研究生经典文献汇报模板PPT(1).ppt

1、1,Literatures Review,Single-crystalline NiCo2 O4 nanoneedle arrays grown on conductive substrates as binder-free electrodes for high-performance supercapacitors (在导电基底上生长单晶钴酸镍纳米针阵列作为不含粘合剂的高性能超级电容器电极),2,Literature source,3,Contents,Introduction,1,2,Experimental section,1,Conclusions,2,3,4,Results and

2、 discussion,4,1. Introduction,介孔二氧化硅微球,介孔材,硅系 非硅系,结构,中空特性 介孔壁结构,六方相 （hexagonal）,MCM-41,立方相（cubic）的MCM-48,层状（lamellar） 稳定的MCM-50,层层自组装,过程复杂 粒径不均匀 壁厚难整改,层层自组装（layer-by-layer self-assembly，LBL）是上世纪90年代快速发展起来的一种简易、多功能的表面修饰方法。LBL最初利用带电基板（substrate）在带相反电荷中的交替沉积制备聚电解质自组装多层膜（polyelectrolyte self-assembled m

3、ultilayer）。,应用,药物传输 药物缓释,5,1. Introduction,本文献的方法,通过该法获得的二氧化硅微球显示出均匀的空心结构，具有可控的壁厚（25-95nm）。,单分散相的聚苯 乙烯（PS）微球,硬模板,空孔结构,CTAB（十六烷基 三甲基溴化铵）,结构导向剂,在壁上生成 介孔结构,中空二氧化硅微球 HSS（hollow silica spheres,6,Experimental section,2,7,2. Experimental section,采用不同表面电荷的单分散相聚苯乙烯微球作为模板。,2.1 HHS的制备,+2.0g的CTAB,50ml乙醇,+5ml的PS

4、悬浮液,混合液,8.5ml氨水 18ml的水,定量TEOS,搅拌24h,固体,550,干燥煅烧6h,HSS-x,Ps: 这里的x代表TEOS和PS悬浮液的体积比,2.2 HHS的吸附,+ 20mg的HSS,甲基蓝（MB） V=50ml C=50ppm,震荡,UV-vis,溶液,l=664nm,测定吸光度,+,8,2,3,Results and discussion,9,3. Results and discussion,Figure S1. FESEM images of PS spheres with (a) negative and (b) positive surface charges

5、.,负电荷,正电荷,800nm,260nm,3.1 采用带不同表面电荷的PS微球对合成HSS的影响,10,3. Results and discussion,Fig. 1. FESEM images of the HSS samples prepared with negatively charged (a, b) and positively charged PS spheres (c, d) as templates,11,3. Results and discussion,Fig.1 TEM image of the HSS samples (e, f) prepared with a

6、TEOS/PS ratio of 2.25.,内径=200nm,壁厚=60nm,壁孔径=3nm,12,3. Results and discussion,3.2 样品HSS-7.2的热重分析,Figure S2 TGA and DTG curves of sample HSS-7.2.,在较低温度（200400）的失重是由于CTAB的脱除 而在较高温度(400-650)的失重是由PS微球的燃烧导致的,13,Fig. 2. TEM images of the HSS samples prepared with TEOS/PS ratios of 0.6 (a), 2.25 (b), 3.6 (c

7、), and 7.2 (d).,3. Results and discussion,3.3 不同的TEOS和PS悬浮液的比例对HSS壁厚的影响,14,3. Results and discussion,Table S1. Textural properties of the silica hollow spheres prepared with different volume ratios of TEOS/PS suspension.,返回,15,3. Results and discussion,Figure S3. Particle size distribution of HSS sy

8、nthesized with different TEOS/PS ratio.,随着TEOS/PS的比例从0.6到7.2，HSS的壁厚几乎呈线性增长（25-90nm）,16,3.4 不同的TEOS/PS的比例合成的HSS样品的氮气吸脱附等温线,3. Results and discussion,H4型的 滞后回线,滞后回线,样品HSS-0.6没有H4型滞后回线可能与中孔的结构缺陷有关，这有利于氮气在较高压力的脱附。,Fig. 3(a). Nitrogen adsorption/desorption isotherms of the HSS samples prepared with TEOS/

9、PS ratios of 0.6 (a), 2.25 (b), 3.6 (c), and 7.2 (d).,17,3. Results and discussion,Fig.3(b) PSD curves (b) of the HSS samples prepared with TEOS/PS ratios of 0.6 (a), 2.25 (b), 3.6 (c), and 7.2 (d).,同样，表S1,一个在2.5nm的宽峰的BJH孔径分布曲线确认了孔缺陷的存在,返回,18,3. Results and discussion,3.5 甲基蓝在样品HSS-0.6和HSS-0.5的吸附动力学曲线,Fig. 4. Adsorption kinetics of MB on samples HSS-0.6 and HSS-2.25.,28mg/g,8.1mg/g,介孔径 图3b,19,Conclusions,4,20,4. conclusions,在PS微球模板和表面活性剂CTAB存在的情况下，通过溶胶-凝胶法 合成具有可控介孔厚壁的空心二氧化硅微球。,带负电荷的硅酸盐物质和带正电荷的PS微