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17 protocols using hexamethylenetetramine

1

Synthesis of Graphene-Based Nanomaterials

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Sulfuric acid (H2SO4, 98%), hydrochloric acid (HCl, 37%), potassium nitrate (KNO3), potassium permanganate (KMnO4), hydrogen peroxide (H2O2, 30%), ethanol, zinc nitrate hexahydrate (Zn(NO3)2·6H2O), zinc acetate dihydrate (Zn(CH3COO)2)·2H2O, hexamethylenetetramine (C6H12N4), and copper nitrate trihydrate (Cu(NO3)2·3H2O) were purchased from the Sinopharm Chemical Reagent Co., Ltd. 1-Butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), hydroiodic acid (HI, 48%), and worm-like expanded graphite powder (50 mesh number) were purchased from Shanghai Aladdin Biochemical Technology Co. Ltd. Guanine (G), adenine (A), cytosine (C), uracil (U), ascorbic acid (AA), D(+)-glucose (Glu), uric acid (UA), and dopamine (DA) were purchased from the Macklin Co. Ltd. N-formylmethionyl-leucyl-phenyl-alanine (fMLP, ≥99.5%) was obtained from Sigma-Aldrich (United States). All chemicals and reagents are of analytical grade and used without any further purification.
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2

Synthesis of Zinc-Cobalt Nanostructures

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Zinc acetate dihydrate (Zn(CH3COO)2·2H2O) and anhydrous ethanol were purchased from Aladdin Biochemistry Technology Co., Ltd. (Shanghai, China). Cobalt nitrate hexahydrate (Co(NO3)2·6H2O), zinc nitrate hexahydrate (Zn(NO3)2·6H2O), and hexamethylenetetramine (HMTA) were provided by Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). The conductive silver paste was obtained from Guangzhou Techno Electronic Technology Co., Ltd. (Guangzhou, China). PDMS prepolymer and curing agent were purchased from Dow Corning Chemical Co., Ltd. (America). All chemicals were of analytical grade and used without further purification.
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3

Synthesis and Characterization of Zinc Oxide Nanofibers

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Absolute ethanol (C2H5OH, 99.7%), dimethylformamide (DMF, C3H7NO, 99.5%), zinc acetate dihydrate (Zn(CH3COOH)2·2H2O, 99%), hexamethylenetetramine (HMTA, 99%), zinc nitrate hexahydrate (Zn(NO3)2·6H2O, 99%) and polyvinylpyrrolidone (PVP, 99.5%, MW = 1,300,000) were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). These chemicals were of analytical grades and used without further purification. The electrospinning needle with a 0.33 mm inner diameter was purchased from Suzhou Lanbo Dispensing Needle Co., Ltd. (Suzhou, China).
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4

Adsorption and Catalysis Reagents Protocol

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All the chemicals in the experiments were of analytical reagent grade and used without further purification. Ammonium molybdate ((NH4)6Mo7O24·4H2O), hexamethylenetetramine (C6H12N4), active charcoal powder, cadmium nitrate tetrahydrate (Cd(NO3)2·4H2O), and Na2S, chloroplatinic acid hexahydrate (H2PtCl6·6H2O) were purchased from Sinopharm Chemical Reagent Co., Ltd, China.
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5

Synthesis and Characterization of Metal Nanoparticles

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Tetrachloroauric acid tetrahydrate (HAuCl4·4H2O), sodium citrate tribasic dihydrate (TSC, 99.0%), silver nitrate (AgNO3, 99.0%), hydrochloric acid (HCl, 36.0−38.0 wt%), L-ascorbic acid (AA, 99.0%), ammonia solution (NH3H2O, 25.0−28.0 wt%), hydrogen peroxide (H2O2, 30.0 wt%), hexamethylenetetramine (HMT, 99.5%), thioacetamide (TAA, 99%), and cadmium acetate (CH3COO)3Cd were purchased from Sinopharm Chemical Reagent Co. Ltd. (Shanghai, China). Sodium borohydride (NaBH4, 99%), hexadecyltrimethylammonium chloride (CTAC, 97%), hexadecyltrimethylammonium bromide (CTAB, 99.0%), sodium iodide (NaI, 99.5%), and potassium chloroplatinite (K2PtCl6, 99.5%) were purchased from Aladdin Reagent. The chemicals were not further purified and were used straight from the original packaging. Deionized (DI) water with a resistivity of 16.8 Ω·cm was used throughout the experiments.
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6

Synthesis and Characterization of Naphthol Compounds

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Naphthol (AR), hexamethylene tetramine (AR) and NH2NH2·H2O (AR) were purchased from Sinopharm Chemical Reagent Co., Ltd., Shanghai, China; acetic acid (AR) was purchased from Shanghai Tree of Science & Technology Co., Ltd., Shanghai, China; absolute ethyl alcohol (AR) and metal salt solutions were purchased from Tianjin kaitong chemical reagent Co., Ltd., Tianjin, China.
FT-IR spectrometer (NEXUS-670), Nicolay corporation, Phoenix, AZ, USA; Nuclear magnetic resonance (AV-400) spectrometer, Bruker, Karlsruhe, Germany; 970CRT fluorescence spectrophotometer, Shanghai Instrument Analysis Factory, Shanghai, China; vacuum drying oven (DZF-6020A), Shanghai Kuntian Company, Shanghai, China; electric thermostatic water bath (HWS-12), Shanghai Yiheng Company, Shanghai, China.
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7

Synthesis of Metal-Organic Compounds

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All chemicals utilized in this work, including zinc acetate (Zn(CH3COO)2•2H2O), ammonium fluoride (NH4F), aluminum nitrate (Al(NO3)3•9H2O), and hexamethylenetetramine (HMT), were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China) and were of analytical grade, which can be used without any purification.
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8

Synthesis of Transition Metal Complexes

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Hydrochloric acid (HCl), nickel nitrate hexahydrate (Ni(NO3)2·6H2O), triethanolamine (C6H15O3N, TEOA), sulfuric acid (H2SO4), cobalt nitrate hexahydrate (Co(NO3)2·6H2O), acetonitrile (CH3CN, MeCN), deuterium oxide (D2O), copper nitrate trihydrate (Cu(NO3)2·3H2O), hexamethylenetetramine (C6H12N4, HMTA), hydrogen peroxide (H2O2), iron nitrate nonahydrate (Fe(NO3)3·9H2O), potassium permanganate (KMnO4), trisodium citrate (C6H5O7Na3) and urea (CH4N2O) were supplied by Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Cis-Dichlorobis(2,2-bipyridine)ruthenium(II) ([Ru(bpy)2]Cl2) were purchased form Sigma-Aldrich Co., Ltd (Shanghai, China). All chemicals were analytical grade and used as received. Deionized (DI) water was obtained from local sources.
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9

Synthesis and Characterization of MAX Phase Materials

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LiF was purchased from Aladdin Reagents (Shanghai), 200 mesh MAX Ti3AlC2 was purchased from 11 technology co.,LTD, hydrochloric acid (HCl), Zinc nitrate hexahydrate (Zn(NO3)2), Hexamethylenetetramine (HMTA), potassium permanganate were purchased from Sinopharm Chemical Reagent Co. Ltd. (China), Rhodamine 6G (R6G), methylene blue (MB), acid blue (AB), crystal violet (CV) were purchased from MACKLIN. All chemicals were used as received without further purification. miRNA with sequence of UUUGUACUACACAAAAGUACUG (sense(5'-3')) was purchased from RIBOBIO co.,LTD.
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10

Synthesis of Copper Nanostructures

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Cu(ii) nitrate trihydrates (Cu(NO3)2·3H2O, ≥99%), l-ascorbic acid (≥99%), cetyltrimethylammonium bromide (CTAB, ≥99%), and hexamethylenetetramine (HMTA, ≥99%) were purchased from Sinopharm Chemical Reagent Co., Ltd. All chemicals were used as received without further purification. In a typical synthesis experiment,27 (link) Cu(NO3)2·3H2O (50 mg) and l-ascorbic acid (100 mg) were dissolved with 15 mL of deionized water in a glass vial (20 mL). After forming a homogeneous solution, CTAB (100 mg) and HMTA (100 mg) were added. After 30 min of stirring, the vial of the solution was capped and heated from room temperature to 80 °C and kept at 80 °C for 6 h in a water bath. The products were collected by centrifugation at 10 000 rpm and washed three times ethanol.
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