammonia, profitable for the formation of loosely condensed silica networks less negatively charged. Meanwhile, incorporation of the positively charged tetrabutylammonium ion (TBA + ), generated by dissociation of TBAOH, into the negatively charged silica networks may further suppress the electrostatic repulsion among the silica particles along the reaction. As a result, growth of the silica particles in such modified Stöber method primary followed the aggregation-only model, allowing the growth of silica particles with different fractal dimensions ( d f ) by simply changing the concentration of TBAOH.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Guangrui Han,Lang Liu,Minyu Jia,Xuting Li,Linrui Hou,Changzhou Yuan
Recently, silicon has been considered one of the preferred materials for the anodes of next-generation high-energy-density Li-ion batteries due to its advantages of high specific capacity, low working voltage, and abundant reserves. However, the huge volume change and poor electrical conductivity of silicon anodes during the lithiation and de-lithiation process seriously affect their practical application. Herein, honeycomb porous silicon is synthesized by a modified Stöber method and magnesium thermal reduction, which avoids using toxic gases (such as silane) in the traditional preparation of commercial nano-silicon. Moreover, the honeycomb porous structure can effectively alleviate the volume expansion during the charge/discharge process and agglomeration behavior of nano-silicon. Therefore, thanks to its unique structural merits, the honeycomb porous silicon anode is endowed with a reversible specific capacity of 824.1 mA h g−1 after 100 cycles at 0.5 A g−1 and 679.2 mA h g−1 even at an ultrahigh current density of 1.0 A g−1 after an extended cycling period of 200 cycles, which is almost twice that of commercial nano-silicon. More importantly, this finding offers promising advancements in designing silicon anodes in energy storage.
研究领域:
材料科学
·
能源存储
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）