Size Control of Block Polymer Templated Mesoporous Silicate Materials

2000 ◽  
Vol 628 ◽  
Author(s):  
Takeo Yamada ◽  
Keisuke Asai ◽  
Kenkichi Ishigure ◽  
Akira Endo ◽  
Hao S. Zhou ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Molecular Sieve ◽  
Mesoporous Material ◽  
Triblock Copolymer ◽  
Size Control ◽  
Block Polymer ◽  
New Class ◽  
Mesoporous Silicate ◽  
Cubic Structure ◽  
Silicate Materials

ABSTRACTMesoporous materials have attracted considerable interest because of applications in molecular sieve, catalyst, and adsorbent. It will be useful for new functional device if functional molecules can be incorporated into the pore of mesoporous material. However, it is necessary to synthesize new mesoporous materials with controlled large pore size. Recently, new class of mesoporous materials has been prepared using triblock copolymer as a template. In this paper, we reported that hexagonal and cubic structure silicate mesoporous materials can be synthesized through triblock copolymer templating, and their size was controlled by synthesis condition at condensation.

Ordered Mesoporous Silicate Materials from a Template of Triblock Copolymer (II): Synthesis of Film and Application for Gas Sensor

2001 ◽  
Vol 206-213 ◽  
pp. 1985-1988
Author(s):  
Hao Shen Zhou ◽  
Takeo Yamada ◽  
Keisuke Asai ◽  
Itaru Honma ◽  
H. Uchida ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Triblock Copolymer ◽  
Mesoporous Silicate ◽  
Ordered Mesoporous ◽  
Silicate Materials

scholarly journals Nanoparticle-enhanced chemo-immunotherapy to trigger robust antitumor immunity

2020 ◽  
Vol 6 (35) ◽  
pp. eabc3646 ◽  
Author(s):  
Jingjing Liang ◽  
Huifang Wang ◽  
Wenxiu Ding ◽  
Jianxiang Huang ◽  
Xuefei Zhou ◽  
...  
Keyword(s):  
Triblock Copolymer ◽  
Rational Design ◽  
Antitumor Immunity ◽  
Chemotherapeutic Agent ◽  
Therapeutic Benefit ◽  
Combination Regimen ◽  
Cross Presentation ◽  
New Class ◽  
Immunosuppressive Tumor Microenvironment ◽  
Novel Strategy

Mounting evidence suggests that immunotherapies are a promising new class of anticancer therapies. However, the immunosuppressive tumor microenvironment (TME), poor immunogenicity, and off-target toxicity hinder the broader implementation of immunotherapies. Here, we describe a novel strategy combining chemotherapy and immunotherapy to modulate the TME by systemically and concurrently delivering the chemotherapeutic agent SN38 (7-ethyl-10-hydroxycamptothecin) and the STING agonist DMXAA (5,6-dimethylxanthenone-4-acetic acid) into tumors using triblock copolymer nanoparticles, named PS3D1@DMXAA, which enhances antigen cross-presentation and induces the conversion of the immunosuppressive TME to immunogenic TME through the newly found synergistic function between SN38 and STING activation. PS3D1@DMXAA thus shows potent therapeutic efficacy in three mice tumor models and elicits remarkable therapeutic benefit when combined with anti–PD-1 therapy. Our engineered nanosystem offers a rational design of an effective immunotherapy combination regimen to convert uninflamed “cold” tumors into “hot” tumors, addressing the major challenges immunotherapies faced.

Electron Energy Loss Spectroscopy Study of ZSM-5 Zeolite and MCM-41 Mesoporous Materials

2001 ◽  
Vol 7 (S2) ◽  
pp. 1072-1073
Author(s):  
F. Paraguay D ◽  
M. Miki-Yoshida ◽  
F. Espinosa-Magaña ◽  
E. Terrés ◽  
J.M. Dominguez
Keyword(s):  
Long Range ◽  
Mesoporous Materials ◽  
Acid Sites ◽  
Range Order ◽  
Atomic Scale ◽  
Long Range Order ◽  
Channel Network ◽  
New Class ◽  
Small Pore ◽  
Electron Energy Loss

Zeolites are crystalline aluminosilicates possessing a regular microporous channel network. Unique properties of zeolites such as the presence of framework cations, acid sites, and their well-defined porous structure-with pore sizes similar to those of small molecules-account for their traditional utilization in ion exchange, catalysis, and separation. in addition, zeolites are being investigated for novel emerging applications in a diversity of areas including optoelectronic devices and reactive membranes because they provide for discrimination, recognition, and organization of molecules with a precision of less 1 Å. However, their applications are limited by the relatively small pore openings; therefore, pore enlargement was one of the main aspects in zeolite chemistry. A new class of porous materials, which contain large uniform spaces in the mesopore size regimen (15-100 Å), was reported. These so-called mesoporous materials have two different characters, disorder at the atomic scale but long range order at the atomic scale but long range order at the mesoscopic scale.

FTIR Spectroscopic Study of Titanium-Containing Mesoporous Silicate Materials

Langmuir ◽  
2005 ◽  
Vol 21 (23) ◽  
pp. 10545-10554 ◽  
Author(s):  
Natalia N. Trukhan ◽  
Alexander A. Panchenko ◽  
Emil Roduner ◽  
Maxim S. Mel'guno ◽  
Oxana A. Kholdeeva ◽  
...  
Keyword(s):  
Spectroscopic Study ◽  
Mesoporous Silicate ◽  
Silicate Materials

Mesoporous silicate materials as substrates for molecular machines and drug delivery

2008 ◽  
Vol 137 (1) ◽  
pp. 4-13 ◽  
Author(s):  
Sarah Angelos ◽  
Monty Liong ◽  
Eunshil Choi ◽  
Jeffrey I. Zink
Keyword(s):  
Drug Delivery ◽  
Molecular Machines ◽  
Mesoporous Silicate ◽  
Silicate Materials

Effect of Synthesis Duration on the Physicochemical Properties of Siliceous Mesoporous Molecular Sieve (Si-MMS)

2012 ◽  
Vol 326-328 ◽  
pp. 647-653 ◽  
Author(s):  
Anita Ramli ◽  
Sohail Ahmed ◽  
Suzana Yusup
Keyword(s):  
Physicochemical Properties ◽  
Pore Structure ◽  
Molecular Sieve ◽  
Mesoporous Material ◽  
Mesoporous Molecular Sieve ◽  
Diffraction Peaks ◽  
Adsorption Desorption ◽  
Synthesized Materials ◽  
Synthesis Duration ◽  
Mcm 41

Pure silica mesoporous molecular sieve (MMS) solid has been synthesized at 100°C by hydrothermal process. The effect of synthesis duration from 2 to 10 days has been investigated on the physicochemical properties of mesoporous molecular sieve. Samples were characterized by low angle XRD, N2adsorption-desorption and HRTEM analysis. XRD patterns of the as-synthesized samples showed four well-defined diffraction peaks corresponding to 100, 110, 200 and 210 planes. These peaks are the fingerprint characteristics of MCM-41 mesoporous material. The high intensity diffraction peaks were observed in 8-days sample that define the high ordering of the pores and long range order. N2adsorption-desorption results showed that all samples possessed a type IV isotherm having hysteresis loop of typeH1which is an identification of mesoporous material. Calcined samples exhibited high surface area i.e., 984-1036 m2g-1, pore volume i.e., 1.00-1.13 cm3g-1and average pore diameter i.e., 3.04-3.30 nm. A hexagonal pore structure was found in the synthesized materials by HRTEM analysis, which confirms that the synthesized materials are MCM-41. HRTEM analysis showed the effect of synthesis duration on the materials and found that 8-days sample exhibited highly ordered hexagonal pore structure like honeycomb structure. All the samples were calcined at 550°C to remove the template and to study the changes in the mesoporous framework. The results showed that the mesoporous structure remained intact after calcination at 550°C, indicating that the mesoporous materials exhibit high thermal stability.

A Novel Iron Silicate Mesoporous Material Synthesis and Its Characterization

2018 ◽  
Vol 24 (8) ◽  
pp. 5532-5536
Author(s):  
M. A Mary Thangam ◽  
Chellapandian Kannan
Keyword(s):  
Mesoporous Materials ◽  
Molecular Sieves ◽  
Mesoporous Material ◽  
Synthesis Method ◽  
Acid Sites ◽  
Mesoporous Molecular Sieves ◽  
Isomorphous Substitution ◽  
Main Role ◽  
Material Synthesis ◽  
Ft Ir

The mesoporous materials have variety of applications in several field particularly it has a main role in Catalysis, Petrochemical industries and Adsorption. Normally the porous material has well ordered 3Dimensional structure, huge surface area, high thermal stability and active acid sites. The properties of these materials can be varied because it is mostly depends on its template, synthesis method and isomorphous substitution of metal ions. There are two major mesoporous materials which are aluminosilicate and aluminophosphate. In this present investigation AlCl3 and FeCl3 are used in equal amount for the synthesis of mesoporous material. The synthesized material is characterized by FT-IR, XRD, TGA, BET, EDAX and TPD. Morphological images were studied by SEM. These characterization techniques confirm the formation of mesoporous molecular sieves.

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